Guide Wire Distal End Flat Portion Torsion Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing guide wires face challenges in shaping the distal end portion without causing torsion between the joint part and the distal end side, leading to a three-dimensional shape.
Innovation Solution
A guide wire configuration featuring a first core shaft made of superelastic material and a second core shaft made of a material more susceptible to plastic deformation, joined at a joint part with a flat portion on the distal end side of the second core shaft, which helps in easy shaping and prevents torsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a second core shaft made of material more susceptible to plastic deformation is joined to the distal end side of the first core shaft, then the distal end portion can be easily shaped, but torsion is caused between the joint part and the distal end side during shaping
Solution Approach 1:
The patent applies local quality by creating a flat portion at the distal end of the second core shaft with different dimensional characteristics (longer in the first direction than the second direction) from the rest of the shaft. This localized geometric modification allows the distal end to curve perpendicular to the adjacent direction between core shafts, conforming to the curvable direction at the joint part and preventing torsion during shaping while maintaining ease of shaping.
2Adaptability or versatility
If the distal end portion is shaped freely in any direction, then shaping flexibility is improved, but the guide wire develops a three-dimensional shape due to torsion
Solution Approach 1:
The flat portion with its specific dimensional asymmetry (longer in first direction than second direction) creates a localized region that guides curvature direction. This allows the distal end to be shaped while controlling the curvature to occur perpendicular to the adjacent direction between core shafts, preventing unwanted three-dimensional deformation and maintaining shape control.
Solution Approach 2:
The patent introduces asymmetry through the flat portion's dimensional characteristics where the length in the first direction exceeds the length in the second direction. This asymmetric geometry constrains the curving behavior to a specific plane perpendicular to the adjacent direction, preventing torsion and three-dimensional shaping while preserving flexibility within that constrained plane.
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 configuration allows for easy shaping of the distal end portion while preventing torsion and breakage, thereby maintaining the guide wire's integrity and functionality.
Implementation Method 1
a first core shaft (10) made of a superelastic material
Implementation Method 2
a second core shaft (30) made of a material more susceptible to plastic deformation than of the first core shaft (10)
Data Source
AI summary
A guide wire including a first core shaft made of a superelastic material, and a second core shaft made of a material more susceptible to plastic deformation than of the first core shaft and joined to a distal end side of the first core shaft on a proximal end side. On a joint part between the first core shaft and the second core shaft, the first core shaft and the second core shaft are adjacent to each other in a first direction. A flat portion where a length in the first direction in a transverse section is longer than a length in a second direction orthogonal to the first direction is formed on a distal end portion of the second core shaft.