Guide Wire Coil-Resin Structure for Flexible Curving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing guide wires suffer from resin layer peeling and damage when curved due to insufficient flexibility and expansion of gaps between coil body wires, leading to reduced operational effectiveness.
Innovation Solution
A guide wire design with a core shaft, coil body, and resin layer featuring sparsely wound parts with gaps and protruding portions extending toward the core shaft, maintaining resin layer thickness and flexibility by forming voids between the coil and core shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin layer is formed on the outer peripheral surface of the coil body, then the slidability and thrombus adhesion preventing property are improved, but the resin layer may be peeled or damaged when the guide wire is curved
Solution Approach 1:
The resin layer is segmented into multiple portions: a surface layer on the outer peripheral surface and protruding portions extending toward the core shaft through gaps between adjacent wires. This segmentation allows the resin layer to maintain thickness and adhere properly even when the guide wire is curved, preventing peeling and damage while preserving flexibility.
Solution Approach 2:
The resin layer extends from the outer peripheral surface toward the core shaft in the radial dimension, forming protruding portions that protrude through the gaps between adjacent wires. This three-dimensional configuration ensures the resin layer maintains sufficient thickness even when compressed during curving, preventing peeling while allowing the guide wire to bend flexibly.
2Device complexity
If the resin layer is formed between the coil body and core shaft without a gap, then the structure is compact, but the flexibility of the guide wire is insufficient
Solution Approach 1:
The resin layer is strategically positioned to protrude through gaps between adjacent wires in specific locations, while maintaining a compact overall structure. This local extension of the resin layer provides flexibility without compromising structural compactness, allowing the guide wire to bend easily while maintaining a condensed configuration.
3Ease of operation
If the resin layer thickness is reduced in expanded gaps between wires, then the guide wire can be curved more easily, but the resin layer becomes prone to peeling or damage
Solution Approach 1:
The resin layer is pre-formed with protruding portions that extend toward the core shaft through the gaps between adjacent wires before curving occurs. This preliminary configuration ensures that when the guide wire is curved and gaps expand, the resin layer already has sufficient thickness and anchoring to prevent peeling or damage, while still allowing easy curving.
Data Source
AI summary
A guide wire includes a core shaft, a coil body that is a wire wound around the core shaft, and a resin layer covering at least an outer peripheral surface of the coil body. The coil body includes a spaced part in which a gap is formed between adjacent wires, and is arranged to form a void between the coil body and the core shaft. The resin layer includes a protruding portion protruding inside the void toward the core shaft through the gap between the adjacent wires in the spaced part. The protruding portion extends toward the core shaft in a direction away from an inner peripheral surface of the coil body.