CN113084341A

CN113084341A - Guide wire, welding device and welding method

Info

Publication number: CN113084341A
Application number: CN201911320083.1A
Authority: CN
Inventors: 王杰; 李郴飞
Original assignee: Lifetech Scientific Shenzhen Co Ltd
Current assignee: Lifetech Scientific Shenzhen Co Ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2021-07-09
Also published as: WO2021121293A1

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to a guide wire, a welding device and a welding method. The guide wire comprises a core wire and a first spring, wherein the first spring is sleeved outside the core wire, the near end of the first spring is connected with the core wire through a welding seam formed by welding, and the track of the welding seam is overlapped with at least one part of spiral line track of the first spring. According to the guide wire disclosed by the invention, the core wire and the first spring are connected through the spiral welding seam generated in a welding mode, and the track of the welding seam is ensured to be overlapped with at least one part of spiral line track of the first spring, so that the welding length between the core wire and the first spring can be increased, the welding seam is obviously lengthened, and the welding strength of the core wire and the first spring can be effectively improved. In addition, the smoothness of the welding seam between the core wire and the first spring is effectively improved, the existence of bulges in the welding seam is reduced or avoided, the reliability of the guide wire in the use process is improved, and the use risk of the guide wire in an interventional operation is reduced.

Description

Guide wire, welding device and welding method

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to a guide wire, a welding device and a welding method.

Background

Minimally invasive endovascular interventional therapy has been widely developed in recent years as an emerging medical advance, which is a process of selectively delivering interventional medical devices to many important organs and parts of the human body through blood vessels or body lumens under the monitoring of medical imaging equipment, such as: the heart, liver, brain, kidney, digestive system, and reproductive system, and thus important techniques and methods for diagnosis and treatment, have the advantages of no need for surgery, less trauma, and relatively low medical costs.

In the interventional diagnosis and treatment process, the guide wire is used as an important instrument for guiding various catheters and interventional instruments to reach a target position, and plays an indispensable and irreplaceable role in path exploration, leading deflection, guiding forward movement and the like. The function of a guidewire during endovascular interventions is to access the main passageway, branches and tortuous portions of the lumen of a vessel, sometimes requiring a breakthrough through the stenosis to the target site, and then to guide a catheter, microcatheter or other interventional instrument to the target area within the body. Stainless steel guide wires, which have high hardness, torsional strength and good tactile feedback characteristics, are commonly used as stiffened guide wires or ultra-hard guide wires. The superhard guide wire is used for providing a guide function for an interventional device to reach a designated position and assisting in accurately positioning the implanted device when the implanted device is released in a blood vessel.

The ideal superhard guide wire is required to have good pushing, twisting, supporting and controlling properties from the performance aspect, smoothly passes through a twisted blood vessel, is not easy to deform after bending when passing through and pushing the blood vessel, does not damage the blood vessel, and is smoothly matched with a corresponding interventional instrument for use. However, in the outer spring welding of the existing superhard guide wire, the outer spring and the core wire are welded in a ring mode, and the track is a circle along the circumferential direction of the core wire. Circular welding is generally adopted at present because circular girth welding is simple to realize and low in cost. Circular girth welding, the welding seam orbit is not overlapped with the spiral orbit of outer spring coiling, can't weld the outermost round of outer spring near-end and core wire evenly. The welding seam is not smooth in transition and low in welding strength, and a bulge is formed between the welding seam and the outer-layer spring. The bulge is formed by welding only one part of the outermost spring in the axial direction and sinking, and the unwelded part is the bulge. Further, the guide wire is likely to scratch the blood vessel during the interventional operation, and the unsmooth surface of the guide wire may also stimulate the blood vessel to cause vasospasm, and may also cause problems such as breakage of the guide wire.

Disclosure of Invention

The invention aims to at least solve the problems that the guide wire is easy to scratch blood vessels and cause vasospasm and the like caused by annular welding adopted in the welding process of an outer-layer spring of the existing guide wire.

A first aspect of the invention provides a guidewire comprising:

core yarn;

the first spring is sleeved outside the core wire, the near end of the first spring is connected with the core wire through a welding seam formed by welding, and the track of the welding seam is overlapped with at least one part of spiral line track of the first spring.

According to the guide wire disclosed by the invention, the core wire and the first spring are connected through the welding seam generated in a welding mode, and the track of the welding seam is ensured to be overlapped with at least one part of spiral line track of the first spring. In addition, welding is carried out along the spiral line of the first spring, so that the smoothness of a welding seam between the core wire and the first spring is effectively improved, the existence of bulges in the welding seam is reduced or avoided, the reliability of the guide wire in the use process is improved, and the use risk of the guide wire in an interventional operation is reduced.

In addition, the guide wire according to the invention can also have the following additional technical characteristics:

in some embodiments of the invention, the first spring has a first helical turn closest to its proximal end, the first helical turn being connected to the core wire by a helical weld formed by welding.

In some embodiments of the invention, and from the proximal end of the first spring, the helical path of the first spring is at least one turn around the outer circumference of the core wire.

In some embodiments of the invention, the ratio of the width of the weld to the width of the first spring is 1:1 to 1.5: 1.

In some embodiments of the invention, the guidewire further comprises a second spring, the second spring is sleeved outside the core wire from the distal end to the proximal end of the core wire, and the second spring is located between the first spring and the core wire.

In some embodiments of the present invention, the core wire includes a body portion and a tapered connecting portion, the connecting portion is disposed at a distal end of the body portion, the connecting portion includes a first mounting section and a second mounting section, a distal end of the first mounting section is connected to a proximal end of the second mounting section, a maximum outer diameter of the second mounting section is smaller than or equal to a minimum outer diameter of the first mounting section, a proximal end of the first spring abuts against the first mounting section, and a proximal end of the second spring abuts against the second mounting section.

In some embodiments of the invention, the first spring and the outer peripheral surface of the body portion are both provided with a PTFE coating.

In another aspect of the present invention, a welding device is provided for manufacturing a guide wire according to any one of the above embodiments, wherein the welding device includes:

a machine base;

the fixing unit is arranged on the base and used for fixing a core wire externally sleeved with a first spring and driving the core wire and the first spring to rotate;

the welding unit is arranged on the base and comprises a welding gun, and the welding gun can move in a plane relative to the core wire;

the control unit is used for controlling the fixing unit to drive the core wire and the first spring to rotate according to a preset control program, controlling the welding gun or the fixing unit to move according to a preset track, and simultaneously controlling the welding gun to weld the first spring and the core wire so as to form a spiral welding seam on the first spring, wherein the track of the welding seam is overlapped with at least one part of spiral line track of the first spring.

In another aspect of the present invention, a welding method is further provided, where the welding method uses the welding device described above to perform welding, and includes the following steps:

fixing a core wire, the outer part of which is sleeved with a first spring, on a fixing unit;

moving the fixing unit or/and the welding unit to align a welding gun of the welding unit with a proximal end of the first spring;

the control unit drives the fixing unit to drive the core wire to rotate, controls the welding gun or the fixing unit to move according to a preset track, and controls the welding gun to weld the first spring and the core wire simultaneously, so that the track of a welding seam formed after welding is overlapped with at least one part of spiral line track of the first spring.

In some embodiments of the present invention, the step of fixing the core wire externally sleeved with the first spring to the fixing unit specifically includes the steps of:

sleeving the first spring outside the core wire from the far end to the near end of the core wire until the near end of the first spring abuts against the core wire;

the near end of the core wire sleeved with the first spring penetrates through a fixed chuck on a fixed seat of the fixed unit until the far end of the core wire abuts against a supporting seat of the fixed unit;

and the core wire is fixed on the fixed seat through the fixed chuck.

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 invention. Also, like parts are designated by like reference numerals throughout the drawings. Wherein:

FIG. 1 is a schematic view of a portion of a guidewire according to an embodiment of the present invention;

FIG. 2 is an exploded view of the guidewire of FIG. 1;

FIG. 3 is an enlarged view of portion A of FIG. 1;

FIG. 4 is an enlarged view of the portion B of FIG. 1;

FIG. 5 is a schematic view of a part of a welding apparatus according to an embodiment of the present invention;

fig. 6 is a partial schematic view of another view of the welding device of fig. 5.

The reference numerals in the drawings denote the following:

10: a guide wire;

11: core wire, 111: body portion, 112: connection portion, 1121: first mounting section, 1122: second mounting section, 1123: straight line segment, 113: PTFE coating, 12: first spring, 13: weld, 14: a second spring;

20: a welding device;

21: base, 211: base, 212: support, 22: first mount, 23: fixing unit, 231: bottom plate, 232: fixing seat, 2321: fixed chuck, 233: support seat, 2331: supporting block, 24: welding gun, 25: and a second mounting seat.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can 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 invention 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" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "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 specifically identified as an order of performance. It should also be understood 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 convenience 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 … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

For ease of description, the following description uses the terms "proximal" and "distal", where "proximal" refers to the end proximal to the operator and "distal" refers to the end distal from the operator, the phrase "axial direction" being understood herein to mean the direction in which the present guidewire is advanced and pushed out, the direction perpendicular to the "axial direction" being defined as the "radial direction", the phrase "length direction" being understood as the direction in which the physical dimension of the guidewire is the longest, and the direction perpendicular to the "length direction" being defined as the "radial direction".

Fig. 1 is a schematic view of a partial structure of a guidewire 10 according to an embodiment of the present invention. Fig. 2 is an exploded view of the guidewire 10 of fig. 1. Fig. 3 is an enlarged schematic view of a portion a in fig. 1. As shown in fig. 1, 2 and 3, a first aspect of the present invention proposes a guide wire 10, the guide wire 10 including a core wire 11 and a first spring 12. The first spring 12 is sleeved outside the core wire 11, the proximal end of the first spring 12 is connected with the core wire 11 through a welding seam 13 formed by welding, and the track of the welding seam 13 is overlapped with at least a part of the spiral track of the first spring 12.

In this embodiment, the first spring 12 is sleeved on the distal end of the core wire 11, and the welding seam 13 is located on the proximal end of the first spring. In other embodiments, the first spring 12 may further be disposed on the middle section of the core wire 11, even on the entire core wire 11. Accordingly, the weld 13 may be located at other locations of the first spring 12, such as the middle section, or even the entire length of the first spring 12, in addition to the proximal end of the first spring 12.

According to the guide wire 10 of the present invention, the core wire 11 and the first spring 12 are connected by the weld 13 generated by welding, and the trajectory of the weld 13 is ensured to overlap with at least a part of the spiral trajectory of the first spring 12, so that the welding length between the core wire 11 and the first spring 12 can be increased, the weld 13 can be significantly lengthened, and the welding strength between the core wire 11 and the first spring 12 can be effectively improved, compared with the conventional annular welding along the circumferential direction of the guide wire. In addition, welding is carried out along the spiral line of the first spring 12, so that the smoothness of the welding seam 13 between the core wire 11 and the first spring 12 is effectively improved, the existence of bulges in the welding seam 13 is reduced or avoided, the reliability of the guide wire 10 in the use process is improved, and the use risk of the guide wire 10 in an interventional operation is reduced.

In some embodiments of the present invention, as shown in fig. 1 and 2, the guidewire 10 further comprises a second spring 14, wherein the second spring 14 is sleeved outside the distal end of the core wire 11 from the distal end of the core wire 11 towards the proximal end and is positioned between the first spring 12 and the core wire 11.

The second spring 14 is sleeved on the distal end of the core wire 11, and the distal end of the second spring 14 is flush with the distal end of the core wire 11. The first spring 12 is sleeved outside the second spring 14 and the core wire 11, the distal end of the first spring 12 is flush with the distal end of the core wire 11, and the distal end of the first spring 12, the distal end of the second spring 14 and the distal end of the core wire 11 are fixedly connected by welding, as shown in fig. 4, so that the second spring 14 is wrapped between the first spring 12 and the core wire 11. The length of the first spring 12 is greater than the length of the second spring 14, and the proximal end of the first spring 12 is closer to the proximal end of the guidewire 10 than the proximal end of the second spring 14. The second spring 14 is provided to provide visualization of the guidewire 10 so that the position of the distal end of the guidewire 10 can be discerned by viewing the position of the second spring 14, thereby facilitating the intraoperative manipulation of the guidewire 10. The second spring 14 is generally made of a material having developing properties such as a gold wire.

As shown in fig. 2, the core wire 11 includes a body portion 111 and a tapered connecting portion 112, and the connecting portion 112 is provided at a distal end of the body portion 111. The connecting portion 112 includes a first mounting section 1121 and a second mounting section 1122, and a distal end of the first mounting section 1121 is connected to a proximal end of the second mounting section 1122. The maximum outer diameter of the second mounting section 1122 is less than or equal to the minimum outer diameter of the first mounting section 1121. The proximal end of the first spring 12 abuts against the first mounting section 1121, and the proximal end of the second spring 14 abuts against the second mounting section 1122, so as to improve the stability of the first spring 12 fixed on the core wire 11, which is beneficial to improving the welding precision. Because the first spring 12 and the second spring 14 are both sleeved outside the core wire 11, and the proximal ends thereof are both abutted against the core wire 11, the coaxiality of the first spring 12 and the second spring 14 can be effectively ensured.

In order to limit the insertion depth of the first spring 12 and the second spring 14 from the distal end to the proximal end of the core wire 11 and to improve the connection strength between the first spring 12 and the second spring 14 and the core wire 11, the first mounting section 1121 and the second mounting section 1122 are tapered. To further control the insertion depth of the first and

second springs

12, 14 from the distal end to the proximal end of the core wire 11, a straight line segment 1123 is provided between the first and

second mounting segments

1121, 1122, and the insertion depth of the second spring 14 from the distal end to the proximal end of the core wire 11 is controlled by setting the length of the straight line segment 1123 to adjust the taper of the second mounting segment 1122.

Wherein, the material of first spring 12 can be SUS304V stainless steel, and the surface has PTFE (polytetrafluoroethylene) coating to prevent first spring 12 from taking place corruption or oxidation in long-term use, improve the reliability in the art. The first spring 12 is formed by spirally winding a thin flat wire. The PTFE coating 113 is also provided on the outer peripheral surface of the main body 111, and the connecting portion 112 connected to the first spring 12 is not provided with a coating. After the first spring 12 is sleeved on the core wire 11, since the inner diameter of the first spring 12 is smaller than the outer diameter of the first mounting section 1121, the proximal end of the first spring 12 abuts against the first mounting section 1121 and is positioned on the tapered surface of the first mounting section 1121. During assembly, the first spring 12 is sleeved on the far end of the core wire 11 and is pushed towards the near end of the core wire 11 forcibly until the first spring 12 cannot slide, and partial structure of the first spring 12 is melted by laser welding under the protection of argon gas to form a welding seam 13, so that the first spring 12 is fixedly connected with the core wire 11.

As shown in fig. 3, the first coil of the first spring 12 is located at the outermost turn of the proximal end of the first spring 12, and in order to prevent the end of the first coil of the first spring 12 from scratching blood vessels or other tissues during the operation, the first coil of the first spring 12 and the outer circumferential surface of the core wire 11 are welded to form a spiral-shaped weld smoothly transitionally connected with the core wire 11, so that the end of the first coil is connected to the core wire 11 without a significant protruding part.

Only one half turn of the weld 13 is shown in fig. 3, and the other half turn of the weld 13 hidden by the first mounting segment 1121 is not shown in fig. 3. In other embodiments of the present invention, a plurality of turns may be welded around the outer circumference of the core wire 11 along the helical path of the proximal end of the first spring 12 to form a continuous multi-turn weld 13, thereby further improving the strength of the connection of the first spring 12 to the core wire 11.

In some embodiments of the invention, the ratio of the width of the weld 13 to the width of the thin flat wire from which the first spring 12 is made is 1:1 to 1.5:1, so that the width of the weld 13 formed after welding can provide sufficient stability support for the connection between the first spring 12 and the core wire 11, while reducing the occurrence of bulges during welding.

In another aspect of the present invention, a welding device 20 is provided for welding and manufacturing the guide wire 10 of any of the above embodiments. Fig. 5 is a partial structural view of a welding device 20 according to an embodiment of the present invention, and fig. 6 is a partial structural view of another view of the welding device 20 in fig. 5. As shown in fig. 5 and 6, the welding apparatus 20 includes a stand 21, a fixing unit 23, a welding unit, and a control unit. The fixing unit 23 can also move left and right in the X-axis direction. The fixing unit 23 is arranged on the base 21, and the fixing unit 23 is used for fixing the core wire 11 externally sleeved with the first spring 12 and can drive the core wire 11 and the first spring 12 to rotate around the central axis of the core wire 11. The welding unit is provided on the base 21, and includes a welding torch 24, and the welding torch 24 is movable in a three-dimensional coordinate system, such as up and down movement along the Z axis and left and right movement along the X axis, and back and forth movement along the Y axis, with respect to the guide wire 10. The three-dimensional coordinate system comprises an XY plane coordinate system, an XZ plane coordinate system and a YZ plane coordinate system. The welding gun 24 performs welding of the first spring 12 and the core wire 11 using a laser.

The control unit comprises a controller respectively connected with the fixing unit 23 and the welding unit, and the control unit is used for controlling the fixing unit 23 to drive the core wire 11 and the first spring 12 to rotate according to a preset control program, controlling the welding gun 24 or the fixing unit 23 to move according to a preset track, and simultaneously controlling the welding gun 24 to weld the first spring 12 and the core wire 11 so as to form a spiral welding seam 13 on the first spring 12, wherein the track of the welding seam 13 is overlapped with at least one part of the spiral track of the first spring 12.

Specifically, the housing 21 includes a base 211 and a frame 212 that are vertically disposed. The fixing unit 23 is connected to the base 211 through a first mounting seat 22, and the welding unit is connected to the frame 212 through a second mounting seat 25. The fixing unit 23 can move in the front-back direction, i.e., along the Y-axis, along the longitudinal direction of the first mounting base 22. The second mounting base 25 can drive the welding unit to move along the transverse direction of the rack 212, namely the movement along the X axis, and the second mounting base 25 can also drive the welding unit to move along the vertical direction of the rack 212, namely the movement along the Z axis. First mount pad 22 and second mount pad 25 all constitute through accurate screw nut, slip table, accurate guide rail to by servo motor control, servo motor drives screw nut and converts rotary motion into the linear motion along first mount pad 22 or second mount pad 25. And a sliding table is arranged on the screw rod nut and guided by a precise guide rail. The servo motor is controlled by a PLC (Programmable Logic Controller) system to form a closed-loop control system, which can precisely control the sliding position of the sliding table, thereby realizing accurate positioning of the first mounting seat 22 and the second mounting seat 25.

The fixing unit 23 includes a base 231, a fixing seat 232, and a supporting seat 233. The fixing seat 232 is provided with a through hole allowing the core wire 11 to pass through and a fixing chuck 2321 for fixing the core wire 11, the core wire 11 is clamped by the fixing chuck 2321 so as to prevent the core wire 11 from moving along the axial direction, and meanwhile, the fixing chuck 2321 can rotate through being in driving connection with the servo motor so as to drive the core wire 11 to rotate together. The servo motor and the closed-loop control system are adopted to control the fixed chuck 2321 to rotate, so that the angle control of 0.002 +/-0.0001 rad can be accurately realized, the relative position of a welding point of the welding gun 24 and the first spring 12 can be accurately adjusted in the three-dimensional direction, and the accurate coincidence of the track of the welding point and the track of the spiral line of the first spring 12 is ensured.

The support seat 233 is provided with a support block 2331 disposed opposite to the fixed chuck 2321. The support block 2331 can fix and support the distal end of the core wire 11, on which the first spring 12 is mounted, to assist the core wire 11 to rotate, and prevent the core wire 11 from moving during the rotation, thereby further ensuring that the trace of the welding point is precisely matched with the trace of the spiral line of the first spring 12.

In some embodiments of the present invention, the welding unit further includes a high-power electron microscope, and the high-power electron microscope captures the position and condition of the welding point in real time to determine the real-time welding effect, so as to ensure the controllability and accuracy of the welding process.

The spot size of the welding gun 24 is adjusted to be 1 to 1.5 times of the width of the first spring 12 during welding, so that the width of the welding seam 13 formed after welding can bring sufficient stable support for the connection between the first spring 12 and the core wire 11, and meanwhile, the generation of bulges in the welding process is reduced. By adjusting the laser output power of the welding gun 24 and simultaneously starting argon protection during welding, the quality of the welding seam 13 is ensured, the depth of the welding seam 13 is controlled, the damage to the core wire 11 in the welding process is reduced, and the guide wire 10 is ensured to have enough bending performance. By programming a control program, the core wire 11 is controlled to rotate along the central axis of the core wire 11 along with the fixed chuck 2321, and meanwhile, the welding gun 24 (or the fixed unit 23 drives the core wire 11) to do translation motion on the X axis is controlled, so that the track of the welding seam 13 is overlapped with at least a part of spiral line track of the first spring 12, the width and the depth of the welding seam 13 are ensured to be uniform, and the welding is reliable and stable.

In another aspect of the present invention, a welding method is further provided, in which the core wire 11 and the first spring 12 are welded by using the welding device 20 of the above embodiment, so as to obtain the guide wire 10 of any of the above embodiments. Hereinafter, the welding method will be described in detail by taking the welding of the first coil of the first spring 12 and the core wire 11 as an example, and includes the following steps:

and S1, sleeving the first spring 12 on the outside of the core wire 11 from the distal end of the core wire 11 until the proximal end of the first spring 12 abuts against the core wire 11. If the first spring 12 is long, the portion of the distal end of the first spring 12 protruding beyond the distal end of the core wire 11 may be cut off so that the cut-off distal end of the first spring 12 is flush with the distal end of the core wire, and then the flush portions may be fixed together by welding or the like.

S2, the proximal end of the core wire 11 equipped with the first spring 12 is inserted through the fixed clip 2321 on the fixed seat 232 of the fixed unit 23 until the distal end of the core wire 11 abuts on the supporting block 2331 of the supporting seat 233 of the fixed unit 23; the core wire 11 is clamped by the fixing clamp 2321 and fixed on the fixing seat 232.

S3, moving the fixing unit 23 or/and the welding unit to align the welding gun 24 with the proximal end of the first spring 12 to be welded. The starting position of the first coil of the first spring 12 (i.e., the proximal end of the first spring 12) may also be observed by a high magnification electron microscope on the welding unit, and the positions of the first and

second mounts

22 and 25 adjusted by the control system as necessary to align the welding head of the welding gun 24 with the starting position of the first coil of the first spring 12.

S4, the control unit drives the fixing chuck 2321 of the fixing unit 23 to drive the cored wire 11 to rotate along the central axis of the cored wire 11, and controls the fixing unit 23 to move along the preset X axis, and controls the welding gun 24 to weld the first spring 12 and the cored wire 11, so that the trajectory of the welded seam formed after welding overlaps at least a part of the spiral trajectory of the first spring 12.

In another embodiment, the control fixing unit 23 may be moved according to a preset trajectory instead of controlling the welding gun 24 to move according to a preset trajectory, in order to make the welding gun 24 adaptively align the position to be welded in the horizontal direction when the core wire 11 rotates along its central axis. Specifically, the welding head of the welding gun 24 is aligned with the proximal end of the first spring 12, and then the welding gun 24 is driven by the second fixing seat 25 to perform translational motion along the X axis while the core wire 11 rotates along the central axis thereof, and the welding condition is monitored in real time by a high-magnification electron microscope on the welding unit while welding. After the welding is completed, the track of the welding seam 13 is overlapped with at least a part of the spiral track of the first spiral coil of the first spring 13, and the welding starting point and the welding ending point are smoothly transited with the outer peripheral surface of the core wire 11 without obvious bulges.

S5, after the welding is completed, the fixed chuck 2321 is loosened, the welded guide wire 10 is drawn out from the fixed seat 232 and the support seat 233, and the welding condition of the first coil at the proximal end of the first spring 12 is examined under an optical microscope, so as to ensure that the weld 13 should be bright, complete and uniform, without obvious sharp and uneven points, smooth transition, and without scraping hand feeling.

In some embodiments of the present invention, the assembling process of the first spring 12, the second spring 14 and the core wire 11 is further included before the welding of the core wire 11 and the first spring 12. Wherein the assembly process includes:

sleeving the second spring 14 outside the core wire 11 from the distal end of the core wire 11, and enabling the distal end of the second spring 14 to be flush with the distal end of the core wire 11; the first spring 12 is sleeved outside the core wire 11 and the second spring 14 from the distal end of the core wire 11, and the distal end of the first spring 12 is flush with the distal end of the core wire 11.

Wherein the second spring 14 is wrapped between the first spring 12 and the core wire 11. The second spring 14 is fixed on the core wire 11 and abuts against the inclined surface of the second mounting section 1122, the first spring 12 is fixed on the core wire 11 and abuts against the inclined surface of the first mounting section 1121, and the portions of the distal ends of the first spring 12 and the second spring 14, which exceed the distal end of the core wire 11, are trimmed by a pair of scissors until the portions are flush with the distal end of the core wire 11 and then welded together.

By welding the core wire 11 and the first spring 12 by using the welding device and the welding method of the invention, the core wire 11 and the first spring 12 are connected by the welding seam 13 generated in a welding mode, and the track of the welding seam 13 is ensured to be overlapped with at least a part of the spiral line track of the first spring 12, compared with the existing annular welding along the circumferential direction of the guide wire, the welding length between the core wire 11 and the first spring 12 can be increased, the welding seam 13 is obviously lengthened, and the welding strength of the core wire 11 and the first spring 12 can be effectively improved. In addition, welding is carried out along the spiral line of the first spring 12, so that the smoothness of the welding seam 13 between the core wire 11 and the first spring 12 is effectively improved, the existence of bulges in the welding seam 13 is reduced or avoided, the reliability of the guide wire 10 in the use process is improved, and the use risk of the guide wire 10 in an interventional operation is reduced.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A guidewire, comprising:

core yarn;

2. The guidewire of claim 1, wherein the first spring has a first helical turn at a turn closest to a proximal end thereof, the first helical turn being connected to the core wire by a helical weld formed by welding.

3. The guidewire of claim 1, wherein the weld is helical and follows the helical path of the first spring at least one revolution around the outer circumference of the core wire from the proximal end of the first spring.

4. The guidewire of claim 1, wherein a ratio of the width of the weld to the width of the first spring is 1:1 to 1.5: 1.

5. The guidewire of any one of claims 1-4, further comprising a second spring positioned about the exterior of the corewire from the distal end toward the proximal end of the corewire, the second spring being positioned between the first spring and the corewire.

6. The guidewire of claim 5, wherein the corewire comprises a body portion and a tapered connecting portion, the connecting portion being disposed at a distal end of the body portion, the connecting portion comprising a first mounting segment and a second mounting segment, a distal end of the first mounting segment being connected to a proximal end of the second mounting segment, a maximum outer diameter of the second mounting segment being less than or equal to a minimum outer diameter of the first mounting segment, a proximal end of the first spring abutting the first mounting segment, and a proximal end of the second spring abutting the second mounting segment.

7. The guidewire of claim 5, wherein the outer peripheral surfaces of the first spring and the body portion are each provided with a PTFE coating.

8. A welding device for welding manufacture of a guide wire according to any one of claims 1 to 7, comprising:

a machine base;

9. A welding method for welding using the welding apparatus according to claim 8, characterized by comprising the steps of:

10. The welding method according to claim 9, wherein the step of fixing the core wire externally sheathed with the first spring to the fixing unit comprises in particular the steps of:

the near end of the core wire sleeved with the first spring penetrates through a fixed chuck on a fixed seat of the fixed unit until the near end tail end of the core wire abuts against a supporting seat of the fixed unit;

and the core wire is fixed on the fixed seat through the fixed chuck.