Absorbent Article RFID Sensors for Self-Tuning Wetness Detection
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Solution Overview
Problem
Existing absorbent articles lack effective monitoring systems to indicate when they become wet, necessitating visual inspection and potential infection risks, especially in healthcare settings, and there is a need to monitor bedding and mattresses for fluid exposure without removing covers.
Innovation Solution
Incorporation of passive RFID sensors and tags into absorbent articles and other structures to sense and measure wetness, with self-tuning modules to adjust impedance for accurate wetness detection, and integration with RFID readers for real-time data transmission to caregivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If visual inspection is used to monitor absorbent article wetness, then no additional devices are needed, but infection risk increases and monitoring efficiency decreases
Solution Approach 1:
The patent replaces the mechanical visual inspection method with an electromagnetic sensing system. RFID sensors and readers detect wetness through non-contact electromagnetic field interactions, eliminating the need for physical removal and visual examination of the absorbent article, thereby reducing infection risk while maintaining monitoring capability.
Solution Approach 2:
The patent introduces RFID sensors and readers as intermediary devices between the absorbent article and the caregiver. These sensors detect wetness conditions and transmit information wirelessly, serving as a mediator that eliminates direct contact between caregivers and the absorbent article, thus reducing infection risk without requiring complex manual inspection procedures.
2Measurement precision
If RFID sensors with self-tuning modules are added to absorbent articles, then wetness detection accuracy improves, but device complexity increases
Solution Approach 1:
The patent incorporates self-tuning modules that dynamically adjust the impedance of RFID sensors in real-time based on the dielectric properties of the absorbent article materials. This dynamic adaptation allows the sensors to maintain optimal detection accuracy across different article types and wetness levels, improving measurement precision while the automation reduces the need for manual calibration complexity.
Solution Approach 2:
The patent utilizes self-tuning modules to automatically change the electrical parameters (impedance) of the RFID sensors according to the specific materials and conditions of the absorbent article. This parameter adaptation enables accurate wetness detection across diverse applications without requiring complex manual adjustment procedures, thereby improving precision while managing system complexity through automation.
3Productivity
If real-time monitoring is implemented, then timely alerts for article changes are provided, but energy consumption increases
Solution Approach 1:
The patent implements periodic scanning of the absorbent article by the RFID reader rather than continuous monitoring. The system checks for wetness conditions at scheduled intervals, providing timely alerts when changes occur while minimizing energy consumption compared to continuous real-time monitoring. This periodic action maintains monitoring efficiency for detecting critical changes without the excessive energy demands of continuous operation.
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
Enables remote monitoring of wetness levels in absorbent articles and other structures, reducing the need for visual inspection and minimizing infection risks, while providing timely alerts for article changes and preventing fluid exposure.
Implementation Method 1
passive RFID sensors and tags into absorbent articles and other structures to sense and measure wetness
Implementation Method 2
self-tuning modules to adjust impedance for accurate wetness detection
Implementation Method 3
integration with RFID readers for real-time data transmission to caregivers
Data Source
AI summary
An absorbent structure, including a sensor system, can sense and measure the level of wetness contained within the absorbent structure as well as sense and measure environmental conditions. The sensor system may include passive RFID sensors or tags, RFID readers, antenna, a tuning module, a processing module, a memory module and a wireless communication module. The absorbent structure may further include two or more sensors, with a first sensor placed in a first area most likely to first be exposed to liquid and a second sensor spaced apart from the first sensor in an area likely to be exposed to liquid only after the absorbent structure has become more saturated.