Bending-adjustable guide wire and preparation method thereof

Abstract

The invention discloses an adjustable bending guide wire which comprises a head section, a transition section and a supporting section, a core wire is arranged on the adjustable bending guide wire, the core wire penetrates through the head section, the transition section and the supporting section, a first bending part is arranged on the periphery of the core wire of the head section, and the first bending part comprises a plurality of first bending units and developing springs arranged between the adjacent first bending units. One developing spring is arranged between every two adjacent first bending units, the first bending rope and the pulling device on each first bending unit can drive the first bending units and the developing springs to bend, and the developing springs can provide activity space for the first bending units while ensuring that the core wire is bent; the bending angle can be accurately controlled while the guide wire has sufficient bending capacity, and the defect that in the prior art, the adjustability and bendability of an adjustable bending guide wire are unbalanced is overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to medical devices for inputting media into or onto a human body, and in particular to an adjustable curved guide wire. Background Art

[0002] Blood vessels are an important way for many minimally invasive surgeries to enter the human body. Through the intravascular treatment pathway, doctors can access almost any organ. With the continuous development of interventional medicine, the manufacturing process of instruments and consumables used in surgery has been continuously improved, and guidewires, as one of the important instruments, have come into being.

[0003] The human vascular system is complex and changeable, and the blood vessels are curved and small, which increases the difficulty of surgical operations. Traditional straight guide wires are difficult to adapt to this complex anatomical structure, so the emergence of adjustable curved guide wires has become an urgent need.

[0004] However, the existing adjustable bend guidewires usually have a contradiction between adjustability and bendability, that is, when the guidewire is soft enough, it is difficult to control, and when the guidewire is easy to control, the turning angle is limited.

[0005] Therefore, it is necessary to improve the guidewire used in daily life to solve the above-mentioned defects. Summary of the invention

[0006] The present invention overcomes the deficiencies of the prior art and provides an adjustable curved guide wire, aiming to solve the defect of unbalanced adjustability and curvature of the adjustable curved guide wire in the prior art.

[0007] To achieve the above object, the technical solution adopted by the present invention is: an adjustable curved guide wire, comprising: a head section, a transition section and a support section, the adjustable curved guide wire is provided with a core wire, and the core wire runs through the head section, the transition section and the support section: In the head section: the core wire is conical in shape, with the tip of the cone facing away from the support section, a guide wire cylinder is fixedly arranged at the tip of the core wire, a first bending portion is arranged at the periphery of the core wire, the first bending portion includes a plurality of first bending units, and a developing spring arranged between adjacent first bending units, one developing spring is arranged between each adjacent first bending unit, each first bending unit is respectively hinged to the core wire, the hinge direction is consistent and vertically arranged, the hinge axis passes through the centroid of the first bending unit, and a head coating is arranged on the surface of each first bending unit; In the transition section: a plurality of second bending units are arranged on the periphery of the core wire, adjacent second bending units are respectively hinged, the hinge directions of the plurality of second bending units are consistent and consistent with the hinge direction of the first bending unit, the hinge axis passes through the centroid of the second bending unit, and a transition section coating is arranged on the surface of each second bending unit; In the support segment: a sheath is disposed on the periphery of the core wire, and a support segment coating is disposed on the periphery of the sheath; The first bending holes are arranged on both sides of the inner wall of each of the first bending units, the first bending holes on each of the first bending units are located on the same horizontal plane, a first bending rope passes through each of the first bending holes, one end of the first bending rope is fixedly connected to the guide wire column, and the other end is connected to a pulling device, and the pulling device is used to pull the first bending rope.

[0008] In a preferred embodiment of the present invention, the core wire in the transition section is truncated cone-shaped, and the cross-sectional area of ​​one end of the core wire in the transition section connected to the core wire in the head section is smaller than the cross-sectional area of ​​the core wire in the support section.

[0009] In a preferred embodiment of the present invention, a transition block is arranged between the head section and the transition section, and the transition block is fixedly connected to the core wire. A plurality of transition section bending holes are arranged on both sides of the inner wall of each second bending unit, and the transition section bending hole includes an inner hole and an outer hole. The inner hole and the outer hole are arranged on the same horizontal plane, and in the transition section bending hole on each side, the inner hole is located between the outer hole and the inner wall of the second bending unit.

[0010] In a preferred embodiment of the present invention, a second bending rope passes through each of the outer holes, one end of the second bending rope is fixedly connected to the transition block, and the other end is connected to the pulling device, and a first bending rope passes through each of the inner holes, and the pulling device can pull the first bending rope and the second bending rope respectively.

[0011] In a preferred embodiment of the present invention, the diameter of the first bending rope is greater than the diameter of the second bending rope, and the raw materials of the first bending rope and the second bending rope are one of Kevlar fiber and Teflon-coated stainless steel wire.

[0012] In a preferred embodiment of the present invention, the core wire is made of one of nickel-titanium alloy, stainless steel and nickel-titanium / stainless steel composite alloy, and the developing spring is made of platinum-nickel alloy.

[0013] In a preferred embodiment of the present invention, the length dimensions and radial directions of several of the developing springs are respectively consistent, the cross-sectional outer contours of the first bending unit and the second bending unit are circular, the outer diameter dimensions of several of the first bending units are consistent, the outer diameter dimension of the developing spring is consistent with the outer diameter dimension of the first bending unit, and the first bending unit is smaller than the second bending unit closest to the head segment.

[0014] In a preferred embodiment of the present invention, the structure of the developing spring is single-strand or multi-strand, and the total length of several developing springs in the head section accounts for 60-80% of the length of the head section.

[0015] In a preferred embodiment of the present invention, in the transition section, the outer diameter and length of a plurality of the second bending units gradually decrease along the direction from the support section to the head section.

[0016] In a preferred embodiment of the present invention, the sheath material is a polymer including polyethylene and tungsten, the head coating and the transition section coating are hydrophobic coatings, and the material used is one of polytetrafluoroethylene and silicone resin; the support section coating is a hydrophilic coating, and the material used is one of polyurethane, polyvinyl alcohol and polyvinyl pyrrolidone.

[0017] The present invention solves the defects existing in the background technology and has the following beneficial effects: (1) The present invention provides an adjustable bend guide wire, comprising a head section, a transition section and a support section. The adjustable bend guide wire is provided with a core wire, which runs through the head section, the transition section and the support section. A first bending portion is provided on the periphery of the core wire of the head section. The first bending portion comprises a plurality of first bending units and a developing spring provided between adjacent first bending units. A developing spring is provided between each adjacent first bending unit. The first bending rope and the pulling device on each first bending unit can drive the plurality of first bending units and the developing spring to bend. Compared with the guide wire in the prior art, the developing spring can provide a movable space for the first bending unit while ensuring the bending of the core wire, so that the guide wire can have sufficient bending ability and the bending angle can be precisely controlled, thereby solving the defect of unbalanced adjustability and bending of the adjustable bend guide wire in the prior art.

[0018] (2) In the present invention, the length dimensions and radial directions of the plurality of developing springs are respectively consistent, and the outer diameter dimension of the developing spring is consistent with the outer diameter dimension of the first bending unit. The consistency and regularity of the developing springs enable the use of the developing segment as a measurement reference in the blood vessel. Compared with the prior art, this can help to judge the length of the blood vessel, help to reduce the damage to the blood vessel wall when the guide wire is advanced in the blood vessel, and protect the blood vessel from damage. The dispersed developing springs provide more control points, making the guide wire more controllable in the blood vessel, and can reduce metal artifacts and improve image quality.

[0019] (3) In the present invention, a transition block is provided between the head section and the transition section, and the transition block is fixedly connected to the core wire. A plurality of transition section bending holes are provided on both sides of the inner wall of each second bending unit, and the transition section bending holes include an inner hole and an outer hole. A second bending rope passes through each outer hole, and the second bending rope is fixedly connected to the transition block. Both the first bending rope and the second bending rope exist in the transition section. Compared with the prior art, by providing the first bending rope and the second bending rope at the transition block, the bending and torsion of the guide wire can be better controlled, thereby improving the maneuverability and stability of the guide wire in the blood vessel.

[0020] (4) In the present invention, the head coating and the transition section coating are hydrophobic coatings, and the support section coating is a hydrophilic coating. Compared with the prior art, the hydrophilic coating can attract water molecules to form a lubricating surface on the guide wire, thereby reducing the friction between the guide wire and the blood vessel and improving the permeability. Water-based coatings such as polytetrafluoroethylene and silicone resin can provide good lubricity and reduce friction. The structural design of first hydrophobic coating and then hydrophilic coating improves the performance and safety of medical devices by combining the protectiveness of the hydrophobic coating and the lubricity of the hydrophilic coating, while reducing the friction and infection risks during surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 is a three-dimensional structural diagram of a preferred embodiment of the present invention; Figure 2 is a cross-sectional view of a transition section of a preferred embodiment of the present invention; Figure 3 is a side view of a head section of a preferred embodiment of the present invention; In the figure: 100, head section; 110, first bending unit; 120, developing spring; 200, transition section; 300, supporting section; 400, core wire. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0026] like Figure 1 and Figure 2 As shown, an adjustable curved guidewire comprises: a head section 100, a transition section 200 and a support section 300. The adjustable curved guidewire is provided with a core wire 400, which runs through the head section 100, the transition section 200 and the support section 300. The head section has a total length of 50-55 mm, the transition section has a total length of 55-65 mm, and the support section has a total length of 1000-1100 mm.

[0027] like Figure 3 As shown, in the head section 100: the core wire 400 is in a conical shape, the conical tip is facing away from the support section 300, a guide wire cylinder is fixedly arranged at the tip of the core wire 400, a first bending portion is arranged on the periphery of the core wire 400, the first bending portion includes a plurality of first bending units 110, and a developing spring 120 arranged between adjacent first bending units 110, a developing spring 120 is arranged between each adjacent first bending unit 110, each first bending unit 110 is respectively hinged to the core wire 400, the hinge direction is consistent and vertically arranged, the hinge axis passes through the centroid of the first bending unit 110, and each first bending unit 110 is provided with a head coating on the surface; the number of first bending units 110 is 6-10, the length of each first bending unit 110 is 3-5mm, and the length of each developing spring 120 is 2-3mm. The tip diameter of the core wire 400 in the head section 100 is 0.3 mm, and the diameter of the end of the core wire 400 connecting the transition section in the head section 100 is 0.5 mm.

[0028] The tapered core wire 400 design makes the guide wire head more flexible, which can better adapt to the bending and turning of the blood vessel, and improve the accuracy and safety of the operation. Through the hinged first bending unit 110 and the developing spring 120, the bending angle and shape of the guide wire can be accurately controlled, so that the guide wire can better adapt to the complex blood vessel path. The developing spring 120 provides a movable space for the first bending unit 110, while maintaining the stability of the core wire 400, so that the guide wire will not be excessively deformed or broken when bending.

[0029] In the transition section 200: a plurality of second bending units are arranged on the periphery of the core wire 400, adjacent second bending units are hinged respectively, the hinge directions between the plurality of second bending units are consistent and consistent with the hinge direction of the first bending unit 110, the hinge axis passes through the centroid of the second bending unit, and a transition section 200 coating is arranged on the surface of each second bending unit; the number of second bending units is 10-12.

[0030] The second bending unit is designed to enhance the flexibility of the guidewire, making it easier to pass through extremely twisted blood vessels and side branch blood vessels. The design of the transition section 200 increases the compliance and tracking of the guidewire, making it less likely to sag and easier to pass through twisted and angled blood vessels.

[0031] The first bending unit 110 and the second bending unit are made of one of platinum-tungsten alloy and nickel-titanium alloy, and turning spaces are provided between the first bending unit 110, the second bending unit and the core wire 400. Nickel-titanium alloy has shape memory properties and superelasticity, can withstand significant strain, and immediately return to its original shape after external stress is eliminated. The turning space is provided between the first bending unit 110, the second bending unit and the core wire 400, which can provide better force conduction and flexibility, so that the catheter can pass through the curved or narrow part of the blood vessel more smoothly, reducing damage to the blood vessel wall.

[0032] In the support segment 300: a sheath is disposed around the core wire 400, and a support segment 300 coating is disposed around the sheath; the design of the sheath can improve the support force of the guide wire, and the coating can make the surface of the guide wire smoother, reduce the friction force when the guide wire moves in the blood vessel, and improve the tracking performance of the guide wire. The thickness of the sheath is 0.1 mm, the sheath material is a mixture of polyethylene and tungsten, the sheath coating material is hydrophilic polyvinyl alcohol, and the coating thickness is 0.02 mm.

[0033] The fine adjustment of the head segment and the overall bending of the transition segment form a hierarchical control logic of "fine-tuning first and then compliance": the operator first adjusts the direction of the head by pulling the first bending rope, and then uses the hinged structure of the transition segment to follow the natural direction of the blood vessel, avoiding excessive manipulation that may cause the guide wire to "swing", and preventing the guide wire from being unable to pass through complex paths due to excessive rigidity.

[0034] The rapid recovery of the developing spring and the superelastic deformation of the core wire form a dynamic deformation coupling mechanism, which enables the guide wire to temporarily adapt to the path when passing through extremely curved blood vessels, and to quickly reset according to the rebound of the developing spring, avoiding the "setting after bending" problem of traditional guide wires due to the single material.

[0035] First bending holes are provided on both sides of the inner wall of each first bending unit 110. The first bending holes on each first bending unit 110 are located on the same horizontal plane. A first bending rope passes through each first bending hole. One end of the first bending rope is fixedly connected to the guide wire column, and the other end is connected to a pulling device, which is used to pull the first bending rope.

[0036] By connecting the first bending rope with the pulling device, the bending angle and shape of the guide wire can be accurately controlled to improve the accuracy of the operation. By controlling the pulling of the first bending rope, the damage to the blood vessel wall can be reduced, the risk of surgical complications can be reduced, and the safety of the operation can be improved.

[0037] The guidewire is too rigid and difficult to pass through tortuous blood vessels, which can easily damage the blood vessel wall. The guidewire is too flexible, the pushing force transmission efficiency is low, and it is easy to get tangled or out of control. The elastic deformation of the developing spring absorbs part of the pushing force, so that the distal flexibility adapts to the bending of the blood vessel. The alternating setting of the developing spring and the first bending unit can control the bending amplitude of the head section by pulling the first bending rope, and the first bending unit can be bent autonomously by the resilience of the developing spring, avoiding blood vessel perforation caused by the rigid structure forcing through. The developing spring absorbs the axial pressure generated when the guidewire is pushed by compression, reducing the risk of the distal rigidity colliding with the blood vessel while maintaining sufficient pushing efficiency.

[0038] An adjustable curved guide wire comprises a head section 100, a transition section 200 and a support section 300, wherein a core wire 400 is arranged on the adjustable curved guide wire, and the core wire 400 runs through the head section 100, the transition section 200 and the support section 300, and a first curved portion is arranged on the periphery of the core wire 400 of the head section 100, wherein the first curved portion comprises a plurality of first curved units 110, and a developing spring 120 arranged between adjacent first curved units 110, wherein each adjacent first curved unit 110 is provided with a developing spring 120, and each first curved spring 120 and the first curved spring 120 are provided with a plurality of first curved units 110, wherein each first curved unit 110 is provided with a developing spring 120, and each first curved unit 110 is provided with a developing spring 120, wherein ... The first bending rope and pulling device on the bending unit 110 can drive several first bending units 110 and developing springs 120 to bend. The developing springs 120 and the first bending units 110 can combine their advantages to control the bending of the core wire 400 through the first bending unit 110. The developing springs 120 can provide movement space for the first bending unit 110 while ensuring the bending of the core wire 400, so that the guide wire can have sufficient bending ability and the bending angle can be precisely controlled, thereby solving the defect of unbalanced adjustability and bending of the adjustable guide wire in the prior art.

[0039] The core wire 400 in the transition section 200 is truncated cone-shaped, and the cross-sectional area of ​​the end of the core wire 400 in the transition section 200 connected to the core wire 400 in the head section 100 is smaller than the cross-sectional area of ​​the core wire 400 in the support section 300. As the cross-sectional area of ​​the core wire 400 gradually increases, the distal end of the guide wire can be made softer, the flexibility and tracking of the guide wire are enhanced, and it is easier to pass through the tortuous blood vessel path, reduce the probability of catheter kinking, and improve the pushing performance and torsion performance of the catheter. The gradual change of the cross-sectional area of ​​the core wire 400 helps the operator to better control the guide wire and improve the accuracy and safety of the operation. Increasing the cross-sectional area of ​​the distal end of the guide wire can reduce the loss of torsion / torque transmission of the guide wire, while eliminating the "tail swinging" phenomenon, ensuring the softness and deformation resistance of the distal end of the guide wire. The diameter of the end of the core wire 400 connected to the head section in the transition section 200 is 0.5 mm, and the diameter of the end of the core wire 400 connected to the support section in the transition section 200 is 0.8 mm.

[0040] A transition block is provided between the head section 100 and the transition section 200, and the transition block is fixedly connected to the core wire 400. A plurality of transition section 200 bending holes are provided on both sides of the inner wall of each second bending unit. The transition section 200 bending hole includes an inner hole and an outer hole, and the inner hole and the outer hole are both provided on the same horizontal plane. In the transition section 200 bending hole on each side, the inner hole is located between the outer hole and the inner wall of the second bending unit. The inner hole diameter is 0.25 mm, and the outer hole diameter is 0.15 mm.

[0041] The design of the transition block can reduce the impact of the core wire 400 due to the change between the head section 100 and the transition section 200, and achieve a smooth transition. The fixed connection between the transition block and the core wire 400 helps to disperse the stress and reduce the stress concentration points that appear during the use of the guide wire, thereby reducing the risk of the guide wire breaking.

[0042] A second bending rope passes through each outer hole, one end of the second bending rope is fixedly connected to the transition block, and the other end is connected to the pulling device. A first bending rope passes through each inner hole, and the pulling device can pull the first bending rope and the second bending rope respectively. The diameter of the first bending rope is larger than the diameter of the second bending rope. The raw materials of the first bending rope and the second bending rope are one of Kevlar fiber and Teflon-coated stainless steel wire. The diameters of the first bending rope and the second bending rope are 0.2mm and 0.1mm respectively. The diameter of the core wire 400 in the support section 300 is 0.8mm.

[0043] Through the design of the inner and outer holes, the position and tension of the second bending rope can be better controlled, so that the guidewire has better tracking performance in the blood vessel and is easier to pass through complex vascular paths. The design of the inner and outer holes allows fine adjustment of the second bending rope, which enhances the doctor's precision in controlling the guidewire. By fixedly connecting the first and second bending ropes at the transition block, the bending and torsion of the guidewire can be better controlled, and the controllability and stability of the guidewire in the blood vessel can be improved. Kevlar fiber and Teflon-coated stainless steel wire are used as raw materials. These materials have high strength, wear resistance, cutting resistance, high temperature resistance and chemical corrosion resistance, which can improve the overall performance of the guidewire. The larger first bending rope provides better push force transmission, while the smaller second bending rope helps to maintain the flexibility and tracking performance of the distal end. This design helps to maintain pushability while not losing torsion.

[0044] The core wire 400 is made of one of nickel-titanium alloy, stainless steel and nickel-titanium / stainless steel composite alloy, and the material of the developing spring 120 is platinum-nickel alloy. Nickel-titanium alloy has a special shape memory effect and superelasticity, which makes the guide wire have good flexibility and tracking in the blood vessel, and is convenient for traveling in tortuous blood vessels. Nickel-titanium alloy has high strength, good corrosion resistance and biocompatibility, which makes the guide wire safer and more effective when used in the body. Nickel-titanium / stainless steel composite alloy combines the flexibility and superelasticity of nickel-titanium alloy with the high strength and support of stainless steel, so that the guide wire can not only navigate flexibly in the blood vessel, but also achieve effective pushing and control outside the body.

[0045] The length dimensions and radial directions of several developing springs 120 are respectively consistent, the cross-sectional outer contours of the first bending unit 110 and the second bending unit are circular, the outer diameter dimensions of several first bending units 110 are consistent, the outer diameter dimension of the developing spring 120 is consistent with the outer diameter dimension of the first bending unit 110, and the first bending unit 110 is smaller than the second bending unit close to the head section 100.

[0046] The length and radial direction of the developing spring 120 are consistent, so that the developing effect under the imaging device is more uniform and clear. The cross-sectional outer contours of the first bending unit 110 and the second bending unit are circular. This design helps the guide wire to move smoothly in the blood vessel, reduce friction with the blood vessel wall, and improve controllability. The consistency and regularity of the developing spring 120 make it possible to use the developing segment as a measurement reference in the blood vessel to help judge the length of the blood vessel. The outer diameter of the developing spring 120 is consistent with the outer diameter of the first bending unit 110, which helps to reduce the damage to the blood vessel wall when the guide wire is advanced in the blood vessel and protect the blood vessel from damage.

[0047] The dispersed developing spring 120 provides more control points, making the guide wire more maneuverable in the blood vessel, especially when passing through small and twisted blood vessels, the advantage of good maneuverability is more obvious. Compared with a long developing spring 120, the dispersed developing spring 120 can reduce metal artifacts and improve image quality. Due to its structural characteristics, the dispersed developing spring 120 can reduce fatigue fracture caused by long-term use and improve the durability of the guide wire. The dispersed developing spring 120 can reduce the torsion and rotation of the guide wire during use and improve the stability of the guide wire.

[0048] The structure of the developing spring 120 is single-strand or multi-strand, and the total length of several developing springs 120 in the head section 100 accounts for 60-80% of the length of the head section 100. The length and proportion of the developing spring 120 help the shape retention ability of the guide wire in the blood vessel, prevent kinking, enhance the flexibility and durability during use, and prevent deformation.

[0049] In the transition section 200, the outer diameter and length of the plurality of second curved units gradually decrease along the direction from the support section 300 to the head section 100. The design of gradually decreasing outer diameter and length makes the guide wire softer when approaching the head section 100, improves the flexibility of the guide wire, and makes it easier to pass through the narrow and curved parts of the blood vessel. This helps to improve the controllability and tracking of the guide wire, so that the guide wire can better adapt to the direction of the blood vessel.

[0050] The sheath material is a polymer including polyethylene and tungsten. The head coating and the transition section 200 coating are hydrophobic coatings made of one of polytetrafluoroethylene and silicone resin. The support section 300 coating is a hydrophilic coating made of one of polyurethane, polyvinyl alcohol and polyvinyl pyrrolidone.

[0051] The use of a polymer sheath made of polyethylene and tungsten can maintain flexibility and plasticity of the tip, and the hydrophilic coating can attract water molecules to form a lubricated surface on the guidewire, which reduces the friction between the guidewire and the blood vessel and improves passability. The hydrophilic coating has a very strong adhesion to the surface of the metal spring guidewire, and is not easy to fall off or precipitate substances during use, showing that the coating has excellent firmness. The low friction coefficient of the hydrophilic coating helps to reduce the damage to the inner wall of the blood vessel when the guidewire is advanced in the blood vessel, reducing the risk of vascular damage. Hydrophobic coatings such as polytetrafluoroethylene and silicone resin can provide good lubricity and reduce friction, while hydrophilic coatings such as polyurethane, polyvinyl alcohol and polyvinyl pyrrolidone can improve the lubricity and passability of the guidewire. These characteristics work together to make the guidewire have good tactile feedback, controllability, passability, lubricity and safety. The structural design of hydrophobic coating first and hydrophilic coating later improves the performance and safety of medical devices by combining the protection of the hydrophobic coating and the lubricity of the hydrophilic coating, while reducing friction and infection risks during surgery.

[0052] When in use, the first bending rope and the second bending rope are pulled respectively by the pulling device, and the adjustable bending guide wire can be bent to different degrees and precisions by pulling the first bending rope on only one side, pulling the second bending rope on only one side, pulling the first bending rope and the second bending rope on the same side, and pulling the first bending rope and the second bending rope on both sides at the same time.

[0053] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. An adjustable curved guide wire, comprising: The adjustable curved guide wire comprises a head section, a transition section and a support section, wherein a core wire is arranged on the adjustable curved guide wire, and the core wire runs through the head section, the transition section and the support section, and is characterized in that: In the head section: the core wire is conical in shape, with the tip of the cone facing away from the support section, a guide wire cylinder is fixedly arranged at the tip of the core wire, a first bending portion is arranged at the periphery of the core wire, the first bending portion includes a plurality of first bending units, and a developing spring arranged between adjacent first bending units, one developing spring is arranged between each adjacent first bending unit, each first bending unit is respectively hinged to the core wire, the hinge direction is consistent and vertically arranged, the hinge axis passes through the centroid of the first bending unit, and a head coating is arranged on the surface of each first bending unit; In the transition section: a plurality of second bending units are arranged on the periphery of the core wire, adjacent second bending units are respectively hinged, the hinge directions of the plurality of second bending units are consistent and consistent with the hinge direction of the first bending unit, the hinge axis passes through the centroid of the second bending unit, and a transition section coating is arranged on the surface of each second bending unit; In the support segment: a sheath is disposed on the periphery of the core wire, and a support segment coating is disposed on the periphery of the sheath; First bending holes are provided on both sides of the inner wall of each first bending unit, and the first bending holes on each first bending unit are located on the same horizontal plane. A first bending rope passes through each first bending hole, and one end of the first bending rope is fixedly connected to the guide wire column, and the other end is connected to a pulling device, and the pulling device is used to pull the first bending rope.

2. The adjustable curved guide wire according to claim 1, characterized in that: The core wire in the transition section is truncated cone-shaped, and the cross-sectional area of ​​one end of the core wire in the transition section connected to the core wire in the head section is smaller than the cross-sectional area of ​​the core wire in the support section.

3. The adjustable curved guide wire according to claim 1, characterized in that: A transition block is arranged between the head section and the transition section, and the transition block is fixedly connected to the core wire. A plurality of transition section bending holes are arranged on both sides of the inner wall of each second bending unit, and the transition section bending hole includes an inner hole and an outer hole. The inner hole and the outer hole are arranged on the same horizontal plane. In the transition section bending hole on each side, the inner hole is located between the outer hole and the inner wall of the second bending unit.

4. The adjustable curved guide wire according to claim 3, characterized in that: A second bending rope passes through each of the outer holes, one end of the second bending rope is fixedly connected to the transition block, and the other end is connected to the pulling device. A first bending rope passes through each of the inner holes, and the pulling device can pull the first bending rope and the second bending rope respectively.

5. The adjustable curved guide wire according to claim 4, characterized in that: The diameter of the first bending rope is greater than the diameter of the second bending rope, and the raw materials of the first bending rope and the second bending rope are one of Kevlar fiber and Teflon-coated stainless steel wire.

6. The adjustable curved guide wire according to claim 1, characterized in that: The material of the core wire is one of nickel-titanium alloy, stainless steel and nickel-titanium / stainless steel composite alloy, and the material of the developing spring is platinum-nickel alloy.

7. The adjustable curved guide wire according to claim 1, characterized in that: The length dimensions and radial directions of several of the developing springs are respectively consistent, the cross-sectional outer contours of the first bending unit and the second bending unit are circular, the outer diameter dimensions of several of the first bending units are consistent, the outer diameter dimension of the developing spring is consistent with the outer diameter dimension of the first bending unit, and the first bending unit is smaller than the second bending unit closest to the head segment.

8. The adjustable curved guide wire according to claim 1, characterized in that: The structure of the developing spring is single-strand or multi-strand, and the total length of several developing springs in the head section accounts for 60-80% of the length of the head section.

9. The adjustable curved guide wire according to claim 1, characterized in that: In the transition section, the outer diameters and lengths of a plurality of the second bending units gradually decrease in a direction from the support section to the head section.

10. The adjustable curved guide wire according to claim 1, characterized in that: The sheath material is a polymer including polyethylene and tungsten; the head coating and the transition section coating are hydrophobic coatings made of one of polytetrafluoroethylene and silicone resin; the support section coating is a hydrophilic coating made of one of polyurethane, polyvinyl alcohol and polyvinyl pyrrolidone.

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