EMG Signal Separation Using Vectorial Propagation Analysis
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Solution Overview
Problem
Current EMG measurement techniques face challenges in distinguishing between useful and interference signals, particularly in areas with muscle superimposition, leading to uncertainty in identifying the physiological origin of signals and reduced robustness in measurements.
Innovation Solution
A method involving the use of at least three electrodes placed on different axes to detect EMG signals, measure voltage along these axes, and determine the muscular direction of propagation, which helps in separating useful and interference signals and identifying the signal-causing muscle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple EMG channels are used to cover several muscle groups, then the measurement area increases, but the ability to unambiguously assign measurement areas to single muscles decreases due to muscle overlap
Solution Approach 1:
The patent extends the measurement from two-dimensional signal strength mapping to three-dimensional vector field analysis by incorporating propagation direction information. This additional dimension enables differentiation of superimposed muscles through their distinct propagation directions, resolving the ambiguity caused by muscle overlap while maintaining comprehensive coverage
2Device complexity
If only signal strength between electrodes is measured, then the measurement method remains simple, but the information content remains limited and cannot differentiate contractions of different superimposed muscles
Solution Approach 1:
The patent adds the propagation direction dimension to the traditional signal strength measurement, transforming scalar measurements into vector measurements. This enables the system to differentiate between superimposed muscles without significantly increasing device complexity, as the same electrode array can provide both magnitude and direction information through vector field analysis
3Adaptability or versatility
If EMG measurements are performed in areas with muscle superimposition, then comprehensive muscle coverage is achieved, but the robustness of measurements decreases due to inability to distinguish signal origins
Solution Approach 1:
By incorporating propagation direction as an additional dimension, the patent enables reliable source identification even in areas with muscle superimposition. The vector field approach allows differentiation of multiple muscle contributions through their distinct directional characteristics, maintaining measurement robustness while achieving comprehensive muscle coverage
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 approach enhances the robustness of EMG measurements, improves the distinction between actual muscle contractions and interference, and provides more detailed information by determining the plausible signal origin, thus increasing immunity to interference.
Implementation Method 1
EMG records the summed potential of all active muscle fibers, measuring the muscle action potentials by differential voltage measurement
Implementation Method 2
When a muscle is stimulated, an action potential is generated in the muscle fibers, which, due to the anisotropic conductivity properties of a muscle fiber, propagates preferentially in the direction of the fiber
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A method for separating useful and unwanted signals in an electromyographic (EMG) measurement and/or for determining the signal-generating muscle in an electrically active region of muscles, the use of the method for EMG diagnostics, for controlling prostheses, for training muscles, or for controlling computer programs and/or computer games, and a computer-implemented method, a computer program product, a computer-readable storage medium, and a device for separating useful and unwanted signals in an EMG measurement and/or for determining the signal-generating muscle in an electrically active region of muscles are provided.