A thrombus fragmentation and rotary cutting structure and a thrombus fragmentation device

Abstract

The present invention provides a thrombus fragmentation and rotary cutting structure and a thrombus fragmentation device, which relates to the technical field of thrombus fragmentation medical devices and includes a push-pull rod and a cutting assembly. The push-pull rod is used to pass through an outer tube, and the distal end of the push-pull rod has a spiral structure; the cutting assembly includes a tool holder and a cutting tool. The tool holder is sleeved outside the spiral structure and is in spiral cooperation with the spiral structure. The cutting tool is fixed on the tool holder and is used for cutting thrombus, and the cutting tool has a compression and reset function; when the push-pull rod moves axially and the tool holder is axially limited, the tool holder and the cutting tool rotate; by providing a spiral structure on the push-pull rod and using the cooperation between the spiral structure and the cutting tool, the present invention can drive the cutting tool to rotate to achieve the resection of thrombus by pushing or pulling the push-pull rod. The structure is simple and the operation is convenient. Moreover, the cutting tool has a compression and reset function and can contract into the outer tube, avoiding the problem that the cutting tool cuts the blood vessel during the insertion or removal process.

Description

Technical Field

[0001] The present invention relates to the technical field of thrombus fragmentation medical devices, and particularly relates to a thrombus fragmentation rotary cutting structure and a thrombus fragmentation device. Background Art

[0002] Thrombus is mainly caused by atherosclerotic plaque, atrial thrombus detachment, etc., which lead to vascular stenosis or occlusion, slow blood flow, and changes in blood viscosity. With the continuous development of minimally invasive surgery, methods such as catheter-directed thrombolysis and percutaneous mechanical thrombectomy are used in the treatment of thrombus removal.

[0003] Among them, catheter-directed thrombolysis is to place a thrombolytic catheter into a venous thrombus, and the thrombolytic drug acts directly on the thrombus through the thrombolytic catheter, which can significantly improve the dissolution rate of the thrombus and reduce the incidence of sequelae of venous thrombus. It belongs to drug thrombolysis. However, this method is prone to major bleeding problems for patients with thrombolysis and anticoagulation contraindications, and the applicable population is limited. Percutaneous mechanical thrombectomy is to puncture percutaneously and place a special catheter into the blood vessel lumen, and remove the thrombus by cutting and aspirating with a tool at the end of the special catheter. It belongs to mechanical thrombolysis, and its applicable population is wider. However, the high-speed rotating cutter head may damage the inner wall of the blood vessel, causing complications such as inflammation, intimal hyperplasia, or perforation.

[0004] Therefore, it is necessary to develop a thrombus fragmentation device to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a thrombus fragmentation rotary cutting structure and a thrombus fragmentation device to solve the problems existing in the above prior art. By setting a spiral structure on the push-pull rod and cooperating the spiral structure with the cutter, the cutter can be driven to rotate by pushing or pulling the push-pull rod to achieve thrombus resection. The structure is simple and the operation is convenient. Moreover, the cutter has a compression and reset function and can contract into the outer tube, avoiding the problem of the cutter cutting the blood vessel during insertion or removal.

[0006] To achieve the above purpose, the present invention provides the following solution:

[0007] A thrombus fragmentation rotary cutting structure includes a push-pull rod and a cutting assembly. The push-pull rod is used to penetrate through an outer tube, and the distal end of the push-pull rod has a spiral structure. The cutting assembly includes a tool holder and a cutter. The tool holder is sleeved outside the spiral structure and is in spiral cooperation with the spiral structure. The cutter is fixed on the tool holder and is used for cutting thrombus. The cutter has a compression and reset function and can contract into the outer tube under the limiting action of the outer tube. When the push-pull rod moves axially and the tool holder is axially limited, the tool holder and the cutter rotate.

[0008] As an embodiment, at least two cutting blades are uniformly arranged along the circumferential direction of the tool holder.

[0009] As an embodiment, a distal limit protrusion and a proximal limit protrusion are arranged on the push-pull rod. The distal limit protrusion and the proximal limit protrusion are respectively arranged on the distal side and the proximal side of the spiral structure, and are used to prevent the cutting assembly from disengaging from the spiral structure.

[0010] As an embodiment, a clamping protrusion is further arranged on the push-pull rod along the radial direction. The clamping protrusion is located on the distal side of the proximal limit protrusion, and a clamping groove for clamping and cooperating with the clamping protrusion is arranged on the proximal end face of the tool holder.

[0011] As an embodiment, the clamping groove is spiral.

[0012] The present invention also provides a thrombus fragmentation device, including: the thrombus fragmentation and cutting structure as described above, a traction wire, and a filtering component. The push-pull rod in the thrombus fragmentation and cutting structure is a hollow structure; the traction wire is arranged inside the push-pull rod; the filtering component includes a framework and a filter net. The framework is coaxially arranged with the traction wire. The distal end of the framework is slidably connected with the traction wire, the proximal end of the framework is fixedly connected with the traction wire, the filter net is arranged on the framework, and the mesh opening of the filter net faces the proximal side for collecting thrombus fragments; the framework has a compression and reset function, and under the compression of the push-pull rod, the framework can retract into the push-pull rod.

[0013] As an embodiment, a guiding head is further included, and the guiding head is coaxially fixed at the distal end of the traction wire.

[0014] As an embodiment, an outer tube is further included. The outer tube has a double-layer tube wall structure. The cavity inside the inner tube wall is a rod-passing cavity for passing the push-pull rod. The space between the inner tube wall and the outer tube wall is an infusion cavity, and a liquid spraying port communicated with the infusion cavity is arranged on the outer tube wall.

[0015] As an embodiment, a catheter seat is further included. The proximal end of the outer tube is fixedly connected with the catheter seat. The catheter seat is provided with a first channel and a second channel. The first channel is coaxially arranged with the outer tube. A proximal end of the first channel is threadedly connected with an operating handle. A fixing hole for fixedly connecting the push-pull rod is arranged in the operating handle, and an opening for the traction wire to pass through is arranged at the proximal end of the operating handle; the second channel is communicated with the infusion cavity for injecting thrombolytic liquid medicine.

[0016] As an embodiment, it further includes a sealing plug and a fixing cover. From far to near, the diameter of the opening gradually increases. The shape of the sealing plug is adapted to the diameter of the opening. An inner hole is coaxially provided in the middle of the sealing plug. The sealing plug is inserted into the opening. A ring flange is provided at the proximal end of the sealing plug, and the diameter of the ring flange is greater than the diameter of the opening. The fixing cover is threadedly connected to the proximal end of the operating handle, pressing the ring flange against the opening. An inner protrusion extending toward the distal side is coaxially provided in the middle of the fixing cover, and the inner protrusion is inserted into the inner hole. A tapered channel is provided in the inner protrusion, and from far to near, the inner diameter of the tapered channel gradually increases.

[0017] The present invention has the following technical effects compared with the prior art:

[0018] By providing a spiral structure on the push-pull rod and cooperating the spiral structure with the cutter, the present invention can drive the cutter to rotate to achieve the resection of thrombus by pushing or pulling the push-pull rod. The structure is simple and the operation is convenient. Moreover, by manually pushing or pulling the push-pull rod by the staff, it is easier to control the rotation speed and rotary cutting condition of the cutter, and the possibility of the cutter damaging blood vessels can be reduced. In addition, the cutter in the present invention is made of shape memory alloy and has a compression and reset function, and can shrink into the outer tube, avoiding the problem of the cutter cutting the blood vessels during the insertion or removal process.

[0019] The other technical solutions in the present invention also have the following technical effects compared with the prior art:

[0020] A clamping protrusion is provided on the push-pull rod in the present invention, and a clamping groove is provided on the proximal end surface of the tool holder. After the clamping protrusion and the clamping groove are clamped and matched, the tool holder and the cutter can be driven to rotate by rotating the push-pull rod, increasing the cutting force and being beneficial to the resection of old and stubborn thrombus. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of the push-pull rod in an embodiment of the present invention;

[0023] Figure 2 It is a schematic structural diagram of the cutting assembly in an embodiment of the present invention;

[0024] Figure 3 It is a schematic structural diagram of the cooperation between the push-pull rod and the operating handle in an embodiment of the present invention;

[0025] Figure 4 Structural schematic diagram of the traction wire, the guiding head end, and the filter assembly (in the contracted state) in an embodiment of the present invention;

[0026] Figure 5 Structural schematic diagram of the traction wire, the guiding head end, and the filter assembly (in the expanded state) in an embodiment of the present invention;

[0027] Figure 6 Structural schematic diagram of the cooperation between the outer tube and the catheter seat in an embodiment of the present invention;

[0028] Figure 7 is Figure 6 Partial enlarged view of area A in

[0029] Figure 8 Structural schematic diagram of the sealing plug in an embodiment of the present invention;

[0030] Figure 9 Structural schematic diagram of the fixing cover in an embodiment of the present invention;

[0031] Figure 10 Structural schematic diagram of the thrombus fragmentation device in an embodiment of the present invention (both the filter assembly and the cutting assembly are in the contracted state);

[0032] Figure 11 Structural schematic diagram of the thrombus fragmentation device in an embodiment of the present invention (both the filter assembly and the cutting assembly are in the expanded state);

[0033] Figure 12 Structural schematic diagram of the thrombus fragmentation device placed in a thrombus in an embodiment of the present invention;

[0034] Figure 13 Structural schematic diagram of the thrombus fragmentation device for thrombus fragmentation and thrombolysis in an embodiment of the present invention.

[0035] Explanation of reference numerals:

[0036] 1. Push-pull rod; 11. Spiral structure; 12. Distal limit protrusion; 13. Proximal limit protrusion; 14. Clamping protrusion;

[0037] 2. Cutting assembly; 21. Knife seat; 22. Cutter; 23. Clamping groove;

[0038] 3. Traction wire;

[0039] 4. Filter assembly;

[0040] 5. Guiding head;

[0041] 6. Outer tube; 61. Inner layer tube wall; 62. Outer layer tube wall; 63. Rod passing cavity; 64. Liquid injection cavity; 65. Imaging ring;

[0042] 7. Catheter seat; 71. First channel; 72. Second channel;

[0043] 8. Operating handle; 81. Fixing hole;

[0044] 9. Sealing plug;

[0045] 10. Fixing cover; 101. Inner protrusion;

[0046] 102. Reinforcing tube;

[0047] 103. Thrombus. Detailed implementation manners

[0048] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0049] The purpose of the present invention is to provide a thrombus fragmentation and rotary cutting structure and a thrombus fragmentation device to solve the problems existing in the prior art. By providing a spiral structure on the push-pull rod and cooperating the spiral structure with the cutting knife, the cutting knife can be driven to rotate by pushing or pulling the push-pull rod to achieve the resection of the thrombus. The structure is simple and the operation is convenient. Moreover, the cutting knife has a compression and reset function and can be retracted into the outer tube, avoiding the problem that the blood vessel is cut during the insertion or removal of the cutting knife.

[0050] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0051] Embodiment 1:

[0052] As Figures 1 to 13 shown, this embodiment provides a thrombus fragmentation and rotary cutting structure, including a push-pull rod 1 and a cutting assembly 2. The push-pull rod 1 is used to pass through an outer tube 6. The distal end of the push-pull rod 1 has a spiral structure 11. The cutting assembly 2 includes a tool holder 21 and a cutting knife 22. The tool holder 21 is sleeved outside the spiral structure 11 and is in spiral cooperation with the spiral structure 11. The cutting knife 22 is fixed on the tool holder 21 and is used for cutting the thrombus 103. The cutting knife 22 has a compression and reset function and can be made of a shape memory alloy, such as nickel-titanium alloy. The cutting knife 22 can be retracted into the outer tube 6 under the limiting action of the outer tube 6 and expand when exposed from the outer tube 6. When the push-pull rod 1 moves axially and the tool holder 21 is axially limited, the tool holder 21 and the cutting knife 22 rotate. In this embodiment, the proximal end refers to the end close to the operator of the operation, and the distal end refers to the end far from the operator of the operation, that is, the end close to the patient.

[0053] During use, place the push rod 1, cutting assembly 2, and outer tube 6 at the position of the thrombus 103 in the blood vessel. The cutter 22 can be on the distal side, proximal side, or inside the thrombus 103. Pull the outer tube 6 proximally to expose the cutter 22 outside the outer tube 6, and the cutter 22 unfolds after losing the restrictive effect of the outer tube 6. The staff holds the distal end of the push rod 1 and pushes or pulls the push rod 1. If the cutter 22 is on the distal side of the thrombus 103, pull the push rod 1; if the cutter 22 is on the proximal side of the thrombus 103, push the push rod 1. Taking the cutter 22 being on the distal side of the thrombus 103 and pulling the push rod 1 as an example, when pulling the push rod 1 backward, the cutter 22 will move toward the proximal side along with the push rod 1. Since the diameter of the cutter 22 after being fully unfolded is slightly smaller than the inner diameter of the blood vessel, the cutter 22 will abut against the thrombus 103 when moving toward the proximal side, and the thrombus 103 will block the cutter 22 from continuing to move toward the proximal side. At this time, when the staff appropriately increases the force and continues to pull the push rod 1, the cutter 22 rotates under the drive of the spiral structure 11 to cut the thrombus 103, achieving the purpose of eliminating the thrombus 103. When the cutter 22 is on the proximal side of the thrombus 103, just push the push rod 1 distally. At this time, the cutter 22 rotates in the reverse direction to cut the thrombus 103. When the cutter 22 is in the middle of the thrombus 103, the cutter 22 may not be able to be fully unfolded initially under the limiting effect of the thrombus 103. The staff can repeatedly push or pull the push rod 1 to cut the thrombus 103 with the cutter 22 and gradually unfold the cutter 22. After the thrombus 103 is removed, push the outer tube 6, and the cutter 22 contracts into the outer tube 6, then take out the outer tube 6 and the thrombus-removing rotary cutting structure.

[0054] Thus, in this embodiment, by setting the spiral structure 11 on the push rod 1 and using the cooperation between the spiral structure 11 and the cutter 22, the thrombus 103 can be removed by driving the cutter 22 to rotate by pushing or pulling the push rod 1. The structure is simple and the operation is convenient. Moreover, by manually pushing or pulling the push rod 1 by the staff, it is easier to control the rotation speed and rotary cutting situation of the cutter 22, and the possibility of the cutter 22 damaging the blood vessel can be reduced. In addition, in this embodiment, the cutter 22 is made of shape memory alloy and has a compression and reset function, and can contract into the outer tube 6, avoiding the problem of the cutter 22 cutting the blood vessel during insertion or removal.

[0055] In order to further reduce the possibility of the cutter 22 cutting the blood vessel, in this embodiment, the corners of the cutter 22 all have an arc transition structure.

[0056] In this embodiment, the middle of the tool holder 21 has a through hole for the bolt structure to pass through, and the through hole can be the spiral structure 11.

[0057] In this embodiment, at least two cutting blades 22 are evenly arranged along the circumferential direction of the tool holder 21. Two cutting blades 22 can be provided, and the cutting blade 22 can be in the shape of a propeller blade.

[0058] In this embodiment, a distal limiting protrusion 12 and a proximal limiting protrusion 13 are arranged on the push-pull rod 1. The distal limiting protrusion 12 and the proximal limiting protrusion 13 are respectively arranged on the distal side and the proximal side of the spiral structure 11, and the diameters of both are larger than the diameter of the through hole, so as to prevent the cutting assembly 2 from disengaging from the spiral structure 11.

[0059] As Figure 2 shown, in this embodiment, a clamping protrusion 14 is also arranged on the push-pull rod 1 along the radial direction. The clamping protrusion 14 is located on the straight rod section of the push-pull rod 1, between the proximal limiting protrusion 13 and the distal end of the spiral structure 11. A clamping groove 23 for clamping and cooperating with the clamping protrusion 14 is arranged on the proximal end face of the tool holder 21. The clamping protrusion 14 is located on the straight pipe section of the push-pull rod 1. For the old and stubborn thrombus 103, it may not be possible to drive the cutting blade 22 to cut the old and stubborn thrombus 103 by operating the push-pull rod 1. At this time, ensuring that the cutting blade 22 is under the axial limiting effect, rotate the push-pull rod 1. When the push-pull rod 1 rotates, it moves towards the distal side, and finally the clamping protrusion 14 is clamped and fixed with the clamping groove 23. Then, the staff rotates the push-pull rod 1, and directly drives the cutting blade 22 to rotate through the push-pull rod 1, increasing the cutting force of the cutting blade 22, so as to achieve the purpose of cutting the old and stubborn thrombus 103.

[0060] In order to prevent the clamping protrusion 14 from easily disconnecting from the clamping groove 23, in this embodiment, the clamping groove 23 is spiral.

[0061] Embodiment 2:

[0062] As Figures 1 to 13As shown in the figure, this embodiment provides a thrombus fragmentation device, which includes the thrombus fragmentation and cutting structure in Embodiment 1, a traction wire 3, and a filter assembly 4. The push-pull rod 1 in the thrombus fragmentation and cutting structure is a hollow structure; the traction wire 3 is arranged inside the push-pull rod 1; the filter assembly 4 includes a framework and a filter net. The framework is coaxially arranged with the traction wire 3. The distal end of the framework is slidably connected to the traction wire 3, and the proximal end of the framework is fixedly connected to the traction wire 3. The filter net is arranged on the framework, and the mesh opening of the filter net faces the proximal side for collecting thrombus 103 fragments; the framework has a compression and reset function and can be made of a shape memory alloy, such as nickel-titanium alloy. Under the compression of the push-pull rod 1, the framework can retract into the push-pull rod 1. In this embodiment, the middle part of the framework has a position with the largest radial cross-section. Both the distal side part and the proximal side part of the framework at this position are conical structures; from far to near, the diameter of the distal side part gradually increases, and the diameter of the proximal side part gradually decreases. The filter net is fixed on the distal side part, and the mesh opening of the filter net faces the proximal side. The filter net can be a woven structure or a filter membrane with filter holes. When placed in a blood vessel, the framework shrinks in the push-pull rod 1. After reaching the position of the thrombus 103, first push the traction wire 3 to push the framework to the distal side of the thrombus 103. After the framework is no longer restricted by the push-pull rod 1, it unfolds and can collect small thrombus 103 fragments to avoid distal thrombus 103 embolism caused by thrombus 103 fragments.

[0063] As Figure 4 , Figure 5 shown in the figure, this embodiment further includes a guiding head 5. The guiding head 5 is coaxially fixed to the distal end of the traction wire 3 and is used to form a channel on the thrombus 103 for components such as an outer tube 6 to pass through the thrombus 103. In this embodiment, the guiding head 5 is made of a coiled spring, specifically a coiled spring made of a radio-opaque metal wire through processing. It can be visualized under X-ray to determine its position. A ball head processed by laser or plasma is provided on its proximal end face to play a guiding role. Its distal end is connected and fixed to the proximal end of the traction wire 3 by forms such as tin soldering or glue bonding.

[0064] As Figure 6 , Figure 7 shown in the figure, this embodiment further includes an outer tube 6. The outer tube 6 has a double-layer tube wall structure. The cavity inside the inner tube wall 61 is a rod-passing cavity 63 for passing through the push-pull rod 1. Between the inner tube wall 61 and the outer tube wall 62 is an injection cavity 64. The outer tube wall 62 is provided with injection nozzles communicating with the injection cavity 64. The injection nozzles are distributed in multiple numbers along the axial and circumferential directions of the outer tube wall 62. By providing the injection cavity 64, thrombolytic drugs can be injected into the thrombus 103 to improve the removal effect of the thrombus 103.

[0065] The distal side of the double-layer tube wall structure has a single-layer tube structure, and the single-layer tube structure can provide a larger contraction space for the cutter 22. Imaging rings 65 are provided at both the distal and proximal ends of the single-layer tube structure to facilitate observing the position of the outer tube 6 and the action range of the thrombolytic drug.

[0066] As shown Figure 9 in the figure, in this embodiment, a catheter seat 7 is further included. The proximal end of the outer tube 6 is fixedly connected to the catheter seat 7. A reinforcing tube 102 is also fixedly connected to the proximal end of the catheter seat 7. The proximal end of the outer tube 6 is located inside the reinforcing tube 102. The reinforcing tube 102 is used to prevent the outer tube 6 from being bent and damaged at the connection position with the catheter seat 7. A first channel 71 and a second channel 72 are provided on the catheter seat 7. The first channel 71 is coaxially arranged with the outer tube 6. An operating handle 8 is threadedly connected to the proximal end of the first channel 71. A fixing hole 81 is provided in the operating handle 8. The proximal end of the push-pull rod 1 is fixed in the fixing hole 81. The proximal end of the operating handle 8 has an opening for the traction wire 3 to pass through. The staff can operate the push-pull rod 1 through the operating handle 8. The second channel 72 is communicated with the injection cavity 64 and is used for injecting thrombolytic liquid medicine.

[0067] As shown Figures 8 to 10 in the figure, in this embodiment, a sealing plug 9 and a fixing cover 10 are further included. From far to near, the diameter of the opening gradually becomes larger. The shape of the sealing plug 9 is adapted to the diameter of the opening. An inner hole is coaxially arranged in the middle of the sealing plug 9. The sealing plug 9 is inserted into the opening. A circular flange is provided at the proximal end of the sealing plug 9. The diameter of the circular flange is larger than the diameter of the opening. The fixing cover 10 is threadedly connected to the proximal end of the operating handle 8 to press the circular flange against the opening. An inner protrusion 101 extending towards the distal side is coaxially arranged in the middle of the fixing cover 10. The inner protrusion 101 is inserted into the inner hole. A tapered channel is provided in the inner protrusion 101. From far to near, the inner diameter of the tapered channel gradually becomes larger. The inner protrusions 101 in the sealing plug 9 and the fixing cover 10 are both made of flexible materials. When the sealing plug 9 is inserted into the opening and the inner protrusion 101 on the fixing table is inserted into the inner hole of the sealing plug 9, the inner protrusion 101 and the sealing plug 9 cooperate to clamp and fix the traction wire 3 in the inner protrusion 101, ensuring the integrity of the thrombus fragmentation device when it is sent into the blood vessel. When the thrombus fragmentation device reaches the position of the thrombus 103 in the blood vessel, the fixing cover 10 and the sealing plug 9 are loosened, so that the traction wire 3 is no longer fixedly connected to the operating handle 8. By operating the traction wire 3, the filter net can be driven out. After the filter net is unfolded, ensure that the traction wire 3 does not move, and perform thrombus fragmentation operation by operating the push-pull rod 1 through the operating handle 8.

[0068] Adaptations made according to actual needs are within the protection scope of the present invention.

[0069] In the present invention, specific examples are used to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. At the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A thrombus fragmentation device, characterized in that, Comprising: A thrombus fragmentation and rotary cutting structure, which includes a push-pull rod and a cutting assembly. The push-pull rod is used to pass through the outer tube, and the distal end of the push-pull rod has a spiral structure; the cutting assembly includes a tool holder and a cutting tool. The tool holder is sleeved outside the spiral structure and is in spiral cooperation with the spiral structure. The cutting tool is fixed on the tool holder for cutting thrombus. The cutting tool has a compression and reset function and can shrink into the outer tube under the limiting action of the outer tube; when the push-pull rod moves axially and the tool holder is axially limited, the tool holder and the cutting tool rotate. The push-pull rod in the thrombus fragmentation and rotary cutting structure is a hollow structure; A traction wire, which is passed through the push-pull rod; A filtering assembly, which includes a framework and a filter net. The framework is coaxially arranged with the traction wire. The distal end of the framework is slidably connected to the traction wire, and the proximal end of the framework is fixedly connected to the traction wire. The filter net is arranged on the framework, and the mesh opening of the filter net faces the proximal side for collecting thrombus fragments; The framework has a compression and reset function. Under the compression of the push-pull rod, the framework can retract into the push-pull rod.

2. The thrombus fragmentation device according to claim 1, characterized in that At least two cutting tools are evenly arranged circumferentially along the tool holder.

3. The thrombus fragmentation device according to claim 1, wherein The push-pull rod is provided with a distal limit protrusion and a proximal limit protrusion, which are respectively arranged on the distal side and the proximal side of the spiral structure to prevent the cutting assembly from disengaging from the spiral structure.

4. The thrombus fragmentation device according to claim 3, characterized in that The push-pull rod is further provided with a clamping protrusion along the radial direction. The clamping protrusion is located on the distal side of the proximal limit protrusion. A clamping groove for clamping and cooperating with the clamping protrusion is arranged on the proximal end face of the tool holder.

5. The thrombus fragmentation device according to claim 4, characterized in that, The clamping groove is spiral.

6. The thrombus fragmentation device according to claim 1, characterized in that It further includes a guiding head, which is coaxially fixed to the distal end of the traction wire.

7. The thrombus fragmentation device according to claim 1, characterized in that, It further includes an outer tube, which has a double-layer tube wall structure. The cavity inside the inner tube wall is a rod-passing cavity for passing the push-pull rod. The space between the inner tube wall and the outer tube wall is an injection cavity, and a liquid spraying port communicated with the injection cavity is arranged on the outer tube wall.

8. The thrombus fragmentation device according to claim 7, characterized in that, It further includes a catheter seat. The proximal end of the outer tube is fixedly connected to the catheter seat. The catheter seat is provided with a first channel and a second channel. The first channel is coaxially arranged with the outer tube. A proximal end of the first channel is threadedly connected with an operating handle, and a fixing hole for fixedly connecting the push-pull rod is arranged in the operating handle. An opening for the traction wire to pass through is arranged at the proximal end of the operating handle; the second channel is communicated with the injection cavity for injecting thrombolytic liquid medicine.

9. The thrombus fragmentation device according to claim 8, characterized in that, It further includes a sealing plug and a fixing cover. From far to near, the diameter of the opening gradually increases. The shape of the sealing plug is adapted to the diameter of the opening. An inner hole is coaxially provided in the middle of the sealing plug. The sealing plug is inserted into the opening. A circular flange is provided at the proximal end of the sealing plug, and the diameter of the circular flange is greater than the diameter of the opening. The fixing cover is threadedly connected to the proximal end of the operating handle, pressing the circular flange against the opening. An inner protrusion extending towards the distal side is coaxially provided in the middle of the fixing cover, and the inner protrusion is inserted into the inner hole. A tapered channel is provided in the inner protrusion, and from far to near, the inner diameter of the tapered channel gradually increases.

Images