Respiration Monitoring Electrode Placement for Abdominal Signal Detection
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Solution Overview
Problem
Current respiration monitoring techniques using impedance measurements are ineffective for abdominal breathing, leading to attenuated signals and increased motion artifacts, particularly in unconscious adults and children, as they fail to accurately detect the more efficient respiratory mode and are prone to noise.
Innovation Solution
A system with multiple electrodes and a processing circuit that measures impedance between electrodes to produce respiration parameters, using a third electrode to eliminate common mode voltage and detect fluctuations, allowing for improved signal quality and noise reduction, specifically designed to monitor abdominal respiration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional LA and RA electrodes are used for respiration monitoring, then thoracic breathing can be monitored, but the signal is attenuated when subjects transition to abdominal breathing and motion artifacts increase
Solution Approach 1:
The patent segments the respiration monitoring function by introducing a dedicated abdominal respiration lead (V5R-LL) that specifically targets abdominal breathing detection, separating it from the traditional thoracic monitoring function. This allows the system to independently monitor both thoracic and abdominal breathing modes without interference.
Solution Approach 2:
The patent introduces new electrode positions (V5R on the right thorax and LL on the left leg) as intermediaries to create a conductive path that specifically captures abdominal respiration signals. This intermediary pathway bypasses the limitations of traditional arm electrode placements.
2Reliability
If traditional ECG electrode positions are used, then standard thoracic respiration monitoring is achieved, but motion artifact and cardiogenic artifact increase
Solution Approach 1:
The patent employs asymmetric electrode placement with V5R positioned on the right thorax and LL on the left leg, creating an oblique conductive path that avoids traditional ECG artifact sources. This asymmetric configuration optimizes the measurement vector to minimize pickup of cardiac and motion-related electrical interference.
Solution Approach 2:
The patent changes the spatial dimension of the measurement by extending the conductive path from the thorax to the leg, creating a three-dimensional measurement vector that is orthogonal to traditional horizontal chest leads. This dimensional change reduces correlation with cardiac electrical activity and motion artifacts.
3Measurement precision
If impedance measurement between two electrodes is used, then respiration monitoring is achieved, but common mode voltage reduces signal quality
Solution Approach 1:
The patent introduces a third electrode (RL) as an intermediary reference point to eliminate common mode voltage. This additional electrode serves as a ground reference that cancels out common-mode interference, improving the signal-to-noise ratio of the impedance measurement.
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 provides a stronger and more accurate respiration signal with reduced noise, effectively monitoring abdominal breathing and offering clinicians a better option for respiration monitoring, enhancing flexibility and accuracy in respiration rate measurement.
Implementation Method 1
measuring impedance between the first and second electrodes
Implementation Method 2
uses the third electrode to eliminate or reduce a common mode voltage present in the signals obtained from the first and second electrodes
Data Source
AI summary
An impedance variation respiration monitor determines the variation in human body impedance between two electrodes coupled to the surface of the body. One of the two electrodes is attached to the thorax below the armpit and the other of the two electrodes is attached to the leg extending from the opposing side of the thorax. The variation in impedance between these two electrodes measured by the monitor is closely correlated to the respiration rate of the subject and is particularly responsive to and indicates combined abdominal and thoracic breathing.