Rapid exchange stent retriever system

Abstract

The present invention discloses a rapid exchange type stent thrombectomy system, which system includes a stent basket assembly, and further includes a retrieval catheter for delivering the stent basket assembly to the distal end of a blood vessel. The retrieval catheter includes a delivery tube, and a connecting rod is provided at the proximal end of the delivery tube; by pushing the stent basket assembly or pulling the connecting rod, the stent basket assembly is axially moved relative to the delivery tube, so that the stent basket assembly extends out and unfolds from the distal end of the delivery tube to capture thrombus. Compared with the prior art, the thrombectomy process can be achieved with single-handed operation, the operation difficulty is reduced, the number of manipulations of extracorporeal instruments during the thrombectomy process can be reduced, and the cooperation requirements between the operator and the assistant are lowered; when multiple thrombectomies are required, a rapid channel can be established, and the operation time can be shortened.

Description

Technical Field

[0001] The present invention relates to a medical device, and particularly to a rapid exchange type stent thrombectomy system for coronary thrombectomy surgery. Background Art

[0002] With the aging of the population and the changes in people's lifestyles and habits, thromboembolic diseases have increasingly become a major global health problem and the leading cause of global population death. At present, the clinical treatment methods for thrombus include drug thrombolysis and mechanical thrombectomy.

[0003] Drug thrombolysis is to dissolve the thrombus by intravenous or arterial injection of recombinant tissue plasminogen activator (rt-PA) to restore blood flow. However, thrombolytic therapy has strict limitations on the time window and still has a high mortality and disability rate.

[0004] Mechanical thrombectomy is to deliver the thrombectomy device to the location of the thrombus and then further remove the thrombus from the blood vessel, including thrombus resection, thrombus aspiration, stent thrombectomy, etc. Stent thrombectomy has the advantages of navigation and rapid vascular recanalization, and the risk of long-term complications is lower.

[0005] Currently, for coronary stent thrombectomy, such as Figures 1 - 6As shown in the figure, an in vitro controlled thrombectomy stent 9, a microcatheter 8, a subcatheter 7 of a guiding catheter, and a filter protection device 6 are required. During the operation, the subcatheter 7 of the guiding catheter enters the target blood vessel through the guiding catheter; then the filter protection device 6 is delivered to the distal end of the thrombus through the microcatheter 8; the thrombectomy stent 9 is operated to enter the microcatheter 8, and the thrombectomy stent 9 is pushed until the distal imaging marker coincides with the imaging marker of the microcatheter 8; the stent 9 is released to capture the thrombus; during withdrawal, the stent 9 and the microcatheter 8 are withdrawn as a whole into the subcatheter 7 of the guiding catheter; then the stent 9, the microcatheter 8, and the subcatheter 7 of the guiding catheter are withdrawn from the body as a whole. During the thrombectomy process, one operator needs to control the microcatheter 8, the thrombectomy stent 9, and the subcatheter 7 of the guiding catheter, and another assistant is required to cooperate in fixing the filter protection device, etc. Since multiple instruments are controlled simultaneously, the operation difficulty is increased, and the cooperation degree of the operator and the assistant is tested; moreover, one thrombectomy may not necessarily recanalize the blood vessel, and multiple thrombectomy operations are required. Due to the core wire length limitation of the filter protection device (for convenient clinical operation, its core wire length is generally 190 cm), when the subcatheter 7 of the guiding catheter is a wire-through type, an extension wire must be used to establish a passage for the subcatheter 7 of the guiding catheter; when the subcatheter of the guiding catheter is a rapid exchange type, an extension wire is not required, and a passage can be established through the core wire of the filter protection device. Due to the core wire length limitation of the filter protection device (for convenient clinical operation, its core wire length is generally 190 cm), the microcatheter cannot enter the blood vessel along the core wire of the filter protection device. At this time, an extension wire must be used to introduce the microcatheter to the target position to establish a passage. When using an extension wire to establish the above passage, a larger operating space is required. This operation requires the assistant to fix the extension wire and the core wire of the filter protection device with both hands, and the operator and the assistant cooperate to carefully send the subcatheter of the guiding catheter or the microcatheter into the target blood vessel. This operation requires a larger operating space and greatly increases the operation difficulty and operation time. Summary of the Invention

[0006] The purpose of the present invention is to provide a rapid exchange type stent loading and unloading system, and the technical problem to be solved is to achieve single-handed operation and reduce the operation difficulty.

[0007] To solve the above problems, the present invention is implemented by the following technical solutions: A rapid exchange type stent thrombectomy system, which system includes a stent basket assembly, and further includes a retrieval catheter for delivering the stent basket assembly to the distal end of the blood vessel. The retrieval catheter includes a delivery tube, and a connecting rod is provided at the proximal end of the delivery tube; by pushing the stent basket assembly or pulling the connecting rod, the stent basket assembly is axially moved relative to the delivery tube, so that the stent basket assembly extends out and expands from the distal end of the delivery tube to capture the thrombus.

[0008] Further, the retrieval catheter further includes a push tube, the push tube is arranged at the proximal end of the connecting rod, and the proximal end of the stent basket assembly passes through the delivery tube and extends out from the proximal end of the delivery tube.

[0009] Further, a first imaging mark is provided on the tube body at the distal end of the delivery tube.

[0010] Further, the system further includes an operating handle for pushing and pulling the retrieval catheter.

[0011] Further, the operating handle has a handle cavity extending along the axial direction of the operating handle. The distal end of the operating handle has a hole communicating with the handle cavity. A push-pull handle is provided in the handle cavity and can move axially along the handle cavity. The distal end of the push-pull handle extends out of the operating handle. The proximal end of the push rod is fixed on the push-pull handle, and the proximal end of the stent basket assembly is fixed in the handle cavity, so as to drive the retrieval catheter to move after pushing the push-pull handle to move axially along the operating handle.

[0012] Further, a loader that can be pushed and moved together with the push-pull handle is provided at the proximal end of the push-pull handle. A loader through cavity is provided in the loader, so that the proximal end of the push rod passes through the push-pull handle and then is inserted into the loader and communicates with the loader through cavity. The proximal end of the loader through cavity also allows the proximal end of the stent basket assembly to extend out from the proximal end of the loader and be fixed in the handle cavity. A hemostatic valve is provided in the proximal end of the loader through cavity, and the proximal end of the stent basket assembly passes through the hemostatic valve.

[0013] Further, a three-way pipe connected to the loader through cavity through a pipeline is provided on the operating handle.

[0014] Further, a limiting bolt is provided on the handle body of the operating handle. The limiting bolt is fixed at the proximal end of the push-pull handle. A handle chute is provided on the push-pull handle, and the handle chute is opposite to the limiting bolt. The lower end of the limiting bolt is placed in the handle chute.

[0015] Further, the stent basket assembly includes a stent basket, a guiding microcatheter and a push rod. The stent basket is arranged at the distal end of the push rod. The guiding microcatheter is coaxially arranged with the stent basket. The proximal end of the stent basket is fixed on the tube body of the guiding microcatheter. The distal end of the stent basket is movably arranged at the distal end of the guiding microcatheter. The proximal end of the push rod extends outside the proximal end of the guiding microcatheter. During the process of delivering the stent basket assembly to the distal end of the blood vessel through the retrieval catheter, at least the distal ends of the stent basket and the guiding microcatheter are placed in the delivery tube. After pulling the connecting rod or pushing the push rod to move axially, the distal ends of the stent basket and the guiding microcatheter extend out from the distal end of the delivery tube, and the stent basket expands, so that the distal end of the stent basket abuts against the distal end of the guiding microcatheter, and at the same time, the thrombus in the blood vessel is captured.

[0016] Further, a second imaging mark is provided on the tube body at the distal end of the guiding microcatheter, and a fourth imaging mark is provided on the tube body of the guiding microcatheter and adjacent to the proximal end of the stent basket; a third imaging mark is provided at the distal end of the stent basket.

[0017] Compared with the prior art, in the present invention, by providing a retrieval catheter that can move axially along the operating handle, the pusher rod on the stent is fixed in the operating handle. Changing the relative position between the retrieval catheter and the stent can achieve the release and retrieval of the stent, enabling single-handed operation during the thrombectomy process, reducing the operation difficulty, reducing the number of extracorporeal instrument manipulations during the thrombectomy, and lowering the cooperation requirements between the operator and the assistant; when multiple thrombectomies are required, it can quickly establish a channel, shorten the operation time, and reduce the radiation exposure events and contrast agent dosage; the retrieval catheter is provided with a delivery tube and a pusher rod, and the proximal end of the pusher rod extends outside the human body. When sending the stent basket assembly to the distal end of the blood vessel, the guide wire needs to pass through the delivery tube, without the need to extend through the entire body of the retrieval catheter to the outside of the human body, achieving rapid exchange. When establishing a channel for multiple thrombectomies, it is not necessary to use an extended guide wire to establish a channel, reducing the operation range and lowering the operation difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the operation of the existing thrombectomy system Figure 1 .

[0019] Figure 2 is a schematic diagram of the operation of the existing thrombectomy system Figure 2 .

[0020] Figure 3 is a schematic diagram of the operation of the existing thrombectomy system Figure 3 .

[0021] Figure 4 is a schematic diagram of the operation of the existing thrombectomy system Figure 4 .

[0022] Figure 5 is a schematic diagram of the operation of the existing thrombectomy system Figure 5 .

[0023] Figure 6 is a schematic diagram of the operation of the existing thrombectomy system Figure 6 .

[0024] Figure 7 is a schematic structural diagram of the present invention.

[0025] Figure 8 is a schematic structural diagram of the stent after deployment of the present invention.

[0026] Figure 9 is a schematic structural diagram of the stent microcatheter of the present invention.

[0027] Figure 10 is a schematic structural diagram of the retrieval catheter of the present invention.

[0028] Figure 11 is a schematic structural diagram of the operating handle of the present invention.

[0029] Figure 12Schematic diagram of the thrombectomy operation of the present invention Figure 1 .

[0030] Figure 13 Schematic diagram of the thrombectomy operation of the present invention Figure 2 .

[0031] Figure 14 Schematic diagram of the thrombectomy operation of the present invention Figure 3 .

[0032] Figure 15 Schematic diagram of the thrombectomy operation of the present invention Figure 4 .

[0033] Figure 16 Schematic diagram of the thrombectomy operation of the present invention Figure 5 . Detailed implementation manner

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0035] In the present invention, the distal end refers to the end far from the surgical operator; the proximal end refers to the end close to the surgical operator.

[0036] As Figure 7 shown, the present invention discloses a rapid exchange type stent thrombectomy system, including an operating handle 5, a retrieval catheter 3, and a stent basket assembly 2, wherein:

[0037] The retrieval catheter 3 includes a delivery tube 32 and an elastic connecting rod 33. The delivery tube 32 is provided at the distal end of the connecting rod 33,

[0038] The retrieval catheter 3 is provided at the distal end of the operating handle 5. The proximal end of the connecting rod 33 extends into the operating handle 5 and can move axially along the operating handle 5. A first imaging marker 31 is provided on the tube body at the distal end of the delivery tube 32;

[0039] The stent basket assembly 2 includes a deployable and retractable stent basket 1 and a guiding microcatheter 22. The diameter of the guiding microcatheter 22 is smaller than that of the delivery tube 32, so that the guiding microcatheter 22 can axially move in the delivery tube 32. A second imaging marker 21 is provided on the tube body at the distal end of the guiding microcatheter 22. The stent basket 1 is sleeved on the distal end of the guiding microcatheter 22 and is fixedly connected to the guiding microcatheter 22. The stent basket 1 and the guiding microcatheter 22 are coaxially arranged. The distal end of the stent basket 1 is available for a guide wire to pass through. A third imaging marker 12 is provided at the distal end of the stent basket 1. The proximal end of the stent basket 1 has a push rod 11. The stent basket 1, the guiding microcatheter 22 and the push rod 11 are all arranged in the retrieval catheter 3, and thus can extend from the proximal end of the retrieval catheter 3 and be fixed in the handle 5. A fourth imaging marker 23 is provided on the tube body of the guiding microcatheter 22 and adjacent to the proximal end of the stent basket 1; the proximal end of the stent basket 1 is fixed on the tube body of the guiding microcatheter 22, and the distal end of the stent basket 1 is movably arranged at the distal end of the guiding microcatheter 22. When the push rod 11 is pulled, after the proximal end of the stent basket 1 enters the retrieval catheter 3, the stent basket 1 contracts and axially moves along the distal end of the guiding microcatheter 22 away from the distal end of the guiding microcatheter 22, so that the stent basket 1 contracts and is retrieved into the retrieval catheter 3; when no thrombus is captured ( Figure 7 as shown), the stent basket 1 is in a contracted state, the distal end of the stent basket 1 is located outside the distal end of the guiding microcatheter 22, and the stent basket 1 and the guiding microcatheter 22 are arranged in the delivery tube 32; when capturing a thrombus ( Figure 8 as shown), the retrieval catheter 3 is pushed towards the proximal direction of the operating handle 5, so that the stent basket 1 extends from the distal end of the delivery tube 32 and expands. After the distal end of the stent basket 1 expands, the distal end of the stent basket 1 abuts against the distal end of the guiding microcatheter 22 to capture the thrombus in the blood vessel.

[0040] Through the cooperation of the operating handle with the retrieval catheter 3 and the stent basket assembly 2, single-handed operation during the thrombectomy process is achieved, reducing the operation difficulty.

[0041] The present invention provides a delivery tube 32 and a push rod 33, reducing the penetration length of the guide wire 61 of the filter protection device 6 in the retrieval catheter. During operation, it is only necessary to pass the guide wire 61 through the guiding microcatheter 22 and the delivery tube 32 ( Figure 13 as shown), making it easier for the guide wire to penetrate from the distal end of the guiding microcatheter and the delivery tube and then exit from the proximal end of the delivery tube. Especially for some relatively long guiding catheters, the proximal end of the guide wire 61 does not need to exit from the proximal end of the present invention, so that the length of the guide wire can be greatly shortened, reducing the cost and thus reducing the manual participation degree.

[0042] As Figure 9As shown, the distal end and the proximal end of the stent basket 1 are respectively connected and fixed to the tube body of the guiding microcatheter 22 to ensure that the stent basket 1 can be deployed, and the third imaging marker 12 is adjacent to the second imaging marker 21.

[0043] In the present invention, the stent basket 1 is a grid-like cylindrical structure. The radial force magnitude, diameter, density of the grid, and pattern structure of the stent basket 1 are adjusted according to the clinical requirements of the device. The processing method of the stent basket 1 can be formed by laser cutting and shaping, and its material can be a metal with shape memory effect or a high-elastic polymer material.

[0044] The push rod 11 is made of a metal material, such as nickel-titanium alloy (Niti) or stainless steel.

[0045] Such as Figure 9 As shown, the distal end of the push rod 11 extends along the tube body of the guiding microcatheter 22 to the outside of the proximal end of the guiding microcatheter 22. The distal end of the push rod 11 can be fixed on the guiding microcatheter 22, but the present invention is not limited thereto. The distal end of the push rod 11 and the proximal end of the stent basket 1 can also be simultaneously fixed on the guiding microcatheter 22, or formed by cutting the proximal end of the guiding microcatheter 2 to reduce the process, or the push rod 11 and the stent basket 1 are integrally formed, and a part of the rod body of the push rod 11 is fixed on the tube body of the guiding microcatheter 2 and the proximal end of the push rod 11 extends to the outside of the proximal end of the guiding microcatheter 2. The tube body of the guiding microcatheter 22 has at least one layer, and the guiding microcatheter 22 is preferably a multi-layer tubular structure with at least two layers; the core wire of the filter protection device can pass through the distal end of the stent basket 1 and the lumen of the guiding microcatheter 22.

[0046] Such as Figure 10 As shown, the retrieval catheter 3 further includes a push tube 4. The diameter of the push tube 4 is smaller than that of the delivery tube 32. The push tube 4 and the delivery tube 32 can be connected by a connecting rod 33; the push tube 4 is arranged at the distal end of the operating handle 5. The first imaging marker 31 is arranged on the tube body at the distal end of the delivery tube 32. The proximal end of the push tube 4 is inserted into the operating handle 5. The inner diameter of the push tube 4 is larger than the sum of the diameter of the push rod 11 and the connecting rod 33 to ensure that there is enough space for the push rod 11 to pass through. The inner diameter of the delivery tube 32 is larger than the outer diameter of the guiding microcatheter 22. The stent basket 1 and the guiding microcatheter 22 are arranged in the delivery tube 32; specifically, the distal end of the connecting rod 33 is connected and fixed to the tube body at the proximal end of the delivery tube 32, and the proximal end of the connecting rod 33 is connected and fixed to the lumen at the distal end of the push tube 4 to realize that the lumens of the delivery tube 32 and the push tube 4 can be opposite to each other. The diameter of the delivery tube 32 is larger than that of the push tube 4; a two-stage catheter structure is adopted, so that the guide wire 61 of the filter protection device 6 extends out of the proximal end of the guiding microcatheter 22 and then extends to the outside of the proximal end from the guiding sub-catheter 7 of the guiding catheter ( Figure 13As shown, the guide wire 61 does not pass through the push tube 4 and the operating handle 5. Figure 13 As shown, when withdrawing, it is only necessary to withdraw the delivery tube 32 from the guide wire 61 to withdraw the entire system, avoiding the use of an extension guide wire and preventing the guide wire 61 from being entangled with the push rod 11.

[0047] In the present invention, the connecting rod 33 can be formed by cutting the tube wall of the delivery tube 32, or can be formed by a separately provided method, which is not specifically limited herein. Of course, it can also be formed by cutting the tube wall at the distal end of the push tube 4. If the connecting rod 33 is formed by cutting the tube wall of the delivery tube 32, the proximal end of the formed connecting rod 33 can be fixed in the lumen of the push tube 4; if the connecting rod 33 is formed by cutting the tube wall of the push tube 4, the distal end of the formed connecting rod 33 can be fixed to the body or lumen of the delivery tube 32; even a reduced-diameter catheter made by recycling the catheter 3 through an integral molding process can be used and then the connecting rod 33, the delivery tube 32 and the push tube 4 can be formed by cutting on the tube wall of the catheter.

[0048] In the present invention, the tube body of the delivery tube 32 has at least one layer, preferably a multi-layer tubular structure with at least two layers; the tube body of the push tube 4 has at least one layer, such as a single-layer tubular structure or a multi-layer tubular structure. The material of the push tube 4 is made of metal or polymer material. When it is a metal material, it can be nickel-titanium alloy (Niti) or stainless steel; when it is a polymer material, it can be, for example, polyimide (PI) or a composite material.

[0049] Such as Figure 7 and Figure 11 As shown, the operating handle 5 has a handle cavity 56 extending along the axial direction of the operating handle 5. The distal end of the operating handle 5 has a hole 57 communicating with the handle cavity 56. A push-pull handle 55 that can move axially along the handle cavity 56 is provided in the handle cavity 56. The distal end of the push-pull handle 55 extends out of the operating handle 5 to form an operating position for the operator. The push-pull handle 55 has a push-pull fixing through hole 58. The proximal end of the recovery catheter 3 is fixed in the push-pull fixing through hole 58 so that when the push-pull handle 55 is pushed towards the distal end or proximal end of the operating handle 5, the entire recovery catheter 3 is moved. The proximal end of the push rod 11 is fixed in the handle cavity 56 so that when the entire recovery catheter 3 is pushed and moved, the stent basket 1 is not pushed and moved; specifically, the proximal end of the push tube 4 is inserted into the push-pull fixing through hole 58 and fixed thereto.

[0050] Such as Figure 7 and Figure 11As shown, a loader 54 that can be pushed and moved together with the push-pull handle 55 is provided at the proximal end of the push-pull handle 55. A loader through cavity 59 is provided in the loader 54 so that the proximal end of the recovery catheter 3 can be inserted and connected thereto. At the same time, the proximal end of the push rod 11 extends from the proximal end of the loader 54 and is fixed in the handle cavity 56. A hemostatic valve 510 is provided at the proximal end of the loader through cavity 59. The proximal end of the push rod 11 passes through the hemostatic valve 510. Specifically, the hemostatic valve 510 has a through hole, and the push rod 11 passes through this through hole. The hemostatic valve 510 prevents blood from flowing out. The delivery tube 4 is inserted into the loader 54 and the lumen of the delivery tube 4 is connected to the loader through cavity 59. The hemostatic valve 510 is made of silicone material. The through hole is formed by a cut-through groove cut in the center of the hemostatic valve 510. The through hole can be cross-shaped or linear-shaped.

[0051] As Figure 11 shown, a three-way pipe 53 connected to the loader through cavity 59 through a pipeline is provided on the operating handle 5 to draw back blood through the three-way switch of the three-way pipe 53, prevent the formation of air embolism, and heparinized normal saline can be injected into the body through the three-way pipe 53 to play an anticoagulant role; specifically, a pipe joint connected to the loader through cavity 59 is provided on the loader 54, the pipeline is sleeved on the pipe joint, and the pipe joint is provided in the middle of the loader 54.

[0052] As Figure 11 shown, a limit bolt 51 is provided on the handle body of the operating handle 5. The limit bolt 51 is fixed at the proximal end of the push-pull handle 55 to prevent excessive pushing and affect the operation; a handle chute 511 is provided on the push-pull handle 55, and the lower end of the limit bolt 51 is placed in the handle chute 511 to limit the pushing distance of the pull handle 55.

[0053] As Figure 11 shown, for the convenience of operation, a raised push hand position 512 is provided around the push-pull handle 55 at the operating position to improve the convenience of single-handed operation.

[0054] In the present invention, the operating handle 5 is made of metal or polymer material. When it is made of metal material, it can be nickel-titanium alloy (Niti) or stainless steel. When it is made of polymer material, it can be polyoxymethylene (POM) or polypropylene (PP).

[0055] As Figure 1 shown, in the present invention, the push rod 11 can be fixed to the operating handle by providing rivet holes 513 at the proximal end of the operating handle, providing fixing holes 514 communicating with the handle cavity 56 inside the proximal end of the operating handle, the fixing holes 514 being in communication with the rivet holes 513, the fixing holes 514 being adapted to the push rod 11. After the proximal end of the push rod 11 is inserted into the fixing holes 514, a rivet 52 is riveted into the rivet holes 513 to press-fit and fix the proximal end of the push rod 11 in the fixing holes 514.

[0056] The first developing mark 31, the second developing mark 21, the third developing mark 12, and the fourth developing mark 23 are made of developing mark materials including but not limited to gold, platinum, tantalum, tungsten, platinum tungsten, platinum iridium, etc.

[0057] During operation, hold the operation handle 5 with one hand, and use the thumb and index finger to push the boss 512 of the push-pull handle 55 to drive the recovery catheter 3 to move along the axial direction of the operation handle 5, so that the delivery tube 32 releases (deploy) or recovers the stent.

[0058] The specific operation process of the present invention will be described in detail below.

[0059] 1. Insert the guiding catheter subcatheter 7 into the target blood vessel through the guiding catheter.

[0060] 2. As shown, under the guidance of the microcatheter 8, the filter protection device 6 is delivered to the distal end of the thrombus, and the microcatheter 8 is withdrawn. Figure 12 As shown, under the guidance of the microcatheter 8, the filter protection device 6 is delivered to the distal end of the thrombus, and the microcatheter 8 is withdrawn.

[0061] 3. As shown, place the quick-exchange stent thrombectomy system (system) of the present invention with the stent in a compressed state. Push the guiding microcatheter 22 and the delivery tube 32 of the stent basket assembly 2 along the guide wire 61 of the filter protection device 6 by pushing the operation handle 5, so that the system enters the blood vessel and is delivered to the distal end of the thrombus. The guide wire 61 does not pass through the push tube 4 and directly extends from the proximal end of the guiding catheter subcatheter 7. Figure 13 As shown, place the quick-exchange stent thrombectomy system (system) of the present invention with the stent in a compressed state. Push the guiding microcatheter 22 and the delivery tube 32 of the stent basket assembly 2 along the guide wire 61 of the filter protection device 6 by pushing the operation handle 5, so that the system enters the blood vessel and is delivered to the distal end of the thrombus. The guide wire 61 does not pass through the push tube 4 and directly extends from the proximal end of the guiding catheter subcatheter 7.

[0062] 4. As shown, hold the operation handle 5 with one hand, and use the thumb and index finger to push the push hand position 512 on the push-pull handle 55 to apply a proximal retraction force to the push-pull handle 55. The stent basket 1 then extends out of the recovery catheter 3, and at this time the stent basket 1 is in a deployed and released state. Figure 14 As shown, hold the operation handle 5 with one hand, and use the thumb and index finger to push the push hand position 512 on the push-pull handle 55 to apply a proximal retraction force to the push-pull handle 55. The stent basket 1 then extends out of the recovery catheter 3, and at this time the stent basket 1 is in a deployed and released state.

[0063] 5. As shown, during thrombectomy, withdraw the entire system along the filter protection device 6 into the guiding catheter subcatheter 7. Figure 15 As shown, during thrombectomy, withdraw the entire system along the filter protection device 6 into the guiding catheter subcatheter 7.

[0064] 6. Withdraw the system and the guiding catheter subcatheter 7 as a whole out of the body.

[0065] 7. If secondary thrombectomy is required, reinsert the guiding catheter subcatheter 7 into the target blood vessel along the filter protection device 6.

[0066] 8. Repeat steps 3 - 6.

[0067] The present invention has the following advantages:

[0068] 1. The thrombectomy process can be operated with one hand, reducing the operation difficulty.

[0069] 2. During the thrombectomy process, reduce the number of manipulations of extracorporeal devices (which requires simultaneous manipulation of the guiding catheter 7, microcatheter 8, and thrombectomy stent 9), reduce the cooperation requirements with the assistant, and lower the operation difficulty;

[0070] 3. During multiple thrombectomies, achieve rapid channel establishment, shorten the operation time, and reduce the radiation exposure time and contrast agent dosage.

[0071] 4. When establishing a channel during multiple thrombectomies, since the system does not need to be guided by the wire of the filter protection device as a whole, avoid using an extension wire to establish a channel, narrow the operation range, and reduce the operation difficulty.

Claims

1. A rapid exchange stent thrombectomy system, comprising a stent basket assembly (2), characterized in that: It also includes a retrieval catheter (3) for transporting the stent basket assembly (2) to the distal end of a blood vessel, and an operating handle (5); the retrieval catheter (3) includes a delivery tube (32) and a push tube (4); a connecting rod (33) is provided at the proximal end of the delivery tube (32), and the push tube (4) is arranged at the proximal end of the connecting rod (33); The operating handle (5) has a handle cavity (56) extending along the axial direction of the operating handle (5), and a push-pull handle (55) movable along the axial direction of the handle cavity (56) is provided in the handle cavity (56). The proximal end of the push tube (4) is fixed to the push-pull handle (55) so that after the push-pull handle (55) is pushed to move along the axial direction of the operating handle (5), the recovery catheter (3) is driven to move. The stent basket assembly (2) comprises a stent basket (1), a guide microcatheter (22) and a push rod (11); the stent basket (1) is arranged at the distal end of the push rod (11), and the proximal end of the stent basket (1) is fixed to the tube body of the guide microcatheter (22); By pushing the stent basket assembly (2) or pulling the connecting rod (33), the stent basket assembly (2) is relatively moved along the axial direction of the delivery tube (32), so that the stent basket assembly (2) extends from the distal end of the delivery tube (32) and expands to capture the thrombus.

2. The rapid exchange stent thrombectomy system according to claim 1, characterized in that: The proximal end of the support basket assembly (2) passes through the delivery tube (32) and extends out from the proximal end of the delivery tube (32).

3. The rapid exchange stent thrombectomy system according to claim 1, characterized in that: The distal end of the delivery tube (32) is provided with a first development mark (31).

4. The rapid exchange stent thrombectomy system according to claim 1 or 2, characterized in that: The proximal end of the support basket assembly (2) is fixed in the handle cavity (56).

5. The rapid exchange stent thrombectomy system according to claim 3, characterized in that: The distal end of the operating handle (5) is provided with a hole (57) communicating with the handle cavity (56), and the distal end of the push-pull handle (55) extends out of the operating handle (5).

6. The rapid exchange stent thrombectomy system according to claim 5, characterized in that: The proximal end of the push-pull handle (55) is provided with a loader (54) that can be pushed and moved together with the push-pull handle (55). A loader cavity (59) is provided in the loader (54) so that the proximal end of the push tube (4) passes through the push-pull handle (55) and is inserted into the loader (54) and communicates with the loader cavity (59). The loader cavity (59) also allows the proximal end of the support basket assembly (2) to extend from the proximal end of the loader (54) and be fixed in the handle cavity (56). A hemostatic valve (510) is provided in the proximal end of the loader cavity (59), and the proximal end of the support basket assembly (2) passes through the hemostatic valve (510).

7. The rapid exchange stent thrombectomy system according to claim 6, characterized in that: The operating handle (5) is provided with a three-way pipe (53) connected to the loader through-cavity (59) via a pipeline.

8. The rapid exchange stent thrombectomy system according to claim 7, characterized in that: The handle body of the operating handle (5) is provided with a limit bolt (51), which is fixed to the proximal end of the push-pull handle (55). The push-pull handle (55) is provided with a handle slide groove (511), which is opposite to the limit bolt (51), and the lower end of the limit bolt (51) is placed in the handle slide groove (511).

9. The rapid exchange stent thrombectomy system according to claim 1, characterized in that: The guide microcatheter (22) and the stent basket (1) are coaxially arranged, the distal end of the stent basket (1) is movably arranged at the distal end of the guide microcatheter (22), and the proximal end of the push rod (11) extends to the outside of the proximal end of the guide microcatheter (22); in the process of transporting the stent basket assembly (2) to the distal end of the blood vessel through the recovery catheter (3), at least the distal ends of the stent basket (1) and the guide microcatheter (22) are placed in the transport tube (32); after pulling the connecting rod (33) or pushing the push rod (11) to move axially, the distal ends of the stent basket (1) and the guide microcatheter (22) extend from the distal end of the transport tube (32), and the stent basket (1) is unfolded, so that the distal end of the stent basket (1) and the distal end of the guide microcatheter (22) are abutted against each other, thereby capturing the thrombus in the blood vessel.

10. The rapid exchange stent thrombectomy system according to claim 8, characterized in that: A second development mark (21) is provided on the distal end of the guide microcatheter (22), and a fourth development mark (23) is provided on the guide microcatheter (22) and adjacent to the proximal end of the support basket (1); and a third development mark (12) is provided on the distal end of the support basket (1).

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