Hyperelastic intravascular thrombus removing instrument

Abstract

The invention relates to a superelastic intravascular thrombus removing instrument, and belongs to the technical field of medical instruments. The near end of the bracket connecting pipe is fixed with the operating handle; the movable pipe is movably arranged on the outer side of the support connecting pipe in a sleeving mode; the thrombolysis net basket comprises a plurality of capillary tubes which have elasticity and are connected with the movable tube, and the capillary tubes are provided with dosing holes; the expansion and contraction control component is used for controlling expansion and expansion or contraction and closing of the thrombolysis net basket; and the dosing mechanism is communicated with the plurality of capillary tubes and is used for inputting thrombolysis liquid medicine into the capillary tubes. According to the application, the mesh basket mechanical thrombus extraction and thrombolysis design is combined, so that the vascular injury can be reduced, the treatment cycle of administration and thrombolysis is shortened, and the surgical burden of a patient can be relieved.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to a super-elastic intravascular thrombus removal device. Background Art

[0002] Venous thromboembolism (VTE) refers to abnormal blood coagulation in the veins, which completely or incompletely blocks the blood vessels. It is a venous reflux disorder. Venous thromboembolism includes deep vein thrombosis (DVT) and pulmonary embolism (PE).

[0003] There are two main types of treatments for venous thromboembolism. One is to rely on drug anticoagulation and catheter-directed thrombolysis (CDT), that is, a thrombolytic catheter is inserted into the cavity through the venous thrombus, and the above-mentioned thrombolytic drugs are continuously infused locally to achieve venous thrombus dissolution; the other is surgical thrombectomy.

[0004] The biggest advantage of CDT is that it limits the thrombolytic drugs to the site of thrombus, with high local drug concentration and good thrombolytic effect. It also avoids excessive entry of thrombolytic drugs into the systemic circulation, leading to systemic bleeding complications. However, thrombolysis also has the following disadvantages: (1) It is an invasive procedure; (2) It requires an intravenous catheter to continuously administer thrombolytic drugs for 3 to 7 days, during which the patient needs to stay in bed and have poor tolerance; (3) Bleeding complications are prone to occur at the intravenous puncture site; (4) Due to the long-term administration of the drug, some thrombolytic drugs still enter the systemic circulation, especially when the thrombus is gradually dissolved, so systemic bleeding complications may also occur.

[0005] Traditional surgical thrombectomy is to make a wound on the blood vessel and remove the thrombus. This method is very traumatic, has poor thrombectomy effect, and can damage venous valves. It is now rarely used. At present, new surgical thrombectomy methods are mostly minimally invasive, such as percutaneous mechanical thrombectomy (PMT), which delivers the thrombectomy instrument to the site of thrombus formation, removes the thrombus through multiple actions of mechanical thrombus fragmentation, thrombolysis, and chemical thrombolysis, and then sucks the thrombus into the catheter and discharges it into a waste liquid bag outside the body. However, mechanical thrombectomy is based on physical or mechanical principles to remove thrombi, and the treatment process may cause damage to the blood vessel wall and venous valves. Moreover, the surgical operation is delicate and requires high technical skills from the doctor. In addition, whether it is indwelling thrombolysis or surgical thrombectomy, a filter needs to be implanted in advance to avoid pulmonary embolism (PE) caused by the detachment of large thrombi. Summary of the invention

[0006] In order to reduce vascular damage and shorten the treatment cycle, thereby alleviating the burden on patients, the present application provides a super-elastic intravascular thrombus removal device.

[0007] The present application provides a superelastic intravascular thrombus removal device, which adopts the following technical solution:

[0008] A superelastic intravascular thrombus removal device, comprising:

[0009] Operating handle;

[0010] A stent connecting tube, the proximal end of which is fixed to the operating handle;

[0011] A movable tube, which is movably sleeved on the outside of the bracket connecting tube;

[0012] The thrombolytic basket comprises a plurality of elastic capillaries connected to the movable tube, wherein the capillaries are provided with drug delivery holes;

[0013] An expansion and contraction control member is used to control the expansion and deployment or contraction and closure of the thrombolytic basket;

[0014] The drug delivery mechanism is connected to the plurality of capillaries and is used for delivering thrombolytic solution into the capillaries.

[0015] Optionally, a thrombus removal protection stent is provided at the distal end of the stent connecting tube, the thrombus removal protection stent is woven from multiple strands of memory alloy wires, and the thrombus removal protection stent is connected to an opening and closing control component for controlling its expansion and deployment or contraction and closure.

[0016] Optionally, the opening and closing control component includes a movable inner core and a control slider A, the movable inner core is movably arranged in the bracket connecting tube, the distal end of the thrombus removal protection bracket is fixed to the distal end of the movable inner core, the control slider A is slidably arranged on the operating handle, the proximal end of the movable inner core is fixed to the control slider A, a button A is slidably connected to the control slider A, a compression spring A is provided between the button A and the operating handle, an upper rack A is provided on the operating handle, and a lower rack A matched with the upper rack A is provided on the button A.

[0017] Optionally, the expansion and contraction control component includes a basket pushing tube and a control slider B, the basket pushing tube is arranged between the movable tube and the bracket connecting tube, the distal end of the thrombolytic basket is fixed to the distal end of the basket pushing tube, and the proximal end of the thrombolytic basket is fixed to the distal end of the movable tube. The control slider B is slidably arranged on the operating handle, the proximal end of the basket pushing tube is fixed to the control slider B, a button B is slidably connected to the control slider B, a compression spring B is provided between the button B and the operating handle, an upper rack B is provided on the operating handle, and a lower rack B matching the upper rack B is provided on the button B.

[0018] Optionally, the drug delivery mechanism includes a y-type valve A and an outer sheath tube, the y-type valve A includes a main tube A and a side branch tube A, one end of the side branch tube A is connected to the main tube A, and the other end is used to inject thrombolytic solution, the proximal end of the main tube A is fixed to the proximal outer wall of the movable tube, the distal end of the main tube A is fixed to the proximal outer wall of the outer sheath tube, the proximal ends of the multiple capillaries form an annular cavity, the distal end of the movable tube is fixed to the inner wall of the annular cavity, and the distal end of the outer sheath tube is fixed to the outer wall of the annular cavity.

[0019] Optionally, the outer side of the outer sheath is also provided with a suction mechanism for extracting the thrombus from the blood vessel and expelling it from the body.

[0020] Optionally, the suction mechanism includes a y-type valve B and a suction catheter, the y-type valve B includes a main tube B and a side branch tube B, one end of the side branch tube B is connected to the main tube B, and the other end is connected to a negative pressure suction component, the proximal end of the main tube B is fastened to the outer wall of the outer sheath tube, and the distal end of the main tube B is fixed to the proximal outer wall of the suction catheter.

[0021] Optionally, the negative pressure suction assembly includes a negative pressure connecting tube and a negative pressure suction syringe, one end of the negative pressure connecting tube is connected to the side branch tube B, and the other end is connected to the end of the negative pressure suction syringe, the negative pressure connecting tube is provided with a negative pressure valve switch, and the negative pressure suction syringe is provided with a syringe lock, and the syringe lock is used to lock the piston of the negative pressure suction syringe.

[0022] Optionally, the thrombolytic basket is arranged in a rugby ball shape, the distal ends of all the capillaries are closed and fixed on the distal outer wall of the basket pushing tube, and the proximal ends of the capillaries are connected and movably sleeved on the outer side of the basket pushing tube.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The thrombolytic basket in this application is composed of multiple capillaries, and multiple drug delivery holes are opened on the capillaries. Through the setting of the movable tube and the drug delivery mechanism, when the doctor is dealing with a thrombus that is difficult to clear, he can first use the injection of this application to dissolve the thrombus, and then use physical thrombectomy to remove most of the thrombus. In this way, the mechanical thrombectomy and thrombolysis design of the basket are combined, which not only avoids the damage to the inner wall of the blood vessel and the vascular valve caused by the direct use of physical thrombectomy, but also does not need to leave a thrombolytic catheter in the body, which greatly reduces the treatment cycle of drug delivery and thrombolysis and reduces the burden on patients.

[0025] 2. The present application can control the expansion and contraction of the thrombolytic basket through the expansion and contraction control component. When the thrombolytic basket is closed, it is convenient for the present application to enter the blood vessel; when the thrombolytic basket is expanded, it can cut the thrombus to form blood flow like a cutting balloon; and the thrombus can be broken up by moving the movable tube back and forth, which is beneficial to improving the efficiency of thrombectomy.

[0026] 3. A thrombus removal protection stent is provided at the distal end of the present application, and the doctor can control the expansion and contraction of the thrombus removal protection stent through an opening and closing control component, and the thrombus removal protection stent is woven from multiple strands of memory alloy wire. In this way, during the process of thrombolysis or mechanical thrombectomy by the doctor, small thrombi and normal blood can circulate normally in the veins and will not be blocked by the thrombus removal protection stent, but can effectively prevent larger thrombi from flowing through the veins to the pulmonary artery and causing pulmonary embolism. In this way, there is no need to make another incision in the neck to implant the filter before the thrombectomy or thrombolysis operation, which greatly saves the operation cost and operation time.

[0027] 4. This application can adjust the opening and closing of the protective thrombectomy stent and the thrombolytic basket according to the size of the inner wall of the blood vessel, so as to better fit the blood vessel wall to smoothly perform surgical treatment, and has a wide range of applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of a superelastic intravascular thrombus removal device according to an embodiment of the present application.

[0029] Figure 2 It is a cross-sectional view showing an embodiment of the present application.

[0030] Figure 3 yes Figure 2 A local enlarged schematic diagram of point A in the middle.

[0031] Figure 4 A cutaway view showing an operating handle in an embodiment of the present application.

[0032] Figure 5 A schematic diagram of the structure of the thrombolytic basket in an embodiment of the present application.

[0033] Explanation of reference numerals: 1. operating handle; 11. button A; 111. compression spring A; 112. lower rack A; 12. upper rack A; 13. button B; 131. compression spring B; 132. lower rack B; 14. upper rack B; 2. bracket connecting tube; 3. movable tube; 4. thrombolytic basket; 41. capillary tube; 411. drug delivery hole; 42. annular cavity; 5. expansion and contraction control member; 51. basket push tube; 52. control slider B; 6. thrombus removal protection bracket ; 7. Opening and closing control component; 71. Movable inner core; 72. Control slider A; 8. Dosing mechanism; 81. Y-type valve A; 811. Main pipe A; 812. Side branch pipe A; 82. Outer sheath; 9. Suction mechanism; 91. Y-type valve B; 911. Main pipe B; 912. Side branch pipe B; 92. Suction catheter; 93. Negative pressure suction assembly; 931. Negative pressure connecting pipe; 932. Negative pressure suction syringe; 933. Negative pressure valve switch; 934. Syringe lock. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-5 , further details of this application are given.

[0035] Example:

[0036] The present application embodiment discloses a super elastic intravascular thrombus removal device. Figure 1-3 A superelastic intravascular thrombus removal device comprises an operating handle 1, a stent connecting tube 2, a movable tube 3, a thrombolytic basket 4 and a contraction control component 5; wherein the proximal end of the stent connecting tube 2 is fixedly connected to the operating handle 1; the movable tube 3 is movably sleeved on the outside of the stent connecting tube 2; the thrombolytic basket 4 is connected to the distal end of the movable tube 3; the contraction control component is used to control the expansion and deployment or contraction and closure of the thrombolytic basket 4.

[0037] Reference Figure 1-3 The distal end of the stent connection tube 2 is provided with a thrombus removal protection stent 6, which is woven from multiple strands of memory alloy wires, and is connected to an opening and closing control member 7 for controlling its expansion, deployment, contraction and closure. In this embodiment, the stent connection tube 2 is made of NITI tube; the thrombus removal protection stent 6 is in an oblate spherical structure, woven from 48 0.08 mm NITI wires according to a set braiding density, and has a unique shape memory function, as well as excellent characteristics such as wear resistance, corrosion resistance, biocompatibility and superelasticity.

[0038] Reference Figure 1-4 The opening and closing control component 7 includes a movable inner core 71 and a control slider A72. The movable inner core 71 is movably arranged in the bracket connecting tube 2. The distal end of the thrombus removal protection bracket 6 is fixed to the distal end of the movable inner core 71. The control slider A72 is slidably arranged on the operating handle 1. The proximal end of the movable inner core 71 is fixed to the control slider A72. A button A11 is slidably connected to the control slider A72. A compression spring A111 is arranged between the button A11 and the operating handle 1. An upper rack A12 is fixed on the operating handle 1. A lower rack A112 matched with the upper rack A12 is fixed on the button A11.

[0039] When controlling the opening and closing of the thrombus removal protection bracket 6, first press the button A11 to disengage the upper rack A12 from the lower rack A112, and the compression spring A111 is compressed. Then push the button A11 toward the proximal or distal end to drive the control slider A72 to slide on the operating handle 1. The sliding of the control slider A72 drives the movable inner core 71 to slide. The sliding of the movable inner core 71 drives the distal end of the thrombus removal protection bracket 6 to slide. The thrombus removal protection bracket 6 is woven from multiple strands of memory alloy wire and has super elasticity. Therefore, it is possible to control the expansion or contraction of the thrombus removal protection bracket 6. After the opening and closing degree of the thrombus removal protection bracket 6 is adjusted, after releasing the button A11, the compression spring A111 drives the lower rack A112 to reset, so that the lower rack A112 is engaged with the upper rack A12 to achieve locking, which is conducive to precise control of the opening and closing degree of the thrombus removal protection bracket 6.

[0040] Reference Figure 1-4 The expansion and contraction control member 5 includes a basket push tube 51 and a control slider B52. The basket push tube 51 is arranged between the movable tube 3 and the support connecting tube 2. The distal end of the thrombolytic basket 4 is fixed to the distal end of the basket push tube 51, and the proximal end of the thrombolytic basket 4 is fixed to the distal end of the movable tube 3. The control slider B52 is slidably arranged on the operating handle 1. The proximal end of the basket push tube 51 is fixed to the control slider B52. A button B13 is slidably connected to the control slider B52. A compression spring B131 is arranged between the button B13 and the operating handle 1. An upper rack B14 is fixed to the operating handle 1. A lower rack B132 adapted to the upper rack B14 is fixed to the button B13. In this embodiment, the connection positions of the proximal end of the basket push tube 51, the proximal end of the support connecting tube 2, and the proximal end of the movable inner core 71 on the operating handle 1 are arranged in sequence from far to near.

[0041] When the thrombolytic basket 4 is opened and closed, the button B13 is first pressed to disengage the upper rack B14 from the lower rack B132, and the compression spring B131 is compressed. Then the button B13 is pushed toward the proximal or distal end to drive the control slider B52 to slide on the operating handle 1. The sliding of the control slider B52 drives the basket pushing tube 51 to slide. The sliding of the basket pushing tube 51 drives the distal end of the thrombolytic basket 4 to slide, so as to control the expansion or contraction of the thrombolytic basket 4. After the opening and closing degree of the thrombolytic basket 4 is adjusted, the button B13 is released, and the compression spring B131 drives the lower rack B132 to reset, so that the lower rack B132 is engaged with the upper rack B14 to achieve locking, which is conducive to the precise control of the opening and closing degree of the thrombolytic basket 4.

[0042] In this embodiment, the movable inner core 71 and the basket pushing tube 51 are made of NITI tube; the control handle, control slider A72, button A11, control slider B52 and button B13 are all made of ABS or PLA or other medical polymer materials. ABS or PLA are materials that can directly contact the human body, are biocompatible, and are not prone to allergic reactions in the human body.

[0043] Reference Figure 1-3 and Figure 5 The thrombolytic basket 4 is rugby-shaped and includes a plurality of elastic capillaries 41 connected to the movable tube 3, and a plurality of drug delivery holes 411 are provided on the capillaries 41. The distal ends of all the capillaries 41 are closed and fixed on the distal outer wall of the basket push tube 51, and the proximal ends of the capillaries 41 are connected and integrally movably sleeved on the outer side of the basket push tube 51. The thrombus removal device also includes a drug delivery mechanism 8, which is connected to the plurality of capillaries 41 and is used to input thrombolytic liquid into the capillaries 41. In this embodiment, the thrombolytic basket 4 is formed by 9 capillaries 41 welded end to end and end to end, and the capillaries 41 are made of nickel-titanium alloy, and each capillary 41 is provided with 12 drug delivery holes 411.

[0044] Reference Figure 1-3 The drug delivery mechanism 8 includes a y-type valve A81 and an outer sheath 82. The y-type valve A81 includes a main tube A811 and a side branch tube A812. One end of the side branch tube A812 is connected to the main tube A811, and the other end is used to inject thrombolytic solution. The proximal end of the main tube A811 is fixed to the proximal outer wall of the movable tube 3, and the distal end of the main tube A811 is fixed to the proximal outer wall of the outer sheath 82. The proximal ends of multiple capillaries 41 are surrounded to form an annular cavity 42. The distal end of the movable tube 3 is fixed to the inner wall of the annular cavity 42, and the distal end of the outer sheath 82 is fixed to the outer wall of the annular cavity 42.

[0045] When injecting medication, a thrombolytic solution is injected into the outer end of the side branch tube A812, and the thrombolytic solution enters the annular cavity 42 through the interlayer between the outer sheath tube 82 and the movable tube 3, so that the thrombolytic solution can be input into each capillary tube 41, and then the thrombolytic solution can be released into the blood vessel through the medication hole 411. In this way, when treating a thrombus that is difficult to clear, medication can be first administered through the medication hole 411 of the capillary tube 41, and then the position of the outer sheath tube 82 can be moved forward and backward to dissolve the longer thrombi one by one. After the thrombi are dissolved, the outer sheath tube 82 can be moved forward and backward to drive the thrombolytic basket 4 to move, thereby breaking up the thrombi.

[0046] Reference Figure 1-3The outer side of the outer sheath tube 82 is also provided with a suction mechanism 9 for extracting the thrombus from the blood vessel and expelling it from the body. The suction mechanism 9 includes a y-type valve B91 and a suction catheter 92. The y-type valve B91 includes a main pipe B911 and a side branch pipe B912. One end of the side branch pipe B912 is connected to the main pipe B911, and the other end is connected to a negative pressure suction assembly 93. The proximal end of the main pipe B911 is fastened to the outer wall of the outer sheath tube 82, and the distal end of the main pipe B911 is fixed to the proximal outer wall of the suction catheter 92. In this embodiment,

[0047] Reference Figure 1-3 The negative pressure suction component 93 includes a negative pressure connecting tube 931 and a negative pressure suction syringe 932. One end of the negative pressure connecting tube 931 is connected to the side branch tube B912, and the other end is connected to the end of the negative pressure suction syringe 932. A negative pressure valve switch 933 is installed on the negative pressure connecting tube 931, and a syringe lock 934 is installed on the negative pressure suction syringe 932. The syringe lock 934 is used to lock the piston of the negative pressure suction syringe 932.

[0048] In this embodiment, the outer sheath 82, the y-valve A81, the y-valve B91, the negative pressure suction syringe 932, the negative pressure valve switch 933 and the syringe lock 934 are made of ABS or PLA or other medical polymer materials; the suction catheter 92 and the negative pressure connecting tube 931 are polymer braided tubes with an inner layer made of medical polymer materials and an outer layer made of a metal braided layer. Polymers such as Pebax, PI, PTFE, PA, etc., and metals such as SUS304, NITI and other alloy materials are all materials that can directly contact the human body and are not prone to allergic reactions in the human body. Therefore, it is convenient for the negative pressure suction component 93 to directly contact human blood for surgery.

[0049] When the thrombus is discharged from the body, the negative pressure valve switch 933 is first closed, and then the piston of the negative pressure suction syringe 932 is pulled to the maximum stroke and then the syringe lock 934 is pressed to lock the piston of the negative pressure suction syringe 932, so that a negative pressure space is formed between the negative pressure valve switch 933 and the negative pressure suction syringe 932. When the thrombolytic basket 4 drags the broken thrombus to the farthest end of the suction catheter 92, the negative pressure valve switch 933 is opened, so that the thrombus is sucked into the negative pressure suction syringe 932 due to the negative pressure suction force, so as to achieve the purpose of sucking the thrombus and discharging it from the body.

[0050] The implementation principle of a super-elastic intravascular thrombus removal device in an embodiment of the present application is as follows: when using the device to treat a thrombus that is difficult to clear, the present application can be used to inject and administer the drug to dissolve the thrombus, and then a basket physical thrombectomy can be used to remove most of the thrombus, and finally the remaining thrombus can be removed by a negative pressure suction catheter 92. This avoids damage to the inner wall of the blood vessel and the vascular valve caused by direct use of physical thrombectomy, and there is no need to leave the thrombolytic catheter in the body for 3-7 days, which greatly reduces the treatment cycle of drug administration and thrombolysis and reduces the burden on patients.

[0051] The present application can control the expansion and contraction of the thrombolytic basket 4 through the expansion and contraction control component 5. When the thrombolytic basket 4 is closed, it is convenient for the present application to enter the blood vessel; when the thrombolytic basket 4 is expanded, it can cut the blood flow formed by the thrombus like a cutting balloon; and the thrombus can be broken up by moving the movable tube 3 back and forth, which is beneficial to improving the efficiency of thrombus removal.

[0052] A thrombus removal protection stent 6 is provided at the distal end of the present application, and the doctor can control the expansion and contraction of the thrombus removal protection stent 6 through the opening and closing control component 7, and the thrombus removal protection stent 6 is woven from multiple strands of memory alloy wire. In this way, during the process of thrombolysis or mechanical thrombectomy by the doctor, small thrombi and normal blood can circulate normally in the veins and will not be blocked by the thrombus removal protection stent 6, but can effectively prevent larger thrombi from flowing through the veins to the pulmonary artery and causing pulmonary embolism. In this way, there is no need to make another incision in the neck to implant the filter before the thrombus removal or thrombolysis operation, which greatly saves the operation cost and operation time.

[0053] The thrombectomy protection stent 6, thrombolytic basket 4, movable inner core 71, stent connecting tube 2, basket pushing tube 51, movable tube 3, and outer sheath tube 82 in the present application are all made of nickel-titanium alloy material. Nickel-titanium alloy has a unique shape memory function, and also has excellent characteristics such as wear resistance, corrosion resistance, biocompatibility and super elasticity. Therefore, it will not cause deformation after passing through tortuous blood vessels; in addition, nickel-titanium alloy has good elasticity and good controllability. The opening and closing of the protective thrombectomy stent and the thrombolytic basket 4 can be adjusted according to the size of the inner wall of the blood vessel, so as to better fit the blood vessel wall to smoothly perform surgical treatment, and it has a wide range of applicability.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A superelastic intravascular thrombus removal device, characterized in that: include: Operating handle (1); A stent connecting tube (2), the proximal end of the stent connecting tube (2) being fixed to the operating handle (1); A movable tube (3) movably sleeved on the outside of the support connecting tube (2); The thrombolytic basket (4) comprises a plurality of elastic capillaries (41) connected to the movable tube (3), wherein the capillaries (41) are provided with drug delivery holes (411); An expansion and contraction control member (5) is used to control the expansion and deployment or contraction and closure of the thrombolytic basket (4); The drug delivery mechanism (8) is connected to the plurality of capillaries (41) and is used for delivering thrombolytic liquid into the capillaries (41).

2. The superelastic intravascular thrombus removal device according to claim 1, characterized in that: A thrombus removal protection stent (6) is provided at the distal end of the stent connection tube (2); the thrombus removal protection stent (6) is woven from a plurality of memory alloy wires; and the thrombus removal protection stent (6) is connected to an opening and closing control component (7) for controlling its expansion, deployment, contraction and closure.

3. The superelastic intravascular thrombus removal device according to claim 2, characterized in that: The opening and closing control component (7) comprises a movable inner core (71) and a control slider A (72), wherein the movable inner core (71) is movably inserted into the bracket connecting tube (2), the distal end of the thrombus removal protection bracket (6) is fixed to the distal end of the movable inner core (71), the control slider A (72) is slidably arranged on the operating handle (1), the proximal end of the movable inner core (71) is fixed to the control slider A (72), a button A (11) is slidably connected to the control slider A (72), a compression spring A (111) is provided between the button A (11) and the operating handle (1), an upper rack A (12) is provided on the operating handle (1), and a lower rack A (112) matched with the upper rack A (12) is provided on the button A (11).

4. The superelastic intravascular thrombus removal device according to claim 3, characterized in that: The expansion and contraction control member (5) comprises a basket push tube (51) and a control slider B (52); the basket push tube (51) is arranged between the movable tube (3) and the bracket connecting tube (2); the distal end of the thrombolytic basket (4) is fixed to the distal end of the basket push tube (51); the proximal end of the thrombolytic basket (4) is fixed to the distal end of the movable tube (3); the control slider B (52) is slidably arranged on the operating handle (1); the proximal end of the basket push tube (51) is fixed to the control slider B (52); a button B (13) is slidably connected to the control slider B (52); a compression spring B (131) is arranged between the button B (13) and the operating handle (1); an upper rack B (14) is arranged on the operating handle (1); and a lower rack B (132) matched with the upper rack B (14) is arranged on the button B (13).

5. The superelastic intravascular thrombus removal device according to claim 4, characterized in that: The drug delivery mechanism (8) comprises a y-shaped valve A (81) and an outer sheath tube (82), wherein the y-shaped valve A (81) comprises a main tube A (811) and a side branch tube A (812), wherein one end of the side branch tube A (812) is connected to the main tube A (811), and the other end is used for injecting thrombolytic liquid, wherein the proximal end of the main tube A (811) is fixed to the proximal outer wall of the movable tube (3), and the distal end of the main tube A (811) is fixed to the proximal outer wall of the outer sheath tube (82), wherein the proximal ends of the plurality of capillaries (41) form an annular cavity (42), the distal end of the movable tube (3) is fixed to the inner wall of the annular cavity (42), and the distal end of the outer sheath tube (82) is fixed to the outer wall of the annular cavity (42).

6. The superelastic intravascular thrombus removal device according to claim 5, characterized in that: The outer side of the outer sheath tube (82) is also provided with a suction mechanism (9) for extracting the thrombus from the blood vessel and expelling it from the body.

7. The superelastic intravascular thrombus removal device according to claim 6, characterized in that: The suction mechanism (9) includes a y-type valve B (91) and a suction catheter (92), wherein the y-type valve B (91) includes a main pipe B (911) and a side branch pipe B (912), wherein one end of the side branch pipe B (912) is connected to the main pipe B (911), and the other end is connected to a negative pressure suction assembly (93), wherein the proximal end of the main pipe B (911) is fastened to the outer wall of the outer sheath tube (82), and the distal end of the main pipe B (911) is fixed to the proximal outer wall of the suction catheter (92).

8. The superelastic intravascular thrombus removal device according to claim 7, characterized in that: The negative pressure suction assembly (93) comprises a negative pressure connecting tube (931) and a negative pressure suction syringe (932), one end of the negative pressure connecting tube (931) is connected to the side branch tube B (912), and the other end is connected to the end of the negative pressure suction syringe (932), the negative pressure connecting tube (931) is provided with a negative pressure valve switch (933), and the negative pressure suction syringe (932) is provided with a syringe lock (934), and the syringe lock (934) is used to lock the piston of the negative pressure suction syringe (932).

9. The superelastic intravascular thrombus removal device according to claim 4, characterized in that: The thrombolytic basket (4) is arranged in a rugby ball shape, the distal ends of all the capillaries (41) are closed and fixed on the distal outer wall of the basket pushing tube (51), and the proximal ends of the capillaries (41) are connected and movably sleeved on the outer side of the basket pushing tube (51).

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