Dissolvable Conductive Moisture Sensor for Diaper Alerting
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Solution Overview
Problem
Existing moisture detection systems in diapers lack efficient and reliable methods to alert caregivers of soiling, which can lead to skin irritation and infection due to prolonged exposure to urine or feces.
Innovation Solution
A moisture-sensitive system incorporating a dissolvable conductive material and a fluid-sensitive battery that dissolves in aqueous fluids, allowing for the detection of moisture and transmission of radio-frequency signals to alert caregivers when the diaper is soiled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a moisture sensor with dissolvable conductive material is used to detect aqueous fluid, then the detection reliability is improved, but the device complexity increases due to the need for dissolvable materials and circuitry
Solution Approach 1:
The patent employs dissolvable conductive material that dissolves upon contact with aqueous fluid, creating a single-use moisture detection mechanism. This disposable approach eliminates the need for complex reusable sensor systems, as the entire sensing element is discarded after one use, simplifying the overall device architecture while maintaining high detection reliability
Solution Approach 2:
The invention utilizes changes in electrical conductivity parameters as the dissolvable conductive material dissolves in aqueous fluid. The transition from conductive to non-conductive state provides a clear binary signal for moisture detection, enabling reliable detection through simple electrical parameter monitoring without complex sensing mechanisms
2Reliability
If a transmitter is operated to transmit radio-frequency signals upon moisture detection, then the alert functionality is improved, but the energy consumption increases
Solution Approach 1:
The transmitter is designed to operate periodically or on-demand rather than continuously, activating only when moisture is detected. This periodic operation mode ensures reliable alert functionality is provided when needed while minimizing energy consumption during the majority of time when no moisture is present, resolving the contradiction between alert reliability and energy usage
3Measurement precision
If dissolvable conductive material is used in the moisture sensor, then the moisture detection precision is improved, but the manufacturing complexity increases due to material deposition and curing processes
Solution Approach 1:
The patent replaces complex mechanical sensor structures with a chemical-based dissolvable conductive material system. The material can be deposited using solution-based techniques and cured through chemical processes, eliminating the need for precise mechanical assembly and complex fabrication equipment, thereby improving manufacturing ease while maintaining high detection precision through controlled material properties
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 effectively reduces skin irritation and infection risk by promptly alerting caregivers to change the diaper, improving health outcomes by detecting moisture presence and transmitting alerts through radio-frequency signals.
Implementation Method 1
a moisture sensor that includes a dissolvable conductive material that dissolves in an aqueous fluid
Implementation Method 2
a moisture sensor that includes a dissolvable conductive material that dissolves in an aqueous fluid
Data Source
AI summary
A moisture-sensitive device is provided that includes a dissolvable conductive material. Exposure of the dissolvable conductive material to urine or some other fluid causes the dissolvable conductive material to dissolve, increasing an effective resistance of the dissolvable conductive material. This change in resistance can be detected to determine the presence of an aqueous fluid. In response to such detection, a transmitter can then provide a wireless transmission indicative of the presence of the fluid. This moisture-sensitive device can be provided in a diaper and transmissions produced by the device can be detected using a smart phone or other device and used to indicate to a user that the diaper has been soiled.