Bending-adjustable guide wire

Abstract

The application provides an adjustable bending guide wire, comprising: a main tube body having a proximal end and a distal end opposite to each other, and an inner cavity penetrating from the proximal end to the distal end, the inner cavity being provided with a traction member; the traction piece is provided with an elastic section, the elastic section is attached to the far end or close to the far end, the axial length of the elastic section is increased through movement of the traction piece, and the main pipe body changes the bending shape of the main pipe body in response to the movement of the traction piece. According to the adjustable bent guide wire, the problem that a catheter body needs to be frequently replaced according to the requirement of an operation in the operation process can be solved, and the operation risk can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to an adjustable curved guide wire. Background Art

[0002] Medical guidewire is a kind of medical equipment, which is mainly used in various medical operations, such as interventional therapy, cardiovascular and cerebrovascular surgery, gynecological surgery, etc. The main function of medical guidewire is to guide the operation, so that doctors can successfully achieve the purpose of treatment.

[0003] There are many types of medical guidewires, including microguidewires, guide guidewires, renal artery guidewires, and angiography guidewires, which can be used for different indications and usage scenarios. Medical guidewires are made of a variety of materials. For example, some guidewires are made of metal materials that are not easily deformed, such as stainless steel or nickel-titanium alloy. These guidewires have good strength and hardness, can withstand greater pressure and torque, and will not break or bend during use. Other guidewires are made of elastic materials such as polyester or polycarbonate, which can bend and rotate well to meet operational needs.

[0004] In clinical use, due to different indications, two or more guide wires are usually used during surgery, and they need to be replaced frequently to meet the needs of the surgery. However, the length of the guide wire is generally more than 1.5 meters, but the diameter is very thin, and the replacement operation is cumbersome, which not only increases the overall operation time, but also increases the difficulty of the operation, and it is more likely that the guide wire will be damaged during the replacement process.

[0005] Therefore, the market urgently needs a guidewire that can adapt to a variety of different application scenarios to adapt to various complex and changeable vascular structures and usage requirements. Utility Model Content

[0006] In order to solve at least one technical problem existing in the prior art, the present application provides an adjustable curved guidewire to solve the need for frequent replacement of the catheter tube body according to surgical requirements during surgery and to reduce surgical risks.

[0007] In order to achieve the above objectives, the technical solutions provided by this application are as follows:

[0008] An adjustable curved guidewire comprises: a main body having a proximal end and a distal end relative to each other, and an inner cavity extending from the proximal end to the distal end, wherein a traction member is arranged in the inner cavity; the traction member has an elastic section, and the elastic section is attached to the distal end or close to the distal end, and the movement of the traction member drives the axial length of the elastic section to increase, and the main body changes its own bending shape in response to the movement of the traction member.

[0009] As a preferred embodiment, the traction member further comprises a rigid section, the rigid section is connected to the elastic section, and the rigid section is passed through the proximal end of the main tube.

[0010] As a preferred embodiment, the elastic section has a lower softness than the rigid section.

[0011] As a preferred implementation manner, the elastic section and the rigid section are made of the same material, and the elastic section and the rigid section are integrally formed.

[0012] As a preferred implementation, the elastic section is a spring, and the winding radius of the spring tends to decrease from the proximal end of the elastic section to the distal end of the elastic section.

[0013] As a preferred embodiment, the main pipe comprises, from inside to outside, an elastic layer and an outer sheath, the traction member is arranged inside the elastic layer, and a hydrophilic coating is arranged on the outer surface of the outer sheath.

[0014] As a preferred implementation, a channel tube is provided between the elastic layer and the traction member, and the channel tube is used to isolate the elastic layer from the traction member.

[0015] As a preferred implementation, the elastic layer comprises: a hypotube and a developing wire; the developing wire is wound around the outer surface of the hypotube, or the developing wire is embedded in the hypotube.

[0016] As a preferred embodiment, a thickness space is provided on the outer surface of the hypotube, and the developing wire is wound in the thickness space and does not exceed the maximum outer diameter of the outer surface of the hypotube.

[0017] As a preferred embodiment, the elastic section and the outer sheath are developed materials.

[0018] As a preferred embodiment, it further comprises a handle, wherein the handle is connected to the proximal end of the main pipe body, and the handle is configured to drive the traction member to move.

[0019] Beneficial effects:

[0020] The adjustable bend guidewire provided in the embodiment of the present application can change the bending shape of the main body by moving the traction member in the inner cavity of the main body. For example, when the original state of the guidewire head end is straight, when passing through a blood vessel bifurcation, the traction member can be caused to move by the handle to bend the guidewire body head end to align in the desired direction. Even after being pushed to a more distal end or passing through a tortuous blood vessel, compared with a traditional guidewire, the difficulty of adjusting the guidewire as a whole will be much smaller under the condition of adjustable bend at the head end.

[0021] In addition, the elastic section of the traction piece is attached to the distal end of the tube body. The traction piece has a buffer time when adjusting the bend of the guide wire tube head end, and the response is not very fast. Especially when a slight adjustment of the direction is required, the elastic section can provide slow deformation, so as to avoid over-adjustment and reduce surgical risks.

[0022] With reference to the following description and drawings, the specific embodiments of the present application are disclosed in detail, indicating the manner in which the principles of the present application can be adopted. It should be understood that the embodiments of the present application are not limited in scope.

[0023] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0024] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application 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 present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 Shown is a cross-sectional view of an adjustable curved guidewire provided by an embodiment of the present application;

[0027] Figure 2 Shown is a cross-sectional view of an adjustable curved guidewire provided by another embodiment of the present application;

[0028] Figure 3 Shown Figure 2 Schematic diagram of radial section;

[0029] Figure 4 Shown is a schematic diagram of an embodiment of a traction member of the present application;

[0030] Figure 5 Shown is a schematic diagram of another embodiment of the traction member of the present application.

[0031] Description of reference numerals:

[0032] 100. Main pipe body; 1. Pulling piece; 11. Elastic section; 12. Rigid section; 13. Welding point; 2. Elastic layer; 3. External sheath; 4. Channel pipe. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that these implementation methods are only used to illustrate the present invention and are not used to limit the scope. After reading the present invention, modifications of various equivalent forms of the present invention by those skilled in the art all fall within the scope defined in this application.

[0034] The terms "proximal end", "rear end" and "distal end", "front end" used in this application are relative to the clinician. The terms "proximal end" and "rear end" refer to the part relatively close to the clinician, and the terms "distal end" and "front end" refer to the part relatively far away from the clinician. It should be understood that the positions of "proximal end", "distal end", "rear end", "front end", "inside" and "outside" are defined for the convenience of description. However, the adjustable curved guide wire can be used in many directions and positions, so these terms expressing relative positional relationships are not limited and absolute.

[0035] In this application, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a movable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The following will be combined Figures 1 to 5 The adjustable curved guidewire of the embodiment of the present specification is explained and described. It should be noted that in the embodiment of the present utility model, the same reference numerals represent the same components. For the sake of brevity, the detailed description of the same components is omitted in different embodiments, and the descriptions of the same components can be referenced and quoted to each other.

[0037] Guidewires are common surgical instruments used in interventional surgery. In minimally invasive interventional treatment, guidewires are usually implanted through blood vessels to the target location, and then medical devices or interventional catheters are implanted along the guidewire channel to the target location to achieve the purpose of treating the target location. Since the target location is usually an organ with a complex human structure, in order to achieve the purpose of device implantation, the guidewire may need to be replaced during the process to pass through the complex and changeable human structure.

[0038] This specification provides an adjustable curved guide wire, such as Figure 1 and Figure 2As shown, a pull wire is implanted inside the guide wire. One or more cavities for inserting the pull wire are provided inside the guide wire, one end of each pull wire is fixed to the wall of the guide wire, and the other end of each pull wire is used to apply a force to bend the front end of the guide wire. In this way, when passing through complex and tortuous blood vessels, the front end of the guide wire is bent into a desired shape so that the guide wire can pass through the blood vessel smoothly. For example, when the original state of the guide wire head end is straight, when passing through a bifurcation of the blood vessel, the handle can be used to cause the traction member 1 to move, so that the head end of the guide wire tube body is bent to align with the desired direction. Even after being pushed to a more distal end or passing through a tortuous blood vessel, compared with the traditional guide wire, under the condition that the head end can be adjusted, the difficulty of adjusting the guide wire as a whole will be much smaller.

[0039] In the present specification, the guide wire includes: a main body 100, having relative proximal and distal ends, and an inner cavity running from the proximal end to the distal end, in which a traction member 1 is arranged; the traction member 1 has an elastic segment 11, and the elastic segment 11 is attached to the distal end or close to the distal end, and the movement of the traction member 1 drives the axial length of the elastic segment 11 to increase, and the main body 100 changes its own bending shape in response to the movement of the traction member 1.

[0040] The main body 100 has an axial structure, and has a proximal end and a distal end relative to each other. The inner cavity of the main body 100 runs through from the proximal end to the distal end, and a traction member 1 is arranged in the inner cavity. The distal end of the main body 100 can be a closed end, and the traction member 1 is connected to the distal end or near the distal end of the main body 100. When a force is applied to the traction member 1, the distal end or a part near the distal end of the main body 100 can be caused to bend. In order to operate the traction member 1 to cause the bending of the main body 100, a handle (not shown in the figure) is connected to the proximal end of the main body 100, and the handle is configured to drive the traction member 1 to move.

[0041] Furthermore, the handle includes a bending adjustment mechanism, which is connected to the proximal end of the traction member 1 and is used to control the curvature of the main body 100 by pulling the traction member 1. The handle in this specification can be implemented by using an existing operating handle with a traction member control function, and its specific structure is well known to those skilled in the art and will not be described in detail here.

[0042] The traction member 1 is made of a relatively soft material with high tensile strength and not easy to deform, which can be a metal or polymer material such as steel wire, steel rope, nylon line or PE line. In order to cause the main body 100 to bend, the distal end or the part close to the distal end of the main body 100 is made of a relatively soft material and contains a material with memory properties, so that the traction member 1 can restore its original shape by its own memory property when the force is lost.

[0043] In this application, if Figures 1 to 5As shown, the traction member 1 has an elastic section 11, and the elastic section 11 is attached to the distal end or a portion close to the distal end of the main body 100. The elastic section 11 is located at the distal end of the traction member 1. When the proximal end of the traction member 1 is pulled, the pulling force can be transmitted to the elastic section 11 of the traction member 1 and drive the axial length of the elastic section 11 to increase. When the axial length of the elastic section 11 increases to a certain extent, the main body 100 will be pulled, so that the bending shape of the main body 100 changes.

[0044] In the adjustable curved guidewire of the present embodiment, the axial length of the elastic section 11 of the traction member 1 increases when subjected to tension, so that the traction member 1 has a buffer time when adjusting the curved shape of the guidewire tube head end, and the guidewire tube head end does not respond quickly to changes. Especially when it is necessary to slightly adjust the direction of the guidewire tube head end, the elastic section 11 can provide slow deformation for the tube head end, so that over-adjustment will not occur, reducing surgical risks. When the doctor or operator no longer applies force to the proximal end of the traction member 1, the guidewire tube head end returns to its original shape, and the elastic section 11 also restores its own deformation, that is, the axial length of the elastic section 11 is reduced for the next adjustment.

[0045] The main body 100 has a bending section, which refers to the section of the main body 100 whose bend shape is changed. The elastic section 11 is attached to the distal end or the part close to the distal end of the main body 100, so that the bending section of the main body 100 can extend to the distal end, and the bending section of the main body 100 can also extend to the part close to the distal end. When the bending section of the main body 100 extends to the part close to the distal end, a straight section can be provided between the bending section and the distal end of the main body 100, and the straight section is softer than the bending section, so that after the bend shape of the guide wire is changed, the straight section is coaxial with the target blood vessel, preventing the distal end of the guide wire from hitting the blood vessel wall.

[0046] Specifically, the traction member 1 further comprises a rigid section 12, which is connected to the elastic section 11 and extends out from the proximal end of the main tube 100. The rigid section 12 is connected to a handle at the proximal end of the main tube 100 and is pulled by the bending mechanism of the handle. Therefore, the rigid section needs to have a certain hardness to prevent it from being broken.

[0047] Generally speaking, in other types of medical devices with bending functions, such as ultrasonic catheters, angiography catheters, etc., the pull wire inside the catheter is usually a hard core wire, which is relatively thin as a whole, and the head end of the hard core wire is fixed to the bending section of this type of catheter to cause the catheter to change its curvature. When the curvature of the catheter changes, the hard core wire inside the catheter will inevitably bend, mainly the distal end of the hard core wire that bends along with the bending section of the catheter. When the number of bends exceeds a certain frequency, the distal end of the hard core wire is prone to breakage. In order to avoid the above situation, the elastic section 11 is made to be lower in softness than the rigid section 12, that is, the elastic section 11 is softer than the rigid section 12, so that the distal end of the traction member 1 will not break easily.

[0048] In some embodiments, the elastic segment 11 and the rigid segment 12 are made of the same material, and the elastic segment 11 and the rigid segment 12 are integrally formed. In this embodiment, the elastic segment 11 can be formed on the traction member 1 by a cutting process, and the remaining part of the traction member 1 naturally forms the rigid segment 12. Since the elastic segment 11 is formed by cutting, the softness of the elastic segment 11 is necessarily lower than that of the rigid segment 12 of the same material. Alternatively, in some embodiments, the elastic segment 11 and the rigid segment 12 are made of different materials, and then connected to form the traction member 1.

[0049] like Figure 4 and Figure 5 As shown, the elastic section 11 is a spring. Preferably, the winding radius of the spring decreases from the proximal end of the elastic section 11 to the distal end of the elastic section 11. On the market, the guide wire is basically designed with a gradual size structure from the proximal end to the distal end. Setting the elastic section 11 as a gradual structure is more in line with the use requirements of the guide wire, so that the distal end of the guide wire can be thinner and softer.

[0050] In this manual, if Figures 1 to 3 As shown, the main body 100 includes, from the inside to the outside: an elastic layer 2 and an outer sheath 3, the traction member 1 is inserted into the elastic layer 2, and a hydrophilic coating is provided on the outer surface of the outer sheath 3. The elastic layer 2 is used to increase the bending resistance of the main body 100. The elastic layer 2 can be a sea wave tube or a coil spring, or a combination of a sea wave tube and a coil spring layer, or a combination of a sea wave tube and two coil spring layers of different structures and a mesh woven layer. The elastic segment 11 can be attached to the inner wall of the elastic layer 2, for example, it can be fixed by welding or fusion. Figure 1 As shown, there is a welding point 13 between the elastic section 11 and the elastic layer 2 .

[0051] The outer sheath 3 can be a layer of hot-melt polymer material, such as TPU material, that wraps the elastic layer 2 and the traction member 1. The polymer material can be wrapped by hot-melt infiltration, pouring, or inserting in the form of a hollow tube and then coating and heating.

[0052] In some embodiments, Figure 3 As shown, a channel tube 4 is provided between the elastic layer 2 and the traction member 1, and the channel tube 4 is used to isolate the elastic layer 2 and the traction member 1. The channel tube 4 can be made of smooth materials such as polytetrafluoroethylene or high-density polyethylene, and the traction member 1 can move in the channel tube 4 to avoid direct friction between the traction member 1 and the elastic layer 2. In addition, when the channel tube 4 is provided, the elastic section 11 of the traction member 1 can be attached to the channel tube 4.

[0053] In some embodiments, the elastic layer 2 includes: a hypotube and a developing wire; the developing wire is wound around the outer surface of the hypotube, or the developing wire is embedded in the hypotube. In this embodiment, the developing wire can be firstly wound around the middle traction member 1 as an intermediate layer, and then the hypotube is sleeved on the traction member 1 as an intermediate layer; or a developing mark can be embedded in the hypotube in advance, and the developing mark can be platinum iridium or gold or other developing enhancement materials.

[0054] In some embodiments, a thickness space is provided on the outer surface of the hypotube, and the developing wire is wound in the thickness space and does not exceed the maximum outer diameter of the outer surface of the hypotube. The thickness space refers to a thinning process on the outer surface of the hypotube, thereby reserving a thickness space, and then the developing wire is wound on the thickness space, and the developing wire can be a platinum wire or a platinum tungsten wire or other developing enhancement materials.

[0055] In some embodiments, the elastic section 11 and the outer sheath 3 are developable materials. In this embodiment, tungsten powder can be added to the polymer material of the outer sheath 3 to enhance the developability, and the developability of the adjustable bend guide wire can be enhanced by performing developability enhancement treatment on the traction member 1, the elastic layer 2 located in the middle layer, and the outer sheath 3, so that the developability can be more obvious during angiography.

[0056] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with the technology to understand the content of the present application and implement it accordingly, and they cannot be used to limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit of the present application should be included in the protection scope of the present application.

[0057] It should be understood that the above description is for illustration and not for limitation. By reading the above description, many embodiments and many applications beyond the provided examples will be apparent to those skilled in the art. For comprehensive purposes, all articles and references, including the disclosures of patent applications and announcements, are incorporated herein by reference.

Claims

1. An adjustable curved guide wire, characterized in that: include: The main pipe body has a relative proximal end and a distal end, and an inner cavity running from the proximal end to the distal end, wherein a traction member is arranged in the inner cavity; the traction member has an elastic section, and the elastic section is attached to the distal end or close to the distal end, and the movement of the traction member drives the axial length of the elastic section to increase, and the main pipe body changes its own bending shape in response to the movement of the traction member.

2. The adjustable curved guide wire according to claim 1, characterized in that: The traction member further comprises a rigid section, the rigid section is connected to the elastic section, and the rigid section is passed through the proximal end of the main pipe body.

3. The adjustable curved guide wire according to claim 2, characterized in that: The elastic section is less flexible than the rigid section.

4. The adjustable curved guide wire according to claim 2, characterized in that: The elastic section and the rigid section are made of the same material, and the elastic section and the rigid section are integrally formed.

5. The adjustable curved guide wire according to claim 2, characterized in that: The elastic section is a spring, and the winding radius of the spring tends to decrease from the proximal end of the elastic section to the distal end of the elastic section.

6. The adjustable curved guide wire according to claim 1, characterized in that: The main pipe body comprises, from inside to outside, an elastic layer and an outer sheath, the traction member is arranged inside the elastic layer, and a hydrophilic coating is arranged on the outer surface of the outer sheath.

7. The adjustable curved guide wire according to claim 6, characterized in that: A channel tube is arranged between the elastic layer and the traction member, and the channel tube is used to isolate the elastic layer and the traction member.

8. The adjustable curved guide wire according to claim 6, characterized in that: The elastic layer comprises: a hypotube and a developing wire; the developing wire is wound around the outer surface of the hypotube, or the developing wire is embedded in the hypotube.

9. The adjustable curved guide wire according to claim 8, characterized in that: A thickness space is arranged on the outer surface of the hypotube, and the developing wire is wound in the thickness space and does not exceed the maximum outer diameter of the outer surface of the hypotube.

10. The adjustable curved guide wire according to claim 6, characterized in that: The elastic section and the outer sheath are of a developable material.

11. The adjustable curved guidewire according to claim 1, characterized in that: The utility model further comprises a handle connected to the proximal end of the main tube body, and the handle is configured to drive the traction member to move.

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