• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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  • 优先权
    • 专利摘要:
    thrombus filter and method of use. In the field of blood vessel filters, a thrombus filter comprising a sheath (1), a thrombus retaining mesh (2) with a retaining port, a first advance piece (4) and a control loop is disclosed. . the thrombus filter is also provided with prevention umbrella (3), in which the opening direction of the overflow prevention umbrella (3) is identical to the direction of the retaining door. the overflow prevention umbrella (3) is provided outside the thrombus retention net (2). a second advance piece (5) is located on the sheath (1) for pushing and pulling the overflow prevention umbrella (3). the overflow prevention umbrella (3) comprises an umbrella surface (32) and an umbrella support (31) connected between the second advance piece (5) and the umbrella surface (32 ), and the open end of the surface of the umbrella (32) is a form with closed memory. during filtering of thrombi in blood vessels, the overflow prevention umbrella (3) is opened by the thrombus retaining mesh (2); upon completion of filtration, the thrombus retaining mesh (2) returns to the interior of the overflow prevention umbrella (3) and the surface of the umbrella (32) of the overflow prevention umbrella (3 ) will be removed to the interior of the center of the retaining door, in order to completely cover the retaining door, thus avoiding the overflow of plates; the sheath (1) is pushed forward to retract the thrombus retaining mesh (2); and the overflow prevention umbrella (3) is pulled into the sheath (1). the thrombus filter can effectively recover calcified plaques in blood vessels through the thrombus retention mesh (2) and the overflow prevention umbrella (3) can effectively prevent thrombus overflow when it is retracted after thrombus capture.
    公开号:BR112015011796B1
    申请号:R112015011796-1
    申请日:2013-10-14
    公开日:2021-06-15
    发明作者:Zhenjun Zi；Rongjun Lei；Shouliang Lv；Zhifei Zhang；Jinhu Yu
    申请人:Venus Medtech (Hangzhou), Inc；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [0001] The present invention relates to a blood vessel filter and method of using the same, in particular to a thrombus filter and method of using the same. HISTORY OF THE INVENTION
    [0002] With the wide application of intervention operation in the world, complications resulting from it are also increasingly recurrent. For example, in the interventional operation for aortic valve replacement, due to severe stenosis and calcification in the aorta, there is a need to support and replace the original aortic valve through the aortic valve, but most aortas with severe stenosis and calcification will create a reduced internal diameter of the blood flow channel, at this time, in general, the original calcified valve is first pre-expanded with a balloon, during this process, part of the calcified clots will be displaced during the expansion process, or the thrombus generated during the operation will enter coronary arteries, brain and lower limb vessels, etc., with the blood flow thus leading to vascular embolism and ultimately resulting in death or paralysis of the patient.
    [0003] In order to solve the above problems, Chinese Patent No. CN1515326A, published on 28/July/2004, entitled "Thrombus Filter", discloses a thrombus filter, comprising a thrombus retention network , a guidewire, a distal connecting piece and a proximal connecting piece, where the thrombus retaining mesh is in a funnel-shaped mesh structure made of a shape memory nickel titanium alloy wire , with a coating film with filtering pores, the retraction line of the memory nickel titanium alloy wire is wound through the mesh pores of the thrombus retention mesh opening part, then connected to the proximal connection piece, the rear portion of the thrombus retention net mesh structure is connected to the distal connection piece, and the front end of the distal connection piece is provided with a driving head. The opening portion of the thrombus retainer is connected to the memory nickel titanium alloy wire to make the thrombus retainer tightly fitted to the inner wall of the blood vessel under the restorative force of the memory nickel alloy titanium wire in order to effectively filter the thrombus; when the thrombus retainer is retracted, the retraction line first squeezes the opening of the funnel-shaped thrombus retaining net, and can effectively prevent thrombus overflow, so the thrombus retainer can improve thrombus recovery rate, reduce the risks of coronary artery embolism, brain blood vessels and lower limbs, etc., and has the advantages of simple structure, convenient operation, good filterability, high safety and reliability, and can be widely used in a variety of angioplasty and thrombolysis as an umbrella to prevent overflow into the thrombus or displaced clot in order to reduce the risk of the operation and improve the success rate of the operation.
    [0004] The thrombus filter above discloses only the case where the opening portion of the retaining mesh is facing the proximal end (control end) and does not describe the thrombus retaining means where the opening portion of the retaining mesh is facing the distal end (away from the control end), and this technology has not actually been developed yet. At the same time, in the channel of blood vessels with stenosis, as the thrombosis filter can not only capture the thrombus or displaced clot, but also not interfere with the implantation process, it is a problem to be solved. SUMMARY
    [0005] In order to overcome the defects in the prior art, the present invention provides a thrombus filter that not only can effectively prevent thrombus leakage when it is retracted after thrombus capture, but also has a simple structure and convenient operation. .
    [0006] The technical solution of the present invention is a thrombus filter, comprising a sheath, a thrombus retaining mesh with a retaining port, a first advance piece to drive the thrombus retaining mesh into and out of the sheath and a control handle to control the first piece of advance,
    [0007] also provided with an overflow prevention umbrella, in which the opening direction of the overflow prevention umbrella is identical to that of the retaining door, and the overflow prevention umbrella is provided sliding in a glove outside the thrombus retention mesh;
    [0008] a second advance piece, which is located in the sheath for pushing and pulling the overflow prevention umbrella;
    [0009] the overflow prevention umbrella comprises an umbrella support and an umbrella surface, the umbrella support has one end connected to the second advance piece and the other end connected to the umbrella surface -umbrella, and the open end of the umbrella surface is in the shape of contracted memory;
    [00010] when the thrombus retaining mesh is released, the overflow prevention umbrella opening is pushed in the open condition by the thrombus retaining mesh retaining port; and
    [00011] when the thrombus retaining net is returned, the umbrella surface of the overflow prevention umbrella covers the thrombus retaining port, and the open end of the umbrella surface is compressed to prevent the thrombus leakage.
    [00012] Preferably, both the thrombus retention net and the overflow prevention umbrella are in a net structure, and the net structure is made of a memory alloy.
    [00013] Preferably, the thrombus retention mesh is a mesh structure, the overflow prevention umbrella consists of an umbrella support and a coating film with filter pores coated on the umbrella support and the umbrella holder is made of a memory alloy.
    [00014] Preferably, the thrombus retention net is a net structure, the overflow prevention umbrella umbrella surface is in the form of a net, the umbrella support is a support rod connected to the umbrella surface, and the umbrella surface is made of a memory alloy.
    [00015] Preferably, thrombus retention net consists of a structure and a coating film with filter pores coated on the structure, the overflow prevention umbrella umbrella surface is in the form of a net, the support of the Umbrella is a support rod connected to the surface of the umbrella and the surface of the umbrella is made of a memory alloy.
    [00016] Preferably, the second feed piece has a tubular shape, the second feed piece is provided with slip in a sleeve on the first feed piece, and is coaxially positioned with the first feed piece.
    [00017] Preferably, the first advance piece has a tubular shape and the hollow portion inside the first tubular advance piece forms a transport channel.
    [00018] Preferably, the surface of the umbrella has a circular shape, the outer edge of the circular shape is connected to the umbrella support.
    [00019] Preferably, one end of the thrombus retaining mesh is a retaining port, the other end of it is a mesh bottom, the bottom part of the mesh is extended in the sheath and connected to the first advance piece.
    [00020] The present invention has the following beneficial effects: the general structure is simple, the operation is convenient, when the thrombus retention net and the overflow prevention umbrella are released, the thrombus generated during the process of operation can be effectively recovered, and when the overflow prevention net is retracted after thrombus capture, thrombus leakage can be effectively prevented.
    [00021] The present invention provides a method for using the thrombus filter according to claim 1, comprising the steps of:
    [00022] (1) a sheath loaded with a thrombus retention net and an overflow prevention umbrella are transported to a position in the blood vessel necessary to capture the thrombus;
    [00023] (2) the sheath is retracted to expose the retention net and the overflow prevention umbrella outside the sheath and release these together, the thrombus retention net retention door is opened at the same time the opening of the overflow prevention umbrella is pushed to an open condition, and the thrombus is captured in the reverse flow of blood by the thrombus retention mesh;
    [00024] (3) After thrombus capture is completed, the thrombus retention net is returned through the first advance piece, the umbrella surface of the overflow prevention umbrella is moved forward with respect to the thrombus retention net and covers the retention port and the open end of the umbrella surface is compressed under the advancing force of the shape with memory in order to prevent thrombus leakage;
    [00025] (4) after the opening of the overflow prevention umbrella is fully compressed, the sheath is pushed forward to retract the overflow prevention umbrella back into the sheath;
    [00026] (5) the sheath loaded with the thrombus retention mesh and the overflow prevention umbrella are removed from the blood vessel.
    [00027] As compared to the prior art, the present invention has the beneficial effects as below, the thrombus filter has a simple method of use and operating procedure, it is convenient to use, and not only has a good filtering effect thrombus generated during the operative process, but can also effectively prevent thrombus leakage when it is extracted after thrombus capture. BRIEF DESCRIPTION OF THE DRAWINGS
    [00028] Figure 1 is a schematic structural diagram of example 1 of the present invention.
    [00029] Figure 2 is a schematic structural diagram of example 2 of the present invention.
    [00030] Figure 3 is a schematic structural diagram of example 3 of the present invention.
    [00031] Figure 4 is a schematic structural diagram of example 4 of the present invention.
    [00032] Figure 5 is a schematic structural diagram of example 5 of the present invention, when the thrombus filter is placed inside the blood vessel.
    [00033] Figure 6 is a schematic structural diagram of example 5 of the present invention, when the thrombus is captured by the thrombus filter.
    [00034] Figure 7 is a schematic structural diagram of example 5 of the present invention, when the thrombus filter retaining mesh is returned.
    [00035] Figure 8 is a schematic structural diagram in example 5 of the present invention, when the thrombus filter is retracted.
    [00036] Figure 9 is a local structural diagram of the example of the present invention.
    [00037] Figure 10 is a sectional view of Figure 9. APPLICATION DESCRIPTION
    [00038] The technical solutions of the present invention will be further illustrated below in combination with drawings of the description and the particular examples. It should be understood that the particular examples described herein are only used to explain the present invention, but are not intended to create any limitation.
    [00039] As shown in Figures 1-10, the thrombus filter of the present invention comprises a sheath 1 and a control loop (not shown), in the initial state, a thrombus retaining mesh 2 and a prevention umbrella of overflow 3, and a first advance piece 4 and a second advance piece 5 connected to thrombus retaining mesh 2 and the overflow prevention umbrella 3, respectively, and controlled by the control loop are accommodated in the sheath 1 Between them, the first advance piece 4 and the second advance piece 5 have a tubular shape, the second advance piece 5 has a larger diameter and coaxially provided in a sleeve outside the first advance piece 4; the thrombus retention net 2 is funnel-shaped, one end of the thrombus retention net 2 is a retention port, the other end of it is a net bottom, the bottom part of the net is connected to first advance piece 4 which is located inside the sheath 1; the bottom part of the mesh also has a hole corresponding to the tube hole of the first advance piece 4, the vent can be used as a channel for the balloon, intervention device, etc. when they are on the same path with the filter of thrombus. Therefore, when there is a need to import the balloon and the intervention device, etc. into the blood vessel, it is unnecessary to make an additional opening in the blood vessel I thus facilitating the reduction of damage to the human body. Naturally the first advance piece 4 and the second advance piece 5 can also employ a fit between a cylindrical shape and a tubular shape or other structures that can perform the advancing function, all these applications are within the scope of the protection of the present invention .
    [00040] The overflow prevention umbrella 3 is provided in a sleeve on the peripheral wall of the converged thrombus retention mesh 2, and the overflow prevention umbrella 3 can be divided into two parts, the umbrella support 31 and the surface of the umbrella 32, the umbrella support 31 is provided in a sleeve on the peripheral wall of the thrombus retaining mesh 2. In the present invention, the first advance piece 4, the second piece of advance 5, the umbrella holder 31 and the umbrella surface 32, have the ends adjacent to the control handle, such as the proximal ends and the distant ends of the control handle, such as the distal ends, the proximal end of the holder the umbrella 31 is connected to the distal end of the second advance piece 5; the proximal end of the surface of the umbrella 32 is connected to the distal end of the umbrella holder 31, the direction of the open end of the surface of the umbrella 32 is identical to that of the retaining port of the thrombus retaining mesh 2, a opening at the open end of the surface of the umbrella32 is in an actively compressed state, which is used to cover the retention port of the thrombus retention mesh 2.
    [00041] The memory alloy material is a new material that has the advantages of being non-magnetic, having wear resistance, corrosion resistance, non-toxicity, etc., when it is cooled, in the austenite phase state, it is soft and It can be easily compressed into the bridge pipe, and when it is released into the body, it turns into a martensite phase and restores the design shape.
    [00042] To facilitate the implementation of the process, the umbrella support 31 and the umbrella surface 32 can be in a single piece structure, the two are manufactured from an alloy of the material with memory and the production of a structure single-piece is simple. In addition, the umbrella support 31 and the umbrella surface 32 can also be in a composite structure, both being connected to each other by means of a suture or connecting piece, so as to further reduce consumables. and the overall size.
    [00043] The materials for the umbrella support 31 and the surface of the umbrella 32 can be different, the umbrella 31 can be manufactured from a material that is contracted in the axial direction of the sheath in the original state and is flexible ; the umbrella support 31 is moved with the expansion and convergence of thrombus retaining mesh 2, particularly, after the thrombus retaining mesh 2 is opened, the umbrella support 31 will also be advanced in the open condition.
    [00044] The control handle can perform a pull and push operation on the first advance piece 4, while the control handle can be an intrinsic part at the proximal end of the first advance piece 4, and can also be separately constructed with the first advance piece 4 and assembled and arranged. The control handle can not only control the advancing movement of the thrombus retention net 2, but can also control the advancing movement of the sheath 1 and the overflow prevention umbrella 3 when the overflowing umbrella is displaced. Overflow prevention 3 is controlled and supported by the second advance piece 5 and the sheath 1 is retracted, the movement of the overflow prevention umbrella 3 is limited by the second advance piece 5, and the friction force back is overcome, based on the same reasoning, the first advance piece 4 is connected to the thrombus retention net 2 to perform the forward and backward movements of the sheath 1. After the sheath 1 is loaded with the thrombus retention net 2 and the overflow prevention umbrella 3 is transported to the designated position in blood vessel I, the sheath 1 is retracted, the overflow prevention umbrella 3 and the thrombus retaining mesh 2 is kept relatively in a static state. co by the relatively fixed second advance piece 5 and the first advance piece 4, and placed in the blood vessel.
    [00045] According to the characteristics of the thrombus retention net 2 and the overflow prevention umbrella 3, the present invention comprises at least four examples below, but not limited to these.
    [00046] Example 1: As shown in Figure 1, both thrombus retention mesh 2 (black line in bold) and overflow prevention umbrella 3 are in a mesh structure, the mesh structure is braided from a memory alloy, in which thrombus retention net 2 is in an open state at body temperature and overflow prevention umbrella 3 is in a compressed state at body temperature, and the expansion force produced in the Thrombus retaining mesh 2 under the tendency to expand is higher than the compression force on the overflow prevention umbrella 3 under the compressed state, that is, if the thrombus retaining mesh 2 is open the temperature of the body, the overflow prevention umbrella 3 will be subjected to a force and pushed open by the thrombus retaining mesh 2. The open end of the surface of the umbrella 32 of the overflow prevention umbrella 3 is in a form of comp memory At the same time, the open end of the surface of the umbrella 32 can always be kept in convergence towards the centre, i.e. coverage in the retaining port of the thrombus retaining mesh 2 is obtained. The distal position of the retaining port in the thrombus retaining mesh 2 is connected to the first advancement piece 4, and the thrombus retaining mesh 2 can be freely pushed into the sheath 1 through the first advancement piece 4; the umbrella holder 31 of the overflow prevention umbrella 3 is connected to the second advance piece 5, and the overflow prevention umbrella 3 can be freely pushed into the sheath 1 through the second advance piece 5.
    [00047] Example 2: As shown in Figure 2, thrombus retention net 2 is a net structure, the net structure is braided from a memory alloy, thrombus retention net 2 is in a state open at body temperature. The surface of the umbrella 32 of the overflow prevention umbrella 3 is a coating film with filter pores, the umbrella holder 31 (black bold line) is made of a memory alloy strip, the umbrella 31 is axially disposed around the sheath 1 and the longitudinal direction of the umbrella holder 31 is identical to the direction of the sheath 1, the memory shape for the distal end of the umbrella holder 31 is an arc which bends towards the axial center, the proximal end of the umbrella holder 31 is connected to the second advance piece 5, at body temperature, the distal end of the umbrella holder 31 is converging to the axial direction of the sheath 1, wherein the surface of the umbrella 32 is coated on the peripheral wall of the umbrella holder 31, and moved with the expansion and convergence of the umbrella holder 31.
    [00048] Example 3: As shown in Figure 3, thrombus retaining mesh 2 (black line in bold) is a mesh structure, the mesh structure is braided by a memory alloy and the thrombus retaining mesh 2 is in an open state under body temperature. The surface of the umbrella 32 of the overflow prevention umbrella 3 is in a mesh structure braided by a memory alloy wire, wherein the memory state of the opening of the surface of the umbrella 32 is in a state. convergent; the umbrella support 31 (black bold line, which is stronger than the thrombus retention net line 2) is a support rod connected to the surface of the umbrella 32, the two ends of the support rod are connected to the second advance piece 5 and the umbrella surface 32 respectively.
    [00049] The thrombus retaining mesh 2 in examples 1, 2 and 3 is braided by a metal wire containing a supporting force, is advanced to an open condition by a balloon and molded; and it can also be fabricated from memory alloy materials and at body temperature it is actively expanded by restoring expanded memory shape.
    [00050] Example 4: As shown in Figure 4, thrombus retention mesh 2 consists of a structure 21 (black line in bold) and a coating film 22 with filter pores, wherein the coating film 22 is coated. on the peripheral wall of the frame 21, the frame 21 is made of a memory alloy strip, one end of the frame 21 is connected to the first advance piece 4, and at body temperature, the distant part of the first advance piece 4 over the frame 21 will be enveloped in the direction away from the axis of the sheath 1, wherein the coating film 22 is coated on the peripheral wall of the frame 21, and moved with the expansion and convergence of the frame 21. The surface of the umbrella 32 of the overflow prevention umbrella 3 is in a mesh structure braided by a memory alloy wire, wherein the memory state of the surface of the umbrella 32 is in a converged state; the umbrella support 31 (black bold line, which is stronger than the frame line 21) is a support rod connected to the surface of the umbrella 32, the two ends of the support rod are connected to the second advancing piece 5 and the umbrella surface 32, respectively.
    [00051] The structure of thrombus retention mesh 2 in example 4 is a metal rod with a supporting force, this is pushed in an open condition by a balloon and molded; and it can also be fabricated from a memory alloy material and at body temperature it is actively expanded by restoring expanded memory shape.
    [00052] Example 5: As shown in Figures 5-8, the thrombus retaining mesh 2 consists of a frame 21 and a coating film 22 with filter holes, wherein the coating film 22 is coated on the peripheral wall of the frame 21, frame 21 is manufactured from a memory alloy strip, one end of frame 21 is connected to first advance piece 4, at body temperature, the distal part of first advance piece 4 on frame 21 will be enveloped in the direction away from the axis of the sheath 1, wherein the coating film 22 is coated on the peripheral wall of the structure 21 and moved with the expansion and convergence of the structure 21. The open end of the surface of the umbrella 32 of the umbrella overflow prevention rain 3 is in a form with compressed memory, and the open end of the surface of the umbrella 32 can always be kept converging towards the center, i. thrombus retention 2 can be obtained.
    [00053] The coating films in the above examples are thin films of polymeric material, thin films of polymeric material generally refer to thin films of polymeric medical material, such as polytetrafluoroethylene medical film, polyurethane medical film, medical film of silicone gel, etc. Furthermore, the thrombus retaining mesh 2 and the overflow prevention umbrella 3 can also have other claimed structures than the aforementioned structure combinations, without being limited to the 5 cases of the examples.
    [00054] In the present invention, although there are several examples, the operating procedure and principle in each of the examples are the same, and the method of using the thrombus filter is described in detail in example 5 below.
    [00055] Step 1: As shown in Figure 5 (in this figure, the thrombus retention mesh 2 and the overflow prevention umbrella 3 are in an overlapping state and located in the sheath 1), the thrombus filter is placed inside of blood vessel I. Sheath 1 loaded with thrombus retaining mesh 2 and overflow prevention umbrella 3 are transported to the designated position on blood vessel I. Arrow direction shows direction of mixed blood flow with thrombus 6.
    [00056] Step 2: As shown in Figure 6 (the thrombus retention mesh 2 and the overflow prevention umbrella 3 are in superimposed state, and parts of them are exposed outside the sheath 1, at this time, the mesh of thrombus retention 2 and overflow prevention umbrella 3 are the same part in the figure, with no significant difference), thrombus 6 is captured by the thrombus filter. When the sheath 1 loaded with the thrombus retaining mesh 2 and the overflow prevention umbrella 3 is moved to the designated position on the blood vessel I, then the sheath 1 is pulled to make it returned at the same time, the overflow prevention umbrella 3 and the thrombus retaining net 2 are advanced through the first advance piece 4 and the second advance piece 5 to allow the overflow prevention umbrella 3 and the retention net of thrombus 2 overcomes the backward force (such force mainly refers to frictional force) and hold immobile in place, ie overflow prevention umbrella 3 and thrombus retention net 2 are maintained to ensure a relative immobility still in relation to the blood vessel I through the force of the first advance piece 4 and the second advance piece 5.
    [00057] At this point, if the thrombus retention network 2 is produced from a memory alloy material and the original state of the thrombus retention network 2 is an open state, the opening of the thrombus retention network 2 in the vessel sanguine is actively extended; if thrombus retaining mesh 2 is fabricated from a stainless steel metal, firstly, thrombus retaining mesh 2 is expanded to a suitable size by a balloon; at the same time the overflow prevention umbrella 3 which is provided in a sleeve on the peripheral wall of the thrombus retaining mesh 2 is also advanced to an open condition.
    [00058] As necessary, after the thrombus retention net 2 and the overflow prevention umbrella 3 are released, the steps of transport, placement and retraction of the surgical instruments are performed through channel II in the core of the second piece of advance 5, all processes are performed under a protected state.
    [00059] Step 3: As shown in Figure 7, the thrombus filter retaining mesh is retracted. After the device implantation process is complete, and when the conjugated thrombus 6 capture job is completed, the thrombus retention mesh 2 is pulled back to sheath 1 via the first advance piece 4 during this In the process, the thrombus retention mesh 2 and the overflow prevention umbrella 3 are alternated with each other in the thrombus retention mesh 2 retention port, i.e., the thrombus retention mesh 2 is moved backwards and is returned into the overflow prevention umbrella 3 and the overflow prevention umbrella 3 is kept immobile in relation to the blood vessel I, so as to avoid an injury to the blood vessel I during the return of the retention net. thrombus 2 and the overflow prevention umbrella 3 are moved forward relative to the thrombus retaining mesh 2 and the surface of the umbrella 32 covers the thrombus retaining mesh door 2 in the form of compressed memory. According to the alternating distance, a gradual or even complete separation of the overlapping parts will appear between the surface of the umbrella 32 of the overflow prevention umbrella 3 and the thrombus retention net 2, at this time the surface of the umbrella 32 will gradually or even completely cover the thrombus retention net retention port 2. That is, the surface of the umbrella 32 of the overflow prevention umbrella 3 will exceed the thrombus retention net retention port 2 and will converge towards the center of the retaining door, in order to obtain coverage on the retaining door, which is equivalent to the diameter of the retaining door being reduced under the effect of the surface of the umbrella 32, so that a shaped structure The cap is formed and covers the retaining port, thereby preventing easy overflow of thrombus 6 from the retaining port. When the open end of the overflow prevention umbrella opening 3 is completely closed due to the compressed memory shape itself (incomplete closure is possible as the converging opening under the constriction is very small, the situation in which the thrombus will not occur 6 overflows, this is understood to be approximately in a state that the open end is completely closed), the thrombus 6 obtained by filtering blood vessel I is encapsulated in thrombus retention mesh 2 by the overflow prevention umbrella 3. In Figure 7, the thrombus retention mesh 2 is not completely in place, that is, the overflow prevention mesh 3 does not completely cover the retention port of the thrombus retention mesh 2, at this time it is necessary for the thrombus retention mesh to thrombus retention 2 is returned, until overflow prevention net 3 completely covers thrombus retention net retention port 2 , then sheath 1 is pushed to fr. to retract the overflow prevention net 3 and the thrombus retention net 2.
    [00060] In the present invention, there is no explicit definition on the distinct boundaries between the surface of the umbrella 32 and the umbrella support 31 on the overflow prevention umbrella 3, while in the above situations, the surface of umbrella 32 can cover the retaining door. Between these, the surface of the umbrella 32 of the overflow prevention umbrella 3 and the retaining port of the thrombus retaining mesh 2 are staggered together, all the pieces hanging outside the retaining door will cover towards the center of the retaining port under the compression force, and the diameter of the retaining port is reduced, so as to prevent thrombus 6 overflow from the retaining port when the thrombus retaining mesh 3 and the guard -overflow prevention umbrella 3 are retracted into the sheath 1. The first advance piece 4 continuously pulls the thrombus retaining mesh 2 until the opening of the overflow prevention umbrella 3 is completely compressed, at this time, the Overflow prevention umbrella 3 can completely prevent thrombus overflow 6 of thrombus retention net 2.
    [00061] Step 4: As shown in Figure 8, the thrombus filter is retracted. After the opening of the overflow prevention umbrella 3 is completely contracted, the sheath 1 is pushed to move it forward, the overflow prevention umbrella 3 is completely accommodated inside the sheath 1 gradually from the rear of the guard -overflow prevention rain 3, so that the thrombus filter can carry out blood filtration in blood vessel I, and at the same time can resolve the thrombus overflow 6 when the thrombus retention net 2 is retracted, and ensure the stability and safety of environments in blood vessel I. As the mucous membrane of the inner wall of blood vessel I to be protected is fragile, when the overflow prevention umbrella 3 is positioned outside the sheath 1 and inside the blood vessel I, it must not show a relative movement between the overflow prevention umbrella 3 and the blood vessel I, if not, the outer wall of the overflow prevention umbrella 3 will easily scrape the inner wall of blood vessel I so as to cause damage or even injury to blood vessel I, therefore, when thrombus retention net 2 and overflow prevention umbrella 3 are released and retracted, this can be achieved mainly by the relative back and forth movement of the sheath 1. Furthermore, in order to produce additional protection on the inner wall of blood vessel I, the curved part of the overflow prevention umbrella 3 and thrombus retention network 2, in a memory state, is in an arch structure.
    [00062] Step 5: Sheath 1 loaded with thrombus retention mesh 2 and overflow prevention umbrella 3 are removed from blood vessel I.
    [00063] In the present invention, the surface of the umbrella 32 has at least the following three states: before the thrombus retaining mesh 2 is released, the surface of the umbrella 32 is located inside the sheath 1 and is provided in a glove on the peripheral wall of thrombus retention mesh 2; when the thrombus retaining mesh 2 is released, the surface of the umbrella 32 is positioned on the periphery of the thrombus retaining mesh 2 and expanded with the support of the thrombus retaining mesh 2; and when the thrombus retaining mesh 2 is retracted, the surface of the umbrella 32 is converged from the periphery of the retaining port of the thrombus retaining mesh 2 towards the center of the retaining port, forming a cover on the retaining port. of thrombus. The present invention has the following advantages: the general structure is simple, the operation is convenient and after the thrombus retention net 2 and the overflow prevention umbrella 3 are released, the thrombus 6 generated during the operation process can be effectively recovered, and when overflow prevention net 3 is retracted, thrombus leakage 6 can be effectively prevented.
    权利要求:
    Claims (9)
    [0001]
    1. THROMBUS FILTER, comprising a sheath (1), a thrombus retaining mesh (2) with a retaining port, a first advance piece (4) for driving the thrombus retaining mesh (2) inwards and out of the sheath (1) and a control handle for controlling the first advance piece (4), wherein the filter further comprises an overflow prevention umbrella (3), in which the opening direction of the umbrella overflow prevention rain (3) is identical to the direction of the retaining door; and a second advance piece (5), which is located inside the sheath (1) for pushing and pulling the overflow prevention umbrella (3); characterized by the fact that the overflow prevention umbrella (3) is provided in a glove outside the thrombus retention network (2); wherein the overflow prevention umbrella (3) comprises an umbrella holder (31) and an umbrella surface (32), wherein the umbrella holder (31) has an end connected to the second advance piece (5) and the other end connected to the surface of the umbrella (32), and an open end of the surface of the umbrella (32) is in the form of a shrunk memory; wherein, when the thrombus retaining mesh (2) is released, the opening of the overflow prevention umbrella (3) is pushed in open condition by the thrombus retaining mesh retaining port (2); and wherein, when the thrombus retaining mesh (2) is returned, the surface of the umbrella (32) of the overflow prevention umbrella (3) covers the retaining port of the thrombus retaining mesh (2 ), and the open end of the umbrella surface (32) is compressed to prevent thrombus leakage.
    [0002]
    2. THROMBUS FILTER according to claim 1, characterized in that both the thrombus retention net (2) and the overflow prevention umbrella (3) are in a net structure, and the network is made of an alloy with memory.
    [0003]
    3. THROMBUS FILTER according to claim 1, characterized in that the thrombus retention net (2) is a net structure, and the overflow prevention umbrella (3) consists of a guard support (31) and a coating film with filter pores coated on the umbrella holder (31), and the umbrella holder (31) is fabricated from a memory alloy.
    [0004]
    4. THROMBUS FILTER according to claim 1, characterized in that the thrombus retention network (2) is in a network structure, the surface of the umbrella (32) of the overflow prevention umbrella (3) be in the form of a net, the umbrella support (31) is a support rod connected to the surface of the umbrella (32), and the surface of the umbrella (32) is fabricated from an alloy with memory.
    [0005]
    5. THROMBUS FILTER according to claim 1, characterized in that the thrombus retention network (2) consists of a structure and a coating film with filter pores coated on the structure, the surface of the umbrella ( 32) of the overflow prevention umbrella (3) having the form of a net, the umbrella support (31) being a support rod connected to the surface of the umbrella (32), and the surface of the umbrella rain (32) be manufactured from a memory alloy.
    [0006]
    6. THROMBO FILTER, according to any one of claims 1 to 5, characterized in that the second advance piece (5) has a tubular shape, and the second advance piece (5) is provided in a sliding sleeve on the first infeed piece (4) and coaxially arranged with the first infeed piece (4).
    [0007]
    7. THROMBO FILTER according to claim 6, characterized in that the first advance piece (4) has a tubular shape, and the hollow portion inside the first tubular advance piece (4) forms a transport channel.
    [0008]
    8. THROMBO FILTER according to claim 1, characterized in that the surface of the umbrella (32) has a circular shape, and the outer edge of the circular shape is connected to the umbrella support (31).
    [0009]
    9. THROMBUS FILTER, according to claim 1, characterized in that one end of the thrombus retention network (2) is a retention port and the other end of the same is a bottom of the network, and the bottom part of the net being extended inside the sheath (1) and connected to the first advance piece (4).
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    法律状态:
    2018-11-21| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-12-10| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-05-11| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-06-15| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 14/10/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    CN201210484480.4A|CN102973332B|2012-11-23|2012-11-23|Thrombus filter and using method thereof|
    CN201210484480.4|2012-11-23|
    PCT/CN2013/085167|WO2014079291A1|2012-11-23|2013-10-14|Blood clot filter and utilization method thereof|
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