Multi-Thread Coil Guide Wire Joint for Dissimilar Metals

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Solution Overview

Problem

Existing connection structures for metal bodies, particularly in medical devices like guide wires, face challenges in flexibility and compatibility when using dissimilar metals, leading to difficulties in bending and direct connection.

Innovation Solution

A multi-thread coil connection structure formed by winding element wires of different metals, such as stainless steel and nickel-titanium alloys, is used to improve flexibility and ensure proper connection between dissimilar metal bodies, with specific winding patterns and welding configurations to prevent distortion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a coiled spring is used to connect two metal bodies, then the connected portion becomes flexible, but the repulsive force of the coiled spring makes it difficult to bend

Engineering Contradiction:

Improveflexibility of connected portionVSAvoidrepulsive force of coiled spring

Core Design Contradiction:

Ease of operationVSForce

Solution Approach 1:

The coiled spring is segmented into multiple threads (first element wires and second element wires) that are adjacently wound. This segmentation allows each thread to contribute to flexibility while distributing the repulsive force across multiple elements, reducing the overall resistance to bending.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The connection structure uses composite construction with multiple threads adjacently wound together. This composite structure combines the flexibility benefits of coiled springs with reduced repulsive force through the distributed architecture of multiple adjacent threads working together.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If dissimilar metals are used for the first and second metal bodies, then design flexibility increases, but direct connection becomes difficult

Engineering Contradiction:

Improvecompatibility with dissimilar metalsVSAvoiddifficulty of direct connection

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The multi-thread coil structure acts as an intermediary connection element between dissimilar metals. The adjacently wound first and second element wires provide intermediate connection points that facilitate joining dissimilar metals through the multi-thread coil, avoiding direct contact between incompatible metal surfaces.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The connection structure employs composite material construction with first element wires and second element wires made of different metals adjacently wound together. This composite approach allows dissimilar metals to be connected through their respective element wires within the multi-thread coil, solving the compatibility issue while maintaining manufacturing feasibility.

Inventive Principle:

Principle #40Composite materials

3Ease of operation

If element wires are adjacently wound one by one, then flexibility is improved, but distortion of the multi-thread coil may occur

Engineering Contradiction:

Improveflexibility of connected portionVSAvoiddistortion of multi-thread coil

Core Design Contradiction:

Ease of operationVSShape

Solution Approach 1:

The first element wires are connected to the first metal body with specific local connection characteristics, while the second element wires are connected to the second metal body with different local connection characteristics. This localized differentiation allows each wire type to be optimized for its specific connection point, improving flexibility while maintaining overall shape stability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The multi-thread coil is segmented into first element wires connected to the first metal body and second element wires connected to the second metal body. This segmentation allows independent optimization of each wire group's connection characteristics, enabling flexibility improvement while controlling distortion through balanced segment distribution.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11654265B2Connection structure and guide wire having the connection structure

Publication Date: 2023.05.23 ASAHI INTECC CO LTD

AI summary

A connection structure includes a multi-thread coil formed by winding first metal element wires formed of a first metal and second metal element wires formed of a second metal arranged between a first metal body including the first metal and a second metal body including the second metal. The first metal body is connected to the first metal element wires of the multi-thread coil, and the second metal body is connected to the second metal element wires of the multi-thread coil. The connection structure imparts improved flexibility to the connection between the first and second metal bodies, and an appropriate connection can be provided even when the first and second metal bodies are made of dissimilar metals.