Sweat Sensing Apparatus with Responsive Flow Control
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Solution Overview
Problem
Existing sweat sensing devices face inaccuracies and damage due to varying sweat production rates, leading to biofouling and signal quality issues, as they are often designed for specific sweat amounts and not adaptable for a range of production rates.
Innovation Solution
A sweat sensing apparatus with a responsive material that changes form in response to stimuli, such as electrical or fluidic cues, to control the amount of sweat reaching the sensing component, using a sweat transport channel and redirecting components positioned at the outlet or inlet to manage sweat flow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensing component receives sweat directly without control, then the measurement can be obtained, but the sensor is damaged by biofouling when excessive sweat is produced
Solution Approach 1:
A sweat redirecting component is introduced as an intermediary element between the sweat source and the sensing component. This redirecting component controls the flow of sweat, preventing excessive sweat from reaching the sensor while still allowing sufficient sweat for measurement. The intermediary structure mediates the interaction between sweat and sensor, protecting the sensor from biofouling damage caused by uncontrolled sweat exposure.
Solution Approach 2:
The sweat redirecting component changes its physical parameters (such as pore size, channel width, or flow resistance) in response to sweat rate variations. When sweat production is high, the redirecting component adjusts to reduce sweat flow to the sensor; when sweat production is low, it allows more sweat through. This dynamic parameter adjustment maintains optimal sweat flow conditions for sensor operation across varying sweat rates.
2Measurement precision
If the sensing component is designed for specific sweat amounts, then measurement accuracy is improved, but the device cannot adapt to a range of sweat production rates
Solution Approach 1:
The sweat redirecting component is designed with dynamic characteristics, allowing it to change its flow control properties in response to varying sweat rates. Rather than being a fixed structure, it adapts its configuration to match the current sweat production level, enabling the sensing component to maintain optimal operating conditions across a wide range of sweat rates. This dynamic adaptation preserves measurement precision regardless of whether the subject produces low or high amounts of sweat.
Solution Approach 2:
The system incorporates feedback mechanisms where the sweat redirecting component responds to sweat rate information to adjust its flow control. By monitoring sweat production levels and adjusting the redirecting component accordingly, the system maintains optimal sweat flow to the sensor, ensuring accurate measurements across different sweat production rates without requiring multiple specialized sensors.
3Measurement precision
If too much sweat reaches the sensor, then sufficient signal is obtained, but accumulation effects occur mixing new and old sweat
Solution Approach 1:
The sweat redirecting component acts as a flow mediator that regulates sweat delivery to the sensing component. It controls the rate and volume of sweat reaching the sensor, ensuring a steady, controlled flow that prevents accumulation of old sweat while maintaining sufficient signal strength. This mediation eliminates the mixing problem by providing continuous fresh sweat samples without overflow or stagnation.
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 apparatus ensures accurate sweat measurement across different sweat production rates by controlling the amount of sweat reaching the sensor, reducing biofouling and maintaining optimal signal quality, making it suitable for both low and high sweat production scenarios.
Implementation Method 1
the responsive material may comprise at least one material selected from a group comprising: an electroactive polymer, and a piezoelectric material
Implementation Method 2
The stimulus may, in some embodiments, comprise a fluidic stimulus to bring about a change in the form of the responsive material responsive to an amount of sweat contacting the responsive material exceeding a threshold amount. The responsive material may comprise a hydrogel.
Implementation Method 3
a sweat transport channel, and a sweat redirecting component
Data Source
AI summary
According to an aspect, there is provided an apparatus (100) comprising a sweat sensing component (102) for measuring a parameter relating to sweat generated by sweat glands of a subject; a sweat transport channel (104); and a sweat redirecting component (106) comprising a responsive material whose form is configured to change in response to a stimulus, so as to redirect sweat and control an amount of sweat able to be transported to the sweat sensing component (102) via the sweat transport channel (104), wherein the sweat redirecting component is positioned at an outlet of the sweat transport channel, such that, in a first configuration, the form of the responsive material is such that the sweat redirecting component prevents the passage of sweat through the outlet, and directs the passage of sweat to the sweat sensing component; and, in a second configuration, the form of the responsive material is such that the sweat redirecting component permits the passage of sweat through the outlet.