Pressure Sensing Mat With Transverse Conductive Paths
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Solution Overview
Problem
Current pressure sensing mats lack efficient and cost-effective methods to detect and respond to pressure distribution on support structures, such as beds and mattresses, which can lead to pressure sores and discomfort, and often require complex and costly manufacturing processes.
Innovation Solution
A pressure sensing mat comprising three layers of fabric, with conductive and non-conductive materials, where the second layer is pressure-sensitive and includes piezoresistive, piezoelectric, or capacitive materials, and a control module that communicates pressure data to adjust inflatable zones for comfort and prevention of pressure sores, using a system that includes a mattress with fluid bladders and a controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional pressure sensing mats are used, then pressure detection function is provided, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines multiple functions into a single integrated mat structure. The conductive strips are woven directly into the fabric layers during manufacturing, merging the sensing function with the structural support function. This eliminates the need for separate sensor arrays and complex assembly processes, reducing manufacturing complexity while maintaining pressure detection capability.
Solution Approach 2:
The patent uses composite material structures with conductive strips integrated into fabric layers. The combination of conductive materials with textile materials creates a unified structure that serves both mechanical support and electrical sensing functions, simplifying the overall device architecture and manufacturing process.
2Measurement precision
If complex manufacturing processes are used to create accurate pressure sensors, then sensing precision improves, but manufacturing cost increases
Solution Approach 1:
The mat structure serves itself by using the same fabric layers for both mechanical support and electrical conduction. The conductive strips are self-integrated into the fabric during weaving, eliminating the need for separate manufacturing steps for structural components and sensing elements, thereby reducing manufacturing cost while maintaining sensing accuracy.
Solution Approach 2:
The patent divides the mat into discrete functional zones using conductive strips arranged in specific patterns. Each strip or group of strips can independently sense pressure in specific regions, allowing for modular manufacturing and assembly that reduces overall complexity and cost while maintaining precise pressure measurement capability.
3Measurement precision
If multiple fabric layers with different materials are integrated, then pressure sensitivity improves, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple fabric layers with different materials into a single integrated textile structure using weaving or knitting techniques. This allows different materials to be combined at the fiber level during manufacturing, achieving pressure sensitivity enhancement without requiring complex post-manufacturing assembly of separate layers.
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 solution effectively detects pressure distribution in real-time, allowing for automatic adjustment of support structures to prevent pressure sores and enhance comfort, while reducing manufacturing costs through innovative use of materials and processes.
Implementation Method 1
The pressure sensitive second layer may be a piezoresistive layer
Implementation Method 2
The pressure sensitive second layer may be a piezoelectric layer
Implementation Method 3
The pressure sensitive second layer may be a capacitive layer
Data Source
AI summary
A pressure sensing sheet includes at least first, second, and third layers wherein the first and third layers each have conductive paths defined therein that are separated by nonconductive spacers. The orientation of the conductive paths of the first layer are transverse to the orientation of the conductive paths of the third layer. The second layer is made of material that has an electrical characteristic that changes with applied pressure, such as, but not limited to, piezoresistive or piezoelectric material. The first and/or third layers are made from multi-material sheets wherein a first type of material will repel conductive particles when subjected to an autocatalytic coating process, while the second type of material will bond with the conductive particles during the autocatalytic coating process. The use of different materials in the first and/or third layers facilitates the manufacturing of the conductive paths and nonconductive spacers.