Wearable Sensor Turn Protocol for Pressure Ulcer Prevention
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Solution Overview
Problem
Current systems fail to reliably detect and manage pressure ulcers by unable to accurately measure surface pressure at specific body regions, differentiate between pressure from a person and non-person contact, and compute the cumulative pressure-time index, leading to inadequate pressure relief and increased risk of pressure-induced ischemia.
Innovation Solution
A wearable sensor system that uses multi-axial accelerometers and body surface markers to monitor a person's position, orientation, and movement, optimizing surface pressure distribution by selectively modulating pressure at compromised tissue areas and automatically adjusting turn protocols based on sensor data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alarm systems are used to detect person movement, then compliance with turning protocols can be improved, but the systems cannot reliably determine if the movement resulted in adequate depressurization from specific body regions
Solution Approach 1:
The patent divides the monitoring system into multiple independent pressure sensors positioned at specific body regions (sacrum, heels, hips, etc.). Each sensor independently measures pressure at its location, allowing the system to segment the body into multiple monitoring zones. This segmentation enables precise measurement of pressure relief at each region while maintaining overall compliance detection.
Solution Approach 2:
The patent introduces pressure-sensitive foam material as an intermediary between the person's body and the support surface. This foam contains embedded pressure sensors that indirectly measure the pressure exerted by body regions. The foam acts as a mediator that converts complex pressure distribution into measurable sensor signals, enabling precise pressure monitoring without direct contact sensors on the skin.
2Measurement precision
If pressure sensitive mats are placed under a person to measure surface pressure, then overall surface pressure can be detected, but the mats cannot directly measure pressure at discrete regions of the body or distinguish between person contact and non-person contact
Solution Approach 1:
The patent segments the pressure measurement function into multiple discrete sensor locations rather than using a single comprehensive mat. Each sensor monitors a specific body region independently, simplifying the measurement task for each sensor while providing detailed regional pressure data. This segmentation approach reduces the complexity of individual sensors compared to a full-body mat system.
Solution Approach 2:
The patent designs a multi-functional sensor system that simultaneously performs multiple functions: detecting person contact, measuring pressure magnitude, monitoring pressure duration, and tracking pressure changes over time. The same pressure sensors serve all these purposes, eliminating the need for separate detection systems and reducing overall device complexity.
3Reliability
If turning protocols require frequent position changes to prevent pressure ulcers, then pressure relief can be improved, but compliance becomes difficult to maintain
Solution Approach 1:
The patent implements a feedback system where pressure sensors continuously monitor pressure at critical body regions and provide real-time information to caregivers. When pressure exceeds thresholds or remains elevated for too long, the system generates alerts prompting position changes. This feedback loop makes compliance easier by providing clear, objective guidance on when turning is needed, rather than relying on fixed schedules or caregiver judgment.
Solution Approach 2:
The patent enables the monitoring system to automatically track and record pressure data, calculate cumulative pressure-time indices, and generate compliance reports without human intervention. The system serves itself by autonomously monitoring pressure, analyzing data trends, and providing objective compliance measurements, reducing the operational burden on caregivers while maintaining reliable pressure ulcer prevention.
4Object-affected harmful factors
If support surfaces are used to minimize overall surface pressure, then pressure ulcer risk can be reduced, but different regions of the body have different pressure thresholds that cannot be selectively addressed
Solution Approach 1:
The patent segments the support surface into multiple independent pressure monitoring zones, each corresponding to a specific body region (sacrum, heels, hips, etc.). Each zone has its own pressure sensor that independently measures and reports pressure at that location. This segmentation allows the system to identify and address pressure problems at specific regions rather than treating the entire surface uniformly.
Solution Approach 2:
The patent applies the principle of local quality by enabling different pressure management strategies for different body regions based on their specific pressure thresholds and ulcer risk. The system can identify regions where pressure exceeds local thresholds and trigger targeted interventions for those specific areas, rather than requiring uniform pressure reduction across the entire support surface.
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 prevents and treats pressure ulcers by providing real-time monitoring and optimized pressure management, reducing the risk of pressure-induced ischemia and promoting healing through improved blood circulation and airflow.
Implementation Method 1
A wearable sensor system that uses multi-axial accelerometers and body surface markers to monitor a person's position, orientation, and movement
Data Source
AI summary
Systems, devices, and methods are provided for managing a turn protocol for a person. A turn protocol may define turn protocol parameters, e.g., (a) turn angle parameters regarding defined orientations or orientation changes, (b) turn time or frequency parameters corresponding with defined orientations or orientation changes, and/or (c) depressurization parameters regarding a defined depressurization of area(s) of the person's body over time. A wearable sensor device may include sensor(s) and a processor to determine whether the person has moved from a bed or other support surface to a bed exit state, a standing state, or an ambulating state, and in response, automatically suspend the turn protocol and/or adjust selected turn protocol parameter(s) of the turn protocol. In other embodiments, the wearable sensor device may monitor an inclination angle of the person's torso, and automatically adjust turn parameter(s) of the turn protocol as a function of the determined torso inclination angle.