Dual-Function Active Matrix Sensor Array for Pressure Ulcer Detection
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Solution Overview
Problem
Current devices for monitoring pressure ulcers are costly and limited in their ability to simultaneously detect multiple environmental factors such as pressure, temperature, and moisture over large areas of the body, making early detection of pressure ulcers inefficient.
Innovation Solution
A flexible electronic sensor array with an active-matrix and scanning/read-out circuitry that includes thin-film transistors and passive elements, capable of simultaneously measuring two physical quantities per sensing element, allowing for real-time data collection of pressure, temperature, moisture, pH, and other environmental conditions across large or entire body surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate sensors are used to detect pressure, temperature, and moisture, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple sensing functions (pressure, temperature, moisture detection) into a single integrated sensor element. Each sensor element contains a transistor and capacitor that can detect multiple environmental factors simultaneously, eliminating the need for separate sensor arrays for each parameter and reducing overall system complexity while maintaining measurement precision
Solution Approach 2:
The sensor elements are designed with universal functionality to detect multiple physical quantities (pressure, temperature, moisture) through a single device. The transistor-capacitor structure responds to different environmental factors in ways that can be differentiated through signal processing, allowing one sensor to perform the work of multiple specialized sensors
2Measurement precision
If a large number of sensor points are deployed to cover large body areas, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges multiple sensing capabilities into each sensor element, allowing a reduced number of elements to provide comprehensive monitoring. Each element detects pressure, temperature, and moisture simultaneously, so fewer elements are needed to achieve the same level of environmental monitoring coverage compared to using separate specialized sensors
Solution Approach 2:
The universal sensor element design allows each deployed sensor to contribute to multiple measurement dimensions (pressure maps, temperature distribution, moisture levels). This multi-functionality means that even with fewer sensor points, the system can reconstruct comprehensive environmental profiles across large body areas
3Adaptability or versatility
If multiple sensor types are used to detect different environmental factors, then adaptability is improved, but device complexity increases
Solution Approach 1:
The sensor elements are designed as universal detectors that respond to multiple environmental factors (pressure, temperature, moisture) through a single integrated structure. The transistor and capacitor components have electrical characteristics that vary in response to different environmental conditions, allowing one sensor type to replace multiple specialized sensor types
Solution Approach 2:
The patent utilizes parameter changes in the electrical characteristics of the transistor and capacitor in response to different environmental factors. By monitoring how these electrical parameters (resistance, capacitance) change under different conditions, the system can distinguish between pressure, temperature, and moisture effects using a single sensor type with multi-responsive 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
Enables cost-effective, real-time monitoring of multiple environmental factors, improving the early detection of pressure ulcers and related complications by providing comprehensive data on pressure-related conditions without the need for multiple sensors.
Implementation Method 1
a first electrical measurement is supplied by the sensel that is responsive to a change in TFT electrical characteristic
Implementation Method 2
a capacitive or inductive sensor
Data Source
AI summary
A method is provided for making multiple environmental measurements using a single sensing element. Each sensing element (sensel) includes a thin-film transistor (TFT) and a passive element. Typically, a plurality of sensels is provided arranged into an array. In response to an electrical stimulus, an electrical measurement is supplied that is responsive to a change in TFT electrical characteristic correlated to a first environmental condition, as well as a change in a characteristic of the passive element correlated to a second environmental condition. When the sensels are formed in an array, a plurality of electrical measurements is supplied corresponding plurality of locations on a monitored surface. Some exemplary environmental conditions include temperature, pressure, moisture, chemicals, oxygen, solution pH, salinity, and shear. The method determines the first environmental condition independent of the second environmental condition, while determining the second environmental condition independent of the first environmental condition.