A thrombus removal catheter

Abstract

The thrombus removal catheter provided by the present invention comprises a guide wire tube, a transmission tube rotatably sleeved on the outside of the guide wire tube, an outer tube movably sleeved on the outside of the transmission tube, a fixed mesh basket with multiple outer frames, and a rotary cutting mesh basket arranged on the inner side of the fixed mesh basket. The fixed mesh basket and the rotary cutting mesh basket are both sleeved on the guide wire tube. The rotary cutting mesh basket comprises multiple inner frames with cutting edges on the sides, so that the fixed mesh basket is driven to open and the rear end thereof is connected to the transmission tube. When the outer tube moves forward, the outer and inner frames are retracted so that the fixed mesh basket and the rotary cutting mesh basket are retracted into the outer tube. When the outer tube moves backward to expose the fixed mesh basket, the outer frame is deformed to cut into the thrombus and press against the blood vessel wall, so that the fixed mesh basket is opened and drives the rotary cutting mesh basket to open. The rotary cutting mesh basket can rotate so that the cutting edges on the inner frame cut the thrombus squeezed into the fixed mesh basket, thereby achieving thrombus removal. During rotary cutting, the outer frame supports the blood vessel wall and fixes the thrombus, which is not easy to cause blood vessel damage and has a good thrombus removal effect.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a thrombus removal catheter for percutaneous mechanical thrombus removal. Background Art

[0002] Long-term presence of thrombus in the deep veins of the lower extremities can lead to obstruction of blood flow back to the heart, which in turn causes venous hypertension, symptoms such as lower extremity swelling, decreased walking function, lower extremity pigmentation, and difficult-to-heal ulcers, which seriously affect the subject's quality of life. Clinically, early treatment of deep vein thrombosis usually involves the following methods:

[0003] 1. Anticoagulation: Anticoagulation is the basic treatment for deep vein thrombosis. It can inhibit the spread of thrombus, promote thrombus autolysis and recanalization of the lumen, and reduce the incidence and mortality of pulmonary embolism (PE). However, anticoagulation alone cannot effectively eliminate thrombus and it is difficult to reduce the incidence of post-thrombotic syndrome.

[0004] 2. Thrombolytic therapy: includes catheter-directed thrombolysis (CDT) and systemic thrombolysis, but it is easy to bleed during treatment. The larger the dosage of the drug and the longer the treatment time, the greater the risk of bleeding. Systemic medication is more dangerous than local medication.

[0005] 3. Surgical thrombectomy: It is necessary to cut the femoral vein and remove the thrombus by squeezing. This method may cause many complications.

[0006] 4. Percutaneous Mechanical Thrombectomy (PMT): A thrombus-dissecting mechanism is first delivered to the site of vascular lesions via a catheter. The thrombus is then broken up using the mechanism, and finally the thrombus fragments are extracted by suction to complete the thrombus removal. Compared with traditional thrombolytic therapy, this approach has the advantages of immediately restoring blood flow, shortening thrombolysis time, rapidly relieving patient symptoms, reducing the dose of thrombolytics and the risk of bleeding. It is the most promising option for treating deep vein thrombosis.

[0007] The focus of existing percutaneous mechanical thrombectomy catheters is on how to prevent the escape of chopped thrombus fragments. Most of them adopt the method of setting a mesh basket on the front and / or rear side of the rotary cutting mechanism to intercept. For example, Chinese patents CN119112291A and CN112472210A disclose such catheters. However, no attention is paid to how to better cut the thrombus. The method of cutting the thrombus is limited to rotating through an arc-shaped knife or cutting wire. During rotary cutting, the blood vessel wall where the thrombus is located is not supported, nor is the thrombus fixed. It is easy to cause blood vessel damage due to the concave of the blood vessel wall, and it is also easy to cause incomplete thrombus removal due to the avoidance of the thrombus. At the same time, the rotary cutting radius cannot be adjusted. When the blood vessel wall is thin, rotary cutting too close to the blood vessel wall is likely to cut the blood vessel wall, which increases the risk of surgery. Summary of the Invention

[0008] The purpose of the present invention is to overcome one or more disadvantages of the prior art and provide a thrombus removal catheter.

[0009] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is that a thrombus removal catheter comprises:

[0010] Wire guide tube;

[0011] A transmission tube rotatably sleeved on the outside of the wire guide tube;

[0012] An outer tube that is movably mounted on the outside of the transmission tube;

[0013] A fixed basket having multiple outer frames, the outer frames being cut and heat-formed from nickel-titanium tubes;

[0014] The invention also includes a rotary cutting basket arranged on the inner side of the fixed basket, the rotary cutting basket includes multiple inner frames with cutting edges on the sides, the fixed basket and the rotary cutting basket are both sleeved on the wire guide tube, the rotary cutting basket is driven to open by the fixed basket, the rear end of the rotary cutting basket is connected to the front end of the transmission tube, when the outer tube moves forward, the outer frame and the inner frame are retracted to make the fixed basket and the rotary cutting basket shrink into the outer tube, when the outer tube moves backward to expose the fixed basket, the outer frame is deformed to cut into the thrombus and press against the blood vessel wall, so that the fixed basket is opened and drives the rotary cutting basket to open, and the rotary cutting basket can be rotated to make the cutting edges on the inner frame cut the thrombus squeezed into the fixed basket, thereby achieving thrombus removal.

[0015] Preferably, the rotary cutting basket also includes an inner front bundle tube connected to the front end of all inner frames and an inner rear bundle tube connected to the rear end of all inner frames, the inner front bundle tube can be movably sleeved on the wire guide tube, and the inner rear bundle tube is sleeved on the wire guide tube and connected to the front end of the transmission tube.

[0016] Further preferably, the fixed mesh basket also includes an outer front beam tube connected to the front end of all outer frames and an outer rear beam tube connected to the rear end of all outer frames, the outer front beam tube can be slidably mounted on the inner front beam tube forward and backward, and the outer rear beam tube can be movably mounted on the inner rear beam tube forward and backward.

[0017] Further preferably, a front annular flange is provided on the inner front bundle tube, and the front annular flange blocks the rear side of the outer front bundle tube; a rear annular flange is provided on the inner rear bundle tube, and the rear annular flange blocks the front side of the outer rear bundle tube. When the fixed mesh basket is expanded, the outer front bundle tube and the outer rear bundle tube move toward each other, and the front annular flange and the rear annular flange drive the inner front bundle tube and the inner rear bundle tube to move toward each other, so that the rotary cutting mesh basket is expanded.

[0018] Further preferably, an adjusting rod sleeve is passed through the inner front bundle tube and the inner rear bundle tube, and the adjusting rod sleeve is movably sleeved on the wire guide tube forward and backward. The front end portion of the adjusting rod sleeve is provided with an annular flange pressed against the front end surface of the inner front bundle tube. When the adjusting rod sleeve moves backward, the inner front bundle tube can be driven backward by the annular flange to adjust the expansion degree of the rotary cutting basket.

[0019] Further preferably, the rear end of the adjusting rod sleeve is connected to a pull wire for driving the adjusting rod sleeve to move forward and backward, the pull wire is located in the transmission tube, and the rear end of the pull wire passes backward through the transmission tube and the outer tube.

[0020] Further preferably, the pull wire is a metal flat wire, the adjusting rod sleeve is a metal rod sleeve, the rear end of the adjusting rod sleeve is provided with an axial notch whose width matches the pull wire, and the front end of the pull wire is embedded and welded in the axial notch.

[0021] Further preferably, an adjustment box and an adjustment knob are provided on the wire guide tube, and the adjustment box and the adjustment knob are located behind the transmission tube. The adjustment box is used to accommodate the rear end of the pull wire, and the adjustment knob is used to control the length of the pull wire pulled backward or released forward.

[0022] Preferably, the outer tube is composed of three layers of materials from the inside to the outside, the inner layer is a hydrophobic material layer, the middle layer is a metal braided layer, and the outer layer is a polymer material layer.

[0023] Preferably, both ends of the transmission tube are stainless steel tubes, and the middle section is a metal braided wire tube, so that the transmission tube has rotational flexibility.

[0024] Preferably, the guide wire tube is a polymer tube, and a guide wire and a balloon can pass through the guide wire tube.

[0025] Preferably, the thrombus removal catheter also includes a catheter connector, a sliding sleeve and a bushing tube which are sequentially sleeved on the transmission tube in the front-to-back direction, the front end of the catheter connector is sealedly connected to the rear end of the outer tube, the rear end of the catheter connector is inserted into the sliding sleeve, and the front end of the bushing tube is rotatably and axially slidably inserted into the sliding sleeve and rotates synchronously with the transmission tube.

[0026] Further preferably, the catheter connector is a Y-shaped hollow structural member, the inner wall of the sliding sleeve is sealedly connected to the outer wall of the catheter connector, and is dynamically sealed to the outer wall of the bushing tube, so that the rear end of the catheter connector corresponds to a closed cavity, and the bifurcated end of the catheter connector is connected to a peristaltic pump for aspirating thrombus fragments.

[0027] Further preferably, a fixed seal is provided between the inner wall of the sliding sleeve and the outer wall of the catheter connector, and a movable seal is provided between the inner wall of the sliding sleeve and the outer wall of the lining tube.

[0028] Further preferably, the bushing tube is a metal tube, and a milling plane is provided on the bushing tube, and the milling plane is located behind the sliding sleeve. The milling plane is connected to the drive motor through a transmission unit. When the drive motor rotates, the transmission unit transmits the power of the drive motor to the bushing tube through the milling plane, so that the bushing tube rotates and drives the transmission tube to rotate.

[0029] Further preferably, the transmission unit is any one of gear transmission, belt transmission or chain transmission.

[0030] Further preferably, the thrombus removal catheter further comprises a control component, wherein the control component is connected to the peristaltic pump and the drive motor and is used to control the actions of the peristaltic pump and the drive motor.

[0031] Preferably, there are four outer frames which are evenly distributed around the axis of the wire guide tube, and the two outer frames on opposite sides form a hexagonal outer frame.

[0032] Preferably, there are two inner frames which are evenly distributed around the axis of the wire guide tube, and the two inner frames form a hexagonal inner frame.

[0033] Preferably, when the peeling basket is expanded, the distance between the inner frame and the outer frame is 2 to 4 mm.

[0034] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0035] The thrombus removal catheter provided by the present invention comprises a guide wire tube, a transmission tube rotatably sleeved on the outside of the guide wire tube, an outer tube movably sleeved on the outside of the transmission tube, a fixed mesh basket with multiple outer frames, and a rotary cutting mesh basket arranged on the inner side of the fixed mesh basket. The fixed mesh basket and the rotary cutting mesh basket are both sleeved on the guide wire tube. The rotary cutting mesh basket comprises multiple inner frames with cutting edges on the sides, so that the fixed mesh basket is driven to open and the rear end thereof is connected to the transmission tube. When the outer tube moves forward, the outer and inner frames are retracted so that the fixed mesh basket and the rotary cutting mesh basket are retracted into the outer tube. When the outer tube moves backward to expose the fixed mesh basket, the outer frame is deformed to cut into the thrombus and press against the blood vessel wall, so that the fixed mesh basket is opened and drives the rotary cutting mesh basket to open. The rotary cutting mesh basket can rotate so that the cutting edges on the inner frame cut the thrombus squeezed into the fixed mesh basket, thereby achieving thrombus removal. During rotary cutting, the outer frame supports the blood vessel wall and fixes the thrombus, which is not easy to cause blood vessel damage and has a good thrombus removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic front view of the first embodiment of the present invention.

[0037] Figure 2 yes Figure 1 A partial enlarged schematic diagram of the fixed basket and the rotary cutting basket.

[0038] Figure 3 yes Figure 2 A partial three-dimensional schematic diagram of .

[0039] Figure 4 It is a main schematic diagram of embodiment 2 of the present invention.

[0040] Figure 5 yes Figure 4 A partial enlarged schematic diagram of the fixed basket and the rotary cutting basket.

[0041] Figure 6 yes Figure 5 Schematic cross-sectional view of .

[0042] Figure 7 yes Figure 4 An enlarged schematic cross-sectional view of the middle conduit connector. The peristaltic pump is omitted for ease of observation.

[0043] Figure 8 yes Figure 4 The enlarged cross-sectional view of the middle bushing shows that the transmission unit and drive motor are omitted for easy observation.

[0044] Figure 9 yes Figure 4 Schematic diagram of the top view of the adjustment box and adjustment knob.

[0045] Figure 10 yes Figure 6 A local enlarged schematic diagram of point A in the middle.

[0046] Figure 11 yes Figure 7 A partial enlarged schematic diagram of point B in the middle.

[0047] Figure 12 yes Figure 8 A partial enlarged schematic diagram of point C in the middle.

[0048] Among them: 10. Wire guide tube; 20. Transmission tube; 30. Outer tube; 40. Fixed mesh basket; 41. Outer frame; 42. Outer front bundle tube; 43. Outer rear bundle tube; 50. Peeling mesh basket; 51. Inner frame; 52. Inner front bundle tube; 521. Front annular flange; 53. Inner rear bundle tube; 531. Rear annular flange; 54. Adjusting rod sleeve; 541. Annular flange; 542. Axial notch; 55. Pull wire; 60. Catheter connector; 61. Peristaltic pump; 70. Sliding sleeve; 71. Fixed seal; 72. Movable seal; 80. Bushing tube; 81. Milling plane; 82. Transmission unit; 83. Drive motor; 91. Circuit board; 92. Power supply; 93. Adjustment box; 94. Adjustment knob. DETAILED DESCRIPTION

[0049] Example 1, as Figures 1 to 3 As shown, the thrombus removal catheter provided by the present invention includes: a guide wire tube 10, a transmission tube 20, an outer tube 30, a fixed net basket 40, and a rotary cutting net basket 50, wherein the guide wire tube 10 is a polymer tube made of a polymer material (such as PEEK, etc.), and a guide wire and a balloon can pass through the guide wire tube 10; the transmission tube 20 is rotatably sleeved on the outside of the guide wire tube 10; the outer tube 30 is movably sleeved on the outside of the transmission tube 20, and the outer tube 30 is composed of three layers of materials from the inside to the outside, the inner layer is a hydrophobic The material layer, the middle layer is a metal braided layer, and the outer layer is a polymer material layer; the fixed mesh basket 40 is sleeved on the wire guide tube 10, and the fixed mesh basket 40 has four outer frames 41, which are evenly distributed around the axis of the wire guide tube 10. The outer frames 41 are cut and heat-set by nickel-titanium tubes. In a natural state, the two outer frames 41 on the opposite sides form a hexagonal outer frame; the rotary cutting mesh basket 50 is arranged on the inner side of the fixed mesh basket 40, and the rotary cutting mesh basket 50 is sleeved on the wire guide tube 10. The cutting basket 50 includes two inner frames 51 with cutting edges on the sides. The two inner frames 51 are evenly distributed around the axis of the wire guide tube 10. The peeling basket 50 is driven by the fixed basket 40 to open. The rear end of the peeling basket 50 is connected to the front end of the transmission tube 20. When the peeling basket 50 is opened, the two inner frames 51 form a hexagonal inner frame. When the outer tube 30 moves forward, the front end of the outer tube 30 gradually squeezes the outer frame 41 and the inner frame 51, so that the outer frame 41 and the inner frame The frame 51 is retracted, so that the fixed basket 40 and the rotary cutting basket 50 are retracted into the outer tube 30 so as to penetrate the vascular lesion. When the outer tube 30 moves backward to expose the fixed basket 40, the outer frame 41 deforms and cuts into the thrombus and presses against the blood vessel wall, so that the fixed basket 40 is expanded and the rotary cutting basket 50 is expanded. The rotary cutting basket 50 can rotate under the drive tube 20, and this rotation causes the cutting edge of the inner frame 51 to cut the thrombus squeezed into the fixed basket 40, thereby achieving thrombus removal.

[0050] The advantage of this arrangement is that during rotary cutting, the outer frame 41 can support the blood vessel wall and fix the thrombus, which is not likely to cause blood vessel damage due to the concave blood vessel wall, and the thrombus will not avoid the phenomenon, and the thrombus removal effect is good.

[0051] The outer wall of the inner rear beam tube 53 is flush with the outer wall of the transmission tube 20; the fixed net basket 40 also includes an outer front beam tube 42 connected to the front end of all outer frames 41 and an outer rear beam tube 43 connected to the rear end of all outer frames 41; the outer front beam tube 42 can be slidably mounted on the inner front beam tube 52, and the outer rear beam tube 43 can be movably mounted on the inner rear beam tube 53. In order to make the fixed net basket 40 drive the peeling net basket 50 to open better when it is opened, and avoid squeezing the inner frame 51 when it is opened to cause damage, the inner front beam tube 53 is further 2 is provided with a front annular flange 521, which blocks the rear side of the outer front bundle tube 42, and the outer circumferential surface of the front annular flange 521 is flush with the outer wall of the outer front bundle tube 42. The inner rear bundle tube 53 is provided with a rear annular flange 531, which blocks the front side of the outer rear bundle tube 43, and the outer circumferential surface of the rear annular flange 531 is flush with the outer wall of the outer rear bundle tube 43. When the fixed basket is expanded, the outer front bundle tube 42 and the outer The rear bundle tube 43 moves toward each other, pressing against the front annular flange 521 and the rear annular flange 531, and the front annular flange 521 and the rear annular flange 531 respectively drive the inner front bundle tube 52 and the inner rear bundle tube 53 to move toward each other, so that the rotary cutting basket 50 is expanded. In order to maximize the rotary cutting effect of thrombus and avoid interference, when the rotary cutting basket 50 is expanded, the distance between the inner frame 51 and the outer frame 41 is preferably 2 to 4 mm.

[0052] The thrombus removal catheter also includes a catheter connector 60, a sliding sleeve 70 and a bushing tube 80, which are sequentially sleeved on the transmission tube 20 in the front-to-back direction. The front end of the catheter connector 60 is sealedly connected to the rear end of the outer tube 30, and the rear end of the catheter connector 60 is inserted into the sliding sleeve 70. The front end of the bushing tube 80 is rotatably and axially slidably inserted into the sliding sleeve 70 and rotates synchronously with the transmission tube 20.

[0053] In order to achieve the suction of thrombus fragments, further, the catheter connector 60 is a Y-shaped hollow structural member, and a fixed seal 71 is provided between the inner wall of the sliding sleeve 70 and the outer wall of the catheter connector 60, so that the inner wall of the sliding sleeve 70 and the outer wall of the catheter connector 60 are sealed. At the same time, a movable seal 72 is provided between the inner wall of the sliding sleeve 70 and the outer wall of the liner tube 80. The movable seal 72 is ring-shaped and is sleeved on the front end of the liner tube 80 and squeezed tightly in the sliding sleeve 70, so that the liner tube 80 is sealed. 0 can both rotate relative to the sliding sleeve 70 and move axially relative to the sliding sleeve 70, thereby realizing a dynamic sealing connection between the inner wall of the sliding sleeve 70 and the outer wall of the liner tube 80, so that the rear end of the catheter connector 60 corresponds to a closed cavity. The bifurcated end of the catheter connector 60 is connected to a peristaltic pump 61 for aspirating thrombus fragments. When the peristaltic pump 61 is in operation, a vacuum can be formed in the cavity between the catheter connector 60, the outer tube 30 and the transmission tube 20, thereby aspirating the thrombus fragments chopped by the inner frame 51 and expelling them from the body.

[0054] In order to realize the rotation of the transmission tube 20, in this embodiment, the bushing tube 80 is a metal tube, and a milling plane 81 is provided on the bushing tube 80. The milling plane 81 is located behind the sliding sleeve 70. The milling plane 81 is connected to the drive motor 83 through the transmission unit 82. When the drive motor 83 rotates, the transmission unit 82 transmits the power of the drive motor 83 to the bushing tube 80 through the milling plane 81, so that the bushing tube 80 rotates and drives the transmission tube 20 to rotate. The transmission unit 82 is any one of gear transmission, belt transmission or chain transmission.

[0055] In this embodiment, both ends of the transmission tube 20 are stainless steel tubes, and the middle section is a metal braided wire tube, so that the transmission tube 20 has rotational flexibility and avoids component damage caused by deformation of the inner frame 51 and interference with the outer frame 41.

[0056] To facilitate control, the thrombus removal catheter further includes a control component, which is connected to the peristaltic pump 61 and the drive motor 83 and is used to control the operation of the peristaltic pump 61 and the drive motor 83. Specifically, the control component includes a circuit board 91 and a power supply 92. The circuit board 91 is electrically connected to the peristaltic pump 61 and the drive motor 83 through wires. The power supply 92 is preferably a dry cell battery or a dry cell battery pack. The power supply 92 is electrically connected to the circuit board 91 through wires. By controlling the operation of the drive motor 83 and the peristaltic pump 61, thrombus rotation and fragment aspiration can be achieved, thereby greatly improving the efficiency of thrombus removal for peripheral acute venous thrombosis.

[0057] Example 2, as Figures 4 to 12As shown, the second embodiment is basically the same as the first embodiment, except that, in the second embodiment, the expansion degree of the peeling basket 50 can be adjusted. Specifically, an adjusting rod sleeve 54 is further provided in the inner front bundle tube 52 and the inner rear bundle tube 53. The adjusting rod sleeve 54 can be movably sleeved on the wire guide tube 10 forward and backward. The front end portion of the adjusting rod sleeve 54 is provided with an annular flange 541 that is pressed against the front end surface of the inner front bundle tube 52. When the adjusting rod sleeve 54 moves backward, the inner front bundle tube 52 can be driven to move backward through the annular flange 541, thereby adjusting the expansion degree of the peeling basket 50.

[0058] To facilitate operation, the rear end of the adjusting rod sleeve 54 is further connected to a pull wire 55 for driving the adjusting rod sleeve 54 to move forward and backward. The pull wire 55 is located in the transmission tube 20, and the rear end of the pull wire 55 passes rearward through the transmission tube 20 and the outer tube 30. Furthermore, the pull wire 55 is a metal flat wire, and the adjusting rod sleeve 54 is a metal rod sleeve. The rear end of the adjusting rod sleeve 54 is provided with an axial notch 542 with a width matching that of the pull wire 55, and the front end of the pull wire 55 is embedded and welded in the axial notch 542.

[0059] Furthermore, an adjusting box 93 and an adjusting knob 94 are provided on the wire guide tube 10, and the adjusting box 93 and the adjusting knob 94 are located behind the transmission tube 20. The adjusting box 93 is used to store the rear end of the pull wire 55, and the adjusting knob 94 is used to control the length of the pull wire 55 pulled backward or released forward. The adjusting knob 94 can retract and release the pull wire 55 by mechanical rotation or electric rotation. This part of the structure is existing technology and will not be repeated here.

[0060] The advantage of this arrangement is that the degree of expansion of the rotary cutting basket 50 can be adjusted according to actual conditions, thereby achieving precise fragmentation of thrombi of different forms. In particular, when the blood vessel wall is thin, the degree of expansion of the rotary cutting basket 50 can be artificially reduced, so that the rotary cutting basket 50 can be kept as far away from the blood vessel wall as possible while fragmenting the thrombus, avoiding cutting the blood vessel wall and reducing surgical risks.

[0061] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A thrombus removal catheter, comprising: Wire guide tube; A transmission tube rotatably sleeved on the outside of the wire guide tube; An outer tube that is movably mounted on the outside of the transmission tube; A fixed basket having multiple outer frames, the outer frames being cut and heat-formed from nickel-titanium tubes; Its characteristics are: The rotary cutting basket is also provided on the inner side of the fixed basket. The fixed basket and the rotary cutting basket are both sleeved on the wire guide tube. The rotary cutting basket includes a plurality of inner frames with cutting edges on the sides, an inner front beam tube connected to the front end of all the inner frames, and an inner rear beam tube connected to the rear end of all the inner frames. The inner front beam tube is sleeved on the wire guide tube so as to be movable forward and backward. The inner rear beam tube is sleeved on the wire guide tube and connected to the front end of the transmission tube. The fixed basket also includes an outer front beam tube connected to the front end of all outer frames and an outer rear beam tube connected to the rear end of all outer frames. The outer front beam tube can be slidably mounted on the inner front beam tube, and the outer rear beam tube can be movably mounted on the inner rear beam tube. The inner front bundle tube is provided with a front annular flange, which blocks the rear side of the outer front bundle tube. The inner rear bundle tube is provided with a rear annular flange, which blocks the front side of the outer rear bundle tube. When the fixed basket is expanded, the outer front bundle tube and the outer rear bundle tube move toward each other, and the front annular flange and the rear annular flange drive the inner front bundle tube and the inner rear bundle tube to move toward each other, so that the peeling basket is expanded. When the outer tube moves forward, the outer frame and the inner frame are retracted, causing the fixed basket and the rotary cutting basket to shrink into the outer tube. When the outer tube moves backward to expose the fixed basket, the outer frame deforms and cuts into the thrombus and presses against the blood vessel wall, causing the fixed basket to expand and drive the rotary cutting basket to expand. The rotary cutting basket can rotate to allow the cutting edge on the inner frame to cut the thrombus squeezed into the fixed basket, thereby achieving thrombus removal.

2. The thrombus removal catheter according to claim 1, characterized in that: An adjusting rod sleeve is further provided in the inner front bundle tube and the inner rear bundle tube. The adjusting rod sleeve is movably sleeved on the wire guide tube forward and backward. The front end portion of the adjusting rod sleeve is provided with an annular flange pressed against the front end surface of the inner front bundle tube. When the adjusting rod sleeve moves backward, the inner front bundle tube can be driven backward by the annular flange to adjust the expansion degree of the rotary cutting basket.

3. The thrombus removal catheter according to claim 2, characterized in that: The rear end of the adjusting rod sleeve is connected with a pull wire for driving the adjusting rod sleeve to move forward and backward. The pull wire is located in the transmission tube, and the rear end of the pull wire passes through the transmission tube and the outer tube backward.

4. The thrombus removal catheter according to claim 3, characterized in that: The pull wire is a metal flat wire, the adjusting rod sleeve is a metal rod sleeve, the rear end of the adjusting rod sleeve is provided with an axial notch with a width matching that of the pull wire, and the front end of the pull wire is embedded and welded in the axial notch.

5. The thrombus removal catheter according to claim 3, characterized in that: The wire guide tube is provided with an adjustment box and an adjustment knob, which are located behind the transmission tube. The adjustment box is used to accommodate the rear end of the pull wire, and the adjustment knob is used to control the length of the pull wire pulled backward or released forward.

6. The thrombus removal catheter according to claim 1, characterized in that: The outer tube is composed of three layers of materials from the inside to the outside, the inner layer is a hydrophobic material layer, the middle layer is a metal braided layer, and the outer layer is a polymer material layer.

7. The thrombus removal catheter according to claim 1, characterized in that: The two ends of the transmission tube are stainless steel tubes, and the middle section is a metal braided wire tube, so that the transmission tube has rotational flexibility.

8. The thrombus removal catheter according to claim 1, characterized in that: The guide wire tube is a polymer tube, and a guide wire and a balloon can pass through the guide wire tube.

9. The thrombus removal catheter according to claim 1, characterized in that: The thrombus removal catheter also includes a catheter connector, a sliding sleeve and a bushing tube which are sequentially sleeved on the transmission tube in the front-to-back direction. The front end of the catheter connector is sealed with the rear end of the outer tube, the rear end of the catheter connector is inserted into the sliding sleeve, and the front end of the bushing tube is rotatably and axially slidably inserted into the sliding sleeve and rotates synchronously with the transmission tube.

10. The thrombus removal catheter according to claim 9, characterized in that: The catheter connector is a Y-shaped hollow structural component. The inner wall of the sliding sleeve is sealed and connected to the outer wall of the catheter connector and is dynamically sealed and connected to the outer wall of the bushing tube, so that the rear end of the catheter connector corresponds to a closed cavity. The bifurcated end of the catheter connector is connected to a peristaltic pump for aspirating thrombus fragments.

11. The thrombus removal catheter according to claim 10, characterized in that: A fixed seal is provided between the inner wall of the sliding sleeve and the outer wall of the conduit connector, and a movable seal is provided between the inner wall of the sliding sleeve and the outer wall of the lining tube.

12. The thrombus removal catheter according to claim 10, characterized in that: The bushing tube is a metal tube and is provided with a milling plane. The milling plane is located behind the sliding sleeve. The milling plane is connected to the drive motor through a transmission unit. When the drive motor rotates, the transmission unit transmits the power of the drive motor to the bushing tube through the milling plane, causing the bushing tube to rotate and drive the transmission tube to rotate.

13. The thrombus removal catheter according to claim 12, characterized in that: The transmission unit is any one of gear transmission, belt transmission or chain transmission.

14. The thrombus removal catheter according to claim 12, characterized in that: The thrombus removal catheter further includes a control component, which is connected to the peristaltic pump and the drive motor and is used to control the actions of the peristaltic pump and the drive motor.

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