Multi-Frequency Bioimpedance Muscle Volume Assessment
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Solution Overview
Problem
Current methods for assessing skeletal muscle mass/volume, such as neutron activation, dual-energy X-ray absorptiometry, and nuclear magnetic resonance imaging, are invasive, expensive, time-consuming, and lack accuracy due to oversimplified models that fail to account for individual physiological differences, making them poorly generalizable.
Innovation Solution
A non-invasive bioelectrical impedance analysis method using multiple electrodes to measure electrical resistance and reactance values, incorporating muscle conductivity and permittivity constants, and applying corrective terms based on measurement frequency to accurately determine muscle section and volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional BIA methods are used to assess skeletal muscle mass, then the assessment can be performed noninvasively and quickly, but the accuracy is poor due to oversimplified models that do not account for individual physiological differences
Solution Approach 1:
The patent changes the electrical parameters used in BIA from conventional single-frequency resistance measurements to multi-frequency impedance measurements, incorporating both resistance and reactance components. This parameter change enables the model to distinguish between intracellular and extracellular fluid compartments, significantly improving measurement accuracy while maintaining noninvasive operation
Solution Approach 2:
The patent segments the body into distinct anatomical regions (e.g., limbs, trunk) and further segments the fluid compartments into intracellular and extracellular portions. By applying electrodes at multiple locations and analyzing impedance gradients across segments, the method achieves accurate regional muscle assessment without requiring complex whole-body positioning
2Device complexity
If standard BIA models are used, then the assessment can be performed with simple equipment, but the models are highly population specific and poorly generalizable
Solution Approach 1:
The patent implements a dynamic modeling approach where impedance values are measured at multiple frequencies and the model adaptively adjusts parameters based on the frequency-dependent behavior of biological tissues. This dynamic measurement strategy allows the same simple equipment to accurately assess diverse populations by capturing the electrical properties of different tissue compositions
Solution Approach 2:
The patent creates a universal BIA model that functions across different populations by incorporating multi-frequency measurements that reveal fundamental electrical properties of muscle tissue regardless of individual variations. The model can assess different body regions and population groups using the same equipment and methodology, achieving broad generalizability
3Measurement precision
If advanced imaging methods like NMR or CT are used, then high accuracy can be achieved, but the methods are expensive, time-consuming, and require specialized facilities
Solution Approach 1:
The patent replaces complex mechanical imaging systems (NMR, CT) with an electrical measurement system based on bioelectrical impedance analysis. By substituting mechanical/scanning-based methods with electrical field-based measurements, the invention achieves comparable accuracy to advanced imaging while reducing assessment time from minutes to seconds and eliminating the need for specialized facilities
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 method provides a bedside, population-agnostic, and highly accurate assessment of muscle volume, showing excellent agreement with nuclear magnetic resonance imaging results, with improved precision and reduced costs and complexity.
Implementation Method 1
at least two electrical resistance values measured through different electrodes located on different locations of the body
Implementation Method 2
The at least two electrical resistance values may be measured by bioelectrical impedance analysis
Data Source
AI summary
A method for determining a muscle section of a body part. The muscle section (S) is determined as a function of:at least two electrical resistance values measured through different electrodes located on different locations of the body, at least two electrodes being located along the body part, anda muscle conductivity constant (σ), anda permittivity constant of the muscle (ε).