ECG Cable Semi-Conductive Wall Reduces Triboelectric Noise
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Solution Overview
Problem
Existing ECG cables face challenges in minimizing triboelectric noise due to movement-induced rubbing of loosely bound leads, which can cause interference, despite the shielding that helps bleed away such charges, as a tight polymer wrap would block these charges and worsen noise issues.
Innovation Solution
The ECG cable design incorporates a semi-conductive wall interposed between insulated conductors and the conductive shield, using a low-noise coating and semi-conductive PTFE tape to tightly bind the leads, reducing rubbing and triboelectric noise while allowing charge bleeding and maintaining cable flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If leads are tightly bound together by a polymer wrap, then rubbing and movement are reduced, but triboelectric charges are blocked from reaching the shield and cannot be bled away
Solution Approach 1:
A semi-conductive layer is introduced as an intermediary between the polymer wrap and the shield. This layer has intermediate conductivity that allows it to accept triboelectric charges from the insulated conductors and gradually dissipate them to the shield, preventing charge accumulation while maintaining the tight binding structure.
2Reliability
If leads are loosely bound, then triboelectric charges can reach the shield and be bled away, but rubbing between leads increases and generates more triboelectric noise
Solution Approach 1:
The semi-conductive layer acts as a mediator that enables charge dissipation without requiring loose binding. It provides a controlled path for charge flow while the polymer wrap maintains tight binding to minimize rubbing between leads.
Solution Approach 2:
The electrical conductivity parameter of the binding structure is changed by introducing the semi-conductive layer. This creates a gradient in conductivity from the insulated conductors through the semi-conductive layer to the shield, enabling charge dissipation while maintaining mechanical stability.
3Stability of the object's composition
If a tight polymer wrap is used to bind leads, then structural stability and reduced rubbing are achieved, but the wrap damages the low noise coating and conductor insulation
Solution Approach 1:
The semi-conductive layer serves as a protective intermediary between the polymer wrap and the low noise coating. It acts as a buffer that reduces direct mechanical contact and friction between the wrap and the delicate coating, preventing damage while maintaining structural stability.
4Object-generated harmful factors
If leads are tightly bound to reduce movement, then triboelectric noise from rubbing is reduced, but flexibility of the cable is compromised
Solution Approach 1:
The semi-conductive layer is implemented as a thin film or layer that provides the necessary electrical functionality while being flexible enough to allow cable movement. This thin film structure minimizes mechanical constraint on the cable while maintaining charge dissipation capability.
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 configuration effectively reduces triboelectric noise and prevents damage to the low-noise coating and insulation, enhancing signal quality by minimizing induced electrical interference from patient movement.
Implementation Method 1
minimize the buildup of triboelectric charge caused by the rubbing of the loosely bound leads
Implementation Method 2
the shield allows the triboelectric charge caused by the insulated wires rubbing together to be bled away
Implementation Method 3
each of the plurality of insulated conductors includes a low noise coating and the insulated conductors are tightly bound together by a semi-conductive wall interposed between the insulated conductors and the shield, thereby reducing rubbing, which can produce triboelectric effects
Data Source
AI summary
An electrocardiography (ECG) electrical cable, that includes a plurality of insulated conductors, a conductive shield surrounding the plurality of insulated conductors and an insulating jacket surrounding the plurality of insulated conductors and the conductive shield. Also, each of the plurality of insulated conductors includes a low noise coating and the insulated conductors are tightly bound together by a semi-conductive wall interposed between the insulated conductors and the shield, thereby reducing rubbing, which can produce triboelectric effects.