Triboelectric Sweat Sensor Powering for Continuous Wearable Monitoring

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Solution Overview

Problem

Existing wearable bioelectronic devices, particularly sweat sensors, face challenges with high power demands, limited power storage, fragility, and low power density, making continuous monitoring difficult and inefficient, and existing battery-powered solutions add weight and bulk while requiring frequent charging.

Innovation Solution

A self-powered wearable system utilizing a kinematic power system with a stator and slider coated with triboelectric materials, integrated with a freestanding triboelectric nanogenerator (FTENG) and low-power wireless sensor circuitry, supported by flexible printed circuit board technology, which generates power through human motion and biofluids, enabling continuous monitoring without external energy sources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If existing sweat sensors use large power storage batteries to meet high power demands, then continuous monitoring capability is improved, but device weight and bulk increase

Engineering Contradiction:

Improvecontinuous monitoring capabilityVSAvoiddevice weight

Core Design Contradiction:

Duration of action of moving objectVSWeight of moving object

Solution Approach 1:

The sweat sensor system generates its own power through triboelectric nanogenerators that convert mechanical energy from body movement and sweat flow into electrical energy, eliminating the need for external batteries and enabling continuous monitoring without adding device weight

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces the mechanical battery system with a triboelectric nanogenerator system that uses mechanical energy from natural body movements and sweat flow to generate electricity, thereby eliminating heavy power storage components while maintaining continuous operation capability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Duration of action of moving object

If existing sweat sensors increase power storage capacity to enable continuous monitoring, then monitoring duration is improved, but device complexity increases

Engineering Contradiction:

Improvemonitoring durationVSAvoiddevice complexity

Core Design Contradiction:

Duration of action of moving objectVSDevice complexity

Solution Approach 1:

The system uses self-powered triboelectric nanogenerators that automatically convert mechanical energy from body movement and sweat into electrical energy, eliminating complex battery management systems and enabling extended monitoring through a simple, autonomous power generation mechanism

Inventive Principle:

Principle #25Self-service

3Volume of moving object

If existing sweat sensors use high power density sources to reduce device size, then wearable suitability is improved, but power continuity and longevity decrease

Engineering Contradiction:

Improvedevice sizeVSAvoidpower continuity

Core Design Contradiction:

Volume of moving objectVSDuration of action of stationary object

Solution Approach 1:

The triboelectric nanogenerator system continuously converts mechanical energy from ongoing body movements and sweat flow into electrical energy, providing sustained power output that matches the continuous operation needs of sweat sensors without requiring large power storage capacity

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The system harvests energy continuously from the user's natural body movements and sweat production, creating a self-sustaining power source that maintains both compact size and continuous operation capability

Inventive Principle:

Principle #25Self-service

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 system provides stable voltage for up to four hours, enabling continuous health monitoring and data transmission, overcoming the limitations of battery-powered devices by using human motion to generate electricity and reducing the need for frequent charging.

Implementation Method 1

These devices use inductive and triboelectric effects to convert mechanical energy created by motion into electric energy capable of powering an electric device

Methodology Applied

Scientific EffectTriboelectric effect: Triboelectric Effect

Implementation Method 2

These devices use inductive and triboelectric effects to convert mechanical energy created by motion into electric energy

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS20240366117A1Systems and methods for powering autonomous sweat sensor

Publication Date: 2024.11.07 CALIFORNIA INST OF TECH

AI summary

Systems and methods for a self-powered wireless wearable sensor system include a freestanding triboelectric nanogenerator (FTENG), used as a power source for a wearable sensor. The FTENG includes stator panels and corresponding slider panels with a grating pattern. Movement, such as cardiovascular exercise causes the slider panel(s) to slide across the stator panel(s) inducing a charge and powering a wearable device sufficiently to support data transmission and continuous monitoring. An integrated self-powered wireless wearable sensor system includes a microfluidic sweat sensor patch which may be connected to lower-power wireless sensor circuitry for regulating power efficiently and is powered by the FTENG.