Non-vascular cavity guide wire

Abstract

The utility model relates to the technical field of medical instruments, and particularly discloses a non-vascular cavity guide wire which comprises a core wire, a spring tube and an outer coating, the spring tube is arranged at the far end of the core wire in a sleeved mode, the outer coating wraps the outer side of the core wire, and the spring tube is located between the core wire and the outer coating. According to the non-vascular cavity guide wire in the scheme, the spring tube is arranged at the far end of the core wire in the sleeving mode, it is ensured that the far end of the guide wire has good flexibility, meanwhile, the elasticity of the far end of the guide wire can be improved, the elastic recovery capacity of the far end of the guide wire is ensured, the spring tube can play a role in restraining and correcting the far end of the core wire, and the non-vascular cavity guide wire is good in flexibility. The far end of the guide wire is not prone to bending after being bent, the guide wire can better adapt to the shape and curvature of a non-vascular cavity, damage and friction of the guide wire to surrounding tissue are reduced, and therefore it is guaranteed that the core wire is inserted into the non-vascular cavity smoothly.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a non-vascular cavity guide wire. Background Art

[0002] A non-vascular lumen guidewire is a slender guidewire, which is usually made of flexible material and has excellent flexibility and lubricity. It is mainly used in the treatment of non-vascular cavities to guide surgical instruments into non-vascular cavities, such as guiding catheters, inserters and other surgical instruments. The non-vascular lumen guidewire plays a role in positioning and guiding, helping doctors to accurately place surgical instruments in the correct position.

[0003] Since the interior of non-vascular cavities is usually narrow and tortuous, the non-vascular lumen guidewire is required to have good flexibility. However, the non-vascular lumen guidewire in the related art may be bent, tangled or not inserted smoothly during use. Utility Model Content

[0004] The utility model discloses a non-vascular cavity guide wire, which solves the technical problem of non-vascular cavity guide wire in related technology being difficult to insert when being introduced into the non-vascular cavity of a patient.

[0005] In order to solve the above problems, the utility model adopts the following technical solutions:

[0006] The present application provides a non-vascular lumen guidewire, which includes a core wire, a spring tube and an outer covering layer, wherein the spring tube is sleeved on the distal end of the core wire, the outer covering layer is coated on the outside of the core wire, and the spring tube is located between the core wire and the outer covering layer.

[0007] Furthermore, the core wire includes a first flexible segment and a second flexible segment, the second flexible segment is connected to the distal end of the first flexible segment, and the spring tube is sleeved on the second flexible segment so that the elasticity of the second flexible segment is greater than the elasticity of the first flexible segment.

[0008] Furthermore, the first flexible section is integrally connected to the second flexible section, and a diameter of the second flexible section is smaller than a diameter of the first flexible section.

[0009] Furthermore, along the extension direction of the core wire from its proximal end to its distal end, the diameter of the second flexible section gradually decreases.

[0010] Furthermore, the diameter of the spring tube is smaller than the diameter of the first flexible section.

[0011] Furthermore, the junction between the first flexible section and the second flexible section is connected and fixed to the proximal end of the spring tube.

[0012] Furthermore, the connection between the first flexible section and the second flexible section is glued and fixed to the proximal end of the spring tube.

[0013] Furthermore, a frosted portion is provided at the junction of the first flexible section and the second flexible section, and the proximal end portion of the spring tube is glued and fixed to the frosted portion.

[0014] Furthermore, a ball head is connected to the distal end of the second flexible section, and a gap is provided between the ball head and the distal end of the outer covering layer.

[0015] Further, the diameter of the ball head is greater than the diameter of the distal end of the outer covering layer.

[0016] Furthermore, a distal end portion of the outer covering layer is provided with a chamfer.

[0017] The technical solution adopted by the utility model can achieve the following beneficial effects:

[0018] The non-vascular lumen guidewire of the present application is provided with a spring tube at the distal end of the core wire, which can increase the elasticity of the distal end of the guidewire while ensuring that the distal end of the guidewire has good flexibility, thereby ensuring the elastic recovery ability of the distal end of the guidewire. The spring tube can restrain and correct the distal end of the core wire, so that the distal end of the guidewire is not easy to bend after bending, and can better adapt to the shape and curvature of the non-vascular lumen, reduce the damage and friction of the guidewire to the surrounding tissues, thereby ensuring the smoothness of the core wire insertion into the non-vascular lumen. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a schematic structural diagram of a non-vascular lumen guidewire according to an embodiment of the present application;

[0021] Figure 2 yes Figure 1 A local enlarged schematic diagram of the middle A;

[0022] Figure 3 is a schematic diagram of the structure of the core wire of an embodiment of the present application;

[0023] Figure 4 yes Figure 3 A partial enlarged schematic diagram of point B in the middle;

[0024] Figure 5is a cross-sectional view of the front end portion of the non-vascular lumen guidewire of an embodiment of the present application;

[0025] Figure 6 yes Figure 5 A partial enlarged schematic diagram of point C in the middle.

[0026] In the figure:

[0027] 100-core wire, 110-first flexible section, 120-second flexible section; 200-spring tube; 300-outer covering layer; 400-ball head. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0029] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0030] The following is combined with Figures 1 to 6 , the non-vascular cavity guidewire provided in the embodiment of the present application is described in detail through specific embodiments and their application scenarios.

[0031] See also Figure 1 , Figure 5 and Figure 6The embodiment of the present application discloses a non-vascular lumen guidewire, and the disclosed non-vascular lumen guidewire includes a core wire 100, a spring tube 200 and an outer coating 300. The core wire 100 is the main part of the non-vascular lumen guidewire, which is usually a metal wire with a certain flexibility, and can adapt to the tortuous non-vascular lumen. For example, the core wire 100 can be a nickel-titanium alloy wire, a stainless steel wire, etc. The outer coating 300 is coated on the outside of the core wire 100. The outer coating is usually made of a polymer material. The outer coating 300 can protect the core wire 100 from corrosion and damage, and at the same time provide good lubrication performance, which can reduce the friction and damage of the non-vascular lumen guidewire to the surrounding tissue when passing through a narrow and tortuous lumen. For example, the outer coating 300 can be made of polyethylene, polytetrafluoroethylene, etc.

[0032] In the embodiment of the present application, the spring tube 200 is sleeved on the distal end of the core wire 100, and the spring tube 200 is located between the core wire 100 and the outer covering layer 300. By sleeved the spring tube 200 on the distal end of the core wire 100, the spring tube 200 has better resilience after being bent under force than the core wire 100. Based on the setting of the spring tube 200, while ensuring that the distal end of the guide wire has good flexibility, the elasticity of the distal end of the guide wire can be increased to ensure the elastic recovery ability of the distal end of the guide wire. The spring tube 200 can restrain and correct the distal end of the core wire 100, so that the distal end of the guide wire is not easy to bend after bending, and can better adapt to the shape and curvature of the non-vascular cavity, reduce the damage and friction of the guide wire to the surrounding tissues, thereby ensuring the smoothness of the guide wire insertion into the non-vascular cavity.

[0033] In the examples of this application, see Figure 3 , Figure 4 , Figure 5 and Figure 6 The core wire 100 includes a first flexible section 110 and a second flexible section 120, the second flexible section 120 is connected to the distal end of the first flexible section 110, and the spring tube 200 is sleeved on the second flexible section 120, so that the elasticity of the second flexible section 120 is greater than the elasticity of the first flexible section 110. It should be noted that the first flexible section 110 and the second flexible section 120 in this article can be deformed under the action of external force to adapt to the tortuous cavity and the curved shape, and have a certain elastic recovery ability, and can restore the deformation after the external force is removed.

[0034] The elastic recovery capabilities of the first flexible section 110 and the second flexible section 120 can be the same or different. When the second flexible section 120 is not sleeved with the spring tube 200, since the second flexible section 120 first contacts the inner wall of the cavity, when the external force applied to the second flexible section 120 is too large or the time is too long, the second flexible section 120 is easy to bend and difficult to completely recover the deformation. In the embodiment of the present application, after the spring tube 200 is sleeved on the second flexible section 120, the elastic recovery capability of the entire guide wire in the second flexible section 120 is better than the elastic recovery capability of the first flexible section 110. In this way, the second flexible section 120 can be further bent at the distal end of the first flexible section 110 when probing into the cavity, so as to better adapt to the complex cavity shape of the non-vascular cavity. Based on the presence of the spring tube 200, the second flexible section 120 is easy to recover the deformation after bending deformation and is not easy to bend.

[0035] In an optional embodiment, the first flexible section 110 and the second flexible section 120 can be integrally connected using the same material, and the diameter of the second flexible section 120 is smaller than the diameter of the first flexible section 110. The integral connection of the first flexible section 110 and the second flexible section 120 can improve the stability and reliability of the entire core wire 100, and the first flexible section 110 and the second flexible section 120 become a continuous whole without joints or connection points, thereby avoiding problems such as loosening or breaking of the connection points; the second flexible section 120 has a smaller diameter, so that the second flexible section 120 has stronger bending flexibility and bending adaptability than the first flexible section 110.

[0036] In the embodiment of the present application, the diameter of the second flexible section 120 is smaller than the diameter of the first flexible section 110. In an optional implementation, see Figure 3 and Figure 4 , along the extension direction of the core wire 100 from its proximal end to its distal end, the diameter of the second flexible section 120 can be consistent. In another optional manner, the second flexible section 120 smoothly transitions with the first flexible section 110, and along the extension direction of the core wire 100 from its proximal end to its distal end, the diameter of the second flexible section 120 gradually decreases. In this way, the stress on the second flexible section 120 during the bending process can be gradually dispersed, avoiding the situation of stress concentration, making the second flexible section 120 more natural and smooth when bending, and not easy to bend.

[0037] In the embodiment of the present application, the diameter of the spring tube 200 is smaller than the diameter of the first flexible section 110. After the spring tube 200 is sleeved on the second flexible section 120, the first flexible section 110 can limit the spring tube 200 to prevent the spring tube 200 from arbitrarily jumping around on the core wire 100. In addition, the spring tube 200 and the second flexible section 120 have a good fit, and the spring tube 200 occupies a small space. The contact area with the surrounding tissue is reduced during the bending or passage of the guide wire, thereby reducing friction and resistance. This makes the distal end of the guide wire pass through the tortuous channel more smoothly, reducing stimulation and damage to the internal tissues of the human body.

[0038] In a further technical solution, the proximal end of the spring tube 200 is glued and fixed to the core wire 100. Specifically, the proximal end of the spring tube 200 is glued and fixed at the junction of the first flexible section 110 and the second flexible section 120, and the distal end of the spring tube 200 is a free end. In this way, the proximal end of the spring tube 200 is fixed, which can prevent the spring tube 200 from rotating or moving on the core wire 100, further preventing the spring tube 200 from arbitrarily jumping on the core wire 100, thereby improving the stability of the entire guide wire. On the other hand, the free end of the spring tube 200 can adaptively expand and contract along its axial direction, which can better adapt to the bending and changes of the cavity and reduce trauma to the patient.

[0039] The inventor discovered during the research that, since the outer surface of the core wire 100 is relatively smooth, after the spring tube 200 and the core wire 100 are glued and fixed, the adhesive layer formed after the glue is cured is easy to detach from the outer surface of the core wire 100, thereby causing the spring tube 200 to loosen. Based on this situation, in an optional embodiment of the present application, a frosted portion is provided at the junction of the first flexible section 110 and the second flexible section 120, and the proximal end of the spring tube 200 is glued and fixed to the frosted portion. The frosted portion can increase the adhesion area of ​​the glue, so that the adhesive layer formed after the glue is cured can be stably maintained on the core wire 100, and the glue can also penetrate into the gap between two adjacent spiral units of the spring tube 200, thereby increasing the stability of the connection between the spring tube 200 and the core wire 100.

[0040] See also Figure 2 , Figure 4 and Figure 6 In an optional embodiment of the present application, a ball head 400 is provided at the distal end of the second flexible section 120. Exemplarily, the ball head 400 can be connected to the core wire 100 by spot welding. The outer surface of the ball head 400 is an arc-shaped surface. When the guide wire is introduced into the patient's body cavity, the arc-shaped surface of the ball head 400 can better adapt to the inner wall of the cavity, reduce the contact area and friction with the inner wall of the cavity, and help to reduce the resistance encountered by the non-vascular cavity guide wire during operation. In addition, the arc-shaped surface of the ball head 400 can reduce damage to the inner wall of the cavity, reducing the risk of trauma and complications to the patient.

[0041] When the outer coating 300 is coated on the ball head 400, the thin wall of the outer coating 300 protrudes from the outer surface of the ball head 400 and forms a step surface. When the guide wire is inserted into the cavity, the thin wall of the outer coating 300 may contact the inner wall of the cavity and cause scratches. Based on this situation, in a further technical solution, there is a gap between the ball head 400 and the distal end of the outer coating 300, that is, the outer coating 300 is not coated on the ball head 400. When the guide wire is introduced into the cavity, the ball head 400 first contacts the inner wall of the cavity and pushes the inner wall of the cavity outward. The pushed inner wall of the cavity is difficult to contact the distal end surface of the thin wall of the outer coating 300, thereby avoiding the situation where the distal end surface of the thin wall of the outer coating 300 contacts the inner wall of the cavity and causes scratches.

[0042] In a further technical solution, the distal end of the outer covering 300 is provided with a chamfer, and the chamfer is preferably an arc-shaped chamfer. Based on the setting of the chamfer, the end face size of the distal end of the outer covering 300 is smaller, and it is more difficult to contact the inner wall of the cavity and cause scratches. Moreover, even if the inner wall of the cavity contacts the end face of the distal end of the outer covering 300, the setting of the chamfer can reduce the friction between the two, thereby ensuring the smoothness and safety of the guide wire extending into the cavity.

[0043] In a further technical solution, the diameter of the ball head 400 is larger than the diameter of the distal end of the outer covering 300. In this way, the inner wall of the cavity pushed outward by the ball head 400 can more easily directly pass over the distal end of the outer covering 300 without contacting the distal surface of the outer covering 300, thereby further ensuring the smooth movement of the guide wire.

[0044] It should be noted that, in this article, the term "comprises", "includes" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0045] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention.

Claims

1. A non-vascular lumen guidewire, characterized in that: It comprises a core wire (100), a spring tube (200) and an outer covering layer (300); wherein: The spring tube (200) is sleeved on the distal end of the core wire (100), the outer coating (300) covers the outside of the core wire (100), and the spring tube (200) is located between the core wire (100) and the outer coating (300).

2. The non-vascular lumen guidewire according to claim 1, characterized in that: The core wire (100) comprises a first flexible section (110) and a second flexible section (120), wherein the second flexible section (120) is connected to the distal end of the first flexible section (110), and the spring tube (200) is sleeved on the second flexible section (120), so that the elasticity of the second flexible section (120) is greater than the elasticity of the first flexible section (110).

3. The non-vascular lumen guidewire according to claim 2, characterized in that: The first flexible section (110) and the second flexible section (120) are integrally connected, and the diameter of the second flexible section (120) is smaller than the diameter of the first flexible section (110).

4. The non-vascular lumen guidewire according to claim 3, characterized in that: Along the extension direction of the core wire (100) from its proximal end to its distal end, the diameter of the second flexible section (120) gradually decreases.

5. The non-vascular lumen guidewire according to claim 4, characterized in that: The diameter of the spring tube (200) is smaller than the diameter of the first flexible section (110).

6. The non-vascular lumen guidewire according to any one of claims 2 to 5, characterized in that: The connection point between the first flexible section (110) and the second flexible section (120) is connected and fixed to the proximal end of the spring tube (200).

7. The non-vascular lumen guidewire according to claim 6, characterized in that: The connection between the first flexible section (110) and the second flexible section (120) is glued and fixed to the proximal end of the spring tube (200); And / or, a frosted portion is provided at the junction of the first flexible section (110) and the second flexible section (120), and the proximal end of the spring tube (200) is glued and fixed to the frosted portion.

8. The non-vascular lumen guidewire according to any one of claims 2 to 3, characterized in that: The distal end of the second flexible section (120) is connected to a ball head (400), and a gap is provided between the ball head (400) and the distal end of the outer covering layer (300).

9. The non-vascular lumen guidewire according to claim 8, characterized in that: The diameter of the ball head (400) is greater than the diameter of the distal end of the outer cover (300).

10. The non-vascular lumen guidewire according to claim 9, characterized in that: The distal end of the outer covering layer (300) is provided with a chamfer.

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