Multicore Cable Layer Layout for Twinax Flex Resistance
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Solution Overview
Problem
Multicore cables used in medical devices face challenges with flex resistance, as they are prone to breaking when repeatedly bent, particularly the Twinax cables within the cable structure.
Innovation Solution
The multicore cable design incorporates a twisted wire portion with a first twisted wire layer and a second twisted wire layer, where the Twinax cables are positioned in the second layer closer to the center, reducing expansion and contraction, and the coaxial cables are in the first layer to enhance flex resistance, and optionally includes an insulated cable to increase versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If Twinax cables are disposed in the first twisted wire layer closest to the shield layer, then the cable structure is simplified, but the flex resistance deteriorates and the cable is prone to breaking when bent repeatedly
Solution Approach 1:
The twisted wire portion is divided into two distinct twisted wire layers: a first twisted wire layer closest to the shield layer and a second twisted wire layer on the center side. This segmentation allows different cable types to be positioned in different layers, optimizing both structural organization and flex resistance.
Solution Approach 2:
Different regions of the cable cross-section are assigned different functions: the first twisted wire layer (outer region) is designated for coaxial cables that can tolerate greater expansion and contraction, while the second twisted wire layer (inner region) is designated for Twinax cables that require protection from excessive movement to improve flex resistance.
2Reliability
If Twinax cables are disposed in the second twisted wire layer closer to the center, then the flex resistance is improved, but the cable structure becomes more complex
Solution Approach 1:
The twisted wire portion is divided into two distinct twisted wire layers: a first twisted wire layer closest to the shield layer and a second twisted wire layer on the center side. This segmentation allows different cable types to be positioned in different layers, optimizing both structural organization and flex resistance.
Solution Approach 2:
The cable structure is organized in a radial dimension with two concentric twisted wire layers. This dimensional arrangement allows systematic placement of different cable types at different radial positions, improving flex resistance while maintaining structured complexity.
3Reliability
If coaxial cables are disposed in the first twisted wire layer and Twinax cables in the second twisted wire layer, then the flex resistance is significantly improved, but the manufacturing process becomes more complex
Solution Approach 1:
Coaxial cables and Twinax cables are prepared and grouped in advance before assembly. The coaxial cables are pre-assembled into the first twisted wire layer configuration, and Twinax cables are pre-assembled into the second twisted wire layer configuration, simplifying the final assembly process despite the multi-layer structure.
Solution Approach 2:
The twisted wire portion is divided into two distinct twisted wire layers: a first twisted wire layer closest to the shield layer and a second twisted wire layer on the center side. This segmentation allows different cable types to be positioned in different layers, optimizing both structural organization and flex resistance.
Data Source
AI summary
A multicore cable includes a twisted wire portion including a plurality of Twinax cables and a plurality of coaxial cables, and a shield layer disposed on an outer periphery of the twisted wire portion. The twisted wire portion includes a first twisted wire layer and a second twisted wire layer in a cross section perpendicular to a longitudinal direction of the multicore cable. The first twisted wire layer is closest to the shield layer, and the second twisted wire layer is located on a center side from the first twisted wire layer and is adjacent to the first twisted wire layer. A closest Twinax cable is disposed in the second twisted wire layer. The closest Twinax cable is closest to the shield layer among the plurality of Twinax cables included in the twisted wire portion.