Passive RFID Mat for Incontinence Detection
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Solution Overview
Problem
Current incontinence monitoring systems, particularly those using RFID tags, face issues such as false positive readings due to body capacitance, require continuous RF emissions, and are not suitable for real-time notification of incontinence events, leading to prolonged skin exposure and potential complications like Incontinence-Associated Dermatitis (IAD).
Innovation Solution
A flexible mat embedded with multiple RFID sensor tags and antennas, placed beneath a patient, detects moisture and other incontinence-related parameters without needing attachment to absorbent articles, providing redundant data verification to minimize false positives and alert caregivers promptly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID tags are used to detect incontinence events, then real-time monitoring capability is improved, but false positive readings occur due to body capacitance interference
Solution Approach 1:
The system divides the detection task into multiple independent RFID tags positioned at different locations on the underpad. Each tag independently monitors moisture in its specific zone, allowing the system to cross-validate readings and distinguish true incontinence events from false positives caused by body capacitance at any single location.
Solution Approach 2:
The patent introduces an intermediary processing layer that analyzes signals from multiple RFID tags before triggering an alarm. This intermediary system evaluates the spatial and temporal patterns of moisture detection across multiple tags, filtering out false positives from body capacitance while maintaining sensitivity to genuine incontinence events.
2Reliability
If active RFID tags with continuous RF emissions are used, then detection reliability is improved, but harmful RF exposure to patients increases
Solution Approach 1:
The system employs passive RFID tags that are periodically interrogated by a reader rather than continuously transmitting. The tags only activate their RF transponders when queried, creating intermittent rather than continuous RF exposure. This periodic action maintains detection capability while significantly reducing cumulative RF energy exposure to the patient.
Solution Approach 2:
Passive RFID tags harvest energy from the interrogating RF field to power their internal circuitry and respond. This self-service mechanism eliminates the need for batteries or continuous power supply, allowing the tags to remain dormant until queried, thereby minimizing RF exposure while maintaining functional reliability.
3Reliability
If multiple RFID tags are deployed for redundant verification, then false positive reduction is improved, but device complexity increases
Solution Approach 1:
The patent uses identical, commercially available passive RFID tags for multiple purposes: moisture detection, spatial location identification, and signal validation. Each tag serves as both a unique identifier and a functional sensor, eliminating the need for specialized complex sensor designs while achieving redundant verification through multiple identical units.
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 false alarms, ensures timely attention to incontinence events, and minimizes skin exposure, thereby reducing the risk of IAD, while using passive RFID tags to avoid continuous RF emissions and utilizing off-the-shelf generic absorbent articles.
Implementation Method 1
RFID sensor tags embedded in a flexible mat detect incontinence on a discrete absorbent pad
Implementation Method 2
when its antenna resonates with a signal generated by its mating transceiver, the energy received powers on the tag integrated circuit
Implementation Method 3
Passive RFID tags can be queried via a frequency with which the antenna is resonant
Data Source
AI summary
A system comprises a series of passive RFID tag sensors each embedded on top of its own matching antenna inside a flexible substrate. The sensors are driven by a controller-transceiver. The controller-transceiver sends RF signals through an antenna to each RFID tag sensor and receives data transmitted back from the same sensors. Sensors are embedded in a flexible substrate positioned under an unaltered incontinence absorbent pad and juxtaposed to derive further information. Multiple sensors provide sensing of physical-environmental data in addition to moisture. The controller makes intelligent and positive incontinence determinations by relating data to profiles indicative of correlation to incontinence conditions.