Variable-Rigidity Coil Structure for Catheter Torque Transmission
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Solution Overview
Problem
Existing rotation transmission structures in medical devices lack the ability to adjust rigidity while maintaining effective rotation transmission properties.
Innovation Solution
A rotation transmission structure with a reinforcing body that connects adjacent wires, featuring varying connection portion densities, pitches, and material moduli to adjust rigidity and improve rotation transmission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reinforcing body is added to improve rotation transmission properties, then rotation transmission properties are improved, but device complexity increases
Solution Approach 1:
The reinforcing body is constructed from multiple connection portions with different Young's moduli (first material with higher modulus, second material with lower modulus) to create a composite structure that optimizes both rotation transmission and rigidity control within a single integrated component
Solution Approach 2:
Different regions of the reinforcing body have different material properties - connection portions in the first region use material with higher Young's modulus while connection portions in the second region use material with lower Young's modulus, allowing localized optimization of mechanical properties
2Ease of manufacture
If the reinforcing body uses uniform material throughout, then manufacturing is simplified, but rigidity cannot be adjusted in different regions
Solution Approach 1:
The reinforcing body incorporates connection portions made from different materials with different Young's moduli in different regions, enabling localized adjustment of rigidity properties while maintaining functional effectiveness in rotation transmission
Solution Approach 2:
The Young's modulus parameter is varied across different connection portions by using materials with different elastic properties, allowing the rigidity of the reinforcing body to be adjusted in different regions to match specific functional requirements
Data Source
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AI summary
Provided is a technique for improving the rotation transmission performance of a rotation transmission member and enabling adjustment of the rigidity of a rotation transmission structure. A rotation transmission structure (20) is provided with: a coil body (30) formed by winding element wires (31); and a reinforcing body (40) for connecting adjacent element wires (31) of the coil body (30). The reinforced body (40) is provided such that when the element wires (31) of the coil body (30) are connected to one another, the rigidity of a predetermined region (21) in the longitudinal direction is lower than the rigidity of another region (22).