Thrombus extraction stent and venous sinus thrombus extraction device

Abstract

The utility model provides a thrombectomy stent and a venous sinus thrombectomy device. The thrombectomy stent has a compression state of radial contraction and an expansion state of radial expansion. When the thrombectomy stent is in an expansion state, the cross section of the thrombectomy stent is triangular; the thrombus extraction stent in an expanded state can better adapt to a venous sinus blood vessel structure, is more attached to a blood vessel wall, and can fully strip and cut a venous sinus thrombus attached to the blood vessel wall, so that the thrombus breaking effect and the thrombus extraction efficiency are improved, and meanwhile, the damage to the blood vessel wall is reduced; meanwhile, when thrombus extraction is completed and the thrombus extraction stent is withdrawn, the thrombus extraction stent can better adapt to the vein sinus vascular structure and can smoothly pass through the triangular narrow position of the straight sinus, and thrombus escape caused by difficult passing is avoided.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a thrombus removal bracket and a venous sinus thrombus removal device having the thrombus removal bracket. Background Art

[0002] Cerebral venous sinus thrombosis (CVST) is a special type of cerebrovascular disease, which is usually more common in children and young adults. The incidence of CVST is less than 1% of all strokes. The "Guidelines for the Clinical Management of Cerebrovascular Diseases in China (Excerpt Edition) - Clinical Management of Cerebral Venous Thrombosis" provides guidance on the prevention, diagnosis, evaluation and standardized treatment of CVST. For the treatment of CVST, the standard recommended method is traditional drug therapy, and for patients whose symptoms cannot be relieved or further aggravated, the guidelines also recommend the use of vascular intervention for intervention treatment.

[0003] Currently, there is no dedicated venous sinus thrombectomy device on the market, and arterial thrombectomy devices are mostly used for venous sinus thrombectomy in clinical practice. However, due to the special vascular structure of the venous sinus, such as the triangular cross-sectional shape of the blood vessels at the straight sinus, the thrombectomy stent in the traditional arterial thrombectomy device is difficult to adapt to the vascular environment of the cerebral venous sinus, resulting in a series of problems such as difficult surgical operation, difficulty in breaking up hard thrombi, low thrombectomy efficiency, and high postoperative complications. Utility Model Content

[0004] The utility model aims to provide a thrombus removal bracket and a venous sinus thrombus removal device having the thrombus removal bracket.

[0005] In order to solve the above problems, the utility model provides a thrombus retrieval stent, which has a radially contracted compressed state and a radially expanded expanded state; when the thrombus retrieval stent is in the expanded state, the cross-section of the thrombus retrieval stent is triangular.

[0006] As an optional technical solution, along the axial direction of the thrombus retrieval stent, the thrombus retrieval stent includes a plurality of sub-thrombus retrieval stents arranged at intervals, and a connecting piece connecting two adjacent sub-thrombus retrieval stents, wherein the connecting piece has a through hole passing through the axial direction of the thrombus retrieval stent; when the thrombus retrieval stent is in an expanded state, the cross-section of the sub-thrombus retrieval stent is triangular.

[0007] As an optional technical solution, the triangle is a rounded triangle.

[0008] As an optional technical solution, the triangle is an equilateral triangle.

[0009] As an optional technical solution, the sub-thrombectomy stent includes a main body section and connecting sections located at opposite ends of the main body section; the connecting sections are tapered in a direction away from the main body section.

[0010] As an optional technical solution, the thrombus retrieval stent includes at least three sub-thrombus retrieval stents arranged at intervals; and the lengths of the connecting pieces connecting two adjacent sub-thrombus retrieval stents are the same.

[0011] As an optional technical solution, along the axial direction of the thrombus removal stent, the thrombus removal stent includes a working section and an auxiliary section, and the length of the connecting member located in the working section is greater than the length of the connecting member located in the auxiliary section.

[0012] As an optional technical solution, the connecting member is a developing member.

[0013] As an optional technical solution, the thrombus removal stent is a developing stent; or the thrombus removal stent is at least one of a woven stent and a carved stent.

[0014] To achieve the above-mentioned purpose, the utility model also provides a venous sinus thrombectomy device, including a delivery rod, a control handle connected to the proximal end of the delivery rod, the above-mentioned thrombectomy bracket connected to the distal end of the delivery rod, a guide wire that is passed through the delivery rod and the thrombectomy bracket and whose proximal end is connected to the control handle and controlled by the control handle, the distal end of the thrombectomy bracket is connected to the distal end of the guide wire, and the proximal end of the thrombectomy bracket is connected to the distal end of the delivery rod.

[0015] Compared with the prior art, the thrombectomy stent in the utility model sets the cross-section of the thrombectomy stent in the expanded state to be triangular. Therefore, when the venous sinus thrombectomy device with the thrombectomy stent performs an interventional thrombectomy for venous sinus thrombosis, the thrombectomy stent in the expanded state can better adapt to the vascular structure of the venous sinus and fit more closely to the vascular wall, so as to more fully peel off and cut the venous sinus thrombus that is closely attached to the vascular wall, thereby improving the thrombus fragmentation effect and thrombus removal efficiency and reducing damage to the vascular wall. At the same time, when the thrombectomy is completed and withdrawn, the thrombectomy stent can also better adapt to the vascular structure of the venous sinus and can smoothly pass through the narrow triangular part of the straight sinus, thus avoiding the escape of thrombus due to difficulty in passing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the venous sinus thrombectomy device in the first embodiment of the present invention (including the thrombectomy bracket in the first embodiment of the present invention);

[0017] Figure 2 It is a schematic structural diagram of a venous sinus thrombectomy device in the second embodiment of the present invention (including the thrombectomy bracket in the second embodiment of the present invention);

[0018] Figure 3 It is a schematic structural diagram of a venous sinus thrombectomy device in the third embodiment of the present invention (including the thrombectomy bracket in the third embodiment of the present invention). DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with specific implementation methods and drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0020] The words expressing positions and directions described in the present invention are all based on the instrument operator as a reference, the end close to the instrument operator is the proximal end, and the end far from the instrument operator is the distal end.

[0021] Please refer to Figure 1 As shown, the utility model provides a thrombus removal bracket 3 and a venous sinus thrombus removal device 10 having the thrombus removal bracket 3. The venous sinus thrombus removal device 10 comprises a delivery rod 1, a control handle 2 connected to the proximal end of the delivery rod 1, a thrombus removal bracket 3 connected to the distal end of the delivery rod 1, a guide wire (not numbered) penetrating the delivery rod 1 and the thrombus removal bracket 3 and connected to the control handle 2 at the proximal end and controlled by the control handle 2, the distal end of the thrombus removal bracket 3 is connected to the distal end of the guide wire, and the proximal end of the thrombus removal bracket 3 is connected to the distal end of the delivery rod 1. When the venous sinus thrombectomy device 10 performs an interventional thrombectomy, the thrombectomy stent 3 is pushed distally by the operating handle 2, so that the thrombectomy stent 3 is in a compressed state of axial stretching and radial contraction, which is convenient for the delivery of the thrombectomy stent 3 in the catheter; after the thrombectomy stent 3 is deep in the distal end of the catheter and delivered to the thrombus in the venous sinus, the thrombectomy stent 3 is pulled proximally by the operating handle 2, so that the thrombectomy stent 3 switches to an expanded state of axial compression and radial expansion. During the expansion process of the thrombectomy stent 3, the thrombectomy stent 3 cuts the thrombus and breaks it up, so that the thrombus can enter the interior of the thrombectomy stent 3 through the grid on the thrombectomy stent 3, thereby capturing the thrombus. Finally, the thrombectomy stent 3 is controlled by the operating handle 2 to be reset to the compressed state and retracted into the catheter again, and the thrombus is removed from the human blood vessel by withdrawing the catheter from the blood vessel in the human body.

[0022] When the thrombus removal stent 3 is in an expanded state, the cross section of the thrombus removal stent 3 is triangular. Therefore, when the venous sinus thrombus removal device 10 performs an interventional thrombus removal surgery for venous sinus thrombosis, the thrombus removal stent 3 in an expanded state can better adapt to the venous sinus vascular structure, fit more closely to the vascular wall, and can more fully peel and cut the venous sinus thrombus that is close to the vascular wall, thereby improving the thrombus fragmentation effect and thrombus removal efficiency, while reducing damage to the vascular wall; at the same time, when the thrombus removal is completed and withdrawn, the thrombus removal stent 3 can also better adapt to the venous sinus vascular structure, and can smoothly pass through the triangular narrow part of the straight sinus, thereby avoiding the escape of thrombus due to the difficulty of passing.

[0023] Furthermore, the triangle is a rounded triangle, which can prevent the apex of the expanded thrombectomy stent 3 from scratching the blood vessels and is also conducive to the thrombectomy stent 3 to better adapt to the venous sinus vascular structure.

[0024] Specifically, the curvature of each rounded corner of the rounded triangle is not greater than 5. Of course, this is not limited to this.

[0025] It is known that the curvature of each rounded corner of the rounded triangle cannot be designed to be too small, so as to avoid affecting the fitting effect between the thrombus removal stent 3 in the expanded state and the blood vessel wall.

[0026] In a specific implementation, the triangle is an equilateral triangle, but of course, it is not limited thereto.

[0027] Furthermore, the thrombectomy stent 3 is a developing stent, which is convenient for the operator to observe the position and expansion of the thrombectomy stent 3 during the operation.

[0028] Specifically, the material of the thrombus removal stent 3 is a material with development properties such as a nickel-titanium-platinum composite material, a platinum-tungsten alloy, etc. Of course, this is not limited to the above, and the thrombus removal stent 3 can also be set as a non-development stent. In this case, the material of the thrombus removal stent 3 can be a superelastic or non-superelastic alloy material such as a nickel-titanium alloy, stainless steel, and a cobalt-chromium alloy.

[0029] Specifically, the thrombus removal bracket 3 can be a braided bracket, or the thrombus removal bracket 3 can be a braided bracket along its axial part, and the other part can be a braided bracket, or the thrombus removal bracket 3 can be configured to include a braided bracket and a braided bracket, and the braided bracket is sleeved on the distal end section of the braided bracket. For example, the thrombus removal bracket 3 can be configured to have the proximal section and the distal section be a braided bracket, so as to improve the adaptability of the middle section of the thrombus removal bracket 3 and avoid the difficulty of expansion of the thrombus removal bracket 3; or the thrombus removal bracket 3 can be configured to have the proximal section be a braided bracket with a dense mesh density at the distal end, so as to improve the effect of the distal end of the thrombus removal bracket 3 to prevent the thrombus from escaping. It is known that the molding structure of the thrombus removal bracket 3 can be configured according to the specific functional requirements of the thrombus removal bracket 3, and no more examples are given here.

[0030] Combination Figure 1 As shown, in the first embodiment of the utility model, the thrombectomy stent 3 is a single longer thrombectomy stent 3. Specifically, the thrombectomy stent 3 includes a main body section 31, and connecting sections 32 located at opposite ends of the main body section 31. The connecting sections 32 are tapered in the direction away from the main body section 31. The connecting section 32 at the proximal end of the main body section 31 is connected to the delivery rod 1, and the connecting section 32 at the distal end of the main body section 31 is connected to the guide wire. It can be seen that the cross-section of the thrombectomy stent 3 is triangular when the thrombectomy stent 3 is in the expanded state, which means that the cross-section of the main body section 31 is triangular. When the thrombectomy stent 3 is in the expanded state, the cross-sectional shape of the connecting section 32 is not limited here.

[0031] Combination Figure 2 As shown, the thrombectomy stent 3a in the second embodiment of the present invention and the venous sinus thrombectomy device 10a having the thrombectomy stent 3a are shown. The difference between the thrombectomy stent 3a in the second embodiment of the present invention and the thrombectomy stent 3 in the first embodiment is that: along the axial direction of the thrombectomy stent 3a, the thrombectomy stent 3a includes a plurality of sub-thrombectomy stents 3' arranged at intervals, and a connecting member 33 connecting two adjacent sub-thrombectomy stents 3', and the connecting member 33 has a through hole penetrating along the axial direction of the thrombectomy stent 3. At this time, the cross section of the thrombectomy stent 3a is triangular when the thrombectomy stent 3a is in the expanded state, which means that the cross section of the sub-thrombectomy stent 3' is triangular when the thrombectomy stent 3a is in the expanded state. Compared with the thrombectomy stent 3 in the first embodiment, the thrombectomy stent 3a in the second embodiment of the present invention has more cross sections, so that there are more opportunities to contact with the thrombus during the process of thrombectomy, which can improve the efficiency of the thrombectomy stent 3a in thrombectomy. At the same time, the gap between two adjacent sub-thrombectomy stents 3' can accommodate the thrombus that has been stripped off, thereby improving the thrombectomy effect.

[0032] In a specific embodiment, the connecting member 33 is a developing member, but this is not limiting.

[0033] Specifically, each sub-thrombectomy stent 3' comprises a main body section 31a and connecting sections 32a at opposite ends of the main body section 31a; the connecting sections 32a are tapered in a direction away from the main body section 31a, which facilitates the connection between the sub-thrombectomy stent 3' at the proximal end and the delivery rod 1, the connection between the sub-thrombectomy stent 3' at the distal end and the guide wire, and the connection between each sub-thrombectomy stent 3' and the corresponding connecting piece 33, and at the same time, facilitates the stripped thrombus to enter the gap between adjacent sub-thrombectomy stents 3'.

[0034] It is known that the material and molding structure of each sub-thrombectomy stent 3 ′ can be the same as the material and molding structure of the thrombectomy stent 3 in the first embodiment, and will not be described in detail here.

[0035] In this embodiment, the thrombus retrieval bracket 3a includes at least three sub-thrombus retrieval brackets 3' arranged at intervals; the lengths of the connecting pieces 33 connecting two adjacent sub-thrombus retrieval brackets 3' are the same, that is, the intervals between at least three sub-thrombus retrieval brackets 3' are the same.

[0036] Except for the above differences, the second embodiment of the present invention is the same as the first embodiment in other aspects, and will not be described in detail herein.

[0037] Combination Figure 3 The figure shows a thrombectomy stent 3b in the third embodiment of the present invention and a venous sinus thrombectomy device having the thrombectomy stent 3b. The difference between the thrombectomy stent 3b in the third embodiment of the present invention and the thrombectomy stent 3a in the second embodiment is that the length of the connector 33b connecting two adjacent sub-thrombectomy stents 3' is different. Specifically, along the axial direction of the thrombectomy stent 3b, the thrombectomy stent 3b is defined to include a working section and an auxiliary section. The length of the connector 33b located in the working section is greater than the length of the connector 33b located in the auxiliary section, which can improve the compliance of the thrombectomy stent 3b located in the working section, improve the passability of the thrombectomy stent 3b through tortuous and complex blood vessels, and improve the effect of thrombus fragmentation and thrombus removal; at the same time, it can also improve the thrombus capture effect of the thrombectomy stent 3b in the auxiliary section to prevent thrombus escape.

[0038] In a specific embodiment, the auxiliary segment refers to the distal segment of the thrombectomy stent 3b, and the working segment refers to the proximal segment of the thrombectomy stent 3b except the distal segment. Figure 3 As shown, in this embodiment, the thrombectomy bracket 3b includes five sub-thrombectomy brackets 3', the four thrombectomy brackets 3' at the proximal end correspond to the working section, and the sub-thrombectomy bracket 3' at the distal end corresponds to the auxiliary section, so that the length of the three connecting members 33b between the four thrombectomy brackets 3' at the proximal end is greater than the length of the connecting member 33b connected to the sub-thrombectomy bracket 3' at the distal end. Of course, this is not limited to this.

[0039] Specifically, the length of the connecting piece 33b located in the working section is 2 mm to 5 mm, and the length of the connecting piece 33b located in the auxiliary section is 1 mm to 2 mm. Of course, this is not limited thereto.

[0040] The third embodiment of the present invention is the same as the second embodiment except for the above differences, and will not be described in detail herein.

[0041] In summary, the thrombus removal stents 3, 3a, 3b in the utility model are configured such that the cross-section of the thrombus removal stents 3, 3a, 3b in the expanded state is triangular. Thus, when the venous sinus thrombus removal device 10 having the thrombus removal stents 3, 3a, 3b performs an interventional thrombus removal surgery for venous sinus thrombosis, the thrombus removal stents 3, 3a, 3b in the expanded state can better adapt to the vascular structure of the venous sinus and fit more closely to the vascular wall, so as to more fully peel off and cut the venous sinus thrombus that is closely attached to the vascular wall, thereby improving the thrombus fragmentation effect and thrombus removal efficiency and reducing damage to the vascular wall. At the same time, when the thrombus removal is completed and withdrawn, the thrombus removal stent 3 can also better adapt to the vascular structure of the venous sinus and can smoothly pass through the narrow triangular part of the straight sinus, thus avoiding the escape of thrombus due to difficulty in passing.

[0042] The present invention has been described by the above-mentioned relevant embodiments, but the above-mentioned embodiments are only examples for implementing the present invention. In addition, the technical features involved in the different embodiments of the present invention described above can be combined with each other as long as they do not conflict with each other. It must be pointed out that the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should all belong to the protection scope of the claims attached to the present invention.

Claims

1. A thrombus removal stent, the thrombus removal stent having a radially contracted compressed state and a radially expanded expanded state; characterized in that: The thrombus retrieval stent includes a main body section and connecting sections located at opposite ends of the main body section. When the thrombus retrieval stent is in an expanded state, the cross-section of the thrombus retrieval stent is triangular, and the connecting sections are tapered in a direction away from the main body section.

2. The thrombus removal stent according to claim 1, characterized in that: Along the axial direction of the thrombus retrieval bracket, the thrombus retrieval bracket includes a plurality of sub-thrombus retrieval brackets arranged at intervals, and a connecting piece connecting two adjacent sub-thrombus retrieval brackets, wherein the connecting piece has a through hole penetrating along the axial direction of the thrombus retrieval bracket; each of the sub-thrombus retrieval brackets includes the main body segment and the connecting segments located at opposite ends of the main body segment, and when the thrombus retrieval bracket is in an expanded state, the cross-section of the sub-thrombus retrieval bracket is triangular.

3. The thrombus removal stent according to claim 1 or 2, characterized in that: The triangle is a rounded triangle.

4. The thrombus removal stent according to claim 1 or 2, characterized in that: The triangle is an equilateral triangle.

5. The thrombus removal stent according to claim 2, characterized in that: The thrombus retrieval bracket includes at least three sub-thrombus retrieval brackets arranged at intervals; the lengths of the connecting pieces connecting two adjacent sub-thrombus retrieval brackets are the same.

6. The thrombus removal stent according to claim 2, characterized in that: Along the axial direction of the thrombus retrieval stent, the thrombus retrieval stent includes a working section and an auxiliary section, and the length of the connecting member located in the working section is greater than the length of the connecting member located in the auxiliary section.

7. The thrombus removal stent according to claim 2, characterized in that: The connecting member is a developing member.

8. The thrombus removal stent according to claim 1, characterized in that: The thrombus removal stent is a developing stent; or the thrombus removal stent is at least one of a woven stent and a carved stent.

9. A venous sinus thrombectomy device, comprising a delivery rod, a control handle connected to the proximal end of the delivery rod, a thrombectomy bracket connected to the distal end of the delivery rod, and a guide wire passing through the delivery rod and the thrombectomy bracket and connected to the control handle at the proximal end and controlled by the control handle, the distal end of the thrombectomy bracket being connected to the distal end of the guide wire, and the proximal end of the thrombectomy bracket being connected to the distal end of the delivery rod; Features: The thrombus retrieval stent is the thrombus retrieval stent according to any one of claims 1 to 8.

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