One-way valve suction catheter

Abstract

The application discloses a one-way valve type suction catheter, relates to the technical field of thrombus suction, and comprises a catheter body, a flow blocking mechanism is arranged on the outer wall of the catheter body close to the opening end of the catheter body, and a driving mechanism is arranged in the catheter body; when the catheter body is used for suction, blood flow drives the driving mechanism to move, the driving mechanism drives the flow blocking mechanism to expand, and the flow blocking mechanism blocks the blood flow in the annular gap between the outer wall of the catheter body and the inner wall of a blood vessel; when the catheter body stops suction, the flow blocking mechanism is retracted into the outer wall of the catheter body. When the thrombus is sucked, the blood flow is sucked into the catheter body, the blood flow drives the flow blocking mechanism to expand through the driving mechanism, the expanded flow blocking mechanism blocks the blood flow in the annular gap between the outer wall of the catheter body and the inner wall of the blood vessel, the suction force of the catheter body on the thrombus is improved, and therefore the suction and capture effect of the thrombus is improved.

Description

Technical Field

[0001] This application relates to the field of thrombus aspiration technology, and in particular to a one-way valve aspiration catheter. Background Technology

[0002] A thrombus is a blood clot that forms within a blood vessel, usually caused by slow blood flow, vascular damage, or a hypercoagulable state. It can obstruct blood vessels, leading to ischemia and hypoxia in downstream tissues, and is a direct cause of fatal diseases such as myocardial infarction. Timely removal of the thrombus and restoration of blood flow are crucial for treatment; clinically, interventional treatments such as thrombolysis with medication or catheter-based thrombectomy are commonly used.

[0003] Currently, thrombectomy catheters are an important mechanical thrombectomy device widely used in clinical practice. Their typical working principle is as follows: under image guidance, the catheter is delivered to the thrombus site; suction is generated by an external negative pressure suction device connected to the proximal end of the catheter, drawing the thrombus out of the body through the catheter lumen.

[0004] However, in actual aspiration procedures, existing thrombus aspiration catheters exhibit a significant technical deficiency: during aspiration, the suction force not only acts on the catheter opening (the target thrombus) but also draws blood flow backward along the annular gap (i.e., the external flow channel) between the catheter's outer wall and the vessel's inner wall. This portion of blood, which should flow to distal tissues, is aspirated into the catheter, creating an ineffective shunt that bypasses the catheter and enters the lumen, significantly reducing the suction force exerted by the catheter on the thrombus itself. Due to insufficient effective suction, the thrombus may not be effectively broken up, captured, and aspirated into the catheter, especially for tough or large thrombi, leading to difficulty in aspiration or only the removal of thrombus fragments. Summary of the Invention

[0005] To improve the thrombus aspiration and capture effect, this application provides a one-way valve aspiration catheter.

[0006] The one-way valve-type aspiration catheter provided in this application adopts the following technical solution: A one-way valve-type aspiration catheter includes a catheter body. A flow-blocking mechanism is provided on the outer wall of the catheter body near its own opening end. A driving mechanism is provided inside the catheter body. When the catheter body performs aspiration, the blood flow drives the driving mechanism to move. The driving mechanism drives the flow-blocking mechanism to unfold. The flow-blocking mechanism blocks the blood flow in the annular gap between the outer wall of the catheter body and the inner wall of the blood vessel. When the catheter body stops aspiration, the flow-blocking mechanism retracts into the outer wall of the catheter body.

[0007] By adopting the above technical solution, when aspirating thrombi, blood flow is drawn into the catheter body. The blood flow drives the flow-blocking mechanism to unfold through the driving mechanism. The unfolded flow-blocking mechanism blocks the blood flow in the annular gap between the outer wall of the catheter body and the inner wall of the blood vessel, thereby increasing the suction force of the catheter body on the thrombus and thus increasing the thrombus aspiration and capture effect.

[0008] Preferably, the flow-blocking mechanism includes a flow-blocking membrane and at least three elastic metal wires. A receiving annular groove is formed on the outer side wall of the conduit body along its circumference. The flow-blocking membrane is located in the receiving annular groove. The elastic metal wires are arranged in the receiving annular groove along the axial direction of the conduit body. The multiple elastic metal wires are arranged at equal intervals along the circumference of the conduit body. The flow-blocking membrane is fixedly connected to the multiple elastic metal wires and is located on the side of the elastic metal wires near the opening end of the conduit body. The end of the elastic metal wire near the opening end of the conduit body is a fixed end and is fixedly connected to the conduit body, while the end away from the opening end of the conduit body is a movable end and is transmittedly connected to the driving mechanism.

[0009] By adopting the above technical solution, when blood is drawn into the catheter body, the blood flow drives the drive mechanism to move. The drive mechanism drives the moving end of the elastic metal wire to move towards the fixed end. The middle part of the elastic metal wire bends and arches, and drives the choke membrane to move out of the receiving ring groove. At this time, the tilted and unfolded choke membrane can block the blood flow in the annular gap between the outer wall of the catheter body and the inner wall of the blood vessel. When the catheter body stops aspiration, the elastic metal wire drives the choke membrane to return to the receiving ring groove.

[0010] Preferably, the catheter body has multiple guide frames evenly spaced along its circumference on the side of the receiving annular groove away from the fixed end of the elastic metal wire. Each guide frame has a guide block slidably installed along the axial direction of the catheter body. The moving ends of the multiple elastic metal wires pass through the guide frames and are fixedly connected to the guide blocks. The guide blocks are connected to the driving mechanism.

[0011] By adopting the above technical solution, the driving mechanism drives the guide block to move in the guide frame, and the guide block drives the moving end of the elastic metal wire to move, making the movement of the elastic metal wire more stable, thereby improving the stability of the flow-blocking membrane in blocking blood flow.

[0012] Preferably, the driving mechanism includes multiple push plates and a pull rope. A first sliding groove is formed on the inner wall of the catheter body along its own axis. The outer end of the push plate is slidably disposed in the first sliding groove. A connecting hole is formed in the catheter body. The two ends of the connecting hole are respectively connected to the inner cavity of the guide frame and the first sliding groove. The pull rope is located in the connecting hole, and the two ends of the pull rope are respectively fixedly connected to the guide block and the push plate.

[0013] By adopting the above technical solution, when blood is drawn into the catheter body, the blood will push the push plate to move in the first slide groove. The push plate will drive the pull rope to move in the connection hole. The pull rope will then pull the guide block to move in the guide frame, thereby driving the moving end of the elastic metal wire to move.

[0014] Preferably, the catheter body has a second groove on the inner side wall of the first groove, and the end of the push plate is fixedly provided with a rotating shaft, which is slidably disposed in the second groove.

[0015] By adopting the above technical solution, the push plate moves and drives the rotating shaft to slide in the second slide groove. The rotating shaft and the second slide groove cooperate to guide the sliding of the push plate, thereby improving the stability of the push plate movement.

[0016] Preferably, the rotating shaft is rotatably disposed in the second slide groove, the outer end of the push plate is formed with a rounded corner on the side away from the opening end of the conduit body, the conduit body is provided with a relief groove on the side of the inner wall of the first slide groove away from the opening end of the conduit body, the push plate is disposed along the diameter direction of the conduit body, the outer end wall of the push plate moves to abut against the inner wall of the first slide groove, and the rounded corner of the push plate rotates to abut against the inner wall of the relief groove.

[0017] By adopting the above technical solution, when blood pushes the push plate to move, the end wall of the push plate abuts against the inner wall of the first groove, so that the push plate maintains the diameter direction of the catheter body, which facilitates the blood to push the push plate to move. When the push plate drives the moving end of the elastic metal wire to move, the push plate moves to the clearance groove. At this time, the end wall of the push plate disengages from the inner wall of the first groove. Under the action of the rotating shaft, the blood pushes the push plate to rotate in the direction of blood flow. The rounded corner of the push plate rotates to abut against the inner wall of the clearance groove, so that the push plate maintains an inclined state, reducing the resistance of the push plate to blood flow and facilitating the aspiration of thrombi by the catheter body.

[0018] Preferably, the push plate includes a first plate and a second plate, the width of the second plate being greater than the width of the first plate. The rotating shaft and the rounded corner are both disposed on the first plate. The first plate is slidably disposed in the first groove, and the second plate is rotatably disposed at the end of the first plate away from the first groove. A locking rod for locking the second plate is disposed inside the first plate. When the outer end wall of the push plate abuts against the inner wall of the first groove, the locking rod is inserted into the second plate and locks the second plate. When the push plate moves into the clearance groove and rotates, the locking rod releases the lock on the second plate.

[0019] By adopting the above technical solution, when blood pushes the push plate to move, the first plate moves within the first groove, and the first plate drives the second plate to move. At this time, the locking rod locks the second plate, preventing it from rotating. The second plate increases the contact area between the push plate and the blood flow, making it easier for the blood flow to push the push plate to move. When the push plate moves to the clearance groove, the first plate rotates under the action of the pivot, and the locking rod releases the lock on the second plate. At this time, the second plate rotates under the action of the blood flow, thereby reducing the contact area between the push plate and the blood flow, making it easier for the catheter body to aspirate thrombi.

[0020] Preferably, a locking groove is provided in the second plate. When the end wall of the first plate abuts against the inner wall of the first sliding groove, one end of the locking rod abuts against the inner wall of the first sliding groove, and the other end of the locking rod is inserted into the locking groove. An elastic sheet is provided in the first plate. The elastic sheet acts on the locking rod and moves the top end of the locking rod to press against the inner wall of the first sliding groove. When the first plate moves into the clearance groove and rotates, the elastic sheet drives the locking rod to move and causes the end of the locking rod to slide out of the locking groove.

[0021] By adopting the above technical solution, when the first plate moves in the first slide groove, the end of the locking rod abuts against the inner wall of the first slide groove, so that the other end of the locking rod can lock the second plate through the locking groove. When the first plate moves into the clearance groove and rotates, the end of the locking rod separates from the inner wall of the first slide groove. At this time, the elastic plate acts on the locking rod and causes the end of the locking rod to move out of the locking groove, thereby unlocking the second plate.

[0022] Preferably, the second plate has reset grooves inclined on both sides of the lock groove, and the two reset grooves are inclined in opposite directions.

[0023] By adopting the above technical solution, when the catheter body stops suction and the elastic metal wire moves the flow-blocking membrane back to the receiving ring groove, the elastic metal wire drives the first plate to move and reset through the guide block and the pull rope. When the first plate moves from the clearance groove to the first slide groove, it rotates, so that the end wall of the first plate re-fits the inner wall of the first slide groove. At this time, the locking rod is pushed into the first plate by the inner wall of the first slide groove. The end of the locking rod away from the first slide groove drives the second plate to rotate and reset through two inclined reset grooves. After the second plate rotates and resets, the end of the locking rod is reinserted into the locking groove and locks the second plate again.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. By utilizing the flow-blocking mechanism and the driving mechanism, when aspirating a thrombus, blood flow is drawn into the catheter body. The blood flow drives the flow-blocking mechanism to unfold through the driving mechanism. The unfolded flow-blocking mechanism blocks the blood flow in the annular gap between the outer wall of the catheter body and the inner wall of the blood vessel, thereby increasing the suction force of the catheter body on the thrombus and thus increasing the thrombus aspiration and capture effect. 2. With the help of the flow-blocking mechanism, when blood is drawn into the catheter body, the blood flow drives the drive mechanism to move. The drive mechanism drives the moving end of the elastic metal wire to move closer to the fixed end. The middle part of the elastic metal wire bends and arches, and drives the flow-blocking membrane to move out of the receiving ring groove. At this time, the tilted and unfolded flow-blocking membrane can block the blood flow in the annular gap between the outer wall of the catheter body and the inner wall of the blood vessel. When the catheter body stops aspiration, the elastic metal wire drives the flow-blocking membrane to return to the receiving ring groove. 3. When blood pushes the push plate to move via the rotating shaft and the second groove, the end wall of the push plate abuts against the inner wall of the first groove, keeping the push plate in the diameter direction of the catheter body, which facilitates the movement of the push plate by blood. When the push plate moves the moving end of the elastic metal wire, the push plate moves to the clearance groove. At this time, the end wall of the push plate disengages from the inner wall of the first groove. Under the action of the rotating shaft, the blood pushes the push plate to rotate in the direction of blood flow. The rounded corner of the push plate rotates and abuts against the inner wall of the clearance groove, keeping the push plate in an inclined state, reducing the resistance of the push plate to blood flow, and facilitating the aspiration of thrombi by the catheter body. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the unidirectional valve aspiration catheter of this application; Figure 2 This is a cross-sectional view of the unidirectional valve aspiration catheter of this application; Figure 3 This is a partial structural cross-sectional view of the unidirectional valve aspiration catheter of this application; Figure 4 This is a partial structural cross-sectional view of the one-way valve aspiration catheter of this application, to highlight the state after the push plate is rotated; Figure 5 This is a partially exploded cross-sectional view of the unidirectional valve aspiration catheter of this application; Figure 6 This is a partial structural cross-sectional view of the one-way valve aspiration catheter of this application, to highlight the locking groove; Figure 7 This is a front view of the unidirectional valve-type aspiration catheter of this application, highlighting the deployed state of the flow-blocking mechanism.

[0026] Reference numerals: 1. Conduit body; 2. Receiving annular groove; 3. Flow-blocking mechanism; 31. Flow-blocking membrane; 32. Elastic metal wire; 4. Drive mechanism; 41. Push plate; 411. First plate; 412. Second plate; 42. Pull rope; 5. Guide frame; 6. Guide block; 7. First slide groove; 8. Connecting hole; 10. Second slide groove; 11. Rotating shaft; 12. Rounded corner; 13. Clearance groove; 14. Locking rod; 15. Locking groove; 16. Elastic sheet; 17. Reset groove. Detailed Implementation

[0027] The following is in conjunction with the appendix Figures 1-7This application will be described in further detail.

[0028] This application discloses a one-way valve-type aspiration catheter.

[0029] Reference Figure 1 A one-way valve-type aspiration catheter includes a catheter plate. A receiving annular groove 2 is formed circumferentially on the outer wall of the catheter body 1 near its opening end. A flow-blocking mechanism 3 is installed within the receiving annular groove 2 on the catheter body 1. When the flow-blocking mechanism 3 is in the retracted state, it is located within the receiving annular groove 2. When the flow-blocking mechanism 3 is in the deployed state, it extends out of the receiving annular groove 2 and blocks blood flow within the annular gap between the outer wall of the catheter body 1 and the inner wall of the blood vessel.

[0030] The flow-blocking mechanism 3 includes a flow-blocking membrane 31 and six elastic metal wires 32. The six elastic metal wires 32 are installed at equal intervals along the circumference of the catheter body 1 within the receiving annular groove 2, and each elastic metal wire 32 is installed along the axial direction of the catheter body 1. The end of the elastic metal wire 32 near the opening of the catheter body 1 is a fixed end, which is fixedly inserted into the side wall of the catheter body 1 located in the receiving annular groove 2.

[0031] Reference Figure 1 , Figure 2 and Figure 3 The other end of the elastic metal wire 32 is a movable end. When the catheter body 1 is fixedly installed within the receiving annular groove 2 near the movable end of the metal wire, a guide frame 5 is provided. Six guide frames 5 are fixedly installed at equal intervals along the circumference of the catheter body 1, and each of the six guide frames 5 corresponds one-to-one with a single elastic metal wire 32. A guide block 6 is slidably installed within each guide frame 5 along the axial direction of the catheter body 1. The movable ends of the six elastic metal wires 32 slide through the six guide frames 5 and are fixedly connected to the six guide blocks 6 respectively. The flow-blocking membrane 31 is located within the receiving annular groove 2 and is fixedly connected to the side of the six elastic metal wires 32 near the opening end of the catheter body 1.

[0032] When the guide block 6 moves toward the opening end of the catheter body 1, the guide block 6 drives the moving end of the elastic metal wire 32 to move, and the middle part of the elastic metal wire 32 arches away from the catheter body 1. At this time, the six elastic metal wires 32 drive the flow-blocking membrane 31 to unfold into a cone shape (see reference). Figure 7 The opening of the choke membrane 31 faces the direction of blood flow. The outer side of the choke membrane 31 is located near the inner wall of the blood vessel, and the inner side of the choke membrane 31 is located near the outer wall of the catheter body 1, so that the blood flow in the annular gap between the outer wall of the catheter body 1 and the inner wall of the blood vessel is blocked within the choke membrane 31.

[0033] Reference Figure 2 , Figure 3 and Figure 4The catheter body 1 is equipped with a drive mechanism 4, which includes six push plates 41 and a pull rope 42. The catheter body 1 is provided with six first sliding grooves 7 at equal intervals along its circumference. Each first sliding groove 7 is opened along the axial direction of the catheter body 1, and the six first plates 411 are slidably installed in the six first sliding grooves 7 respectively.

[0034] The catheter body 1 has six connecting holes 8 inside, and the two ends of each connecting hole 8 are respectively connected to the inner cavity of the first sliding groove 7 and the guide frame 5. Six pull ropes 42 are located in the six connecting holes 8, and the two ends of each pull rope 42 are fixedly connected to the push plate 41 and the guide block 6 respectively.

[0035] During aspiration in the catheter body 1, the blood flow introduced into the lumen generates hydrodynamic force, which acts as the initial driving force on the push plate 41, causing the push plate 41 to undergo axial displacement along the first sliding groove 7. This displacement is transmitted through the pull rope 42 connected to the push plate 41. The pull rope 42 passes through the connecting hole 8, and the traction guide block 6 moves linearly under the constraint of the guide frame 5. The movement of the guide block 6 is further converted into direct traction on the moving end of the elastic metal wire 32, thereby realizing the deployment of the flow-blocking membrane 31. When the catheter body 1 stops aspiration, the bent elastic metal wire 32 releases its elastic potential energy and pushes the guide block 6 to move and reset. The guide block 6 then drives the push plate 41 to move and reset through the pull rope 42. After the elastic metal wire 32 releases its elastic potential energy, it drives the flow-blocking membrane 31 to retract into the receiving ring groove 2, thereby facilitating the re-deployment of the flow-blocking membrane 31.

[0036] Reference Figure 3 , Figure 4 and Figure 5 The push plate 41 includes a first plate 411 and a second plate 412. The second plate 412 is rotatably mounted on the end of the first plate 411, and the width of the second plate 412 is greater than the width of the first plate 411. The end of the first plate 411 away from the second plate 412 slides in the first groove 7, and the end wall of the first plate 411 away from the second plate 412 abuts against the inner wall of the first groove 7. The end of the pull rope 42 is fixedly connected to the first plate 411. A rotating shaft 11 is fixedly mounted on the end of the first plate 411 away from the second plate 412. The guide tube body 1 has two second grooves 10 on its own axis on the two opposite inner side walls of the first groove 7. The two ends of the rotating shaft 11 are respectively slidably mounted in the two second grooves 10.

[0037] Each conduit body 1 has a relief groove 13 on the inner wall of the end of each first groove 7 away from the opening of the conduit body 1. The depth of the relief groove 13 is greater than the depth of the first groove 7, and the relief groove 13 is connected to the inner wall of the first groove 7 by a gradually inclined surface. The first plate 411 abuts against the end wall of the first groove 7 and has a rounded corner 12 on the side away from the opening of the conduit body 1.

[0038] When the catheter body 1 performs aspiration, hemodynamics drives the push plate 41 to move axially along the first groove 7. Initially, the end face of the first plate 411 maintains surface contact with the inner wall of the first groove 7, forming a radial constraint to ensure stable radial movement of the push plate 41 along the catheter body 1, efficiently absorbing fluid thrust (see reference). Figure 3 ).

[0039] When the first plate 411 pulls the elastic metal wire 32 to complete the preset displacement and reaches the clearance groove 13 area, the end face of the first plate 411 disengages from the inner wall of the first sliding groove 7. At this time, under the hinge action of the rotating shaft 11, the blood flow continues to push the push plate 41, causing the push plate 41 to deflect around the rotating shaft 11 in the direction of blood flow (refer to...). Figure 4 The rounded corner 12 of the push plate 41 then forms a line contact support with the inner wall of the clearance groove 13, keeping the push plate 41 at a specific tilt angle. This tilting posture significantly reduces the projected area and flow resistance of the push plate 41 in the flow channel, thereby optimizing the flow field and improving the catheter's efficiency in aspirating thrombi.

[0040] Reference Figure 5 and Figure 6 A locking rod 14 is slidably installed inside the first plate 411 along its own length direction. A locking groove 15 is provided at the end of the second plate 412 near the first plate 411. A reset groove 17 is provided on both sides of the second plate 412 near the end of the first plate 411 and located on both sides of the locking groove 15. The reset grooves 17 are opened at an angle, and the two reset grooves 17 are inclined in opposite directions.

[0041] When the end wall of the first plate 411 abuts against the inner wall of the first slide groove 7, the top of the locking rod 14 abuts against the inner wall of the first slide groove 7 at the same time, and the bottom end of the locking rod 14 is inserted into the locking groove 15, thereby locking the second plate 412 and preventing the second plate 412 from moving.

[0042] Two elastic plates 16 are installed inside the first plate 411. One end of the two elastic plates 16 is fixedly connected to the first plate 411, and the other end is fixedly connected to the locking rod 14. The elastic force of the two elastic plates 16 acts on the locking rod 14, so that the locking rod 14 has a tendency to move away from the second plate 412.

[0043] When the catheter body 1 performs aspiration, the first plate 411 of the push plate 41 moves along the first groove 7 driven by blood flow, and drives the second plate 412 to move synchronously. At this time, the end of the locking rod 14 abuts against the inner wall of the first groove 7, so that the locking end of its other end is embedded in the locking groove 15 of the second plate 412, forming a rigid constraint, thereby preventing the second plate 412 from rotating (see reference). Figure 3 This locked state ensures that the push plate 41 receives the fluid power with the maximum projected area, optimizing transmission efficiency.

[0044] When the push plate 41 assembly moves to the clearance groove 13 area, the first plate 411 begins to deflect under the action of the rotating shaft 11. Simultaneously, the end of the locking rod 14 disengages from the inner wall of the first sliding groove 7, and under the restoring force of the elastic sheet 16, the locking end of the locking rod 14 exits from the locking groove 15, releasing the rotational constraint on the second plate 412. Subsequently, under the action of blood flow, the second plate 412 can freely rotate to an orientation parallel to the blood flow direction (see reference). Figure 4 This significantly reduces flow resistance. This design enables the pusher plate 41 to automatically switch between two working modes: "high-efficiency transmission" and "low-resistance passage," ultimately improving the overall efficiency of thrombus aspiration.

[0045] When the catheter body 1 stops suction, the elastic metal wire 32, under its own restoring force, pulls the first plate 411 to move in the opposite direction along the original path through the transmission of the guide block 6 and the pull rope 42. When the first plate 411 moves back from the avoidance groove 13 area to the first slide groove 7, its end wall rotates under the guidance of the inner wall of the slide groove, restoring to the initial radial posture of being in contact with the inner wall of the first slide groove 7.

[0046] Simultaneously, the inner wall of the first slide groove 7 pushes the locking rod 14 into the first plate 411. The locking end of the locking rod 14 moves into the two reset grooves 17. Guided by the inclined reset grooves 17, it drives the second plate 412 to rotate back to its initial position. After the second plate 412 is fully reset, the locking end of the locking rod 14 is reinserted into the locking groove 15 of the second plate 412, completing the rigid locking of the second plate 412 and restoring the entire push plate 41 to its ready-to-work state.

[0047] The implementation principle of a one-way valve-type aspiration catheter according to an embodiment of this application is as follows: When the catheter body 1 initiates aspiration, the blood flow introduced into the lumen forms a hydrodynamic force, driving the push plate 41 to generate axial displacement along the first sliding groove 7. The movement of the push plate 41 is transmitted through the pull rope 42 connected to it. The pull rope 42 passes through the connecting hole 8 and pulls the guide block 6 to move linearly within the guide frame 5, thereby driving the movable end of the elastic metal wire 32 to move towards the fixed end. As the movable end of the elastic metal wire 32 is displaced, its middle part undergoes directional bending and arches outward under constraint, pushing the flow-blocking membrane 31 out of the receiving annular groove 2 and unfolding outward into an inclined shape. The unfolded flow-blocking membrane 31 can effectively shield the annular gap between the outer wall of the catheter and the inner wall of the blood vessel, thereby blocking the blood flow bypass in this area and ensuring that the suction force is concentrated on the target thrombus.

[0048] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A one-way valve-type aspiration catheter, characterized in that: The catheter includes a catheter body (1), and a flow-blocking mechanism (3) is provided on the outer wall of the catheter body (1) near its own opening end. A driving mechanism (4) is provided inside the catheter body (1). When the catheter body (1) performs aspiration, the blood flow pushes the driving mechanism (4) to move. The driving mechanism (4) drives the flow-blocking mechanism (3) to unfold. The flow-blocking mechanism (3) blocks the blood flow in the annular gap between the outer wall of the catheter body (1) and the inner wall of the blood vessel. When the catheter body (1) stops aspiration, the flow-blocking mechanism (3) retracts into the outer wall of the catheter body (1).

2. The one-way valve-type aspiration catheter according to claim 1, characterized in that: The flow-blocking mechanism (3) includes a flow-blocking membrane (31) and at least three elastic metal wires (32). A receiving annular groove (2) is provided on the outer side wall of the conduit body (1) along its circumference. The flow-blocking membrane (31) is located in the receiving annular groove (2). The elastic metal wires (32) are arranged in the receiving annular groove (2) along the axial direction of the conduit body (1). The multiple elastic metal wires (32) are arranged at equal intervals along the circumference of the conduit body (1). The flow-blocking membrane (31) is fixedly connected to the multiple elastic metal wires (32) and is located on the side of the elastic metal wires (32) near the opening end of the conduit body (1). The end of the elastic metal wire (32) near the opening end of the conduit body (1) is a fixed end and is fixedly connected to the conduit body (1). The end away from the opening end of the conduit body (1) is a movable end and is connected to the driving mechanism (4) for transmission.

3. The one-way valve-type aspiration catheter according to claim 2, characterized in that: The catheter body (1) is provided with multiple guide frames (5) at equal intervals along its circumference on the side of the receiving annular groove (2) away from the fixed end of the elastic metal wire (32). Each guide frame (5) has a guide block (6) slidably installed in it along the axial direction of the catheter body (1). The moving ends of the multiple elastic metal wires (32) pass through the guide frame (5) and are fixedly connected to the guide block (6). The guide block (6) is connected to the driving mechanism (4) for transmission.

4. A one-way valve-type aspiration catheter according to claim 3, characterized in that: The driving mechanism (4) includes multiple push plates (41) and pull ropes (42). A first groove (7) is provided on the inner wall of the catheter body (1) along its own axis. The outer end of the push plate (41) is slidably disposed in the first groove (7). A connecting hole (8) is provided in the catheter body (1). The two ends of the connecting hole (8) are respectively connected to the inner cavity of the guide frame (5) and the first groove (7). The pull rope (42) is located in the connecting hole (8), and the two ends of the pull rope (42) are respectively fixedly connected to the guide block (6) and the push plate (41).

5. A one-way valve-type aspiration catheter according to claim 4, characterized in that: The catheter body (1) has a second groove (10) on the inner side wall of the first groove (7), and the end of the push plate (41) is fixedly provided with a rotating shaft (11), which is slidably disposed in the second groove (10).

6. A one-way valve-type aspiration catheter according to claim 5, characterized in that: The rotating shaft (11) is rotatably disposed in the second slide groove (10). The outer end of the push plate (41) is formed with a rounded corner (12) on the side away from the opening end of the conduit body (1). The conduit body (1) is provided with a relief groove (13) on the side of the inner wall of the first slide groove (7) away from the opening end of the conduit body (1). The push plate (41) is disposed along the diameter direction of the conduit body (1). The outer end wall of the push plate (41) moves to abut against the inner wall of the first slide groove (7). The rounded corner (12) of the push plate (41) rotates to abut against the inner wall of the relief groove (13).

7. A one-way valve-type aspiration catheter according to claim 6, characterized in that: The push plate (41) includes a first plate (411) and a second plate (412). The width of the second plate (412) is greater than the width of the first plate (411). The rotating shaft (11) and the rounded corner (12) are both provided on the first plate (411). The first plate (411) is slidably disposed in the first slide groove (7). The second plate (412) is rotatably disposed at the end of the first plate (411) away from the first slide groove (7). The first plate (411) is provided with a locking rod (14) for locking the second plate (412). When the outer end wall of the push plate (41) abuts against the inner wall of the first slide groove (7), the locking rod (14) is inserted into the second plate (412) and locks the second plate (412). When the push plate (41) moves into the clearance groove (13) and rotates, the locking rod (14) releases the lock on the second plate (412).

8. A one-way valve-type aspiration catheter according to claim 7, characterized in that: The second plate (412) has a locking groove (15). When the end wall of the first plate (411) abuts against the inner wall of the first sliding groove (7), one end of the locking rod (14) abuts against the inner wall of the first sliding groove (7), and the other end of the locking rod (14) is inserted into the locking groove (15). The first plate (411) is provided with an elastic piece (16). The elastic piece (16) acts on the locking rod (14) and causes the top end of the locking rod (14) to move and press against the inner wall of the first sliding groove (7). When the first plate (411) moves into the clearance groove (13) and rotates, the elastic piece (16) drives the locking rod (14) to move and causes the end of the locking rod (14) to slide out of the locking groove (15).

9. A one-way valve-type aspiration catheter according to claim 8, characterized in that: The second plate (412) is provided with reset grooves (17) on both sides of the lock groove (15) at an inclination, and the two reset grooves (17) are in opposite directions.

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