Electrical Impedance Myography for Neuromuscular Assessment
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Solution Overview
Problem
Current methods for assessing and diagnosing neuromuscular diseases are unreliable, subjective, and often painful, with limited ability to quantify muscle conditions or monitor disease progression, especially in cases of disuse atrophy.
Innovation Solution
The development of non-invasive electrical impedance myography (EIM) techniques that apply electrical signals at various orientations and frequencies to characterize muscle tissue, using multi-frequency and multidirectional approaches to provide quantitative and painless assessments of neuromuscular disorders, including disuse atrophy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If needle electromyography is used to evaluate muscle conditions, then muscle assessment capability is improved, but patient discomfort and invasiveness increase
Solution Approach 1:
The patent replaces the mechanical needle insertion method with an electrical field-based measurement system. Surface electrodes apply electrical signals to the muscle and detect impedance changes, eliminating the need for physical needle penetration while maintaining measurement capability for assessing muscle conditions.
Solution Approach 2:
The patent introduces electrical impedance as an intermediary parameter to indirectly assess muscle tissue properties. Instead of directly measuring muscle characteristics through needle insertion, the system measures impedance changes caused by muscle tissue properties, providing a non-invasive assessment method.
2Loss of information
If needle electromyography is used to diagnose neuromuscular diseases, then diagnostic information is obtained, but quantification capability remains insufficient
Solution Approach 1:
The patent measures electrical impedance parameters (resistance, reactance, phase) across multiple frequencies to create a quantitative profile of muscle tissue. By analyzing how impedance varies with frequency and orientation, the system provides objective, quantifiable data for diagnosing and monitoring neuromuscular diseases, replacing subjective qualitative assessment.
Solution Approach 2:
The patent extends the measurement approach by evaluating impedance at multiple frequencies and orientations. This multi-dimensional measurement strategy captures comprehensive tissue properties, enabling more precise quantification of muscle conditions and disease progression than single-point measurements.
3Reliability
If conventional assessment methods are used for neuromuscular diseases, then initial diagnosis is possible, but monitoring disease progression becomes difficult
Solution Approach 1:
The patent enables continuous monitoring of muscle impedance parameters over time. By repeatedly measuring impedance at multiple frequencies and orientations, the system tracks changes in muscle tissue properties, allowing clinicians to monitor disease progression and treatment response continuously rather than relying on discrete, invasive procedures.
Solution Approach 2:
The patent provides quantitative impedance measurements that serve as feedback for assessing muscle condition and disease status. These objective measurements allow for tracking changes over time and evaluating treatment effectiveness, creating a feedback loop for ongoing disease management and progression monitoring.
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
EIM offers a reliable, rapid, and repeatable method for diagnosing and monitoring neuromuscular diseases, enabling more accurate evaluation of muscle conditions and treatment effectiveness with reduced invasiveness and discomfort.
Implementation Method 1
Electrical impedance myography (EIM) offers a reliable, rapid, and repeatable method for diagnosing and monitoring neuromuscular diseases
Data Source
AI summary
Electrical impedance myography (EIM) can be used for the assessment and diagnosis of muscular disorders. EIM includes applying an electrical signal to a region of tissue and measuring a resulting signal. A characteristic of the region of tissue is determined based on the measurement. Performing EIM at different frequencies and/or different angular orientations with respect to a muscle can aid in the assessment and diagnosis. Devices are described that facilitate assessment and diagnosis using EIM.