CN219355028U - Core wire structure and micro-guide wire - Google Patents

Abstract

The utility model relates to the technical field of medical equipment and provides a core wire structure and a micro-guide wire, wherein the core wire structure comprises: a core wire body; the coil spring is arranged at the far end of the core wire main body and is connected with the core wire main body, the coil spring comprises at least one core wire, and the coil spring is formed by screwing the core wire along the axial direction of the core wire main body. According to the core wire structure and the micro-guide wire provided by the utility model, the problem of how to improve the flexibility of the micro-guide wire is well solved.

Description

Core wire structure and micro-guide wire

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a core wire structure and a micro-guide wire.

Background

This section provides merely background information related to the present disclosure and is not necessarily prior art.

The micro-guide wire is an intravascular interventional diagnosis and treatment instrument, is used for providing a basic track for interventional instruments such as a catheter, a bracket, a balloon and the like, and guiding the basic track to a corresponding diagnosis and treatment area, and is an indispensable matching product for selectively entering intracranial vessels and the like in interventional operation.

Because the wall of the intracranial blood vessel is thinner than the arteries of other organs with the same caliber, the thickness of the intracranial blood vessel is only 1/10 of that of the small blood vessel of the heart or limbs, the intracranial blood vessel lacks an external elastic layer and an intermediate muscular layer and is more fragile than the peripheral blood vessel, and the intracranial blood vessel is mostly hung on the surface of the brain, and the risk that some blood vessels on the trunk are broken after being pulled by external force is high; the biggest difficulty is that the intracranial blood vessel is bent, and the conventional interventional devices such as guide wires, stents and the like are difficult to reach the treatment position.

The micro-guide wire in the prior art generally achieves the aim of improving the flexibility through radial size gradual change of the core wire, but the lifting space for improving the flexibility of the micro-guide wire through radial size gradual change of the core wire is limited.

For the above reasons, how to improve the flexibility of the micro-guide wire is a technical problem to be solved.

Disclosure of Invention

The utility model aims to at least solve the problem of how to improve the flexibility of a micro-guide wire. The aim is achieved by the following technical scheme:

the first aspect of the present utility model proposes a core wire structure comprising:

a core wire body;

the coil spring is arranged at the far end of the core wire main body and is connected with the core wire main body, the coil spring comprises at least one core wire, and the coil spring is formed by screwing the core wire along the axial direction of the core wire main body.

According to the core wire structure provided by the utility model, the coil spring which is formed by the spiral along the axial direction of the core wire main body is arranged at the distal end of the core wire main body, and the coil spring can be bent and deformed in the radial direction so as to be used for improving the flexibility of the micro-guide wire, and even in the case of intracranial vascular bending, the micro-guide wire can smoothly reach a treatment part.

In conclusion, the core wire structure provided by the utility model well solves the problem of how to improve the flexibility of the micro-guide wire.

In addition, the core wire structure according to the utility model can also have the following additional technical features:

in some embodiments of the utility model, the coil spring is integrally formed with the core wire body and is formed by the distal end of the core wire body being threaded in the axial direction of the core wire body.

In some embodiments of the utility model, the radial cross-sectional shape of the core wire body is at least one of quadrilateral, triangular, or circular.

In some embodiments of the present utility model, the core wire body includes a proximal core wire body and a distal core wire body, the proximal core wire body and the distal core wire body are butted, a radial dimension of the proximal core wire body is greater than or equal to a radial dimension of the distal core wire body, and the coil spring is disposed at a distal end of the distal core wire body.

In some embodiments of the utility model, the core wire structure further comprises a hydrophobic coating applied to all of the outer surface of the proximal core wire body and the outer surface of the distal core wire body proximal thereto, and the hydrophobic coating covers the junction of the proximal core wire body and the distal core wire.

In some embodiments of the present utility model, the distal core wire body includes a first transition portion, a second transition portion, a connection portion, and a body portion, wherein the coil spring, the first transition portion, the second transition portion, the connection portion, and the body portion are sequentially connected along an axial direction in which the distal end is directed toward the proximal end, and the body portion is butted with the proximal core wire body.

In some embodiments of the utility model, the radial cross-sectional dimensions of the first transition, the second transition, and the connecting portion increase gradually along an axial direction that points distally toward the proximal end.

In some embodiments of the utility model, the core wire structure further comprises a guide head disposed at a distal end of the coil spring.

The second aspect of the utility model provides a micro-guide wire, which comprises the core wire structure as described in any one of the above, and further comprises a buffer spring, wherein the buffer spring is sleeved outside the spiral spring, one end of the buffer spring is connected with the distal end of the spiral spring, and the other end of the buffer spring is connected with the outer peripheral surface of the core wire main body.

In some embodiments of the utility model, the distal end of the buffer spring is provided with a developing portion.

The micro-guide wire according to the present utility model and the core wire structure according to the present utility model have the same advantages and are not described here again.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 schematically shows a schematic structural view of a core wire structure in accordance with an embodiment of the present utility model;

fig. 2 schematically shows a schematic structural view of a coil spring according to an embodiment of the present utility model;

FIG. 3 schematically illustrates a cross-sectional view of a first transition in accordance with some embodiments of the utility model;

FIG. 4 schematically illustrates a cross-sectional view of a first transition in accordance with further embodiments of the present utility model;

FIG. 5 schematically shows a schematic structural view of a micro-wire according to an embodiment of the present utility model;

fig. 6 schematically shows an enlarged schematic a according to fig. 5;

fig. 7 schematically shows a usage effect of the micro-guide wire according to the embodiment of the present utility model.

Reference numerals illustrate:

100 is a micro-guide wire, 10 is a core wire structure, 20 is a buffer spring, 30 is a developing part, 40 is a high polymer coating, and 50 is a hydrophilic coating;

1 is a core wire main body, 11 is a proximal core wire main body, 12 is a distal core wire main body, 121 is a first transition part, 122 is a second transition part, 123 is a connecting part, 1231 is an arc surface, and 124 is a main body part;

2 is a spiral spring;

3 is a guide head;

4 is a hydrophobic coating.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In the present application, a range expressed by "one value to another value" is a general expression which avoids the specification from listing all the values in the range. Thus, recitation of a particular numerical range includes any numerical value within that range, as well as the smaller numerical range bounded by any numerical value within that range, as if the any numerical value and the smaller numerical range were written in the specification in the clear.

In this application, the end that is closer to the operator when used is referred to as the "proximal end", the end that is farther from the operator is referred to as the "distal end", and the "proximal end" and "distal end" of any of the components of the core wire structure 10 (or the microcatheter 100) are defined in accordance with this principle. "axial" generally refers to the length of the core wire structure 10 (or the microcatheter 100) as it is delivered, and "radial" generally refers to the direction of the core wire structure 10 (or the microcatheter 100) perpendicular to its "axial" and defines the "axial" and "radial" of any component of the core wire structure 10 (or the microcatheter 100) in accordance with this principle.

Referring to fig. 1-2, a first aspect of the present utility model provides a core wire structure 10 comprising: the core wire comprises a core wire body 1 and a spiral spring 2, wherein the spiral spring 2 is arranged at the far end of the core wire body 1 and is connected with the core wire body 1, the spiral spring 2 comprises at least one core wire, and the spiral spring 2 is formed by spirally winding the core wire along the axial direction of the core wire body 1.

According to the core wire structure 10 of the present utility model, by providing the coil spring 2 which is formed by being screwed in the axial direction of the core wire body 1 at the distal end of the core wire body 1, the coil spring 2 can be bent and deformed in the radial direction for improving the flexibility of the micro-wire 100, and the micro-wire 100 can smoothly reach the treatment site even in the case of intracranial vascular bending.

Referring to fig. 1, the coil spring 2 and the core wire body 1 are integrally formed, and is formed by screwing the distal end of the core wire body 1 along the axial direction of the core wire body 1.

The radial cross section of the core wire of the coil spring 2 is one of quadrangle, triangle or circle, preferably, referring to fig. 2, the radial cross section of the core wire is quadrangular, the core wire is selected from nickel-titanium alloy wires, the nickel-titanium alloy wires are ground to be 0.10-0.15mm diameter by a precise centerless grinder, then processed to be in the form of quadrangular by a precise numerical control grinder, and then wound on a die with the diameter of 0.15-0.25mm for heat treatment and shaping, and finally the coil spring 2 is formed.

Referring to fig. 1, the guiding head 3 is disposed at the distal end of the coil spring 2 to perform guiding function, the guiding head 3 is also a core wire made of nitinol, and the radial cross-section of the guiding head 3 is one of quadrilateral, triangular or circular; preferably, the guide head 3 is a quadrangular prism, the radial section shape of the guide head is quadrangular, the nickel-titanium alloy wire is ground to be 0.05-0.10mm diameter through a precise centerless grinder, and then the nickel-titanium alloy wire is punched to be the quadrangular prism through a precise punch, and the length of the guide head 3 is 10-20mm.

Referring to fig. 1, specifically, the core wire main body 1 includes a proximal core wire main body 11 and a distal core wire main body 12, where the proximal core wire main body 11 and the distal core wire main body 12 are butted, and the butt joint mode is preferably seamless butt joint by solid state welding, so that the flexibility of the distal end and the supportability of the proximal end of the core wire structure 10 are ensured; the butt joint mode can also be to add filling transition materials such as pure nickel, niobium, vanadium and the like in the middle, and a laser welding or microbeam plasma welding mode is used to ensure the mechanical properties of butt joint welding seams of the core wire structure 10.

The radial dimension of the proximal core wire body 11 is equal to or greater than the radial dimension of the distal core wire body 12 for increasing the pushability of the core wire structure 10.

The material of the proximal core wire main body 11 is stainless steel, the material of the distal core wire main body 12 is nickel-titanium alloy, the proximal core wire main body 11 is cylindrical, the length is 1500-1600mm, the nickel-titanium alloy at the distal end can improve the softness and durability of the micro-guide wire 100, the super-elasticity of the nickel-titanium alloy can ensure that the micro-guide wire 100 is repeatedly pushed in a blood vessel and is not easy to deform and damage, the tensile strength of the stainless steel material at the proximal end is high, the supporting capability of the proximal end of the micro-guide wire 100 in the blood vessel can be ensured, and the guiding of related catheters, stents, balloons and other interventional instruments is facilitated to establish a passage.

With continued reference to fig. 1, the outer surfaces of all the proximal core wire main body 11 and the outer surface of the distal core wire main body 12 near the proximal end are coated with a hydrophobic coating 4, and the hydrophobic coating 4 may be a material such as Polytetrafluoroethylene (PTFE) commonly used for reducing friction resistance, effectively ensuring the operability of the micro-guide wire 100, and improving tracking performance; meanwhile, the hydrophobic coating 4 also covers the joint of the proximal core wire main body 11 and the distal core wire main body 12, so as to protect the joint, isolate the air environment and avoid corrosion.

Referring to fig. 1, specifically, the distal core wire body 12 includes a first transition portion 121, a second transition portion 122, a connection portion 123, and a main body portion 124, and along an axial direction in which the distal end points to the proximal end, the coil spring 2, the first transition portion 121, the second transition portion 122, the connection portion 123, and the main body portion 124 are sequentially connected, the first transition portion 121 and the coil spring 2 are in an integral structure, and the coil spring 2 is formed by the first transition portion 121 being screwed in the axial direction of the core wire body 1; the main body 124 is butted with the proximal core wire main body 11, the main body 124 is a round table, and the diameter of the distal end of the main body 124 is the same as that of the proximal core wire main body 11, so as to ensure the pushing performance of the micro-guide wire 100, and the outer surfaces of all the main body 124 are coated with the hydrophobic coating 4.

The first transition portion 121 is smoothly connected with the second transition portion 122, the second transition portion 122 is smoothly connected with the connecting portion 123, and the connecting portion 123 is smoothly connected with the main body portion 124, so that the outer surface of the micro-guide wire 100 is smooth, the risk of damaging the inner wall of a blood vessel is reduced, the pushing performance of the micro-guide wire 100 can be improved, and the size and the shape of the proximal end face of the first transition portion 121 are the same as those of the distal end face of the second transition portion 122.

Further, along the axial direction of the distal end pointing to the proximal end, the radial cross-sectional dimensions of the first transition portion 121, the second transition portion 122, the connecting portion 123, and the main body portion 124 gradually increase, and the gradually changed combination forms the pushing performance and the flexibility of the core wire structure 10 to be better.

The first transition portion 121, the second transition portion 122, the connecting portion 123, and the main body portion 124 are all made of nitinol.

In some embodiments of the present utility model, as shown in fig. 1 and 3, the first transition portion 121 is in the shape of a quadrangular prism, the second transition portion 122 is in the shape of a trapezoidal table, the connecting portion 123 is in the shape of a circular table, that is, the radial cross-sectional shape of the first transition portion 121 is a quadrangle, the radial cross-sectional shape of the second transition portion 122 is also a quadrangle, the radial cross-sectional shape of the connecting portion 123 is a circle, and since the proximal end of the second transition portion 122 is a quadrangle, the connection between the proximal end of the second transition portion 122 and the distal end of the connecting portion 123 is not smooth, and therefore, an arc surface is processed at the proximal end of the connecting portion 123 for smoothly connecting the proximal end of the second transition portion 122 and the connecting portion 123.

Because the main body 124 is a cylinder, the distal end face of the connecting portion 123 and the proximal end face of the main body 124 have the same diameter and the same shape, and the cross-sectional shape is circular, so as to ensure the pushing performance and the flexibility of the micro-guide wire 100; and the proximal surface of the body portion 124 has the same diameter and shape as the distal surface of the proximal core wire body 11 to ensure the push performance and flexibility of the micro-guide wire 100.

The first transition part 121 is ground by a nickel-titanium alloy wire through a precise centerless grinder, the angle of a grinding wheel is 15-30 degrees, the grinding wheel is ground to be 0.15-0.20mm in diameter, and then the grinding wheel is processed to be a quadrangular prism through a precise numerical control milling machine, and the length of the quadrangular prism is 300-320mm; the second transition part 122 is ground by a nickel-titanium alloy wire through a precise centerless grinder, the angle of a grinding wheel is adjusted to be 30-45 degrees, the grinding wheel is ground to be in conical transition with the diameter of 0.20-0.30mm, and then the conical transition part is processed to be a trapezoid table through a precise numerical control milling machine, wherein the length of the trapezoid table is 140-160mm; the connecting part 123 and the main body part 124 are all round platform transition of grinding wheel angle of 30-45 degrees to 0.30-0.36mm diameter by nickel titanium alloy wires through a precise centerless grinder, and the total length of the connecting part 123 and the main body part 124 is 40-60mm.

Referring to fig. 2-4, in some embodiments of the present utility model, the radial cross-sectional shape of the first transition portion 121 and the radial cross-sectional shape of the second transition portion 122 may be, without limitation, one of triangle or circle, and fig. 4 is a schematic diagram of the radial cross-sectional shape of the first transition portion 121 as triangle, and may also be a schematic diagram of the radial cross-sectional shape of the second transition portion 122.

Referring to fig. 5, a micro-guide wire 100 according to a second aspect of the present utility model includes a core wire structure 10 as described above, and further includes a buffer spring 20, wherein the buffer spring 20 is sleeved outside the coil spring 2, one end of the buffer spring 20 is connected to a distal end of the coil spring 2, the other end of the buffer spring 20 is connected to an outer peripheral surface of the core wire main body 1, and a developing portion 30 is disposed at the distal end of the buffer spring 20; more specifically, the coil spring 2, the first transition portion 121, the second transition portion 122, and the portion of the connecting portion 123 are all located inside the buffer spring 20.

When the distal end of the coil spring 2 is not provided with the guide head 3, one end of the buffer spring 20 is connected to the distal end of the coil spring 2, and in another embodiment of the present utility model, referring to fig. 6, if the distal end of the coil spring 2 is provided with the guide head 3, one end of the buffer spring 20 should be connected to the distal end of the guide head 3.

It will be appreciated that the use of the buffer spring 20 can further enhance the bending and restoring properties of the micro-wire 100 and increase the metal volume per unit length thereof, ensuring the radiation detectability of the micro-wire 100 in the blood vessel.

With continued reference to fig. 6, in some embodiments of the utility model, the proximal end of the cushion spring 20 is attached to the outer peripheral surface of the attachment portion 123 by means including, but not limited to, welding or adhesive bonding.

With continued reference to fig. 6, further, a polymer coating 40 is disposed on the outer side surface of the buffer spring 20, where the polymer coating 40 is preferably a polyurethane coating, and the buffer spring 20 is coated with the polyurethane coating, so as to further fix the connection strength between the core wire body 1 and the buffer spring 20, improve the smoothness of the surface of the buffer spring 20, and reduce the risk of damaging the inner wall of the blood vessel.

As shown in fig. 6 and 7, further, a hydrophilic coating 50 is further provided on the outer surface of the polymer coating 40, and the hydrophilic coating 50 further improves the lubricity of the micro-guide wire 100, and reduces the surface friction force to ensure that the distal end of the micro-guide wire 100 can be pushed smoothly in a tiny and tortuous blood vessel.

The micro guide wire 100 according to the present utility model has the same advantages as the core wire structure 10 according to the present utility model, and will not be described again here.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. A core wire structure comprising:

a core wire body;

the coil spring is arranged at the far end of the core wire main body and is connected with the core wire main body, the coil spring comprises at least one core wire, and the coil spring is formed by screwing the core wire along the axial direction of the core wire main body.

2. The core wire structure according to claim 1, wherein the coil spring is of an integral structure with the core wire body and is formed by a distal end of the core wire body being screwed in an axial direction of the core wire body.

3. The core wire structure of claim 1, wherein the radial cross-sectional shape of the core wire body is at least one of quadrilateral, triangular, or circular.

4. The core wire structure according to claim 1, wherein the core wire body comprises a proximal core wire body and a distal core wire body, the proximal core wire body and the distal core wire body are abutted, a radial dimension of the proximal core wire body is equal to or greater than a radial dimension of the distal core wire body, and the coil spring is disposed at a distal end of the distal core wire body.

5. The core wire structure of claim 4, further comprising a hydrophobic coating applied to all of the outer surface of the proximal core wire body and the outer surface of the distal core wire body proximal thereto, and wherein the hydrophobic coating covers the junction of the proximal core wire body and the distal core wire.

6. The core wire structure of claim 4, wherein the distal core wire body comprises a first transition portion, a second transition portion, a connecting portion, and a body portion, wherein the coil spring, the first transition portion, the second transition portion, the connecting portion, and the body portion are sequentially connected along an axial direction in which the distal end is directed toward the proximal end, and wherein the body portion and the proximal core wire body are abutted.

7. The core wire structure of claim 6, wherein the radial cross-sectional dimensions of the first transition, the second transition, and the connecting portion progressively increase along the axial direction of the distal end toward the proximal end.

8. The core wire structure of claim 1, further comprising a guide head disposed at a distal end of the coil spring.

9. A micro-guide wire, characterized by comprising the core wire structure according to any one of claims 1-8, and further comprising a buffer spring, wherein the buffer spring is sleeved outside the spiral spring, one end of the buffer spring is connected with the distal end of the spiral spring, and the other end of the buffer spring is connected with the outer peripheral surface of the core wire main body.

10. The microcatheter of claim 9, wherein the distal end of the buffer spring is provided with a developing portion.