Magnetic control guide wire

Abstract

The utility model discloses a magnetic control guide wire, including rigid core silk, flexible core silk, winding spring part and magnetic head part, the one end of rigid core silk is provided with flexible core silk, is provided with winding spring part around on flexible core silk, the one end of flexible core silk is away from rigid core silk and is provided with magnetic head part, the magnetic head part includes the magnetic body of the solid magnetic material one body and is made, and the one end of flexible core silk is away from rigid core silk and extends to the magnetic body inside, the present application replaces the mode that the flexible magnetic powder is inlaid in the core silk distal end or the existing magnetized stainless steel distal end by the magnetic body of permanent magnet, makes the magnetic control guide wire's magnetic intensity significantly enhances, and the response to external magnetic field is more sensitive and will not demagnetize, can realize greater turning angle and higher control precision, the combination of winding spring part and flexible core silk has promoted the guide wire flexibility, can better comply with the tortuous shape of blood vessel, reduces the risk of blood vessel injury.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a magnetically controlled guidewire. Background Technology

[0002] Microguidewires are indispensable surgical instruments in interventional vascular treatment, playing a crucial role in establishing the access route and supporting subsequent treatment instruments such as microcatheters to reach the target vessel. However, the human blood vessels have numerous branches, and accurately delivering the guidewire to the target vessel among these branches is an extremely challenging task for surgeons. In current mature guidewire designs and surgical procedures, surgeons typically pre-bend and shape the guidewire tip, then push and rotate the proximal end to deliver the guidewire to the target.

[0003] To address the challenges surgeons face in manipulating guidewires and navigating them to select target vessels, magnetically controlled guidewires have emerged in recent years. These guidewires utilize magnetic materials at the tip, combined with an external magnetic field, to allow the tip to bend and easily select the target vessel, significantly simplifying surgical procedures and reducing operation time. However, current magnetically controlled guidewires still retain certain drawbacks.

[0004] In existing technologies, the distal end of the core wire is typically magnetized to make it magnetic, or flexible magnetic powder is integrated into the distal end of the core wire to make it magnetic. Then, an external magnetic field is used to complete the deflection of the guide wire. However, the magnetic strength of this design is low and it is easy to demagnetize, resulting in poor sensitivity and turning effect.

[0005] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a magnetically controlled guide wire, which aims to solve the problem that the guide wire in the prior art has weak magnetism, resulting in poor sensitivity and turning effect.

[0007] The technical solution adopted by this utility model to solve the technical problem is as follows:

[0008] A magnetically controlled guide wire includes: a rigid core wire, a flexible core wire disposed at one end of the rigid core wire, and a spring portion surrounding the surface of the flexible core wire, wherein a magnetic head is disposed at the end of the flexible core wire away from the rigid core wire.

[0009] The magnetic head includes a magnetic body integrally made of solid magnetic material, and the flexible core wire extends to the inside of the magnetic body from one end away from the rigid core wire.

[0010] Furthermore, the coiled spring portion includes:

[0011] The first spring section is arranged around the surface of the flexible core wire and is located at the end of the flexible core wire away from the rigid core wire;

[0012] The second spring section is arranged around the surface of the flexible core wire and is either in contact with or spaced apart from the magnetic body.

[0013] Furthermore, the diameter of the spring wire in the first spring section is less than or equal to the diameter of the spring wire in the second spring section;

[0014] The length of the first spring segment is greater than or equal to the length of the magnetic body;

[0015] The first spring segment includes a first spring, which is a developing spring.

[0016] Furthermore, the magnetic body has a ring-shaped or semi-ring-shaped structure; the magnetic body is sleeved on the outer surface of the flexible core wire, or the magnetic body is sleeved on the outer surface of the first winding spring segment.

[0017] Furthermore, the magnetic head also includes an end portion disposed at the distal end of the flexible core wire, the end portion being fixedly connected to the magnetic body; the side of the end portion away from the magnetic body is arc-shaped.

[0018] Furthermore, both the end and the magnetic body are made of solid magnetic material and are integrally formed; the diameter of the connection surface between the end and the magnetic body is the same as the diameter of the magnetic body.

[0019] Furthermore, the flexible core wire includes a flexible segment, a first plateau segment, and a first tapered segment. The flexible segment is disposed at the end of the first plateau segment away from the rigid core wire. The flexible segment and the first plateau segment are smoothly transitioned through the first tapered segment. The diameter of the flexible segment is smaller than the diameter of the first plateau segment, and the diameter of the first plateau segment is smaller than the diameter of the rigid core wire.

[0020] The first spring segment is disposed on the flexible segment, and the second spring segment is disposed on the first platform segment, with the distal end of the second spring segment at least partially overlapping the flexible segment.

[0021] Furthermore, it also includes an outer tube, which covers the outer surface of the magnetic head and the second spring segment.

[0022] Furthermore, the stiffness of the second spring segment gradually decreases from the end closest to the rigid core wire to the end furthest from the rigid core wire.

[0023] Furthermore, the second spring segment includes multiple second springs, and the multiple second spring segments are connected end to end in sequence;

[0024] The diameter of the plurality of second winding springs and / or the diameter of the spring wires gradually decreases from the end closer to the rigid core wire to the end farther away from the rigid core wire;

[0025] Multiple second coiled springs are connected by twisting and / or welding.

[0026] Furthermore, the spring portion includes a second spring segment, which is disposed around the surface of the flexible core wire and abuts against the magnetic body;

[0027] The second spring segment is a developing spring, or the outer surface of the second spring segment is provided with a developing coating;

[0028] The magnetic body is fixedly connected to the flexible core wire.

[0029] Compared with the prior art, the beneficial effects of this utility model are:

[0030] In this invention, a flexible core wire is provided at one end of a rigid core wire, and a spring is arranged around the flexible core wire. A magnetic head is provided at the end of the flexible core wire away from the rigid core wire. The magnetic head includes a magnetic body integrally made of solid magnetic material, and the end of the flexible core wire away from the rigid core wire extends into the magnetic body. This application significantly enhances the magnetic strength of the magnetic guide wire by replacing the existing magnetized stainless steel distal end with the magnetic body of a permanent magnet or by embedding flexible magnetic powder at the distal end of the core wire. This makes the magnetic guide wire more sensitive to external magnetic fields and prevents demagnetization, enabling a larger turning angle and higher control precision. The combination of the spring and the flexible core wire improves the flexibility of the guide wire, allowing it to better conform to the tortuous shape of blood vessels and reduce the risk of blood vessel damage. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0032] Figure 2 This is a schematic diagram of the spring winding part of this utility model.

[0033] Figure 3 for Figure 2 Enlarged diagram of point A in the diagram.

[0034] Figure 4 This is a schematic diagram of the flexible core wire structure of this utility model.

[0035] Figure 5 This is a schematic diagram of the first structural state of the first coiled spring of this utility model.

[0036] Figure 6 This is a schematic diagram of the second structural state of the first coiled spring of this utility model.

[0037] Figure 7This is a schematic diagram of the third structural state of the first coiled spring of this utility model.

[0038] Figure 8 This is a schematic diagram of the second coiled spring structure of this utility model.

[0039] The numbers in the diagram represent: 1. Rigid core wire; 2. Flexible core wire; 21. Flexible segment; 22. First platform segment; 23. First conical segment; 24. Second platform segment; 25. Second conical segment; 3. Spring section; 31. First spring segment; 311. First spring; 32. Second spring segment; 321. Second spring; 4. Magnetic head; 41. Magnetic body; 42. End; 5. Outer tube. Detailed Implementation

[0040] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0041] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] In view of the shortcomings of the prior art, this embodiment provides a magnetically controlled guide wire, which can be referred to as follows:

[0044] To more clearly describe the structural features of this application, the terms "proximal" and "distal" are used as directional terms, where "proximal" refers to the end closer to the operator during the operation, and "distal" refers to the end farther away from the operator.

[0045] As attached Figure 1 and attached Figure 5 As shown, a magnetically controlled guidewire includes a rigid core wire 1, a flexible core wire 2, a spring-wound portion 3, and a magnetic head 4. The rigid core wire 1 can be a stainless steel wire, and the flexible core wire 2 can be a nickel-titanium wire. The flexible core wire 2 is disposed at one end of the rigid core wire 1 and is used for intervention inside a blood vessel. The spring-wound portion 3 is disposed around the surface of the flexible core wire 2. The magnetic head 4 is disposed at the end of the flexible core wire 2 away from the rigid core wire 1. The magnetic head 4 includes a magnetic body 41 integrally made of a solid magnetic material. The end of the flexible core wire 2 away from the rigid core wire 1 extends into the magnetic body 41, and the magnetic body 41 can drive the flexible core wire 2 to move or turn under the action of an external magnetic field, thereby allowing it to be inserted into a tortuous blood vessel.

[0046] In this embodiment, the magnetic body 41 has a ring-shaped or semi-ring-shaped structure and is sleeved on the outside of the flexible core wire 2, thereby improving assembly stability. The rigid core wire 1 is typically made of stainless steel wire, which, with its good elastic modulus and hardness, can stably transmit the pushing force, ensuring that the guidewire will not easily bend or deform during doctor's manipulation. Its good biocompatibility and corrosion resistance can meet the needs of repeated clinical disinfection. The flexible core wire 2 is mostly made of nickel-titanium alloy wire, with a phase transition temperature lower than human body temperature. It exhibits a superelastic state within the blood vessel, allowing it to flexibly adapt to tortuous blood vessels and reduce frictional damage to the vascular endothelium. It is welded to the rigid core wire 1 through a nickel-titanium sleeve. The coiled spring part 3 can be precisely wound from nickel-titanium alloy or medical spring steel wire, allowing it to bend with the blood vessel. By adjusting the diameter and pitch of the coiled spring, the bending stiffness of the distal end of the guidewire can be customized to adapt to blood vessels of different diameters.

[0047] In actual use, the magnetic body 41 and the flexible core wire 2 are first inserted into the blood vessel. Under the push of the rigid core wire 1, they slowly enter the blood vessel. When they reach the turning point, the doctor applies a magnetic field through the magnetic control device. The magnetic body 41 is driven by the magnetic force to turn the flexible core wire 2 and the spring part 3. The position of the flexible core wire 2 is observed in conjunction with angiography. The direction of the magnetic field is adjusted to allow the guide wire to enter the target branch blood vessel. After reaching the target point, the magnetic field is withdrawn. The guide wire is kept stable by the elasticity of the spring part 3, which facilitates the subsequent microcatheter follow-up.

[0048] Compared to existing methods that use magnetized stainless steel or flexible magnetic powder embedded at the distal end of the core wire, this magnetically controlled microguidewire offers significant advantages. Existing magnetically controlled guidewires suffer from weak magnetism, resulting in poor sensitivity and turning performance. This application addresses this by incorporating a flexible core wire 2 at one end of a rigid core wire 1, with a spring-like portion 3 surrounding the flexible core wire 2. A magnetic body 41 is located at the end of the flexible guidewire furthest from the rigid guidewire. This design, by replacing magnetized stainless steel or embedding flexible magnetic powder at the distal end of the core wire with a magnetic body 41 (such as neodymium iron boron permanent magnets), significantly enhances magnetic strength without demagnetization, resulting in a more sensitive response to external magnetic fields and enabling larger turning angles and higher control precision. The combination of the spring-like portion 3 and the flexible core wire 2 improves guidewire flexibility, allowing it to better conform to the tortuous shape of blood vessels and reduce the risk of vascular injury. In practical applications, this approach can shorten the time required to select complex vascular branches, improve surgical success rates, reduce complication rates, and effectively solve the problems of difficult manipulation and poor turning performance of existing magnetically controlled guidewires, providing a more efficient and safer instrument option for vascular interventional therapy.

[0049] In this embodiment, as shown in the appendix Figure 2 and attached Figure 3 As shown, the spring section 3 includes a first spring section 31 and a second spring section 32. Both the first spring section 31 and the second spring section 32 are arranged around the surface of the flexible core wire 2. The first spring section 31 is closer to the side of the flexible core wire 2 away from the rigid core wire 1. The magnetic body 41 is sleeved on the outer surface of the first spring section 31, or the magnetic body 41 is sleeved on the outer surface of the flexible core wire 2. The second spring section 32 abuts against or is spaced from the side wall of the magnetic body 41.

[0050] The spring section 3 adopts a double-spring structure design, consisting of a first spring section 31 and a second spring section 32, both of which wrap around the surface of the flexible core wire 2, forming a composite protection and performance enhancement for the guidewire. The first spring section 31 is located at the end of the flexible core wire 2 away from the rigid core wire 1, directly undertaking the distal operation requirements during interventional vascular procedures. It is made of high-strength medical-grade nickel-titanium alloy wire, stainless steel, or platinum-tungsten material with imaging capabilities, and is wound with an extremely small pitch using precision CNC equipment. This tight helical structure gives it excellent flexibility and torsional resistance, allowing for flexible turning when entering vascular branches. The magnetic body 41 is precisely fitted onto the outer surface of the first spring section 31, and the two are bonded and fixed with medical-grade epoxy resin adhesive, or by welding or other methods, ensuring that the magnetic body 41 and the first spring section 31 maintain coaxial rotation under magnetic field drive, avoiding deviation that could affect the guidewire control accuracy.

[0051] As attached Figure 2 Appendix Figure 5 and attached Figure 6As shown, the second spring segment 32 is located on the side of the magnetic body 41 near the rigid core wire 1, and can be in two forms: sidewall contact or spaced distribution with the magnetic body 41. If it is in contact (as shown in the attached diagram)... Figure 2 As shown), it can further enhance the overall structural strength of the coiled spring part 3 and reduce the relative displacement between components when pushing the guide wire; if it is in an intermittent state (as shown in the attached figure) Figure 5 and attached Figure 6 As shown in the figure, a buffer gap can be formed between the two spring sections, allowing the guide wire to have more deformation space during bending and effectively reducing stress concentration.

[0052] The second spring section 32 is differentiated from the first spring section 31 in terms of wire material selection and winding process. For example, the pitch can be appropriately increased or spring steel of different hardness can be used to adjust the overall stiffness gradient of the spring section 3, gradually transitioning from moderate rigidity near the rigid core wire 1 end to extreme flexibility at the distal end of the first spring section 31, thus meeting the dual requirements of guidewire controllability and stability in different vascular intervention scenarios.

[0053] The first spring segment 31 includes a first spring 311, which is a radiopaque spring and can be made of platinum. Platinum springs and other springs with radiopaque properties under X-ray (the magnetic body 41 is made of a solid magnetic material and also has radiopaque properties under X-ray; combined with the radiopaque effect of the first spring 311, it makes it easier to observe the position of the guidewire). The outer diameter of the core wire of the first spring 311 is 0.01-0.1mm, and the outer diameter of the first spring 311 matches the inner diameter of the magnetic body 41, allowing the magnetic body 41 to be installed on the first spring 311. The length of the first spring 311 can be selected from 10mm to 50mm. This first spring 311 enables the guidewire to have X-ray radiopaque properties, and compared to the 1-2mm radiopaque length of conventional microcatheters, it makes it easier for doctors to distinguish the position of the flexible core wire 2 under fluoroscopy.

[0054] In this embodiment, the diameter of the spring wire in the first spring section 31 is less than or equal to the diameter of the spring wire in the second spring section 32.

[0055] When the diameter of the spring wire in the first spring section 31 is smaller than the diameter of the spring wire in the second spring section 32, not only can the size of the magnetic body 41 be increased, but also different elastic forces of the spring section 3 can be realized, so as to facilitate the control of the guide wire turning.

[0056] When the diameter of the spring wire in the first spring section 31 is equal to the diameter of the spring wire in the second spring section 32, the consistency of the elastic force of the spring section 3 can be effectively maintained, and the influence caused by the different elastic forces in each section of the spring section 3 can be avoided.

[0057] In this embodiment, as shown in the appendix Figure 5 Appendix Figure 6 and attached Figure 7As shown, the length of the first spring segment 31 is greater than or equal to the length of the magnetic body 41.

[0058] When the length of the first coiled spring segment 31 is equal to the length of the magnetic body 41, the two are connected, which can provide all-round support for the magnetic body 41 and prevent it from axially moving under the impact of blood flow or repeated action of external magnetic field in the blood vessel. At the same time, the longer first coiled spring segment 31 can provide a larger torque transmission area, so that the steering force generated by the magnetic body 41 can be transmitted to the flexible core wire 2 more evenly, ensuring smooth movement and sensitive response when the guide wire turns, and effectively avoiding control delay or directional deviation caused by uneven force transmission.

[0059] Further details are attached. Figure 7 As shown, when the length of the spring wire in the first spring segment 31 is equal to the length of the magnetic body 41, the diameter of the spring wire in the first spring segment 31 is the same, thereby ensuring the stability of the first spring segment 31.

[0060] When the length of the first spring section 31 is greater than the length of the magnetic body 41, it can not only provide better support for the flexible core wire 2, but also facilitate the connection between the first spring section 31 and the fixed magnetic ring.

[0061] Further details are attached. Figure 6 As shown, when the length of the spring wire in the first spring section 31 is greater than the length of the magnetic body 41, the diameter of the spring wire in the first spring section 31 located inside the magnetic body 41 and outside the magnetic body 41 is the same, thereby maintaining the consistency of the spring winding.

[0062] Further details are attached. Figure 5 As shown, when the length of the spring wire in the first spring section 31 is greater than the length of the magnetic body 41, the spring section inside the magnetic body 41 and the spring section outside the magnetic body 41 can be a separate component or an integral component with the same inner and outer diameters, or they can be a separate component or an integral component with the same inner diameter and different outer diameters.

[0063] In this embodiment, as shown in the appendix Figure 4 As shown, the flexible core wire 2 includes a flexible segment 21, a first platform segment 22 and a first tapered segment 23. The flexible segment 21 is located at the end of the first platform segment 22 away from the rigid guide wire. The flexible segment 21 and the first platform segment 22 are smoothly transitioned through the first tapered segment 23. The diameter of the flexible segment 21 is smaller than the diameter of the first platform segment 22, and the diameter of the first platform segment 22 is smaller than the diameter of the rigid core wire 1.

[0064] The first spring section 31 is disposed on the flexible section 21, and the second spring section 32 is disposed on the first platform section 22, with the distal end of the second spring section 32 at least partially overlapping with the flexible section 21 to provide support.

[0065] In this embodiment, a second tapered segment 25 and a second platform segment 24 are sequentially provided at one end of the first platform segment 22 near the rigid core wire 1. The first platform segment 22 smoothly transitions to the second platform segment 24 through the second tapered segment 25, and the diameter of the second platform segment 24 is greater than the diameter of the first platform segment 22. The diameter of the second platform segment 24 is equal to the diameter of the rigid core wire 1, and the second platform segment 24 is connected to the rigid core wire 1.

[0066] The second platform segment 24 has an outer diameter of 0.20-0.60 mm and a length of 30-150 mm; the second conical segment 25 and the first conical segment 23 have lengths of 20-250 mm; the first platform segment 22 has an outer diameter of 0.10-0.50 mm and a length of 50-200 mm; and the flexible segment 21 has an outer diameter of 0.02-0.15 mm and a length of 2-50 mm.

[0067] In other embodiments, the diameter of the second spring segment 32 can be set in a multi-step manner. The multi-step of the second spring segment 32 corresponds one-to-one with the platform segment and the conical segment on the flexible core wire 2, so as to ensure that the second spring segment 32 is attached to the surface of the flexible core wire 2 and can provide better support.

[0068] In this embodiment, as shown in the appendix Figure 3 As shown, the magnetic guide wire also includes an outer tube 5, which covers the surface of the magnetic head 4 and the second spring section 32.

[0069] The wall thickness of the outer tube 5 can be selected as 0.01-0.1 mm, and the tube length can be selected as 10-100 mm. The addition of the outer tube 5 reduces the friction between the guidewire tip and the inner wall of the blood vessel, making it easier for the guidewire to enter tortuous blood vessels.

[0070] In this embodiment, as shown in the appendix Figure 1 and attached Figure 5 As shown, the magnetic head 4 includes an end 42 disposed at the distal end of the flexible core wire 2. The end 42 is fixedly connected to the magnetic body 41, and the side of the end 42 away from the magnetic body 41 is arc-shaped. The diameter of the connection surface between the end 42 and the magnetic body 41 is the same as the diameter of the magnetic body 41, so as to ensure a smooth transition at the entry end of the microguidewire, making the magnetically controlled guidewire pushing process smoother, effectively avoiding operation delays or errors caused by jamming, and improving the accuracy and efficiency of interventional surgery.

[0071] One end of the magnetic body 41 is equipped with a tip 42 structure, which brings multiple performance improvements to the magnetically controlled guidewire. The tip 42 is made of medical-grade polymer material or biocompatible metal (such as titanium alloy), and is precision-machined to seamlessly connect with the end of the magnetic body 41, forming a smooth and rounded arc shape. This design significantly reduces the resistance of the guidewire when traveling in blood vessels. When the guidewire passes through narrow blood vessels or complex branches, the tip 42 can effectively avoid rubbing or snagging with the vessel wall, reducing the risk of damage to the vascular endothelium and improving surgical safety.

[0072] In other embodiments, both the magnetic body 41 and the end 42 are made of solid magnetic material and integrally formed, thereby further enhancing the magnetism of the magnetic head 4. When the end 42 is magnetic, the magnetic body 41 and the end 42 are integrally formed of plastic magnetic material.

[0073] In this embodiment, the hardness of the second spring segment 32 gradually decreases from the end closer to the rigid core wire 1 to the end farther away from the rigid core wire 1.

[0074] By combining the variable diameter design of the nickel-titanium wire with the design of multiple spring sections with different hardness, the guide wire can meet the requirements of magnetic control flexibility while also providing a certain degree of support, making the hardness transition of the flexible core wire 2 smoother.

[0075] Furthermore, the diameter of the second spring segment 32 or the diameter of the spring wire gradually decreases from the end closer to the rigid core wire 1 to the end farther away from the rigid core wire 1, so as to achieve a change in the hardness of the second spring segment 32.

[0076] In this embodiment, as shown in the appendix Figure 6 As shown, the second spring segment 32 includes multiple second springs 321, which are connected end to end in sequence. The diameter of the multiple second springs 321 and / or the diameter of the spring wire gradually decreases from the end closer to the rigid core wire 1 to the end farther away from the rigid core wire 1. Adjacent second springs 321 are connected by twisting and / or welding.

[0077] Specifically, when connecting two adjacent second coiled springs 321, the pitch at the joint of the two second coiled springs 321 is appropriately increased, the two second coiled springs 321 are wound together, and then the two second springs are welded together by welding. Then, as a whole spring, it is welded to the nickel-titanium core wire by welding or other methods. Alternatively, the coiled springs twisted together at both ends can be installed on the nickel-titanium core wire and then welded together. Or, the two second coiled springs 321 can be directly welded together and then welded to the nickel-titanium core wire.

[0078] The second spring segment 32 can be selected from nickel-titanium springs or stainless steel springs according to the hardness requirements. The outer diameter of the spring wire in the second spring segment 32 can be 0.02-0.15mm, the outer diameter of the second spring segment 32 can be 0.2-0.5mm, and the length of the second spring segment 32 can be 10-300mm. When using multiple spring segments, such as multiple second springs 321, it is preferable to select nickel-titanium material for the multiple second springs 321 near the magnetic head 4, and to select 304 stainless steel material for the multiple second springs 321 near the rigid core wire 1. By decreasing the hardness of the second spring segment 32 sequentially from the rigid core wire 1 to the flexible core wire 2, and in conjunction with the change in the outer diameter of the nickel-titanium core wire, the hardness of the guide wire gradually decreases from the proximal end to the distal end, fully coordinating and ensuring the requirements of guide wire flexibility and support.

[0079] In other embodiments, as shown in the appendix Figure 8 As shown, the magnetically controlled guide wire includes a second spring section 32 and a magnetic head 4. The second spring section 32 is arranged around the surface of the flexible core wire 2. The magnetic body 41 abuts against the second spring section 32, and the magnetic head 4 is fixedly connected to the flexible core wire 2.

[0080] Specifically, one end of the second spring segment 32 is disposed on the first platform segment 22, and the other end is connected to the magnetic body 41. The magnetic body 41 is directly sleeved on the flexible segment 21 to increase the radial dimension of the magnetic body 41, thereby increasing the magnetic strength of the magnetic body 41. Furthermore, the second spring segment 32 is a developing spring, or the outer surface of the second spring segment 32 is provided with a developing coating, which can be a gold plating, platinum plating, etc.

[0081] In this embodiment, the surfaces of the magnetic body 41, the second spring segment 32, and the rigid core wire 1 are provided with a plating or coating to make the magnetic body 41, the second spring segment 32, and the rigid core wire 1 biocompatible.

[0082] The plating can be a metal plating or a polymer plating, and the coating can be a metal coating or a polymer coating, so that the magnetic body 41 and the spring part 3 are biocompatible, and at the same time, the magnetic body 41 and the spring part 3 can be prevented from rusting.

[0083] The magnetic body 41 has an inner diameter of 0.05-0.3 mm, an outer diameter of 0.15-0.06 mm, and a length of 0.5-5 mm.

[0084] Furthermore, the coating on the outer surface of the magnetic body 41 and the second spring section 32 is a hydrophilic coating, while the coating on the outer surface of the rigid core wire 1 is a hydrophobic coating.

[0085] A hydrophilic coating is applied to the area between the magnetic body 41 and the second spring section 32, with a coating length of 100-600 mm and a coating thickness of 0.001-0.015 mm. This coating makes the magnetic body 41 and the second spring section 32 more lubricated, reducing friction between the guidewire and the inner wall of the blood vessel, reducing damage to the blood vessel, and making it easier for the flexible core wire 2 to enter the tortuous diseased blood vessel. The outer surface of the rigid core wire 1 is coated with a hydrophobic coating with a coating thickness of 0.001-0.015 mm. This coating can reduce the friction on the surface of the rigid core wire 1, significantly reducing friction between the rigid core wire 1 and the blood vessel wall, catheter, or other instruments.

[0086] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the solutions disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the claims.

Claims

1. A magnetically controlled guide wire, characterized in that, include: The rigid core wire, the flexible core wire disposed at one end of the rigid core wire, and the spring portion surrounding the surface of the flexible core wire, wherein a magnetic head is disposed at the end of the flexible core wire away from the rigid core wire; The magnetic head includes a magnetic body integrally made of solid magnetic material, and the flexible core wire extends to the inside of the magnetic body from one end away from the rigid core wire.

2. The magnetically controlled guide wire according to claim 1, characterized in that, The coiled spring portion includes: The first spring section is arranged around the surface of the flexible core wire and is located at the end of the flexible core wire away from the rigid core wire; The second spring section is arranged around the surface of the flexible core wire and is either in contact with or spaced apart from the magnetic body.

3. A magnetically controlled guide wire according to claim 2, characterized in that, The diameter of the spring wire in the first spring section is less than or equal to the diameter of the spring wire in the second spring section; The length of the first spring segment is greater than or equal to the length of the magnetic body; The first spring segment includes a first spring, which is a developing spring.

4. A magnetically controlled guide wire according to claim 2, characterized in that, The magnetic body has a ring-shaped or semi-ring-shaped structure; the magnetic body is sleeved on the outer surface of the flexible core wire, or the magnetic body is sleeved on the outer surface of the first winding spring segment.

5. A magnetically controlled guide wire according to claim 4, characterized in that, The magnetic head also includes an end cap disposed at the distal end of the flexible core wire, the end cap being fixedly connected to the magnetic body; the side of the end cap away from the magnetic body is arc-shaped.

6. A magnetically controlled guide wire according to claim 5, characterized in that, Both the end cap and the magnetic body are made of solid magnetic material and are integrally formed; the diameter of the connection surface between the end cap and the magnetic body is the same as the diameter of the magnetic body.

7. A magnetically controlled guide wire according to claim 2, characterized in that, The flexible core wire includes a flexible segment, a first plateau segment, and a first tapered segment. The flexible segment is disposed at the end of the first plateau segment away from the rigid core wire. The flexible segment and the first plateau segment are smoothly transitioned through the first tapered segment. The diameter of the flexible segment is smaller than the diameter of the first plateau segment, and the diameter of the first plateau segment is smaller than the diameter of the rigid core wire. The first spring segment is disposed on the flexible segment, and the second spring segment is disposed on the first platform segment, with the distal end of the second spring segment at least partially overlapping the flexible segment.

8. A magnetically controlled guide wire according to claim 2, characterized in that, It also includes an outer tube, which covers the outer surface of the magnetic head and the second spring segment.

9. A magnetically controlled guide wire according to claim 2, characterized in that, The stiffness of the second spring segment gradually decreases from the end closest to the rigid core wire to the end furthest from the rigid core wire.

10. A magnetically controlled guide wire according to claim 9, characterized in that, The second spring segment includes multiple second springs, and the multiple second spring segments are connected end to end in sequence; The diameter of the plurality of second winding springs and / or the diameter of the spring wires gradually decreases from the end closer to the rigid core wire to the end farther away from the rigid core wire; Multiple second coiled springs are connected by twisting and / or welding.

11. A magnetically controlled guide wire according to claim 1, characterized in that, The spring section includes a second spring segment, which is arranged around the surface of the flexible core wire and abuts against the magnetic body; The second spring segment is a developing spring, or the outer surface of the second spring segment is provided with a developing coating; The magnetic body is fixedly connected to the flexible core wire.

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