Guide Wire Coil Connection Alignment and Brazing
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Solution Overview
Problem
Existing guide wires face challenges in achieving both workability in the connection of two coils and ease of application of brazing metal into the connecting portion, due to issues with alignment and bonding strength.
Innovation Solution
A guide wire design featuring a core shaft with a coil body composed of a distal-end coil and a proximal-end coil, where the coils are connected with alternately disposed turns, providing gaps between turns to facilitate alignment and brazing metal application, ensuring strong bonding between the coils and the core shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a large pitch is set between two coils in a connecting portion to provide clearance between coil turns, then ease of application of brazing metal is improved, but alignment of central axes of the coils deteriorates
Solution Approach 1:
The patent applies different pitch values to different sections of the coil body. Specifically, the first pitch is set larger than the second pitch in the connecting portion, creating local variation in pitch that simultaneously provides clearance for brazing metal application while maintaining proper alignment of the coil central axes through the alternating turn configuration
2Manufacturing precision
If coil turns in a connecting portion are tightly connected without clearance, then alignment of central axes of coils is improved, but ease of application of brazing metal deteriorates
Solution Approach 1:
The patent creates local quality variation by setting the first pitch larger than the second pitch specifically in the connecting portion where brazing is needed. This localized pitch increase provides the necessary clearance for brazing metal application while other sections maintain tighter winding for proper alignment and structural integrity
Data Source
AI summary
[Problem to be Solved] To obtain, in a guide wire including a coil body composed of two connected coils, both workability in the connection of two coils and ease of application of brazing metal into the connecting portion of the coils. [Solution] A first wire 40a of a proximal-end coil 40 is held by or clamped between a third turn 30a and a second turn 30b of a distal-end coil 30 from both sides. A second turn 40b adjacent to the first turn 40a of the proximal-end coil 40 is in contact with a first turn 30c of the distal-end coil 30 from the proximal-end side of the second turn 40b. Moreover, a gap G is provided between the second turn 40b and the second turn 30b of the distal-end coil 30, the second turn 30b being adjacent to the distal-end side of the second turn 40b. With this configuration, even before brazing, the central axes of the two coils can be easily kept aligned with each other and brazing metal or the like can be easily applied into a connecting portion.