Bioimpedance Tissue Viability Mapping for Burn Depth Assessment
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Solution Overview
Problem
Existing methods for assessing tissue viability around wounds, particularly burns, are inadequate as they rely on visual and tactile evaluations that are subjective and dynamic, making it difficult to accurately determine the depth and extent of tissue damage.
Innovation Solution
The use of bioimpedance sensors, such as toroidal and electrode arrays, to measure sub-epidermal moisture (SEM) levels, which indicate tissue viability by mapping zones of varying moisture content around wounds, allowing for precise assessment of tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual and tactile evaluation methods are used to assess tissue viability, then the assessment process is simple and quick, but the measurement precision and reliability are insufficient
Solution Approach 1:
The patent replaces subjective visual and tactile mechanical assessment methods with objective electrical measurement systems. Bioimpedance sensors and electrical field-based devices measure tissue electrical properties (impedance, capacitance, conductance) to quantify tissue viability, substituting human sensory evaluation with instrumental electrical measurements that provide precise, quantifiable data about tissue state.
Solution Approach 2:
The invention measures changes in electrical parameters (impedance, capacitance, conductance, phase angle) of tissue to assess viability. By monitoring how these electrical parameters change in response to tissue damage and healing processes, the system provides objective quantification of tissue state, transforming the assessment from subjective visual judgment to objective parameter-based measurement.
2Reliability
If visual assessment methods are used, then the device complexity is low, but the ability to detect dynamic changes in tissue state is limited
Solution Approach 1:
The patent implements feedback mechanisms where electrical measurements are continuously or repeatedly taken to monitor tissue state changes over time. The system provides feedback on tissue viability status, allowing clinicians to track progression of damage or healing processes. This temporal feedback capability enables detection of dynamic changes that static visual assessment cannot capture.
Solution Approach 2:
The system replaces unreliable visual detection with reliable electrical field-based detection. Bioimpedance sensors and electrical measurement devices provide consistent, reproducible detection of tissue state changes based on fundamental electrical properties of biological tissue, eliminating the subjectivity and variability inherent in visual assessment methods.
3Measurement precision
If quantitative measurement methods are implemented, then measurement precision improves, but the ease of operation decreases
Solution Approach 1:
The patent employs devices that automatically perform measurements and calculations without requiring complex manual procedures. The bioimpedance sensors and electrical measurement systems self-calibrate and automatically compute tissue viability parameters from raw electrical signals, reducing the operational burden on clinicians while maintaining high measurement precision.
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
Provides a quantitative method to differentiate between viable and non-viable tissue, guiding clinicians in treatment decisions by accurately identifying zones of necrosis, edema, and potential tissue recovery, reducing unnecessary surgeries and prolonged treatment times.
Implementation Method 1
The use of bioimpedance sensors, such as toroidal and electrode arrays, to measure sub-epidermal moisture (SEM) levels
Data Source
Figure 1A~1B
Figure 1C
Figure 2~3
AI summary
The present disclosure provides apparatuses and methods for measuring subepidermal moisture as an indication of tissue viability and providing information regarding the location of a boundary of non-viable tissue.