Tetrapolar Electrode Array for Hydration and ECG Monitoring
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Solution Overview
Problem
Existing impedance monitoring devices are inadequate for real-time monitoring of tissue hydration levels, particularly extracellular fluid, and do not effectively integrate with ECG signals to assess heart performance and cardiac output.
Innovation Solution
A bioelectric impedance monitoring device using a four-electrode system measures impedance at multiple frequencies to determine extracellular and intracellular hydration levels, and integrates with ECG data to calculate heart rate and cardiac output parameters, utilizing a microcontroller for signal processing and a portable base unit for real-time monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a four-electrode impedance monitoring system is implemented, then measurement precision of tissue hydration levels is improved, but device complexity increases
Solution Approach 1:
The system divides the measurement function into four separate electrodes with distinct roles: two current-injecting electrodes and two voltage-sensing electrodes. This segmentation allows for independent optimization of each electrode's function, improving measurement precision by eliminating the influence of electrode impedance on voltage measurements while the modular electrode design helps manage system complexity
Solution Approach 2:
The patent introduces an intermediary processing system that includes a microcontroller and signal processing circuitry. This intermediary layer handles the complex tasks of signal acquisition, processing, and analysis, thereby improving measurement precision through advanced algorithms while shielding the user from the underlying system complexity
2Measurement precision
If multi-frequency impedance measurement is performed, then measurement precision of extracellular and intracellular hydration is improved, but use of energy increases
Solution Approach 1:
The system employs periodic impedance measurements at multiple frequencies rather than continuous measurement. The microcontroller is configured to sequentially apply different frequencies and process the results, which improves measurement precision for distinguishing extracellular and intracellular hydration while reducing overall energy consumption compared to continuous multi-frequency operation
Solution Approach 2:
The patent implements a multi-frequency measurement system that uses a limited set of discrete frequencies rather than a continuous spectrum. This partial action approach provides sufficient precision for differentiating tissue hydration compartments while consuming less energy than a full-spectrum analysis would require
3Reliability
If integration with ECG signals is implemented, then reliability of heart performance assessment is improved, but device complexity increases
Solution Approach 1:
The patent merges the impedance monitoring function with ECG signal acquisition into a single integrated system. The same electrode array serves dual purposes: measuring impedance for tissue hydration assessment and capturing ECG signals for cardiac performance evaluation. This merging improves reliability by correlating both datasets while avoiding the complexity of completely separate systems
Solution Approach 2:
The electrode array and signal processing system are designed with multi-functionality, capable of performing both impedance measurements and ECG monitoring. The microcontroller is programmed to selectively process different signal types from the same hardware platform, thereby improving the reliability of heart performance assessment through integrated data collection while managing device complexity through unified architecture
4Productivity
If real-time monitoring is implemented, then productivity of clinical assessment is improved, but use of energy by stationary object increases
Solution Approach 1:
The system implements continuous real-time monitoring of impedance and ECG signals, providing ongoing clinical assessment data without interruption. The microcontroller continuously processes incoming signals and updates measurements, which improves productivity by enabling immediate detection of physiological changes while the portable base unit manages energy consumption through efficient processing algorithms
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
Enables real-time monitoring of tissue hydration and cardiac parameters, providing accurate and reliable data for clinical assessments.
Implementation Method 1
measuring a bioelectric impedance of the user with the impedance measuring device
Implementation Method 2
determine an electrocardiogram (ECG) signal from the electrical characteristics of the user
Data Source
AI summary
One or more electrodes for a portable bioelectric impedance monitor and methods using the monitor can measure and monitor extracellular fluid levels and/or cardiac signals using bioimpedance. The monitor may include a tetrapolar electrode array lead with four electrodes arranged sequentially and axially along the lead, and circuitry coupled with the at least four electrodes configured to measure bioelectric impedance extracellular fluid and/or cardiac signals in a human subject at various frequencies. The electrodes are adhered to a human subject/patient on the patient's torso or one of the patient's limbs.