Guide Wire Joint Integrity via Strain Matching
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Solution Overview
Problem
Guide wires with joints between core shafts of differing materials, such as nickel-titanium alloy and stainless steel, experience detachment due to strain differences when a load is applied, affecting their reliability in various bodily systems.
Innovation Solution
A guide wire design featuring a superelastic first core shaft with a second core shaft joined at the distal end, where the breaking elongation is minimized and nanoindentation hardness is increased, preventing interface detachment by matching the strain characteristics of both materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a long shaft made of nickel-titanium alloy is joined to a ribbon made of stainless steel, then the guide wire can be shaped to improve selectivity for blood vessels, but the joint part detaches when a load is applied due to significant differences in strain amount between the two materials
Solution Approach 1:
The patent applies parameter changes by modifying the strain characteristics of the long shaft through heat treatment or cold working processes. Specifically, the nickel-titanium alloy long shaft is subjected to controlled deformation to reduce its strain amount to be closer to that of the stainless steel ribbon, thereby preventing detachment at the joint part while maintaining the curved shape for vascular selectivity
2Adaptability or versatility
If core shafts made of materials that significantly differ in strain amount are joined together, then the guide wire can combine the advantages of different materials, but the joint part experiences detachment destruction when tensile load is applied
Solution Approach 1:
The patent modifies the strain parameters of the nickel-titanium alloy core shaft through controlled deformation processes. By reducing the strain amount of the superelastic material to match更接近 the plastic material's strain characteristics, the joint part maintains structural integrity under tensile load while preserving the benefits of material combination
Solution Approach 2:
The patent creates a composite structure where the nickel-titanium alloy and stainless steel materials are joined with compatible strain characteristics. Through parameter matching, the composite guide wire achieves both the superelasticity benefits of nickel-titanium and the plastic deformability of stainless steel without joint detachment
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances the guide wire's stability by reducing elongation and maintaining the joint integrity under tensile load, ensuring reliable insertion and operation within bodily systems.
Implementation Method 1
a first core shaft (10) made of a superelastic material
Data Source
AI summary
A guide wire includes: a first core shaft made of a superelastic material, and a second core shaft made of a material more plastically deformable than the first core shaft and is joined to a distal end portion of the first core shaft. On the distal end portion to which the second core shaft is joined in the first core shaft, breaking elongation attributed to a tensile load is shorter compared to portions on a proximal end side with respect to the distal end portion.