A remotely controllable stent aspiration catheter

Abstract

This invention discloses a distally controllable stent aspiration catheter, relating to the field of medical device technology. It includes an outer tube, an inner tube, and a handle. The outer tube is sleeved outside the inner tube, with one end connected to the handle. The handle has a telescopic mechanism for moving the inner tube. The other end of the outer tube has a connecting mechanism with a head ring. A contrast-enhancing ring is connected to the end of the inner tube furthest from the handle, located inside the outer tube. An expandable flower-shaped tube is connected to the side of the contrast-enhancing ring furthest from the inner tube. Telescopic tubes are located at both ends of the inner side of the expandable flower-shaped tube, and a rolling belt is installed between the two ends. Both sides of the rolling belt are coated with polytetrafluoroethylene (PTFE). This invention allows the expandable flower-shaped tube to be pushed outward via the telescopic mechanism on the handle, expanding outward and automatically conforming to the blood vessel wall without requiring adjustment of the outer tube angle. This makes operation more convenient, compresses thrombi during movement, and reduces damage to the blood vessel wall.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a distally controllable stent aspiration catheter. Background Technology

[0002] Stent aspiration catheters are combined tools for mechanical thrombectomy, integrating stent grasping with the negative pressure aspiration function of the catheter. During the interventional procedure, the stent is first released and embedded in the thrombus. The aspiration catheter is then advanced along the guidewire to the vicinity of the thrombus. Continuous negative pressure aspiration reduces the risk of distal embolism and assists the stent in pulling the thrombus out entirely. This combined technique (such as the SWIM technique) can improve vascular recanalization rates and is particularly suitable for the treatment of acute ischemic stroke or peripheral arterial embolism.

[0003] Thrombi are typically removed using a suction catheter, such as the suction catheter described in patent publication number CN117355267A, which includes a support catheter and a suction catheter extending through the support catheter. The catheter assembly may include a distal valve device capable of controlling the vacuum level at the distal end of the catheter system. Flushing can flow between the support catheter and the suction catheter to flush the catheter assembly.

[0004] The aspiration catheter can be moved along the microguidewire to the thrombus, and then the thrombus can be aspirated from the other end of the aspiration catheter to perform thrombectomy. However, the distal ends of the above-mentioned aspiration catheters and existing aspiration catheters are designed with flat or oblique openings, which are not easy to fit the blood vessel wall. The direction needs to be adjusted, which can easily cause the thrombus to break and escape, resulting in unsatisfactory thrombectomy results. Summary of the Invention

[0005] The purpose of this invention is to provide a distally controllable stent aspiration catheter to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a distal controllable stent aspiration catheter, comprising an outer tube, an inner tube, and a handle. The outer tube is sleeved on the outside of the inner tube, one end of the outer tube is connected to the handle, and the handle is provided with a telescopic mechanism for moving the inner tube. The other end of the outer tube is provided with a connecting mechanism, and the connecting mechanism has a head end ring. The end of the inner tube away from the handle is connected to a developing ring, which is located inside the outer tube. The side of the developing ring away from the inner tube is connected to an expansion flower tube, and both ends of the inner side of the expansion flower tube are provided with telescopic tubes. A rolling belt is installed between the telescopic tubes at both ends, and both sides of the rolling belt are provided with a polytetrafluoroethylene coating.

[0007] Preferably, the telescopic tube includes an outer rod and an inner rod fixed inside the expansion flower-shaped tube. The outer rod has a sliding hole in the middle, and the inner rod is inserted into the sliding hole. A limiting groove is provided on the side wall of the outer rod, and a stop block is fixed on the inner rod. The stop block is slidably disposed in the limiting groove. A rotating sleeve is rotatably disposed on the outer side of the outer rod, and a rolling belt is sleeved on the outer side of the rotating sleeve. A limiting ring is provided at the end of the outer rod, and the rotating sleeve is located between the limiting ring and the stop block.

[0008] Preferably, the outer side of the expansion flower-shaped tube is covered with an elastic film, and the outer side of the elastic film is coated with a polytetrafluoroethylene coating.

[0009] Preferably, the handle has an internal cavity, and one end of the inner tube is inserted into the cavity. The handle has two symmetrically distributed sliding grooves, and a push block is slidably disposed in the sliding groove. One end of the push block is connected to the outer surface of the inner tube, and the other end is located on the outside of the handle.

[0010] Preferably, the connecting mechanism includes a nickel-titanium alloy spring fixed to the end of the inner tube, and the other end of the nickel-titanium alloy spring is connected to the developing ring. The inner side of the head end ring is provided with a plurality of circumferentially distributed fan-shaped cavities. An elastic metal sheet is provided inside the fan-shaped cavity, and a limiting tongue is fixed in the middle position of the elastic metal sheet. A connecting hole is opened between the fan-shaped cavity and the inside of the head end ring, and the limiting tongue is located in the corresponding connecting hole. Chamfers are opened on both sides of the limiting tongue.

[0011] Preferably, the telescopic mechanism further includes a sliding frame slidably disposed in the slide groove, a spring groove is provided on the side wall of the slide groove near the front end of the handle, and a return spring is provided in the spring groove. The other end of the return spring abuts against the sliding frame, and the push block is slidably disposed in the sliding frame. A damping rubber layer is provided on the inner side of the sliding frame, and the damping rubber layer abuts against the surface of the push block.

[0012] Preferably, a number of split pieces are fixed on the inner side of the end of the inner tube near the developing ring, and the inner side of the inner tube is also equipped with fiber optic enamel cavity sensors of the same number as the split pieces for detecting the internal pressure of the inner tube, and the split pieces are aligned with the fiber optic enamel cavity sensors.

[0013] Preferably, the connecting mechanism includes several pull rods fixed to the end of the inner tube, and a first fixing block is provided on the inner side of the other end of the pull rod. A telescopic groove is provided on the outer side of the developing ring, and a second fixing block is provided at the end of the telescopic groove near the inner tube. The first fixing block is slidably disposed on the inner side of the telescopic groove. Several circumferentially distributed fan-shaped cavities are provided on the inner side of the head end ring. An elastic metal sheet is provided inside the fan-shaped cavity, and a limiting tongue is fixed at the middle position of the elastic metal sheet. A connecting hole is provided between the fan-shaped cavity and the inside of the head end ring, and the limiting tongue is located in the corresponding connecting hole. Chamfers are provided on both sides of the limiting tongue.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The expandable flower-shaped tube can be pushed outward by the telescopic mechanism on the handle. The expandable flower-shaped tube expands outward and automatically fits the blood vessel wall. There is no need to adjust the angle of the outer tube, making the operation more convenient and reducing damage to the blood vessel wall.

[0016] Moreover, the expansion tube expands at one end and does not expand at the other end, thus forming a funnel-shaped structure. The thrombus will enter the inner tube along the funnel-shaped structure formed by the expansion tube. When moving, the rolling belt adheres to the surface of the thrombus and drives the rolling belt to rotate, which generates rolling friction between the rolling belt and the surface of the thrombus and squeezes the thrombus as it moves, reducing the probability of thrombus rupture and thus preventing the thrombus from splitting and escaping.

[0017] Meanwhile, when it adheres to the blood vessel wall, the internal pressure becomes too high, forcing the imaging ring to contract inward and cross the limiting tongue. Under the action of the internal and external pressure difference, the expanding flower-shaped tube detaches from the thrombus and contracts towards the inside of the outer tube. At this point, aspiration can be stopped to prevent damage to the blood vessel wall. Moreover, the contraction distance of the expanding flower-shaped tube is limited. Afterward, the inner tube is pushed forward again by the telescopic mechanism, bringing the expanding flower-shaped tube closer to the thrombus again for aspiration. This process is repeated until the thrombus is removed, which can prevent frequent contraction and expansion of the expanding flower-shaped tube from causing damage or deformation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the distal cross-sectional structure of Embodiment 1 of the present invention;

[0020] Figure 3 This is a schematic cross-sectional view of the head end ring in this invention;

[0021] Figure 4 This is a schematic diagram of the disassembled structure of the telescopic tube in this invention;

[0022] Figure 5 This is a cross-sectional view of the handle in this invention;

[0023] Figure 6 This is a schematic diagram of the distal cross-sectional structure of Embodiment 2 of the present invention;

[0024] Figure 7 This is a schematic diagram of the disassembled structure of the connecting mechanism in Embodiment 2 of the present invention.

[0025] In the diagram: 1. Outer tube; 2. Handle; 3. Inner tube; 4. Head end ring; 5. Developing ring; 6. Expanding flower-shaped tube; 7. Rolling belt; 8. Outer rod; 9. Sliding hole; 10. Limiting ring; 11. Limiting groove; 12. Rotating sleeve; 13. Inner rod; 14. Stop block; 15. Cavity; 16. Sliding groove; 17. Push block; 18. Sliding frame; 19. Reset spring; 20. Nickel-titanium alloy spring; 21. Sector cavity; 22. Elastic metal sheet; 23. Limiting tongue; 24. Split plate; 25. Fiber optic enamel cavity sensor; 26. Pull rod; 27. First fixing block; 28. Telescopic groove; 29. ​​Second fixing block. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1:

[0028] The aspiration catheter has an expandable stent at the tip. After the stent is deployed, it expands and fits against the inner side of the blood vessel wall, which can better fit the blood vessel wall and prevent the thrombus from escaping under the impact of blood flow, thereby achieving a better thrombectomy operation.

[0029] like Figures 1-5 As shown, the present invention provides a technical solution: a distal controllable stent aspiration catheter, comprising an outer tube 1, an inner tube 3, and a handle 2. The outer tube 1 is sleeved on the outside of the inner tube 3. One end of the outer tube 1 is connected to the handle 2, and the handle 2 is provided with a telescopic mechanism for moving the inner tube 3. The other end of the outer tube 1 is provided with a connecting mechanism, and the connecting mechanism has a head end ring 4. The end of the inner tube 3 away from the handle 2 is connected to a developing ring 5, which is located inside the outer tube 1. The side of the developing ring 5 away from the inner tube 3 is connected to an expansion flower tube 6, and both ends of the inner side of the expansion flower tube 6 are provided with telescopic tubes. A rolling belt 7 is installed between the two telescopic tubes, and both sides of the rolling belt 7 are provided with a polytetrafluoroethylene coating.

[0030] It is important to note that the telescopic mechanism on handle 2 is used to push the inner tube 3 forward or retract it backward. When the inner tube 3 is extended, the imaging ring 5 and the expanding flower-shaped tube 6 move forward. At this time, the expanding flower-shaped tube 6 expands outward and automatically conforms to the blood vessel wall, eliminating the need to adjust the angle of the outer tube 1. This makes operation more convenient and reduces damage to the blood vessel wall. At this time, one end of the expanding flower-shaped tube 6 expands while the other end does not, thus forming a funnel-shaped structure. The rolling belt 7 is evenly distributed along the circumference of the funnel-shaped inclined surface, allowing for electric or manual aspiration from handle 2. The thrombus enters the inner tube 3 along the funnel-shaped structure formed by the expanding flower-shaped tube 6. During movement, the rolling belt 7 adheres to the surface of the thrombus, causing the rolling belt 7 to rotate. This generates rolling friction between the rolling belt 7 and the surface of the thrombus, and squeezes the thrombus as it moves, facilitating the suction of the thrombus. It does not cause sliding friction on the surface of the thrombus when squeezing it, reducing the probability of thrombus rupture and preventing the thrombus from breaking apart and escaping. After use, the expanding flower-shaped tube 6 can be retracted into the inner side of the outer tube 1 through the telescopic mechanism, making it easy to remove the outer tube 1 as a whole.

[0031] Furthermore, the expandable flower-shaped tube 6 is a prior art product, such as the expandable component in the aspiration catheter with patent publication number CN119279693A. The specific principle and usage method are prior art and will not be elaborated here. Moreover, in this embodiment, the expandable flower-shaped tube 6 contains a radiopaque wire and a radiopaque ring 5, which makes positioning during surgery more convenient.

[0032] like Figure 4 As shown, the telescopic tube includes an outer rod 8 and an inner rod 13 fixed inside the expansion flower-shaped tube 6. The outer rod 8 has a sliding hole 9 in the middle, and the inner rod 13 is inserted into the sliding hole 9. A limiting groove 11 is opened on the side wall of the outer rod 8, and a stop block 14 is fixed on the inner rod 13. The stop block 14 is slidably disposed in the limiting groove 11, and a rotating sleeve 12 is rotatably disposed on the outer side of the outer rod 8. A rolling belt 7 is sleeved on the outer side of the rotating sleeve 12. A limiting ring 10 is provided at the end of the outer rod 8, and the rotating sleeve 12 is located between the limiting ring 10 and the stop block 14.

[0033] It should be noted that during use, the outer rod 8 and the inner rod 13 can be completely folded together, thereby reducing the overall length. This makes it easier to retract the expansion flower tube 6 inside the inner tube 3. Moreover, after the expansion flower tube 6 is opened, the outer rod 8 and the inner rod 13 extend. At this time, the limiting ring 10 and the stop block 14 can reduce the distance between them, thereby restricting the position of the rotating sleeve 12, reducing its offset, and preventing jamming or other situations from occurring.

[0034] like Figure 2 As shown, the outer side of the expansion flower tube 6 is covered with an elastic film, and the outer side of the elastic film is coated with a polytetrafluoroethylene coating.

[0035] It should be noted that the elastic film can seal the holes of the expansion tube 6 to prevent air leakage and improve the adsorption strength, while the polytetrafluoroethylene coating can improve the surface lubricity of the elastic film, making it easier to push out or retract the expansion tube 6, making the operation more convenient and less labor-intensive.

[0036] like Figure 5 As shown, the handle 2 has a cavity 15 inside, and one end of the inner tube 3 is inserted into the cavity 15. The handle 2 has two symmetrically distributed sliding grooves 16, and a push block 17 is slidably disposed in the sliding groove 16. One end of the push block 17 is connected to the outer surface of the inner tube 3, and the other end is located on the outside of the handle 2.

[0037] It should be noted that during the operation, pushing the two push blocks 17 can move the inner tube 3 forward or backward. The inner tube 3 can push or pull the imaging ring 5 to move through the connecting mechanism, which in turn moves the expansion flower tube 6. The outer side of the expansion flower tube 6 and the eaves pad of the head ring 4 can automatically compress the expansion flower tube 6 when it contracts.

[0038] like Figure 2 and Figure 3 As shown, the connecting mechanism includes a nickel-titanium alloy spring 20 fixed to the end of the inner tube 3, and the other end of the nickel-titanium alloy spring 20 is connected to the developing ring 5. The inner side of the head end ring 4 is provided with a number of circumferentially distributed fan-shaped cavities 21. An elastic metal sheet 22 is provided inside the fan-shaped cavity 21, and a limiting tongue 23 is fixed in the middle position of the elastic metal sheet 22. A connecting hole is opened between the fan-shaped cavity 21 and the inside of the head end ring 4, and the limiting tongue 23 is located in the corresponding connecting hole, and chamfers are opened on both sides of the limiting tongue 23.

[0039] It should be noted that when the expansion flower tube 6 is pushed outward, the nickel-titanium alloy spring 20 is compressed, providing support between the inner tube 3 and the developing ring 5, until the developing ring 5 is pushed to the outside of the limiting tongue 23. When it contacts the limiting tongue 23, the limiting tongue 23 can be compressed into the fan-shaped cavity 21 by the chamfer on the limiting tongue 23, and overcome the elastic force of the elastic metal sheet 22. After being pushed out, the limiting tongue 23 is reset under the elastic force of the elastic metal sheet 22. At this time, the inner tube 3 moves backward under the action of the telescopic mechanism and stretches the nickel-titanium alloy spring 20.

[0040] When the thrombus adheres to the blood vessel wall, the internal pressure becomes too high. The imaging ring 5 is forced to contract inward and cross the limiting tongue 23. Under the pulling force of the nickel-titanium alloy spring 20 and the pressure difference between the inside and outside, the expanding flower-shaped tube 6 detaches from the thrombus and contracts into the outer tube 1. At this point, aspiration can be stopped to prevent damage to the blood vessel wall.

[0041] Then, the inner tube 3 is pushed forward again by the telescopic mechanism, and the expanded flower-shaped tube 6 is brought closer to the thrombus again for suction. This process is repeated until the thrombus is removed.

[0042] like Figure 5 As shown, the telescopic mechanism also includes a sliding frame 18 that is slidably disposed in the slide groove 16. A spring groove is provided on the side wall of the slide groove 16 near the front end of the handle 2, and a return spring 19 is provided in the spring groove. The other end of the return spring 19 abuts against the sliding frame 18, and the push block 17 is slidably disposed in the sliding frame 18. A damping rubber layer is provided on the inner side of the sliding frame 18, and the damping rubber layer abuts against the surface of the push block 17.

[0043] It should be noted that when the pusher 17 is pushed forward, it can move the sliding frame 18 to the front end of the slide groove 16, and at the same time move the pusher 17 to the front end of the sliding frame 18, thereby achieving the effect of pushing out the expansion flower tube 6. After releasing, the reset spring 19 will push the sliding frame 18 backward. At this time, the pusher 17 and the inner tube 3 will move backward synchronously and stretch the nickel-titanium alloy spring 20. However, the pusher 17 will still remain at the front end of the sliding frame 18. Continuing to push backward will allow the nickel-titanium alloy spring 20 to retract the contrast ring 5 and the expansion flower tube 6 into the inner side of the outer tube 1. When the expansion flower tube 6 is adsorbed onto the blood vessel wall and automatically retracts backward, the nickel-titanium alloy spring 20 will contract and stop moving the contrast ring 5, so that the expansion flower tube 6 only contracts a part. Pushing one end of the distance will be enough to re-absorb the thrombus. The operation is simpler and can prevent the frequent contraction and expansion of the expansion flower tube 6 from causing damage or deformation.

[0044] like Figure 2 As shown, a number of split pieces 24 are fixed on the inner side of the inner tube 3 near the developing ring 5, and the same number of fiber optic enamel cavity sensors 25 as the split pieces 24 are also installed on the inner side of the inner tube 3 to detect the internal pressure of the inner tube 3, and the split pieces 24 are aligned with the fiber optic enamel cavity sensors 25.

[0045] It should be noted that the splitting blade 24 can separate the passing thrombus, making it easier to aspirate, and the fiber optic Fabry-Perot cavity sensor 25, which is aligned with the splitting blade 24, can avoid direct contact with the thrombus, thus improving detection accuracy.

[0046] Example 2:

[0047] In Embodiment 1, the inner tube 3 and the developing ring 5 are connected by a nickel-titanium alloy spring 20. When the inner tube 3 is pulled, the developing ring 5 is contracted by the tension of the nickel-titanium alloy spring 20. However, the elasticity control of the nickel-titanium alloy spring 20 is difficult to be precise, which may result in the situation where it is difficult to pull the developing ring 5. Therefore, this embodiment provides another connection mechanism.

[0048] like Figure 6 and Figure 7As shown, the connecting mechanism includes several pull rods 26 fixed to the end of the inner tube 3, and a first fixing block 27 is provided on the inner side of the other end of the pull rod 26. A telescopic groove 28 is provided on the outer side of the developing ring 5, and a second fixing block 29 is provided on the end of the telescopic groove 28 near the inner tube 3. The first fixing block 27 is slidably disposed on the inner side of the telescopic groove 28. Several circumferentially distributed fan-shaped cavities 21 are provided on the inner side of the head end ring 4. An elastic metal sheet 22 is provided inside the fan-shaped cavity 21, and a limiting tongue 23 is fixed at the middle position of the elastic metal sheet 22. A connecting hole is provided between the fan-shaped cavity 21 and the inside of the head end ring 4, and the limiting tongue 23 is located in the corresponding connecting hole, and chamfers are provided on both sides of the limiting tongue 23.

[0049] It should be noted that the internal structure of the head ring 4 is the same as that in Embodiment 1, and will not be described again. When the inner tube 3 moves backward, the pull rod 26 moves backward synchronously. At this time, the first fixing block 27 will abut against the second fixing block 29, thereby driving the developing ring 5 to move backward. It can be pulled directly without the need for elastic force, which is more direct. Moreover, when the developing ring 5 is pushed out, the first fixing block 27 will abut against the side wall of the telescopic groove 28, and under the action of the return spring 19, it has space to move backward without affecting the function.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A distally controllable stent-aspiration catheter comprising an outer tube (1), an inner tube (3) and a handle (2), characterized in that: The outer tube (1) is sleeved outside the inner tube (3), one end of the outer tube (1) is connected to the handle (2), the handle (2) is provided with a telescopic mechanism for moving the inner tube (3), the other end of the outer tube (1) is provided with a connecting mechanism, the connecting mechanism is provided with a head end ring (4), one end of the inner tube (3) away from the handle (2) is connected with a developing ring (5), the developing ring (5) is located inside the outer tube (1), one side of the developing ring (5) away from the inner tube (3) is connected with an expanded pattern tube (6), both ends of the inside of the expanded pattern tube (6) are provided with telescopic tubes, a rolling belt (7) is installed between the telescopic tubes at both ends, both sides of the rolling belt (7) are provided with a Teflon coating, the telescopic tube comprises a rotating sleeve (12), the rolling belt (7) is sleeved outside the telescopic tube through the rotating sleeve (12), one end of the expanded pattern tube (6) is expanded and the other end is not expanded, thereby forming a funnel-shaped structure, the thrombus enters the inner tube (3) along the funnel-shaped structure formed by the expanded pattern tube (6), and when moving, the rolling belt (7) is attached to the surface of the thrombus to drive the rolling belt (7) to rotate, so that the rolling belt (7) and the surface of the thrombus produce rolling friction and extrude the thrombus with the movement of the thrombus, thereby reducing the probability of thrombus blockage and preventing the thrombus blockage from escaping.

2. A distally controllable stent suction catheter according to claim 1, characterized in that: The telescopic tube further comprises an outer rod (8) and an inner rod (13) fixed inside the expanded pattern tube (6), a sliding hole (9) is formed in the middle of the outer rod (8), and the inner rod (13) is inserted into the sliding hole (9), a limiting groove (11) is formed in the side wall of the outer rod (8), and a stop block (14) is fixed on the inner rod (13), the stop block (14) is slidably arranged in the limiting groove (11), the rotating sleeve (12) is rotatably arranged outside the outer rod (8), the rolling belt (7) is sleeved outside the rotating sleeve (12), and the end of the outer rod (8) is provided with a limiting ring (10), and the rotating sleeve (12) is located between the limiting ring (10) and the stop block (14).

3. A distally controllable stent suction catheter according to claim 1, characterized in that: The outside of the expanded pattern tube (6) is coated with an elastic film, and the outside of the elastic film is coated with a Teflon coating.

4. The distally controllable stent suction catheter of claim 1, wherein: The inside of the handle (2) is provided with a cavity (15), one end of the inner tube (3) is inserted inside the cavity (15), two symmetrically distributed sliding grooves (16) are formed in the handle (2), a push block (17) is slidably arranged in the sliding groove (16), one end of the push block (17) is connected to the outer surface of the inner tube (3), and the other end is located outside the handle (2).

5. A distally controllable stent suction catheter according to claim 4, characterized in that: The connecting mechanism comprises a nickel-titanium alloy spring (20) fixed at the end of the inner tube (3), the other end of the nickel-titanium alloy spring (20) is connected to the developing ring (5), the inside of the head end ring (4) is provided with a plurality of circumferentially distributed fan-shaped cavities (21), the inside of the fan-shaped cavity (21) is provided with an elastic metal sheet (22), the middle position of the elastic metal sheet (22) is fixed with a limiting tongue (23), a communication hole is formed between the fan-shaped cavity (21) and the inside of the head end ring (4), the limiting tongue (23) is located in the corresponding communication hole, and chamfers are formed on both sides of the limiting tongue (23).

6. A distally controllable stent suction catheter according to claim 5, characterized in that: The telescopic mechanism further comprises a sliding frame (18) slidingly arranged in the sliding groove (16), the sliding groove (16) is provided with a spring groove on the side wall near the front end of the handle (2), and the spring groove is provided with a reset spring (19), one end of the reset spring (19) is in abutment with the sliding frame (18), and the push block (17) is slidingly arranged in the sliding frame (18), and the inner side of the sliding frame (18) is provided with a damping rubber layer, and the damping rubber layer is in abutment with the surface of the push block (17).

7. A distally controllable stent suction catheter according to claim 1, characterized in that: The inner tube (3) is fixed with a plurality of split pieces (24) on the inner side of one end near the developing ring (5), and the inner side of the inner tube (3) is further provided with a plurality of optical fiber cavity sensors (25) which are the same in number as the split pieces (24), for detecting the internal pressure of the inner tube (3), and the split pieces (24) are aligned with the optical fiber cavity sensors (25).

8. The distally controllable stent suction catheter of claim 1, wherein: The connecting mechanism comprises a plurality of pull rods (26) fixed at the end of the inner tube (3), and the other end of the pull rod (26) is provided with a first fixed block (27) on the inner side, the outer side of the developing ring (5) is provided with a telescopic groove (28), and the other end of the pull rod (26) is provided with a second fixed block (29) on the inner side near the inner tube (3), the first fixed block (27) is slidingly arranged in the inner side of the telescopic groove (28), the inner side of the head ring (4) is provided with a plurality of circumferentially distributed fan-shaped cavities (21), the fan-shaped cavities (21) are provided with elastic metal sheets (22) inside, and the middle positions of the elastic metal sheets (22) are fixed with limiting tongues (23), the fan-shaped cavities (21) and the inner side of the head ring (4) are provided with communication holes, the limiting tongues (23) are located in the corresponding communication holes, and the two sides of the limiting tongues (23) are provided with chamfers.

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