CN215841127U - Guide wire - Google Patents

Abstract

The utility model provides a guide wire, which belongs to the technical field of medical instruments and comprises a first mandrel, a first sheath and a second mandrel; the first mandrel comprises a first connecting part and a second connecting part which are sequentially connected along the axial direction, and the first connecting part is positioned at the far end of the second connecting part; the first sheath comprises a first sleeve and a tip connected to the far end of the first sleeve, the first sleeve is sleeved outside the first connecting part and connected to the near end of the first connecting part, and the tip is connected to the far end of the first connecting part; the second mandrel is positioned in the first sleeve, extends in the same direction as the first connecting part and is connected to the far end of the first connecting part, and the far end of the second mandrel is connected to the tip. The device aims to solve the technical problem that the shaping holding capacity of the end part of the wire guide head is poor in the prior art.

Description

Guide wire

Technical Field

The utility model belongs to the technical field of medical instruments, and particularly relates to a guide wire.

Background

Coronary artery disease is a common clinical problem in the field of coronary heart disease interventional therapy, and interventional diagnosis and treatment by guide wire conveying and matching with instruments are one of the rapidly developed treatment modes at present. In the treatment of stenosis occurring in a blood vessel such as a coronary artery surrounding the heart or the treatment of a site where the blood vessel is completely occluded due to the progress of endovascular calcification (for example, chronic total occlusion: cto), it is necessary to insert a guide wire for guiding a therapeutic device such as a balloon catheter into the blood vessel prior to the insertion of the guide wire into the blood vessel. The distal portion of the guidewire is required to have high flexibility, good shape retention, and torque transmission and kink resistance.

At present, in the guide wire used in clinic, a layer of spring ring sheath is sleeved outside a core wire, so that the far end of the guide wire has certain softness; however, the shaping holding capacity of the head end part of the guide wire is poor, and the guide wire is easy to bend in the process of being inserted into a blood vessel and easily damages the inner wall of the blood vessel, so that the guide wire cannot reach a target part in the blood vessel.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a guide wire, and aims to solve the technical problem that the shaping holding capacity of the end part of a guide wire head in the prior art is poor.

The utility model is realized in such a way that a guide wire comprises:

the first mandrel comprises a first connecting part and a second connecting part which are sequentially connected along the axial direction, and the first connecting part is positioned at the far end of the second connecting part;

the first sheath comprises a first sleeve and a tip connected to the far end of the first sleeve, the first sleeve is sleeved outside the first connecting part and connected to the near end of the first connecting part, and the tip is connected to the far end of the first connecting part; and

and the second mandrel is positioned in the first sleeve, extends in the same direction as the first connecting part and is connected to the far end of the first connecting part, and the far end of the second mandrel is connected to the tip.

Further, the guide wire further comprises a second sheath, the second sheath comprises a second sleeve, and the second sleeve is sleeved and fixedly connected to the first connecting portion and located inside the first sleeve.

Further, a predetermined distance is provided between the distal end of the second sheath and the distal end of the first sheath.

Furthermore, the first connecting part is provided with a first transition section, a first supporting section, a second transition section and a head end section which are connected in sequence along the direction from the near end to the far end; the first transition section is connected with the second connecting part; the outer diameter of the first transition section is gradually enlarged along the direction from the far end to the near end, the outer diameter of the second transition section is gradually enlarged along the direction from the far end to the near end, the first support section is axially arranged in an equal diameter mode, the diameter length of the first support section is equal to the diameter length of the far end of the first transition section and the diameter length of the near end of the second transition section, the head section is axially arranged in an equal diameter mode, the diameter length of the head section is equal to the diameter length of the far end of the second transition section, and the far end of the head section is connected to the head; the second sheath is at least sleeved on the second transition section, and the proximal end of the first sleeve is connected to the first transition section.

Furthermore, the second connecting portion is provided with a second supporting section and a third transition section which are sequentially connected in the direction from the far end to the near end, the outer diameter of the third transition section is gradually enlarged in the direction from the near end to the far end, the second supporting section extends in an equal diameter mode, the diameter length of the second supporting section is equal to that of the far end of the third transition section, and the second supporting section is connected to the first connecting portion.

Further, the second supporting section and the third transition section are coated with lubricating coatings.

Further, the cross-sectional shape of the head end section is circular or flat.

Further, the first sleeve is in a spiral spring shape; the second sheath comprises a second sleeve in a spiral spring shape, the near end of the second sleeve is fixedly connected with the first supporting section in a sealing mode, and the far end of the second sleeve is fixedly connected with the head end section in a sealing mode.

Further, the second mandrel comprises a plurality of helically wound wires.

Further, the guide wire further comprises a connecting structure for connecting with an external component, the connecting structure being connected with the proximal end of the second connecting portion.

Compared with the prior art, the utility model has the beneficial effects that: the guide wire adopts a structural design of double mandrels, the first mandrel is positioned in the first sheath to play a main supporting and guiding role, the first sheath is sleeved outside the first connecting part, the head end of the guide wire can be protected by the first sheath from damaging the inner wall of a blood vessel, and the first sheath can improve the tactile feedback of an operator; the second mandrel is connected and fixed with the far end of the first mandrel side by side, so that the rigidity of the far end of the first mandrel is enhanced, the first mandrel and the second mandrel are not easy to bend, the shape keeping capacity and the head end safety of the guide wire head end are improved, the guide wire is not easy to enter a branch blood vessel in the operation process, and the target part can be smoothly reached.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a guidewire provided by an embodiment of the present invention;

FIG. 2 is a schematic structural view of the first mandrel of FIG. 1;

FIG. 3 is a view Y-Y of FIG. 2;

FIG. 4 is a Y-Y view of the alternate embodiment of FIG. 2;

FIG. 5 is a schematic structural view of the second mandrel of FIG. 1;

FIG. 6 is a perspective view of the second mandrel of FIG. 1;

FIG. 7 is a view Z-Z of FIG. 6;

fig. 8 is an X-X view of fig. 1.

Description of reference numerals: 1. a first mandrel; 101. a first connection portion; 1011. a first transition section; 1012. a first support section; 1013. a second transition section; 1014. a head end section; 102. a second connecting portion; 1021. a second support section; 1022. a third transition section; 103. a connecting structure; 2. a lubricating coating; 3. a hydrophilic coating; 301. a proximal hydrophilic coating; 302. a distal hydrophilic coating; 4. a first sheath; 5. a second sheath; 6. a first sheath distal end; 7. a second mandrel; 701. a first strand; 702. a second strand; 703. a third stranded wire; 704. a fourth strand; 705. a fifth strand; 706. a sixth strand; 707. a seventh twisted wire; 8. a sixth welding spot; 9. a fourth solder joint; 10. a fifth welding spot; 11. a third solder joint; 12. a first solder joint; 13. and (4) a terminal.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "upward", "vertical", "horizontal", "bottom", "inner", "outer", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.

Referring to fig. 1, a guide wire according to an embodiment of the present invention includes a first mandrel 1, a first sheath 4, and a second mandrel 7; the first mandrel 1 comprises a first connecting part 101 and a second connecting part 102 which are sequentially connected along the axial direction, wherein the first connecting part 101 is positioned at the far end of the second connecting part 102; the first sheath 4 comprises a first sleeve and an end head 13 connected to the far end of the first sleeve, the first sleeve is sleeved outside the first connecting portion 101 and connected to the near end of the first connecting portion 101, the end head 13 is connected to the far end of the first connecting portion 101, specifically, the first sheath 4 is sleeved outside the first connecting portion 101, and two ends of the first sheath 4 are fixedly connected with the first connecting portion 101 respectively; the second mandrel 7 is located in the first sleeve of the first sheath 4, the second mandrel 7 and the first connecting portion 101 extend in the same direction and are connected to the far end of the first connecting portion 101, the far end of the second mandrel 7 is connected to the end head 13, the second mandrel 7 and the first connecting portion 101 are fixedly connected in parallel, and the far end 6 of the first sheath is straight.

It should be noted that, the front end may also be called as the far end, and for convenience of description, the following are defined: when the guidewire is inserted into a blood vessel, the end distal to the operator is defined as the distal or leading end and the end proximal to the operator is defined as the proximal or trailing end.

Specifically, the first mandrel 1 should be made of a material that has excellent torque transmission, tracking, support, superelasticity, durability, and fatigue properties, and provides good support and push forces for the guidewire. The surface of the first mandrel 1 should be smooth and clean without defects such as scabs, cracks, burrs and scratches that could potentially risk the patient. The first mandrel 1 is made of any one or more of Ni-Ti alloy, stainless steel, cobalt-based alloy, Fe-Mn alloy, Cu-Zn alloy, and Fe-Ni alloy, but other materials with suitable properties may be used to prepare the first mandrel 1. The first mandrel 1 is preferably made of a stainless steel wire having high strength and high elasticity. The second mandrel 7 is located inside the first sheath 4, the second mandrel 7 is located at the far end of the first connecting portion 101 and is fixedly connected with the first connecting portion 101 in parallel, the far end of the second mandrel 7 is fixedly connected with the far ends of the first sheath 4 and the first connecting portion 101 in a sealing mode, and the sealing fixed connection can be fixedly connected through any one of connection modes such as brazing, laser welding, resistance welding, ultrasonic welding, crimping and bonding.

In addition, as shown in fig. 5, 6 and 7, the second mandrel 7 includes a plurality of strands of metal wires spirally wound, the second mandrel 7 is prepared by a wire twisting machine using a twisted wire, and the twisted wire constituting the second mandrel 7 should have excellent properties of torque transmission, tracking, support, super-elasticity, durability, fatigue, and the like, and provide a good shaping ability and a shaping holding ability to the tip end of the guide wire so that the tip end of the guide wire is not wound in the blood vessel. The surface of the skein forming the second mandrel 7 should be smooth and clean, and has no defects of scabs, cracks, burrs, scratches and the like which have potential risks to patients, the skein forming the second mandrel 7 is made of any one or more of alloy wires such as Ni-Ti alloy wire, stainless steel wire, cobalt-based alloy wire, Fe-Mn alloy wire, Cu-Zn alloy wire, Fe-Ni alloy wire, platinum-nickel alloy wire, platinum-tungsten alloy wire, gold wire, medical noble metal wire and the like, and of course, other materials with proper performance can be used for preparing the second mandrel 7; preferably, the second mandrel 7 is made of a stainless steel wire having high elasticity; the second core shaft 7 and the first core shaft 1 may be connected and fixed by any one of connection methods such as brazing, laser welding, resistance welding, ultrasonic welding, crimping, or bonding. As shown in fig. 1, preferably, the sixth welding point 8, the fourth welding point 9, the fifth welding point 10, the first welding point 12, and the end head 13 are connected and fixed by soldering or laser welding, and the end head 13 is the second welding point; preferably, the third welding points 11 are connected and fixed by soldering or crimping.

The beneficial effect of this embodiment lies in: compared with the prior art, the guide wire adopts the structural design of double mandrels, the first mandrel 1 is positioned in the first sheath 4 and plays a main role in supporting and guiding, the first sheath 4 is sleeved outside the first connecting part 101, the first sheath 4 can prevent the end of the guide wire head from damaging the inner wall of a blood vessel, and the first sheath 4 can improve the tactile feedback of an operator; the second mandrel 7 is connected and fixed with the far end of the first mandrel 1 side by side, so that the rigidity of the far end of the first mandrel 1 is enhanced, the first mandrel 1 and the second mandrel 7 are not easy to bend, the molding holding capacity of the guide wire head end and the safety of the head end are improved, the guide wire is not easy to enter a branch blood vessel in the operation process, and the target part can be smoothly reached.

Further, as a preferred embodiment of this embodiment, as shown in fig. 1, the guide wire further includes a second sheath 5, and the second sheath 5 includes a second sleeve, and the second sleeve is sleeved and fixedly connected to the first connecting portion 101 and is located inside the first sleeve.

In the embodiment, a double-sleeve structure is adopted, the second sheath 5 is arranged inside the first sheath 4, and plays a certain supporting role for the first mandrel 1 and the first sheath 4, so that the torque transmission and the folding resistance of the guide wire can be improved, and the head end of the guide wire is not easy to wind in a blood vessel; in addition, the first mandrel 1, the first sheath 4 and the second sheath 5 together form a composite developing section of the guide wire head end, so that the guide wire head end has a stronger developing effect under X-rays.

Further, as a preferred embodiment of the present embodiment, as shown in fig. 1, a predetermined distance is provided between the distal end of the second sheath 5 and the distal end of the first sheath 4, and the second mandrel 7 is at least partially located within the second sheath 5.

In the present embodiment, the second sheath 5 is located inside the first sheath 4, but has a certain predetermined distance from the front end of the first sheath 4, the second mandrel 7 is fixedly connected to the front end of the first mandrel 1 side by side, the second mandrel 7 is disposed within the predetermined distance, and two ends of the second mandrel 7 are welded and fixed to the ends of the first sheath 4 and the second sheath 5, respectively. The structural design can play a better supporting role for the guide wire, can improve the torque transmission and the folding resistance of the guide wire, and can prevent the head end of the guide wire from being wound in a blood vessel; in addition, the first mandrel 1, the first sheath 4, the second mandrel 7 and the second sheath 5 jointly form a composite developing section of the guide wire head end, so that the guide wire head end has a stronger developing effect under X-rays.

Further, as a preferred embodiment of the present embodiment, as shown in fig. 2, the first connecting portion 101 has a first transition section 1011, a first supporting section 1012, a second transition section 1013 and a head end section 1014 connected in sequence in the proximal-to-distal direction; the first transition section 1011 is connected with the second connecting part 102; the outer diameter of the first transition section 1011 is gradually enlarged from the far end to the near end, the outer diameter of the second transition section 1013 is gradually enlarged from the far end to the near end, the first support section 1012 is axially arranged in an equal diameter, and the diameter length of the first support section 1012 is equal to the diameter length of the far end of the first transition section 1011 and the diameter length of the near end of the second transition section 1013, the head end section 1014 is axially arranged in an equal diameter, and the diameter length of the head end section is equal to the diameter length of the far end of the second transition section 1013; the distal end of tip segment 1014 is connected to tip 13; the second sheath 5 is sleeved at least on the second transition section 1013, and the proximal end of the first sleeve is connected to the first transition section 1011; the second mandrel 7 is fixedly connected side-by-side with the core wire of the head end section 1014.

In this embodiment, the head end section 1014 is a distal end, the first transition section 1011 is a proximal end, and the diameter of the first mandrel 1 gradually decreases from the proximal end to the distal end, so that the distal end of the first mandrel 1 has good flexibility and support performance, and can more easily pass through tortuous blood vessels, the profile shapes of the first transition section 1011 and the second transition section 1013 may be any one of a cone shape, a parabola shape, and a streamline shape, as shown in fig. 3 and 4, the cross-sectional shape of the head end section 1014 is a round shape or a flat shape by press working, which is beneficial to optimizing the mechanical properties of the head end of the first mandrel 1, and can further obtain a suitable guide wire head end flexibility.

In addition, the surface of the metal wire processed into the first mandrel 1 is pre-coated with a PTFE (polytetrafluoroethylene) coating, that is, the outer surfaces of the first transition section 1011, the first support section 1012, the second transition section 1013 and the head end section 1014 are pre-coated with PTFE coatings, which is beneficial to improving the lubricity of the guide wire; the first mandrel 1 can be manufactured by using methods or technologies such as physical grinding, electropolishing, or chemical etching to manufacture the linear first mandrel 1, preferably by using the physical grinding method, and then pressing the distal end of the first mandrel 1 to manufacture a complete metal core.

Further, as a preferred embodiment of this embodiment, as shown in fig. 2, the second connecting portion 102 has a second supporting section 1021 and a third transition section 1022 connected in sequence along a direction from the distal end to the proximal end, the third transition section 1022 is disposed gradually expanding along the direction from the proximal end to the distal end, the second supporting section 1021 extends in an equal diameter, and has a diameter length equal to that of the distal end of the third transition section 1022, and the second supporting section 1021 is connected to the first connecting portion 101.

Specifically, the cross-sectional shape of the second support section 1021 is circular, and the diameter of the second support section 1021 is equal to the diameter of the diverging ends of the third transition section 1022 and the first transition section 1011. The second supporting section 1021 and the third transition section 1022 have a better supporting effect and a pushing effect on the first connecting portion at the far end, and stability of the guide wire in the using process is guaranteed.

In addition, the lubricating coatings 2 are coated outside the second supporting section 1021 and the third transition section 1022, and the specific lubricating coatings 2 are PTFE (polytetrafluoroethylene) coatings, which is beneficial to improving the trafficability of the guide wire.

Further, as a preferred embodiment of this embodiment, as shown in fig. 2, the guide wire further includes a connection structure 103 for connecting with an external component, the connection structure 103 is connected to a proximal end of the second connection portion 102, and specifically, the connection structure 103 is fixedly connected to an end (proximal end) of the third transition section 1022 far away from the second support section 1021.

Specifically, connection structure 103 is the cylinder, and the one end of cylinder is fixed in the tip of third changeover portion 1022, and the surface of cylinder is equipped with structures such as screw thread for be connected with external component, and firm in connection is reliable, and the suitability is stronger.

Further, as a preferred embodiment of the present embodiment, as shown in fig. 1, the first sleeve is in the shape of a coil spring; the second sheath 5 comprises a second sleeve in the form of a helical spring, the proximal end of which is sealingly and fixedly connected to the first support section 1012 and the distal end of which is sealingly and fixedly connected to the head section 1014. Specifically, one end of the first sleeve is fixedly connected to the end of the first transition section 1011 close to the second support section 1021 in a sealing manner, and the other end of the first sleeve is fixedly connected to the end of the head end section 1014 far from the second transition section 1013 in a sealing manner.

Specifically, the distal end of the second mandrel 7 is fixedly connected with the distal ends of the first sleeve and the head end portion in a sealing manner, and the fixed connection in the sealing manner can be performed by any one of connection manners such as brazing, laser welding, resistance welding, ultrasonic welding, crimping, bonding and the like; the first sleeve is formed by winding a single-strand wire or a plurality of strands of wires through a spring machine or weaving through a weaving machine, and preferably adopts a single-strand wire spring ring; the second sleeve is formed by winding single strand or multiple strands of wires by a spring machine or knitting by a knitting machine, and the second sleeve is preferably a 6-strand spring ring; the multi-strand wire can be made of the same material or a plurality of different materials, and the cross section of the wire is circular, or rectangular, or irregularly shaped. The metal wire for manufacturing the first sleeve and the second sleeve can be stainless steel wire, stainless steel wire with a PTFE coating, platinum nickel wire, platinum tungsten wire, gold wire or medical precious metal alloy wire, and the like, wherein any one or more materials are formed by winding through a spring machine or weaving through a weaving machine. Preferably, the second sleeve is made of stainless steel wires; preferably, the distal end of the first sleeve is made of a platinum tungsten wire or a platinum nickel wire, the proximal end of the first sleeve is made of a stainless steel wire, and the first sleeve developing spring and the stainless steel spring can be fixedly connected through any one of the connection modes of brazing, laser welding, resistance welding, ultrasonic welding, crimping, bonding and the like.

In the embodiment, the proximal part of the first sleeve is processed by spraying, and the surface roughness of the proximal part is far higher than that of the distal part, so that the hydrophilic coating on the surface of the first sleeve can obtain different thicknesses, and the tactile feedback capability of the guide wire can be improved; the hydrophilic coating 3 is coated on the outer portion of the first sleeve, the hydrophilic coating 3 comprises a near-end hydrophilic coating 301 and a far-end hydrophilic coating 302, the thickness of the near-end hydrophilic coating 301 is larger than that of the far-end hydrophilic coating 302, namely the thickness of one end, close to the second connecting portion 102, of the first sleeve is larger than that of one end, far away from the second connecting portion 102, of the first sleeve, and the thickness difference is 1-20 microns; the hydrophilic coating 3 can improve the lubricity of the surface of the guide wire, and the mechanism is that the hydrophilic coating 3 absorbs water molecules to form a gel-like film on the surface of the first sleeve, and the film can reduce the passing resistance of the first sleeve in a blood vessel and in related matched instruments, so that the first sleeve has good lubricity and tracking performance, the guide wire is easy to push, the passing capacity of the guide wire is effectively improved, the guide wire can easily reach a target part in the blood vessel, and meanwhile, the formation of thrombus in the blood vessel can be effectively avoided.

Alternatively, the exterior of the first sleeve can be coated with a PTFE coating, a hydrophilic coating 3 or a silicone oil coating, wherein the coating can be one of the coatings or a combination of the coatings.

In summary, in the present embodiment, the second mandrel 7 is connected and fixed with the distal end of the first mandrel 1 side by side, so as to improve the shape retaining capability and the safety of the guide wire head end; the second sleeve is sleeved and fixed on the peripheries of the first mandrel 1 and the second mandrel 7, and the distal ends of the first mandrel 1 and the second mandrel 7 are exposed out of the distal end of the second sleeve for a certain distance; the first sleeve is sleeved and fixed outside the guide wire, and the second mandrel 7, the first sleeve and the second sleeve form a composite cone structure inside the guide wire head end together, so that the connection strength, the support property and the folding resistance of the guide wire head end and the torque transmission performance of the guide wire head end can be improved; the second mandrel 7, the first sleeve and the second sleeve jointly form a guide wire head end composite developing section, so that the head end of the guide wire has a strong developing effect under X-rays.

In practical application, the specific size of the guide wire needs to be designed according to practical requirements, and the following size specifications are preferably adopted in the embodiment: the diameter D of the first mandrel is 0.010-0.038 ", and the total length of the first mandrel is 50-450 cm; the diameter of the second mandrel 7 is 0.001 "-0.04", and the diameter of the strand (also called strand) for making the second mandrel 7 is 0.0003 "-0.013"; in the second sleeve, the wire diameter of a spring ring for preparing the second sleeve is 0.001-0.004 ', the outer diameter of the spring ring is 0.006-0.038', and the length of the spring is 1-100 mm; in the first sleeve, the wire diameter of the spring ring is 0.0015-0.01 ', the outer diameter of the spring ring is 0.01-0.038', and the length of the spring is 1-450 cm; the thickness of the coating on the outer portions of the second supporting section 1021 and the third transition section 1022 is about 0.004-0.02 mm, and the thickness of the hydrophilic coating 3 coated on the outer portion of the first sleeve is about 0.004-0.01 mm. Referring to fig. 6 and 7, the first stranded wire 701, the second stranded wire 702 and the third stranded wire 703 are made of stainless steel wires, the fourth stranded wire 704, the fifth stranded wire 705, the sixth stranded wire 706 and the seventh stranded wire 707 are made of platinum tungsten wires or platinum nickel wires, and the second mandrel 7 formed by twisting through a wire twisting machine can enhance the developing performance of the guide wire tip.

The foregoing is considered as illustrative only of the preferred embodiments of the utility model, and is presented merely for purposes of illustration and description of the principles of the utility model and is not intended to limit the scope of the utility model in any way. Any modifications, equivalents and improvements made within the spirit and principles of the utility model and other embodiments of the utility model without the creative effort of those skilled in the art are included in the protection scope of the utility model based on the explanation here.

Claims (10)

1. A guidewire, comprising:

the first mandrel comprises a first connecting part and a second connecting part which are sequentially connected along the axial direction, and the first connecting part is positioned at the far end of the second connecting part;

the first sheath comprises a first sleeve and a tip connected to the far end of the first sleeve, the first sleeve is sleeved outside the first connecting part and connected to the near end of the first connecting part, and the tip is connected to the far end of the first connecting part; and

the second mandrel is positioned in the first sleeve, extends in the same direction as the first connecting part and is connected to the far end of the first connecting part, and the far end of the second mandrel is connected to the tip.

2. The guidewire of claim 1, further comprising a second sheath comprising a second sleeve that is sleeved and fixedly attached to the first connector and is positioned within the first sleeve.

3. The guidewire of claim 2, wherein the distal end of the second sheath is a predetermined distance from the distal end of the first sheath.

4. The guide wire of claim 2, wherein the first connection portion has a first transition section, a first support section, a second transition section and a head end section which are connected in sequence in a proximal end to distal end direction; the first transition section is connected with the second connecting part; the outer diameter of the first transition section is gradually enlarged along the direction from the far end to the near end, the outer diameter of the second transition section is gradually enlarged along the direction from the far end to the near end, the first support section is axially arranged in an equal diameter mode, the diameter length of the first support section is equal to the diameter length of the far end of the first transition section and the diameter length of the near end of the second transition section, the head section is axially arranged in an equal diameter mode, the diameter length of the head section is equal to the diameter length of the far end of the second transition section, and the far end of the head section is connected to the head; the second sheath is at least sleeved on the second transition section, and the proximal end of the first sleeve is connected to the first transition section.

5. The guide wire of any one of claims 1-4, wherein the second connecting portion has a second support section and a third transition section connected in series in a distal-to-proximal direction, the third transition section having an outer diameter that gradually increases in a proximal-to-distal direction, the second support section extending in a constant diameter and having a diameter length equal to a diameter length of a distal end of the third transition section, the second support section being connected to the first connecting portion.

6. The guide wire of claim 5, wherein said second support section and said third transition section are externally coated with a lubricious coating.

7. The guidewire of claim 4, wherein the tip section has a cross-sectional shape that is rounded or flattened.

8. The guidewire of claim 4, wherein the first sleeve is in the form of a coil spring; the second sheath comprises a second sleeve in a spiral spring shape, the near end of the second sleeve is fixedly connected with the first supporting section in a sealing mode, and the far end of the second sleeve is fixedly connected with the head end section in a sealing mode.

9. The guidewire of claim 1, wherein the second mandrel comprises a plurality of helically wound wires.

10. The guidewire of claim 1, further comprising a connection structure for connecting to an external component, the connection structure being connected to a proximal end of the second connector portion.

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