Vena cava filter recovery device
By designing the combination of the curved sheath and the recovery sheath, the problems of offset and adhesion during the recycling of the inferior vena cava filter are solved, and the accurate recycling of the filter is achieved and the risk of complications is reduced.
Patent Information
- Application Number
- CN202411301317.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2024-12-13
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the prior art, the inferior vena cava filter is prone to difficulty in recycling due to deviation or adhesion during use, and cannot effectively oriented hooks to remove or remove adhesions, resulting in some filters remaining in the patient's body forever, increasing the risk of complications.
A vena cava filter recycling device is designed, including a bent sheath tube, a recycling snail and a recycling sheath tube. The accurate snail and positioning of the filter is achieved through the bent control assembly and anchor balloon, and the adhesion is cut and separated by the slope structure. Ensure the smooth recycling of the filter.
Accurate and rapid recycling of offset or adhesion filters is achieved, reducing the occurrence of complications in patients, improving the recovery success rate, and avoiding the risk of filters permanently staying in the body.
Smart Images
Figure CN119112431A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of medical devices, in particular to a vena cava filter recovery device. Background Art
[0002] The use of inferior vena cava filters can prevent the occurrence of fatal pulmonary embolism to the greatest extent. During clinical treatment, according to the current guidelines and consensus, the filters currently placed are basically temporary filters, and all temporary filters are recommended to be removed at an appropriate time. In the prior art, the inferior vena cava filter is generally taken out by clamping the retrieval hook on the inferior vena cava filter with a basket wire loop. During use, the head of the rope of the loop is a soft rope body. During the snaring process, the rope body not only needs to accurately set the retrieval hook, but also needs to prevent the rope head from falling out of the retrieval hook when pulling and clamping. The filter in the middle position can be snare and taken out relatively smoothly, but the filter with position deviation, retrieval hook adhesion or body adhesion becomes relatively difficult to be separated from the inferior vena cava during the retrieval process, or even cannot be taken out, so that it needs to be permanently placed in the human body. For such difficult filters, the modified pigtail catheter-assisted wire retrieval technology (LOOP technology) is often used to correct the filter deviation or filter retrieval hook embedding, or the traditional retrieval sheath is used to cut the adhesion filter, etc., which increases the recovery rate of difficult filters. However, there is still no relevant recovery equipment for difficult filters, so some filters remain in the patient's body permanently, which greatly increases the occurrence of complications related to the inferior vena cava filter in patients.
[0003] In general, the prior art has the following defects: 1. For the displaced filter, it is impossible to hook and recover it in a directional manner. For the filter embedded in the recovery hook, it is impossible to implement the LOOP technology to correct the recovery hook and release the filter deviation state; 2. For the filter with obvious adhesion, the current recovery sheath does not have the function of cutting and separating the adhesion, and it is difficult to effectively release the adhesion part of the filter. In view of the above problems, the present application is proposed. Summary of the invention
[0004] The purpose of the present invention is to provide a vena cava filter recovery device to solve the problems that a deviated filter is difficult to be retrieved by a directional hook, a filter embedded in a retrieval hook cannot correct the retrieval hook by itself, and it is difficult to effectively remove the adhesion of the filter.
[0005] The present invention is achieved through the following technical solutions.
[0006] A vena cava filter recovery device of the present invention comprises a bending sheath, a recovery snare and a recovery sheath, wherein the bending sheath comprises a bending sheath body and a bending control assembly, wherein the bending sheath body is provided with a pointing portion near the patient end, wherein the bending control assembly comprises a pulling wire, wherein the pulling wire is connected to the pointing portion, and the bending of the pointing portion is controlled by the pulling wire, wherein the annular snare in the recovery snare can extend in the bending sheath body toward the patient end for recovery, wherein the recovery sheath is sleeved on the bending sheath body, and the patient end of the recovery sheath is provided with a slope structure for assisting stripping, and an anchoring balloon is installed on the recovery sheath, wherein the anchoring balloon is generally cylindrical after expansion and can be fixed in a blood vessel to center the recovery sheath and ensure the controllability of the bending sheath.
[0007] Furthermore, the vena cava filter recovery device also includes an airbag sealing component, which includes an elastic sac, which is arranged on the outside of the bending sheath tube body. After the elastic sac is expanded, it squeezes and seals the bending sheath tube body.
[0008] Furthermore, the elastic capsule is an annular capsule composed of a multi-valve balloon, preferably a three-valve balloon.
[0009] Furthermore, the bending adjustment control assembly also includes a bending adjustment reel, and the pulling wire is connected to the bending adjustment reel.
[0010] Furthermore, a U-shaped bending wrench is connected to the bending adjustment reel.
[0011] Furthermore, at least two groups of pulling wires are provided.
[0012] Furthermore, the pointing portion is provided with a plurality of slits arranged along the axial direction and the circumferential direction thereof, and the slits are arranged to facilitate bending adjustment of the pointing portion.
[0013] Furthermore, a limiting groove is provided between adjacent slits, and the pulling wire is passed through an outer wall of the limiting groove and an inner wall of the tube body of the pointing portion, and the limiting groove has the function of limiting the pulling wire in circumferential and radial directions.
[0014] Furthermore, a straight section is provided on the bending sheath tube body at the end of the pointing portion, and the straight section is used to ensure smooth recovery of the filter and reduce the risk of the filter scratching the sheath tube.
[0015] Furthermore, the bending adjustment sheath tube body includes an inner polymer lubricating layer, a spiral skeleton and an outer polymer lubricating layer which are arranged in sequence from the inside to the outside. The spiral skeleton is generally made of metal and has a cylindrical shape. The spiral gap is less than 3 mm. The cylindrical spiral skeleton is designed as a short-pitch spring structure, which can take into account the axial support and flexibility of the bending adjustment sheath tube. The pulling wire is passed between the inner polymer lubricating layer and the cylindrical metal spiral skeleton, or the pulling wire is passed between the cylindrical metal spiral skeleton and the outer polymer lubricating layer.
[0016] Furthermore, the slope structure is a ring body whose hardness is greater than that of the recovery sheath tube, and the material may be metal or polymer material.
[0017] Furthermore, the slope structure is block-shaped, and a plurality of the slope structures are arranged along the circumference of the recovery sheath tube.
[0018] Beneficial effects of the present invention:
[0019] In the process of retrieving the filter by using the annular snare, the pointing part is bent by the bending control component, so that the annular snare can accurately and quickly snare the filter regardless of whether the filter is in the center position or offset, and the recovery hook can be corrected by controlling the bending degree during the recovery process; in the case of obvious filter adhesion, the slope structure of the recovery sheath can be used to cut and separate the filter from the surrounding tissue, effectively release the adhesion of the filter, and smoothly recover the filter. In addition, an anchoring balloon is also provided in the present scheme, which can be fixed in the blood vessel after expansion, so that the recovery sheath is centered and the controllability of the bending sheath is ensured. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0022] Figure 1 It is a schematic diagram of the structure of the bending sheath tube and the recovery sheath tube;
[0023] Figure 2 It is a schematic diagram of the structure of the recovery snare;
[0024] Figure 3 This is a schematic diagram of the connection between the bending reel and the pulling wire;
[0025] Figure 4 Schematic diagram of the pointing part structure;
[0026] Figure 5 is a schematic diagram of the cross-sectional structure of the elastic bladder;
[0027] Figure 6 is a schematic diagram of the structure of the anchoring balloon;
[0028] Figure 7 This is a schematic diagram of the structure of the operating end of the bending sheath tube;
[0029] Figure 8 It is a cross-sectional schematic diagram of the bending sheath tube body;
[0030] Fig. 9 for Figure 1 Schematic diagram of the structure at B in the middle;
[0031] Fig.10 It is an enlarged schematic diagram of the slope structure;
[0032] Fig.11 It is an enlarged schematic diagram of the cutting seam and the limiting groove. DETAILED DESCRIPTION
[0033] Combine the following Figure 1-11 The present invention is described in detail.
[0034] A vena cava filter recovery device of the present invention comprises a bending sheath 1200 , a recovery snare 1100 and a recovery sheath 1300 .
[0035] like Figure 1 The bending sheath 1200 includes a bending sheath body 1220 and a bending control assembly 1210. The patient end of the bending sheath body 1220 is provided with a pointing portion 1230 and a straight segment 1236, wherein the straight segment 1236 is used to ensure smooth filter recovery and reduce the risk of the filter scratching the sheath. The pointing portion 1230 is used to achieve a bending effect. The bending of the pointing portion 1230 is achieved by the retraction and extension of the pulling wire 1240. The pointing portion 1230 can be set to a structure that can be bent, such as a snake bone structure. In this embodiment, Figure 4 The pointing portion 1230 is provided with a plurality of slits 1231 arranged along its axial direction. Preferably, the pointing portion 1230 is also provided with a plurality of slits 1231 distributed in the circumferential direction. Generally, two groups are arranged in the circumferential direction. The slits 1231 are arranged to facilitate the bending adjustment of the pointing portion 1230. The slits 1231 penetrate through the tube wall. A limiting groove 1232 recessed toward the center of the tube body is provided between two adjacent slits 1231. The limiting groove 1232 has the function of limiting the pulling wire 1240 in the circumferential and radial directions. The pulling wire 1240 is passed between the outer wall of the limiting groove 1232 and the inner wall 1233 of the pointing tube body. A pulling wire connecting portion 1250 is provided at the distal end of the pointing portion 1230 for being fixedly connected to the pulling wire 1240.
[0036] The bending sheath tube body 1220 is connected to the flushing port 1002 .
[0037] Preferably, if Figure 8 , 9 The bending sheath body 1220 includes an inner polymer lubricating layer 1222, a spiral skeleton 1221 and an outer polymer lubricating layer 1223 which are arranged in sequence from the inside to the outside. The spiral skeleton 1221 is generally made of metal and has a cylindrical shape. The spiral gap is less than 3 mm. The cylindrical spiral skeleton 1221 is designed as a short-pitch spring structure, which can take into account the axial support and flexibility of the bending sheath 1200. The pulling wire 1240 is passed between the inner polymer lubricating layer 1222 and the cylindrical metal spiral skeleton 1221, or the pulling wire 1240 is passed between the cylindrical metal spiral skeleton 1221 and the outer polymer lubricating layer 1223.
[0038] In this embodiment, two pulling wires 1240 are provided. In other embodiments, other numbers of pulling wires 1240 may be provided according to adjustment requirements.
[0039] Alternatively, if Fig.11 The distance between the inner wall 1234 of the limiting groove and the inner wall 1235 of the pointing tube body is less than 3 mm, and the axial width of the limiting groove 1232 is greater than the axial width of the pointing tube body slit 1231.
[0040] The recovery sheath tube 1300 is sleeved on the outer peripheral surface of the bending sheath tube body 1220. Fig.10 The distal end (patient end) of the recovery sheath 1300 is provided with a slope structure 1310 for assisting peeling, forming a blade-like structure for cutting adhesions. The slope structure 1310 is used for peeling / separating the filter pin from the thrombus / vascular tissue.
[0041] The slope structure 1310 is made of a material with a hardness greater than that of the adhesion separation recovery sheath tube body 1320 . Optionally, the slope structure 13 can be set as a ring body or a block, and several of them are set along the circumference of the recovery sheath tube 1300 .
[0042] like Figure 3 , Figure 7The bending control assembly 1210 includes a pulling wire 1240, which is connected to the pointing portion 1230. The bending of the pointing portion 1230 is controlled by the pulling wire 1240. The annular snare 1130 in the recovery snare 1100 can be extended toward the patient end in the bending sheath tube body 1220 for recovery. It also includes a bending reel 1212, a channel sealing body 1213 and a bending wrench 1211. The bending wrench 1211 can be set to a U shape, and the distal end of the channel sealing body 1213 is sleeved on the bending sheath tube body. On the outer peripheral surface of the proximal section 1220, the bending adjustment reel 1212 is installed in the channel sealing body 1213, the bending adjustment wrench 1211 is connected to the bending adjustment reel 1212, and the pulling wire 1240 is connected to the bending adjustment reel 1212. Optionally, the proximal end 1216 (operating end) of the channel sealing cavity 1213 is provided with an elastic sealing sheet, and after the elastic sealing sheet is opened, the annular snare 1130 can be inserted into the bending adjustment sheath tube body 1220 through this, and the bending adjustment control assembly 1210 can realize bidirectional or multi-directional adjustment of the pointing part 1230.
[0043] The vena cava filter retrieval device also includes a balloon sealing assembly 1400, such as Figure 1 , 7 The airbag sealing assembly 1400 is arranged at the proximal end of the bending sheath body 1220. The airbag sealing assembly 1400 includes a sealing shell 1410 that is in close contact with the outer peripheral surface of the proximal end of the bending sheath body 1220, an annular elastic sac body 1420 arranged in the sealing shell, and a filling cavity 1430 connected to the annular elastic sac body. The filling cavity 1430 is connected to the valve port 1001. The airbag sealing assembly 1400 has a better sealing effect for the simultaneous use of multiple capture catheters or guide wires. After multiple catheters / guide wires enter the bending sheath body 1220, the elastic sac body expands to squeeze and seal the bending sheath body 1220 to avoid bleeding problems.
[0044] Preferably, if Figure 5 The elastic balloon body 1420 is an annular balloon body composed of a multi-petal balloon. In this embodiment, a three-petal balloon is used, which is divided into balloon 1423, balloon 1421 and balloon 1422. The three-petal balloon has a better extrusion sealing effect.
[0045] like Figure 1 The recovery sheath 1300 is provided with an anchoring balloon 1500, which can be fixed in the blood vessel after expansion, so that the recovery sheath 1300 is centrally positioned to ensure the controllability of the bending sheath 1200. Specifically, Figure 6The anchoring balloon 1500 is provided with a channel 1501 for the recovery sheath 1300 to pass through. The anchoring balloon 1500 can be filled with liquid or gas, preferably liquid, such as contrast fluid or saline. The filling channel is extended in the adjustable sheath body 1220 or the recovery sheath 1300. After being filled with liquid, the cylindrical surface of the anchoring balloon is centrally positioned to ensure the controllability of the adjustable sheath.
[0046] like Figure 2 The recovery snare 1100 includes an annular snare 1130 connected to the distal end of a slender recovery control assembly 1120. Specifically, the recovery control assembly 1120 includes an elongated core shaft 1121, a push head 1122 fixedly connected to the proximal end of the elongated core shaft 1121, and a snare catheter 1124 having a Y-shaped hemostatic valve 1123 connected to the proximal end; the elongated core shaft 1121 is fixedly connected to the annular snare 1130 at the distal end, and the elongated core shaft 1121 is inserted into the lumen of the snare catheter 1124 through the Y-shaped hemostatic valve 1123, and the elongated core shaft 1121 can move freely in the lumen of the bending sheath 1200.
[0047] In the process of using the annular snare 1130 to recover the filter, the pointing part 1230 is bent by the bending control component 1210, so that the annular snare 1130 can accurately and quickly snare the filter regardless of whether the filter is in the center position or the position is offset. In addition, in the case of obvious filter adhesion, the slope structure 1310 of the recovery sheath 1300 can be used to cut and separate the filter and the surrounding tissue, effectively release the adhesion of the filter, and smoothly recover the filter. In addition, an anchoring balloon 1500 is also provided in the present solution. After the anchoring balloon 1500 is expanded, it can be fixed in the blood vessel, so that the recovery sheath 1300 is centered and the controllability of the bending sheath 1200 is ensured. In addition, the three-petal balloon in the present solution has a better extrusion sealing effect. After the multiple catheters / guidewires enter the bending sheath body 1220, the elastic balloon expands to squeeze and seal the bending sheath body 1220 to avoid bleeding problems.
[0048] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology in this field to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.
Claims
1. A vena cava filter recovery device, characterized in that: The invention comprises a bending adjustment sheath tube (1200) and a recovery sheath tube (1300), wherein the bending adjustment sheath tube (1200) comprises a bending adjustment sheath tube body (1220) and a bending adjustment control assembly (1210), wherein the bending adjustment sheath tube body (1220) is provided with a pointing portion (1230), and the bending adjustment control assembly (1210) comprises a pulling wire (1240), wherein the pulling wire (1240) is connected to the pointing portion (1230), and the bending of the pointing portion (1230) is controlled by the pulling wire (1240), so that the annular snare in the recovery snare can be recovered. The retrieval sheath (1300) is capable of extending toward the patient end in the bending adjustment sheath tube body (1220) to perform retrieval work. The retrieval sheath (1300) is sleeved on the bending adjustment sheath tube body (1220). The patient end of the retrieval sheath (1300) is provided with a slope structure (1310) for assisting stripping. The retrieval sheath (1300) is installed with an anchoring balloon (1500). After expansion, the anchoring balloon (1500) can be fixed in the blood vessel, so that the retrieval sheath (1300) is centrally positioned, thereby ensuring the controllability of the bending adjustment sheath (1200).
2. The vena cava filter recovery device according to claim 1, characterized in that: The vena cava filter recovery device also includes an airbag sealing component (1400), wherein the airbag sealing component (1400) includes an elastic sac, which is arranged on the outside of the bending sheath tube body (1220). After the elastic sac is expanded, it squeezes and seals the bending sheath tube body (1220).
3. The vena cava filter recovery device according to claim 2, characterized in that: The elastic capsule is an annular capsule composed of a multi-petal balloon.
4. The vena cava filter recovery device according to any one of claims 1 to 3, characterized in that: The bending adjustment control assembly (1210) further comprises a bending adjustment reel (1212), and the pulling wire (1240) is connected to the bending adjustment reel (1212).
5. The vena cava filter recovery device according to claim 4, characterized in that: The pulling wires (1240) are provided in at least two groups.
6. The vena cava filter recovery device according to claim 5, characterized in that: The pointing portion (1230) is provided with a plurality of slits (1231) arranged along its axial direction and circumferential direction, and the slits (1231) are provided to facilitate bending adjustment of the pointing portion (1230).
7. The vena cava filter recovery device according to claim 6, characterized in that: A limiting groove (1232) is provided between adjacent slits (1231), and the pulling wire (1240) is passed between the outer wall of the limiting groove (1232) and the inner wall of the tube body of the pointing portion (1230). The limiting groove (1232) has the function of limiting the pulling wire (1240) in the circumferential and radial directions.
8. The vena cava filter recovery device according to any one of claims 5 to 7, characterized in that: A straight line segment (1236) is provided on the bending adjustment sheath tube body (1220) at the end of the pointing portion (1230).
9. The vena cava filter recovery device according to claim 8, characterized in that: The bending adjustment sheath tube body (1220) comprises an inner polymer lubricating layer (1222), a metal spiral skeleton (1221), and an outer polymer lubricating layer (1223) which are arranged in sequence from the inside to the outside.
10. The vena cava filter recovery device according to claim 1 or 9, characterized in that: The slope structure (1310) is a ring body having a harderness than that of the recovery sheath tube (1300).