An adjustable deflectable guide wire and its preparation method

Abstract

The present invention discloses an adjustable bending guide wire, which includes a head section, a transition section and a support section. A core wire is arranged on the adjustable bending guide wire, and the core wire penetrates through the head section, the transition section and the support section. A first bending part is arranged on the periphery of the core wire in the head section. The first bending part includes a plurality of first bending units and a developing spring arranged between adjacent first bending units. A developing spring is arranged between each adjacent first bending units. The first bending ropes and pulling devices on each first bending unit can drive a plurality of first bending units and the developing springs to bend. The developing spring can provide a moving space for the first bending units while ensuring the bending of the core wire, so that the guide wire can have sufficient bending ability and can be accurately controlled in terms of the bending angle, solving the defect of the imbalance between the adjustability and the bendability of the adjustable bending guide wire in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, specifically to medical devices for inputting media into or onto the human body, and particularly to an adjustable bending 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 path, doctors can reach almost any organ. With the continuous development of interventional medicine, the manufacturing processes of the instruments and consumables used during surgeries have been continuously refined. As an important instrument among them, the guide wire came into being.

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

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

[0005] Therefore, it is necessary to improve the guide wire in daily life to solve the above defects. Summary of the Invention

[0006] The present invention overcomes the deficiencies of the prior art and provides an adjustable bending guide wire, aiming to solve the defect of the imbalance between the adjustability and bendability of the adjustable bending guide wire in the prior art.

[0007] To achieve the above object, the technical solution adopted by the present invention is: an adjustable bending guide wire, comprising: a head section, a transition section, and a support section. A core wire is provided on the adjustable bending guide wire, and the core wire penetrates through the head section, the transition section, and the support section:

[0008] In the head section: the shape of the core wire is conical, the direction of the conical tip is away from the support section, a guide wire cylinder is fixedly provided at the tip head of the core wire, a first bending part is provided outside the core wire, the first bending part includes a plurality of first bending units, and a developing spring provided between adjacent first bending units. There is one developing spring provided between each adjacent first bending unit. Each first bending unit is respectively hinged to the core wire, the hinging directions are the same and vertically arranged, the hinging axis passes through the centroid of the first bending unit, and a head coating is provided on the outer surface of each first bending unit;

[0009] In the transition section: A number of second bending units are arranged around the core wire. The adjacent second bending units are hinged to each other respectively. The hinging directions among the number of second bending units are the same and the same as the hinging direction of the first bending unit. The hinging axis passes through the centroid of the second bending unit. A transition section coating is provided on the outer surface of each second bending unit;

[0010] In the support section: A sheath is arranged around the core wire, and a support section coating is arranged around the sheath;

[0011] On both sides of the inner wall of each first bending unit, the first bending holes are provided. 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. One end of the first bending rope is fixedly connected to the wire guiding cylinder body, and the other end is connected to a pulling device. The pulling device is used for pulling the first bending rope.

[0012] In a preferred embodiment of the present invention, the shape of the core wire in the transition section is frustum-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.

[0013] In a preferred embodiment of the present invention, a transition block is arranged between the head section and the transition section. The transition block is fixedly connected to the core wire. A number of transition section bending holes are provided on both sides of the inner wall of each second bending unit. The transition section bending holes include inner holes and outer holes. The inner holes and the outer holes are both located on the same horizontal plane. In the transition section bending holes on each side, the inner holes are located between the outer holes and the inner wall of the second bending unit.

[0014] In a preferred embodiment of the present invention, 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. The pulling device can pull the first bending rope and the second bending rope respectively.

[0015] In a preferred embodiment of the present invention, the diameter size of the first bending rope is larger than the diameter size of the second bending rope. The raw materials of the first bending rope and the second bending rope are one of Kevlar fiber and stainless steel wire with Teflon coating.

[0016] In a preferred embodiment of the present invention, the material of the core wire is one of nitinol alloy, stainless steel and nitinol / stainless steel composite alloy, and the material of the developing spring is platinum-nickel alloy.

[0017] In a preferred embodiment of the present invention, the length dimensions and radial directions of several of the developing springs are respectively the same. The outer contours of the cross-sections of the first bending unit and the second bending unit are circular. The outer diameter dimensions of several of the first bending units are the same. The outer diameter dimension of the developing spring is the same as the outer diameter dimension of the first bending unit. The first bending unit is smaller than the second bending unit close to the head section.

[0018] In a preferred embodiment of the present invention, the structure of the developing spring is single-strand or multi-strand. The total length of several of the developing springs in the head section accounts for 60 - 80% of the length of the head section.

[0019] In a preferred embodiment of the present invention, in the transition section, along the direction from the support section to the head section, the outer diameter dimensions and length dimensions of several of the second bending units gradually decrease.

[0020] 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 polyvinylpyrrolidone.

[0021] The present invention solves the defects existing in the background technology, and the present invention has the following beneficial effects:

[0022] (1) The present invention provides an adjustable bending guide wire, including a head section, a transition section, and a support section. A core wire is provided on the adjustable bending guide wire, and the core wire penetrates through the head section, the transition section, and the support section. A first bending part is provided on the periphery of the core wire in the head section. The first bending part includes several first bending units and developing springs arranged between adjacent first bending units. A developing spring is arranged between each adjacent first bending unit. The first bending ropes and pulling devices on each first bending unit can drive several first bending units and developing springs to bend. Compared with the guide wires in the prior art, the developing spring can provide a moving 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 can be accurately controlled in the bending angle, solving the defect of the imbalance between the adjustability and bendability of the adjustable bending guide wire in the prior art.

[0023] (2) In the present invention, the length dimensions and radial directions of several developing springs are respectively consistent. 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, it can help to judge the length of the blood vessel, contribute to reducing the damage to the blood vessel wall when the guide wire is advanced in the blood vessel, protect the blood vessel from damage, and the scattered developing springs provide more control points, making the maneuverability of the guide wire in the blood vessel better and capable of reducing metal artifacts and improving the image quality.

[0024] (3) In the present invention, a transition block is provided between the head segment and the transition segment. The transition block is fixedly connected to the core wire. A number of transition segment bending holes are provided on both sides of the inner wall of each second bending unit. The transition segment bending holes include inner holes and outer holes. 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 segment at the same time. 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, and the maneuverability and stability of the guide wire in the blood vessel can be improved.

[0025] (4) In the present invention, the head coating and the transition segment coating are hydrophobic coatings, and the support segment 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, reducing the friction between the guide wire and the blood vessel and improving the passability. Hydrophilic coatings such as polytetrafluoroethylene and silicone can provide good lubricity and reduce friction. The structural design of the hydrophobic coating first and then the hydrophilic coating improves the performance and safety of the medical device by combining the protectiveness of the hydrophobic coating and the lubricity of the hydrophilic coating, while reducing the friction and infection risks during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings;

[0027] Figure 1 is a three-dimensional structure diagram of a preferred embodiment of the present invention;

[0028] Figure 2 is a cross-sectional view of the transition segment of a preferred embodiment of the present invention;

[0029] Figure 3 is a side view of the head segment of a preferred embodiment of the present invention;

[0030] In the figure: 100, head section; 110, first bending unit; 120, developing spring; 200, transition section; 300, support section; 400, core wire. Detailed implementation manner

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] In the following description, many specific details are set forth in order to fully understand the present invention. However, 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 by the specific embodiments disclosed below.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is 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. Therefore, it cannot be understood as a limitation on the protection scope 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 quantity of the indicated technical features. Therefore, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0034] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood through specific situations.

[0035] Such as Figure 1 And Figure 2As shown in the figure, an adjustable bending guide wire includes a head section 100, a transition section 200, and a support section 300. A core wire 400 is provided on the adjustable bending guide wire, and the core wire 400 penetrates through the head section 100, the transition section 200, and the support section 300. Among them, 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.

[0036] As Figure 3 shown, in the head section 100: The shape of the core wire 400 is conical, and the direction of the conical tip is away from the support section 300. A guide wire cylinder is fixedly arranged at the tip of the core wire 400. A first bending part is arranged outside the core wire 400. The first bending part includes a number 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 pair of first bending units 110. Each first bending unit 110 is respectively hinged to the core wire 400. The hinging directions are the same and are vertically arranged. The hinging axis passes through the centroid of the first bending unit 110. A head coating is arranged on the outer surface of each first bending unit 110. The number of first bending units 110 is 6 - 10. The length of each first bending unit 110 is 3 - 5 mm, and the length of each developing spring 120 is 2 - 3 mm. The diameter of the tip of the core wire 400 in the head section 100 is 0.3 mm, and the diameter of the core wire 400 at the end connecting the transition section in the head section 100 is 0.5 mm.

[0037] The conical core wire 400 is designed to make the head of the guide wire more flexible, enabling it to better adapt to the bending and turning of blood vessels, and improving the accuracy and safety of the operation. Through the hinged first bending units 110 and the developing springs 120, the bending angle and shape of the guide wire can be precisely controlled, enabling the guide wire to better adapt to complex blood vessel paths. The developing springs 120 provide a moving space for the first bending units 110 while maintaining the stability of the core wire 400, so that the guide wire will not undergo excessive deformation or breakage while bending.

[0038] In the transition section 200: A number of second bending units are arranged outside the core wire 400. Adjacent second bending units are respectively hinged. The hinging directions among the number of second bending units are the same and are the same as the hinging direction of the first bending units 110. The hinging axis passes through the centroid of the second bending unit. A transition section 200 coating is arranged on the outer surface of each second bending unit. The number of second bending units is 10 - 12.

[0039] By designing the second bending units, the flexibility of the guide wire is enhanced, making it easier to pass through extremely tortuous blood vessels and collateral blood vessels. The design of the transition section 200 increases the compliance and tracking performance of the guide wire, making it less likely to sag and easier to pass through tortuous and angled blood vessels.

[0040] The first bending unit 110 and the second bending unit are made of one of platinum-tungsten alloy and nickel-titanium alloy. There is a turning space between the first bending unit 110 and the second bending unit and the core wire 400. Nickel-titanium alloy has shape memory characteristics and superelasticity, can withstand significant strain, and immediately returns to its original shape after the external stress is removed. Setting a turning space between the first bending unit 110 and the second bending unit and the core wire 400 can provide better force conduction and flexibility, making the catheter pass through the curved or narrow part of the blood vessel more smoothly and reducing the damage to the blood vessel wall.

[0041] In the support section 300: A sheath is arranged around the core wire 400, and a support section 300 coating is arranged outside 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 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.

[0042] The fine adjustment of the head section and the overall bending of the transition section form a hierarchical control logic of "fine adjustment first and then compliance": The operator first adjusts the head direction by pulling the first bending rope, and then uses the articulated structure of the transition section to follow the natural trend of the blood vessel, which not only avoids the "tail wagging" of the guide wire caused by excessive manipulation, but also prevents the guide wire from being unable to pass through complex paths due to excessive rigidity.

[0043] The rapid recovery of the developing spring and the superelastic deformation of the core wire form a dynamic deformation coupling mechanism, enabling the guide wire to temporarily adapt to the path when passing through extremely curved blood vessels and quickly reset according to the rebound of the developing spring, avoiding the "fixed shape after bending" problem caused by the single material of traditional guide wires.

[0044] On both sides of the inner wall of each first bending unit 110, there are first bending holes. The first bending holes on each first bending unit 110 are 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 cylinder, and the other end is connected to a pulling device, which is used to pull the first bending rope.

[0045] By connecting the first bending rope with the pulling device, the bending angle and shape of the guide wire can be accurately controlled, improving 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 lowered, and the safety of the operation can be improved.

[0046] If the guide wire is too rigid, it is difficult to pass through tortuous blood vessels and is likely to damage the blood vessel wall. If the flexibility of the guide wire is excessive, the pushing force transmission efficiency is low, and it is prone to kinking or getting out of control. By the elastic deformation of the imaging spring, part of the pushing force is absorbed, so that the distal flexibility adapts to the blood vessel bending. Moreover, the alternating arrangement of the imaging spring and the first bending unit can control the bending amplitude of the head section through the pulling of the first bending rope, and the imaging spring's resilience enables the first bending unit to bend autonomously, avoiding blood vessel perforation caused by a rigid structure forcibly passing through. The imaging spring absorbs the axial pressure generated during the pushing of the guide wire through compression, reducing the risk of the distal rigidity colliding with the blood vessel while maintaining sufficient pushing efficiency.

[0047] An adjustable-bend guide wire includes a head section 100, a transition section 200, and a support section 300. A core wire 400 is arranged on the adjustable-bend guide wire, and the core wire 400 penetrates through the head section 100, the transition section 200, and the support section 300. A first bending part is arranged on the periphery of the core wire 400 in the head section 100. The first bending part includes a plurality of first bending units 110 and imaging springs 120 arranged between adjacent first bending units 110. One imaging spring 120 is arranged between each adjacent pair of first bending units 110. The imaging spring 120 and the first bending spring, the first bending ropes and pulling devices on each first bending unit 110 can drive a plurality of first bending units 110 and imaging springs 120 to bend. The imaging spring 120 and the first bending unit 110 can combine their advantages to control the bending of the core wire 400 through the first bending unit 110. The imaging spring 120 can provide a moving space for the first bending unit 110 while ensuring the bending of the core wire 400, enabling the guide wire to have sufficient bending ability while being able to be precisely controlled in terms of the bending angle, and solving the defect of the imbalance between the adjustability and bendability of the adjustable-bend guide wire in the prior art.

[0048] The shape of the core wire 400 in the transition section 200 is frustum-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, enhancing the flexibility and tracking performance of the guide wire, making it easier to pass through tortuous blood vessel paths, reducing the probability of catheter kinking, and improving the pushing performance and torsional performance of the catheter. The gradual change in the cross-sectional area of the core wire 400 helps the operator better control the guide wire, improving 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 the guide wire's torsion / torque transmission, ensuring the softness and anti-deformation ability of the distal end of the guide wire while eliminating the "whip tail" phenomenon. The diameter of the core wire 400 in the transition section 200 connected to the head section end is 0.5 mm, and the diameter of the core wire 400 in the transition section 200 connected to the support section end is 0.8 mm.

[0049] There is a transition block between the head section 100 and the transition section 200. The transition block is fixedly connected to the core wire 400. A number 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 holes include inner holes and outer holes. The inner holes and the outer holes are both arranged on the same horizontal plane. Among the transition section 200 bending holes on each side, the inner holes are located between the outer holes and the inner wall of the second bending unit. The diameter of the inner hole is 0.25 mm, and the diameter of the outer hole is 0.15 mm.

[0050] The design of the transition block can reduce the impact on the core wire 400 due to the layer 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 stress, reduce the stress concentration points that occur during the use of the guide wire, and thus reduce the risk of guide wire breakage.

[0051] 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. The pulling device can pull the first bending rope and the second bending rope respectively. The diameter size of the first bending rope is larger than that of the second bending rope. The raw materials of the first bending rope and the second bending rope are one of Kevlar fiber and stainless steel wire with Teflon coating. The diameters of the first bending rope and the second bending rope are 0.2 mm and 0.1 mm respectively. The diameter of the core wire 400 in the support section 300 is 0.8 mm.

[0052] Through the design of the inner holes and the outer holes, the position and tension of the second bending rope can be better controlled, making the tracking performance of the guide wire in the blood vessel better and easier to pass through complex blood vessel paths. The design of the inner holes and the outer holes allows for fine adjustment of the second bending rope, enhancing the precision of the doctor's manipulation of the guide wire. By fixedly connecting the first bending rope and the second bending rope at the transition block, the bending and twisting of the guide wire can be better controlled, improving the maneuverability and stability of the guide wire in the blood vessel. Using Kevlar fiber and stainless steel wire with Teflon coating as raw materials, these materials have the characteristics of high strength, wear resistance, cut resistance, high temperature resistance and chemical corrosion resistance, which can improve the overall performance of the guide wire. The larger first bending rope provides better push force transmission, while the smaller second bending rope helps to maintain the compliance and tracking performance at the distal end. Such a design helps to maintain the pushability while not losing the torsional performance.

[0053] The material of the core wire 400 is one of nitinol alloy, stainless steel, and nitinol / stainless steel composite alloy, and the material of the visualization spring 120 is platinum-nickel alloy. Nitinol alloy has special shape memory effect and superelasticity, enabling the guide wire to have good flexibility and trackability in blood vessels, facilitating its movement in tortuous blood vessels. Nitinol alloy has high strength, good corrosion resistance, and biocompatibility, which make the guide wire safer and more effective when used in the body. The nitinol / stainless steel composite alloy combines the flexibility and superelasticity of nitinol alloy with the high strength and support of stainless steel, enabling the guide wire to be able to navigate flexibly in blood vessels and achieve effective pushing and control outside the body.

[0054] The length dimensions and radial directions of several visualization springs 120 are respectively consistent. The outer contour of the cross-section of the first bending unit 110 and the second bending unit is circular. The outer diameter dimensions of several first bending units 110 are the same. The outer diameter dimension of the visualization spring 120 is the same as that of the first bending unit 110. The first bending unit 110 is smaller than the second bending unit near the most head section 100.

[0055] The length dimensions and radial directions of the visualization springs 120 are consistent, making the visualization effect more uniform and clear under imaging equipment. The outer contour of the cross-section of the first bending unit 110 and the second bending unit is circular. This design helps the guide wire to move smoothly in blood vessels, reduce friction with the blood vessel wall, and improve the maneuverability. The consistency and regularity of the visualization springs 120 enable the use of the visualization segments as measurement references in blood vessels to help judge the length of blood vessels. The outer diameter dimension of the visualization spring 120 is the same as that 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 protects the blood vessel from damage.

[0056] The dispersed visualization springs 120 provide more manipulation points, making the maneuverability of the guide wire in blood vessels better. Especially when passing through small and tortuous blood vessels, the advantage of good maneuverability is more obvious. Compared with a long strip of visualization spring 120, the dispersed visualization springs 120 can reduce metal artifacts and improve the image quality. Due to its structural characteristics, the dispersed visualization springs 120 can reduce fatigue fracture caused by long-term use and improve the durability of the guide wire. The dispersed visualization springs 120 can reduce the torsion and rotation of the guide wire during use and improve the stability of the guide wire.

[0057] The structure of the visualization spring 120 is single-strand or multi-strand. The total length of several visualization 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 visualization spring 120 contribute to the shape retention ability of the guide wire in blood vessels, prevent kinking, enhance flexibility and durability during use, and are not easily deformed.

[0058] In the transition section 200, the outer diameter and length dimensions of a number of second bending units gradually decrease in the direction from the support section 300 towards the head section 100. The design of gradually decreasing outer diameter and length dimensions 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 blood vessels. This helps to improve the maneuverability and trackability of the guide wire, enabling the guide wire to better adapt to the trend of blood vessels.

[0059] The sheath material is a polymer, including polyethylene and tungsten. The head coating and the coating of the transition section 200 are hydrophobic coatings, and the material used is one of polytetrafluoroethylene and silicone resin. The coating of the support section 300 is a hydrophilic coating, and the material used is one of polyurethane, polyvinyl alcohol, and polyvinylpyrrolidone.

[0060] The polymer sheath made of polyethylene and tungsten can maintain flexibility and tip plasticity. The hydrophilic coating can attract water molecules, form a lubricating surface on the guide wire, reduce the friction between the guide wire and blood vessels, and improve the passing ability. The hydrophilic coating has extremely strong adhesion to the surface of the metal spring guide wire, is not easy to fall off and precipitate substances during use, indicating that the coating has excellent firmness. The low friction coefficient of the hydrophilic coating helps to reduce the damage to the inner wall of blood vessels when the guide wire is advanced in the blood vessels and reduces the risk of blood vessel 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 polyvinylpyrrolidone can improve the lubricity and passing ability of the guide wire. These characteristics work together to make the guide wire have good tactile feedback, maneuverability, passing ability, lubricity, and safety. The structural design of the hydrophobic coating first and then the hydrophilic coating improves the performance and safety of the medical device by combining the protectiveness of the hydrophobic coating and the lubricity of the hydrophilic coating, while reducing the friction and infection risk during the operation.

[0061] During use, the first bending rope and the second bending rope are respectively pulled by a pulling device, and the adjustable bending guide wire can be bent to different degrees and precisions by pulling only one side of the first bending rope, pulling only one side of the second bending rope, 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.

[0062] Based on the ideal embodiments of the present invention as inspiration, through the above description, relevant personnel can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this 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 a head section, a transition section and a support section connected in sequence, wherein 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, and is characterized in that: In the head section: the core wire is in a cone shape, with the tip of the cone facing away from the support section, a guide wire column is fixedly arranged at the tip of the core wire, the head section is provided with a first bending portion 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; the developing spring has a single strand or multiple strands, and the total length of the plurality of developing springs in the head section accounts for 60-80% of the length of the head section; In the transition section: the transition section is provided with a plurality of second bending units 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 provided on the surface of each second bending unit; along the direction from the support section to the head section, the outer diameter and length of the plurality of second bending units gradually decrease; In the support segment: the support segment is provided with a sheath on the periphery of the core wire, and a support segment coating is provided 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 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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