Plasma Guide Wire Insulating Resin Tube Stiffness Gap
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Solution Overview
Problem
Conventional plasma guide wires experience decreased operativity due to stiffness gaps created by differences in material hardness between insulating resin tubes, leading to bending issues at the distal end where the coil is not present.
Innovation Solution
Incorporating a third insulating resin tube that is harder than the first insulating resin tube, positioned on the inner periphery of the first tube, to reduce stiffness gaps and improve operativity by preventing bending and ensuring better insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first insulating resin tube and the second insulating resin tube are composed of the same relatively hard resin, then insulation performance is improved, but the operativity of the guide wire body where the coil is wound around decreases
Solution Approach 1:
The patent applies local quality by using different resin materials for different sections of the insulating resin tube. Specifically, the first insulating resin tube (covering the coil region) uses a softer resin to maintain guide wire flexibility and operativity, while the second insulating resin tube (proximal section) uses a harder resin to ensure adequate insulation performance. This localized material differentiation resolves the contradiction between overall insulation performance and local flexibility requirements.
2Reliability
If the second insulating resin tube is configured to be harder than the first insulating resin tube, then insulation performance is improved, but a stiffness gap is created at the portion of the first insulating resin tube where the coil is not present
Solution Approach 1:
The patent introduces a third insulating resin tube as an intermediary element disposed on the inner periphery of the first insulating resin tube. This third tube provides additional structural support and stiffness to the first tube section, compensating for the potential stiffness gap created by the softer material. The third insulating resin tube acts as a mediator that maintains structural integrity while allowing the first tube to use softer material for improved operativity.
3Ease of operation
If the first insulating resin tube is made softer to improve operativity, then guide wire flexibility is improved, but bending occurs at the portion where the coil is not present
Solution Approach 1:
The patent employs composite material structure by combining multiple insulating resin tubes with different material properties. The first insulating resin tube uses softer material for flexibility, while the third insulating resin tube (inner layer) and second insulating resin tube (outer proximal layer) use harder materials for structural support. This composite arrangement allows the guide wire to achieve both flexibility in the distal section and structural integrity overall, preventing unwanted bending while maintaining operativity.
Data Source
AI summary
Provided is a plasma guide wire including a core shaft, a coil, a tip, a coil-core shaft joining region, and first to third insulating resin tubes. The first insulating resin tube is disposed on the outer periphery of the coil, and extends proximally from the tip to beyond the coil-core shaft joining region. The second insulating resin tube is disposed on the outer periphery of the core shaft, is joined to the proximal end of the first insulating resin tube, and extends from the proximal end of the first insulating resin tube to the proximal side of the core shaft. The second insulating resin tube is harder than the first insulating resin tube. The third insulating resin tube is disposed on at least a portion of a region of the inner periphery of the first insulating resin tube, proximal to a location facing the proximal end of the coil.