Guiding wire

Abstract

The invention relates to a guiding wire comprising a guiding wire core (11) which consists of an inner core (18) and an outer layer (19), and an spring jacket; the inner core (18) is composed of alloy materials with great elasticity and the outer layer (19) coating the inner core (18) is composed of metal or alloy with high rigidity or a mixed material of the metal and alloy, and the inner core (18) is coaxial with the outer layer (19) thereof; the spring jacket is internally inserted with part of the guiding wire core (11). The interventional therapy guiding wire of the invention not only uses the high elasticity of the alloy material with great elasticity to entitle the guiding wire head end with softness and restoration properties, but also uses metal with high rigidity and alloy material with higher strength and rigidity to ensure the pushing property and relevant spiral-pressing property of the guiding wire, thus leading to good controllability of the guiding wire.

Description

technical field [0001] The invention relates to a medical guide wire for minimally invasive treatment, which is used for guiding and positioning various interventional medical catheters and implanted instruments into human organs, and belongs to the technical field of medical instruments. Background technique [0002] At present, the main method for treating coronary heart disease is percutaneous coronary intervention (PCI). The guide wire used in coronary intervention requires a certain degree of controllability, flexibility and recovery when entering tortuous blood vessels, propulsion of distal movement due to proximal operation, and corresponding twist control, etc. [0003] According to the core material selection, traditional coronary guidewires can be divided into one core core type and two core core type. One core type, for example, the entire core of the guide wire is made of 304 stainless steel. This type of guide wire has good torsion control, but when the operabi...

AI Technical Summary

Problems solved by technology

[0005] At present, there are two connection methods that can realize the connection of two core cores: using tubular connecting parts at the joint and direct welding. Combined with the problem of low strength, the transmission of torque control is not good, and the required torque control cannot be guaranteed, and the tubular connecting parts are expensive, and the processing and production are cumbersome

At present, the jointing of stainless steel and superelastic alloy filaments is a worldwide problem. Although some manufacturers have directly welded the two, there is still the problem that the joint strength of the joint is not high. In clinical use, when this guide wire enters human tissue It is easy to be discounted or broken, which affects the normal clinical operation and easily damages human tissue

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