Vena cava filter retrieval device
By designing a vena cava filter retrieval device that combines a traction tube and traction assembly with a contrast ring, the problem of unstable filter hooking in existing devices has been solved, achieving efficient and reliable filter recovery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG HISCALE MEDICAL TECH CO LTD
- Filing Date
- 2025-03-21
- Publication Date
- 2026-05-29
AI Technical Summary
Existing vena cava filter removal devices have a low success rate when hooking the filter, resulting in inefficient retrieval.
A vena cava filter retrieval device is used, which includes a traction tube and first and second traction components. The first and second traction wires cooperate with the guide ring to ensure that the traction ring can reliably hook the retrieval hook. The position of the hook is detected by the imaging ring, and the conical opening structure assists the hook to enter.
This improves the success rate and efficiency of vena cava filter retrieval, ensuring reliable tightening of the hook after it enters the traction tube, thus achieving efficient retrieval.
Smart Images
Figure CN224292049U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical device technology, and in particular to a device for removing a vena cava filter. Background Technology
[0002] The use of vena cava filters can prevent fatal pulmonary embolism to the greatest extent. In clinical treatment, the best treatment option for younger patients with stable thrombosis is to remove the vena cava filter.
[0003] Currently, existing vena cava filters are typically removed using a traction wire with a loop at the tip to hook onto the filter's retrieval hook. Whether the hook will catch is largely a matter of luck, and it often fails to do so, making removal impossible. Therefore, further improvements are needed. Utility Model Content
[0004] To ensure the efficiency of venous vena cava filter retrieval, this application provides a venous vena cava filter removal device.
[0005] The vena cava filter removal device provided in this application adopts the following technical solution:
[0006] A vena cava filter removal device includes a traction tube and a first traction assembly and a second traction assembly installed within the traction tube. The first traction assembly includes a first traction wire, a first guide ring, and a first traction ring. One end of the first traction wire is connected to the first traction ring, and the other end extends through the first guide ring toward the rear end of the traction tube. The second traction assembly includes a second traction wire, a second guide ring, and a second traction ring. One end of the second traction wire is connected to the second traction ring, and the other end extends through the second guide ring toward the rear end of the traction tube. The second traction ring, the second guide ring, the first traction ring, and the first guide ring are sequentially arranged on the inner wall of the traction tube from the head end to the tail end, with the second traction ring located near the head end of the traction tube. The center of the first guide ring, the center of the second guide ring, and the axis of the traction tube are located in the same plane.
[0007] By adopting the above technical solution, during use, the traction tube is inserted into the catheter until the retrieval hook is positioned, ensuring the retrieval hook is fully inside the traction tube from its front end. Then, the first and second traction wires are pulled backward simultaneously. Under the action of the first and second traction wires, the first traction ring moves upward and tightens along the first guide ring, while the second traction ring moves downward and tightens along the second guide ring, thus securing the retrieval hook inside the traction tube. Next, with the traction wires fixed and the catheter stationary, the traction tube is pulled outward to retrieve the vena cava filter into the catheter, which can then be removed. Because both traction rings are simultaneously hooked onto the retrieval hook during retrieval, even with insufficient longitudinal force when pulling the traction tube outward, at least one traction ring will always hook onto the retrieval hook as the retrieval hook and traction rings move together, ensuring efficient retrieval.
[0008] Optionally, the first traction ring is bonded to the inner wall of the traction tube along the circumference of the traction tube.
[0009] Optionally, the second traction ring is bonded to the inner wall of the traction tube along the circumference of the traction tube.
[0010] Optionally, a first developing ring is provided on the traction tube near the head end of the traction tube of the second traction ring.
[0011] By adopting the above technical solution, the first developing ring is used to detect whether the recovery hook has entered the traction tube.
[0012] Optionally, a second developing ring is provided on the traction tube on the side of the first traction ring away from the head end of the traction tube.
[0013] By adopting the above technical solution, the second developing ring is used to detect whether the recovery hook has been fully entered into the traction tube, so as to determine whether the recovery hook has entered the correct position.
[0014] Optionally, the inner diameter of the traction tube head gradually decreases from the traction tube head to the tail end.
[0015] By adopting the above technical solution, if the recovery hook is tilted during the process of guiding it into the traction pipe, the tapered opening at the front end of the traction pipe can be used to gradually push the recovery hook into the traction pipe by rotating the traction pipe and pushing it forward, thus facilitating the entry of the recovery hook into the traction pipe.
[0016] Optionally, the tails of the first traction wire and the second traction wire are joined together to form a strand.
[0017] By adopting the above technical solution, the tails of the first traction wire and the second traction wire are combined into a strand, which makes it easier to pull the two traction wires at the same time in the subsequent process, so that the two traction rings contract at the same time and finally tighten on the recovery hook, thus ensuring that the traction rings contract and tighten simultaneously.
[0018] In summary, this application includes at least one of the following beneficial technical effects:
[0019] 1. Since both traction rings are simultaneously hooked onto the recovery hook during recovery, when pulling the traction tube outward, even if the longitudinal force is insufficient, as the recovery hook and traction rings move together, at least one traction ring will always hook onto the recovery hook, thus ensuring recovery efficiency.
[0020] 2. In actual use, the first developing ring can be used to detect whether the recovery hook has entered the traction tube; at the same time, the second developing ring can be used to detect whether the recovery hook has fully entered the traction tube, so as to determine whether the recovery hook has entered the correct position, so as to carry out the subsequent tightening operation of the recovery hook.
[0021] 3. If the retrieval hook is tilted during the process of guiding it into the traction tube, the tapered opening at the front end of the traction tube can be used to gradually push the retrieval hook into the traction tube by rotating the traction tube and pushing it forward, thus facilitating the retrieval hook's entry into the traction tube. Attached Figure Description
[0022] Figure 1 This is a cross-sectional structural schematic diagram of a vena cava filter removal device according to this application.
[0023] Figure 2 This is a schematic diagram showing the usage status of the first traction component or the second traction component in this application.
[0024] Explanation of reference numerals in the attached figures:
[0025] 1. Traction tube; 2. First traction wire; 3. First guide ring; 4. First traction ring; 5. Second traction wire; 6. Second guide ring; 7. Second traction ring; 8. First developing ring; 9. Second developing ring. Detailed Implementation
[0026] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.
[0027] This application discloses a device for removing a vena cava filter.
[0028] Reference Figure 1A vena cava filter removal device includes a traction tube 1 and a first traction assembly and a second traction assembly installed inside the traction tube 1. The first traction assembly includes a first traction wire 2, a first guide ring 3, and a first traction ring 4. One end of the first traction wire 2 is connected to the first traction ring 4, and the other end extends through the first guide ring 3 to the rear end of the traction tube 1. The second traction assembly includes a second traction wire 5, a second guide ring 6, and a second traction ring 7. One end of the second traction wire 5 is connected to the second traction ring 7, and the other end extends through the second guide ring 6 to the rear end of the traction tube 1. The second traction ring 7, the second guide ring 6, the first traction ring 4, and the first guide ring 3 are sequentially arranged on the inner wall of the traction tube 1 from the head end to the tail end, with the second traction ring 7 located near the head end of the traction tube 1. The center of the first guide ring 3, the center of the second guide ring 6, and the axis of the traction tube 1 are located in the same plane.
[0029] In this embodiment, the first traction ring 4 is bonded to the inner wall of the traction tube 1 along the circumference of the traction tube 1, the second traction ring 7 is bonded to the inner wall of the traction tube 1 along the circumference of the traction tube 1, and the tails of the first traction wire 2 and the second traction wire 5 are joined together and extended backward out of the traction tube 1.
[0030] Reference Figure 1 and Figure 2 In use, insert the traction tube 1 into the catheter until the retrieval hook is positioned, ensuring the retrieval hook is fully inside the traction tube 1 from its front end. Then, pull the first traction wire 2 and the second traction wire 5, which are now joined together. Under the action of the first traction wire 2 and the second traction wire 5, the first traction ring 4 moves upward along the first guide ring 3 and tightens, while the second traction ring 7 moves downward along the second guide ring 6 and tightens, thus securing the retrieval hook inside the traction tube 1. Next, after securing the traction wires and keeping the catheter stationary, pull the traction tube 1 outward to retrieve the vena cava filter into the catheter, which can then be removed.
[0031] Reference Figure 1 In this embodiment, a first developing ring 8 is provided on the traction tube 1 on the side of the second traction ring 7 near the head end of the traction tube 1, and a second developing ring 9 is provided on the traction tube 1 on the side of the first traction ring 4 away from the head end of the traction tube 1. In actual use, the first developing ring 8 can be used to detect whether the retrieval hook has entered the traction tube 1; simultaneously, the second developing ring 9 can be used to detect whether the retrieval hook has fully entered the traction tube 1, thus determining whether the retrieval hook is in place, so as to implement subsequent tightening operations on the retrieval hook.
[0032] In reference Figure 1In this embodiment, the inner diameter of the head end of the traction tube 1 gradually decreases from the head end to the tail end. During the process of guiding the retrieval hook into the traction tube 1, if the retrieval hook is tilted, the tapered structure at the front end of the traction tube 1 can be used to gradually push the retrieval hook into the traction tube 1 by rotating the traction tube 1 and pushing it towards the front end, thus facilitating the retrieval hook's entry into the traction tube 1.
[0033] The implementation principle of the vena cava filter removal device in this application is as follows:
[0034] In use, the traction tube 1 is inserted into the guide tube to the position of the retrieval hook, and the entry depth of the retrieval hook is determined by the first developing ring 8 and the second developing ring 9 until the retrieval hook is completely inserted into the traction tube 1 from the front end. During this process, if the retrieval hook is tilted, the tapered opening structure at the front end of the traction tube 1 is used to gradually push the retrieval hook into the traction tube 1 by rotating the traction tube 1 and pushing it towards the front end.
[0035] Then, the first traction wire 2 and the second traction wire 5, which are connected together, are pulled backward. Under the action of the first traction wire 2 and the second traction wire 5, the first traction ring 4 moves upward along the first guide ring 3 and tightens, and the second traction ring 7 moves downward along the second guide ring 6 and tightens, so as to tighten the retrieval hook and fix the retrieval hook in the traction tube 1.
[0036] Next, secure the traction wire, keep the catheter stationary, and pull the traction tube 11 outwards to retrieve the vena cava filter back into the catheter, then remove it. During this process, because both traction rings are simultaneously hooked onto the retrieval hook during retrieval, even if the longitudinal force is insufficient when pulling the traction tube 1 outwards, at least one traction ring will always hook onto the retrieval hook as the retrieval hook and traction rings move, thus ensuring efficient retrieval.
[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A device for removing a vena cava filter, characterized in that: The device includes a traction tube (1) and a first traction assembly and a second traction assembly installed inside the traction tube (1). The first traction assembly includes a first traction wire (2), a first guide ring (3), and a first traction ring (4). One end of the first traction wire (2) is connected to the first traction ring (4), and the other end extends through the first guide ring (3) toward the rear end of the traction tube (1). The second traction assembly includes a second traction wire (5), a second guide ring (6), and a second traction ring (7). One end of the second traction wire (5) is connected to the second traction ring (7), and the other end extends through the second guide ring (6) toward the rear end of the traction tube (1). The second traction ring (7), the second guide ring (6), the first traction ring (4), and the first guide ring (3) are sequentially arranged on the inner wall of the traction tube (1) from the head end to the tail end. The second traction ring (7) is located near the head end of the traction tube (1). The center of the first guide ring (3), the center of the second guide ring (6), and the axis of the traction tube (1) are located in the same plane. The first traction ring (4) is bonded to the inner wall of the traction tube (1) circumferentially along the traction tube (1); The second traction ring (7) is bonded to the inner wall of the traction tube (1) circumferentially.
2. The vena cava filter removal device according to claim 1, characterized in that: The second traction ring (7) is provided with a first developing ring (8) on the traction tube (1) near the head end of the traction tube (1).
3. The vena cava filter removal device according to claim 1, characterized in that: A second developing ring (9) is provided on the traction tube (1) on the side of the first traction ring (4) away from the head end of the traction tube (1).
4. The vena cava filter removal device according to claim 1, characterized in that: The inner diameter of the head end of the traction tube (1) gradually decreases from the head end to the tail end.
5. The vena cava filter removal device according to claim 1, characterized in that: The tail ends of the first traction wire (2) and the second traction wire (5) are joined together to form a strand.