A core wire connection structure and a locking guide wire structure

Abstract

This utility model discloses a core wire connection structure and a locking guide wire structure, belonging to the field of medical device technology. The core wire connection structure includes a limiting part, a traction part, and a core wire. The limiting part includes a curved support section and an annular structure, with the annular structure connected to the distal end of the curved support section. The traction part is connected to the proximal end of the curved support section. The proximal end of the core wire is connected to the traction part, and the distal end of the core wire passes through the annular structure. The distal end of the core wire is used to connect to an expandable winding wire. This utility model utilizes the annular structure of the limiting part to define the position of the core wire, allowing the core wire to be supported by the curved support section of the limiting part. This avoids the connection point breaking due to an excessively large angle between the core wire and the traction part, thereby improving surgical safety and operational reliability.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a core wire connection structure and a locking guide wire structure. Background Technology

[0002] Since Professor Furman's invention of a novel endocardial pacemaker electrode in 1963, transvenous electrode lead implantation has become a core method for implanting cardiac electronic devices (CIEDs, including pacemakers, ICDs, and CRTs) and is widely used in clinical practice. With the increasing prevalence of CIEDs, the number of implanted electrode leads and their usage time have significantly increased. However, leads are not permanent devices, and in cases of complications such as pocket infection, electrode-related systemic infection, lead breakage, or thrombosis, they must be removed via transvenous electrode lead removal.

[0003] Early removal techniques mainly rely on direct traction (manual or pulley traction). However, since long-term implanted leads are often tightly wrapped by fibrous tissue and adhere to the blood vessel wall, endocardium, and valve structure, direct traction can easily lead to serious complications such as lead breakage, myocardial tissue damage, or even blood vessel tearing. The success rate is low and the risk is extremely high.

[0004] To overcome the aforementioned shortcomings, locking guidewire (locking wire) technology emerged, becoming a key foundation for modern transvenous catheter removal. This device uses an expandable distal structure inserted into the catheter lumen to achieve mechanical locking, thereby establishing overall traction force and supporting axially controllable traction, significantly improving the success rate and safety of removal.

[0005] However, existing locking guidewires still have certain limitations in practical operation: the expanded guidewire at its tip needs to be locked at the farthest end of the guidewire lumen, while the external traction direction and the internal core wire are often out of axis. When the traction is at a certain angle, the core wire is prone to breakage due to non-axial stress, causing the distal expanded portion to separate from the external traction cable. This problem not only reduces surgical efficiency and delays the operation process, but may also cause serious consequences such as instrument residue, tissue damage, and even endanger the patient's life.

[0006] Therefore, there is an urgent need for a structurally optimized locking guidewire to improve surgical safety and operational reliability. Utility Model Content

[0007] The purpose of this invention is to provide a core wire connection structure and a locking guide wire structure to solve the problems existing in the prior art. By using the annular structure of the limiting part to limit the position of the core wire, the core wire can be supported by the bending support section of the limiting part, avoiding the situation where the connection part breaks due to the excessive angle between the core wire and the traction part, thereby improving surgical safety and operational reliability.

[0008] To achieve the above objectives, this utility model provides the following solution: This utility model provides a core wire connection structure, including a limiting part, a traction part, and a core wire. The limiting part includes a bending support section and an annular structure. The annular structure is connected to the distal end of the bending support section. The traction part is connected to the proximal end of the bending support section. The proximal end of the core wire is connected to the traction part, and the distal end of the core wire passes through the annular structure. The distal end of the core wire is used to connect to an expandable winding wire.

[0009] In one embodiment, the limiting part is formed by winding a limiting steel wire, and the annular structure is a circular ring, an elliptical ring, or a rhomboid ring.

[0010] In one embodiment, the diameter of the limiting steel wire is 0.3mm to 0.6mm.

[0011] In one embodiment, the traction part is a fixed tube, the limiting steel wire passes through the fixed tube, and the limiting steel wire is welded to both ends of the fixed tube.

[0012] In one embodiment, the core wire is connected to the fixing tube by bonding or welding.

[0013] This utility model provides a locking guide wire structure, including an expandable winding wire, a firing structure, and a core wire connection structure as described above. The proximal end of the expandable winding wire is wound and sleeved on the core wire. The firing structure is used to push the expandable winding wire to expand the expandable winding wire and lock the electrode wire.

[0014] In one embodiment, the firing mechanism includes a sleeve and a handle tube. The sleeve is fitted onto the core wire, the distal end of the sleeve is used to abut against the proximal end of the expandable winding wire, and the distal end of the handle tube is connected to the proximal end of the sleeve, the handle tube being used to push the sleeve to move.

[0015] In one embodiment, the annular structure is used to be inserted into the interior of the handle tube after compression, and there is friction between the annular structure and the handle tube.

[0016] In one embodiment, a knotting loop is also included, which is connected to the distal end of the handle tube.

[0017] In one embodiment, the expandable winding adopts a multi-helix winding structure, which includes at least two sets of windings arranged side by side. The turns of the windings are tightly fitted together in the starting and ending sections of the multi-helix winding structure, and there is an axial spacing between the turns of the windings in the middle section of the multi-helix winding structure.

[0018] The present invention achieves the following technical advantages over the prior art: This invention utilizes the annular structure of the limiting part to define the position of the mandrel, allowing the mandrel to be supported by the bending support section of the limiting part. This reduces the relative positional variation between the mandrel and the traction part, ensuring that the mandrel mainly bears axial stress. It also avoids the situation where the connection part breaks due to an excessively large angle between the mandrel and the traction part, thereby improving surgical safety and operational reliability.

[0019] Other technical solutions included in this utility model can also achieve the following technical effects: This invention inserts the ring structure into the handle tube after compression, so that the ring structure can limit and constrain the position of the handle tube, avoiding the situation where the operator accidentally triggers the inner cavity of the locking electrode wire when the expandable winding wire has not reached the predetermined locking position, thus improving the safety and convenience of the operation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall locking guidewire structure in an embodiment of the present invention (not fired). Figure 2 This is a schematic diagram of the overall locking guide wire structure in an embodiment of the present invention (unlocked state). Figure 3 This is a locking-unlocking diagram in an embodiment of the present invention; Figure 4 This is a schematic diagram of the core wire connection structure in an embodiment of the present invention (the core wire is parallel to the limiting part). Figure 5 This is a schematic diagram of the core wire connection structure in an embodiment of the present invention (the core wire and the limiting part have a certain angle). Figure 6 This is a partial schematic diagram of the connection between the core wire and the traction part in an embodiment of this utility model; Figure 7 This is a schematic diagram of the core wire passing through the annular structure in an embodiment of this utility model (the core wire is not bent under force). Figure 8 This is a schematic diagram of the core wire passing through the annular structure in an embodiment of the present invention (the core wire is bent under force). Figure 9 A schematic diagram of the expandable winding wire in this embodiment of the present invention; Among them, 1. core wire connection structure; 2. firing structure; 3. expandable winding wire; 11. Limiting part; 12. Traction part; 13. Core wire; 111. Ring structure; 112. Bending support section; 21. Handle tube; 22. Sleeve; 23. Wire loop. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] The purpose of this invention is to provide a core wire connection structure and a locking guide wire structure to solve the problems existing in the prior art. By using the annular structure of the limiting part to limit the position of the core wire, the core wire can be supported by the bending support section of the limiting part, avoiding the situation where the connection part breaks due to the excessive angle between the core wire and the traction part, thereby improving surgical safety and operational reliability.

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figures 1-9 As shown, this utility model provides a core wire connection structure 1, including a limiting part 11, a traction part 12, and a core wire 13. The limiting part 11 can constrain and limit the position of the core wire 13. Specifically, the limiting part 11 includes a bending support section 112 and an annular structure 111. The annular structure 111 is connected to the distal end of the bending support section 112 (the distal end refers to the end away from the surgeon, and the proximal end refers to the end close to the surgeon, the same below). The two can be formed by winding steel wire or by a separate welding connection method. The bending support section 112 has a certain support capacity. It can bend and deform after being subjected to force and can recover its deformation under non-stress conditions. The traction section 12 is connected to the proximal end of the bending support section 112, and the proximal end of the core wire 13 is connected to the traction section 12. The distal end of the core wire 13 passes through the annular structure 111, thereby allowing the annular structure 111 to define the position of the core wire 13. The bending support section 112 then supports the deformation of the core wire 13. If the core wire 13 is subjected to traction forces at different angles, it will cause the limiting section 11 to move as a whole (e.g., ...). Figure 8As shown, by increasing the bending radius of the core wire 13, the resilience of the bending support section 112 can reduce the possibility of the operator pulling the core wire 13 at a larger angle. The distal end of the core wire 13 is used to connect to the expandable winding 3. After the expandable winding 3 is fired, it can abut against the inner wall of the electrode wire (which is a hollow tubular structure). When pulling the core wire 13, it can move the electrode wire together, thereby allowing the electrode wire to be removed by pulling the core wire 13 using the traction part 12.

[0026] When external traction is performed after locking the electrode wire using the expandable winding wire 3, the core wire 13 and the tail cable (i.e., the bent support section 112) may be pulled at a certain angle. Under large angles and repeated bending, the tensile strength of the core wire 13 at the welding point will be greatly reduced, leading to breakage. Once the core wire 13 and the traction part 12 break, the surgery will fail. This invention utilizes the annular structure 111 of the limiting part 11 to limit the position of the core wire 13, allowing the core wire 13 to be supported by the bent support section 112 of the limiting part 11. This reduces the relative positional variation between the core wire 13 and the traction part 12, ensuring that the core wire 13 mainly bears axial stress. This avoids the connection point breaking due to an excessively large angle between the core wire 13 and the traction part 12, thus improving surgical safety and operational reliability.

[0027] In one implementation, such as Figure 7 and Figure 8 As shown, the limiting part 11 is formed by winding a limiting steel wire. The annular structure 111 is in the shape of a circular ring, an elliptical ring, or a rhombus ring. After the core wire 13 passes through, it can limit the position in various directions. The annular structure 111 is preferably a rhombus ring. The head end of the rhombus ring is smaller, which makes it easier to insert into the handle tube 21. At the same time, the edge of the middle of the rhombus ring can contact the inner wall of the handle tube 21 to ensure the friction between the rhombus ring and the handle tube 21. Thus, after the core wire connecting structure 1 is applied to the locking guide wire structure, it can have the dual functions of locking and anti-slip and stress protection.

[0028] In one embodiment, the diameter of the limiting wire is 0.3mm to 0.6mm, preferably 0.5mm. The limiting wire has stronger bending resistance than the core wire 13, and can provide a certain support and rebound force for the core wire 13, so as to avoid the core wire 13 from deviating at too large an angle.

[0029] In one implementation, such as Figure 7 and Figure 8 As shown, the traction unit 12 adopts a fixed tube with an axial passage in the middle. The limiting steel wire passes through the fixed tube and is welded to both ends of the fixed tube to achieve relative fixation between the limiting steel wire and the fixed tube. When the fixed tube is pulled, the core wire 13 can be pulled to move, thereby realizing the traction function of the core wire 13.

[0030] In one embodiment, the core wire 13 is connected to the fixing tube by bonding or welding, making the connection between the core wire 13 and the fixing tube stable and reliable. Combined with the structural design of the limiting part 11, it can effectively ensure a reliable connection between the core wire 13 and the fixing tube. The core wire 13 itself has high tensile strength, preferably above 2500 MPa.

[0031] like Figures 1-9 As shown, this utility model provides a locking guide wire structure, including an expandable winding wire 3, a firing structure 2, and a core wire connection structure 1 as described above. The distal end of the expandable winding wire 3 is fixedly connected to the distal end of the core wire 13, and the proximal end of the expandable winding wire 3 is wound around the core wire 13. Therefore, when the proximal end of the expandable winding wire 3 is pushed, the expandable winding wire 3 can expand and deform, increasing its diameter, and thus abutting against the inner diameter side of the electrode wire to lock the electrode wire. The firing structure 2 is used to push the proximal end of the expandable winding wire 3 to contract towards the distal end. The firing structure 2 can be a push tube or a guide wire, having a certain strength greater than the deformation resistance of the expandable winding wire 3, capable of pushing the expandable winding wire 3 to deform and maintaining it in the deformed state.

[0032] In one implementation, such as Figure 3 As shown, the firing structure 2 includes a sleeve 22 and a handle tube 21. The sleeve 22 is sleeved on the core wire 13 and can slide on the core wire 13. The distal end of the sleeve 22 is used to abut the proximal end of the expandable winding wire 3. Thus, by moving the sleeve 22 on the core wire 13, the expandable winding wire 3 can be expanded and deformed by the sleeve 22. The distal end of the handle tube 21 is connected to the proximal end of the sleeve 22. The connection can be made by welding. That is, the handle tube 21 and the sleeve 22 are fixedly connected and can move synchronously. The sleeve 22 can be moved by the handle tube 21. The handle tube 21 is designed for easy handheld operation.

[0033] In one implementation, such as Figure 3 As shown, the annular structure 111 is used to be inserted into the handle tube 21 after compression. The annular structure 111 has the ability to recover its deformation after compression. Therefore, after the annular structure 111 is inserted into the handle tube 21, it can abut against the inner wall of the handle tube 21, so that there is friction between the annular structure 111 and the handle tube 21. The position of the handle tube 21 can be constrained and limited by the annular structure 111, so as to avoid the operator accidentally triggering the inner cavity of the locking electrode wire when the expandable winding wire 3 has not reached the predetermined locking position, thereby improving the safety and convenience of the operation.

[0034] In one embodiment, the frictional force between the annular structure 111 and the handle tube 21 after assembly is 10N~15N, which is sufficient to prevent accidental firing.

[0035] In one implementation, such as Figure 3 As shown, it also includes a suture ring 23, which is connected to the distal end of the handle tube 21. This connection can be achieved by welding. In this case, the suture ring 23, the sleeve 22, and the handle tube 21 are integrated into a single structure, achieving integrated operation. The suture ring 23 is annular and can be made of wound steel wire. The suture ring 23 facilitates clamping with tools such as hemostatic forceps, making it easier to operate during surgery and allowing for easier movement of the sleeve 22 to fire the expandable wound wire 3.

[0036] In one implementation, such as Figure 9 As shown, the expandable winding 3 adopts a multi-helix winding structure, which includes at least two sets of windings arranged side by side. The windings in the starting and ending sections of the multi-helix winding structure are tightly fitted together. In the middle section of the multi-helix winding structure, the windings are spaced apart in the axial direction. Thus, the starting section is connected to the far end of the core wire 13, and the ending section is a free section. When the ending section is pushed by the sleeve 22, the gap in the middle section can be reduced, and the winding expands to the outer diameter side.

[0037] like Figure 2 and Figure 3 As shown, in the initial state, the locking guide wire structure of this utility model has the rhomboid annular structure 111 of the limiting steel wire pressed into the handle tube 21. The friction generated by the compression of the rhomboid ring and the inner wall of the handle tube 21 prevents the operator from accidentally firing. In use, pushing the handle tube 21 or using a tool to pull the wire-connecting ring 23 moves the sleeve 22, causing the handle tube 21 to disengage from the annular structure 111. After further movement, the expandable winding wire 3 is compressed and deformed, achieving the effect of pressing and connecting the expandable winding wire 3 to the inner wall of the electrode wire. Then, by pulling the fixing tube, the core wire 13 is moved, thereby removing the electrode wire from the body.

[0038] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A core yarn connecting structure characterized by comprising: include: A limiting part, the limiting part including a curved support section and an annular structure, the annular structure being connected to the distal end of the curved support section; A traction unit, which is connected to the proximal end of the curved support section; And a core wire, the proximal end of which is connected to the traction part, the distal end of which passes through the annular structure, and the distal end of which is used to connect to an expandable winding wire.

2. The core yarn connection structure according to claim 1, characterized by: The limiting part is formed by winding a limiting steel wire, and the annular structure is a circular ring, an elliptical ring, or a rhomboid ring.

3. The core yarn connection structure according to claim 2, characterized by: The diameter of the limiting steel wire is 0.3mm to 0.6mm.

4. The core yarn connection structure according to claim 2, characterized by: The traction part adopts a fixed tube, the limiting steel wire passes through the fixed tube, and the limiting steel wire is welded to both ends of the fixed tube respectively.

5. The core yarn connection structure according to claim 4, characterized by: The core wire is connected to the fixing tube by bonding or welding.

6. A locking guidewire structure, comprising: include: An expandable winding wire, wherein the proximal end of the expandable winding wire is wound and sleeved on the core wire; A firing mechanism is provided for pushing the expandable winding wire to expand the expandable winding wire and then locking the electrode wire. And the core wire connection structure as described in any one of claims 1-5.

7. The locking guidewire structure of claim 6, wherein: The firing mechanism includes a sleeve and a handle tube. The sleeve is fitted onto the core wire, and the distal end of the sleeve is used to abut against the proximal end of the expandable winding wire. The distal end of the handle tube is connected to the proximal end of the sleeve, and the handle tube is used to push the sleeve to move.

8. The locking guidewire structure of claim 7, wherein: The annular structure is used to be inserted into the handle tube after compression, and there is friction between the annular structure and the handle tube.

9. The locking guidewire structure of claim 7, wherein: It also includes a knot ring, which is connected to the distal end of the handle tube.

10. The locking guidewire structure of claim 6, wherein: The expandable winding adopts a multi-helix winding structure, which includes at least two sets of windings arranged side by side. The turns of the windings are tightly fitted together in the starting and ending sections of the multi-helix winding structure. In the middle section of the multi-helix winding structure, the turns of the windings are spaced apart in the axial direction.

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