• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to an external heel fixator (1) intended to be used in the treatment of heel fractures. The external fixator (1) comprises a main arm (3) and a secondary arm (5) which carry respective terminal blocks (31, 51, 71) provided with clamps for the passage of pins destined to penetrate the fractured calcaneus. The external fixator (1) according to the invention provides numerous degrees of freedom in the adjustment of the position and inclination of the terminal boards (31, 51, 71), so that the position and the inclination with which the pins carried by the clamps penetrate into the fractured calcaneus can be carefully adjusted according to the specific morphology of the patient's heel and / or the specific fracture geometry.
    公开号:CH711978A2
    申请号:CH01639/16
    申请日:2016-12-12
    公开日:2017-06-30
    发明作者:Marconetto Massimo
    申请人:Sim Soluzioni Innovative Medicali Sagl；
    IPC主号:
    专利说明:

    Description
    Technical field of the invention [0001] The present invention relates to an external fixator for calcaneus intended to be used in the treatment of heel fractures.
    [0002] In particular, the present invention refers to an external fixator for calcaneus which has a substantially higher versatility than the known external heel fixators.
    Prior art [0003] In general, in the treatment of invoices it is possible to intervene either by reducing the fracture with an open surgical operation and applying an internal fixator or by reducing the fracture percutaneously and applying an external fixator.
    [0004] The external fixator is an orthopedic device mounted outside the body that is fixed to the bone by pins or metal wires that pierce the skin and is designed to stabilize and maintain bone fragments in place until the fracture heals .
    [0005] As a general rule, the reduction of percutaneous fracture and the use of an external fixator involve a considerable reduction both in the duration of the surgery and in the subsequent hospitalization time after surgery, as well as a reduction in risks of complications due to surgical exposure.
    [0006] In particular, the choice to opt for percutaneous fracture reduction and external fixation has proved to be particularly advantageous in the treatment of heel fractures, as it allows to obtain a stable and comparable fracture reconstruction with that obtainable with a fixation internal but with less risk of complications and with shorter hospitalization times.
    [0007] External fixators for heel are known from the state of the art which comprise a main arm and a secondary arm rotatably mounted at one of its two ends to said main arm. The main arm has adjustable length and carries at the opposite ends respective terminal blocks with clamps for the passage of pins destined to penetrate into the anterior and posterior pituitary of the calcaneus, respectively; the secondary arm carries at its free end, opposite to the point of articulation to the main arm, an additional terminal block for the passage of pins destined to penetrate the subtalar portion of the calcaneus.
    [0008] Thanks to the fact that the secondary arm can rotate with respect to the main arm and thanks to the fact that the length of the main arm can be adjusted, the external fixator can be positioned at the heel according to the fracture pattern.
    [0009] However, external heel fixators of the known type are not free from drawbacks. In particular, despite the possibility of adjusting the length of the main arm and the orientation of the secondary arm with respect to the main arm, the degrees of freedom in the configuration of said external fixators are very limited.
    [0010] Consequently, it is not possible to accurately and accurately adapt the configuration of the external fixator to the specific morphology of the heel of the individual patient and to the specific geometry of the single fracture.
    [0011] The main object of the present invention is to overcome the drawbacks of the prior art, providing an external heel fixator which is highly versatile and can be adapted from time to time to the specific morphology of the patient's heel and / or to the specific geometry of the fracture.
    [0012] This and other objects are achieved by the external fixator for heel according to the invention, as claimed in the appended claims.
    Summary description of the invention [0013] Thanks to the fact that the degrees of freedom in the adjustment of the external fixator for heel according to the invention are increased with respect to external fixators of a known type, the configuration of said external fixator can be accurately adapted to the specific morphology of the patient's heel and / or the specific geometry of the fracture.
    [0014] In particular, according to the invention the secondary arm is not only pivotally articulated to the main arm but is also slidably mounted on said main arm, so that the position of the articulation point of said secondary arm with respect to the ends of the main arm can be chosen from time to time according to specific needs.
    [0015] According to a preferred embodiment of the invention, the terminal block of the secondary arm is slidably mounted on said secondary arm, so that the distance of said terminal board from the point of articulation of the secondary arm to the main arm can be chosen each time according to specific needs.
    [0016] According to a preferred embodiment of the invention, at least one of the terminal blocks of the main arm is slidably connected to the respective end of said main arm, so that the distance between the terminal blocks of the main arm can be chosen each time according to specific needs.
    [0017] According to a preferred embodiment of the invention, at least one of the terminal blocks of the main arm is connected to said main arm so as to be able to rotate around the longitudinal axis of said main arm.
    [0018] According to a preferred embodiment of the invention, at least one of the terminal blocks of the main arm is rotatably connected to the respective end of said main arm so as to be able to rotate about an axis perpendicular to the longitudinal axis of said main arm , so that the inclination of said terminal block with respect to the longitudinal axis of said main arm can be chosen each time according to specific needs.
    [0019] According to a preferred embodiment of the invention, the terminals of at least one terminal board of the external fixator are mounted rotatable with respect to the body of the terminal board, so that the inclination of said terminals with respect to the respective terminal board can be chosen each time according to specific needs.
    Brief description of the drawings [0020] Further characteristics and advantages of the invention will become more apparent from the detailed description of a preferred embodiment of the invention itself, given below by way of non-limiting example, with reference to the attached drawings, in which: fig. 1 a is a perspective view of an external fixator for heel according to a preferred embodiment of the invention; fig. 1 b is an exploded perspective view of the external fixator of fig. 1 a; fig. 2 shows the external fixator of Figs. 1a-1b applied to a fractured calcaneus.
    Detailed description of an embodiment of the invention [0021] With reference to figs. 1a-1b shows an external fixator for calcaneus, suitable for treating calcaneus fractures, indicated as a whole with the reference number 1.
    [0022] In a per se known manner, the external fixator 1 comprises a main arm 3 and a secondary arm 5 whose longitudinal axes L1 and L2 lie on a same plane P, the secondary arm 5 being rotatably articulated in correspondence with one of its first end 5a to the main arm 3.
    [0023] In the illustrated embodiment, for this purpose at its first end 5a, said secondary arm 5 has a hole 7 through which a pin 9 passes which is connected to the main arm 3: the secondary arm 5 can thus rotate around the pin 9 and a nut 11 can be tightened on said pin 11 to block the rotation of the secondary arm 5 once the desired inclination has been obtained. The main arm 3 carries in proximity of each of its opposite ends 3a, 3b a first terminal board 31 and, respectively, a second terminal block 51.
    [0024] The secondary arm 5 carries - near its second end 5b, opposite to the first end 5a - a third terminal block 71.
    [0025] Each terminal board 31, 51.71 comprises a main body 33, 53, 73 which is provided with means for connection to one of the arms 3, 5 of the external fixator 1 and which houses terminals 35a, 35b, 55a, 55b, 75a, 75b through which the pins which are intended to penetrate inside the fractured heel can be made to pass.
    [0026] According to the invention, the external fixator 1 can be adjusted according to a large number of different degrees of freedom, so that the position of the three terminals 31.51,71 relative to one another - and therefore of the pins that penetrate in the heel fractured one with respect to the other - it can be modified at will and chosen so as to accurately adapt to the specific morphology of the heel of the individual patient and / or to the specific geometry of the single fracture.
    [0027] In particular, according to the invention, the main arm 3 comprises a non-threaded portion 3c on which a bush 13 is mounted in a sliding manner which carries the pin 9 on which the secondary arm 5 is articulated. Tightening the nut 11 on the pin 9, not only the rotation of the secondary arm 5 is blocked, but also the sliding of the bush 13 along the unthreaded portion 3c of the main arm 3.
    [0028] Since it is preferable that the main arm 3 and the secondary arm 5 remain on the same plane P, in order to prevent the rotation of the ring nut 13 with respect to the main arm 3-and the consequent undesired inclination of the secondary arm 5 with respect to the main arm 3 - the unthreaded portion 3c of the main arm 3 does not have a circular cross-section, but has at least one portion 3 and flattened; correspondingly the hole of the bush 13 is not circular, but has a flat portion correspondence, so that thanks to the geometric coupling between the flattened portion 3 and the flat portion of the hole of the bush 13 said bush 13 cannot rotate around the main arm 3, but just slide along its unthreaded portion 3c.
    [0029] Therefore, in the external fixator for heel 1 according to the invention, not only the secondary arm can rotate around its point of articulation by varying the angular position of the third terminal block 71, but the distance of the articulation point of said secondary arm carrying said third terminal block 71 from the first terminal board 31 and from the second terminal block 51.
    [0030] Furthermore, the main arm 3 comprises a threaded portion 3 d and the main body 53 of the second terminal block 51 comprises a through hole 57, so that the second terminal block 51 can slide along said 3d threaded portion. A pair of threaded nuts 59, 61 mounted on the threaded portion 3d of the main arm 3 on the opposite sides of the main body 53 and in engagement with said threaded portion 3d of said main arm 3 allow to adjust the position of the second terminal block 51 along the main arm 3 itself. In this way it is possible to adjust the distance between the first terminal block 31 and the second terminal block 51.
    [0031] In the preferred embodiment shown in Figs. 1 a, 1 b, it is also possible to vary the inclination of the main body 53 of the second terminal block 51 by rotating it about the longitudinal axis L1 of the main arm 3.
    [0032] For this purpose, said main body 53 comprises an internally threaded hole 63 which is arranged perpendicularly to the through hole 57 and opens into said through hole 57 and a threaded pin 65 which can be engaged with the internal thread of said threaded hole 63 : when the threaded pin 65 is slackened, the rotation of the main body 53 relative to the main arm 3 is allowed; on the other hand, when the threaded pin 65 is screwed into the threaded hole 63 it abuts against the surface of the main arm 3 and prevents further rotation of the main body 53 of the second terminal block 51.
    [0033] In the preferred embodiment shown in Figs. 1 a, 1 b, it is also possible to vary the angular position of the main body 33 of the first terminal board 31 causing it to rotate about an axis perpendicular to the plane P defined by the longitudinal axes L1, L2 of the main arm 3 and of the secondary arm 5 of the external fixator 1.
    [0034] For this purpose, the end 3a of the main arm 3 comprises a through hole 37 and said main body 33 comprises a pair of parallel brackets 39, 41 between which the end 3a of the main arm 3 bearing the through hole 37. Said brackets 39, 41 are provided with respective holes 39a, 41 a which can be aligned with the through hole 37 of the main arm 3a, the hole of one of said shelves being a through hole 39a and the hole of the other said brackets being an internally threaded hole 4la. A threaded pin 43 can pass through the through holes 39a, 37 and engage in the internally threaded hole 4la. When the threaded pin 43 is slackened, the main body 33 of the first terminal block 31 can rotate about an axis perpendicular to the plane P defined by the longitudinal axes L1, L2 of the main arm 3 and of the secondary arm 5; once the desired angular position is reached, the threaded pin 43 can be narrow, thus preventing further rotation.
    [0035] In the preferred embodiment shown in Figs. 1a, 1b, it is also possible to vary the position of the main body 73 of the third terminal block 71 by sliding it along the secondary arm 5 of the external fixator 1.
    [0036] For this purpose, the body of the secondary shaft 5 comprises a slot 77 and said main body 73 comprises a slider 79 which can slide along said slot 77. The slider 79 comprises a through hole 81 arranged parallel to the extension of the slot 77 inside which a pin 83 can be engaged which can be inserted inside the slot 77 parallel to it, so that the cursor 79 can slide along the pin 83. The cursor 79 also comprises a threaded pin 85 transverse with respect to at slot 77; a nut 87 can engage with the threaded pin 85. When the nut 87 is slackened, the slider 79 - and with it the main body 73 - can slide along the slot 77, approaching or moving away, respectively, from the second end 5b of the arm secondary 5; once the desired position is reached, the nut 87 can be tightened, avoiding further unwanted movements.
    [0037] In the preferred embodiment shown in figs. 1 a, 1 b, it is also possible to rotate the terminals 35a, 35b, 55a, 55b of the terminal boards 31.51 carried by the main arm 3 around their own axis, varying their angular position.
    [0038] For this purpose, the terminal block bodies 33, 53 of the first and second terminal blocks 31, 51 comprise respective through holes 47a, 47b, 67a, 67b through which threaded stems 36a, 36b, 56a, 56b are made to pass together with associated to the terminals 35a, 35b, 55a, 55b. Nuts 49a, 49b, 69a, 69b can engage with the threaded stems 36a, 36b, 56a, 56b of the clamps 35a, 35b, 55a, 55b: when the nuts 49a, 49b, 69a, 69b are loosened, the clamps 35a, 35b, 55a, 55b can be made to rotate around its own axis; once the desired angular position has been reached, the nuts 49a, 49b, 69a, 69b are tightened on the threaded rods 36a, 36b, 56a, 56b so as to avoid further undesired rotations.
    [0039] In the preferred embodiment shown in Figs. 1a, 1b, it is also possible to rotate the terminals 75a, 75b of the terminal block 71 carried by the secondary arm 5, by varying their angular position.
    [0040] For this purpose, the main body 73 comprises a through hole 89 and the cursor 79 comprises a second transverse threaded pin 91, opposite the transverse threaded pin 85, which can pass through the through hole 89 of the main body 73. A nut 93 can engage with the second transverse threaded pin 91: when the nut 93 is slackened, the main body 73 which carries the terminals 75a, 75b can rotate around the second threaded pin 91; once the desired angular position is reached, the nut 93 is tightened, preventing further unwanted rotations.
    [0041] From the above description, it is clear that the external fixator for heel 1 according to the invention has numerous degrees of freedom in its adjustment so that the configuration of said external fixator 1 can be accurately adapted to the specific morphology of the patient's heel and / or to the specific geometry of the fracture. In particular, in the preferred embodiment illustrated in figs. 1a-1b: - the angular position of the secondary arm 5 can be adjusted according to the double arrow FI;
    权利要求:
    Claims (11)
    [1]
    - the position of the secondary arm 5 along the main arm 3 can be adjusted according to the double arrow F2; - the position of the second terminal block 51 along the main arm 3 can be adjusted according to the double arrow F3; - the angular position of the first terminal board 31 around an axis perpendicular to the plane on which the axes of the main arm 3 and of the secondary arm 5 can be positioned can be adjusted according to the double arrow F4; - the angular position of the second terminal block 51 around the main arm 3 can be adjusted according to the double arrow F5; - the position of the third terminal block 71 along the secondary arm 5 can be adjusted according to the double arrow F6; - the angular position of the terminals of the first and second terminal board 31, 51 with respect to the respective terminal block bodies can be adjusted according to the double arrow F7; - the angular position of the terminals of the third terminal block 71 with respect to the secondary arm 5 can be adjusted according to the double arrow F8. [0042] Fig. 2 shows the external fixator applied to a fractured calcaneus 100. The external fixator 1 is arranged at the heel 100 according to the fracture pattern, with the first and second terminal blocks 31, 51 of the main arm 3 in correspondence with the anterior and posterior apophysis 101, 103 of the calcaneus, respectively, and the third terminal block 71 of the secondary arm 5 at the subtalar portion of the calcaneus. [0043] Pins 110 are fixed to the clamps of the terminal blocks 31,51,71 and penetrate into the calcaneus 100. Thanks to the structure of the external fixator 1, the position and the inclination with which the pins 110 penetrate into the calcaneus 100 can be accurately adjusted to function of the specific morphology of the patient's heel and / or of the specific geometry of the fracture. From the above description it is evident that the invention achieves the above-stated purpose. It is also evident that what described in relation to the preferred embodiment illustrated above has been given by way of example and that numerous modifications and variations are possible without departing from the scope of the appended claims. claims
    1. External heel fixator (1), comprising a main arm (3) and a secondary arm (5) whose longitudinal axes (L1, L2) lie on the same plane, said secondary arm (5) being rotatably articulated in correspondence with of one of its first ends (5a) to said main arm (3), wherein said main arm (3) carries near to each of its opposite ends (3a, 3b) a first terminal board (31) and, respectively, a second terminal board (51) and in which said secondary arm (5) carries, near its second end (5b) opposite to said first end (5a), a third terminal board (71), each of said terminal boards (31, 51, 71 ) comprising a main body (33, 53, 73) which houses clamps (35a, 35b, 55a, 55b, 75a, 75b) through which pins can be made to penetrate inside a fractured heel, in which said first end (5a) of said secondary arm (5) is mounted s correctable on said main arm (3) and in which means (11) are provided to allow / prevent the sliding of said first end (5a) of said secondary arm (5) along said main arm (3), in which said main arm (3) comprises a non-threaded portion (3c) on which a bush (13) carrying a pin (9) is slidably mounted, wherein said first end (5a) of said secondary arm (5) provides a hole ( 7) through which said pin (9) passes and in which a nut (11) can be loosened / tightened on said pin (9) to allow / prevent the sliding of said first end (5a) of said secondary arm (5) along said main arm (3), characterized in that said unthreaded portion (3c) of said main arm (3) has at least one flattened portion (3 e) and the hole of said bush (13) has a corresponding flat portion.
    [2]
    2. External fixator for heel (1) according to claim 1, wherein means (3 e) are provided to prevent the rotation of said secondary arm (5) around the longitudinal axis (L1) of said main arm (3).
    [3]
    3. External fixator for heel (1) according to claim 1, wherein the main body (53) of one (51) of said terminal blocks (31,51) carried by said main arm (3) is slidably mounted on said main arm (3) and in which means (59, 61) are provided to allow / prevent the sliding of said main body (53) of said terminal board (51) along said main arm (3).
    [4]
    4. External fixator for heel (1) according to any one of the previous claims, wherein the main body (53) of said one (51) of said terminal boards (31, 51) carried by said main arm (3) is mounted on said main arm (3) rotatably about the longitudinal axis (L1) of said main arm and in which means (65) are provided to allow / prevent the rotation of said main body (53) of said terminal board (51) with respect to said main arm (3).
    [5]
    5. External fixator for heel (1) according to any one of the previous claims, wherein the main body (33) of one (31) of said terminal blocks (31,51) carried by said main arm (3) is mounted on said arm main (3) rotatably about an axis perpendicular to the plane on which the longitudinal axes (L1, L2) of said main arm (3) and of said secondary arm (5) lie and in which means (43) are provided for allowing / preventing the rotation of said main body (33) of said terminal block (31) around said axis.
    [6]
    6. External fixator for heel (1) according to any one of the previous claims, wherein the main body (73) of said terminal board (71) carried by said secondary arm (5) is slidably mounted on said secondary arm (5) and in which means (87) are provided to allow / prevent the sliding of said main body (73) of said terminal board (71) along said secondary arm (5).
    [7]
    7. External fixator for heel (1) according to any one of the previous claims, wherein the main body (73) of said terminal board (71) carried by said secondary arm (5) is mounted on said secondary arm (5) in a rotary manner around the longitudinal axis (L2) of said secondary arm and in which means (93) are provided to allow / prevent the rotation of said main body (73) of said terminal board (71) with respect to said secondary arm (5).
    [8]
    8. External fixator for heel (1) according to claim 1, wherein the clamps (35a, 35b, 55a, 55b) of said terminal blocks (31, 51) carried by said main arm (3) are rotatably mounted on the respective main body (33, 53) of said terminal boards (31, 51) and in which means (49a, 49b, 69a, 69b) are provided to allow / prevent the rotation of said clamps (35a, 35b, 55a, 55b) with respect to said body main (33, 53) of said terminal boards (31, 51).
    [9]
    9. External fixator for heel (1) according to claim 3, wherein said main arm (3) comprises a threaded portion (3d), in which the main body (53) of said terminal board (51) comprises a through hole (57 ), and in which a pair of internally threaded nuts (59, 61) mounted on said threaded portion (3d) of said main arm (3) on the opposite sides of said main body (53) of said terminal block (51) allow / prevent the sliding of said main body (53) of said terminal board (51) along said main arm (3).
    [10]
    10. External fixator for heel (1) according to claim 5, wherein said main arm (3) comprises at one end (3a) a through hole (37), in which the main body (33) of said terminal board (31) comprises a pair of parallel brackets (39, 41) between which said end (3a) of said main arm (3) is inserted, said brackets (39, 41) being provided with respective holes (39a, 4la) aligned with said through hole of said main arm and in which a threaded pin (43) can pass through said holes and engage with them to allow / prevent the rotation of said main body (33) of said terminal board (31) around said axis.
    [11]
    11. External fixator for heel (1) according to claim 6, wherein said secondary arm (5) comprises a slot (77), in which the main body (73) of terminal board (71) comprises a slider (79) which it can slide along said slot (77) and in which means (87) are provided to allow / prevent the sliding of said slider (79) along said slot (77).
    类似技术:
    公开号 | 公开日 | 专利标题
    US2250417A|1941-07-22|Fracture reduction and retention device
    US8425512B2|2013-04-23|Fixation device and multiple-axis joint for a fixation device
    US2507710A|1950-05-16|Adjustable-angle surgical instrument
    US2393694A|1946-01-29|Surgical apparatus
    EP3245966B1|2020-06-17|Connecting rod for an external fixation device
    KR870002818A|1987-04-13|External bone fixation
    US2494792A|1950-01-17|Skull clamp
    RU2014132756A|2016-02-27|Ratchet spinal device |
    CN108778167A|2018-11-09|External stability pillar
    JP2016514502A|2016-05-23|Wrist joint device
    CH711978A2|2017-06-30|External fixator for heel.
    TW201524719A|2015-07-01|Robotic ram having adjustable structure
    BRPI0913529B1|2019-10-08|ORTHOPEDIC SUPPORT FOR A KNEE JOINT
    US2432695A|1947-12-16|Fracture appliance
    CN204798065U|2015-11-25|Bone joint prosthesis platform gasket subassembly
    US20190151133A1|2019-05-23|Adjusting mechanism of support brace
    CN104799981A|2015-07-29|Bone and joint prosthesis platform gasket assembly
    JP2016528993A|2016-09-23|Orthopedic compression / distraction device
    BR112013033126B1|2020-11-24|EXTERNAL FIXING DEVICE
    US505382A|1893-09-19|Fracture apparatus
    US2706475A|1955-04-19|Surgical tongs
    US1662758A|1928-03-13|Femur splint
    DE202017107103U1|2018-01-25|Adjustment mechanism of a support
    US821619A|1906-05-29|Surgical arm-splint.
    CN207734216U|2018-08-17|A kind of adjustable Kirschner wire guider for annular external fixing rack
    同族专利:
    公开号 | 公开日
    ITUB20159689A1|2017-06-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2004045451A2|2002-11-15|2004-06-03|Amei Technologies Inc.|Apparatus and method for maintaining bones in a healing position|
    US7588571B2|2005-03-18|2009-09-15|Ron Anthon Olsen|Adjustable splint for osteosynthesis with modular joint|
    EP2645947A1|2010-12-02|2013-10-09|Ospedale San Raffaele S.r.l.|External bone fixator system|
    法律状态:
    2020-05-29| AZW| Rejection (application)|
    优先权:
    申请号 | 申请日 | 专利标题
    ITUB2015A009689A|ITUB20159689A1|2015-12-16|2015-12-16|EXTERNAL FIXER FOR CALCAGNO|
    [返回顶部]