Thrombus suction device and thrombus suction operation kit

Abstract

This invention discloses a thrombus aspiration device and a thrombus aspiration surgical kit. The thrombus aspiration device includes a syringe; a piston rod, the front end of which extends into the syringe and moves with the syringe piston, and the rear end of which protrudes outside the syringe; and a check valve, disposed between the syringe and the piston rod, having an unlocked state that allows the piston rod to move axially and a locked state that restricts the piston rod from moving forward axially. The check valve is configured to switch back and forth between the unlocked and locked states in response to the rotation of the piston rod; alternatively, the rear end of the piston rod has a switch element, and the check valve is configured to switch back and forth between the unlocked and locked states in response to the switching action of the switch element. This invention provides a thrombus aspiration device and a thrombus aspiration surgical kit that maintains the current position of the piston rod after the piston rod is pulled out to create a negative pressure environment inside the syringe and the force applied by the hand is removed.

Description

Technical Field

[0001] This invention relates to the technical field of medical devices related to clinical thrombus removal, specifically a thrombus aspiration device and a thrombus aspiration surgical kit. Background Technology

[0002] In interventional procedures, using the negative pressure generated by a syringe to remove thrombi from a patient's blood vessels is a very common clinical procedure. However, with existing syringes, once the piston rod is pulled to create negative pressure, it cannot be held in place. Therefore, medical staff need to continuously pull the piston rod to maintain the negative pressure suction inside the syringe. This method not only consumes a significant amount of a medical staff's time, but also causes hand strain due to the staff continuously holding the syringe, which is detrimental to their occupational health. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art: to provide a thrombus aspiration device and thrombus aspiration surgical kit, which can maintain the current position of the piston rod after the negative pressure environment inside the syringe is formed by the piston rod being pulled out.

[0004] Therefore, one object of the present invention is to provide a thrombus aspiration device, comprising: Syringe; The piston rod has its front end inserted into the syringe and moves with the syringe piston, while its rear end protrudes outside the syringe. The anti-reverse device is located between the syringe and the piston rod, and has an unlocked state that allows the piston rod to move axially and a locked state that restricts the piston rod from moving forward axially. The anti-reverse device is configured to switch back and forth between an unlocked state and a locked state in response to the rotation of the piston rod; or, the rear end of the piston rod is provided with a switch, and the anti-reverse device is configured to switch back and forth between an unlocked state and a locked state in response to the switching action of the switch.

[0005] The aforementioned thrombus aspiration device allows medical personnel to control the check valve to switch to the locked state by rotating the piston rod or by using the exposed switch on the rear end of the piston rod after pulling the piston rod. This restricts the axial relative movement between the piston rod and the syringe, keeping the piston rod in its current position and maintaining negative pressure inside the syringe. Therefore, medical personnel do not need to continuously pull the piston rod, saving manpower.

[0006] According to one embodiment of the invention, the anti-reverse device includes a plurality of friction blocks circumferentially and evenly arranged around a piston rod. The friction blocks are radially movably connected to the piston rod, and the switching element is driven to the friction blocks via a transmission component, such that the switching element can drive the friction blocks to move radially until the friction blocks abut against or disengage from the inner wall of the syringe. The piston rod's current position is maintained by the frictional force between the friction blocks and the syringe. This structure does not alter the syringe structure and can utilize existing conventional syringe structures, thus offering good versatility.

[0007] According to an example of the present invention, a linkage mechanism is provided between the friction block and the piston rod. The linkage mechanism includes two parallel connecting rods, which are arranged at intervals along the axial direction of the piston rod. The two ends of the connecting rods are respectively hinged to the piston rod and the friction block, and the position where the connecting rod is connected to the piston rod is higher than the position where the connecting rod is connected to the friction block. The switching element is a lever; The transmission component is a pull rope, one end of which is connected to a paddle, and the other end is connected to a friction block through a channel inside the piston rod. The piston rod is provided with a preload for driving the friction block to move radially outward.

[0008] The technical solution of this application unlocks the friction block by pulling a pull cord with a lever. After releasing the lever, the pre-tightening component automatically resets, ensuring a tight fit between the friction block and the syringe, thereby locking the piston rod. This method is convenient for medical staff to operate and eliminates the possibility of forgetting to switch the anti-reverse device to the locked state, which could cause the piston rod to move forward.

[0009] According to one embodiment of the present invention, the friction block and the piston rod are radially slidably engaged, the transmission component is a straight rod, the straight rod is slidably engaged with the center hole of the piston rod, the upper end of the straight rod is connected to the switching component, and the lower end of the straight rod abuts against the rear end of the friction block through a guide ramp.

[0010] According to an example of the present invention, the anti-reverse device includes a toothed sleeve and a rack. The toothed sleeve is connected to the rear end of the syringe. The rack is arranged axially and fixed. The toothed sleeve has protruding teeth at the positions corresponding to the rack. The piston rod drives the rack to rotate circumferentially, so that the rack meshes with or is misaligned with the protruding teeth on the toothed sleeve.

[0011] The technical solution of this application achieves axial limiting by rotating the piston rod to achieve meshing between the rack and the convex teeth. After the rack and the convex teeth mesh, the structure is firm and stable.

[0012] Therefore, another object of the present invention is to provide a thrombus aspiration surgical kit, comprising at least one of the above-described thrombus aspirators, said thrombus aspirator being placed in a sterile packaging bag.

[0013] The above technical solution has the following advantages or beneficial effects: First, the anti-reverse device is controlled by the rotation of the piston rod or the exposed switch at the rear end of the piston rod, thereby locking or unlocking the piston rod and the syringe through the anti-reverse device. This eliminates the need for medical staff to continuously pull the piston rod, saving manpower. Second, the pre-tightening component can drive the friction block to move automatically outward and press tightly against the inner wall of the syringe. Therefore, when the medical staff releases the lever, the friction block can automatically switch to the locked state under the force of the pre-tightening component. At the same time, the two connecting rods in the linkage mechanism adopt an inclined connection method with the inner connection position higher and the outer connection position lower. This inclined connecting rod can convert part of the downward force when the piston rod is subjected to an axial downward force into a radial outward pressure on the connecting rod, making the squeezing force between the friction block and the inner wall of the syringe greater, resulting in an increase in static friction.

[0014] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first structure of the thrombus aspiration device of the present invention.

[0016] Figure 2 for Figure 1 A front view of a thrombus aspiration device.

[0017] Figure 3 for Figure 2 A cross-sectional view along the "AA" direction.

[0018] Figure 4 for Figure 3 A magnified view of a portion of region "B".

[0019] Figure 5 for Figure 1 A schematic diagram of the internal structure of a thrombus aspiration device.

[0020] Figure 6 for Figure 5 A magnified view of a portion of the "C" region.

[0021] Figure 7 This is a schematic diagram of the second structure of the thrombus aspiration device of the present invention.

[0022] Figure 8 for Figure 7 A half-section diagram of a thrombus aspiration device.

[0023] Figure 9 for Figure 8 A magnified view of a portion of the "D" region.

[0024] Figure 10 for Figure 7 A schematic diagram of the internal structure of a thrombus aspiration device.

[0025] Figure 11 for Figure 10 An enlarged schematic diagram of the internal structure of the "E" region.

[0026] Figure 12 for Figure 7 Disassembly diagram of a sample of a thrombus aspiration device.

[0027] Figure 13 This is a schematic diagram of the third structure of the thrombus aspiration device of the present invention.

[0028] Figure 14 for Figure 13 A schematic diagram of a thrombus aspiration device.

[0029] Figure 15 for Figure 14 A schematic diagram of a rack rotating to the locked position.

[0030] Among them, 100 is a syringe; 200 is a piston rod; 300 is a piston block; 400 is a check valve; 500 is a switching component; and 600 is a disposable three-way valve. 1. Friction block; 2. Connecting rod; 3. Paddle; 4. Pull rope; 5. Slide groove; 6. Slider; 7. Center hole; 8. Straight rod; 9. Center hole; 10. Cam; 11. Cam seat; 12. Guide slope; 13. Receiving groove; 14. Guide rail groove; 15. Guide rail; 16. Toothed sleeve; 16.1. Raised tooth; 17. Rack; 18. Baffle. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] The thrombus aspiration device and thrombus aspiration surgical kit according to embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0033] Example 1 The present invention provides a thrombus aspiration device, as shown in the figure, including a syringe 100, a piston rod 200 and a check valve 400.

[0034] The syringe 100 has an open rear end and an interface with a diameter smaller than the inner diameter of the syringe 100 at the front end, which is connected to the inner cavity of the syringe 100.

[0035] The piston rod 200 has a piston block 300 at its front end. The front end of the piston rod 200, together with the piston block 300, extends axially into the syringe 100 from the rear end of the syringe 100. The piston rod 200 drives the piston block 300 to perform piston movement between the syringe 100 and the syringe 100. The rear end of the piston rod 200 is exposed outside the syringe 100, and the exposed rear end of the piston rod 200 has a gripping part for human hand gripping.

[0036] The anti-reverse device 400 is disposed between the syringe 100 and the piston rod 200. The anti-reverse device 400 has an unlocked state and a locked state. When the anti-reverse device 400 is in the unlocked state, it allows the piston rod 200 to move forward or backward along the axial direction. When the anti-reverse device 400 is in the locked state, it can restrict the piston rod 200 from moving forward along the axial direction. That is, the anti-reverse device 400 in the locked state can prevent the piston rod 200 from moving forward relative to the syringe 100 along the axial direction.

[0037] Optionally, in the above embodiment, the rotation of the piston rod 200 can drive the anti-reverse device 400 to switch between an unlocked state and a locked state. The switching action of the anti-reverse device 400 between the unlocked and locked states is associated with the rotation action of the piston rod 200, so that the anti-reverse device 400 can reciprocate between the unlocked and locked states in response to the rotation action of the piston rod 200. Specifically, the forward and reverse rotation of the piston rod 200 corresponds to the unlocking and locking actions of the anti-reverse device 400, respectively, ultimately causing the anti-reverse device 400 to reciprocate between the unlocked and locked states.

[0038] Optionally, in the above embodiment, the piston rod 200 is provided with a switch element 500, which is located at the rear end of the piston rod 200 exposed outside the syringe 100. The anti-reverse device 400 is configured to reciprocate between an unlocked state and a locked state in response to the switching action of the switch element 500. Specifically, the switching action of the anti-reverse device 400 between the unlocked state and the locked state is associated with the switching action of the switch element 500, so that the anti-reverse device 400 can reciprocate between the unlocked state and the locked state in response to the switching action of the switch element 500.

[0039] Example 2 Based on the preferred embodiment of the above, such as Figures 1-6As shown, this embodiment provides a first-structure anti-reverse device 400. The anti-reverse device 400 includes a plurality of friction blocks 1 evenly arranged circumferentially around the piston rod 200. The friction blocks 1 are radially movably connected to the piston rod 200. The switching element 500 is connected to the friction blocks 1 through a transmission component, so that the switching element 500 can drive the friction blocks 1 to move radially outward until the friction blocks 1 abut against the inner wall of the syringe 100, or the friction blocks 1 can move radially inward to reset, thereby reducing the friction between the friction blocks 1 and the inner wall of the syringe 100 until the friction blocks 1 disengage from the inner wall of the syringe 100.

[0040] Optionally, a linkage mechanism is provided between the friction block 1 and the piston rod 200, and each friction block 1 is connected to the piston rod 200 through the linkage mechanism. Specifically, the linkage mechanism is a four-bar linkage, which includes two parallel connecting rods 2. The two connecting rods 2 are arranged at intervals along the axial direction of the piston rod 200. The two ends of the connecting rods 2 are respectively hinged to the piston rod 200 and the friction block 1, and the position where the connecting rod 2 is connected to the piston rod 200 is higher than the position where the connecting rod 2 is connected to the friction block 1.

[0041] Furthermore, the switch 500 is a paddle 3, which is mounted on the rear end of the piston rod 200 and can be displaced when subjected to external force. Thus, when the medical staff flicks the paddle 3, the paddle 3 can transmit the motion to the friction block 1 through the transmission component to control the movement of the friction block 1.

[0042] Furthermore, the piston rod 200 is provided with a pre-tightening member for driving the friction block 1 to move radially outward. The transmission component is a pull rope 4, one end of which is connected to the lever 3, and the other end is connected to the friction block 1 through a channel inside the piston rod 200. One end of the pull rope 4 is tied to the movable connecting end of the lever 3, and the other end of the pull rope 4 is fixedly connected to the inner side of the friction block 1. In this embodiment, the pulling force provided by the pull rope 4 can pull the friction block 1 to move radially inward, thereby reducing the friction between the outer side of the friction block and the inner wall of the syringe 100 until the friction block 1 disengages from the inner wall of the syringe 100. When the force on the lever 3 is removed, the tension of the pull rope 4 on the friction block 1 disappears simultaneously. At this time, the pre-tightening component can drive the friction block 1 to press again against the inner wall of the syringe 100. Since the connection position between the connecting rod 2 and the piston rod 200 is higher than the connection position between the connecting rod 2 and the friction block 1, the vacuum negative pressure at the front end of the piston block 300 acting on the piston block 300 to move forward will be converted into the squeezing force of the connecting rod 2 pushing the friction block 1 outward in the horizontal direction.

[0043] Optionally, in this embodiment, the preload is a torsion spring (not shown in the figure) installed at the connection between the connecting rod 2 and the piston rod 200. Specifically, the end of the connecting rod 2 is hinged to the mounting seat on the piston rod 200 via a hinge shaft, and a torsion spring is sleeved on the hinge shaft. The two ends of the torsion spring are fixed to the piston rod 200 and the connecting rod 2, respectively. Thus, under the action of the elastic restoring force of the torsion spring itself, the connecting rod 2 is driven to have a tendency to swing upward around the hinge shaft.

[0044] Optionally, the rear end of the piston rod 200 is provided with an axially extending groove 5, and a slider 6 is provided in the groove 5. The slider 6 is slidably engaged in the groove 5. One end of the paddle 3 is fixed to the slider 6, and the other end of the paddle 3 extends outward in a horizontal direction to form a plate-like structure. The center line of the piston rod 200 has a central hole 7 for the pull rope 4 to pass through. One end of the pull rope 4 is fixed to the slider 6, and the other end extends through the central hole 7 to the location of the friction block 1 and is fixedly connected to the inner side of the friction block 1. The piston rod has a small hole at the position corresponding to the friction block 1 for the pull rope 4 to pass through.

[0045] Optionally, there are two friction blocks 1, which are symmetrically arranged along the longitudinal section containing the center line of the piston rod 200. Specifically, the friction blocks 1 are preferably rubber blocks.

[0046] Example 3 Based on the preferred embodiment of the above, such as Figures 7-12 As shown, this embodiment provides a second type of anti-reverse device 400. The anti-reverse device 400 includes a plurality of friction blocks 1 evenly arranged circumferentially around the piston rod 200. The friction blocks 1 are radially movably connected to the piston rod 200. The switching element 500 is connected to the friction blocks 1 through a transmission component, so that the switching element 500 can drive the friction blocks 1 to move radially outward until the friction blocks 1 abut against the inner wall of the syringe 100, or the friction blocks 1 can move radially inward to reset, thereby reducing the friction between the friction blocks 1 and the inner wall of the syringe 100 until the friction blocks 1 disengage from the inner wall of the syringe 100.

[0047] Optionally, the friction block 1 and the piston rod 200 are radially slidably coupled. The transmission component is a straight rod 8, which is slidably coupled to the center hole 9 of the piston rod 200. The upper end of the straight rod 8 is connected to the switch component 500, and the lower end of the straight rod 8 abuts against the tail end of the friction block 1 via a guide ramp 12. In this embodiment, the radially slidable coupling means that when the friction block 1 slides relative to the piston rod 200, the friction block 1 has a radial displacement relative to the piston rod 200. During this sliding process, whether the piston rod 200 also has axial movement or not, it is within the scope of the technical solution of this embodiment.

[0048] Specifically, the piston rod is provided with a plurality of receiving grooves 13, the number of receiving grooves 13 being the same as the number of friction blocks 1, and the inner cavity of the receiving grooves 13 matching the outer contour of the friction blocks 1, thereby allowing the friction blocks 1 to slide in the receiving grooves 13, and thus enabling the friction blocks 1 to move radially. The rear ends of each receiving groove 13 away from the groove opening are interconnected. The lower end of the straight rod 8 protrudes into the area where each receiving groove 13 is interconnected, and the lower end of the straight rod 8 is provided with a top block. The top block is provided with a first guide slope at a position corresponding to the rear end of each friction block 1, and the rear end of each friction block 1 is also provided with a second guide slope that matches the first guide slope. Thus, the axial thrust of the straight rod 8 toward the position of the friction block 1 can be converted into a radial outward component force through the first guide slope and the second guide slope. The component force drives each friction block 1 to move outward, and finally the outer wall of the friction block 1 is tightly fitted with the inner wall of the syringe 100, so that the anti-reverse device 400 is in a locked state. In this embodiment, when the downward thrust of the straight rod 8 is eliminated, the component force of the friction block 1 on the inner wall of the syringe 100 is eliminated simultaneously. Therefore, the friction between the outer wall of the friction block 1 and the inner wall of the syringe 100 can be reduced until the friction is zero. At this time, the anti-reverse device 400 is in the unlocked state.

[0049] In a preferred embodiment, the switching element includes a cam seat 11 and a cam 10. The cam seat 11 is fixed to the rear end of the piston rod 200, and the cam 10 is hinged to the cam seat 11. The upper end of the straight rod 8 extends axially upward to abut against the cam 10. The rotation of the cam 10 applies axial downward pressure to the straight rod 8, causing it to move downward. This, in turn, drives each friction block 1 radially outward through the guide ramp until it is tightly fitted with the inner wall of the syringe 100. At this time, the anti-reverse device 400 is in a locked state. By rotating the cam 10 in the opposite direction, the constraint of the cam 10 on the straight rod 8 can be released. At this time, the pressure between the inner wall of the syringe 100 and the friction block 1 can react on the straight rod 8 through the guide ramp, driving the straight rod 8 upward. Simultaneously, the pressure between the inner wall of the syringe 100 and the friction block 1 decreases until the friction is zero. At this time, the anti-reverse device 400 is in an unlocked state.

[0050] It should be understood that using a cam to drive a rod-shaped component to move along its own length is a conventional technique in the field of mechanical transmission. In this embodiment, replacing the switch with other conventional components to drive the rod to reciprocate along the axial direction should also fall within the protection scope of this technical solution.

[0051] In a preferred embodiment as described above, there are two friction blocks 1, which are symmetrically arranged along the longitudinal section containing the center line of the piston rod 200. Specifically, the friction block 1 is preferably a rubber block.

[0052] Optionally, such as Figures 10-11As shown, the inner sidewall of the receiving groove 13 is provided with a guide rail groove 14, and the friction block 1 is provided with a guide rail 15 on the sidewall corresponding to the guide rail groove 14, which matches the guide rail groove 14. The guide rail 15 and the guide rail groove 14 are in sliding fit.

[0053] Furthermore, the guide rail groove 14 extends radially outward and is inclined axially downward. The receiving groove 13 has a trumpet-shaped structure, and the axial height of the groove opening of the receiving groove 13 is greater than the axial height of the groove bottom. In this embodiment, the friction block 1 can move along the direction of the guide rail groove 14, that is, the friction block 1 can move radially outward and axially downward at the same time. Therefore, the force exerted by the straight rod 8 on the friction block 1 has a larger component in the extending direction of the guide rail groove 14.

[0054] Example 4 Based on the preferred embodiment of the above, such as Figures 13-15 As shown, this embodiment provides a third type of anti-reverse device 400. The anti-reverse device 400 includes a toothed sleeve 16 and a rack 17. The toothed sleeve 16 is connected to the rear end of the syringe 100. The rack 17 is axially arranged and fixed. The toothed sleeve 16 has protruding teeth 16.1 at positions corresponding to the rack 17. The piston rod 200 drives the rack 17 to rotate circumferentially, causing the rack 17 to engage or displace the protruding teeth 16.1 on the toothed sleeve 16. When the protruding teeth 16.1 engage with the rack 17, the piston rod 200 is axially confined within the syringe 100, at which time the anti-reverse device 400 is in a locked state. When the tooth 16.1 and the rack 17 rotate relative to each other in the circumferential direction until they are misaligned, the rack 17 is freed from the constraint of the tooth 16.1. Therefore, the piston rod 200 can move freely in the axial direction, that is, the piston rod 200 can make piston movements in the axial direction. At this time, the check valve 400 is in the unlocked state.

[0055] Optionally, the toothed sleeve 16 is detachably connected to the syringe 100. The toothed sleeve 16 has two baffles 18 spaced apart circumferentially. The rack 17 is circumferentially positioned between the two baffles 18. The protruding teeth 16.1 are arranged on the inner sidewall of the toothed sleeve 16 and located between the two baffles 18. When the rack 17 abuts against one of the baffles 18, the rack 17 engages with the protruding teeth 16.1.

[0056] Specifically, the toothed sleeve 16 is snapped together with the rear end of the syringe 100.

[0057] Preferably, the two baffles 18 are spaced 90° apart circumferentially. The protruding tooth 16.1 is arranged on the inner wall of the toothed sleeve 16 between the two baffles 18, and the protruding tooth 16.1 is located near one of the baffles 18. In this embodiment, the baffle 18 adjacent to the protruding tooth 16.1 is the first baffle 18. The forward rotation of the rack 17 causes the rack 17 to abut against the first baffle 18, at which time the rack 17 and the protruding tooth 16.1 are engaged. Conversely, the reverse rotation of the rack 17 causes the rack 17 to move away from the first baffle 18, at which time the rack 17 and the protruding tooth 16.1 are misaligned.

[0058] Example 5 Based on the thrombus aspirator in the above embodiments, this application provides a thrombus aspiration surgical kit, including at least one thrombus aspirator from each of the above embodiments, wherein the thrombus aspirator is placed in a sterile packaging bag.

[0059] Furthermore, the thrombus aspiration kit includes two thrombus aspirators and a disposable three-way valve 600. Both thrombus aspirators and the disposable three-way valve 600 are housed in the same sterile packaging bag. The disposable three-way valve 600 is preferably a commonly used disposable three-way stopcock valve in clinical practice. This three-way valve has two male connectors and one female connector. The two male connectors are configured to mate with the interface on the aspiration port at the front end of the syringe 100, and the female connector is configured to mate with the tubing interface on the vascular catheter. Simultaneously, the female connector corresponds to the interface on the aspiration port of the syringe 100.

[0060] It should be understood that, depending on the actual needs of use, the internal volume (capacity) of the syringe 100 is set to 50ml, 100ml, 150ml, 200ml, etc., and the outer wall of the syringe 100 is provided with scale lines.

[0061] The method of using the thrombus aspiration surgical kit in the above embodiments that requires greater negative pressure: After opening the sterile packaging bag, connect the suction ports at the front end of the syringes 100 on both thrombus aspirators to the two male connectors on the disposable three-way valve 600, respectively. Connect the female connector on the disposable three-way valve 600 to the connector of the vascular catheter on the patient. Tighten the valve core of the disposable three-way valve 600 to the position where the two male connectors and the female connector are not connected. Then, pull the piston rods 200 on the two syringes 100 in sequence. At the same time, the check valves 400 on each piston rod 200 can prevent the piston rods 200 from retracting. At this time, a negative pressure environment is established in both syringes 100. Then, tighten the valve core of the three-way valve to connect the two male connectors to the female connector at the same time, thereby providing a larger negative pressure suction to cope with the situation where the negative pressure suction of a single thrombus aspirator is insufficient.

[0062] The method of using the thrombus aspiration surgical kit in the above embodiments, which involves repeated alternating aspiration of thrombi and emptying of the syringe: After removing the sterile packaging bag, connect the aspiration ports at the front of the syringes 100 on both thrombus aspiration devices to the two male connectors on the disposable three-way valve 600, respectively. Connect the female connector on the disposable three-way valve 600 to the connector of the vascular catheter on the patient. Tighten the valve core of the disposable three-way valve 600 to the position where the two male and female connectors are not connected. Then, pull the piston rods 200 on the two syringes 100 in sequence. At the same time, the check valves 400 on each piston rod 200 can prevent the piston rods 200 from retracting. At this time, a negative pressure environment is established in both syringes 100. Then, tighten the valve core of the three-way valve to connect the first male connector to the female connector, thereby providing negative pressure suction. After the first syringe 100 is full of fluid and can no longer provide sufficient negative pressure suction, tighten the valve core of the three-way valve to connect the second male connector to the female connector to continue providing negative pressure suction. At the same time, the first syringe 100 can be disassembled and emptied, and then reconnected to the three-way valve. Although syringe 100 also needs to be disassembled during this process, the disassembly process does not affect the negative pressure suction provided by the other syringe 100 to the vascular catheter, thus ensuring that the vascular catheter can obtain continuous and stable negative pressure suction. At the same time, the two thrombus aspirators are used alternately, saving the waiting time for emptying and cleaning syringe 100.

[0063] Preferably, a thrombus aspirator can also be used. After opening the sterile packaging bag, connect the aspiration port at the tip of the syringe 100 of the thrombus aspirator to the first male connector on the disposable three-way valve 600. Connect the female connector on the disposable three-way valve 600 to the connector of the vascular catheter on the patient. Then connect the second male connector to the waste collection container through the existing infusion tubing. Next, screw the valve core of the disposable three-way valve 600 to a position where neither male connector is connected to the female connector. Then, pull the piston rod 200 on the syringe 100 in sequence. Simultaneously, the check valve 400 on the piston rod 200 prevents the piston rod 200 from retracting. At this time, a negative pressure system is established inside the syringe 100. Pressurize the environment, then turn the valve core of the three-way valve to connect the first male connector with the female connector, thereby providing negative pressure suction. After the syringe 100 is filled with liquid and can no longer provide sufficient negative pressure suction, turn the valve core of the three-way valve to connect the first male connector with the second male connector, while disconnecting it from the female connector. Then, control the paddle 3 on the piston rod 200 to release the locking state of the friction block 1, push the piston rod 200 to discharge the liquid drawn into the syringe 100 through the second male connector into the waste liquid container. Then, turn the valve core of the three-way valve to disconnect both male connectors from the female connector, pull the piston rod 200 again to establish negative pressure, and finally connect the first male connector with the female connector. Although the negative pressure provided to the vascular catheter is discontinuous during this process, and the negative pressure needs to be re-established after the liquid in the syringe 100 is emptied, i.e., the negative pressure suction is provided periodically, the syringe 100, the three-way valve and the vascular catheter do not need to be physically disconnected during the entire process. Therefore, the sterility is better, and the operation saves the work of disconnecting and reconnecting, making it more convenient.

[0064] It should be noted that in the description of this invention, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0070] For those skilled in the art, various changes and modifications will undoubtedly be apparent after reading the above description. Therefore, the appended claims should be construed as covering all changes and modifications that encompass the true intent and scope of the invention. Any and all equivalent scope and content within the scope of the claims should be considered to remain within the intent and scope of the invention.

Claims

1. A thrombus aspiration device, comprising: Syringe; The piston rod has its front end inserted into the syringe and moves with the syringe piston, while its rear end protrudes outside the syringe. Its characteristic is that it further includes: The anti-reverse device is located between the syringe and the piston rod, and has an unlocked state that allows the piston rod to move axially and a locked state that restricts the piston rod from moving forward axially. The anti-reverse device is configured to switch back and forth between an unlocked state and a locked state in response to the rotation of the piston rod; or, the rear end of the piston rod is provided with a switch, and the anti-reverse device is configured to switch back and forth between an unlocked state and a locked state in response to the switching action of the switch.

2. The thrombus aspiration device according to claim 1, characterized in that: The anti-reverse device includes a plurality of friction blocks evenly arranged circumferentially around the piston rod. The friction blocks are radially movably connected to the piston rod. The switching element is connected to the friction blocks through a transmission component, so that the switching element can drive the friction blocks to move radially until the friction blocks abut against or disengage from the inner wall of the syringe.

3. The thrombus aspiration device according to claim 2, characterized in that: A linkage mechanism is provided between the friction block and the piston rod. The linkage mechanism includes two parallel connecting rods, which are arranged at intervals along the axial direction of the piston rod. The two ends of the connecting rods are respectively hinged to the piston rod and the friction block, and the position where the connecting rod is connected to the piston rod is higher than the position where the connecting rod is connected to the friction block. The switching element is a lever; The transmission component is a pull rope, one end of which is connected to a paddle, and the other end is connected to a friction block through a channel inside the piston rod. The piston rod is provided with a preload for driving the friction block to move radially outward.

4. The thrombus aspiration device according to claim 3, characterized in that: The preload element is a torsion spring installed at the connection between the connecting rod and the piston rod.

5. The thrombus aspiration device according to claim 3, characterized in that: The piston rod has an axially extending groove at its rear end, and a slider is provided in the groove. One end of the paddle is fixed to the slider. The piston rod has a central hole at its center line for the pull rope to pass through. One end of the pull rope is fixed to the slider, and the other end extends through the central hole to the location of the friction block and is fixedly connected to the inner side of the friction block.

6. The thrombus aspiration device according to claim 2, characterized in that: The friction block and the piston rod slide in a radial direction. The transmission component is a straight rod that slides in a center hole of the piston rod. The upper end of the straight rod is connected to the switch component, and the lower end of the straight rod abuts against the rear end of the friction block through a guide ramp.

7. The thrombus aspiration device according to any one of claims 2 to 6, characterized in that: There are two friction blocks, which are symmetrically arranged along the longitudinal section where the center line of the piston rod is located.

8. The thrombus aspiration device according to claim 1, characterized in that: The anti-reverse device includes a toothed sleeve and a rack. The toothed sleeve is connected to the rear end of the syringe. The rack is arranged axially and fixed to the cylinder. The toothed sleeve has protruding teeth at the positions corresponding to the rack. The piston rod drives the rack to rotate circumferentially, so that the rack meshes with or is misaligned with the protruding teeth on the toothed sleeve.

9. The thrombus aspiration device according to claim 8, characterized in that: The toothed sleeve is detachably connected to the syringe. The toothed sleeve has two baffles spaced apart circumferentially. The rack is circumferentially positioned between the two baffles. The protruding teeth are arranged on the inner sidewall of the toothed sleeve and located between the two baffles. When the rack abuts against one of the baffles, the rack engages with the protruding teeth.

10. A thrombus aspiration surgical kit, characterized in that: The invention includes at least one thrombus aspirator according to any one of claims 1 to 9, wherein the thrombus aspirator is placed in a sterile packaging bag.

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