Tension-resistant traction suction catheter of pulse negative pressure source and driving equipment

Abstract

The invention belongs to the technical field of medical instruments, particularly relates to an anti-tension traction suction catheter of a pulse negative pressure source and driving equipment, and solves the problems that a traditional suction catheter is insufficient in performance, the negative pressure source is difficult to form effective pulse negative pressure, and negative pressure peak value control is lacked. The reinforcing pipe layer is composed of metal wires which are reversely wound in a double-helix mode, the supporting pipe layer is composed of metal rings arranged at intervals and transverse metal wires connected with the metal rings and is used for improving the flexibility and tensile strength of the catheter, a pulse mechanism composed of a sealing disc and a linkage mechanism is arranged in the driving equipment, and a connecting pipeline is automatically opened when negative pressure reaches the peak value; intermittent pulse negative pressure output is formed, a protection mechanism is further arranged, when the negative pressure exceeds a set threshold value, the pressure is automatically reduced, the catheter is matched with driving equipment, pulse negative pressure can be formed in the suction process, thrombus loosening is promoted, meanwhile, the catheter structure can adapt to blood vessel bending, and collapse is avoided.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a tension traction aspiration catheter and driving device with a pulse negative pressure source. Background Technology

[0002] In the field of interventional vascular therapy, thrombectomy is a key technique for treating thromboembolic diseases such as acute ischemic stroke and acute myocardial infarction. This technique uses a catheter to remove the thrombus from the blood vessel, restoring vascular patency and preventing tissue ischemia and necrosis caused by thrombus blockage. However, existing thrombectomy catheters often face several technical bottlenecks in clinical application: 1. When dealing with stubborn or long thrombi, constant continuous negative pressure often only attracts the surface of the thrombus and is difficult to break the adhesion between the thrombus and the vessel wall. In addition, when forcefully dragging the thrombus to remove it, traditional large-diameter catheters are prone to axial tensile deformation (elongation), which leads to catheter diameter collapse, reduced negative pressure transmission efficiency, and even loss of effective gripping force on the thrombus during the retraction process. 2. Most existing negative pressure driven devices adopt a continuous negative pressure output method. Under continuous negative pressure, thrombi tend to adhere tightly to the blood vessel wall and are difficult to loosen and detach, resulting in a reduced aspiration success rate. Although some devices attempt to achieve pulsed negative pressure output, there are problems such as inaccurate pulse frequency adjustment and difficulty in controlling the negative pressure peak. When the negative pressure peak is too high, it may cause excessive traction on the blood vessel wall and cause vascular damage. When the negative pressure peak is too low, it cannot generate sufficient suction force and cannot effectively remove thrombi. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing traditional suction catheters, such as insufficient performance, difficulty in generating effective pulsed negative pressure, and lack of negative pressure peak control. Therefore, this invention proposes a tension-resistant suction catheter and driving device with a pulsed negative pressure source.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A tension traction aspiration catheter with a pulse negative pressure source includes a catheter, one end of which is funnel-shaped for drawing thrombus into the catheter through the funnel opening. The catheter includes an inner liner, a reinforcing liner, a supporting liner, and an outer liner, which are arranged sequentially from the inside to the outside. The reinforcing tube layer is composed of a spiral metal mesh, and the spiral metal mesh is made of multiple metal wires wound in a double helix reverse winding manner on the outer wall of the inner lining tube layer, which is used to improve the flexibility, flexural strength and fatigue resistance of the conduit. The support tube layer consists of multiple metal rings and transverse metal wires. The multiple metal rings are all sleeved on the outer wall of the spiral metal mesh, and adjacent metal rings are fixedly connected by multiple transverse metal wires. This not only improves the tensile strength of the catheter, but also prevents the inner lumen of the catheter from collapsing.

[0005] In one possible design, the inner liner is made of polytetrafluoroethylene, the outer tube is made of polyurethane, and the spiral metal mesh, metal rings, and transverse metal wires are made of metal wires with superelasticity and shape memory properties, such as nickel-titanium alloy wires.

[0006] A pulse negative pressure source driving device is used to provide a negative pressure source for the anti-tension traction suction conduit of the pulse negative pressure source mentioned above. It includes a housing, a negative pressure box is installed on the bottom inner wall of the housing, and a piston plate I is sealed and slidably connected inside the negative pressure box. A negative pressure drive mechanism is installed inside the housing and connected to the piston plate I, used to drive the piston plate I to reciprocate to generate negative pressure in the negative pressure box; Connecting pipe I, one end of which is connected to the side of the negative pressure box away from the piston plate I, and the other end extends to one side of the outer shell; It also includes a pulse mechanism, which is disposed inside the negative pressure box and corresponds to the port of the connecting pipe I. The pulse mechanism includes a rotating shaft and a sealing disk installed on the outer wall of the rotating shaft. The sealing disk is used to seal the port of the connecting pipe I.

[0007] In one possible design, a collection box is also provided on one side of the housing, with the end of the connecting tube I away from the housing extending into the collection box, the top of the collection box being connected to a connecting tube II for connecting the catheter, a filter screen being installed inside the collection box, and a return tube being connected to the bottom of the collection box.

[0008] In one possible design, the negative pressure drive mechanism includes a permanent magnet synchronous motor, a rotating disk, a pin, a moving frame, and a pull rod. The permanent magnet synchronous motor is mounted on the bottom inner wall of the housing. The rotating disk is rotatably connected inside the housing and connected to the output shaft of the permanent magnet synchronous motor. The pin is fixed at an eccentric position on the rotating disk. The moving frame is fixedly connected to one end of the pull rod, and the other end of the pull rod is fixedly connected to the piston plate I. A strip groove is provided on the moving frame, and the pin extends into the strip groove and slides and hinges with the strip groove.

[0009] In one possible design, the pulse mechanism further includes a rotating arm, a spur gear, a lifting plate, a spring, a sliding rod, a rack, trapezoidal block I, and trapezoidal block II; The rotating arm is fixedly sleeved on the outer wall of the rotating shaft and fixedly connected to the closed disc. The spur gear is fixed to the end of the rotating shaft. The lifting plate is slidably arranged above the negative pressure box through multiple vertical rods. Multiple springs are connected between the top of the lifting plate and the top inner wall of the protective box I. The sliding rod is fixed to the bottom of the lifting plate and extends into the negative pressure box in a sealed sliding manner. The rack is fixed to one side of the sliding rod and meshes with the spur gear. The trapezoidal block I is fixed to the side of the piston plate I near the pull rod. The trapezoidal block II is fixed to the bottom of the lifting plate and extends into the negative pressure box in a sealed sliding manner, and cooperates with the trapezoidal block I. The pulse mechanism also includes a limiting plate fixed to the inner wall of the negative pressure box, which is used to stop the closed disc when the spring drives it to reset.

[0010] In one possible design, a protective mechanism is also included, comprising a buffer cylinder fixedly connected to the connecting pipe I, a piston plate II slidably connected to the buffer cylinder, a magnet fixed to the inner wall of the top of the buffer cylinder, an electromagnet fixed to the top of the piston plate II, and a tension spring connected between the top of the piston plate II and the inner wall of the top of the buffer cylinder.

[0011] In one possible design, a pressure sensor is also included, which is disposed on the outer wall of the connecting pipe I, for detecting the negative pressure peak value inside the connecting pipe I and controlling the on / off state of the electromagnet.

[0012] In one possible design, a protective box II is also included, which is fixed to the inner wall of the negative pressure box. The end of the rotating shaft and the bottom of the sliding rod are both sealed and extended into the protective box II. The spur gear and the rack are located inside the protective box II.

[0013] In one possible design, an expansion box fixed inside the outer casing is also included. The bottom of the expansion box is connected to the top of the negative pressure box through multiple second connecting pipes. A piston plate III is slidably connected inside the expansion box, and a threaded rod is rotatably connected to the top of the piston plate III. The top end of the threaded rod is threaded to the top of the expansion box.

[0014] Beneficial effects: In this invention, the catheter adopts a four-layer structure design from the inside out, consisting of an inner liner layer, a reinforcing layer, a supporting layer, and an outer layer. Each layer works synergistically to improve the overall performance of the catheter. The inner liner layer is made of polytetrafluoroethylene, which has excellent lubricity, reducing the adhesion of thrombi to the inner wall of the catheter and reducing the frictional resistance when the catheter is advanced in the blood vessel, facilitating the smooth advancement of the catheter. The outer layer is made of polyurethane, which has good flexibility and biocompatibility, reducing the stimulation and damage of the catheter to the blood vessel wall and improving the safety of the operation. In this invention, the reinforcing tube layer is composed of a double-helix reverse-wound spiral metal mesh. Compared with the traditional single-layer spiral winding structure, the double-helix reverse winding method makes the metal mesh more uniformly stressed, which can significantly improve the flexibility of the catheter, allowing the catheter to better adapt to the curvature of the blood vessel and smoothly pass through complex vascular paths. At the same time, the spiral metal mesh enhances the catheter's resistance to bending and fatigue, preventing the catheter from breaking during repeated bending and advancement, and extending the service life of the catheter. In this invention, the support tube layer is composed of multiple metal rings and transverse metal wires. The metal rings are evenly sleeved on the outer wall of the spiral metal mesh, and adjacent metal rings are fixedly connected by transverse metal wires to form a stable frame structure. This structure can effectively improve the tensile strength of the catheter, resist tensile forces during catheter traction, and prevent the catheter from being stretched and deformed. At the same time, the frame structure of the support tube layer can support the inner lumen of the catheter, preventing the inner lumen of the catheter from collapsing due to negative pressure or external compression, ensuring the smooth transmission of negative pressure and the unobstructed thrombus aspiration channel, and ensuring the smooth progress of the aspiration process. In this invention, the pulse mechanism achieves precise start and stop control of the closed disc through the cooperation of trapezoidal block I and trapezoidal block II and the meshing transmission of rack and spur gear. The closed disc will only open and release the pulse negative pressure when the piston plate I moves to the end of its stroke and the negative pressure in the negative pressure box reaches its maximum peak value. This design allows the negative pressure to be released in a concentrated manner, forming a high-intensity pulse negative pressure, which promotes the microscopic loosening, fragmentation and "fluidization" of the thrombus, effectively detaching it from the blood vessel wall and improving the success rate of thrombus aspiration. Compared with the continuous negative pressure output method, pulse negative pressure can prevent the thrombus from sticking tightly to the blood vessel wall, further improving the aspiration effect. In this invention, the air pressure sensor detects the negative pressure peak value in the connecting tube I in real time. When the negative pressure peak value is too high, the control center promptly controls the electromagnet to be de-energized, and the piston plate II moves under the action of negative pressure to reduce the negative pressure value in the connecting tube I, thus avoiding traction damage to the blood vessel wall caused by excessive negative pressure. The tension spring ensures that the piston plate II can be reset in time, so that the protection mechanism can continue to play its role. This automatic protection mechanism is responsive, reliable, and reduces surgical risks. In this invention, the expansion box enables manual adjustment of the negative pressure peak value. The operator can adjust the position of the piston plate III by rotating the handwheel, thereby changing the overall space of the negative pressure box and adjusting the negative pressure peak value. This design increases the applicability of the equipment, enabling precise adjustment of negative pressure parameters according to the vascular condition and thrombosis characteristics of different patients, thus improving the personalized treatment effect of the surgery. The fluoroscopic window facilitates the operator's observation of the position of the piston plate III, ensuring the accuracy of the adjustment.

[0015] In this invention, the four-layer structure design of the catheter synergistically enhances its flexibility, flexural strength, fatigue resistance, and tensile strength, preventing bending, breakage, or internal collapse during advancement and traction. This ensures the catheter can smoothly reach the lesion site and maintain a clear aspiration channel. The drive device, driven by a motor, achieves stable generation and precise frequency adjustment of pulsed negative pressure. The pulse mechanism concentrates the release of negative pressure to form a high-intensity pulse, effectively promoting thrombus loosening and detachment, thus improving the aspiration success rate. The cooperation between the protection mechanism and the expansion box enables automatic protection and manual adjustment of the negative pressure peak, adapting to different surgical scenarios and reducing surgical risks. The design of the collection box and filter enables thrombus collection and blood return, reducing blood loss and ensuring the smooth progress of the surgery. Attached Figure Description

[0016] Figure 1 A three-dimensional structural schematic diagram of an anti-tension traction suction catheter for a pulse negative pressure source provided by the present invention; Figure 2 This is a cross-sectional schematic diagram of the anti-tension traction suction catheter of a pulse negative pressure source provided by the present invention. Figure 3 A three-dimensional structural schematic diagram of the spiral metal mesh of the anti-tension traction suction catheter of a pulse negative pressure source provided by the present invention; Figure 4 A three-dimensional structural schematic diagram of a pulse negative pressure source driving device provided by the present invention; Figure 5 A three-dimensional cross-sectional view of the housing of a pulse negative pressure source driving device provided by the present invention; Figure 6 This is a three-dimensional exploded structural diagram of the negative pressure box, expansion box and moving frame of a pulse negative pressure source driving device provided by the present invention. Figure 7 This is a three-dimensional cross-sectional view of the negative pressure box and expansion box of a pulse negative pressure source driving device provided by the present invention. Figure 8 A three-dimensional exploded view of the enclosed disc and lifting plate of a pulse negative pressure source driving device provided by the present invention; Figure 9 A three-dimensional exploded view of the moving frame and rotating disk of a pulse negative pressure source driving device provided by the present invention; Figure 10 A three-dimensional cross-sectional view of the collection box of a pulse negative pressure source driving device provided by the present invention; Figure 11 A three-dimensional exploded cross-sectional view of the buffer cylinder, piston plate II, and magnet block of a pulse negative pressure source driving device provided by the present invention. Figure 12This is a three-dimensional cross-sectional view of the expansion box of a pulse negative pressure source driving device provided by the present invention. Figure 13 This is a three-dimensional structural diagram of the metal ring and transverse metal wire of the anti-tension traction suction catheter of a pulse negative pressure source provided by the present invention.

[0017] In the diagram: 1. Conduit; 2. Inner liner; 3. Reinforcing liner; 4. Supporting liner; 5. Outer liner; 6. Spiral metal mesh; 7. Metal ring; 8. Horizontal metal wire; 9. Outer shell; 10. Negative pressure box; 11. Piston plate I; 12. First connecting pipe; 13. Pull rod; 14. Moving frame; 15. Strip groove; 16. Permanent magnet synchronous motor; 17. Rotating disk; 18. Pin; 19. Trapezoidal block I; 20. Protective box I; 21. Vertical rod; 22. Lifting plate; 23. Spring; 24. Trapezoidal block II; 2 5. Sliding rod; 26. Rack; 27. Rotating shaft; 28. Rotating arm; 29. ​​Enclosed disc; 30. Limiting plate; 31. Spur gear; 32. Protective box II; 33. Connecting pipe I; 34. Pressure sensor; 35. Collection box; 36. Filter screen; 37. Return tube; 38. Connecting pipe II; 39. Buffer cylinder; 40. Piston plate II; 41. Magnet block; 42. Electromagnet; 43. Tension spring; 44. Expansion box; 45. Second connecting pipe; 46. Piston plate III; 47. Threaded rod; 48. Viewing window. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Reference Figure 1 and Figure 2 In one embodiment: a pulse negative pressure source anti-tension traction aspiration catheter and driving device, relating to the field of medical device technology, mainly includes a catheter 1, which is responsible for entering the blood vessel and performing aspiration. The catheter 1 is a tubular device with a multi-layer composite structure. One end of the catheter 1 is shaped into a trumpet shape. This trumpet-shaped opening helps to expand the adsorption area during aspiration and guide the thrombus to enter the inner lumen of the catheter 1 more smoothly. The wall of the catheter 1 consists of four layers from the inside to the outside. The innermost layer is the inner liner layer 2, which directly constitutes the working inner lumen of the catheter 1. Its inner wall needs to be smooth to reduce blood flow resistance and prevent thrombus adhesion.

[0020] Furthermore, referring to Figure 2 The inner lining layer 2 is made of polytetrafluoroethylene (PTFE), which has an extremely low coefficient of surface friction and good biocompatibility.

[0021] Furthermore, referring to Figure 2 , Figure 3 and Figure 13 Closely attached to the outer wall of the inner liner layer 2 is the reinforcing liner layer 3, which is composed of a spiral metal mesh 6. This spiral metal mesh 6 is woven from multiple metal wires, specifically, multiple metal wires are wound around the outer periphery of the inner liner layer 2 in a double helix reverse winding manner. This weaving structure gives the catheter 1 good flexibility, allowing the catheter 1 to conform to the natural curvature of the blood vessel. The double helix reverse winding configuration provides radial support and axial elasticity, enhancing the catheter 1's resistance to bending. After repeated bending, this structure can effectively resist plastic deformation and fracture, thereby improving the fatigue life of the catheter 1. The metal wires constituting the spiral metal mesh 6 are nickel-titanium alloy wires with superelasticity and shape memory properties to ensure that the catheter has the required flexibility and fatigue resistance.

[0022] Furthermore, referring to Figure 2 , Figure 3 and Figure 13 The outer periphery of the reinforcing tube layer 3 is the supporting tube layer 4. The main function of the supporting tube layer 4 is to provide axial tensile strength and prevent the inner lumen of the conduit 1 from collapsing under negative pressure or when bending. The supporting tube layer 4 consists of multiple independent metal rings 7 and transverse metal wires 8 connecting these metal rings 7. Multiple metal rings 7 are spaced at a certain distance along the axial direction of the conduit 1 and are sleeved on the outer wall of the spiral metal mesh 6. Each metal ring 7 is a closed ring structure that provides local radial support to the conduit 1. Adjacent metal rings 7 are fixedly connected by multiple transverse metal wires 8. The transverse metal wires 8 extend along the axial direction of the conduit 1 and connect multiple metal rings 7 in series to form a whole. This structure is similar to a flexible cage skeleton. When the conduit 1 is subjected to axial tensile force, the tensile force is distributed to each metal ring 7 through the transverse metal wires 8, avoiding stress concentration, thereby significantly improving the overall tensile strength of the conduit 1. The metal rings 7 and transverse metal wires 8 can also be made of nickel-titanium alloy wire.

[0023] Furthermore, referring to Figure 2 The outermost layer of the catheter 1 is the outer tube 5, which encloses the inner liner layer 2, the reinforcing tube layer 3, and the supporting tube layer 4. It serves to integrate, shape, and protect the internal structure and provide a smooth outer surface. The material of the outer tube 5 needs to have a certain degree of flexibility and biocompatibility. In one embodiment, the material of the outer tube 5 is polyurethane. Polyurethane has good elasticity, wear resistance, and blood compatibility. Through heat shrinking or coating processes, the outer tube 5 can be tightly wrapped around the internal structure to form a complete and smooth outer wall of the catheter 1.

[0024] Reference Figure 1 , Figure 4 , Figure 5 and Figure 7A pulse negative pressure source driving device is used to provide a negative pressure source for the anti-tension traction suction conduit of the aforementioned pulse negative pressure source, generating controllable, intermittent negative pressure pulses, which are transmitted to the conduit 1 through a pipeline. It mainly includes a housing 9, which provides a mounting base and external protection for the various components of the device. A negative pressure box 10 is fixedly installed on the bottom inner wall of the housing 9. The negative pressure box 10 is a container with a sealed chamber, inside which a piston plate I11 is slidably connected. The edge of the piston plate I11 and the inner wall of the negative pressure box 10 maintain airtight sliding contact through a sealing ring. The movement of the piston plate I11 changes the volume of the chamber of the negative pressure box 10, thereby generating negative or positive pressure. A pull rod 13 is fixedly connected to the center of one side of the piston plate I11. One end of the pull rod 13 passes through the box wall of the negative pressure box 10 and extends to the outside, and a dynamic sealing structure is provided at the point of penetration to prevent air leakage.

[0025] Furthermore, referring to Figure 5 , Figure 6 , Figure 7 and Figure 9 The equipment is equipped with a negative pressure drive mechanism to drive the piston plate I11 to reciprocate linear motion to generate negative pressure. The negative pressure drive mechanism includes a permanent magnet synchronous motor 16 fixedly installed on the inner wall of the bottom of the outer casing 9. The output shaft of the permanent magnet synchronous motor 16 is connected to a rotating disk 17 through a coupling. The rotating disk 17 is driven by the motor to rotate. On one side of the rotating disk 17, a pin 18 is fixed off-center. A movable frame 14 is fixedly connected to one end of the pull rod 13 outside the negative pressure box 10. A strip groove 15 is opened on the movable frame 14. One end of the pin 18 on the rotating disk 17 extends into the strip groove 15 and forms a sliding hinge engagement with the strip groove 15.

[0026] Specifically, when the permanent magnet synchronous motor 16 starts and drives the rotating disk 17 to rotate, the pin 18 moves in a circular motion with the rotating disk 17. Since the pin 18 is stuck in the slot 15 of the moving frame 14, the circular motion of the pin 18 is converted into the reciprocating linear motion of the moving frame 14. The moving frame 14 drives the piston plate I 11 to make synchronous reciprocating linear motion in the negative pressure box 10 through the pull rod 13. By adjusting the speed of the permanent magnet synchronous motor 16, the rotation frequency of the rotating disk 17 can be changed, thereby adjusting the reciprocating motion frequency of the piston plate I 11, that is, the pulse frequency generated by the negative pressure.

[0027] Furthermore, referring to Figure 7On the side wall of the negative pressure box 10 away from the pull rod 13, a connecting pipe I33 is fixedly connected. One end of the connecting pipe I33 passes through the side wall of the outer shell 9 and leads to external equipment. The negative pressure box 10 is equipped with a pulse mechanism. The function of the pulse mechanism is to open the connecting pipe I33 instantaneously when the negative pressure in the negative pressure box 10 reaches the peak value, so that the accumulated negative pressure can be released, thereby forming a negative pressure pulse in the pipeline; then it quickly closes to prepare for the next accumulation of negative pressure.

[0028] Furthermore, referring to Figure 7 and Figure 8 The core components of the pulse mechanism include a rotating shaft 27 and a closed disc 29. The rotating shaft 27 is rotatably supported on the inner wall of the negative pressure box 10 near the connecting pipe I 33 by bearings. The closed disc 29 is fixedly sleeved on the outer periphery of the rotating shaft 27. The position of the closed disc 29 is set so that when it rotates to a specific angle, its disc surface can completely cover and seal the open end of the connecting pipe I 33 in the negative pressure box 10. Sealing gaskets can be set on the edge of the closed disc 29 or on the inner wall of the negative pressure box 10 to ensure airtightness when closed. In order to realize the automatic opening and closing of the closed disc 29, a rotating arm 28 is also fixedly sleeved on the rotating shaft 27. The rotating arm 28 is fixedly connected to the closed disc 29 or integrally formed, so that the swing of the rotating arm 28 can directly drive the closed disc 29 to rotate.

[0029] Furthermore, referring to Figure 7 and Figure 8 One end of the rotating shaft 27 extends into a sealed protective box II 32. Inside the protective box II 32, a spur gear 31 is fixedly installed at the end of the rotating shaft 27. A protective box I 20 is fixedly installed on the top of the negative pressure box 10. The inner wall of the top of the protective box I 20 is connected to the top of the negative pressure box 10 through multiple vertical rods 21. A lifting plate 22 is slidably sleeved on the multiple vertical rods 21. The lifting plate 22 can slide up and down along the vertical rods 21. The top of the lifting plate 22 is connected to the protective box I 20. Between the top inner walls, multiple springs 23 are installed. The springs 23 are sleeved on the outside of the vertical rod 21. Under normal conditions, they apply downward pressure to the lifting plate 22. A sliding rod 25 is fixedly connected to the bottom of the lifting plate 22. The sliding rod 25 passes downward and sealably through the top of the protective box I 20 and the negative pressure box 10, and extends further into the protective box II 32. Inside the protective box II 32, a rack 26 is fixedly installed on one side of the sliding rod 25. The rack 26 meshes with the spur gear 31 on the rotating shaft 27.

[0030] Furthermore, referring to Figure 7 and Figure 8A trapezoidal block II 24 is fixed to the bottom of the lifting plate 22 on the side away from the sliding rod 25. The trapezoidal block II 24 extends downwards in a sealed manner into the cavity of the negative pressure box 10. A trapezoidal block I 19 is fixedly installed on the side of the piston plate I 11 near the pull rod 13. The position of trapezoidal block I 19 corresponds to the position of trapezoidal block II 24. When the piston plate I 11 moves towards the rotating disk 17 to near the end of its stroke, trapezoidal block I 19 will contact the inclined surface of trapezoidal block II 24 and push trapezoidal block II 24 and the entire lifting plate 22 assembly connected to it upwards. The upward movement of the lifting plate 22 compresses the spring 23, and at the same time, it drives the rack 26 to move upward through the sliding rod 25. The upward movement of the rack 26 drives the spur gear 31 that meshes with it to rotate, thereby driving the sealing disc 29 to rotate through the rotating shaft 27 and the rotating arm 28, causing it to leave the opening of the connecting pipe I 33 and release the sealing state. A limiting plate 30 is also fixed on the inner wall of the negative pressure box 10. When the sealing disc 29 rotates in the opposite direction to close under the reset action of the spring 23, the limiting plate 30 plays a mechanical stop role, ensuring that the sealing disc 29 can accurately reset to the position of completely sealing the connecting pipe I 33.

[0031] Furthermore, referring to Figure 1 , Figure 4 and Figure 10 On one side of the outer casing 9, there is a collection box 35. The end of the connecting pipe I 33 away from the negative pressure box 10 is fixedly connected and extends into the interior of the collection box 35. The top of the collection box 35 is fixedly connected to a connecting pipe II 38. The other end of the connecting pipe II 38 is used to connect to the end of the conduit 1 away from the funnel-shaped opening. A filter screen 36 is fixedly installed inside the collection box 35. The filter screen 36 divides the interior of the collection box 35 into upper and lower parts. The outlet of the connecting pipe I 33 is located above the filter screen 36, and the inlet of the connecting pipe II 38 is located above the filter screen 36. The bottom of the collection box 35 is fixedly connected to a return vessel 37. A control valve can be provided on the return vessel 37. One-way valves are installed inside the first connecting pipe 12 and the return vessel 37, which only allow fluid to flow in a specific direction.

[0032] Furthermore, referring to Figure 4 , Figure 10 and Figure 11The device also includes a protection mechanism for monitoring and controlling the negative pressure peak within the connecting tube I 33 to prevent potential damage to the patient's blood vessels due to excessive negative pressure. The protection mechanism includes a buffer cylinder 39 fixedly connected to the connecting tube I 33. A piston plate II 40 is slidably connected inside the buffer cylinder 39. The inner wall of the buffer cylinder 39 has an axial guide groove, and the outer wall of the piston plate II 40 has a guide block adapted to the guide groove. A sealing ring is provided between the edge of the piston plate II 40 and the inner wall of the buffer cylinder 39. A tension spring 43 is connected between the top of the piston plate II 40 and the inner wall of the top of the buffer cylinder 39 via a spring seat. Under normal conditions, the tension spring 43 applies an upward pulling force to the piston plate II 40. A magnet 41 is fixedly installed on the inner wall of the top of the buffer cylinder 39, and an electromagnet 42 is fixedly installed at the corresponding position on the top of the piston plate II 40. When energized, a magnetic attraction force is generated between the electromagnet 42 and the magnet 41. The design value of this magnetic attraction force is greater than the downward attraction force generated by the negative pressure that the connecting pipe I 33 can achieve during normal operation on the piston plate II 40.

[0033] Furthermore, referring to Figure 4 , Figure 10 and Figure 11 It also includes a pressure sensor 34, which is disposed on the outer wall of the connecting pipe I 33 and electrically connected to the controller. It is used to detect the negative pressure peak value in the connecting pipe I 33. When the negative pressure peak value exceeds the set threshold, the controller controls the electromagnet 42 to be de-energized and controls the electromagnet 42 to be re-energized after a preset delay time.

[0034] Furthermore, referring to Figure 7 and Figure 8 A protective box II 32 is fixed on the top inner wall of the negative pressure box 10. One end of the rotating shaft 27 extends into the protective box II 32 in a sealed rotational manner, and the bottom end of the sliding rod 25 extends into the protective box II 32 in a sealed sliding manner. The meshing transmission of the spur gear 31 and the rack 26 is carried out inside the protective box II 32. A first connecting pipe 12 is fixedly inserted through the piston plate I 11. A one-way valve is provided in the first connecting pipe 12, which allows external air to enter the chamber of the piston plate I 11 near the pull rod 13, but prevents air backflow. The sealing plate 29 and the inner wall of the negative pressure box 10 achieve sliding sealing and rotational guidance through the cooperation of the arc-shaped slide rail and the annular slide rail block.

[0035] A controller (not shown in the figure) is also installed on the top of the outer casing 9. The controller is electrically connected to the permanent magnet synchronous motor 16, the air pressure sensor 34 and the electromagnet 42 respectively, and is used to coordinate the work of each component. The controller is used to receive the negative pressure signal collected by the air pressure sensor 34 and control the start, stop or speed of the permanent magnet synchronous motor 16 according to the preset program, as well as control the power on and off of the electromagnet 42.

[0036] In another embodiment: Refer to Figure 6and Figure 12 In addition, the device is equipped with a negative pressure peak adjustment mechanism, which includes an expansion box 44 fixedly penetrating the outer shell 9. The bottom of the expansion box 44 is fixedly connected to the top of the negative pressure box 10 through multiple second connecting pipes 45. The second connecting pipes 45 are located on the side of the piston plate I 11 near the closed disk 29. A piston plate III 46 is slidably connected inside the expansion box 44. Two axial guide rods are symmetrically arranged on the inner wall of the expansion box 44. The piston plate III 46 has a guide hole adapted to the guide rod. The guide rod passes through the guide hole and slides with the piston plate III 46. A threaded rod 47 is rotatably connected to the top of the piston plate III 46 through a bearing. The top end of the threaded rod 47 passes through the top of the expansion box 44 and is screwed out through a threaded engagement. Rotating the threaded rod 47 can drive the piston plate III 46 to rise and fall inside the expansion box 44. A viewing window 48 is embedded in the side wall of the expansion box 44 for observing the position of the piston plate III 46.

[0037] This device requires regular maintenance. 1. After every 50 uses, apply medical-grade grease to the meshing pair of spur gear 31 and rack 26 inside the protective box II 32; 2. After each surgery, disassemble the collection box 35 and replace the filter 36; 3. Check the integrity of each seal monthly, and replace it promptly if it is found to be aged or damaged.

[0038] A method of using a pulse negative pressure source driving device includes the following steps: S1. First, connect and prepare the system. Connect the proximal end of catheter 1 to collection box 35 through connecting tube II 38. Insert the distal end of catheter 1 into the target blood vessel through percutaneous puncture and close to the thrombus site. Connect the return tube 37 to the appropriate blood collection bag and check whether the connections of each tube are sealed. S2. Start the permanent magnet synchronous motor 16. The permanent magnet synchronous motor 16 drives the rotating disk 17 to rotate at a set speed. The pin 18 on the rotating disk 17 then makes a circular motion. The pin 18 slides in the strip groove 15 of the moving frame 14, converting the rotational motion into the reciprocating linear motion of the moving frame 14. The moving frame 14 drives the piston plate I 11 to make a reciprocating motion in the negative pressure box 10 through the pull rod 13. S3. When the piston plate I11 is pulled towards the rotating disk 17 by the pull rod 13, the volume of the chamber on the side of the piston plate I11 near the closed disk 29 increases. At this time, due to the action of the pulse mechanism, the closed disk 29 is in the closed state under the action of the spring 23, sealing the inlet of the connecting pipe I33. Therefore, the pressure in the chamber drops and a negative pressure is formed. This process is the negative pressure accumulation stage. S4. As the piston plate I11 continues to move, the negative pressure value in the negative pressure box 10 continues to rise. When the piston plate I11 moves to near the end of its stroke, the trapezoidal block I19 fixed on the piston plate I11 contacts the inclined surface of the trapezoidal block II24 fixed under the lifting plate 22. Under the continued pushing of the piston plate I11, the trapezoidal block I19 pushes the trapezoidal block II24 upward. The trapezoidal block II24 drives the lifting plate 22 to slide upward along the vertical rod 21 against the elastic force of the spring 23. The movement of the lifting plate 22 is transmitted to the rack 26 in the protective box II32 through the sliding rod 25, causing the rack 26 to move upward. The upward-moving rack 26 drives the gear to mesh with the gear. The spur gear 31 rotates, which drives the rotating arm 28 and the closed disc 29 fixed on the same rotating shaft 27 to rotate. The closed disc 29 rotates away from the opening of the connecting tube I 33, so that the connecting tube I 33 is connected to the negative pressure chamber of the negative pressure box 10. At this time, the peak negative pressure accumulated in the negative pressure box 10 is released through the instantaneously opened connecting tube I 33. The sudden release of the high pressure difference forms a transient, high-intensity negative pressure pulse in the connecting tube I 33 and the subsequent collection box 35, connecting tube II 38 and catheter 1. This pulse is transmitted to the trumpet-shaped opening at the distal end of the catheter 1 and acts on the thrombus and the surrounding blood. S5. The instantaneous negative pressure pulse can generate microscopic mechanical disturbances inside the thrombus and at the adhesion interface between the thrombus and the blood vessel wall. This disturbance helps to loosen the structure of the thrombus, causing it to undergo microscopic fragmentation or reduce its adhesion to the blood vessel wall, exhibiting a "fluidization" tendency. After the pulse ends, the pressure at the opening of catheter 1 recovers rapidly, which helps the loosened thrombus part to be drawn into catheter 1. S6. After the piston plate I11 reaches the end of its stroke, the continued rotation of the rotating disk 17 causes the pin 18 to start pushing the moving frame 14 to move in the opposite direction. The pull rod 13 pushes the piston plate I11 back away from the rotating disk 17. At this time, the pressure of the piston plate I11 on the trapezoidal block II24 is released, the compressed spring 23 releases its elastic force, and pushes the lifting plate 22 to reset downward. The lifting plate 22 drives the rack 26 to move down through the sliding rod 25. The rack 26 moves down and drives the spur gear 31 to rotate in the opposite direction, thereby driving the sealing disk 29 to rotate in the opposite direction, resealing the opening of the connecting pipe I33. The negative pressure chamber of the negative pressure box 10 is sealed again to prepare for the next negative pressure accumulation. The return stroke of the piston plate I11 discharges some of the previously inhaled gas through the one-way valve of the first connecting pipe 12. S7. The negative pressure pulse released from the connecting tube I 33 enters the collection box 35. The negative pressure is transmitted to the catheter 1 through the connecting tube II 38 at the top of the collection box 35. The suction force generated at the funnel-shaped opening of the catheter 1 draws the loose thrombus and blood into the inner lumen of the catheter 1. The blood mixed with the thrombus enters the collection box 35 through the catheter 1 and the connecting tube II 38. The filter 36 in the collection box 35 traps the solid thrombus particles. The filtered blood passes through the filter 36 into the lower part of the collection box 35 and can be drained into the external collection bag through the return tube 37 at the bottom. This part of the blood can be reinfused as needed. S8. Throughout the entire operation, the air pressure sensor 34 on connecting pipe I 33 continuously monitors the negative pressure peak in the pipeline. The system has a set safe negative pressure threshold. When the negative pressure peak in the pipeline is lower than this safe threshold, the protection mechanism does not activate, and the electromagnet 42 remains energized. The magnetic attraction between the electromagnet 42 and the magnet block 41 is sufficient to overcome the downward attraction of the negative pressure on the piston plate II 40 and the tension of the tension spring 43, keeping the piston plate II 40 at the top of the buffer cylinder 39 without affecting the normal operation of the pipeline. Once the negative pressure peak in the pipeline exceeds the preset safe threshold for some reason, the air pressure sensor 34 will detect the signal. After receiving this signal, the control circuit will immediately cut off the electromagnet. When the electromagnet 42 is powered off, the magnetic attraction between it and the magnet block 41 disappears. At this time, the downward attraction generated by the excessive negative pressure in the connecting pipe I 33 on the top of the piston plate II 40 will overcome the upward pulling force of the tension spring 43 and pull the piston plate II 40 downward, effectively reducing the instantaneous pressure peak in the connecting pipe I 33, thereby avoiding excessive negative pressure acting on the patient's blood vessels. When the pulse passes and the pipeline pressure rises, the piston plate II 40 is pulled back to the top of the buffer cylinder 39 and reset under the pulling force of the tension spring 43. The control system can be set to re-energize the electromagnet 42 after a delay, so that it can return to the magnetic attraction and locking state before the next pulse cycle. S9. The operator can also adjust the baseline negative pressure capacity through the negative pressure peak adjustment mechanism. By rotating the threaded rod 47 on the expansion box 44, the piston plate III 46 can be driven to rise or fall within the expansion box 44. When the piston plate III 46 rises, the additional volume connected to the negative pressure box 10 through the second connecting pipe 45 increases. This is equivalent to increasing the total effective chamber volume during the negative pressure accumulation stage. Under the same stroke of the piston plate I 11, the increased volume means a smaller pressure change amplitude, which leads to a lower final negative pressure peak. Conversely, lowering the piston plate III 46 reduces the additional volume, which is conducive to generating a higher negative pressure peak. The operator can observe the position of the piston plate III 46 through the viewing window 48, and thus finely adjust the intensity of the negative pressure pulse generated by the system as needed to adapt to the aspiration requirements of thrombi with different hardness and adhesion degree.

[0039] However, as is well known to those skilled in the art, the working principles and wiring methods of the electromagnet 42, the pressure sensor 34 and the permanent magnet synchronous motor 16 are all conventional means or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A tension-resistant traction suction catheter with a pulsed negative pressure source, characterized in that, The catheter (1) includes a funnel-shaped opening at one end, which is used to draw thrombi into the catheter (1) through the funnel opening. The catheter (1) includes an inner liner (2), a reinforcing liner (3), a supporting liner (4), and an outer liner (5), which are arranged from the inside to the outside. The reinforcing tube layer (3) is composed of a spiral metal mesh (6), and the spiral metal mesh (6) is made of multiple metal wires wound in a double spiral reverse winding manner on the outer wall of the inner lining tube layer (2) to improve the flexibility, flexural strength and fatigue resistance of the conduit (1); The supporting tube layer (4) is composed of multiple metal rings (7) and transverse metal wires (8). The multiple metal rings (7) are all sleeved on the outer wall of the spiral metal mesh (6). Adjacent metal rings (7) are fixedly connected by multiple transverse metal wires (8), which can both improve the tensile strength of the catheter (1) and prevent the inner lumen of the catheter (1) from collapsing.

2. The anti-tension traction suction catheter of a pulse negative pressure source according to claim 1, characterized in that, The inner liner tube layer (2) is made of polytetrafluoroethylene, the outer tube (5) is made of polyurethane, and the spiral metal mesh (6), metal ring (7) and transverse metal wire (8) are made of metal wire with super elasticity and shape memory properties, such as nickel-titanium alloy wire.

3. A pulse negative pressure source driving device, used to provide a negative pressure source for the anti-tension traction suction catheter of the pulse negative pressure source as described in claim 1, characterized in that, Includes an outer shell (9), and a negative pressure box (10) is installed on the bottom inner wall of the outer shell (9), and a piston plate I (11) is sealed and slidably connected inside the negative pressure box (10). A negative pressure drive mechanism is installed inside the housing (9) and connected to the piston plate I (11) for driving the piston plate I (11) to reciprocate to generate negative pressure in the negative pressure box (10); Connecting pipe I (33), one end of which is connected to the side of the negative pressure box (10) away from the piston plate I (11), and the other end extends to one side of the outer shell (9); It also includes a pulse mechanism, which is disposed in the negative pressure box (10) and corresponds to the port of the connecting pipe I (33). The pulse mechanism includes a rotating shaft (27) and a closed disk (29) installed on the outer wall of the rotating shaft (27). The closed disk (29) is used to close the port of the connecting pipe I (33).

4. The pulse negative pressure source driving device according to claim 3, characterized in that, It also includes a collection box (35) disposed on one side of the outer shell (9), the end of the connecting tube I (33) away from the outer shell (9) extends into the collection box (35), the top of the collection box (35) is connected to a connecting tube II (38) for connecting the catheter, a filter screen (36) is installed inside the collection box (35), and the bottom of the collection box (35) is connected to a return tube (37).

5. The pulse negative pressure source driving device according to claim 4, characterized in that, The negative pressure drive mechanism includes a permanent magnet synchronous motor (16), a rotating disk (17), a pin (18), a moving frame (14), and a pull rod (13). The permanent magnet synchronous motor (16) is installed on the bottom inner wall of the outer shell (9). The rotating disk (17) is rotatably connected to the inner shell (9) and connected to the output shaft of the permanent magnet synchronous motor (16). The pin (18) is fixed at the eccentric position of the rotating disk (17). The moving frame (14) is fixedly connected to one end of the pull rod (13). The other end of the pull rod (13) is fixedly connected to the piston plate I (11). A strip groove (15) is provided on the moving frame (14). The pin (18) extends into the strip groove (15) and slides and hinges with the strip groove (15).

6. The pulse negative pressure source driving device according to claim 5, characterized in that, The pulse mechanism also includes a rotating arm (28), a spur gear (31), a lifting plate (22), a spring (23), a sliding rod (25), a rack (26), trapezoidal block I (19), and trapezoidal block II (24); The rotating arm (28) is fixedly sleeved on the outer wall of the rotating shaft (27) and fixedly connected to the closed disc (29). The spur gear (31) is fixed to the end of the rotating shaft (27). The lifting plate (22) is slidably disposed above the negative pressure box (10) by multiple vertical rods (21). Multiple springs (23) are connected between the top of the lifting plate (22) and the top inner wall of the protective box I (20). The sliding rod (25) is fixed to the lifting plate. The bottom of the plate (22) is sealed and slides into the negative pressure box (10). The rack (26) is fixed to one side of the sliding rod (25) and meshes with the spur gear (31). The trapezoidal block I (19) is fixed to the side of the piston plate I (11) near the pull rod (13). The trapezoidal block II (24) is fixed to the bottom of the lifting plate (22) and slides into the negative pressure box (10), and cooperates with the trapezoidal block I (19). The pulse mechanism also includes a limiting plate (30) fixed to the inner wall of the negative pressure box (10), the limiting plate (30) being used to stop the closed disk (29) when the spring (23) drives it to reset.

7. The pulse negative pressure source driving device according to claim 6, characterized in that, It also includes a protection mechanism, which includes a buffer cylinder (39) fixedly connected to the connecting pipe I (33), a piston plate II (40) slidably connected to the buffer cylinder (39), a magnet block (41) fixed to the inner wall of the top of the buffer cylinder (39), an electromagnet (42) fixed to the top of the piston plate II (40), and a tension spring (43) connected between the top of the piston plate II (40) and the inner wall of the top of the buffer cylinder (39).

8. The pulse negative pressure source driving device according to claim 7, characterized in that, It also includes a pressure sensor (34), which is disposed on the outer wall of the connecting pipe I (33) and is used to detect the negative pressure peak in the connecting pipe I (33) and control the on / off state of the electromagnet (42).

9. A pulse negative pressure source driving device according to claim 8, characterized in that, It also includes a protective box II (32) fixed to the inner wall of the negative pressure box (10), the end of the rotating shaft (27) and the bottom end of the sliding rod (25) are sealed and extended into the protective box II (32), and the spur gear (31) and the rack (26) are located inside the protective box II (32).

10. A pulse negative pressure source driving device according to claim 9, characterized in that, It also includes an expansion box (44) fixed inside the outer shell (9). The bottom of the expansion box (44) is connected to the top of the negative pressure box (10) through a plurality of second connecting pipes (45). A piston plate III (46) is slidably connected inside the expansion box (44). A threaded rod (47) is rotatably connected to the top of the piston plate III (46). The top end of the threaded rod (47) is threadedly connected to the top of the expansion box (44).

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