Double-balloon thrombus extraction device

Abstract

The utility model provides a double-balloon thrombus extraction device, and belongs to the technical field of medical instruments. The double-balloon thrombus extraction device comprises a double-balloon catheter, a thrombus extraction tube and a sealing piece, the double-balloon catheter is movably sleeved with the thrombus extraction tube and the sealing piece, the sealing piece comprises a sleeve and a sealing ring, the sleeve is in sliding connection with the thrombus extraction tube, the sealing ring is clamped between the sleeve and the thrombus extraction tube, and the sealing ring is connected with the sleeve. The sealing ring movably abuts against the outer circle of the double-ball guide pipe. The double-ball catheter has the following effects that after the double-ball catheter fixes the embolism position and dissolves the embolism, the embolism extraction tube is moved so as to continuously go deep into the embolism position, the sealing ring is extruded every time the embolism extraction tube goes deep into the embolism position to lock the current position and seal the current position, negative pressure embolism suction can be started, the influence of vasoconstriction is avoided, and the embolism extraction efficiency is effectively improved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically, to a dual-balloon thrombectomy device. Background Technology

[0002] When thrombosis in a vein is treated surgically, stent thrombectomy or vascular aspiration can be performed.

[0003] In response, Chinese patent application CN202121289277.2 discloses a dual-balloon thrombolysis and thrombectomy device. This method mainly uses a dual-balloon catheter. Saline is injected into the first balloon at the distal end of the catheter, causing it to inflate and adhere to the inner wall of the blood vessel, blocking distal blood flow and preventing emboli escape. Thrombolytic drugs are then injected into the second balloon, which is released into the blood vessel through micropores on the surface of the second balloon to dissolve the thrombus. After thrombolysis, negative pressure is applied to the lumen of the access sheath through a hemostatic Y-valve to aspirate the dissolved thrombus. This significantly shortens the surgical treatment time window, improves clinical prognosis, and the entire process includes distal protection to prevent emboli escape, making the procedure safer.

[0004] However, in the process of implementing the technical solutions in the embodiments of this application, the inventors of this utility model discovered that the above-mentioned technology has at least the following technical problems:

[0005] The vascular Y-valve is used to fix the proximal end of the access sheath to the double balloon catheter as a whole, preventing it from moving along the catheter. When thrombus is aspirated, the negative pressure causes the blood vessels near the access sheath opening to constrict, hindering the aspiration of the distal thrombus and affecting the thrombus retrieval efficiency. Utility Model Content

[0006] To overcome the above deficiencies, this application provides a dual-balloon thrombectomy device, which aims to improve the problems mentioned in the background art.

[0007] This application provides a dual-balloon thrombectomy device, including a dual-balloon catheter, a thrombectomy tube, and a sealing element. The thrombectomy tube and the sealing element are movably sleeved on the dual-balloon catheter. The sealing element includes a sleeve and a sealing ring. The sleeve is slidably connected to the thrombectomy tube, and the sealing ring is clamped between the sleeve and the thrombectomy tube. The sealing ring is movably pressed against the outer circle of the dual-balloon catheter.

[0008] In one specific implementation, the dual-balloon catheter includes a tube body with two balloons arranged in series at the front end of the tube body, and pressure-responsive micropores distributed on the surface of the proximal balloons.

[0009] In one specific implementation, the rear end of the tube is provided with three interfaces that are respectively connected to the two balloons and the tube.

[0010] In the above implementation process, the three interfaces are respectively connected to the two balloons and the tube. After the distal balloon passes the embolism site, it expands by injecting saline through the interface, temporarily blocking the blood flow to the distal end and preventing small thrombi from escaping to the distal end. Then, thrombolytic drugs are injected into the proximal balloon through another interface, causing it to expand and squeeze the thrombus, causing the thrombus to break into small pieces. At the same time, due to the pressure inside the proximal balloon, the pressure-responsive micropores on its surface open, releasing drugs that soften or dissolve the thrombus, making the thrombus easier to aspirate.

[0011] In one specific implementation, the bolus extraction tube includes a sleeve and an extraction port, the extraction port being fixedly connected to the sleeve, and the sleeve being movably fitted around the outer circumference of the tube body.

[0012] In the above process, negative pressure is applied to the cannula through the suction port to draw out the thrombus.

[0013] In one specific implementation, the sleeve is slidably connected to the outer circle of the tube, and the sealing ring is clamped between the end faces of the sleeve and the tube.

[0014] In the above implementation process, the relative movement of the sleeve and the tube will stretch or compress the sealing ring. The sealing ring adopts a hollow structure. Under normal conditions, the sealing ring is in a contracted state and will not affect the passage of the balloon. When the sealing ring is compressed, the sealing ring is squeezed out and pressed against the outer circle of the tube, which plays a role in sealing and fixing. In another embodiment, the two ends of the sealing ring are fixedly connected to the end faces of the sleeve and the tube, respectively. When the sealing ring is stretched, the sealing ring contracts and the inner diameter increases so that the balloon can pass through.

[0015] In one specific implementation, a pin is elastically hinged to the sleeve, and an annular pin groove adapted to the pin is formed on the outer circumference of the sleeve.

[0016] In the above process, the two pin grooves correspond to the shrinking and extrusion states of the sealing ring. The pin rod is inserted into the pin groove to form a state lock.

[0017] In one specific implementation, two pins are provided, and the two pins are clamped together on the outer circumference of the sleeve.

[0018] In one specific embodiment, the seal further includes a circular rubber band that is fitted over the two pins.

[0019] In the above implementation process, the clip shape facilitates finger operation, and the rubber band keeps the two pins in a locked state to prevent them from coming off.

[0020] Compared with the prior art, the beneficial effects of this application are: after fixing the embolism position and dissolving the thrombus with a double-balloon catheter, the thrombectomy tube is moved to continuously penetrate deeper into the embolism position. Each time it penetrates deeper, the sealing ring is squeezed to lock the current position and seal it, and negative pressure thrombectomy can then begin, avoiding the influence of vasoconstriction and effectively improving the thrombectomy efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the dual-balloon thrombectomy device provided in the embodiments of this application;

[0023] Figure 2 A schematic diagram illustrating the connection relationship between the rubber band and the pin provided for an embodiment of this application;

[0024] Figure 3 A schematic diagram illustrating the connection relationship between the plunger and the seal provided in this embodiment of the application.

[0025] In the diagram: 10-Double-balloon catheter; 11-Tube body; 12-Balloon; 20-Plugging tube; 21-Cannula; 22-Plugging port; 30-Seal; 31-Sleeve; 32-Sealing ring; 33-Pin; 34-Rubber band. Detailed Implementation

[0026] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0027] Please see Figures 1-3 This application provides a dual-balloon thrombectomy device, including a dual-balloon catheter 10, a thrombectomy tube 20, and a sealing element 30. The thrombectomy tube 20 and the sealing element 30 are movably sleeved on the dual-balloon catheter 10. The sealing element 30 includes a sleeve 31 and a sealing ring 32. The sleeve 31 is slidably connected to the thrombectomy tube 20, and the sealing ring 32 is clamped between the sleeve 31 and the thrombectomy tube 20, and the sealing ring 32 is movably pressed against the outer circumference of the dual-balloon catheter 10. After the dual-balloon catheter 10 fixes the embolus position and dissolves the thrombus, the thrombectomy tube 20 is moved to continuously penetrate deeper into the embolus position. Each time it penetrates deeper, the sealing ring 32 is squeezed to lock the current position and seal, allowing negative pressure thrombectomy to begin. This avoids the influence of vasoconstriction and effectively improves the thrombectomy efficiency.

[0028] Please see Figures 1-3The dual-balloon catheter 10 includes a tube body 11, with two balloons 12 arranged in series at the front end of the tube body 11. The surface of the proximal balloon 12 is distributed with pressure-responsive micropores. The rear end of the tube body 11 has three interfaces that communicate with the two balloons 12 and the tube body 11, respectively. After the distal balloon 12 passes the embolism site, it inflates by injecting saline solution at the interface, temporarily blocking blood flow to the distal end and preventing small thrombus fragments from escaping distally. Then, thrombolytic drugs are injected into the proximal balloon 12 through the other interface, causing it to inflate and compress the thrombus, breaking it into smaller pieces. Simultaneously, due to the pressure inside the proximal balloon 12, the pressure-responsive micropores on its surface open, releasing drugs that soften or dissolve the thrombus, making it easier to aspirate.

[0029] Please see Figures 1-3 The thrombectomy tube 20 includes a cannula 21 and an extraction port 22. The extraction port 22 is fixedly connected to the cannula 21, and the cannula 21 is movably sleeved on the outer circumference of the tube body 11. Negative pressure is applied to the cannula 21 through the extraction port 22, thereby aspirating the thrombus.

[0030] Please see Figures 1-3 The sleeve 31 is slidably connected to the outer circle of the tube 21, and the sealing ring 32 is clamped between the end faces of the sleeve 31 and the tube 21. When the sleeve 31 and the tube 21 move relative to each other, the sealing ring 32 will be stretched or squeezed. The sealing ring 32 has a hollow structure. Under normal conditions, the sealing ring 32 is in a contracted state and will not affect the passage of the balloon 12. When the sealing ring 32 is squeezed, the sealing ring 32 is squeezed out and pressed against the outer circle of the tube 11, which plays a role in sealing and fixing. In another embodiment, the two ends of the sealing ring 32 are fixedly connected to the end faces of the sleeve 31 and the tube 21, respectively. When the sealing ring 32 is stretched, the sealing ring 32 contracts and the inner diameter increases so that the balloon 12 can pass through.

[0031] Please see Figures 1-3 A pin 33 is elastically hinged to the sleeve 31, and an annular pin groove adapted to the pin 33 is opened on the outer circle of the sleeve 21. The two pin grooves correspond to the contracted and extruded states of the sealing ring 32. The state is locked by inserting the pin 33 into the pin groove.

[0032] Please see Figures 1-3 There are two pins 33, which are clamped together on the outer circumference of the sleeve 31. The sealing element 30 also includes a circular rubber band 34, which is fitted onto the two pins 33. The clamp shape facilitates finger operation, and the rubber band 34 keeps the two pins 33 in a locked state, preventing them from coming off.

[0033] The working principle of this dual-balloon thrombectomy device is as follows: The tube body 11 and two balloons 12 at the front end are inserted into the cannula 21, and then inserted into the blood vessel, so that the two balloons 12 are located distal and mid-positions of the embolization site, respectively. After the balloons 12 inflate and release thrombolytic drugs through pressure-responsive micropores, the sleeve 31 is moved to the embolization site. The opening rod 33 is pinched to close the sleeve 31 and the cannula 21. Then the opening rod 33 is released, fixing the relative position of the sleeve 31 and the cannula 21. Simultaneously, the sealing ring 32 is squeezed out and pressed against the outer circumference of the tube body 11, forming an integral and tight seal with the tube body 11. The tube is sealed, and then negative pressure is applied into the sleeve 31 through the suction port 22. The thrombus is then aspirated through the inner end of the sleeve 21. When the position needs to be adjusted, the sealing ring 32 is loosened, the sleeve 21 is pushed deeper into the embolism location, and then the sealing ring 32 is squeezed out again, and negative pressure adsorption is performed again. In summary, after the double-balloon catheter 10 fixes the embolism location and dissolves the thrombus, the thrombectomy tube 20 is moved to continuously penetrate deeper into the embolism location. Each time it penetrates deeper, the sealing ring 32 is squeezed to lock the current position and seal it, and negative pressure thrombectomy can begin. This avoids the influence of vascular contraction and effectively improves the thrombectomy efficiency.

[0034] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, improvements, or equivalent substitutions made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

Claims

1. A dual-balloon thrombectomy device, comprising: The utility model provides a double ball catheter, draw bolt pipe and sealing element, the draw bolt pipe and the sealing element are movably sleeved on the double ball catheter, the sealing element includes sleeve (31) and sealing ring (32), the sleeve (31) is slidably connected with the draw bolt pipe (20), the sealing ring (32) is clamped between the sleeve (31) and the draw bolt pipe (20), and the sealing ring (32) is movably abutted to the outer circle of the double ball catheter (10).

2. The dual-balloon thrombectomy device of claim 1, wherein, The double ball catheter (10) includes a pipe body (11), two balloon (12) are arranged in series at the front end of the pipe body (11), and the balloon (12) at the proximal end is provided with pressure responsive micro-holes on the surface.

3. The dual-balloon thrombectomy device of claim 2, wherein, The pipe body (11) is provided with three interfaces at the rear end, which are communicated with the two balloon (12) and the pipe body (11) respectively.

4. The dual-balloon thrombectomy device of claim 3, wherein, The draw bolt pipe (20) includes a sleeve (21) and a draw port (22), the draw port (22) is fixedly communicated with the sleeve (21), and the sleeve (21) is movably sleeved on the outer circle of the pipe body (11).

5. The dual-balloon thrombectomy device of claim 4, wherein, The sleeve (31) is slidably connected with the outer circle of the sleeve (21), and the sealing ring (32) is clamped between the sleeve (31) and the end face of the sleeve (21).

6. The dual-balloon thrombectomy device of claim 5, wherein, The sleeve (31) is elastically hinged with a pin rod (33), and the outer circle of the sleeve (21) is provided with an annular pin groove matched with the pin rod (33).

7. The dual-balloon thrombectomy device of claim 6, wherein, The pin rod (33) is provided with two, and the two pin rods (33) are arranged in the form of a clip on the outer circle of the sleeve (31).

8. The dual-balloon thrombectomy device of claim 7, wherein, The sealing element (30) further includes a circular rubber band (34), and the rubber band (34) is sleeved on the two pin rods (33).

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