Sensor for Absorbent Article Wetness Detection
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Solution Overview
Problem
Existing absorbent articles lack effective means for caregivers to monitor the wetness status, leading to inadequate timing for changes, which can cause discomfort and skin issues for users.
Innovation Solution
Integration of a sensor system within the absorbent article, comprising conductive ink and a wetness indicator, which communicates with an indicator device to provide visual and auditory feedback on the wetness level and diaper size, allowing for timely changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor system is integrated into the absorbent article, then wetness detection capability is improved, but device complexity increases
Solution Approach 1:
The sensor system is extracted as a separate indicator device that can be attached to the absorbent article, rather than being permanently integrated. This allows the sensor functionality to be added without permanently complicating the article structure. The indicator device includes a processor, memory, and sensor elements that can be detached and reused.
Solution Approach 2:
The indicator device serves multiple functions: it detects wetness levels, determines diaper size, provides visual indicators through LED lights, and communicates with mobile devices. This multi-functionality consolidates what would otherwise require multiple separate systems into a single device, managing complexity while enhancing capabilities.
2Loss of information
If visual and auditory feedback indicators are added, then user awareness of wetness status is improved, but device complexity increases
Solution Approach 1:
The system uses color-changing LED indicators to communicate wetness status visually. Different colors indicate different wetness levels or diaper sizes, providing immediate and intuitive feedback to the user without requiring complex displays or text output.
Solution Approach 2:
The indicator device automatically detects wetness and provides feedback without requiring user intervention. The sensor continuously monitors the absorbent article and triggers appropriate visual or auditory signals when thresholds are exceeded, making the system self-monitoring and self-communicating.
3Measurement precision
If conductive ink and wetness indicator are integrated, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The conductive ink and wetness indicator components are designed to be disposable and inexpensive. The indicator device can be attached and removed without affecting the absorbent article, and the components are low-cost enough that precision manufacturing requirements can be relaxed while maintaining adequate performance.
Solution Approach 2:
The system uses changes in electrical conductivity parameters detected by the sensor to determine wetness status. The conductive ink provides a measurable electrical path that changes when wet, allowing for precise detection without requiring complex mechanical or optical measurement systems that would demand higher manufacturing precision.
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 sensor system enables caregivers to accurately determine when the absorbent article needs to be changed, reducing the risk of skin irritation and improving user comfort by ensuring timely replacements.
Implementation Method 1
The sensor system may include a conductive ink and a wetness indicator
Implementation Method 2
a wetness indicator, which communicates with an indicator device to provide visual and auditory feedback on the wetness level
Data Source
AI summary
A sensor for monitoring wetness in a diaper or other absorbent article includes a housing that attaches to the absorbent article. The sensor may include inner and outer housing portions that capture an edge of the absorbent article between the housings. The sensor may include contacts that electrically connect with a pair of contact strips embedded in the absorbent article. The distance between the embedded strips may vary depending on the size of the absorbent article. The sensor may include multiple pairs of contacts that are spaced apart to match the distance between the contact strips for the variously sized absorbent articles. In this way, depending on the pair of contacts connected to the contact strips, the sensor may indicate the size of the absorbent article. The sensor may have a housing with a cavity and a lid that closes the cavity. The lid may be secured with a latch.