Guide wire

Abstract

The utility model discloses a guide wire which comprises a coil body, a first coil and a second coil, and a connector is connected between the first coil and the second coil. The front end combination body is arranged on one side of the coil body; the core wire body is arranged on the other side of the coil body, the core wire body comprises a main body and a tapered reducing end which is formed by extending from the main body to the coil body, and the diameter of the reducing end is gradually reduced from one end close to the main body to one end far away from the main body. According to the utility model, the supporting transition of the guide wire is very smooth by arranging the longer reducing end, the guide wire has better controllability and tactile feedback performance and better tip hardness by arranging the integrated core wire body, and the diameter of the reducing end is gradually reduced from one end close to the main body to one end far away from the main body, so that the supporting transition of the guide wire is very smooth. The characteristics of high supporting performance and excellent pushing force of the guide wire are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a guide wire. Background Art

[0002] Guidewire is a general term for a large category of medical devices, including microguidewires, guide guidewires and angiographic guidewires; according to their function, they can be divided into working guidewires and chronic total occlusion lesion guidewires.

[0003] The guidewire is one of the basic instruments in interventional surgery. It has the function of introducing the catheter percutaneously into the blood vessel or other lumens of the body. It is also an important tool to assist the catheter in selectively entering small blood vessel branches or other diseased cavities, as well as to replace the catheter during the operation.

[0004] The guide wire is generally composed of an inner and outer part. The cavity in the center of the spring is the interior of the guide wire, which is equipped with a straight and hard steel wire core. Depending on the needs, the material can be stainless steel wire or nickel-titanium alloy, and sometimes both are used together. Stainless steel has strong support and excellent twist control and tracking. Nickel-titanium alloy is durable. When used as a core wire, the guide wire has excellent pushing force and twist control. It can also be connected in a proximal stainless steel + distal nickel-titanium way, which can provide support while maintaining good pushing force at the distal end. There are generally two forms of guide wire head design. One is the core to tip design, in which the steel wire core is directly connected to the outer spring. This design has good controllability and tactile feedback performance, and has good tip hardness. It is suitable for lesions with large resistance to passing; the other is the shape ribbon design, in which the built-in steel core wire is not directly connected to the distal end of the outer spring, but is connected by a safety wire. This can greatly improve its shaping durability, but its passability is relatively poor. Utility Model Content

[0005] The main purpose of the utility model is to provide a guide wire, which can effectively solve the problems in the background technology.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A guide wire comprises a coil body, comprising a first coil and a second coil, wherein a joint is connected between the first coil and the second coil; a front end combination body is arranged on one side of the coil body; a core wire body is arranged on the other side of the coil body, wherein the core wire body comprises a main body and a tapered reducing end extending from the main body toward the coil body, wherein the diameter of the reducing end gradually decreases from an end close to the main body to an end away from the main body.

[0008] Preferably, the outer layer of the core filament is coated with a polytetrafluoroethylene coating.

[0009] Preferably, the core wire body is made of stainless steel.

[0010] Preferably, a core shaft is provided inside the first coil and the second coil, and the core shaft and the core wire body are integrally connected.

[0011] Preferably, the first coil is longer than the second coil.

[0012] Preferably, the end of the front end coupling body forms a hemispherical surface.

[0013] Preferably, the first coil is made of stainless steel.

[0014] Preferably, the second coil is made of copper, and an end of the second coil is fixedly connected to the front end combination body.

[0015] Preferably, the outer diameter of the main body is in the range of 0.014 inch-0.018 inch.

[0016] Preferably, the first coil is an inductor coil, and the second coil is a developing coil.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] In the utility model, a longer reducing end is provided so that the supporting transition of the guide wire is very smooth, and the setting of an integrated core wire body makes the guide wire have better controllability and tactile feedback performance, and has better tip hardness. By gradually reducing the diameter of the reducing end from one end close to the main body to the end away from the main body, the characteristics of strong support and excellent pushing force of the guide wire are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic diagram of the overall structure of a guide wire.

[0020] In the figure: 1, coil body; 101, first coil; 102, second coil; 2, front end assembly; 3, core wire body; 301, main body; 302, reducing end; 4, polytetrafluoroethylene coating; 5, joint. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] Referring to the accompanying drawings 1, a guide wire includes a coil body 1, including a first coil 101 and a second coil 102, wherein a connector 5 is connected between the first coil 101 and the second coil 102; a front end combination body 2, disposed on one side of the coil body 1; a core wire body 3, disposed on the other side of the coil body 1, the core wire body 3 includes a main body 301 and a tapered reducing end 302 extending from the main body 301 toward the coil body 1, wherein the diameter of the reducing end 302 gradually decreases from an end close to the main body 301 to an end away from the main body 301.

[0023] Specifically, the outer layer of the core wire body 3 is coated with a polytetrafluoroethylene 4 coating, which is also called a PTFE coating. The PTFE coating has excellent non-stickiness and can prevent impurities, oil stains and other substances from adhering to the surface of the guide wire, thereby reducing friction and resistance and improving the fluidity and wear resistance of the guide wire. The guide wire may be subjected to a high temperature environment in some special applications, and the PTFE coating can maintain its stability and performance under high temperature conditions and will not deform or fall off due to high temperature. The PTFE coating has good corrosion resistance in corrosive environments such as strong acids and strong alkalis, protects the guide wire from chemical erosion, and extends the service life of the guide wire. The PTFE coating can make the surface of the guide wire smoother, reduce friction resistance, and improve the conduction efficiency and operating performance of the guide wire.

[0024] In this embodiment, the core wire body 3 is made of stainless steel. Stainless steel has good corrosion resistance and can be used for a long time in a humid environment without being easily rusted or corroded. Stainless steel has high strength, good mechanical properties and tensile strength, can withstand certain tension and pressure, and is not easy to deform or break.

[0025] Furthermore, a core shaft is provided inside the first coil 101 and the second coil 102, and the core shaft and the core wire body 3 are connected in one piece, so there is no interruption in the transmission of force during operation, and the tactile feedback is better than that of the combined core wire structure.

[0026] Furthermore, the first coil 101 is longer than the second coil 102 .

[0027] Specifically, the end of the front end combination 2 forms a hemispherical surface, and the shape and design of the front end combination 2 can be used to guide the guide wire inside the body. For example, during interventional surgery or diagnosis, it can help doctors or operators correctly guide the guide wire to the target position for treatment or to obtain necessary image information; the front end combination 2 of the guide wire is usually designed to have a rounded and smooth surface to reduce damage and trauma to tissues or blood vessels. It can better pass through blood vessels or other channels and reduce the risk of discomfort or complications that may be caused during the operation; according to specific application requirements, the front end combination 2 may have special markings or materials to provide visibility. In this embodiment, the front end combination 2 of the guide wire carries a radioactive marker for visual positioning under X-ray or other imaging techniques.

[0028] Furthermore, the first coil 101 is made of stainless steel.

[0029] Specifically, the second coil 102 is made of copper, and an end of the second coil 102 is fixedly connected to the front end combination body 2 .

[0030] Furthermore, the outer diameter of the main body 301 ranges from 0.014 inches to 0.018 inches. Generally, the overall design of the guidewire will meet the same size specifications, such as the outer diameters of the core wire segment and the coil segment coated with PTFE coating are 0.014 inches / 0.016 inches / 0.018 inches, etc. The design point of the present patent content is that the size design of the coil segment at the distal end of the guidewire is one level smaller than the size design of the PTFE core wire segment, that is, the PTFE segment adopts a size of 0.018 / 0.016 / 0.014 / 0.012i inches, and the coil segment adopts a size of 0.016 / 0.014 / 0.012 / 0.010 inches accordingly. The advantage of such a design is that the PTFE coated segment adopts a coarser diameter, which can provide better support and rigidity to the guidewire as a whole, while the distal end adopts a smaller size of coil and core wire combination, which can achieve a smaller guidewire tip hardness. The small diameter facilitates the guidewire to pass through tortuous blood vessels, and the low tip hardness reduces the probability of vascular perforation.

[0031] Specifically, the first coil 101 is an inductor coil, and the second coil 102 is a developing coil. The developing coil funnel coil is used for coils in medical imaging equipment such as X-ray or CT scanners to generate a magnetic field to assist in developing and imaging. The inductor coil induction coil is used in applications such as wireless charging, wireless communication, and wireless sensors. The inductor coil transmits energy, realizes data transmission, or detects a target object through a changing magnetic field.

[0032] In the utility model, during use, the longer reducing end 302 is provided, so that the support transition of the guide wire is very smooth, and the one-piece core wire body 3 is provided, so that the guide wire has better controllability and tactile feedback performance, and has better tip hardness, and the diameter of the reducing end 302 is gradually reduced from the end close to the main body 301 to the end away from the main body 301, so as to achieve the characteristics of strong support and excellent pushing force of the guide wire.

[0033] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A guide wire, characterized in that: include: A coil body (1) comprises a first coil (101) and a second coil (102), wherein a joint (5) is connected between the first coil (101) and the second coil (102); A front end combination body (2) is arranged on one side of the coil body (1); The core wire body (3) is arranged on the other side of the coil body (1), and the core wire body (3) comprises a main body (301) and a tapered reducing end (302) extending from the main body (301) toward the coil body (1), wherein the diameter of the reducing end (302) gradually decreases from an end close to the main body (301) to an end away from the main body (301).

2. A guide wire according to claim 1, characterized in that: The outer layer of the core filament (3) is coated with a polytetrafluoroethylene (4) coating.

3. A guide wire according to claim 2, characterized in that: The core wire body (3) is made of stainless steel throughout.

4. A guide wire according to claim 3, characterized in that: A core shaft is provided inside the first coil (101) and the second coil (102), and the core shaft and the core wire body (3) are connected in one piece.

5. A guide wire according to claim 4, characterized in that: The first coil (101) is longer than the second coil (102).

6. A guide wire according to claim 5, characterized in that: The end of the front end combination body (2) forms a hemispherical surface.

7. A guide wire according to claim 6, characterized in that: The first coil (101) is made of stainless steel.

8. A guide wire according to claim 7, characterized in that: The material of the second coil (102) is copper, and the end of the second coil (102) is fixedly connected to the front end combination body (2).

9. A guide wire according to claim 8, characterized in that: The outer diameter of the main body (301) ranges from 0.014 inches to 0.018 inches.

10. A guide wire according to claim 9, characterized in that: The first coil (101) is an inductor coil, and the second coil (102) is a developing coil.

Images