Vena cava filter capturing guide wire and device
By designing the vena cava filter capture guidewire and using the combined structure of the guidewire and block, the problem of difficulty in recycling tilted or embedded filters is solved, and the accurate positioning and smooth recycling of the filter are achieved.
Patent Information
- Application Number
- CN202510528289.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-24
- Publication Date
- 2025-08-01
AI Technical Summary
The existing vena cava filters are difficult to recover due to tilting or embedding. Especially when the filter central axis is at an angle greater than 15° to the central axis of the inferior vena cava segment, the recycling hook is close to or enters the wall, resulting in difficulty in removing it.
A vena cava filter capture guide wire is designed, including a guide wire and a barrier. The guide wire has variable diameter at both ends, is made of nickel-titanium wire and is coated with thermoplastic polyurethane elastomer. It is fixed to the barrier through the central hole of the filter and is used to pass through and abut against it. The filter is corrected and recovered in combination with a catheter and a recovery sheath.
The problem of recycling of tilted or embedded filters is effectively solved. Through the cooperation of the guide wire and the block, the filter position can be accurately positioned and corrected, and the smooth recycling can be achieved.
Smart Images
Figure CN120392370A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of medical devices, and particularly relates to a vena cava filter capture guide wire and device. Background Art
[0002] The implantation of a vena cava filter has been proven to effectively reduce the incidence of fatal pulmonary embolism (PE). However, with the increasing application, complications related to filter placement, such as filter-induced vena cava filter fracture, filter-induced abdominal pain due to perforation of the intravenous catheter (IVC) wall, low back pain, and adjacent organ injury, have received more attention. Currently, the filter recovery rate is not high. One of the reasons is that up to 40%-60% of the filters are difficult to recover due to tilting and embedding. The judgment criterion for filter tilting: the central axis of the filter forms an angle with the central axis of the vena cava segment where the filter is located, and the acute angle formed is the tilting angle. When the tilting angle ≥ 15°, the filter is considered tilted. When the tilting angle of the filter is large, it is easy to cause the retrieval hook to closely adhere to the vena cava wall or enter the wall, resulting in difficulty in retrieving the filter. Summary of the Invention
[0003] Therefore, the present invention aims to solve the problem that existing filters are difficult to recover due to tilting and embedding, and thus provides a vena cava filter capture guide wire and device.
[0004] To solve the above technical problems, the technical solution of the present invention is as follows:
[0005] On the one hand, the present invention provides a vena cava filter capture guide wire, including: a guide wire; a blocking block disposed on the outer peripheral wall of the guide wire and fixed relative to the guide wire, and the blocking block is used to abut against the central hole of the filter after the guide wire passes through the central hole of the filter.
[0006] Further, variable diameter segments are provided at both ends of the guide wire; the diameters of the variable diameter segments at both ends of the guide wire are different; the hardnesses of the variable diameter segments at both ends of the guide wire are different.
[0007] Further, the guide wire is a guide wire made of nitinol wire, and the diameter range of the guide wire is 0.5 mm - 1.8 mm; the surface of the guide wire is coated with a pipe made of thermoplastic polyurethane elastomer material.
[0008] Further, the vena cava filter capture guide wire further includes a connection structure; the guide wire includes a first guide wire and a second guide wire, and the first guide wire and the second guide wire are detachably connected through the connection structure.
[0009] Further, the connection structure includes a first external thread section and a first internal thread hole; the first external thread section is disposed at one end of the first guide wire close to the second guide wire; the first internal thread hole is disposed on the blocking block; the first guide wire and the blocking block are threadedly connected through the first external thread section and the first internal thread hole; the second guide wire is fixedly connected to the blocking block.
[0010] Further, the connection structure includes a clamping groove and a clamping member; the clamping groove is disposed at one end of the first guide wire close to the second guide wire; the clamping member is disposed on the blocking block; the first guide wire and the blocking block are connected through the clamping groove and the clamping member; the second guide wire is fixedly connected to the blocking block.
[0011] Further, the clamping groove is an annular groove disposed on the first guide wire; the clamping member is an open spring washer, a docking hole is disposed at one end of the blocking block close to the first guide wire, and the open spring washer is disposed in the docking hole; after the first guide wire extends into the docking hole, the annular groove is clamped with the open spring washer.
[0012] Further, the connection structure includes a second external thread section and a second internal thread hole; the blocking block includes a first blocking block and a second blocking block; the second internal thread hole is disposed on the first blocking block; the second external thread section is disposed on the second blocking block; the first blocking block and the second blocking block are connected through the second internal thread hole and the second external thread section; the first guide wire is fixedly connected to the first blocking block, and the second guide wire is fixedly connected to the second blocking block.
[0013] Further, the vena cava filter capture guide wire further includes a chuck; the chuck is disposed in the first blocking block, the chuck is a conical chuck, and the small end of the chuck faces away from the second blocking block; anti-slip protrusions are provided on the inner wall of the central hole of the chuck, and at least a part of the first guide wire extends into the central hole of the chuck.
[0014] On the other hand, the present invention also provides a vena cava filter capture device, including the vena cava filter capture guide wire according to any one of the above.
[0015] The technical solution of the present invention has the following advantages:
[0016] The vena cava filter capture guide wire provided by the present invention, when it is necessary to retrieve an inclined or incarcerated filter in the body, first establish two retrieval channels, namely the transjugular access and the transfemoral access. Then, a catheter or an adjustable catheter is delivered through the transfemoral access to the filter, and the catheter tip is aligned with the central hole of the filter retrieval hook. Then, the guide wire is first passed through the central hole of the filter through the catheter, and then the capture device is used to pull the guide wire out from the internal jugular vein through the jugular vein access until resistance is felt. At this time, the blocking block abuts against the central hole of the filter. Then, the retrieval sheath for capture is inserted into the blood vessel through the guide wire through the jugular vein until the retrieval sheath reaches the position of the filter retrieval hook. By pulling the guide wire, the filter can be corrected. If there is adhesion of the retrieval hook, the catheter can be pushed along the guide wire and the retrieval hook to strip the retrieval hook while retrieving the filter. When the filter completely enters the retrieval sheath, the retrieval sheath and the guide wire are withdrawn to complete the retrieval of the filter. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0018] Figure 1 Schematic diagram of the vena cava filter capture guide wire in the embodiment of the present invention;
[0019] Figure 2 Enlarged schematic diagram of the end of the guide wire in the vena cava filter capture guide wire in the embodiment of the present invention;
[0020] Figure 3 Schematic diagram of the vena cava filter capture guide wire in an embodiment of the present invention;
[0021] Figure 4 For Figure 3 Enlarged schematic diagram of the connection structure in
[0022] Figure 5 Schematic diagram of the vena cava filter capture guide wire in another embodiment of the present invention;
[0023] Figure 6 For Figure 5 Enlarged schematic diagram of the connection structure in
[0024] Figure 7 Schematic diagram of the vena cava filter capture guide wire in another embodiment of the present invention;
[0025] Figure 8 For Figure 7 Enlarged schematic diagram of the connection structure in
[0026] Figure 9 Schematic flow diagram of using the vena cava filter capture guide wire in the embodiment of the present invention to capture an umbrella filter
[0027] Figure 10 Schematic flow diagram of using the vena cava filter capture guide wire in the embodiment of the present invention to capture a fusiform filter
[0028] Explanation of reference numerals:
[0029] 1. Guide wire; 101. First guide wire; 102. Second guide wire; 2. Blocking block; 201. First blocking block; 202. Second blocking block; 3. Reducing section; 4. Pipe material; 5. First external thread section; 6. First internal thread hole; 7. Annular groove; 8. Split spring washer; 9. Docking hole; 10. Second external thread section; 11. Second internal thread hole; 12. Chuck; 13. Anti-slip protrusion; 14. Blood vessel; 15. Umbrella filter; 16. Fusiform filter; 17. Catheter; 18. Capturer; 19. Recovery sheath Detailed implementation manners
[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention
[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance
[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations
[0033] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0034] As Figure 1 shown, this embodiment provides a vena cava filter capture guide wire 1, including: a guide wire 1; a blocking block 2, which is arranged on the outer peripheral wall of the guide wire 1 and is fixed relative to the guide wire 1, and the blocking block 2 is used to abut against the central hole of the filter after the guide wire 1 passes through the central hole of the filter. For example, the blocking block 2 can be an elliptical or diamond-shaped structure with a through hole in the middle, which can be worn on the guide wire 1 and can be fixed in the middle 1 / 3 section of the guide wire 1 by pressing.
[0035] For the vena cava filter capture guide wire 1 provided in this embodiment, when it is necessary to retrieve an inclined or embedded filter in the body, first establish two retrieval channels, namely the transjugular channel and the transfemoral channel. Then, a catheter or an adjustable bending catheter is delivered through the transfemoral channel to the filter, and the catheter orifice is aligned with the central hole of the filter retrieval hook. Then, the guide wire 1 is first passed through the central hole of the filter through the catheter, and then the guide wire 1 is pulled out from the internal jugular vein through the internal jugular vein channel using a capture device until resistance is felt. At this time, the blocking block 2 abuts against the central hole of the filter. Then, a retrieval sheath for capture is inserted into the blood vessel through the guide wire 1 through the internal jugular vein until the retrieval sheath reaches the position of the filter retrieval hook. By pulling the guide wire 1, the filter can be corrected. If there is adhesion of the retrieval hook, the catheter can be pushed along the guide wire 1 and the retrieval hook to peel the retrieval hook while retrieving the filter. When the filter completely enters the retrieval sheath, the retrieval sheath and the guide wire 1 are withdrawn to complete the retrieval of the filter.
[0036] As Figure 2 shown, wherein, variable diameter sections 3 can be arranged at both ends of the guide wire 1. For example, the diameter of the variable diameter section 3 can gradually increase along the position close to the middle of the guide wire 1. For example, the length range of the variable diameter section 3 can be 10 mm - 200 mm; the diameters of the variable diameter sections 3 at both ends of the guide wire 1 are different; the hardnesses of the variable diameter sections 3 at both ends of the guide wire 1 are different.
[0037] Among them, the guide wire 1 can be a guide wire 1 made of nitinol wire, and the diameter range of the guide wire 1 can be 0.5 mm - 1.8 mm; the surface of the guide wire 1 can be coated with a pipe 4 made of thermoplastic polyurethane elastomer (TPU).
[0038] Among them, the vena cava filter capture guide wire 1 further includes a connection structure; the guide wire 1 includes a first guide wire 101 and a second guide wire 102, and the first guide wire 101 and the second guide wire 102 are detachably connected through the connection structure. With such a setting, the guide wire 1 is divided into two parts, the first guide wire 101 and the second guide wire 102. Such a split structure can use a thinner catheter during the operation. Because, if the guide wire is not split, the inner diameter of the catheter must be greater than the outer diameter of the blocking block. After the guide wire is set as a split structure, the inner diameter of the catheter only needs to be greater than the outer diameter of the guide wire. When the guide wire reaches a certain position during the operation, the catheter can be withdrawn, the guide wire with the blocking block is connected, and the operation can be continued.
[0039] Such as Figure 3 , Figure 4 As shown, in one embodiment, the connection structure includes a first external thread section 5 and a first internal thread hole 6; the first external thread section 5 is arranged at one end of the first guide wire 101 close to the second guide wire 102; the first internal thread hole 6 is arranged on the blocking block 2; the first guide wire 101 and the blocking block 2 are threadedly connected through the first external thread section 5 and the first internal thread hole 6; the second guide wire 102 is fixedly connected to the blocking block 2.
[0040] For example, the main body of the first guide wire 101 can be a nitinol wire, and the diameter range can be 0.5mm - 1.8mm. One end is a reduced diameter section 3, and the other end is a first external thread section 5. Except for the first external thread section 5, the rest of the first guide wire 101 is coated with a TPU tube. For example, the main body of the second guide wire 102 is a nitinol wire, and the diameter range can be 0.5mm - 1.8mm. One end is a reduced diameter section 3, and the other end is connected to the blocking block 2. Except for the part of the blocking block 2, the second guide wire 102 is coated with a TPU tube. For example, the blocking block 2 can be a conical structure or an elliptical structure. A part of the blocking block 2 is a through hole, and a part is a first internal thread hole 6. The through hole part can be firmly fixed to the second guide wire 102 by welding, bonding, etc. The first internal thread hole 6 part can be threadedly engaged with the first guide wire 101 during use and used after assembly.
[0041] Such as Figure 5 , Figure 6 As shown, in one embodiment, the connection structure includes a card slot and a clamping member; the card slot is arranged at one end of the first guide wire 101 close to the second guide wire 102; the clamping member is arranged on the blocking block 2; the first guide wire 101 and the blocking block 2 are connected through the card slot and the clamping member; the second guide wire 102 is fixedly connected to the blocking block 2.
[0042] Among them, the card slot is an annular groove 7 provided on the first guide wire 101; the clamping member is an open spring washer 8, a docking hole 9 is provided at one end of the blocking block 2 close to the first guide wire 101, and the open spring washer 8 is arranged in the docking hole 9; after the first guide wire 101 extends into the docking hole 9, the annular groove 7 is clamped with the open spring washer 8.
[0043] For example, the main body of the first guide wire 101 can be a nitinol wire, and the diameter range can be 0.5 mm - 1.8 mm. One end is a reduced-diameter section 3, and the other end is provided with an annular groove. Except for the head end part of the annular groove of the first guide wire 101, the rest is coated with a TPU tube. For example, the main body of the second guide wire 102 can be a nitinol wire, and the diameter range can be 0.5 mm - 1.8 mm. One end is a reduced-diameter section 3, and the other end is connected to the blocking block 2. Except for the part of the blocking block 2 of the second guide wire 102, the rest is coated with a TPU tube. For example, the blocking block 2 can be a conical structure or an elliptical structure, and is composed of a blocking block 2 main body and an open spring gasket. A docking hole 9 is designed on the blocking block 2, and a receiving groove can be designed in the docking hole 9 for installing the open spring washer 8. The other end and the second guide wire 102 can be firmly fixed by welding, bonding, etc. The first guide wire 101 and the second guide wire 102 are used after being assembled through the annular groove 7 and the open spring washer 8.
[0044] Such as Figure 7 、 Figure 8 As shown, in one embodiment, the connection structure includes a second external thread section 10 and a second internal thread hole 11; the blocking block 2 includes a first blocking block 201 and a second blocking block 202; the second internal thread hole 11 is provided on the first blocking block 201; the second external thread section 10 is provided on the second blocking block 202; the first blocking block 201 and the second blocking block 202 are connected through the second internal thread hole 11 and the second external thread section 10; the first guide wire 101 is fixedly connected to the first blocking block 201, and the second guide wire 102 is fixedly connected to the second blocking block 202.
[0045] Among them, the vena cava filter capture guide wire 1 further includes a chuck 12; the chuck 12 is arranged in the first blocking block 201, the chuck 12 is a conical chuck 12, and the small-mouth end of the chuck 12 faces away from the second blocking block 202; anti-slip protrusions 13 are arranged on the inner wall of the central hole of the chuck 12, and at least part of the first guide wire 101 extends into the central hole of the chuck 12.
[0046] For example, the main body of the first guide wire 101 can be a nitinol wire, and the diameter range can be 0.5 mm - 1.8 mm. One end of it is a reduced-diameter section 3. A certain length of the non-reduced-diameter section 3 of the first guide wire 101 is exposed, for example, 1 mm - 10 mm, and the rest is coated with a TPU tube. For example, the main body of the second guide wire 102 can be a nitinol wire, and the diameter range can be 0.5 mm - 1.8 mm. One end of it is a reduced-diameter section 3, and the other end is connected to the blocking block 2. The second guide wire 102 is coated with a TPU tube except for the part of the blocking block 2. For example, the blocking block 2 is a conical structure or an elliptical structure, and is divided into a first blocking block 201 and a second blocking block 202. The first blocking block 201 can be a hollow structure and has a second internal threaded hole 11; one end of the second blocking block 202 close to the first blocking block 201 is provided with a second external threaded section 10, and the second blocking block 202 is also provided with a through hole that can be welded or press-gripped and fixed to the second guide wire 102. At the same time, a conical chuck 12 can be arranged inside the first blocking block 201. There is a central hole in the middle of the chuck 12, through which the first guide wire 101 can pass. The inner wall of the central hole of the chuck 12 can be provided with anti-slip protrusions 13 such as rectangles or triangles to increase the friction force and prevent the first guide wire 101 from slipping out.
[0047] Another embodiment also provides a vena cava filter capture device, including the vena cava filter capture guide wire 1 described in any one of the above, and the vena cava filter capture device further includes a catheter 17 or an adjustable bending catheter, a capture device 18, and a retrieval sheath 19.
[0048] As Figure 9 、 Figure 10 shown, the using steps are as follows:
[0049] 1. Establish a vena cava filter retrieval path, including a transjugular path and a transfemoral path;
[0050] 2. Deliver the catheter 17 or the adjustable bending catheter through the transfemoral path to the umbrella filter 15 or the fusiform filter 16, and align the catheter orifice with the central hole of the filter retrieval hook;
[0051] 3. Pass the capture guide wire 1 through the catheter 17 until it passes through the central hole of the filter retrieval hook;
[0052] 4. Use the capture device 18 to pull the capture guide wire 1 out through the jugular vein through the jugular vein until resistance is felt and the blocking block 2 reaches the position of the filter retrieval hook;
[0053] 5. Insert the retrieval sheath 19 through the guide wire 1 into the blood vessel 14 through the jugular vein until the retrieval sheath reaches the position of the retrieval hook. Pulling the guide wire 1 can correct the filter. If there is adhesion of the retrieval hook, the catheter 17 can be pushed along the guide wire 1 and the retrieval hook to peel the retrieval hook while retrieving the filter. When the filter completely enters the retrieval sheath 19, withdraw the retrieval sheath 19 and the guide wire 1 to complete the filter retrieval.
[0054] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or alterations derived therefrom still fall within the protection scope of the present invention.
Claims
1. A vena cava filter capture guide wire, characterized in that, Comprising: A guide wire (1); A blocking block (2), arranged on the outer peripheral wall of the guide wire (1) and fixed relative to the guide wire (1), and the blocking block (2) is used to abut against the central hole of the filter after the guide wire (1) passes through the central hole of the filter.
2. The vena cava filter capture guide wire according to claim 1, characterized in that Variable diameter segments (3) are arranged at both ends of the guide wire (1); The variable diameter segments (3) at both ends of the guide wire (1) have different diameters; The variable diameter segments (3) at both ends of the guide wire (1) have different hardnesses.
3. The vena cava filter capture guide wire according to claim 1, characterized in that The guide wire (1) is a guide wire (1) made of nitinol wire, and the diameter range of the guide wire (1) is 0.5 mm - 1.8 mm; A pipe (4) made of thermoplastic polyurethane elastomer is coated on the surface of the guide wire (1).
4. The vena cava filter capture guide wire according to any one of claims 1-3, characterized in that, It further comprises a connection structure; The guide wire (1) comprises a first guide wire (101) and a second guide wire (102), and the first guide wire (101) and the second guide wire (102) are detachably connected through the connection structure.
5. The vena cava filter capture guide wire according to claim 4, characterized in that The connection structure comprises a first external thread segment (5) and a first internal thread hole (6); The first external thread segment (5) is arranged at one end of the first guide wire (101) close to the second guide wire (102); The first internal thread hole (6) is arranged on the blocking block (2); The first guide wire (101) and the blocking block (2) are threadedly connected through the first external thread segment (5) and the first internal thread hole (6); The second guide wire (102) is fixedly connected to the blocking block (2).
6. The vena cava filter capture guide wire according to claim 4, characterized in that The connection structure comprises a clamping groove and a clamping member; The clamping groove is arranged at one end of the first guide wire (101) close to the second guide wire (102); The clamping member is arranged on the blocking block (2); The first guide wire (101) and the blocking block (2) are connected through the clamping groove and the clamping member; The second guide wire (102) is fixedly connected to the blocking block (2).
7. The vena cava filter capture guide wire according to claim 6, characterized in that The clamping groove is an annular groove (7) arranged on the first guide wire (101); The clamping member is an open spring washer (8), a docking hole (9) is arranged at one end of the blocking block (2) close to the first guide wire (101), and the open spring washer (8) is arranged in the docking hole (9); After the first guide wire (101) extends into the docking hole (9), the annular groove (7) is clamped with the open spring washer (8).
8. The vena cava filter capture guide wire according to claim 4, characterized in that The connection structure comprises a second external thread segment (10) and a second internal thread hole (11); The blocking block (2) comprises a first blocking block (201) and a second blocking block (202); The second internal thread hole (11) is provided on the first blocking block (201); The second external thread section (10) is provided on the second blocking block (202); The first blocking block (201) and the second blocking block (202) are connected through the second internal thread hole (11) and the second external thread section (10); The first guide wire (101) is fixedly connected to the first blocking block (201), and the second guide wire (102) is fixedly connected to the second blocking block (202).
9. The vena cava filter capture guide wire according to claim 8, characterized in that It further includes a chuck (12); The chuck (12) is arranged inside the first blocking block (201), the chuck (12) is a conical chuck (12), and the small end of the chuck (12) is arranged away from the second blocking block (202); Anti-slip protrusions (13) are arranged on the inner wall of the central hole of the chuck (12), and at least part of the first guide wire (101) extends into the central hole of the chuck (12).
10. A vena cava filter capturing device, characterized in that, It includes the vena cava filter capture guide wire (1) according to any one of claims 1-9.
Citation Information
Cited By
Method and device for taking out inferior vena cava filter
CN121943517A