Shared ADC Channel for AED Signal Measurement
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Solution Overview
Problem
Current automatic external defibrillators require multiple independent measuring channels for accurate measurement of patient impedance, ECG waveform data, and pace pulse, leading to hardware complexity and reduced accuracy due to conflicting sampling rate and accuracy requirements.
Innovation Solution
A front-end measuring system with a shared sampling channel using a difference amplifier and analog-to-digital converter, which oversamples signals and extracts them according to predetermined sampling rates and accuracies required by each parameter, allowing for the measurement of patient impedance, ECG waveform data, and pace pulse using a single channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three independent measuring channels are used to measure patient impedance, pace pulse, and ECG waveform data, then the sampling rate and accuracy requirements of different signals are met, but the hardware complexity increases
Solution Approach 1:
The patent merges three independent measuring channels into a single shared sampling channel that sequentially measures patient impedance, pace pulse, and ECG waveform data. The ADC is shared among all three measurement functions, reducing hardware complexity while maintaining measurement accuracy through time-division multiplexing and signal processing techniques.
Solution Approach 2:
The sampling channel is designed with multi-functionality to perform three different measurement tasks (impedance, pace pulse, and ECG) using the same hardware components. The system dynamically configures the sampling channel to adapt to different measurement requirements, making the hardware universal rather than dedicated to specific functions.
2Speed
If an ADC with high sampling rate is used, then the sampling rate requirement is met, but the accuracy decreases
Solution Approach 1:
The system dynamically adjusts the sampling rate and ADC resolution based on the specific measurement task. For impedance measurement, a higher sampling rate is used with lower precision requirements, while for ECG waveform data, a lower sampling rate with higher precision is applied. This dynamic configuration optimizes both speed and accuracy for different measurement types.
Solution Approach 2:
The patent changes the operational parameters of the ADC based on the measurement type. The system selectively modifies sampling rate, bit resolution, and filtering parameters to match the specific requirements of each measurement (impedance, pace pulse, or ECG), thereby achieving optimal performance without requiring a single high-performance ADC for all functions.
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 reduces hardware complexity, minimizes noise interference, and improves measurement accuracy, enabling the automatic external defibrillator to effectively determine shockable rhythms and ensure proper electrode connection.
Implementation Method 1
the shared sampling channel comprises a difference amplifier and an analogy-to-digital converter
Implementation Method 2
the analogy-to-digital converter converts an input analog signal to a digital signal by sampling the input analog signal with a predetermined sampling rate
Data Source
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AI summary
A front-end measuring system of an automatic external defibullator, an automatic external defibrillator and a measuring method. Firstly, making an analog to digital converter perform the oversampling when the original data is sampled, and then extracting sample values from the oversampled signals respectively according to a set ratio in the subsequent processing, so that one sampling channel can be shared by two or three of the three measuring channels of the impedance , ECG signal and Pace signal of a patient, therefore, the amount of the hardwares in the measuring system is reduced by the front-end measuring system of the automatic external defibrillator, and then the problems of device dispersivity and node interference caused by the large amount of the hardwares are reduced, and the accuracy of measuring result of an instrument id improved.