RFID Wound Dressing Strain Gauge Pressure Sensor
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Solution Overview
Problem
Current reduced-pressure wound therapy systems lack effective monitoring of pressure at multiple tissue sites, leading to potential complications and inadequate tracking of healing progress, as pressure monitoring is typically centralized and only one conduit is monitored at a time.
Innovation Solution
A wireless reduced-pressure dressing system utilizing RFID technology with integrated sensors and processors, allowing for wireless transmission and reception of sensing information, enabling monitoring of pressure and other parameters at each tissue site, and using a flexible printed circuit board with a strain gauge and deflector for pressure sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If centralized pressure monitoring is used with one conduit monitored at a time, then device complexity is reduced, but measurement precision and reliability of pressure monitoring at multiple tissue sites deteriorates
Solution Approach 1:
The system divides the monitoring function into multiple independent pressure sensors, each associated with a specific tissue site or conduit. Each sensor independently monitors pressure at its location, eliminating the need for sequential monitoring and enabling simultaneous multi-site measurement, thereby improving measurement precision without proportionally increasing overall system complexity.
Solution Approach 2:
Pressure sensors are distributed to specific tissue sites rather than using a single centralized monitoring point. This local placement ensures that pressure conditions at each unique tissue site are accurately captured, accounting for local variations in pressure distribution and improving the reliability of therapy delivery at each site.
2Measurement precision
If multiple pressure sensors are integrated at each tissue site, then measurement precision and monitoring capability improve, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The pressure sensor assembly is designed as a multi-functional integrated unit that combines pressure sensing, wireless communication, and power management capabilities. This universal design allows the same sensor module to be deployed at multiple tissue sites, standardizing the system architecture and managing complexity through reuse of proven components rather than custom designs for each site.
Solution Approach 2:
The sensor assembly employs a nested structure where the pressure sensing element is integrated within a housing that contains additional functional components. This nested arrangement consolidates multiple functions into a compact unit, reducing the physical footprint and interconnection requirements, thereby managing device complexity while maintaining advanced monitoring capabilities.
3Loss of information
If real-time wireless monitoring is implemented, then information completeness and healing progress tracking improve, but energy consumption increases
Solution Approach 1:
The wireless monitoring system employs periodic transmission of pressure data rather than continuous transmission. Sensors collect pressure information continuously but transmit data at predetermined intervals or when threshold changes are detected, thereby maintaining complete healing progress information while significantly reducing energy consumption compared to continuous wireless transmission.
Solution Approach 2:
The system implements feedback mechanisms where transmission decisions are based on detected changes in pressure parameters. When pressure remains within normal ranges, transmission is minimized or suspended. When threshold violations or significant changes occur, the system activates transmission to alert clinicians, optimizing the balance between information completeness and energy conservation.
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
This system allows for real-time monitoring and control of reduced pressure at multiple tissue sites, preventing disruptions and enhancing the tracking of healing progress, ensuring consistent therapy delivery and improved patient outcomes.
Implementation Method 1
The first sensor is a pressure sensor comprised of a strain gauge associated with a deflector
Implementation Method 2
a RFID antenna coupled to the first processor
Data Source
Figure 1A
Figure 1B~1C
Figure 1D
AI summary
Systems, methods, and dressings are presented that involve using a RFID device in a dressing to provide pressure data or other data to a remote base unit. The dressing is an interactive dressing. The reduced pressure in the dressing may be monitored and used to control delivery of reduced pressure. In one instance, the pressure data at each dressing allows a plurality of tissue sites to be monitored and used with as single remote base unit. In another instance, devices and methods for assuring a proper pairing of reduced-pressure dressings and remote base units are also presented. Other systems, methods, and dressings are presented.