Interconnect Cable Conductive Coating Reduces Cross-Talk
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Solution Overview
Problem
In medical devices with base/remote unit systems, electrical cross-talk between conductors in cables is a challenge, particularly in high-information transfer scenarios, where increasing the thickness of insulating material and adding a braided shield reduces the number of conductors that can fit within a given cable diameter, and thinner conductors are more fragile, limiting cable lifespan.
Innovation Solution
A cable assembly with insulated wires featuring a conductive coating on the outside surface of the insulating layer, which decreases mutual capacitance and electromagnetic interference, allowing for a higher number of wires within a given diameter, and includes a braided shield and non-conductive sheath to manage cross-talk and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thickness of insulating material is increased to reduce cross-talk, then cross-talk is reduced, but the number of conductors that can fit within a given cable diameter decreases
Solution Approach 1:
The patent applies nesting by placing a conductive coating layer inside the insulating material layer, effectively nesting one functional layer within another. This allows the conductive coating to provide cross-talk reduction functionality without replacing or significantly increasing the insulating material thickness, thereby maintaining both cross-talk protection and conductor density.
Solution Approach 2:
The patent uses composite materials by combining the insulating material with a conductive coating layer. This composite structure integrates both insulation and electromagnetic shielding functions into a single cable construction, allowing cross-talk reduction without proportionally increasing the overall cable diameter or reducing the number of conductors.
2Object-affected harmful factors
If a braided shield wire is added to improve cross-talk characteristics, then cross-talk is reduced, but the number of conductors that can fit within a given cable diameter decreases
Solution Approach 1:
The patent extracts the shielding function from the traditional braided shield wire and implements it as a conductive coating applied directly to individual conductors. This eliminates the need for a separate braided shield layer, freeing up space within the cable for additional conductors while maintaining cross-talk protection.
Solution Approach 2:
The patent applies local quality by providing conductive coating only on the surface of individual insulating layers where it is most needed for cross-talk reduction, rather than using a comprehensive braided shield that would occupy significant cable volume. This localized approach optimizes the balance between cross-talk protection and conductor capacity.
3Quantity of substance
If thinner conductors are used to increase the number of conductors in a cable, then the number of conductors increases, but the conductors become more fragile and cable useful life is limited
Solution Approach 1:
The patent uses composite materials by combining thinner conductors with a conductive coating layer. This composite construction allows the use of thinner, more numerous conductors while the conductive coating provides additional structural reinforcement and protection, thereby maintaining cable reliability despite the reduced individual conductor thickness.
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
The conductive coating reduces cross-talk and electromagnetic interference, enabling more wires to be packed within a cable of a given diameter, improving signal integrity and cable flexibility while maintaining durability by allowing thinner conductors.
Implementation Method 1
The conductive coating generally decreases the mutual capacitance between adjacent wires
Implementation Method 2
a conductive coating formed on an outside surface of the insulating layer... decreases mutual capacitance and electromagnetic interference
Data Source
AI summary
A cable assembly includes a plurality of wires. Each wire has a first end, intermediate section, and a second end. The intermediate sections of the respective wires are detached from each other. A conductive shield surrounds the respective intermediate sections of the plurality of wires. Each wire includes a conductor, an insulating layer that surrounds the conductor, and a conductive coating formed on an outside surface of the insulating layer.