EEG-Based Brain Activity Monitoring for Artificial Circulation
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Solution Overview
Problem
Existing methods for evaluating the effectiveness of artificial blood circulation during emergencies, such as cardiopulmonary resuscitation, lack a simple and effective way to monitor brain cell activity, which is crucial for assessing the adequacy of circulation in critical patients.
Innovation Solution
An apparatus and method using electroencephalography (EEG) to measure brain cell activity, calculating parameters like burst suppression ratio, delta ratio, beta ratio, and cerebral blood flow, and end-tidal carbon dioxide tension to evaluate the effectiveness of artificial circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If surgical measures are used to measure blood pressure and blood flow, then measurement precision is improved, but device complexity and ease of operation deteriorate due to invasive procedures
Solution Approach 1:
The patent replaces invasive mechanical/surgical measurement methods with non-invasive EEG-based measurement. Instead of using surgical catheters or probes to directly measure blood pressure and flow, the system uses electrical field measurements (EEG) from the scalp to indirectly assess cerebral blood flow and metabolic state, thereby eliminating the need for invasive procedures while maintaining measurement capability
Solution Approach 2:
The patent introduces EEG signals as an intermediary parameter to indirectly measure cerebral blood flow. Rather than directly measuring blood flow with invasive devices, the system uses EEG spectral analysis (particularly alpha and beta wave ratios) as a mediator that correlates with cerebral metabolic rate and blood flow, providing a non-invasive measurement pathway
2Ease of operation
If simple bio-signal measurement methods are used, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent transforms the measurement approach by changing from direct physiological parameter measurement (blood pressure, flow) to electrical parameter measurement (EEG frequency spectra). By analyzing spectral power ratios in different frequency bands (delta, theta, alpha, beta, gamma), the system extracts multiple independent parameters that collectively provide precise assessment of cerebral metabolism and blood flow through simple non-invasive EEG recording
Solution Approach 2:
The patent adds a new dimension of measurement by using frequency domain analysis of EEG signals. Instead of measuring single-point physiological parameters, the system analyzes the spectral composition across multiple frequency bands, creating a multi-dimensional parameter space (power ratios in delta, theta, alpha, beta, gamma bands) that provides comprehensive assessment of cerebral function through simple surface electrode placement
Data Source
AI summary
An apparatus for measuring brain cell activity in artificial blood circulation according to an embodiment of the present invention may include a measuring unit (10) that measures EEG signals; an analog-to-digital converter (ADC) 20 that converts the EEG signals measured at the measuring unit 10 into digital signals; a control unit 50 that calculates EEG parameters from the digital EEG signals converted at the ADC 20, and calculates end-tidal carbon dioxide tension and cerebral blood flow from the EEG parameters.