Guide wire with good flexibility and torque transferability

Abstract

According to the technical scheme, the guide wire with the good flexibility and the good torque transmission performance at the same time comprises a tip combination part, a core shaft, a torque coil and a safety guide wire core, the core shaft is divided into a core shaft body and a core shaft conical part, the diameter of the core shaft body is larger than that of the core shaft conical part, and the tip combination part is connected with the torque coil. The base end of the torque coil is jointed with the front end of the conical part of the mandrel, the safety guide wire core is connected with the mandrel and the tip combination part, the front ends of the safety guide wire core and the torque coil are both inserted into the tip combination part, and the front end of the mandrel is not inserted into the tip combination part. Compared with the prior art, the guide wire has the advantages that the mandrel is not inserted into the tip joint part, so that the front end of the guide wire shows excellent flexibility, meanwhile, the torque coil is firm enough, reliable torque transmission is provided for the guide wire, and finally the front end of the guide wire has sufficient strength, enough flexibility and excellent torque transmission.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a guide wire with good softness and torque transmission properties. Background Art

[0002] Interventional therapy is a new type of high-tech minimally invasive treatment technology, which has the characteristics of small trauma, multiple indications, definite efficacy, and fast postoperative recovery. It is an important development trend of future medicine. It is a minimally invasive treatment that introduces specific instruments into the lesion site of the human body through natural channels or tiny incisions under the guidance and monitoring of imaging equipment. Surgical guide wires are usually used in interventional therapy.

[0003] Since the blood vessels in the human body are complex and curved, the front end of the guide wire is required to have a certain degree of flexibility in order to reduce the risk of puncturing the blood vessel. At the same time, in order to allow the guide wire to move forward in any direction in a tortuous and complex blood vessel or branch vessel, the front end of the guide wire needs to rotate following the rotation of the proximal hand (base end), so the guide wire is required to have a certain degree of torque transmission.

[0004] In order to improve the torque transmission performance, the current guide wire needs to be straight, thus losing its flexibility. If a soft mandrel is used to improve flexibility, it is difficult to improve the torque transmission performance. Therefore, it is difficult to achieve both flexibility and torque transmission performance. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a guide wire having both good softness and torque transmission properties.

[0006] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A guidewire having both good softness and torque transmission properties, comprising a tip joint, a core shaft, a torque coil and a safety guidewire core, wherein the core shaft is divided into a core shaft body and a core shaft cone, and the diameter of the core shaft body is larger than the diameter of the core shaft cone, the base end of the torque coil is engaged with the front end of the core shaft cone, the safety guidewire core connects the core shaft and the tip joint, the front ends of the safety guidewire core and the torque coil are inserted into the tip joint, and the front end of the core shaft is not inserted into the tip joint.

[0008] Preferably, the length of the mandrel is set to 1500mm-4000mm, and the diameter of the mandrel body is set to 0.7mm-0.9mm.

[0009] Preferably, the torque coil is configured as a single-strand coil, and the torque coil is a coil made of gold.

[0010] Preferably, the wire cross-section of the torque coil is set to be circular.

[0011] Preferably, the method further comprises a coil body, wherein the coil body is wound on the cone portion of the core shaft.

[0012] Preferably, the coil body and the core shaft are both configured as coils made of SUS304V stainless steel, and the lengths of the coil body and the tapered portions of the core shaft are both configured to be 120 mm-150 mm.

[0013] Preferably, the wire cross-section of the coil body is a rounded rectangle.

[0014] Preferably, the short side of the rounded rectangle is set to 0.08mm-0.11mm, and the long side is set to 0.2mm-0.3mm.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The utility model connects the core shaft and the tip joint through a safety guide wire core to ensure that the coil body will not break and fall off in the blood vessel. The core shaft is not inserted into the tip joint. Therefore, the front end of the guide wire shows excellent softness, so that the guide wire can bend and move forward softly in the body without causing burden on the tissue in the body. At the same time, the torque coil is strong enough to provide reliable torque transmission for the guide wire, and finally the front end of the guide wire has sufficient strength, sufficient softness and excellent torque transmission.

[0017] 2. The utility model uses gold as the material of the torque coil, because X-rays are less likely to penetrate gold materials, which can make the X-ray image contrast higher, so that the position of the front end of the guide wire in the body can be accurately and easily grasped. At the same time, the softness and torque transmission of gold as the selected material can also meet the requirements;

[0018] 3. The utility model further improves the flexibility of the guide wire by selecting a circular torque coil as the wire cross section, and at the same time, by appropriately increasing the diameter of the wire constituting the torque coil, the torque transmission of the torque coil and the strength of the front end of the guide wire are improved;

[0019] 4. The utility model plays a lubricating role through the core shaft coating, thereby effectively reducing friction resistance and improving the operability of the guide wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The disclosure of the present invention is described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them:

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a cross-sectional view of the utility model.

[0023] Notes in the figure: 1. Tip joint; 2. Mandrel; 3. Coil body; 4. Torque coil; 5. Safety guide wire core; 6. Mandrel expansion protrusion; 7. Mandrel coating. DETAILED DESCRIPTION

[0024] It is easy to understand that according to the technical solution of the utility model, without changing the essential spirit of the utility model, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the utility model, and should not be regarded as the entirety of the utility model or as a limitation or restriction to the technical solution of the utility model.

[0025] like Figure 1 , 2 As shown, as a guide wire of the utility model having both good softness and torque transmission, it includes a tip joint 1 and a core shaft 2, the core shaft 2 is divided into a core shaft body and a core shaft cone, and the diameter of the core shaft body is larger than the diameter of the core shaft cone, a torque coil 4 is welded to the front end of the core shaft cone, and a coil body 3 is wound on the core shaft cone, the tip joint 1 and the core shaft 2 are connected by a safety guide wire core 5, the front ends of the safety guide wire core 5 and the torque coil 4 are inserted into the tip joint 1, and the front end of the core shaft 2 is not inserted into the tip joint 1;

[0026] The core shaft 2 and the tip joint 1 are connected by a safety guidewire core 5 to ensure that the coil body 3 will not break and fall off in the blood vessel. The core shaft 2 is not inserted into the tip joint 1. Therefore, the front end of the guidewire exhibits excellent softness, so that the guidewire can bend and move forward softly in the body without causing any burden to the body tissue. At the same time, the torque coil 4 is strong enough to provide reliable torque transmission for the guidewire, ultimately making the front end of the guidewire have sufficient strength, sufficient softness and excellent torque transmission.

[0027] The core shaft 2 and the coil body 3 are set to be coils made of SUS304V stainless steel, and the lengths of the coil body 3 and the core shaft taper are both set to 135 mm, the wire cross-section of the coil body 3 is a rounded rectangle, and the short side of the rounded rectangle is set to 0.095 mm, and the long side is 0.25 mm, the length of the core shaft 2 is set to 2750 mm, and the diameter of the core shaft body is set to 0.813 mm, and a core shaft expansion protrusion 6 is provided at the base end of the core shaft taper, and the core shaft expansion protrusion 6 is welded to the base end of the coil body 3;

[0028] The torque transmission of the guide wire is ensured by the coil body 3 and the core shaft 2 made of SUS304V stainless steel, the strength of the guide wire is ensured by the core shaft main body with a diameter of 0.813mm, and the coil body 3 is the same length as the cone portion of the core shaft to ensure that the coil body 3 covers the entire cone portion of the core shaft. The wire with a rounded rectangular cross-section can further improve the torque transmission of the coil body, and the coil body 3 made of thinner wire can ensure the softness of the coil body.

[0029] The torque coil 4 and the coil body 3 are both configured as single-strand coils, and the winding direction of the torque coil 4 is the same as the winding direction of the coil body 3. The torque coil 4 is a coil made of gold, and the wire cross-section of the torque coil 4 is configured as a circle.

[0030] Gold is selected as the material of the torque coil 4 because X-rays are less likely to penetrate gold, which can make the X-ray image contrast higher, so that the position of the front end of the guide wire in the body can be accurately and easily grasped. In addition, the softness and torque transmission properties of gold as the selected material can also meet the requirements. The choice of a circular cross-section further improves the softness of the guide wire. At the same time, by appropriately increasing the diameter of the wire constituting the torque coil 4, the torque transmission properties of the torque coil 4 and the strength of the front end of the guide wire are improved.

[0031] like Figure 1 As shown, a layer of core shaft coating 7 is provided on the surface of the coil body 3 and the core shaft main body. The core shaft coating 7 is a coating made of PTFE material. The core shaft coating 7 plays a lubricating role, thereby effectively reducing friction resistance and improving the operability of the guide wire. At the same time, a layer of core shaft coating 7 ensures that the thickness is minimized after the core shaft coating 7 covers the core shaft main body and the coil body 3, thereby ensuring the softness of the guide wire.

[0032] The technical scope of the present invention is not limited to the contents described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical concept of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A guidewire having both good flexibility and torque transmission, characterized in that: The invention comprises a tip joint (1), a core shaft (2), a torque coil (4) and a safety guide wire core (5), wherein the core shaft (2) is divided into a core shaft body and a core shaft cone, and the diameter of the core shaft body is larger than the diameter of the core shaft cone, the base end of the torque coil (4) is engaged with the front end of the core shaft cone, the safety guide wire core (5) connects the core shaft (2) and the tip joint (1), the front ends of the safety guide wire core (5) and the torque coil (4) are both inserted into the tip joint (1), and the front end of the core shaft (2) is not inserted into the tip joint (1).

2. A guidewire having both good flexibility and torque transmission according to claim 1, characterized in that: The length of the mandrel (2) is set to 1500 mm-4000 mm, and the diameter of the mandrel body is set to 0.7 mm-0.9 mm.

3. A guidewire having both good flexibility and torque transmission according to claim 2, characterized in that: The torque coil (4) is configured as a single-strand coil, and the torque coil (4) is a coil made of gold.

4. A guidewire having both good flexibility and torque transmission according to claim 3, characterized in that: The wire cross section of the torque coil (4) is arranged to be circular.

5. The guidewire having good flexibility and torque transmission according to claim 1, characterized in that: It also comprises a coil body (3), wherein the coil body (3) is wound on the cone portion of the core shaft.

6. A guidewire having both good flexibility and torque transmission according to claim 5, characterized in that: The coil body (3) and the core shaft (2) are both configured as coils made of SUS304V stainless steel, and the lengths of the coil body (3) and the tapered portions of the core shaft are both configured to be 120 mm to 150 mm.

7. A guidewire having both good flexibility and torque transmission according to claim 6, characterized in that: The wire cross section of the coil body (3) is a rounded rectangle.

8. A guidewire having both good flexibility and torque transmission according to claim 7, characterized in that: The short side of the rounded rectangle is set to 0.08mm-0.11mm, and the long side is set to 0.2mm-0.3mm.

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