Extendable guidewire

Abstract

The utility model relates to a kind of extendable guide wire.The device can include first guide wire body and second guide wire body;First guide wire body includes first guide wire main unit and first guide wire connector;First guide wire connector includes connecting portion and expansion part, and first guide wire main unit is movably connected with connecting portion;Second guide wire body includes second guide wire main unit and second guide wire connector;Second guide wire connector is provided with the cavity accommodating at least part of first guide wire body, and second guide wire main unit is fixedly connected with second guide wire connector;When at least part of first guide wire body is accommodated in second guide wire body, first guide wire main unit moves along its axial direction to expansion part direction, expansion part is in expansion state, and first guide wire connector and second guide wire connector are interference fit.According to the technical scheme provided by the utility model, the close connection between the two guide wire bodies can be realized, the risk of loose or falling of the connecting structure during use is reduced, and the use safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an extendable guidewire. Background Technology

[0002] Guidewires are common medical devices used to guide or support other instruments or equipment during medical procedures. However, in some complex medical procedures, guidewires of standard length may not be able to reach the desired surgical site, making the procedure impossible. Additionally, two guidewires may be simply connected together to extend their length, but during the procedure, the two guidewires are prone to loosening or even detaching, which can not only interrupt the surgery but also potentially lead to safety hazards during the procedure. Utility Model Content

[0003] This invention provides an extendable guidewire to at least solve problems in related technologies such as how to improve the stability during guidewire extension. The technical solution of this invention is as follows:

[0004] According to a first aspect of the present invention, an extendable guidewire is provided, comprising a first guidewire body and a second guidewire body;

[0005] The first guidewire body includes a first guidewire main body unit and a first guidewire connector; the first guidewire connector includes a connecting part and an expansion part, and the first guidewire main body unit is movably connected to the connecting part.

[0006] The second guidewire body includes a second guidewire main body unit and a second guidewire connector; the second guidewire connector is provided with a cavity for accommodating at least a portion of the first guidewire body, and the second guidewire main body unit is fixedly connected to the second guidewire connector.

[0007] When the first guidewire body is at least partially housed within the second guidewire body, the first guidewire body unit moves along its axial direction toward the expansion portion, the expansion portion is in an expanded state, and the first guidewire connector and the second guidewire connector are in an interference fit.

[0008] In one possible implementation, the connecting part is provided with a connecting hole, the expansion part is provided with an expansion hole, and the connecting hole and the expansion hole are connected.

[0009] At the junction of the connecting part and the expansion part, the inner diameter of the connecting hole is equal to the inner diameter of the expansion hole; the inner diameter of the expansion hole decreases in the direction away from the connecting part.

[0010] In one possible implementation, the expansion portion includes at least two expansion lobes, with an expansion gap between two adjacent expansion lobes, the axial length of which is less than the axial length of the expansion portion.

[0011] In one possible implementation, the first guidewire body unit includes a first guidewire and a connecting rod; the connecting rod is movably connected to the connecting part.

[0012] In one possible implementation, the connecting hole is a threaded hole, and the first guide wire body unit is threadedly connected to the connecting part;

[0013] The outer wall of the connecting rod is provided with threads that are compatible with the threaded hole;

[0014] The expansion section has a frustoconical structure and is inserted into the cavity of the second guidewire connector.

[0015] In one possible implementation, the outer diameter of the connecting rod is equal to the maximum inner diameter of the expansion portion; when the expansion portion is inserted into the cavity of the second guidewire connector, the first guidewire body unit is rotated, and the first guidewire body unit moves along its axial direction toward the expansion portion, the expansion portion is in an expanded state, and the first guidewire connector and the second guidewire connector are interference-fitted.

[0016] In one possible implementation, the connecting rod has a conical structure, and the outer diameter of the connecting rod decreases in the direction away from the first guide wire; the maximum outer diameter of the connecting rod is greater than the outer diameter of the first guide wire, forming a first boss.

[0017] In one possible implementation, the connecting part has a tapered insertion hole, the inner diameter of which is adapted to the outer diameter of the connecting rod;

[0018] A second protrusion is circumferentially provided at one end of the connecting part near the main body unit of the first guide wire; the inner diameter of the second protrusion is greater than or equal to the outer diameter of the first guide wire; the inner diameter of the second protrusion is less than the maximum outer diameter of the first protrusion; the connecting rod is inserted into the tapered insertion hole; the first protrusion and the second protrusion are engaged.

[0019] In one possible implementation, the expansion hole is connected to the tapered insertion hole, and the minimum inner diameter of the expansion hole is less than or equal to the minimum outer diameter of the connecting rod; the expansion part has multiple protrusions spaced apart axially on its outer wall; the expansion part is inserted into the cavity of the second guidewire connector; the first guidewire body unit is pushed, the expansion part is in an expanded state, and the first guidewire connector and the second guidewire connector are interference-fitted.

[0020] In one possible implementation, the connecting rod includes a rod body 16 and a rod head, the rod head being disposed at an end away from the first guidewire; the maximum outer diameter of the rod head is less than or equal to the inner diameter of the second guidewire connector.

[0021] In one possible implementation, the expansion portion is fitted onto the connecting rod, with the rod head extending beyond the expansion portion. The minimum inner diameter of the expansion portion is greater than or equal to the outer diameter of the rod body portion 16, and the minimum inner diameter of the expansion portion is less than the maximum outer diameter of the rod head.

[0022] In one possible implementation, the rod head and at least part of the expansion portion are inserted into the cavity of the second guidewire connector; the connecting rod moves axially toward the first guidewire, the rod head abuts against the end of the expansion portion away from the first guidewire, the expansion portion is in an expanded state, and the first guidewire connector and the second guidewire connector are interference-fitted.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the present invention.

[0024] The technical solutions provided by the embodiments of this utility model bring at least the following beneficial effects:

[0025] When the first guidewire body is at least partially housed within the second guidewire body, the first guidewire main body unit moves axially towards the expansion portion. The expansion portion is in an expanded state. The first guidewire connector and the second guidewire connector are press-fitted, ensuring a tight connection between them and improving the connection strength. This avoids the risk of loosening or detachment due to external forces during operation. Furthermore, the press-fit ensures safety during operation, reducing safety risks caused by connection structure malfunctions. Simultaneously, it extends the lifespan of the guidewire, simplifying operation, shortening preparation time, and improving work efficiency.

[0026] Other features and aspects of the present invention will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions and advantages in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a structural diagram of an extendable guidewire according to an exemplary embodiment.

[0029] Figure 2 This is an external structure of a first guidewire shown according to an exemplary embodiment. Figure 1 .

[0030] Figure 3 An internal cross-section of an extendable guidewire is shown according to an exemplary embodiment. Figure 1 .

[0031] Figure 4This is an internal cross-sectional view of a first guidewire body according to an exemplary embodiment.

[0032] Figure 5 This is an external structure of a first guidewire shown according to an exemplary embodiment. Figure 2 .

[0033] Figure 6 An internal cross-section of an extendable guidewire is shown according to an exemplary embodiment. Figure 2 .

[0034] Figure 7 This is an external structure of a first guidewire shown according to an exemplary embodiment. Figure 3 .

[0035] In the figure, 10-first guidewire body, 11-first guidewire, 12-expansion section, 13-connecting rod, 14-connecting section, 15-rod head, 16-rod body, 20-connecting structure, 30-second guidewire body, 31-second guidewire main body unit, 32-second guidewire connector. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments in the specification, and not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or server that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0038] Various exemplary embodiments, features, and aspects of the present invention will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0039] The term "exemplary" as used herein means "serving as an example, embodiment, or illustration." Any embodiment illustrated herein as "exemplary" is not necessarily to be construed as superior to or better than other embodiments. The term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships may exist, for example, A and / or B, which can represent: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more of a plurality, for example, including at least one of A, B, and C, which can represent including any one or more elements selected from the set consisting of A, B, and C.

[0040] Furthermore, to better illustrate this utility model, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this utility model can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this utility model.

[0041] It should be noted that the following diagram shows one possible sequence of steps, and it is not strictly required to follow this order. Some steps can be performed in parallel without interdependence. The user information (including but not limited to user device information, user personal information, user behavior information, etc.) and data (including but not limited to data used for display, training data, etc.) involved in this utility model are all information and data authorized by the user or fully authorized by all parties.

[0042] A guidewire is a long, thin, and flexible medical device primarily used to guide other medical devices (such as catheters, stents, etc.) to a target location within blood vessels or other internal conduits. Guidewires are typically made of materials such as stainless steel or titanium alloys; this invention does not limit the material of the guidewire. For certain complex anatomical structures or other situations, a standard-length guidewire may not be long enough, necessitating the use of an extendable guidewire to securely connect two or more standard-length guidewires.

[0043] Figure 1 This is a structural diagram illustrating an extendable guidewire according to an exemplary embodiment. For example... Figure 1 As shown, it includes a first guidewire 10, a second guidewire 30, and a connecting structure 20.

[0044] The first guidewire body 10 includes a first guidewire main body unit and a first guidewire connector, and the second guidewire body 30 includes a second guidewire main body unit 31 and a second guidewire connector 32. The end of the connection structure 20 closest to the first guidewire body 10 is designated as the first guidewire connector, and the end of the connection structure 20 closest to the second guidewire body 30 is designated as the second guidewire connector 32.

[0045] The first guidewire connector includes a connecting portion 14 and an expansion portion 12, and the first guidewire main body unit and the connecting portion 14 are movably connected. The first guidewire main body unit includes a first guidewire 11 and a connecting rod 13. Accordingly, the connecting rod 13 of the first guidewire main body unit and the connecting portion 14 of the first guidewire connector are movably connected.

[0046] The connecting portion 14 of the first guidewire connector is provided with a connecting hole, and the expansion portion 12 is provided with an expansion hole. The connecting hole and the expansion hole are connected. The inner diameter of the connecting hole and the inner diameter of the expansion hole are equal at the junction of the connecting portion 14 and the expansion portion 12. The inner diameter of the expansion hole gradually decreases in the direction away from the connecting portion 14.

[0047] The second guidewire connector 32 is provided with a cavity that can accommodate at least a portion of the first guidewire body 10, that is, the second guidewire connector 32 is provided with an expansion portion 12 that can accommodate part or all of it. This invention does not limit the length of the second guidewire connector 32 or the length of the expansion portion 12. When at least a portion of the first guidewire body 10 is accommodated in the cavity of the second guidewire body 30, the first guidewire main body unit can move along its axial direction toward the expansion portion 12. At this time, the expansion portion 12 is in an expanded state, and thus, the first guidewire connector and the second guidewire connector 32 achieve an interference fit. Specifically, the expansion portion 12 is inserted into the cavity of the second guidewire connector 32, and the first guidewire main body unit moves along its axial direction toward the expansion portion 12. Consequently, the outer diameter of the expansion portion 12 gradually increases, that is, the expansion portion 12 expands toward the inner wall of the second guidewire connector 32, so that the first guidewire connector and the second guidewire connector 32 achieve an interference fit, thereby improving the stability and firmness of the extendable guidewire.

[0048] The second guide wire connector 32 and the second guide wire main body unit 31 are fixedly connected. The fixed connection can be achieved through welding, including brazing (using a filler metal with a melting point lower than the guide wire material, heating it to melt and fill the gap between the second guide wire connector 32 and the second guide wire main body unit 31, forming a strong connection after cooling); laser welding (using a high-energy-density laser beam to irradiate the gap, causing localized melting and solidification of the material to form a connection); and ultrasonic welding (using the mechanical energy generated by ultrasonic vibrations to generate frictional heat at the contact surface, thereby melting and connecting the material). The fixed connection can also be achieved through adhesive bonding, such as using quick-drying adhesives, epoxy adhesives, or UV-curing adhesives. This invention does not limit the fixed connection method of the second guide wire connector 32 and the second guide wire main body unit 31.

[0049] The inner wall of the second guidewire connector 32 can be made of the same material as the interventional guidewire, such as titanium alloy or stainless steel; this invention does not limit this. Both the inner wall of the second guidewire connector 32 and the outer wall of the expansion portion 12 can be made in an oxidized or frosted state, or other relatively rough forms; this invention does not limit these forms. Making the inner wall of the second guidewire connector 32 and the outer wall of the expansion portion 12 relatively rough can enhance the contact abrasion coefficient between the first and second guidewire connectors 32, thereby strengthening the connection between them and making the connection between the first and second guidewire connectors 32 more secure, ensuring the stability and safety of the extendable guidewire during use.

[0050] Figure 2 This is an external structural diagram of a first guidewire 10 according to an exemplary embodiment. Figure 2 As shown, the expansion section 12 includes at least two expansion flaps, and the number of expansion flaps is not limited in this invention. An expansion gap is provided between two adjacent expansion flaps, and the axial length of the expansion gap is less than the axial length of the expansion section 12, meaning the expansion gap does not penetrate the expansion section 12 along its axial direction. The circumferential spacing of the expansion gaps between two adjacent expansion flaps is less than or equal to the width of one expansion flap. This arrangement improves the flexibility of the expansion section during expansion, thereby making the extensionable guidewire connection more stable and reliable.

[0051] Figure 3 This is an internal cross-sectional view of an extendable guidewire according to an exemplary embodiment. Figure 3As shown, the connecting hole of the connecting part 14 can be configured as a threaded hole. The outer wall of the connecting rod 13 is threaded, and the outer diameter of the connecting rod 13 is equal to the inner diameter of the connecting part. Therefore, the thread on the outer wall of the connecting rod 13 matches the threaded hole. The first guide wire body unit can be threadedly connected to the connecting part 14, that is, the connecting rod 13 is threadedly connected to the connecting part 14. The expansion part 12 can be configured as a frustum-shaped structure, and the inner diameter of the expansion part 12 gradually decreases in the direction away from the connecting part 14. The minimum outer diameter of the expansion part 12 is smaller than the inner diameter of the second guide wire connector 32, thus the expansion part 12 can be inserted into the cavity of the second guide wire connector 32.

[0052] The outer diameter of the connecting rod 13 is equal to the maximum inner diameter of the expansion portion 12. The outer diameter of the first guide wire 11 is equal to the outer diameter of the connecting portion 14. Therefore, when the connecting rod 13 is rotated into the expansion portion 12, the first guide wire 11 can be adapted to connect with the end of the connecting portion near the first guide wire. When the expansion portion 12 is inserted into the cavity of the second guide wire connector 32, the first guide wire main body unit is rotated, and the first guide wire main body unit moves along the axial direction of the first guide wire connector towards the expansion portion 12. As a result, the expansion portion 12 is in an expanded state, that is, the expansion flaps of the expansion portion 12 expand towards the inner wall of the second guide wire connector 32, and the inner diameter of the expansion portion 12 gradually increases, thereby achieving an interference fit between the first guide wire connector and the second guide wire connector 32.

[0053] The connecting rod 13 and the first guide wire 11 are fixedly connected. The outer diameter of the connecting rod 13 is smaller than the outer diameter of the first guide wire 11. The connection method can be welding or bonding, etc. This utility model does not limit this.

[0054] When the guidewire is insufficient in length during use, an extendable guidewire is formed by connecting the first guidewire body 10 and the second guidewire body 30. Specifically, the expansion portion 12 is inserted into the second guidewire connector 32, and further, the connecting rod 13 is threadedly connected to the connecting portion 14, i.e., the threaded hole. Then, the connecting rod 13 moves axially towards the expansion portion 12 along the direction of the first guidewire connector. When the connecting rod 13 rotates to the expansion portion 12, the expansion flaps of the expansion portion 12 expand outwards, i.e., expand into the cavity of the second guidewire connector 32. At this time, the expansion portion 12 is in an expanded state. Further, when the expansion portion 12 is in close contact with the inner wall of the second guidewire connector 32, an interference fit is formed. This connection method improves the strength and reliability of the connection between the first guidewire body 10 and the second guidewire body 30, preventing loosening or separation during use.

[0055] If any one of the extendable guidewires, such as the first guidewire 10 or the second guidewire 30, becomes contaminated or damaged, only the contaminated or damaged guidewire needs to be replaced. For example, if the second guidewire 30 falls to the ground or becomes contaminated during surgery, the connecting rod 13 in the first guidewire 10 is rotated in the opposite direction to the second guidewire connector 32, causing the expansion flap of the expansion portion 12 to contract to its initial state, i.e., the inner diameter of the expansion hole decreases in the direction away from the connector 14. This allows the first guidewire connector to be easily pulled out of the second guidewire connector 32. Furthermore, a new second guidewire 30 adapted to the first guidewire connector can be interference-fitted to the first guidewire 10, allowing for quick and easy replacement of damaged or contaminated second guidewires 30, reducing the cost of using extendable guidewires, and improving efficiency in medical procedures.

[0056] In another possible implementation, such as Figure 4 As shown, the connecting rod 13 is configured with a conical structure, and its outer diameter decreases in the direction away from the first guide wire 11. The maximum outer diameter of the connecting rod 13, that is, the outer diameter at the connection point between the connecting rod 13 and the first guide wire 11, is greater than the outer diameter of the first guide wire 11, thus forming a first boss at the connection point between the connecting rod 13 and the first guide wire 11. The connecting rod 13 is fixedly connected to the first guide wire 11, and the specific connection method can be welding, which is not limited in this invention. The above configuration makes the first guide wire 11 and the connecting rod 13 more robust and stable, avoiding breakage during use.

[0057] The connecting part 14 is configured as a tapered insertion hole, the inner diameter of which matches the outer diameter of the connecting rod 13. A second boss is axially provided at one end of the connecting part 14 near the first guide wire connecting body. The inner diameter of the second boss is greater than or equal to the outer diameter of the first guide wire 11. The inner diameter of the second boss is also smaller than the maximum outer diameter of the first boss. When the connecting rod 13 is inserted into the tapered insertion hole, i.e., the connecting part 14, the first and second bosses engage. This engagement method not only further enhances the stability of the connection but also provides additional protection, preventing the connecting rod 13 from detaching from the connecting part 14.

[0058] The expansion hole is connected to the connecting hole, that is, the expansion hole is connected to the tapered insertion hole. The minimum inner diameter of the expansion hole is less than or equal to the minimum outer diameter of the connecting rod 13, which can prevent the connecting rod 13 from passing through the end of the expansion part 12 away from the connecting part, thereby improving the connection stability and reliability of the connecting rod 13 and the expansion part 12.

[0059] Figure 5 This is an external structural diagram of a first guidewire according to an exemplary embodiment. Figure 5As shown, the expansion part 12 has multiple protrusions spaced apart axially on its outer wall. These protrusions allow the expansion part 12 to be inserted into the cavity of the second guide wire connector 32, so that the protrusions of the expansion part 32 form a tight connection with the inner wall of the second guide wire connector 32, thereby achieving an interference fit between the first guide wire connector and the second guide wire connector 32.

[0060] In one possible implementation, the protrusions can be arranged circumferentially along the outer wall of the expansion portion 12, or arranged axially along the outer wall of the expansion portion 12 to form a string structure, or multiple protrusion units arranged circumferentially at intervals. This utility model does not limit the arrangement of the protrusions.

[0061] The expansion portion 12 is inserted into the cavity of the second guidewire connector 32. The inner wall of the second guidewire connector 32 is set to a relatively rough state, such as an oxidized or frosted state, to increase the friction between the expansion portion 12 and the second guidewire connector 32. Further, the first guidewire main body unit is pushed to move along its axial direction toward the expansion portion 12. At this time, the expansion portion 12 is in an expanded state. Correspondingly, the expansion flaps of the expansion portion 12 expand toward the inner wall of the second guidewire connector 32, that is, the protrusions of the expansion portion 12 are tightly connected to the inner wall of the second guidewire connector 32, thereby achieving an interference fit between the first guidewire connector and the second guidewire connector 32, improving the stable performance of the extendable guidewire during use.

[0062] In one possible implementation, the extendable guidewire can also be configured as follows: Figure 6 The structure shown includes a connecting rod 13 comprising a rod body 16 and a rod head 15. The rod head 15 can be configured as a spherical structure and is positioned at the end furthest from the first guidewire 11. That is, during the connection process between the first guidewire 10 and the second guidewire 30, the rod head 15 is first inserted into the second guidewire 30. The maximum outer diameter of the rod head 15 is less than or equal to the inner diameter of the second guidewire connector 32, allowing the rod head 15 to be smoothly inserted into the cavity of the second guidewire connector 32.

[0063] The expansion portion 12 is sleeved on the connecting rod 13. Specifically, the expansion portion 12 is sleeved on the rod body 16, and the minimum outer diameter of the rod head 15 is less than or equal to the outer diameter of the rod body 16. The rod head 15 extends beyond the expansion portion 12, meaning the axial length of the expansion portion 12 is less than the axial length of the rod body 16. The minimum inner diameter of the expansion portion 12 is greater than or equal to the outer diameter of the rod body 16, and the minimum inner diameter of the expansion portion 12 is less than the maximum outer diameter of the rod head 15. This arrangement ensures that the expansion portion 12 will not detach from the connecting rod 13 during the connection process, thereby improving the reliability and stability of the connection between the first guide wire 10 and the second guide wire 30.

[0064] When the rod head 15 and at least part of the expansion portion 12 are inserted into the second guide wire connector 32, the connecting rod 13 moves axially toward the first guide wire 11, and then the rod head 15 abuts against the end of the expansion portion 12 away from the first guide wire 11. The expansion portion 12 is in an expanded state, and the expansion flaps of the expansion portion 12 expand toward the inner wall of the second guide wire connector 32. Specifically, the inner wall of the expansion portion 12 and the rod head 15 are interference-fitted, and the outer wall of the expansion portion 12 and the second guide wire connector 32 are interference-fitted. This arrangement can achieve a stable connection between the first guide wire body 10 and the second guide wire body 30, improving safety in use.

[0065] Figure 7 This is an external structural diagram of a first guidewire according to an exemplary embodiment. Figure 7 As shown, the expansion section 12 may include at least two expansion flaps. When the first guidewire 10 and the second guidewire 30 are connected, the movable rod is inserted into the second guidewire connector 32. At this time, the expansion section 12 is pushed, and the expansion section 12 abuts against the rod head 15, that is, the expansion section 12 and the rod head 15 are interference-fitted. The expansion flaps of the expansion section 12 expand outward when subjected to external force, thereby achieving an interference fit between the expansion section 12 and the second guidewire connector 32, improving the stability and reliability of the guidewire connection. When the first guidewire 10 and the second guidewire 30 need to be disassembled, the expansion section 12 is retracted towards the first guidewire 11, thereby separating the expansion section 12 from the rod head 15, thus achieving flexible loading and unloading of the first guidewire 10 and the second guidewire 30.

[0066] The first guidewire connector and the second guidewire connector 32 in the extendable guidewire are compatible. When there is no need for guidewire extension, a sleeve can be provided on each of the first and second guidewire connectors 32. The sleeves can be made of corrosion-resistant and wear-resistant materials, such as plastic, and this invention does not limit this. The above arrangement can prevent the external environment from directly contacting the first and second guidewire connectors 32, preventing them from being impacted or scratched, thus improving the service life and reliability of the guidewire.

[0067] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0068] It should be understood that this invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

Claims

1. An extendable guidewire, characterized in that, Includes a first guidewire and a second guidewire; The first guidewire body includes a first guidewire main body unit and a first guidewire connector; the first guidewire connector includes a connecting part and an expansion part, and the first guidewire main body unit is movably connected to the connecting part; The second guidewire body includes a second guidewire main body unit and a second guidewire connector; the second guidewire connector is provided with a cavity for accommodating at least a portion of the first guidewire body, and the second guidewire main body unit is fixedly connected to the second guidewire connector; When the first guidewire body is at least partially housed within the second guidewire body, the first guidewire body unit moves along its axial direction toward the expansion portion, the expansion portion is in an expanded state, and the first guidewire connector and the second guidewire connector are in an interference fit.

2. The extendable guidewire according to claim 1, characterized in that, The connecting part is provided with a connecting hole, the expanding part is provided with an expanding hole, and the connecting hole is connected to the expanding hole; At the connection between the connecting portion and the expansion portion, the inner diameter of the connecting hole is equal to the inner diameter of the expansion hole; the inner diameter of the expansion hole decreases in the direction away from the connecting portion.

3. The extendable guidewire according to claim 1, characterized in that, The expansion portion includes at least two expansion lobes, and an expansion gap is provided between two adjacent expansion lobes. The axial length of the expansion gap is less than the axial length of the expansion portion.

4. The extendable guidewire according to claim 2, characterized in that, The first guide wire body unit includes a first guide wire and a connecting rod; the connecting rod is movably connected to the connecting part.

5. The extendable guidewire according to claim 4, characterized in that, The connecting hole is a threaded hole, and the first guide wire body unit is threadedly connected to the connecting part; The outer wall of the connecting rod is provided with threads, which are adapted to the threaded hole; The expansion section has a frustum-shaped structure and is inserted into the cavity of the second guidewire connector.

6. The extendable guidewire according to claim 5, characterized in that, The outer diameter of the connecting rod is equal to the maximum inner diameter of the expansion portion; when the expansion portion is inserted into the cavity of the second guidewire connector, the first guidewire body unit is rotated, and the first guidewire body unit moves along its axial direction toward the expansion portion, the expansion portion is in an expanded state, and the first guidewire connector and the second guidewire connector are in an interference fit.

7. The extendable guidewire according to claim 4, characterized in that, The connecting rod has a conical structure, and the outer diameter of the connecting rod decreases in the direction away from the first guide wire; The maximum outer diameter of the connecting rod is greater than the outer diameter of the first guide wire, forming a first protrusion.

8. The extendable guidewire according to claim 7, characterized in that, The connecting part has a tapered insertion hole, the inner diameter of which is adapted to the outer diameter of the connecting rod; A second protrusion is circumferentially provided at one end of the connecting part near the first guide wire body unit; the inner diameter of the second protrusion is greater than or equal to the outer diameter of the first guide wire; the inner diameter of the second protrusion is less than the maximum outer diameter of the first protrusion; the connecting rod is inserted into the tapered insertion hole; the first protrusion and the second protrusion are engaged.

9. The extendable guidewire according to claim 8, characterized in that, The expansion hole is connected to the tapered insertion hole, and the minimum inner diameter of the expansion hole is less than or equal to the minimum outer diameter of the connecting rod; the expansion part has multiple protrusions spaced apart axially on its outer wall; the expansion part is inserted into the cavity of the second guidewire connector; the first guidewire body unit is pushed, the expansion part is in an expanded state, and the first guidewire connector and the second guidewire connector are interference-fitted.

10. The extendable guidewire according to claim 4, characterized in that, The connecting rod includes a rod body and a rod head, with the rod head located at the end furthest from the first guide wire; the maximum outer diameter of the rod head is less than or equal to the inner diameter of the second guide wire connector.

11. The extendable guidewire according to claim 10, characterized in that, The expansion portion is sleeved on the connecting rod, the rod head extends beyond the expansion portion, the minimum inner diameter of the expansion portion is greater than or equal to the outer diameter of the rod body, and the minimum inner diameter of the expansion portion is less than the maximum outer diameter of the rod head.

12. The extendable guidewire according to claim 11, characterized in that, The rod head and at least part of the expansion portion are inserted into the cavity of the second guidewire connector; The connecting rod moves axially toward the first guide wire, and the rod head abuts against the end of the expansion portion away from the first guide wire. The expansion portion is in an expanded state, and the first guide wire connector and the second guide wire connector are interference-fitted.

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