Pre-Stretched Multicore Cable for Straight Terminal Wire Ends
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Solution Overview
Problem
The increasing number of core wires in catheter cables for medical equipment has led to a bending tendency in ultra-thin conductor wires, complicating terminal processing and reducing workability due to irregular bending at the cable ends.
Innovation Solution
The multicore cable design involves twisting insulated electric wires with a metal conductor and insulating layer, where each wire is plastically stretched in the longitudinal direction at an elongation rate of 0.5% to 10.0%, reducing bending tendency and improving terminal processing workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If super fine conductor wires with diameter less than 0.1 mm are used to reduce cable outer diameter, then the cable outer diameter is reduced, but the core wires develop bending tendency and bend irregularly at cable ends
Solution Approach 1:
The patent applies preliminary action by pre-stretching the insulated electric wires during manufacturing to counteract future bending. The wires are stretched in the longitudinal direction at an elongation rate of 0.5% to 10.0% before being twisted into the cable, which creates internal tensile stress that prevents bending tendency during cable use and terminal processing.
Solution Approach 2:
The patent changes the physical parameter of the wire by applying plastic deformation through controlled stretching. This parameter change modifies the internal stress state of the wire, creating residual tensile stress that counteracts the compressive stresses causing bending, thereby maintaining wire straightness while using ultra-thin conductors.
2Volume of moving object
If super fine conductor wires are used to reduce cable outer diameter, then the cable outer diameter is reduced, but the workability of terminal processing is remarkably lowered
Solution Approach 1:
The patent applies preliminary action by pre-stretching the insulated electric wires during manufacturing to counteract future bending. The wires are stretched in the longitudinal direction at an elongation rate of 0.5% to 10.0% before being twisted into the cable, which creates internal tensile stress that prevents bending tendency during cable use and terminal processing.
Solution Approach 2:
The patent changes the physical parameter of the wire by applying plastic deformation through controlled stretching. This parameter change modifies the internal stress state of the wire, creating residual tensile stress that counteracts the compressive stresses causing bending, thereby maintaining wire straightness while using ultra-thin conductors.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively minimizes the bending tendency of insulated electric wires, enhancing the workability of terminal processing in catheter cables by uniformly distributing tensile stress along the conductor wires.
Implementation Method 1
each of the plurality of insulated electric wires is plastically stretched in a longitudinal direction at an elongation rate of 0.5% or more and 10.0% or less
Data Source
AI summary
A multicore cable is provided with a plurality of insulated electric wires, each including a metal conductor wire and an insulating layer covering the metal conductor wire. The plurality of insulated electric wires are twisted together, and each of the plurality of insulated electric wires is plastically stretched in a longitudinal direction at an elongation rate of 0.5% or more and 10.0% or less. A multicore cable assembly is provided with the multicore cable, and a terminal member to which the plurality of insulated electric wires are connected at an end of the multicore cable.