Device for cleaning thrombus in blood vessel

Abstract

The intravascular thrombus cleaning device comprises a handle, a mesh basket, a catheter, a soft head and a core wire, the mesh basket is fusiform and is of a double-layer structure, the mesh basket comprises an inner supporting frame and a woven mesh arranged on the outer side of the inner supporting frame in a sleeving mode, and the two ends of the inner supporting frame and the two ends of the woven mesh are connected in an aligned mode. The inner support frame comprises at least three nickel-titanium ribs which are uniformly distributed along the axial lead of the mesh basket, one end of the core wire penetrates through the inner support frame and the woven mesh and is connected with the soft head, the other end of the core wire is inserted into the handle in a drawable manner, when the core wire is pulled by external force, the soft head moves to extrude the inner support frame, so that the nickel-titanium ribs are arched outwards to expand the woven mesh, and when the external force is removed, the soft head is pulled out. The nickel-titanium ribs are reset and pushed back to the soft head, so that the woven mesh is shrunk, enough supporting force can be kept through the inner supporting frame, deformation of the woven mesh is avoided, thrombus can be intercepted through small meshes of the woven mesh, escape is avoided, the dragging effect is improved, and the woven mesh can be expanded to different degrees by changing the pulling degree of the core wire.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to an intravascular thrombus removal device. Background Technology

[0002] A thrombus is a solid mass formed when blood coagulates within the heart and blood vessels of a living body, or when certain precipitates in the blood aggregate and remain lodged in the blood vessels. This thrombus can easily lead to peripheral vascular thrombotic diseases such as deep vein thrombosis (DVT) and arterial thromboembolism (ATE). Deep vein thrombosis and the pulmonary embolism (PE) it causes are the third leading cause of vascular disease after acute coronary syndrome and ischemic stroke, with an annual incidence rate as high as 0.1%, posing a serious burden on society and becoming a major global health problem.

[0003] Currently, the main treatments for thrombosis include anticoagulation therapy, local thrombectomy, and mechanical thrombectomy. Among these, mechanical thrombectomy, performed using a thrombus removal device, is the most convenient, has a direct therapeutic effect, and is the most widely used. This type of thrombus removal device mainly relies on a self-expanding basket set on a basket delivery tube to cut and drag the thrombus to complete the thrombus removal. For example, Chinese patent CN112494104A discloses such a device. However, when the basket adopts a cutting structure, the mesh is too large, making it difficult to filter thrombi. At the same time, the support force is too large, which can easily damage the vascular intima. When a braided structure is adopted, the strength and support force are low, which can easily lead to dragging deformation, poor adhesion to the wall, and thrombus escape, resulting in poor thrombus removal effect. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an intravascular thrombus removal device with good thrombus removal effect.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is an intravascular thrombus removal device, comprising:

[0006] handle;

[0007] Net basket;

[0008] A conduit connecting one end of the basket to the handle;

[0009] A flexible head located at the other end of the basket;

[0010] A core wire threaded inside the catheter;

[0011] The basket is spindle-shaped and has a double-layer structure. The basket includes an inner support frame and a woven mesh sleeved on the outside of the inner support frame. The two ends of the inner support frame and the woven mesh are aligned and connected. The inner support frame includes at least three nickel-titanium reinforcing bars distributed along the axis of the basket. One end of the core wire is connected to the end of the inner support frame and the woven mesh near the flexible head, and the other end is detachably inserted into the handle. When the core wire is pulled by an external force, the core wire squeezes the inner support frame, causing the nickel-titanium reinforcing bars to arch outward and expand the woven mesh. When the external force is removed, the nickel-titanium reinforcing bars return to their original position and push the core wire back, causing the woven mesh to contract.

[0012] Preferably, the nickel-titanium rib is a square rib, and the side width of the nickel-titanium rib is 0.05-0.3mm.

[0013] Preferably, the nickel-titanium rib is straight, or the nickel-titanium rib has one or more S-shaped bends.

[0014] Preferably, the woven mesh is woven from multiple strands of filaments, the diameter of which is 0.01-0.1 mm and the weaving angle of which is 40-140°.

[0015] More preferably, the nickel-titanium reinforcing bar extends spirally around its axis, and the spiral angle of the nickel-titanium reinforcing bar is equal to the braiding angle.

[0016] More preferably, the braided wire includes nickel-titanium alloy wire, cobalt-chromium alloy wire, and platinum-containing nickel-titanium wire.

[0017] Preferably, both the inner support frame and the woven mesh are coated with an anti-condensation coating.

[0018] Preferably, the handle includes a housing, a tube seat fixed inside the housing, a slider slidably disposed inside the housing, and a sliding button connected to the slider for driving the slider to slide. The tube seat is a hemostatic valve structure. The end of the catheter is fixed to the tube seat. A fixing block is provided inside the slider. The core wire passes through the slider and is riveted to the fixing block. When the sliding button drives the slider to slide, the slider can pull the core wire through the fixing block, causing the basket to expand.

[0019] More preferably, the handle further includes a stress diffusion tube, an extension tube, and a three-way valve. The stress diffusion tube passes through the housing, with one end abutting against the tube seat and the other end extending outward. The conduit passes through the stress diffusion tube. One end of the extension tube is connected to the three-way valve, and the other end is connected to the tube seat.

[0020] Preferably, the catheter is fitted with a suction catheter, which is equipped with a hemostatic valve and a suction port.

[0021] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0022] The intravascular thrombus removal device provided by this utility model includes a handle, a basket, a catheter connecting one end of the basket to the handle, a flexible tip located at the other end of the basket, and a core wire inserted inside the catheter. The basket is shaped like a shuttle and has a double-layered structure, including an inner support frame and a woven mesh sleeved outside the inner support frame. The two ends of the inner support frame and the woven mesh are aligned and connected. The inner support frame includes at least three nickel-titanium reinforcing bars evenly distributed along the axis of the basket. One end of the core wire passes through the inner support frame and the woven mesh and connects to the flexible tip, while the other end can be pulled out and inserted. Located inside the handle, when the mandrel is pulled by external force, the flexible head moves and squeezes the inner support frame, causing the nickel-titanium tendons to arch outward and expand the braided mesh. When the external force is removed, the nickel-titanium tendons return to their original position and push the flexible head back, causing the braided mesh to contract. This not only utilizes the inner support frame to maintain sufficient support and prevent the braided mesh from deforming, but also uses the fine mesh openings of the braided mesh to intercept thrombi, prevent escape, and improve the dragging effect. Furthermore, by changing the degree of mandrel pulling, different degrees of expansion of the braided mesh can be achieved, adapting to different sizes of blood vessels and improving the clearing effect on wall thrombi. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of a preferred embodiment of the present invention. The suction tube has been omitted for easier observation.

[0024] Figure 2 yes Figure 1 The main view diagram shows a cross-section of the handle.

[0025] Figure 3 yes Figure 2 A schematic diagram showing the aspiration catheter.

[0026] Figure 4 yes Figure 1 A 3D diagram of the Chinese net basket.

[0027] Figure 5 yes Figure 4 A three-dimensional schematic diagram of the inner support frame.

[0028] Figure 6 yes Figure 4 A three-dimensional schematic diagram of a woven mesh.

[0029] The components are as follows: 10. Handle; 11. Housing; 12. Tube seat; 13. Slider; 131. Fixing block; 14. Sliding button; 15. Stress diffusion tube; 16. Extension tube; 17. Three-way valve; 20. Basket; 21. Inner support frame; 211. Nickel-titanium reinforcing bar; 22. Braided mesh; 221. Braided wire; 30. Catheter; 31. Aspiration catheter; 311. Hemostatic valve; 312. Aspiration port; 40. Soft tip; 50. Core wire. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0031] like Figures 1 to 6 As shown, the intravascular thrombus removal device provided by this utility model includes: a handle 10, a basket 20, a catheter 30, a flexible tip 40, and a core wire 50. The catheter 30 connects one end of the basket 20 to the handle 10, the flexible tip 40 is located at the other end of the basket 20, and the core wire 50 passes through the catheter 30. The basket 20 is spindle-shaped and has a double-layer structure. The basket 20 includes an inner support frame 21 and a woven mesh 22 sleeved on the outside of the inner support frame 21. The two ends of the inner support frame 21 and the woven mesh 22 are aligned with each other. The inner support frame 21 includes multiple nickel-titanium reinforcing bars 211 distributed along the axis of the basket 20. One end of the core wire 50 is connected to the inner support frame 21 and the end of the woven mesh 22 near the flexible head 40, and the other end is detachably inserted into the handle 10. When the core wire 50 is pulled by an external force, the core wire 50 squeezes the inner support frame 21, causing the nickel-titanium reinforcing bars 211 to arch outward and expand the woven mesh 22. When the external force is removed, the nickel-titanium reinforcing bars 211 return to their original position under their own elasticity and push the core wire 50 back, causing the woven mesh 22 to shrink.

[0032] This intravascular thrombus removal device can maintain sufficient support by using an internal support frame to prevent deformation of the woven mesh, and can also use the fine mesh openings of the woven mesh to intercept thrombi, prevent escape and improve the dragging effect. Furthermore, by changing the degree of tension of the core wire, the woven mesh can be expanded to different degrees to adapt to different sizes of blood vessels and improve the removal effect on wall-attached thrombi.

[0033] In this embodiment, the nickel-titanium rib 211 is a square rib, and the side width of the nickel-titanium rib 211 is 0.05-0.3mm. Specifically, the cross-section of the nickel-titanium rib 211 is rectangular, with one side length of 0.05-0.3mm and the other side length of 0.06-0.2mm.

[0034] In this embodiment, there are 4 nickel-titanium reinforcing bars 211. In other embodiments, there may be 3 to 16 nickel-titanium reinforcing bars 211.

[0035] In this embodiment, the nickel-titanium rib 211 is made by laser cutting of nickel-titanium tube. After cutting, the product undergoes heat setting treatment and is generally spindle-shaped. The diameter at the maximum diameter point is consistent with the inner diameter of the woven mesh 22.

[0036] In this embodiment, the nickel-titanium rib 211 has multiple S-shaped bends to allow for axial extension after the external force is removed. In other embodiments, the nickel-titanium rib 211 may also be straight or have only one S-shaped bend.

[0037] In this embodiment, the woven mesh 22 is woven from multiple strands of braided wire 221. The diameter of the braided wire 221 is 0.01-0.1mm, and the braiding angle of the braided wire 221 is 40-140°. Preferably, the woven mesh 22 is woven from 16-96 strands of braided wire 221. The braided wire 221 can be nickel-titanium alloy wire, cobalt-chromium alloy wire, platinum-containing nickel-titanium wire, etc.

[0038] Furthermore, the nickel-titanium rib 211 extends spirally around its axis, and the spiral angle of the nickel-titanium rib 211 is equal to the braiding angle of the braided wire 221.

[0039] In this embodiment, both the inner support frame 21 and the woven mesh 22 are coated with an anti-condensation coating.

[0040] In this embodiment, the handle 10 includes a housing 11, a tube seat 12 fixed inside the housing 11, a slider 13 slidably disposed inside the housing 11, and a sliding button 14 connected to the slider 13 for driving the slider 13 to slide. The tube seat 12 is a hemostatic valve structure. The end of the catheter 30 inserted into the housing 11 is fixed to the tube seat 12. A fixing block 131 is provided inside the slider 13. The core wire 50 passes through the tube seat 12 and the slider 13 and is riveted to the fixing block 131. When the sliding button 14 drives the slider 13 to slide, the slider 13 can pull the core wire 50 through the fixing block 131, causing the basket 20 to expand. Specifically, the sliding button 14 and the slider 13 are assembled together. An interlocking structure is provided between the sliding button 14 and the housing 11. When the sliding button 14 is pressed, the sliding button 14 is unlocked from the housing 11. The interlocking structure can be implemented by a matching structure such as a slot and a pin, which is the prior art and will not be described in detail here.

[0041] In this embodiment, the handle also includes a stress diffusion tube 15, an extension tube 16, and a three-way valve 17. The stress diffusion tube 15 is inserted through the front end of the housing 11, with one end abutting against the tube seat 12 and the other end extending forward. The conduit 30 is inserted inside the stress diffusion tube 15. One end of the extension tube 16 is connected to the three-way valve 17, and the other end is connected to the tube seat 12.

[0042] In this embodiment, one end of the inner support frame 21 and the braided mesh 22 is welded to the end of the core wire 50. The welding method can be laser welding, polymer coating hot melt welding, etc. The other end is connected to the conduit 30. The connection method can be forging and pressing with a developing ring, or molecular coating hot melt welding.

[0043] In this embodiment, the flexible tip 40 can be a coiled spring structure or an injection molded part, bonded to the core wire 50 and close to the basket 20; further, the catheter 30 is fitted with a suction catheter 31, and the suction catheter 31 is provided with a hemostatic valve 311 and a suction port 312.

[0044] When in use, press the sliding button 14 and pull the slider 13 backward to expand the braided mesh 22 to the appropriate size. Release the sliding button 14 and pull the catheter 30 back in the aspiration catheter 31 to gradually bring the thrombus to the tip of the aspiration catheter 31 for aspiration. During this process, due to the support of the inner support frame 21, the braided mesh 22 will not deform in the opposite direction, which can ensure the dragging effect of the thrombus.

[0045] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An intravascular thrombus removal device, comprising: handle; Net basket; A conduit connecting one end of the basket to the handle; A flexible head located at the other end of the basket; A core wire threaded inside the catheter; Its features are: The basket is spindle-shaped and has a double-layer structure. The basket includes an inner support frame and a woven mesh sleeved on the outside of the inner support frame. The two ends of the inner support frame and the woven mesh are aligned and connected. The inner support frame includes at least three nickel-titanium reinforcing bars distributed along the axis of the basket. One end of the core wire is connected to the end of the inner support frame and the woven mesh near the flexible head, and the other end is detachably inserted into the handle. When the core wire is pulled by an external force, the core wire squeezes the inner support frame, causing the nickel-titanium reinforcing bars to arch outward and expand the woven mesh. When the external force is removed, the nickel-titanium reinforcing bars return to their original position and push the core wire back, causing the woven mesh to contract.

2. The intravascular thrombus removal device according to claim 1, characterized in that: The nickel-titanium reinforcing bar is a square bar, and the side width of the nickel-titanium reinforcing bar is 0.05-0.3mm.

3. The intravascular thrombus removal device according to claim 1, characterized in that: The nickel-titanium rib is straight, or the nickel-titanium rib has one or more S-shaped bends.

4. The intravascular thrombus removal device according to claim 1, characterized in that: The woven mesh is made of multiple strands of woven wire, the diameter of which is 0.01-0.1mm and the weaving angle of which is 40-140°.

5. The intravascular thrombus removal device according to claim 4, characterized in that: The nickel-titanium reinforcing bar extends spirally around its axis, and the spiral angle of the nickel-titanium reinforcing bar is equal to the braiding angle.

6. The intravascular thrombus removal device according to claim 4, characterized in that: The braided wires include nickel-titanium alloy wires, cobalt-chromium alloy wires, and platinum-containing nickel-titanium wires.

7. The intravascular thrombus removal device according to claim 1, characterized in that: Both the inner support frame and the woven mesh are coated with an anti-condensation coating.

8. The intravascular thrombus removal device according to claim 1, characterized in that: The handle includes a housing, a tube seat fixed inside the housing, a slider slidably disposed inside the housing, and a sliding button connected to the slider for driving the slider to slide. The tube seat has a hemostatic valve structure. The end of the catheter is fixed to the tube seat. A fixing block is provided inside the slider. The core wire passes through the slider and is riveted to the fixing block. When the sliding button drives the slider to slide, the slider can pull the core wire through the fixing block, causing the basket to expand.

9. The intravascular thrombus removal device according to claim 8, characterized in that: The handle also includes a stress diffusion tube, an extension tube, and a three-way valve. The stress diffusion tube passes through the housing, with one end abutting against the tube seat and the other end extending outward. The conduit passes through the stress diffusion tube. One end of the extension tube is connected to the three-way valve, and the other end is connected to the tube seat.

10. The intravascular thrombus removal device according to claim 1, characterized in that: The catheter is fitted with a suction catheter, which is equipped with a hemostatic valve and a suction port.

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