Conductive Elastomeric Yarns for Wearable Sensing
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Solution Overview
Problem
Existing stretch type fabrics and garments lack sufficient elasticity, and conventional electronic monitoring devices are bulky, uncomfortable, and limit user dexterity.
Innovation Solution
Development of stretchable conductive yarns with a conductive and elastic core covered by a non-conductive sheath, suitable for use in fabrics and garments, and integrated with a processor to detect body movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electronic monitoring devices are used, then body movements can be monitored, but the devices are bulky and uncomfortable to wear
Solution Approach 1:
The patent combines the electronic monitoring function directly into the fabric by integrating conductive elastic yarns with sensors and a processor, eliminating the need for separate bulky monitoring devices. The fabric itself becomes the monitoring device, providing both comfort and functionality.
Solution Approach 2:
The fabric serves multiple functions simultaneously: it provides mechanical support and comfort as clothing while also functioning as an electronic monitoring device that can detect body movements, gestures, and physiological signals through integrated sensors and conductive elements.
2Reliability
If conventional electronic monitoring devices are used, then body movements can be monitored, but the devices limit user dexterity
Solution Approach 1:
The monitoring system is merged into the fabric structure itself, with conductive yarns and sensors woven or knitted directly into the material. This integration eliminates external devices that restrict movement, allowing users to maintain full dexterity while being monitored.
Solution Approach 2:
The patent uses flexible conductive elastic yarns and thin film sensors that conform to the fabric structure, allowing the monitoring system to stretch and move with the user's body without restricting dexterity or requiring rigid components.
3Shape
If stretch type fabrics with elastomeric yarns are used, then form-fitting garments are produced, but the fabrics lack good elasticity and become nonfunctional over time
Solution Approach 1:
The patent uses composite elastomeric yarns combining different polymer components (such as polyurethane and polyethylene terephthalate) in specific ratios and configurations. This composite structure provides both the form-fitting capability and long-term elasticity retention, preventing sagging and cracking that occur with single-material fabrics.
Solution Approach 2:
The fabric structure incorporates dynamic elements that allow the yarns to reversibly deform and recover through many stretch cycles. The elastomeric components are designed to maintain their elastic properties over time, enabling the fabric to repeatedly return to its original shape without permanent deformation.
4Reliability
If conductive elastic yarns are used for sensing applications, then body movements can be detected, but the electrical properties change during loading-unloading cycles
Solution Approach 1:
The conductive elastic yarns use composite structures with conductive fillers (such as carbon nanotubes, graphene, or conductive polymers) embedded in an elastomeric matrix. This composite design maintains stable electrical properties during deformation cycles by ensuring continuous conductive pathways that remain intact during stretching and recovery.
Solution Approach 2:
The patent carefully controls the parameters of the conductive material, including filler concentration, particle size, and distribution within the elastomeric matrix. These parameter optimizations ensure that the electrical conductivity remains stable and predictable during loading-unloading cycles, providing reliable sensing signals.
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 yarns maintain excellent elasticity and electrical properties throughout their use, enabling the creation of comfortable, functional garments that can effectively monitor body movements and metabolic conditions.
Implementation Method 1
an elastomeric fiber which is conductive... maintain substantially unchanged electrical properties after many work cycles... the electric resistance of a yarn
Implementation Method 2
an elastomeric fiber... a loading-unloading cycle typically is carried out when the elastic conductive fiber is stretched
Data Source
AI summary
A stretchable conductive yarn (1) includes a conductive core (2) of one or more elastic fibers (4-6) and an insulating sheath (3) that covers the conductive core. One or more of the elastic core fibers may be an elastomeric material (4) and may be combined with a less elastic fiber (5, 6) to control the returning properties of the conductive elastic fibers. Also provided are fabrics, garments and various devices formed using the conductive elastic yarns and which can be used to perform various electrical sensing operations to monitor and measure various bodily functions and conditions, or performance of a wearer.