Thrombus breaking structure and thrombus separating device

Abstract

The utility model provides a thrombus breaking structure and a thrombus separating device, and relates to the technical field of medical instruments, the thrombus breaking structure comprises a skeleton and a covering film, the skeleton is used for breaking a thrombus, and the near end and the far end of the skeleton are both used for being connected with a guide wire; the covering film is laid on the framework, and the far end of the covering film is fixedly connected with the far end of the framework; the covering film is of a conical structure with the diameter gradually increased from far to near under the supporting effect of the framework, and filtering holes capable of filtering thrombus are formed in the covering film. By arranging the covering film on the framework, thrombus blocks can be captured, and the situation that thrombus blocks escape to cause embolism at other positions of blood vessels is avoided; and after the thrombus blocks are captured by the covering film, the captured and concentrated thrombus blocks can be conveniently sucked by the suction catheter, so that the thrombus suction separation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a thrombus fragmentation structure and a thrombus separation device. Background Technology

[0002] Peripheral vascular disease, particularly arterial and venous thrombosis, has always been a significant challenge in clinical treatment. These diseases not only cause pain, swelling, and functional impairment in patients, but can also be life-threatening in severe cases. Thrombus formation obstructs blood flow, leading to tissue ischemia and organ damage; therefore, effective thrombus removal is crucial for treating these diseases.

[0003] Traditional methods of thrombus removal mainly include drug therapy and open surgery. However, drug therapy often has limited effectiveness and carries the risk of complications such as bleeding; while open surgery is highly invasive, has a slow recovery time, and a high complication rate. With the continuous advancement of medical technology, interventional therapy, as a minimally invasive and highly effective treatment method, has gradually become an important means of treating peripheral vascular diseases.

[0004] In interventional therapy, thrombectomies, as an innovative treatment tool, provide doctors with more precise and efficient treatment methods. The inventors understand that the main function of the thrombectomy device in a thrombectomy is to cut and break up the thrombus. Combined with accessories such as a negative pressure suction pump, the broken thrombus is efficiently removed. However, the broken thrombus is in a free state, resulting in low efficiency in suction removal; moreover, the thrombus may escape, meaning it cannot be suctioned and travels along the blood vessel to other locations, causing embolism at the distal end of the vessel.

[0005] Therefore, it is necessary to develop a new thrombus breaker to solve the above-mentioned technical problems. Utility Model Content

[0006] The purpose of this invention is to provide a thrombus fragmentation structure and a thrombus separation device to solve the problems existing in the prior art. By setting a membrane on the skeleton, thrombus fragments can be captured, preventing thrombus fragments from escaping and causing embolism in other parts of the blood vessel. Moreover, after the membrane captures the thrombus fragments, it is convenient for the aspiration catheter to aspirate the captured and concentrated thrombus fragments, thereby improving the efficiency of thrombus aspiration and separation.

[0007] To achieve the above objectives, this utility model provides the following solution:

[0008] A thrombus fragmentation structure includes a skeleton and a covering membrane. The skeleton is used for fragmenting thrombi, and both the proximal and distal ends of the skeleton are used to connect guidewires. The covering membrane is applied to the skeleton, and the distal end of the covering membrane is fixedly connected to the distal end of the skeleton. The covering membrane has a tapered structure with a gradually increasing diameter from the distal to the proximal end under the support of the skeleton, and the covering membrane is provided with filter pores capable of filtering thrombi.

[0009] In one embodiment, the diameter of the middle part of the skeleton is larger than the diameters of both ends, and the proximal end of the covering film is connected to the middle part of the skeleton.

[0010] As one embodiment, the axial distance from the distal end of the skeleton to the position of the maximum diameter in the middle is smaller than the axial distance from the proximal end of the skeleton to the position of the maximum diameter in the middle.

[0011] In one embodiment, the skeleton is made of nickel-titanium alloy; both ends of the skeleton are used for fixed connection with the guide wire.

[0012] As one embodiment, the coating is made of polyurethane material.

[0013] As one embodiment, the coating is adhered to the skeleton.

[0014] This utility model also provides a thrombus separation device, including an aspiration catheter, a thrombus fragmentation structure as described above, and a guidewire. The proximal end of the aspiration catheter is used to connect to a negative pressure aspiration device, and the distal end is used to aspirate the thrombus. The guidewire is connected to the skeleton in the thrombus fragmentation structure, and the guidewire is used to place the thrombus fragmentation structure at the thrombus location from inside the aspiration catheter.

[0015] As one embodiment, a proximal imaging ring is provided at the proximal connection position between the skeleton and the guidewire, and a distal imaging ring is provided at the distal connection position between the skeleton and the guidewire.

[0016] In one embodiment, the skeleton is made of nickel-titanium alloy; both ends of the skeleton are used for fixed connection with the guide wire; the maximum diameter of the middle part of the skeleton is not less than the diameter of the aspiration catheter.

[0017] As one embodiment, the distal end of the guidewire has a rounded head structure.

[0018] This utility model has the following technical advantages over the prior art:

[0019] In this invention, the thrombus-fracture structure utilizes a framework to cut and fragment the thrombus, forming free thrombus fragments in the blood. These fragments are then aspirated and separated using a suction catheter. The conical structure formed by the membrane captures the thrombus fragments, preventing them from escaping and causing embolism in other parts of the blood vessel. Furthermore, the membrane's capture of the thrombus fragments facilitates suction of the concentrated fragments, thereby improving the efficiency of thrombus aspiration and separation. When the suction catheter becomes blocked, axial movement of the thrombus-fracture structure within the catheter can also help clear the blockage, ensuring the proper functioning of the thrombus separation process.

[0020] Other technical effects that this invention can achieve compared to the prior art are described in the specific embodiments. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the break-bolt structure installed on the guide wire in one embodiment of the present invention;

[0023] Figure 2 for Figure 1 A structural diagram from another perspective;

[0024] Figure 3 This is a schematic diagram of the process of separating thrombi using a thrombus separation device in one embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Skeleton; 11. Distal side filament; 12. Proximal side filament; 13. Connecting filament; 2. Coating; 3. Filter pores; 4. Guide wire; 5. Suction guide tube; 6. Distal imaging ring; 7. Proximal imaging ring; 8. Round head structure. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] The purpose of this invention is to provide a thrombus fragmentation structure and a thrombus separation device to solve the problems existing in the prior art. By setting a membrane on the skeleton, thrombus fragments can be captured, preventing thrombus fragments from escaping and causing embolism in other parts of the blood vessel. Moreover, after the membrane captures the thrombus fragments, it is convenient for the aspiration catheter to aspirate the captured and concentrated thrombus fragments, thereby improving the efficiency of thrombus aspiration and separation.

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1:

[0031] like Figures 1-3 As shown, this embodiment provides a thrombus fragmentation structure, including a framework 1 and a covering 2. The framework 1 is spindle-shaped and specifically includes a distal wire 11, a proximal wire 12, and a connecting wire 13. The distal end of the distal wire 11 and the proximal end of the proximal wire 12 are both used to connect to the guide wire 4. The proximal ends of the distal wire 11 and the proximal ends of the proximal wire 12 are staggered in the circumferential direction and connected by the connecting wire 13. During axial movement, the framework 1 can use the distal wire 11, proximal wire 12, and connecting wire 13 to cut the thrombus and achieve the thrombus fragmentation function. The covering 2 is applied to the framework 1, mainly onto the distal wire 11. The distal end of the covering 2 is fixedly connected to the distal end of the framework 1, and the proximal end is connected to the middle of the framework 1. Under the support of the framework 1, the covering 2 has a tapered structure with a gradually increasing diameter from distal to proximal. The membrane 2 is provided with filter holes 3 that can filter blood clots but allow blood to flow.

[0032] In this embodiment, the distal end refers to the end furthest from the surgeon, and the proximal end refers to the end closest to the surgeon.

[0033] In this embodiment, the thrombus fragmentation structure utilizes the framework 1 to cut and fragment the thrombus, forming thrombus masses free in the blood. The aspiration catheter 5 then aspirates and separates these thrombus masses. The conical structure formed by the membrane 2 captures the thrombus masses, preventing them from escaping and causing embolism in other parts of the blood vessel. Furthermore, the membrane 2's capture of the thrombus masses facilitates aspiration of the concentrated thrombus masses by the aspiration catheter 5, thereby improving the efficiency of thrombus aspiration and separation. When the aspiration catheter 5 becomes blocked, axial movement of the thrombus fragmentation structure within it can also help clear the blockage, ensuring the normal progress of the thrombus separation process.

[0034] In one embodiment, the diameter of the middle part of the skeleton 1 is larger than the diameters of both ends. The middle part of the skeleton 1 may have a constant diameter segment, the diameter of which is the maximum diameter of the skeleton 1. The location of the maximum diameter in the skeleton 1 may also be the location of a radial cross section. In this embodiment, the maximum diameter of the skeleton 1 is located at the proximal end of the distal filament 11. In this embodiment, the proximal end of the covering 2 is laid to the proximal end of the distal filament 11, ensuring that the conical structure formed by the covering 2 has a large opening diameter, thereby improving the capture effect on thrombi.

[0035] As one implementation, after the skeleton 1 is unfolded, the axial length of the distal filament 11 is less than the axial length of the proximal filament 12. That is, the axial distance from the distal end of the skeleton 1 to the position of the maximum diameter in the middle is less than the axial distance from the proximal end of the skeleton 1 to the position of the maximum diameter in the middle. This makes the conical structure formed by the membrane 2 have a relatively small depth (axial height of the conical structure), which facilitates the aspiration catheter 5 to aspirate the thrombus captured in the membrane 2.

[0036] In one embodiment, the skeleton 1 is made of nickel-titanium alloy and can have two states: retracted and extended. In the retracted state, it is convenient to store the thrombus fragments; in the extended state, the skeleton 1 can perform the functions of fragmenting thrombi and capturing thrombus clots. The two ends of the skeleton 1 are used for welding and fixing to the guidewire 4.

[0037] As one embodiment, the coating 2 is made of polyurethane material and can be fixed to the distal side filament 11 of the skeleton 1 by adhesive bonding.

[0038] Example 2:

[0039] like Figures 1-3 As shown, this embodiment provides a thrombus separation device, including an aspiration catheter 5, the thrombus fragmentation structure in Embodiment 1, and a guide wire 4. The proximal end of the aspiration catheter 5 is used to connect to a negative pressure aspiration device, and the distal end is used to insert into the affected area of ​​the blood vessel to aspirate the fragmented thrombus. The guide wire 4 is connected to the skeleton 1 in the thrombus fragmentation structure, and the guide wire 4 is used to place the thrombus fragmentation structure at the thrombus location from inside the aspiration catheter 5.

[0040] In this embodiment, the skeleton 1 is made of nickel-titanium alloy, and its maximum diameter in the deployed state is not less than the diameter of the aspiration catheter 5. When the skeleton 1 is located in the aspiration catheter 5, it is in a contracted state. When it reaches the affected blood vessel, the skeleton 1 protrudes from the distal end of the aspiration catheter 5, and the aspiration catheter 5 loses its restraining effect on the skeleton 1. Since the skeleton 1 is made of shape memory alloy, the skeleton 1 will return to the deployed state. Then, by pushing, pulling, and rotating the guidewire 4, the skeleton 1 can be used to break up the thrombus (mainly the proximal side wire 12 and connecting wire 13 of the skeleton 1).

[0041] In one embodiment, a proximal imaging ring 7 is provided at the proximal connection position between the skeleton 1 and the guidewire 4, and a distal imaging ring 6 is provided at the distal connection position between the skeleton 1 and the guidewire 4. Both the proximal imaging ring 7 and the distal imaging ring 6 are metal rings made of platinum-iridium alloy and are fixed to the guidewire 4 by forging. Their function is to be visible under radiation, making it easier for the surgeon to identify the position of the skeleton 1.

[0042] As one implementation, the distal end of the guidewire 4 has a rounded head structure 8, which makes it easier for the distal end of the guidewire 4 to be inserted into the thrombus and can also avoid the problem of the guidewire 4 tip accidentally touching the inner wall of the blood vessel and causing scratches to the inner wall of the blood vessel.

[0043] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0044] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A type of bolt-breaking structure, characterized in that, include: A skeleton, the skeleton being used to break up thrombi, with both the proximal and distal ends of the skeleton being used to connect to a guidewire; The membrane is applied to the skeleton, and the distal end of the membrane is fixedly connected to the distal end of the skeleton. The membrane has a tapered structure with a gradually increasing diameter from the distal end to the proximal end under the support of the skeleton, and the membrane is provided with filter pores that can filter thrombi.

2. The bolt-breaking structure according to claim 1, characterized in that, The diameter of the middle part of the skeleton is larger than the diameter of both ends, and the proximal end of the covering film is connected to the middle part of the skeleton.

3. The bolt-breaking structure according to claim 2, characterized in that, The axial distance from the distal end of the skeleton to the position of the maximum diameter in the middle is less than the axial distance from the proximal end of the skeleton to the position of the maximum diameter in the middle.

4. The bolt-breaking structure according to any one of claims 1 to 3, characterized in that, The skeleton is made of nickel-titanium alloy; both ends of the skeleton are used for fixed connection with the guide wire.

5. The bolt-breaking structure according to claim 4, characterized in that, The coating is made of polyurethane material.

6. The bolt-breaking structure according to claim 5, characterized in that, The coating is bonded to the skeleton.

7. A thrombus separation device, characterized in that, include: Aspiration catheter, the proximal end of which is used to connect to a negative pressure aspiration device, and the distal end of which is used to aspirate thrombi; The briquetted structure as described in any one of claims 1 to 6; And a guidewire connected to the skeleton in the fragmentation structure, the guidewire being used to place the fragmentation structure at the thrombus location from inside the aspiration catheter.

8. The thrombus separation device according to claim 7, characterized in that, A proximal imaging ring is provided at the proximal connection position between the skeleton and the guidewire, and a distal imaging ring is provided at the distal connection position between the skeleton and the guidewire.

9. The thrombus separation device according to claim 7, characterized in that, The skeleton is made of nickel-titanium alloy; both ends of the skeleton are used for fixed connection with the guide wire; the maximum diameter of the middle part of the skeleton is not less than the diameter of the aspiration catheter.

10. The thrombus separation device according to claim 7, characterized in that, The distal end of the guidewire has a rounded head structure.

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