sealing element for prosthetic heart valve

专利摘要:
The present invention relates to the implantable prosthetic valve which is radially collapsible for collapsed configuration and radially expandable for expanded configuration, which includes an annular frame having an inlet end, an outlet end and a longitudinal axis. A sheet structure is positioned within the frame and attached to it, and the sealing element is attached to the frame. The sealing element includes a first woven portion that extends circumferentially around the frame. The first woven portion includes a plurality of interwoven filaments. The sealing element further includes a second woven portion that extends circumferentially around the frame and away from the first woven portion along the longitudinal axis of the frame. At least a portion of the filaments exits the fabric of the first woven portion and forms loops that extend radially outwardly from the frame.
公开号:BR112020002459A2
申请号:R112020002459-7
申请日:2018-08-10
公开日:2020-07-28
发明作者:Tamir S. Levi；Giolnara Pinhas；Liraz Marom；Elena Sherman；Noam Mizrahi；Delfin Rafael Ruiz；Sandip Vasant Pawar
申请人:Edwards Lifesciences Corporation；
IPC主号:

专利说明:

[001] [001] The present invention relates to modalities of sealing elements for prosthetic heart valves and methods for making them. BACKGROUND
[002] [002] The heart can suffer from several valve diseases or malformations that result in significant malfunction of the heart and, finally, require the replacement of the native heart valve with an artificial valve. Procedures in which radially collapsible trans-catheter valves are percutaneously introduced into a compressed state in a catheter and expanded at the treatment site are gaining popularity, especially among patient populations for whom traditional surgical procedures have a high risk of morbidity or mortality.
[003] [003] It may be important to reduce or prevent blood leakage after the prosthetic valve after implantation. Thus, transcatheter heart valves generally include a sealing element, such as a paravalvular (paravalvar) leak skirt to reduce the amount of leakage after the prosthetic valve. However, differences between the diameter of the prosthetic valve and the native ring within which the valve is implanted, along with characteristics of a patient's particular anatomy, such as calcification, tissue prominences, recesses, folds, and similar, can make it difficult to achieve a seal between the prosthetic valve and the native ring. Therefore, there is a need for improved paravalvular sealing elements for prosthetic heart valves. SUMMARY
[004] [004] Certain disclosure modalities concern prosthetic valves that include various types of sealing elements. In a representative embodiment, an implantable prosthetic valve that is radially collapsible for a collapsed configuration and radially expandable for an expanded configuration comprises an annular frame with an inlet end, an outlet end and a longitudinal axis. A leaflet structure is positioned inside the frame and attached to it, and a sealing element is attached to the frame. The sealing element comprises a first woven portion which extends circumferentially around the frame. The first woven portion comprises a plurality of interlaced threads. The sealing element further comprises a second woven portion that extends circumferentially around the frame and away from the first woven portion along the longitudinal axis of the frame. At least a portion of the filaments comes out of the fabric of the first woven portion and forms loops that extend radially out of the frame.
[005] [005] In some modalities, the filaments that form the straps extend from and return to the first woven portion.
[006] [006] In some embodiments, the first woven portion comprises a first row of loops, and the second woven portion comprises a second row of loops. The handles of the second row of handles may comprise filaments that extend from and return to the second woven portion.
[007] [007] In some modalities, the handles of the second row of handles are circumferentially displaced from the handles of the first row of handles.
[008] [008] In some embodiments, the plurality of interwoven filaments of the first woven portion further comprises at least one first interwoven filament with a plurality of second filaments, and a portion of the at least one first filament forms the loops of the first portion woven.
[009] [009] In some embodiments, the sealing element further comprises an intermediate sealing portion between the first and second woven portions. The intermediate sealing portion comprises a plurality of second filaments, and a portion of the at least one first filament extends along the longitudinal axis of the frame between the first woven portion and the second woven portion, and is interlaced with the second filaments the intermediate seal portion.
[010] [010] In some embodiments, a portion of at least one first filament forms the loops of the second woven portion.
[011] [011] In some embodiments, the second filaments are warp threads and at least one first filament is a weft thread.
[012] [012] In some modalities, at least one of the warp and weft threads comprises textured threads.
[013] [013] In some embodiments, the warp and weft threads comprise fibers with a diameter from 1 μm to 20 μm to promote the formation of thrombi around the sealing element.
[014] [014] In some embodiments, the filaments that form the straps originate from the first woven portion and extend curved along the longitudinal axis of the frame to the second woven portion.
[015] [015] In some embodiments, the filaments that form the loops come out of a fabric of the first woven portion and are incorporated into a fabric of the second woven portion, so that the loops form a portion of floating yarn between the first and the second woven portions.
[016] [016] In some embodiments, the floating yarn portion comprises a first layer of loops and a second layer of loops radially outward from the first layer of loops.
[017] [017] In some embodiments, the sealing element comprises a first strip of fabric, a second strip of fabric and a third strip of fabric. A plurality of filaments forming the loops extend between the first strip of fabric and the second strip of fabric, and a plurality of filaments forming the loops extend between the second strip of fabric and the third strip of fabric. The sealing member is folded around the second strip of fabric, so that the first strip of fabric and the third strip of fabric are adjacent to each other to form the first woven portion, the filaments extending between the the first strip of fabric and the second strip of fabric form the first layer of loops, and the filaments that extend between the second strip of fabric and the third strip of fabric form the second layer of loops.
[018] [018] In some embodiments, the sealing element is attached to the frame so that the filaments that exit the fabric of the first woven portion form the handles when the frame is in the expanded configuration and are pulled straight when the frame is in the collapsed configuration.
[019] [019] In another representative embodiment, a method involves fitting any of the prosthetic valves here to a distal end portion of a delivery device, advancing the delivery device through a patient's vasculature into the heart, and expanding the prosthetic valve on a heart valve native to the heart, so that the prosthetic valve regulates blood flow through the native heart valve.
[020] [020] In another representative embodiment, a method of fabricating a sealing element for a prosthetic heart valve comprises weaving at least one weft thread together with a plurality of warp threads to form a first woven portion, tearing down at least a weft yarn from a fabric of the first woven portion and wrap the at least one weft yarn around a removable warp yarn. The removable warp yarn is removed from the first woven portion and at least one weft yarn is wrapped around the removable warp yarn, so that the at least one warp yarn extends over, and is not intertwined with, warp yarns. warp arranged between the first woven portion and the removable warp yarn. The method further comprises reincorporating at least one weft thread into the fabric of the first woven portion, so that at least one weft thread forms a loop that extends and returns to the first woven portion and removing the removable warp thread from the element seal to release the loop formed by at least one weft thread.
[021] [021] In some embodiments, before removing the removable warp thread, the method further comprises repeating the weaving, dropping, wrapping and re-incorporation, to form a plurality of loops around a circumference of the sealing element.
[022] [022] In some modalities, the method also comprises adjusting the plurality of handles in shape, so that the handles extend outwards from the sealing element.
[023] [023] In some embodiments, the method further comprises, before removing the removable warp thread, weaving at least one weft thread together with warp threads, so that at least one weft thread extends beyond the removable warp yarn and form a second woven portion away from the first woven portion. The method further comprises dropping at least one weft thread from a fabric of the second woven portion and wrapping at least one weft thread around a second removable warp yarn that is spaced away from the second woven portion. The at least one weft thread can be wrapped around the second removable warp thread, so that the at least one weft thread extends over, and is not intertwined with, warp threads arranged between the second woven portion and the second removable warp thread. The method may further comprise re-incorporating at least one weft thread into the weave of the second woven portion, so that the at least one weft thread forms a second loop that extends and returns to the second woven portion.
[024] [024] The foregoing and other objectives, characteristics, and advantages of the disclosed technology will become more evident from the detailed description that follows, which continues with reference to the accompanying figures. BRIEF DESCRIPTION OF THE DRAWINGS
[025] [025] FIG. 1 is a perspective view of a prosthetic heart valve, which includes a representative embodiment of a paravalvular leakage seal, which includes loop filaments.
[026] [026] FIG. 2 is a perspective view of the paravalvular leakage seal of FIG. 1.
[027] [027] FIG. 3 is a schematic illustration of a representative method of weaving the paravalvular leakage seal of FIG. 1.
[028] [028] FIG. 4 is a side elevation view illustrating a textured yarn and a fully stretched yarn.
[029] [029] FIG. 5 is a perspective view illustrating a prosthetic heart valve that includes another embodiment of a paravalvular leakage seal, which includes a woven portion and a plurality of filaments extending from the woven portion.
[030] [030] FIG. 6 is a schematic illustration of the paravalvular leakage seal of FIG. 5.
[031] [031] FIG. 7 is a perspective view of the prosthetic heart valve of FIG. 5, which includes another embodiment of the paravalvular leakage seal, which includes a plurality of woven portions arranged in a layered arrangement outside the valve.
[032] [032] FIG. 8 is a side elevation view of the prosthetic heart valve of FIG. 5, which includes another modality of paravalvular leakage seal, in which the woven portion extends in a zigzag pattern around the valve, parallel to the frame support members.
[033] [033] FIG. 9 is a perspective view of another embodiment of a prosthetic heart valve, which includes a paravalvular leakage seal, having a first woven portion, a second woven portion and a plurality of threads extending between the first and second woven portions for form handles.
[034] [034] FIG. 10 is a top plan view of a representative embodiment of the paravalvular leakage seal of FIG. 9.
[035] [035] FIG. 11 is a perspective view of the paravalvular leakage seal of FIG. 9 folded on itself, before fixing to the prosthetic valve.
[036] [036] FIG. 12A is a side elevation view of a portion of the prosthetic valve frame of FIG. 9 in an expanded configuration that illustrates the wires extending longitudinally from the paravalvular leakage seal curving out from the frame.
[037] [037] FIG. 12B is a side elevation view of the frame portion of FIG. 12A in a radially collapsed configuration illustrating the wires extending longitudinally from the paravalvular leakage seal pulled straight along a longitudinal axis of the valve.
[038] [038] FIG. 13 is a side elevation view illustrating a portion of the prosthetic valve frame of FIG. 9 with the first woven portion of the paravalvular leakage seal coupled to a first step of the frame supports and the second woven portion attached to a third step of the frame supports.
[039] [039] FIG. 14 is a side elevation view illustrating a portion of the prosthetic valve frame of FIG. 9 with the first woven portion of the paravalvular leakage seal coupled to a first step of the frame supports and the second woven portion coupled to a fourth step of the frame supports.
[040] [040] FIG. 15 is a side elevation view illustrating a portion of the prosthetic valve frame of FIG. 9 with the paravalvular leakage seal wound along the frame supports.
[041] [041] FIGS. 16A and 16B illustrate another embodiment of the paravalvular leakage seal of FIG. 9, in which the longitudinally extending wires extend at an angle between the first and the second woven portions of the seal.
[042] [042] FIG. 17 is a perspective view of the prosthetic heart valve of FIG. 9, which includes another form of paravalvular leakage sealing, which includes a single layer of wires that extend longitudinally.
[043] [043] FIG. 18 is a top plan view of a portion of the paravalvular leakage seal of FIG. 17.
[044] [044] FIG. 19 is a bottom plan view of the prosthetic heart valve of FIG. 17.
[045] [045] FIG. 20 is a perspective view of the prosthetic heart valve of FIG. 9, which includes another modality of a paravalvular leakage seal.
[046] [046] FIG. 21 is a perspective view of a representative embodiment of a dispensing apparatus.
[047] [047] FIGS. 22-25 illustrate several other types of sealing elements with wires that form loops that extend from the sealing elements.
[048] [048] FIG. 26 is a perspective view of a portion of a sealing element that includes a plurality of loops wrapped in a base skirt fabric, according to an embodiment.
[049] [049] FIG. 27 is a cross-sectional side elevation view of the sealing element of FIG. 26.
[050] [050] FIGS. 28-30 are perspective views that illustrate plush handle portions formed in sealing elements in various patterns.
[051] [051] FIG. 31 is a side elevation view of a prosthetic heart valve that includes a sealing member that comprises a plurality of strips of woven fabric that includes fringed portions, according to another embodiment.
[052] [052] FIG. 32 is a plan view of a sealing element for a prosthetic heart valve, which includes woven portions and portions of floating thread, according to another embodiment.
[053] [053] FIG. 33 is an enlarged view of a first woven portion of the sealing element of FIG. 32.
[054] [054] FIG. 34 is an enlarged view of a second woven portion of the sealing element of FIG. 32.
[055] [055] FIG. 35 is an enlarged view of a floating wire portion of the sealing element of FIG. 32 in a relaxed state.
[056] [056] FIG. 36 illustrates the floating yarn portion of FIG. 35 in a stretched state.
[057] [057] FIG. 37 is a plan view of the sealing element of FIG. 32 in a stretched state.
[058] [058] FIG. 38 is a perspective view illustrating an edge portion of the sealing element of FIG. 32.
[059] [059] FIGS. 39A-39J illustrate several examples of leno fabric patterns and leno weaving techniques. DETAILED DESCRIPTION
[060] [060] This disclosure relates to modalities of sealing elements for implantable prosthetic devices, such as prosthetic heart valves. Current inventors have surprisingly discovered that effective sealing can be accomplished by sealing elements that include a plurality of filaments, such as yarns and / or fibers, that extend from the sealing element and are configured to prime a biological level response. to promote thrombogenesis around the sealing element.
[061] [061] For example, the sealing elements described here can be configured as fabric skirts, which include portions woven from which filaments or threads extend, and which can contact and / or conform to the surrounding anatomy to enhance the skirt sealing properties. In certain configurations, the filaments are limited at both ends and form straps that extend radially out of the skirt. As used herein, the term "loop" refers to a closed or partially open curve formed by a thread or other filament. In some modalities, the strands that form the straps extend and return to the same portion of fabric as the skirt. In such configurations, the straps can be arranged in one or more rows that extend circumferentially around the skirt. In other configurations, the strands extend from one fabric portion to another spaced fabric portion, so that the straps are arranged circumferentially around the valve and are oriented along a longitudinal axis of the valve . In still other embodiments, the filaments are attached at one end, and have free ends that extend outwardly from the skirt.
[062] [062] In such configurations, the filaments can be configured to decrease retrograde blood flow after the valve. Features, such as the diameter, shape, surface texture, coatings, etc., of the filaments can induce thrombus formation around the filaments to improve the sealing properties of the skirt.
[063] [063] FIG. 1 illustrates an exemplary embodiment of a radially collapsible and expandable prosthetic valve 10 shown in its expanded implanted configuration. The prosthetic valve may include an annular stent or frame 12 and a leaflet structure 14 located within and coupled to the frame 12. The frame may have an inlet end portion 16 and an outlet end portion 18. The leaflet structure may comprise a plurality of leaflets 22 as three leaflets, arranged to collapse in a tricuspid arrangement similar to the aortic valve. Alternatively, the prosthetic valve can include two leaflets 22, configured to collapse in a bicuspid arrangement similar to the mitral valve, or more than three leaflets, depending on the specific application. The prosthetic valve 10 can define a longitudinal axis 24 that extends through the inlet end portion 16 and the outlet end portion 18.
[064] [064] Frame 12 can be made from any of several biocompatible materials, such as stainless steel or a nickel-titanium ("NiTi") alloy, for example, Nitinol. With reference to FIG. 1, the frame 12 can include a plurality of supports interconnected in trusses 26, arranged in a trellis-like pattern and forming a plurality of vertices 28 at the outlet flow end 18 of the prosthetic valve. The supports 26 can also form similar vertices at the flow inlet end 16 of the prosthetic valve (which are covered by a skirt 30 described in more detail below). The truss supports 26 are shown positioned diagonally, or displaced at an angle to the, and displaced radially from the longitudinal axis 24 of the prosthetic valve. In other implementations, the truss supports 26 can be moved by an amount different from that outlined in FIG. 1, or some or all of the truss supports 26 can be positioned parallel to the longitudinal axis of the prosthetic valve.
[065] [065] The truss supports 26 can be connected in an articulated way to each other. In the illustrated embodiment, for example, the end portions of the supports 26 that form the vertices 28 at the outlet end 18 and the inlet end 16 of the frame, can have a respective opening 32. The supports 26 can also be formed with openings 34 located between the opposite ends of the supports. The respective hinges can be formed at the vertices 28 and in the places where supports 26 overlap each other between the ends of the frame using fasteners 36, which can comprise rivets or pins that extend through the openings 32, 34. The hinges may allow brackets 26 to pivot relative to each other when frame 12 is expanded or contracted, such as during assembly, preparation, or implantation of the prosthetic valve
[066] [066] As illustrated in FIG. 1, the prosthetic valve 10 can include a sealing element configured as a skirt 30. The skirt 30 can be configured to establish a seal with the native tissue at the treatment site, to reduce or prevent paravalvular leaks. The skirt 30 can include a main body portion 38 arranged around an outer circumference of the frame 12. The skirt 30 can be attached to the frame by, for example, a plurality of sutures 41 that extend in a zigzag pattern. zag along the selected support members 26 between a first edge portion (for example, an input edge portion) 40 and a second edge portion (for example, an exit edge portion) 42 of the skirt
[067] [067] In the illustrated embodiment, skirt 30 may comprise a plurality of filaments that extend outwards configured as loops 44 (also referred to as loop filaments). The handles 44 can extend from an outer surface 46 of the main portion 38. In certain embodiments, the handles 44 can be arranged in rows or levels 48 that extend circumferentially around the frame 12 and are spaced one the other along the longitudinal axis 24. For example, in the illustrated embodiment, the handles 44 are arranged in three rows 48, with a first row 48A being adjacent to the inlet edge portion 40 of the skirt, and the rows 48B, 48C being located above the first row 48A along the longitudinal axis 24 of the valve. In other embodiments, skirt 30 may include more or less rows of handles, depending on the particular characteristics desired. For example, skirt 30 may include a single row of handles 44 (for example, adjacent to the entry end of the frame). or a plurality of rows of loops along substantially the entire dimension at skirt height 30.
[068] [068] In particular embodiments, skirt 30 may comprise a cloth material, such as woven or knitted fabric. FIG. 2 illustrates a portion of a representative embodiment of skirt 30 made from such fabric in more detail. The fabric can comprise a plurality of horizontally oriented first threads 50 in FIG. 2 and one or more second threads 52 vertically oriented in FIG. 2 and selectively intertwined with the first 50 threads on a loom. In certain configurations, the first yarns 50 may be warp yarns, which means that, during the weaving process, the yarns 50 are held by the loom, while the second yarns 52 are weft yarns, which are interlaced with the warp threads by a shuttle or weft transport mechanism during the weaving process. However, in other embodiments, the first threads 50 may be weft threads and the second threads 52 may be warp threads. In the illustrated configuration, the fabric comprises a single weft yarn 52, which is selectively interwoven with the warp yarns 50 to form loop filaments 44, although in other embodiments more than one weft yarn can be used .
[069] [069] FIG. 3 illustrates an example of a weave pattern that can be used to produce skirt 30. With reference to FIG. 3, a first portion 52A of the weft thread may extend over and under the warp threads in the fabric of the first edge portion 40 to the second edge portion 42. In the second edge portion 42, the weft thread 52 folds to behind and a second portion 52B of the weft thread extends above and below each of the warp threads in the fabric, in a direction towards the first edge portion 40, in the manner of a flat fabric. This can define a side edge of the fabric and prevent the fabric from coming apart when removed from the loom. In the first edge portion 40, the weft thread 52 can fold back again, such that a third portion 52C extends over and under the warp threads 50 of a first woven portion configured as a fully woven strip 54A of the fabric. In the illustrated configuration, the fabric may include four of these woven strips 54A-54 D spaced from one another between the first and second edge portions 40, 42 and which extend parallel to the warp yarns 50. The woven strips 54A-54D can be spaced by respective portions 55A-55C partially or semi-semituted (also referred to as intermediate seal portions). In the fully woven strips 54A-54D, each weft thread 52 can be incorporated into the fabric. In contrast, in the semi-finished portions 55A-55C, only a portion of the weft yarn passes is incorporated into the fabric. In certain examples, in the woven strips 54A-54 D, the warp and weft threads 50, 52 are woven together in a flat fabric (or other suitable weave). In other embodiments, skirt 30 need not include the woven portion 54D above the last row of loops 44, depending on the particular application.
[070] [070] Still with reference to FIG. 3, at an upper edge 56 of the woven strip 54 A, the portion 52C of the weft yarn may come out of the fabric (for example, the portion of yarn 52C is "dropped" from the fabric) and may extend or "float" above the warp yarns 50 of the half-portion 55A by a distance d1. In FIG. 3, portions of the weft yarn 52 which are embedded in the fabric are illustrated in solid lines and portions of the weft yarn 52 which are not incorporated in the fabric (such as portion 52C) are illustrated in broken lines. The 52C portion can then wrap around a removable warp yarn 50A (also called selvedge yarn), and a fourth 52D portion can extend back to the first edge portion 40 above the warp yarns and out of the fabric. . When the portion of weft yarn 52D reaches the woven strip 54A, the portion 52D can be re-incorporated into the fabric, so that the warp yarns of the woven strip 54A extend above and below the portion of weft yarn 52D.
[071] [071] In the first edge portion 40, the warp yarn 52 may bend back again, and a fifth portion 52E may extend towards the second edge portion 42. The fifth portion 52E may be incorporated into the fabric through from a semitemped portion at 55A and the woven strip 54B until it reaches an upper edge 58 of the woven strip 54B, at which point a sixth portion 52F may come off or be "dropped" from the fabric. The sixth portion 52F can extend or float above the warp threads 50 of the half-portion 55B by a distance d2 towards the second edge portion 42. The sixth portion 52F can then wrap around a removable warp thread 50B, and a seventh 52G portion of the weft thread may extend in a direction back to the first edge portion 40 outside the fabric.
[072] [072] When the seventh 52G portion reaches the top edge 58 of the woven strip 54B, the seventh 52G portion can be reincorporated into the fabric so that the warp threads of the woven strip 54B extend above and below the seventh 52G portion. When the seventh 52G portion reaches a lower edge portion 60 of the woven strip 54B, the weft yarn may fold back, and an eighth portion 52H may extend in one direction to the second edge portion 42. The eighth portion 52H may be incorporated into the fabric through the semi-finished portion 55B and the woven strip 54C until the eighth portion reaches a top edge position 62 of the woven strip 54C. At this point, a ninth portion 52I may come out of the fabric and extend a distance d3 over the warp yarns 50 from the half-portion 55C to the second edge portion 42. On the woven strip 54D, the ninth portion 52I may wrap around a removable warp yarn 50C, and a tenth portion of 52J weft yarn can extend back to the first edge portion 40 outside the fabric.
[073] [073] When the eleventh portion 52J reaches the upper edge 62 of the woven strip 54C, the weft thread can be reincorporated into the fabric so that an eleventh portion of the 52K weft thread extends back to the first edge portion 40 in the plot. When the 52k portion reaches the first edge portion 40, the weft thread can fold back and the previous pattern can be repeated over a length of the fabric (for example, to the right in FIG. 3). FIG. 3 illustrates two complete instances of the previous weaving pattern.
[074] [074] When the weave pattern has been repeated a selected number of times (for example, to produce a fabric with a length corresponding to the circumference of the prosthetic valve), the removable warp threads 50A-50C can be removed from the fabric . For example, in the embodiment illustrated in FIG. 3, the warp yarns 50A-50C can be pulled out of the fabric in the direction of the respective arrows 64A-64C. This can cause the portions of the weft thread 50 that are outside the weft to be released from the fabric, thus forming the loops 44. For example, when the removable warp thread 50A is removed from the fabric, the portions 52C and 52D of the weft yarn are released from the fabric and can form a loop filament 44A that extends from the woven strip 54A (for example, in the form of terrycloth). Similarly, remove the 50B warp yarn can release the portions of weft yarns, 52F and 52G such that they form a loop filament 44B extending from the woven strip 54B, and removing the warp yarn 50C can release the portions of weft yarns 52I and 52J such that they form a loop filament 44C extending from the woven strip 54C.
[075] [075] Thus, removing the warp threads 50A-50C results in a plurality of wound filaments 44 arranged in three rows 48A-48C that extend longitudinally along the skirt 30, as described above. FIG. 2 illustrates skirt 30 with the removable warp yarn 50A removed for purposes of illustration. Returning to FIG. 3, and with reference to the Cartesian axes x and y for reference, the lines 48A- 48C of handles 44 can be moved from one another in a direction along the y axis (for example, parallel to the longitudinal axis of the valve) by a distance equal to the length of the loops plus the width of the woven strip 54 from which the loops extend. For example, the first row 48A of loops 44 adjacent to the first edge portion 40 is offset from the second row 48B of loops by a distance equal to a width W of the woven strip 54A plus the distance d1, the length of the loops 44.
[076] [076] Meanwhile, although handles 44 are shown axially aligned in FIG. 1 for purposes of illustration, the handles 44 can also be moved away from each other in a direction along the x-axis (for example, circumferentially around the prosthetic valve, when the skirt 30 is attached to the valve). For example, in the embodiment shown in FIG. 3, a center or apex of loop 44B is spaced beyond a center or apex of loop 44A by a distance x1 corresponding to, for example, the distance along the x axis occupied by the 52D weft portions and 52E in the tissue. Thus, in the illustrated configuration, each loop 44 is moved from the next sequential loop 44 on neighboring rows in a direction along the x axis by the distance x1. Thus, handle 44A is moved from handle 44B by the distance x1 in the negative x direction, and handle 44C is moved from handle 44B by the distance x1 in the positive x direction. Handles 44 in the same row are offset from each other along the x-axis by a distance equal to 3x1.
[077] [077] In certain embodiments, when the fabric has been removed from the loom and the 50 A-50C removable warp threads have been removed from the fabric, the handles 44 can be shaped so that they extend out of the fabric plane (for example, transverse to the longitudinal axis of the valve and, therefore, to the direction of flow through the valve). For example, referring again to FIG. 1, the handles 44 can be adjusted so that they extend radially outwardly from the surface 46 of the skirt 30 at an angle when the skirt is attached to the frame.
[078] [078] In certain configurations, one or both warp and weft threads 50, 52 can also comprise textured threads. A representative example is illustrated in FIG. 4, which shows an exemplary textured yarn 70 and a fully drawn wire 80. Textured yarn 70 includes a plurality of constituent fibers 72 that have been crimped, wound, folded, rolled, etc., so that the fibers are not as tightly bundled like the fibers 82 of the fully drawn wire
[079] [079] For example, blood cells generally range in size from 2 μm to 15 μm. For example, the diameter of red blood cells typically ranges from 6 μm to 8 μm, and the diameter of platelets generally ranges from 2 μm to 3 μm. Thus, using fibers 72 with a diameter sized to approximately correspond to the diameter of blood cells (for example, 1 µm to 20 µm) can promote the interaction between fibers and blood cells at the cellular level. For example, the fibers 72 can be configured to promote thrombus formation along the skirt 30, and along the loop filaments 44 in particular, thereby improving the skirt sealing characteristics.
[080] [080] In certain configurations, warp and weft yarns can comprise a variety of biocompatible materials, such as natural fibers (for example, silk, cotton, etc.), synthetic polymeric materials (for example, polyethylene terephthalate (PET) , nylon, polytetrafluoroethylene (PTFE) etc.) or metals (eg Nitinol, gold etc.). In other embodiments, the skirt 30 does not need to comprise a fabric, but it can comprise a thin film or polymeric laminate with which the loop filaments are integrally formed or to which the loop filaments are attached.
[081] [081] Skirt 30 can provide a number of significant advantages over known skirt modalities. For example, loops 44 can obstruct blood flow after the valve, reducing the speed and volume of blood that leaks through the valve after implantation. The obstruction of flow provided by the handles 44 can increase the time the blood remains near the skirt. This, together with the diameters of the fibers described above, can induce thrombus formation and promote a seal between the skirt and the surrounding fabric.
[082] [082] In addition, handles 44 can be flexible, allowing the handles to fit the shape of the surrounding anatomy. Since the handles 44 extend radially outwardly from the surface of the skirt 30, the free end portions of the handles may also extend into folds and slits in the surrounding anatomy to provide a more complete seal. In addition, when the prosthetic valve is implanted in the native aortic valve, blood around the outside of the valve may apply force to the loops 44 during ventricular diastole, in a direction that is opposite to the direction of blood flow through the valve. . This can improve the folding of the handles 44 away from the skirt 30, further improving the sealing properties. In addition, by extending outward from the valve, handles 44 can also prevent thrombi from moving beyond the valve, reducing the likelihood of stroke.
[083] [083] FIG. 5 illustrates a prosthetic valve 10 which includes another model of a sealing element or skirt 100. In the illustrated embodiment, skirt 100 may comprise a portion of fabric configured as a strip of fabric 102, and a marginal portion 104 that comprises a plurality of filaments configured as yarns 106 that extend from an edge portion 108 of fabric strip 102. In certain examples, yarns 106 may be warp yarns that extend from the weft of the strip of fabric 102 that are not intertwined with any weft yarn, or vice versa. In some embodiments, the strands 106 may be frayed strands. For example, yarns 106 may comprise a plurality of fibers or filaments spun together.
[084] [084] FIG. 6 schematically illustrates a portion of that skirt 100 in more detail. In the configuration illustrated in FIG. 6, the strands 106 can be frayed so that the constituent fibers 110 of the strands are separated from each other and form fan-like structures 112. For example, in some embodiments, the fibers 110 of the strands 106 may have diameters of 1 μm to 20 μm, a size in which the electrostatic forces between the fibers can dominate the gravitational forces, causing the fibers to separate. This can increase the surface area of the threads 106 which can promote a biological response at the cellular level between the blood and the fibers 110 of the skirt, as described above in relation to the embodiment of FIG. 1. Thus, the fibers 110 can be configured to promote the formation of thrombi along the fringe portion 104, thereby improving the sealing characteristics of the skirt 100.
[085] [085] In certain embodiments, yarns 106 may comprise any of a variety of hydrophobic surface treatments or coatings to promote separation of fibers 110 and increase the surface area of the fringed portion 104. In others modalities, yarns 106 may comprise hydrophilic surface treatments, such as polyethylene glycol (PEG) or other coatings that covalently bond to fibers. Yarns 106 may also comprise coatings or treatments to promote a biological response (for example, thrombus formation) from blood in contact.
[086] [086] With reference to FIG. 7, in another configuration, skirt 100 may comprise multiple woven strips 102 arranged on top of one another in a layered arrangement. For example, in the illustrated embodiment, skirt 100 may comprise three woven strips 102 A-102C arranged so that the fringed edge portion 108 of each strip is oriented towards the outlet end 18 of the frame. Although the illustrated embodiment includes three strips of fabric 102 A-102C, skirt 100 may comprise any appropriate number of strips of fabric 102, depending on, for example, the width of the fabric strips, the length of the prosthetic valve , etc. In other embodiments, both longitudinal edges of the fabric strips 102 may comprise threads 106.
[087] [087] In another configuration illustrated in FIG. 8, skirt 100 can be attached to supports 26 so that it extends along the supports and forms a zigzag shape. Multiple skirts 100 can be attached to the support members 26 of the frame in this manner, depending on the specific application.
[088] [088] FIG. 9 illustrates another embodiment of a prosthetic valve 200 configured as the SAPIEN ® 3 prosthetic heart valve by Edwards Lifesciences Corporation described in detail in U.S. Patent No. 9,393,110. The prosthetic valve 200 includes a radially expandable and collapsible frame 202 formed by a plurality of angled support members 204 and having an inlet end 206 and an outlet end 208. Although not shown, prosthetic valve 200 can also include a leaflet structure comprising two leaflets, three leaflets, or any other suitable number of leaflets located within and attached to the frame, as described in US Patent No. 9,393,110.
[089] [089] The prosthetic valve 200 may comprise an inner skirt 211 attached to an inner surface of the frame and an external window element configured as a skirt 212 arranged around the exterior of the frame 202. In the illustrated configuration, skirt 212 can comprise a first circumferential extension portion 214 located adjacent the entrance end 206 of the frame and a second circumferential extension portion 216. The circumferential portions 214, 216 may be spaced apart from each other along a longitudinal axis 218 of the frame and coupled together by a plurality of filaments 220. Filaments 220 can extend longitudinally along the outside of the frame between portions 214, 216, and can bend out from the frame when the frame is in the configuration expanded to form handles. The loop filaments 220 can be configured to provide a seal by obstructing the blood flow after the skirt and increasing the residence time of blood in the vicinity of the filaments, as described above.
[090] [090] In certain configurations, the circumferential portions 214, 216 can be configured as one or more strips of woven fabric. Filaments 220 can be yarns which are incorporated into the fabric of portions 214 and 216, and extend axially between them. The skirt 212 shown in FIG. 9 includes a single layer of loop filaments 220 for ease of illustration, although the skirt arrangements described here may include two or more layers of loop filaments, depending on the number of strips of fabric incorporated into portions 214, 216. Increasing the amount of loop filaments (for example, increasing the number of strips of fabric) can increase the total surface area of the sealing element available for thrombogenesis.
[091] [091] For example, FIG. 10 illustrates a representative embodiment of a skirt 212 configured to provide two layers of filaments in handle 220, when attached to the frame, and placed flat, for illustration purposes. The skirt 212 may comprise a main body 224 that includes a first strip of fabric 226A, a second strip of fabric 226B and a third strip of fabric 226C. The fabric strip 226B can be located between the fabric strips 226A and 226C. The fabric strip 226B can be separated from the fabric strip 226A by a portion of floating yarn 228A comprising a plurality of filaments or yarns
[092] [092] In the illustrated configuration, the first strip of fabric 226A may comprise weft and warp threads woven together. In an edge portion 230 of the fabric strip 226A, the yarns 220 may come out of the fabric and extend or "float" to the second fabric strip 226B to form the floating yarn portion 228A. When the floating yarns 220 reach the second fabric strip 226B, the yarns can be re-incorporated into the fabric of the fabric strip 226B. In an edge portion 232 of a fabric strip 226B, the threads 220 may come out of the fabric again and extend or float from strip 226B to strip 226C to form the floating thread portion 228B. When the floating threads 220 reach the fabric strip 226C, they can be re-incorporated into the fabric of the fabric strip 226C. In certain configurations, yarns 220 are warp yarns, although yarns 220 may also be weft yarns or a combination of warp and weft yarns, depending on the specific application.
[093] [093] With reference to FIG. 11, the main body 224 of the skirt 212 can be folded over the fabric strip 226B so that the fabric strip 226C is adjacent to the fabric strip 226A, and such that the floating yarn portions 228a and 228b are overlapped or coextensive with each other. The folded skirt 212 can then be attached to the frame (for example, by suturing) so that the fabric strips 226A, 226C form the first portion 214, and the fabric strip 226B forms the second portion 216. In this way, longitudinally extending yarns 220 of the floating yarn portion 228A form a first or layer radially into curved yarns or loops, and longitudinally extending yarns 220 of the floating yarn portion 228B form a second or layer radially out of curved wires or loops (or vice versa). To produce the single loop filament layer 220 shown in FIG. 9, skirt 212 need only include, for example, fabric strips 226A and 226B and floating yarn portion 228A.
[094] [094] With reference to FIGS. 12A and 12B, which illustrate a portion of the frame 202, the support members 204 can be arranged end to end to form a plurality of rows or steps of support members extending circumferentially around the frame 202. For example, frame 202 may comprise a first or lower row I of angled support members forming the entry end 206 of the frame; a second row II of support members above the first row; a third row III of support members above the second row; a fourth row IV of support members above the third row and a fifth row V of support members above the fourth row and which form the outlet end 208 of the frame. The structure and characteristics of the I-V rows of support members 204 are described in more detail in US Patent No. 9,393,110. The support members 204 of the frame 202 can also be grouped in columns. For example, frame 202 may include a plurality of first or "type A" columns and second or "type B" columns, alternately arranged around the circumference of the frame. In the illustrated configuration, type A columns comprise the support members 204 on the left side of the diamond-shaped windows 205 defined by rows IV and V of support members, and the support members that extend downwards from so. Type B columns comprise the support members 204 on the right side of the windows 205 and the support members extending downwards from there.
[095] [095] With reference to FIGS. 9 and 12A, the first portion 214 of skirt 212 can be attached (for example, by suturing) to the first row I of support members 204 adjacent the outlet end of the frame. The second portion 216 can be fixed along the intersection of the second and third rows II and III of supports 204. A length of the wires 220 can be configured so that the wires bend radially outwardly from the surface of the frame 202 when the frame is in the expanded configuration and forms handles. For example, when coupled to the frame, skirt 30 may have a length L corresponding approximately to the sum of the lengths of the support members 204A, 204B and 204C identified in FIG. 12A. In this way, when the frame 202 is in the radially compressed or furrowed configuration (in which the support members 204A, 204B and 204C are axially aligned or nearly aligned with each other), the wires 220 can be pulled straight to reduce the pleated profile of the valve for insertion into a distribution sheath.
[096] [096] In the configuration illustrated in FIGS. 9-12B, portions 214, 216 of skirt 212 extend generally parallel to one another and are not angled with respect to longitudinal axis 218 of the frame. In other configurations, one or both portions 214, 216 can be attached to the frame, such that they are angled with respect to the longitudinal axis 218 of the frame. For example, FIG. 13 illustrates a configuration in which the portion 214 is attached to the first row I of support members, so that the portion 214 extends parallel to the angled support members 204 around the circumference of the frame 202. In other words , the portion 214 forms a zigzag pattern along the first row I of support components 204, which corresponds to the zigzag pattern of the support components of the first row I. The portion 216 is fixed to the third row III of support members 204 and also extends parallel to the angled support members of the third row III.
[097] [097] In embodiments in which the portions 214, 216 of the skirt 212 extend parallel to the support members 204 of the respective row to which they are attached, the skirt 212 can extend between numbered rows pairs of support members, rows odd numbered support members, or odd numbered row for an even numbered row or vice versa. For example, in the configuration illustrated in FIG. 13, the first portion 214 is attached to the first row I and the second portion 216 is attached to the third row III, so that the skirt extends between two odd numbered rows of support members. With respect to the frame 202 illustrated in FIGS. 9 to 15, where the skirt extends from an odd numbered row to another odd numbered row (for example, from row I to row III) or from an even numbered row to another even numbered row (for example, from the row II for row IV), the portions 214, 216 can be arranged so that the wires 220 extend in a direction parallel to the longitudinal axis 218 of the frame. Stated differently, where skirt 212 extends between odd numbered rows or even even numbered rows, a given wire 220 may extend from a location along the first portion 214 that is attached to a type A column to a location along the second portion 216 which is also attached to a type A column.
[098] [098] In configurations in which the skirt extends from an odd numbered row to an even numbered row (or vice versa), portions 214, 216 can be displaced circumferentially from one another, so that the wires 220 extend in an angle to the longitudinal axis 218. For example, with reference to FIG. 14, the first portion 214 is coupled to the first row I of support members and the second portion 216 is coupled to the fourth row IV of support members. As illustrated in FIG. 14, the first and second portions 214, 216 of the skirt are displaced from each other at the circumference of the frame, so that a given thread 220 extending from a location along the first portion 214 which is attached to a column type A of support members is coupled to a location along the second portion 216 which is attached to a type B column of support members. This allows wires 220 to extend parallel to the longitudinal axis of the frame when the frame is furrowed.
[099] [099] FIG. 15 illustrates another configuration in which skirt 212 is wrapped between intersections or vertices 234 of frame members 204, so that portions 214, 216 hang from the frame
[0100] [0100] In certain examples, skirt 212 may comprise twisted yarn or untwisted yarn. The skirt 212 may also comprise core-spun yarns, wherein the surrounding fibers are spun around a core yarn. The surrounding fibers can be thin or diffuse, to increase the surface area of the core-spun yarn to promote a biological response, as described above. In certain embodiments, skirt 212 may also include handles similar to handles 44 of FIG. 1, in addition to the floating wire portions 228.
[0101] [0101] Figures 16 A and 16B illustrate another skirt 212 in which the threads 220 extend between strips of fabric 226A, 226B and 226C at an angle. For example, referring to FIG. 16A, the threads 220 of the floating yarn portion 228A extend at an angle to the fabric strips 226A and 226B. The yarns 220 of the floating yarn portion 228B may also extend at an angle to the strips of fabric 226B and 226C. In this way, when the main body 224 is folded, the wires 220 of the floating wire portion 228A can be angled or crossed with the wires of the floating wire portion 228B to form a mesh or screen, as shown in FIG . 16B. In some embodiments, the wires can extend at an angle of from 10 degrees to 40 degrees. In certain configurations having the wires from the floating wire portions 228A and 228B crossing each other at an angle can reduce the potential for spaces between the wires that result from bundling wires together. In some embodiments, the wires of the floating wire portion 228A and the floating wire portion 228B can be parallel to each other.
[0102] [0102] FIG. 17 illustrates the prosthetic valve 200 and the frame 202 of FIG. 9, which includes another embodiment of a skirt 300. The skirt 300 may comprise first and second portions 302, 304 of circumferential length apart from one another and coupled together by a plurality of filaments configured as longitudinally extending yarns 306 along the frame, similar to skirt 212. In the embodiment illustrated in FIG. 17, portions 302, 304 can be relatively wider than portions 214, 216 of skirt 212, so that the edge portions of portions 302, 304 curve outwardly from frame 202 in the expanded configuration, along with the filaments 306. The second portion 304 may also include a plurality of connecting portions 308 extending upward (for example, toward the outlet end 208 of the frame) from portion 304 and attached to supports 204 (for example, suture).
[0103] [0103] In the illustrated configuration, skirt 300 includes a single layer of longitudinally extending yarns 306. FIG. 18 illustrates a representative configuration of the skirt 300 placed flat before the skirt is attached to the frame. The first and second portions 302, 304 can comprise strips of woven cloth, similar to skirt 212. The portions of fabric 302, 304 can be spaced by a portion of floating yarn 310 through which yarns 306 extend. In some instances, the yarns 306 may be warp yarns and the floating yarn portion 310 may be formed by omitting the weft yarns from the floating yarn portion or by removing selected weft yarns from the fabric.
[0104] [0104] When the skirt 300 is attached to the frame, the first portion 302 can be folded around the inlet end portion 206 of the frame 202, so that the first portion is partially arranged within the frame. After implantation, blood can flow through the floating wire portion 310 and drain from the skirt. In certain configurations, the skirt 300 may have a reduced pucker profile because the skirt is not folded before being attached to the frame. In other configurations, the portions 302, 304 can be dimensioned so that the floating wire portion 310 is located in a lower or distal aspect of the skirt when the frame is expanded. For example, FIG. 19 is a perspective view of the distal or inlet end portion of frame 202 illustrating wires 306 located distally from the inlet end portion 206.
[0105] [0105] FIG. 20 illustrates another configuration of skirt 212 in which yarns 220 are configured to curl along or around portions 214, 216, before being reincorporated into the fabric. For example, referring to FIGS. 10 and 20, skirt 212 can be attached to the frame so that the threads 220 extend from the distal edge portion of the fabric strip 226A, fold back and extend proximally and over the fabric strip 226B to the proximal edge portion of strip 226B, so that the threads form a C-shaped arc. In other embodiments, one or both strips of fabric 226A, 226B can be omitted and threads 220 can be attached to the frame being wound through the support members 204.
[0106] [0106] The disclosed prosthetic valve modalities can be collapsed radially and delivered percutaneously to the heart using any of a variety of catheter-based delivery systems. For example, FIG. 21 shows a representative example of a dispensing assembly 400 configured for use with the prosthetic valve 10 of FIGS. 1-8 and described in detail in US Publication 2018/0153689. Delivery set 400 may include a handle 402, an elongated shaft 404 extending distally from handle 402, and a plurality of actuating members 406 (for example, in the form of positioning tubes) that extend through the shaft and distally outwardly from a distal end 408 of shaft 404. The actuating members 406 can be coupled to select vertices of the valve frame 12.
[0107] [0107] Initially, the prosthetic valve 10 may be in a configuration collapsed radially within a sheath 410 of the 404 axis. When the distal end of the delivery device is advanced through the patient's vasculature to the treatment site, the valve prosthetic 10 can be advanced from sheath 410 using a rotary actuator 412 on handle 402. Prosthetic valve 10 can then be positioned at the treatment site, expanded, and implanted using a release set generally indicated in 414. Other delivery systems that can be used in combination with the prosthetic valve modalities described herein can be found in US Patent Application Publication No. 2017/0065415 and in US Patent Application Publication. 2013/0030519.
[0108] [0108] FIGS. 22-25 illustrate additional modalities of fabric sealing elements that include a plurality of yarns or fibers that extend from the sealing elements to form loops in the manner of a loop pile to increase the surface area. available for thrombogenesis and tissue growth. For example, FIG. 22 schematically illustrates a portion of a sealing member 500 that includes a plurality of first threads 502 interlaced with a plurality of second threads 504. In certain embodiments, the first threads 502 can be warp threads and the second threads 504 they can be weft yarns, or vice versa. The warp yarns 502 can be configured to form handles 506 that extend outward from the page plane, and extend along one or more weft threads 504. For example, in the embodiment of FIG. 22, the sealing member may comprise warp yarns 502A and warp yarns 502B. Warp yarns 502A can form loops 506, while one or more warp yarns 502B can be interposed between warp yarns 502A. For example, in the illustrated embodiment, there are two warp threads 502B between the two warp threads 502A, although there may be any number of warp threads 502B depending, for example, on the desired spacing between the handles 506.
[0109] [0109] Warp yarns 502A can also change direction where they form loops 506. For example, in the embodiment of FIG.
[0110] [0110] In certain embodiments, the 506 loops can be formed using warp knitting techniques. In certain examples, the first 502A warp yarns may comprise textured, denier 20, filament 18 (20d / 18f) and / or 30d / 18f yarns. The second 502B warp yarn may comprise 20d / 18f yarns twisted at 12 twists per inch (tpi). In certain examples, weft threads 504 can be 20d / 18f with 12 tpi. The warp and weft yarns can be made from any of several biocompatible polymers, such as PET, UH-MWPE, PTFE, etc. In other embodiments, the warp and / or weft yarns can have any denier selected and / or filament count and can be made from any suitable natural or synthetic material.
[0111] [0111] In some modalities, the handles can be formed over a skirt of the prosthetic valve by means of embroidery. In a representative embroidery technique, a thread or filament is sewn into, or through, a base or foundation layer (for example, a fabric), which allows a variety of shapes or patterns to be produced on the surface of the foundation layer. FIG. 26 illustrates a portion of a skirt 600 that includes a plurality of straps 602 embroidered on a base skirt fabric 604, according to one embodiment. The base skirt fabric can comprise a plurality of first threads 610 intertwined with a plurality of second threads 612 in, for example, a flat fabric. Referring to FIG. 27, loops 602 can be formed using a third thread configured as an embroidery thread 606, which can be a thread or suture of relatively high density. In certain embodiments, in addition to the first or foundation layer 604, skirt 600 may also optionally include a second layer configured as a blocking layer 608. In particular embodiments, blocking layer 608 may comprise a light yarn of relatively high density. low, and / or thin or suture that can be used to block the embroidery thread 606 at the back of the foundation layer 604.
[0112] [0112] As noted above, the handles can be embroidered on the surface of the prosthetic valve skirt, with any specified location, length, width, spacing, shape and / or pattern. FIGS 28-30 illustrate only a few examples of patterns that can be produced using the embroidery technique described above. For example, FIG. 28 illustrates a prosthetic valve skirt 700 that includes a plurality of loops generally indicated at 702 embroidered on the skirt and forming a plush portion or stack 706. The plush portion 706 may include a plurality of angled portions 712 that circumferentially extend around skirt 700 in a zigzag pattern from an end portion 708 (e.g., an inlet end portion) of the skirt to half the height of the skirt. FIG. 29 illustrates another variation of the plush portion 706, in which the plush portion defines cells 710. In certain embodiments, cells 710 may correspond to openings or cells defined by the frame holders, such as the holders 26 of the pro valve - technique 10 of FIG. 1. In other embodiments, the cells of plush portion 706 may correspond to the size and shape of the frame openings defined by the frame holders 202 of FIG. 9. FIG. 30 illustrates another variation of the plush portion 706, which includes straight portions 714 that extend between adjacent angled portions 712. In certain embodiments, the handles 44 of FIG. 1 can be formed on the underlying fabric of the skirt 30 by means of embroidery.
[0113] [0113] FIG. 31 illustrates a prosthetic heart valve 800 that includes another embodiment of a sealing element or skirt 802 on a frame 804 configured as the prosthetic heart valve frame SAPIEN ® 3 from Edwards Lifesciences Corporation. The skirt 802 may comprise a plurality of fabric portions configured as fabric strips 806 which extend circumferentially around the frame. Each of the strips of fabric 806 may comprise a corresponding fringe portion 808 that comprises a plurality of filaments 810 extending radially outwardly at an angle from a circumferential edge portion (e.g., an edge portion inlet or outlet) of fabric strip 806, similar to skirt 100 of FIG. 7 above. In the illustrated embodiment, skirt 802 may comprise three strips of fabric 806A-806C having corresponding fringe portions 808A-808C. The fringe portion 808A of tissue strip 806A may extend from an inlet edge 812 of tissue strip 806A located near an inlet end 814 of the prosthetic valve. The filaments 810 of the fringe portion 808A may extend close to the second row II of support members (see FIG. 12B). The filaments 810 of the second fabric strip 806B may extend from an inlet edge 816 of the fabric strip 806B and may extend as close to the level of the third row III of supports. The filaments 810 of the third fabric strip 806C may extend from an outlet edge 818 of the fabric strip 806C to approximately the level of the fourth row IV of supports.
[0114] [0114] Filaments 810 may comprise or originate from frayed threads, textured threads etc. In certain embodiments, the fabric strips 806 of the sealing member 802 may comprise a thread density of 50 to 500 threads per inch, 100 to 400 threads per inch, 150 to 350 threads per inch or 150 to 300 threads per inch. In certain embodiments, the fabric strips of the sealing member 802 may have a thread density of 150 threads per inch or 300 threads per inch. The yarns can have any suitable filament density, such as 5 to 100 filaments per yarn, 10 to 50 filaments per yarn, or 10 to 20 filaments per yarn. In particular modalities, the threads can comprise textured threads with 18 threads per thread. The filaments can have thicknesses from 1 μm to 100 μm, 1 μm to 50 μm or 1 μm to 20 μm. In particular embodiments, the filaments can have a thickness or diameter of 10 μm.
[0115] [0115] FIGS. 32-37 show a main layer of softening, covering or sealing element 1000, according to another modality. The sealing element 1000 can comprise a fabric body with a plurality of woven portions and a plurality of elastic, stretchable portions configured as floating wire portions, and can be incorporated into any of the external prosthetic valve linings here described. FIG. 32 illustrates the sealing element 1000 in a flat configuration, where the x axis corresponds to the circumferential direction and the y axis corresponds to the axial direction when the sealing element is attached to a frame of a prosthetic valve. The sealing member 1000 may comprise a plurality of first woven portions 1002 configured as woven strips or stripes that extend along the x-axis, a plurality of second woven portions 1004 configured as woven strips or stripes that extend along the x-axis and a plurality of portions of floating yarn, strips or stripes 1006 extending along the x-axis. The various portions of woven and floating yarn can be separated from each other along the y-axis. In the illustrated configuration, the first woven portions 1002 may comprise a fabric pattern that is different from the fabric pattern of the second woven portions 1004, as described in more detail below.
[0116] [0116] For example, in the illustrated configuration, the sealing element 1000 may comprise a first woven portion 1002A. Moving in a direction along the positive y-axis, the sealing element 1000 may further comprise a second woven portion 1004A, a floating yarn portion 1006A, a second woven portion 1004B, a floating yarn portion 1006B, a second woven portion 1004C, a floating yarn portion 1006C, a second woven portion 1004D, a floating yarn portion 1006D, a second woven portion 1004E,
[0117] [0117] With reference to FIGS. 32 and 33, the sealing element 1000 can comprise a plurality of first wires 1008 oriented generally along the x axis and a plurality of second wires 1010 oriented generally along the y axis. In certain configurations, the first yarns 1008 can be warp yarns, which means that during the weaving process the yarns 1008 are kept on the loom, while the second yarns 1010 are weft yarns, which are interwoven with the warp yarns by a mobile shuttle or weft transport mechanism during the weaving process. However, in other embodiments, the first yarns 1008 can be weft yarns and the second yarns 1010 can be warp yarns.
[0118] [0118] Each of the first yarns 1008 and the second yarns 1010 may comprise a plurality of constituent filaments 1012 which are spun, wound, twisted, mixed, interlaced, etc., together to form the respective yarns. Examples of individual filaments 1012 of the second strands 1010 can be seen in FIGS. 33 - 36. In some embodiments, the first 1008 yarns may have a denier of about 1 D to about 200 D, about 10 D to about 100 D, about 10 D to about 80 D, about 10 D up to about 60 D or about 10 D up to about 50 D. In some embodiments, the first 1008 yarns can have a filament count of 1 to about 600 filaments per yarn, about 10 to about 300 strands per strand, about 10 to about 100 strands per strand, about 10 to about 60 strands per strand, about 10 to about 50 strands per strand, or about 10 to about 30 strands per strand. In particular embodiments, the first 1008 threads can have a denier of about 40 D and a filament count of 24 threads per thread. The first 1008 yarns can also be twisted or untwisted yarns. In the illustrated model, the filaments 1012 of the first threads 1008 are not textured. However, in other embodiments, the first strands 1008 may comprise textured filaments.
[0119] [0119] The second strands 1010 can be textured strands comprising a plurality of textured strands 1012. For example, the strands 1012 of the second strands 1010 can be textured, for example, by twisting the strands, fixing them thermally and untwisting the filaments as described above. In some embodiments, the second 1010 threads may have a denier of about 1 D to about 200 D, about 10 D to about 100 D, about 10 D to about 80 D or about 10 D to about 70 D. In some embodiments, a filament count of the second 1010 strands can be 1 strand per strand to about 100 strands per strand, about 10 to about 80 strands per strand, about 10 to about 60 filaments per wire or about 10 to about 50 filaments per wire. In particular embodiments, the second strands 1010 can have a denier of about 68 D and a filament count of about 36 filaments per strand.
[0120] [0120] The first threads 1008 and the second threads 1010 can be woven together to form the woven portions of the sealing member, as noted above. For example, in the first woven portions
[0121] [0121] In the second woven portions 1004A-1004G, the first and second threads 1008, 1010 can be interwoven into another pattern that is different from the weaving pattern of the first woven portions 1002A-1002C. For example, in the illustrated embodiment, the first and second yarns 1008, 1010 can be woven together in a leno weave pattern on the second woven portions 1004A-1004G. FIG. 34 illustrates the leno fabric of the second woven portion 1004B in more detail. With reference to FIG. 34, the leno fabric can comprise one or more leno yarns or "lumen ends" 1014, and first four yarns 1008A, 1008B, 1008C and 1008D, also referred to as "warp ends". The pattern illustrated in FIG. 34 includes a single 1014 leno yarn in the form of a "half leno" fabric. However, in other embodiments, the leno fabric pattern can be a complete leno fabric comprising two 1014 interlaced leno yarns, or other leno-derived fabrics. Examples of various leno fabrics and associated weaving techniques are illustrated in FIGS. 39 A- 39J.
[0122] [0122] In the half leno fabric illustrated in FIG. 34, the first wires 100 8A-1008D can extend parallel to the x-axis, and the second wires 1010 can be interwoven with the first wires 1008A-1008D in, for example, a flat fabric. The 1014 yarn can weave around the first 1008A-1008D yarns, so that the 1014 leno yarn crosses up or over the first 1008A-1008D yarns with each pass in the positive y direction, cross below or behind the next second wire 1010 in the x direction and extend back over the first wires 1008A-1008D in the negative y direction. This pattern can be repeated along the length of the second woven portion 1004B. In this way, the second woven portions 1004 can be relatively narrow, strong woven portions spaced axially from one another along the frame when the sealing element is mounted on a frame. The leno yarn 1014 can serve to hold the first wires 1008A-1008D and the second wires 1010 in place relative to each other, as the prosthetic valve is pulled and expanded, and can provide resistance to the second woven portions 1004 while minimizing width.
[0123] [0123] In certain embodiments, each of the second woven portions 1004A-1004G may comprise the leno weave pattern described above. In other embodiments, one or more of the second woven portions 1004A-1004G can be configured differently, as incorporating more or less first yarns 1008 in the leno fabric, having several ends of woven woven around several groups of yarns 1008, etc. In still other embodiments, a chemical blocking method can be used where the leno fabric and / or a flat fabric includes warp threads with core construction filaments. The sheath of the individual filaments may be made of low melting temperature polymers, such as biocompatible polypropylene, and the filament core may be made of another biocompatible polymer, such as polyester. After the weaving process, the thermal fastening process described below can allow the sheath to soften and / or melt. Upon cooling, the softened sheath polymer can join the polyester strands of the core. This can create a glued body, allowing the woven frame to be blocked.
[0124] [0124] Referring again to FIG. 32, the floating yarn portions 1006 may comprise yarns extending on only one axis between respective second woven portions 1004 which are separated from each other along the y axis. For example, taking the floating yarn portion 1006A as a representative example, the floating yarn portion 1006A may comprise a plurality of second yarns 1010 that leave the leno fabric of the second woven portion 1004A, extend through the floating yarn portion 1006A, and are incorporated into the leno fabric of the second woven portion 1004B. In some embodiments, the density of the second threads in the floating thread portions 1006 can be from about 10 to about 200 threads per inch, about 50 to about 200 threads per inch, or about 100 to about 200 threads per inch. threads per inch. In particular embodiments, the density of the second 1010 threads can be about 60-80 threads per inch. In other embodiments, the floating yarn portions may include first yarns 1008 arranged below or above, but not intertwined with the second yarns 1010, so that the second yarns float over the first yarns or vice versa. In still other embodiments, the portions of floating yarn may, instead, be configured as any other stretchable structure, such as stretchable, knitted, braided or non-woven fabric, or polymeric membranes, to name a few that are elastically stretchable, at least in the axial direction of the prosthetic valve.
[0125] [0125] In the illustrated embodiment, each of the woven portions 1002A-1002C and 10 04A-1004G and each of the floating yarn portions 1006A-1006E can have width dimensions in the direction of the y axis. The widths of the constituent portions can be configured in such a way that the total length L1 (Fig. 32) of the sealing element 1000 generally corresponds to the axial length of a prosthetic heart valve in the expanded configuration. For example, in the illustrated embodiment, the first woven portions 1002A and 1002C can each have a width W1. In certain embodiments, the width W1 can be configured in such a way that portions of the first woven portions 1002A and 1002C can be folded over the inlet and outlet ends of the frame of a prosthetic valve.
[0126] [0126] The first woven portion 1002B may have a width W2. With reference to FIG. 12 B, when sealing element 1000 is used in combination with the Edwards Lifesciences SA-PIEN® 3 prosthetic heart valve frame, width W 2 can be configured to match the axial dimension of the frame openings defined by the members of support between the fourth row IV and the fifth row V of supports. In some embodiments, the width W 2 of the first fabric portion 1002B can be about 2 mm to about 20 mm, about 2 mm to about 12 mm, or about 3 mm to about 10. - particular qualities, the width W2 can be about 7 mm.
[0127] [0127] The second woven portions 1004A-1004G can have widths W3 (Fig. 34). In the illustrated embodiment, all second woven portions 1004A-1004G are W3 wide, but one or more of the second woven portions can also have different widths. In certain embodiments, the width W3 can be relatively short, such as about 0.1 mm to about 3 mm, from about 0.1 mm to about
[0128] [0128] With reference to FIGS. 32 and 35 - 38, in certain embodiments, the sealing element 1000 and, in particular, the floating wire portions 1006A-1006E, can be resiliently elastic between a first natural or relaxed configuration (FIGS. 32 and FIG. 35) corresponding to the radially expanded state of the prosthetic valve, and a second elongated or tensioned configuration (FIGS. 37 and 38) corresponding to the radially compressed state of the prosthetic valve. Thus, the floating wire portions 1006A-1006E can have initial widths W 4, when the sealing element 1000 is in the relaxed, unstretched state. FIG. 35 illustrates a portion of the floating yarn portion 1006B in the natural and relaxed state. When the fabric is in the relaxed state, the textured filaments 1012 of the second threads 1010 can be folded and twisted in various directions, so that the floating thread portion 1006B has a bulky, wavy or pillow-like quality. When tensioned, the folds, twists, etc., of filaments 1012 can be pulled at least partially straight along the y-axis, causing the second wires 1010 to lengthen. With reference to FIG. 36, the width of the floating wire portions 1006 can thus increase to a second width W5 which is wider than the initial width W4.
[0129] [0129] The cumulative effect of the floating wire portions 1006A- 1006E that increase in width from the initial width W4 to the second width W5 is that the overall axial dimension of the display element 1000 can increase from the initial length L1 (FIG. 32) up to a second overall length L2 (Fig. 37) that is greater than the first length L1. FIG. 37 illustrates the sealing element 1000 in the stretched configuration with the second wires 1010 of the floating wire portions 1006A-1006E straightened under tension, such that the overall length of the sealing element increases to the second length L2. In certain embodiments, the size, number, spacing, etc., of the floating wire portions 1006, and the degree of texturing of the second constituent wires 1010, can be selected such that the second length L2 of the sealing element 1000 corresponds to the length of a prosthetic valve frame when the prosthetic valve is furrowed for delivery in a dispensing device. In particular embodiments, the relaxed initial width W4 of the floating wire portions 1006 can be about 1 mm to about 10 mm, about 1 mm to about 8 mm, or about 1 mm to about 5 mm. In particular embodiments, the initial width W4 can be about 4 mm.
[0130] [0130] FIG. 38 illustrates an edge portion of the sealing element 1000 clamped between a pair of clamps 1050. In certain embodiments, the bulky and wavy nature of the textured yarns 1010 in the floating yarn portions 1006 may result in the floating yarn portions 1006 having a thickness t1 which is greater than a thickness t2 of the woven portions 1002 and 1004. For example, in certain embodiments the thickness t1 of the floating yarn portions 1006 may be twice, three times, four times, five times, six times, or even ten times greater than the t2 thickness of the woven portions 1002 and 1004, or more, when the sealing member is in the relaxed state. This can allow the floating wire portions 1006 to cushion the native leaflets between the valve body and / or against an anchor or ring in which the prosthetic valve is implanted. Floating wire portions 1006 can also occupy voids or spaces in the anatomy and / or promote tissue growth in the floating wire portions, as in the modalities described above. When tension is applied to stretch the floating yarn portions 1006, the thickness t1 may decrease as the second textured yarns 1010 straighten. In certain embodiments, the thickness t1 can be equal or almost equal to the thickness t2 of the woven portions 1002 and 1004, when the sealing member is in the tensioned state. When the tension in the sealing member 1000 is released, as during the expansion of the prosthetic valve, wires 1012 can resume their textured shape and the thickness of the floating wire portions 1006 can return to the initial thickness t1.
[0131] [0131] In certain embodiments, the floating wire portions 1006A-1006E can be configured so that the sealing member 1000 can stretch by about 10% to about 500%, about 10% to about 300%, about from 10% to about 200%, about 10% to about 100%, about 10% to about 80% or about 10% to about 50%. In particular embodiments, the floating wire portions 1006A-1006E can be configured to allow the sealing member 1000 to extend by about 30%, corresponding to the elongation of the frame 1022 between the expanded and furrowed configurations. As noted above, increasing the width of the floating wire portions 1006A-1006E can also result in a corresponding decrease in the thickness of the floating wire portions, reducing the puck profile of the prosthetic valve during delivery.
[0132] [0132] In some embodiments, the first and second threads 1008 and 1010 may comprise any of several biocompatible thermoplastic polymers, such as PET, nylon, and PTFE, UHMWPE, etc., or other suitable natural or synthetic fibers. In certain embodiments, the sealing member 1000 can be woven on a loom and then can be heat treated or thermally fixed to achieve the desired size and configuration. For example, depending on the material selected, the thermal fixation can cause the sealing member 1000 to shrink. The thermal adjustment can also cause a texturing effect, or increase the amount of texturing, of the second 1010 threads. After heat treatment, the openings 1016 can be created in the first woven portion 1002B (for example, by laser cutting) and the member seal can be incorporated into an external cover, such as cover 1018, for mounting on a prosthetic valve. In some embodiments, openings 1016 can also be created before heat treatment.
[0133] [0133] The loops, filaments, floating portions, etc., of the prosthetic sealing members described herein can be configured to promote a biological response to form a seal between the prosthetic valve and the surrounding anatomy, as described above. In certain configurations, the sealing elements described in this document can be configured to form a seal for a selected period of time. For example, in certain modalities, the open porous nature of the loops, filaments, wires, etc., may allow a selected amount of paravalvular leakage around the prosthetic valve in the period of time following implantation. The amount of paravalvular leakage after the sealing structure can be gradually reduced over a selected period of time, since the biological response to the loops, filaments, wires, etc., causes blood to clot, thrombus formation, etc. In some embodiments, the sealing members, and in particular the loops, filaments, threads, etc., of the paravalvular sealing structure, can be treated with one or more agents that inhibit the biological response to the sealing structures. For example, in certain modalities, loops, filaments, threads, etc., can be treated with heparin. In certain embodiments, the amount or concentration of the agent (s) can be selected so that the agents are depleted after a selected period of time (for example, days, weeks or months) after implantation of the valve. As the agent (s) is (are) depleted, the biological response
[0134] [0134] FIGS. 39A-39J illustrate various leno fabrics and leno weaving techniques that can be used to produce the 1000 screening member, or any of the other sealing members described herein. FIG. 39A is a cross-sectional view illustrating a shelter (for example, the temporary separation of warp yarns to form upper and lower warp yarns), where a leno yarn "end leno", "crossing end" 1060 forms the upper cover on the left of the figure above a weft thread 1064, and a standard warp thread 1062 forms the lower cover. FIG. 39B illustrates a successive shed in which the loom yarn 1060 forms the upper right shed of the standard warp yarn 1062. In FIGS. 39A and 39B, leno yarn 1060 can cross under standard yarn 1062 in a pattern known as bottom folding. Alternatively, the leno yarn 1060 can cross the standard yarn 1062, known as top fold, as in FIGS. 39H and 39I.
[0135] [0135] FIG. 39C illustrates an interlacing pattern of leno fabric produced when a warp bundle is used on a loom, and the distortion or tension of leno yarns 1060 and standard yarns 1062 is the same, such that both yarns 1060 and yarns 1062 curve around the weft threads 1064. FIG. 39D illustrates a lacing pattern of leno fabric produced when multiple warp bundles are used, and leno yarns 1060 are less stressed than standard yarns 1062, such that standard yarns 1062 remain relatively straight in the fabric, and perpendicular to the weft threads 1064, while the wool threads 1060 bend around the standard threads 1062.
[0136] [0136] FIG. 39E illustrates an interlacing pattern corresponding to FIG. 39C, but in which the alternating linen yarns 1060 are drawn by stitch (for example, a technique in which the linen yarns are stretched through hedges) such that adjacent linen yarns 1060 have opposite loop directions. FIG. 39F illustrates an interlacing pattern corresponding to FIG. 39D, but in which adjacent yarn yarns 1060 are drawn by stitches, so that adjacent yarn yarns have opposite looping directions.
[0137] [0137] FIG. 39G is a cross-sectional view of a flat leno fabric structure taken through weft threads 1064.
[0138] [0138] FIG. 39J illustrates a representative leno fabric, seen from the reverse side of the fabric.
[0139] [0139] Example 1
[0140] [0140] In a first representative example, an acute test was performed on animals, in which prosthetic heart valves including several skirts of the type shown in FIG. 31 were implanted in sheep aortic valves. A first prosthetic valve that was tested included a sealing member or skirt with a thread density of 300 threads per inch, where the threads had a fringe or filament density of 18 threads per thread. A second prosthetic valve had a skirt with a thread density of 150 threads per inch, in which the threads had a filament density of 18 threads per thread. A prosthetic valve without an outer skirt was also implemented as a control.
[0141] [0141] Before implantation, the prosthetic valves were partially furrowed and a stack of annuloplasty rings (for example, two annuloplasty rings stacked concentrically) was fixed around the outside of the prosthetic valves by suture. Each stack of annuloplasty rings had a cinched plastic cable tie around the bodies of the annuloplasty rings. The piles of annuloplasty rings were attached to the prosthetic valves in such a way that the heads of the cable ties were located between the outer skirt of the prosthetic valve and the bodies of the annuloplasty rings. In other words, the cable ties served to move the bodies away from the annuloplasty rings of the prosthetic valves, so that an axial extension channel was defined between the outer skirt and the annuloplasty ring on both sides of the mooring head. cable, to induce leakage after prosthetic valves. For the prosthetic control valve, without an outer skirt, the head of the cable tie removed the annuloplasty rings from the outer surface of the prosthetic valve frame.
[0142] [0142] Prosthetic valves were implanted in a surgical procedure. An amount of paravalvular leakage base through the space between the prosthetic valve frame and the annuloplasty ring stack was determined using echocardiography and / or angiography, while the patient was heparinized. Heparinization was then reversed (for example, by the administration of protamine sulphate), and paravalvular leakage was assessed using echocardiography and angiography for a period of 5 to 30 minutes. The prosthetic valves were then surgically recovered.
[0143] [0143] For the first prosthetic valve having the skirt with a wire density of 300 threads per inch, no paravalvular leakage was observed before or after the heparin reversal. At the time of the explant, the space between the outer skirt and the fixed annuloplasty rings became completely sealed by the formation of a thrombus, and the head of the cable tie became at least partially encased by one or more thrombi.
[0144] [0144] For the second prosthetic valve with the skirt with a thread density of 150 threads per inch, paravalvular leakage having an angiographic degree of 2 + was observed by echocardiography, and a degree of 1 + by angiography, before heparin reversal. As used here, the reference to "paravalvular leak" or "regurgitation" graduated in, for example, 1+, 2+, 3+ or 4+ refers to the angiographic classification guidelines provided by the American Society of Ecocar- diography using assessment techniques, including, for example, echocardiography, angiography, color flow Doppler, fluoroscopy, etc. (Zoghbi et al., ASE Guidelines and Standards: Recommendations for non-invasive assessment of native valve regurgitation - Report from the American Society of Echocardiography Developed in Collaboration with the Society for Cardiovascular Magnetic Resonance, Journal of the American Society of Echocardiography, April 2017). After the heparin reversal, no paravalvular leak was detected, either by echocardiography or angiography. At the time of the explant, the space between the outer skirt and the annuloplasty rings fixed, had become completely sealed by thrombus formation, and the head of the cable tie had become at least partially encapsulated by one or more thrombi.
[0145] [0145] For both, the first and second prosthetic valves including fringed skirts, the immediate acute reduction in paravalvular leakage can be attributable to the interaction between blood and the thread filaments. The continuous gradual reduction in paravalvular leakage observed for the second prosthetic valve after the heparin reversal may be attributable to a continuous biological response at the cellular level, resulting in the formation of thrombus and sealing. For the first prosthetic valve with a wire density of 300 wires per inch, the space between the frame and the annuloplasty rings was sealed almost immediately. For the second prosthetic valve with a wire density of 150 wires per inch, the time to fully close or seal the space between the frame and the annuloplasty rings (for example, no detectable paravalvular leakage) was 5 to 30 minutes .
[0146] [0146] For the prosthetic control valve that did not have an external outlet, paravalvular leakage with a degree of 2+ or higher was observed under heparinization. After heparin reversal, paravalvular leakage was observed with an angiographic degree from 2+ to 3+. At the time of the explant, the space between the annuloplasty rings and the prosthetic valve frame was fully open or patent, and no appreciable biological sealing occurred.
[0147] [0147] General considerations
[0148] [0148] Any of the sealing element modalities disclosed in this document can be used in combination with any of the disclosed prosthetic heart valves and / or armature modalities. A prosthetic heart valve can also include any of the sealing elements described herein, or portions thereof, in any combination.
[0149] [0149] For the purposes of this description, certain aspects, advantages, and innovative features of the modalities of such disclosure are described here. The methods, devices and systems disclosed should not be construed as limiting in any way. Instead, the present disclosure is aimed at all the innovative and non-obvious characteristics of the various modalities disclosed, in isolation and in various combinations and sub-combinations with each other. The methods, devices and systems are not limited to any specific aspect or characteristic or combination thereof, nor do the disclosed modalities require that any one or more specific advantages be present or that problems be solved.
[0150] [0150] Although the operations of some of the disclosed modalities are described in a specific sequential order for a convenient presentation, it should be understood that this form of description covers rearrangement, unless a specific order is required by the specific language set out below. For example, operations described sequentially can, in some cases, be reorganized or executed simultaneously. In addition, for the sake of simplicity, the attached figures may not show the various ways in which the disclosed methods can be used in conjunction with other methods. In addition, the description sometimes uses terms like "provide" or "achieve" to describe the methods disclosed. These terms are high-level abstractions from the actual operations that are performed. Actual operations that correspond to these terms may vary depending on the particular implementation and are easily discernible by a person skilled in the art.
[0151] [0151] As used in this application and in the claims, the singular forms "a", "o" and "one" include plural forms, unless the context clearly indicates otherwise. In addition, the term "includes" means "understands". In addition, the terms “coupled” and “associated” generally mean electrically, electromagnetically, and / or physically (for example, mechanically or chemically), coupled or articulated and does not exclude the presence of intermediate elements between the coupled or associated items , without specific opposite language.
[0152] [0152] In the context of this application, the terms "lower" and "upper" are used interchangeably with the terms "inlet" and "flow", respectively. Thus, for example, in certain configurations, the lower end of the valve is its inlet end and the upper end of the valve is its outlet end.
[0153] [0153] As used here, the term "proximal" refers to a position, direction or portion of a device that is closer to the user and further away from the implantation site. As used here, the term "distal" refers to a position, direction or portion of a device that is further from the user and closer to the implantation site. Like this,
[0154] [0154] Unless otherwise stated, all numbers expressing component quantities, molecular weights, percentages, temperatures, times, etc., as used in the specification or claims are to be understood as being modified by the term “about ”. Therefore, unless otherwise indicated, implicitly or explicitly, the numerical parameters established are approximations that may depend on the desired properties sought and / or limits of detection under conditions / test methods familiar to those skilled in the art. When the modalities of the techniques discussed above are directly and explicitly distinguished, the numbers of the modalities are not approximate unless the word "about" is invoked. In addition, not all alternatives mentioned here are equivalent.
[0155] [0155] In some examples, values, procedures or devices may be referred to as "lowest", "best", "minimum" or similar. It will be appreciated that such descriptions are intended to indicate that a selection among many alternatives can be made, and that these selections need not be better, smaller or preferable to other selections.
[0156] [0156] In the description, certain terms can be used such as "up", "down", "top", "bottom", "horizontal", "vertical", "left", "right" and the like. These terms are used, when applicable, to provide clarity of description when dealing with relative relationships. However, these terms are not intended to imply absolute relationships, positions and / or orientations. For example, with respect to an object, a "top" surface can become a "bottom" surface simply by turning the object over. However, it is still the same object.
[0157] [0157] In view of the many possible modalities to which the principles of the disclosed technology can be applied, it must be recognized that the illustrated modalities are only examples and should not be considered as limiting the scope of the disclosure. Instead, the scope of the disclosure is at least as wide as the following claims.

权利要求:
Claims (19)
[1]
1. Implantable prosthetic valve that is radially foldable for a folded configuration and radially expandable for an expanded configuration, the prosthetic valve characterized by the fact that it comprises: an annular frame that has an inlet end, an outlet end and a longitudinal axis ; a leaflet structure positioned within the frame and attached to it; and a sealing element attached to the frame, the sealing element including: a first woven portion extending circumferentially around the frame, the first woven portion comprising a plurality of interwoven filaments; a second woven portion that extends circumferentially around the frame and away from the first woven portion along the longitudinal axis of the frame; in which at least a portion of the filaments come out of the fabric of the first woven portion and forms loops that extend radially outwardly from the frame.
[2]
2. Prosthetic valve, according to claim 1, characterized by the fact that the filaments that form the loops extend from and return to the first woven portion.
[3]
3. Prosthetic valve, according to claim 1, characterized by the fact that: the first woven portion comprises a first row of handles; and the second woven portion comprises a second row of loops, the handles of the second row of loops comprising threads extending from and returning to the second woven portion.
[4]
4. Prosthetic valve, according to claim 3, characterized by the fact that the handles of the second row of handles are circumferentially displaced from the handles of the first row of handles.
[5]
5. Prosthetic valve according to claim 3 or 4, characterized in that: the plurality of interlaced filaments of the first woven portion further comprises at least one first interlaced filament with a plurality of second filaments; and a portion of the at least one first filament forms the loops of the first woven portion.
[6]
6. Prosthetic valve according to claim 5, characterized in that: the sealing element further comprises an intermediate sealing portion between the first and the second woven portions, the intermediate sealing portion comprising a plurality of second filaments ; and a portion of the at least one first filament extends along the longitudinal axis of the frame between the first woven portion and the second woven portion, and is interlaced with the second filaments of the intermediate sealing portion.
[7]
7. Prosthetic valve according to claim 6, characterized in that a portion of the at least one first filament forms the handles of the second woven portion.
[8]
8. Prosthetic valve, according to any one of claims 5 to 7, characterized in that the second filaments are warp threads and at least one first filament is a weft thread.
[9]
9. Prosthetic valve, according to claim 8, characterized by the fact that at least one of the warp and weft threads comprise textured threads.
[10]
10. Prosthetic valve according to claim 8 or 9, characterized in that the warp and weft threads comprise fibers, the fibers having a diameter from 1 μm to 20 μm to promote the formation of thrombi around the sealing element.
[11]
11. Prosthetic valve, according to claim 1, characterized by the fact that the filaments that form the handles originate from the first woven portion and extend in a curvilinear way along the longitudinal axis of the frame to the second woven portion .
[12]
12. Prosthetic valve, according to claim 11, characterized by the fact that the filaments that form the handles come out of a fabric of the first woven portion and are incorporated into a fabric of the second woven portion, so that the handles form a portion of yarn floating between the first and second woven portions.
[13]
13. Prosthetic valve according to claim 11 or 12, characterized in that the floating wire portion comprises a first loop layer and a second loop layer radially outwardly from the first loop layer.
[14]
14. Prosthetic valve according to claim 13, characterized by the fact that: the sealing element comprises a first strip of fabric, a second strip of fabric and a third strip of fabric; a plurality of the filaments forming the loops extend between the first strip of fabric and the second strip of fabric; a plurality of filaments forming the loops extending between the second strip of fabric and the third strip of fabric; and the sealing member is folded around the second fabric strip, so that the first fabric strip and the third fabric strip are adjacent to each other to form the first woven portion, the filaments extending between the first strip of fabric and the second strip of fabric form the first layer of loops, and the filaments extending between the second strip of fabric and the third strip of fabric form the second layer of loops.
[15]
15. Prosthetic valve, according to any of claims 11 to 14, characterized by the fact that the sealing element is fixed to the frame so that the filaments coming out of the fabric of the first woven portion form the handles when the frame is in the expanded configuration and be pulled straight when the frame is in the collapsed configuration.
[16]
16. Method for making a sealing element for a prosthetic heart valve, characterized by the fact that it comprises: weaving at least one weft thread together with a plurality of warp threads to form a first woven portion; dropping at least one weft of a fabric from the first woven portion; wrap at least one weft thread around a removable warp thread, the removable warp thread being pulled away from the first woven portion, the at least one weft thread being wrapped around the removable warp thread, so that the at least one weft thread extends over, and is not interwoven with, warp threads arranged between the first woven portion and the removable warp thread; re-incorporating the at least one weft thread into the fabric of the first woven portion so that the at least one weft thread forms a loop that extends from and returns to the first woven portion; and removing the removable warp thread from the sealing member to release the loop formed by at least one weft thread.
[17]
17. Method, according to claim 16, characterized by the fact that it still comprises: before removing the removable warp thread, repeat the weaving, the fall, the wrapping and the re-incorporation, to form a plurality of loops around circumference of the sealing element.
[18]
18. Method, according to claim 17, characterized in that it still comprises adjusting the plurality of handles in shape, so that the handles extend outwardly from the sealing element.
[19]
19. Method according to claim 16, characterized in that it further comprises: before removing the removable warp yarn, weave at least one weft yarn together with the warp yarns, so that the at least one yarn weft extends beyond the removable warp yarn and forms a second woven portion away from the first woven portion; dropping at least one weft of a fabric from the second woven portion; wrap the at least one weft thread around a second removable warp thread that is away from the second woven portion, the at least one weft thread being wrapped around the second removable warp thread, so that the at least one weft thread extends over the top, and is not intertwined with warp threads arranged between the second woven portion and the second removable warp thread; and re-incorporating at least one weft thread into the fabric of the second woven portion, so that the at least one weft thread forms a second loop that extends and returns to the second woven portion.

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CN111132634A|2020-05-08|

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法律状态:
2021-11-03| B350| Update of information on the portal [chapter 15.35 patent gazette]|

优先权:

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申请号 | 申请日 | 专利标题

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US201762544704P| true| 2017-08-11|2017-08-11|

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US62/544,704|2017-08-11|

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PCT/US2018/046261|WO2019032992A2|2017-08-11|2018-08-10|Sealing element for prosthetic heart valve|

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