Electromechanical ECG Simulation With CPR Impedance Correlation
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Solution Overview
Problem
Current systems for simulating cardiopulmonary resuscitation (CPR) contamination of electrocardiogram (ECG) signals fail to accurately replicate real-life scenarios due to noise and corruption, leading to delays in defibrillation therapy and hindering the development of algorithms, as digital simulations often ignore the stochastic nature of signals and are not realistic enough.
Innovation Solution
An electromechanical system that generates both corrupted ECG and impedance signals using an analog system, comprising an ECG signal generator, a potentiometer, and a compression mechanism to adjust impedance, which physically correlates with the impedance signal, providing a more realistic representation of CPR effects on thoracic impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If digital simulation is used to generate ECG signals during CPR, then signal generation is simplified and can be easily controlled, but the stochastic nature of real signals is ignored and realism is reduced
Solution Approach 1:
The patent replaces digital signal processing with an analog electromechanical system. A compression mechanism physically compresses a potentiometer to generate impedance variations, and an operational amplifier circuit amplifies the ECG signal with added noise. This analog approach naturally captures the stochastic nature of real CPR signals while maintaining ease of control through mechanical compression.
Solution Approach 2:
The system dynamically changes electrical parameters (impedance, noise level) based on mechanical compression input. The potentiometer's resistance varies with compression force, and the operational amplifier adjusts gain and noise injection accordingly, creating realistic signal variations that mirror actual physiological changes during CPR.
2Reliability
If field data is collected from distributed AEDs, then real-life scenarios are captured, but the data is corrupted or noisy and requires high administrative work
Solution Approach 1:
Instead of collecting and processing raw field data, the system creates a controlled copy of real CPR conditions through physical compression of the analog circuit. This generates authentic-looking corrupted ECG signals without the administrative burden of data collection, cleaning, and validation required by field data approaches.
Solution Approach 2:
The analog compression mechanism automatically generates realistic noise and impedance variations through pure physics, eliminating the need for manual data processing, artifact removal, or administrative overhead associated with field data collection.
3Reliability
If analog systems are used to generate ECG signals, then realistic CPR-corrupted signals are produced that physically correlate with impedance signals, but the device complexity increases compared to digital systems
Solution Approach 1:
The patent uses a relatively simple mechanical compression mechanism acting on a potentiometer, rather than complex digital signal processing hardware. The analog circuitry (operational amplifier, potentiometer, power supply) is straightforward and can be implemented on a single circuit board, providing realism without excessive complexity.
4Reliability
If compression mechanism adjusts potentiometer impedance, then realistic impedance correlation is achieved, but the device complexity and ease of operation are affected
Solution Approach 1:
The system merges the ECG signal generation and impedance variation into a single unified mechanism. The compression mechanism simultaneously controls both the mechanical compression of the potentiometer (affecting impedance) and the signal amplification, ensuring they remain naturally correlated without requiring separate controls.
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 produces realistic CPR-corrupted ECG signals that resemble real-life situations, enhancing the accuracy of ECG analysis and defibrillation therapy, while being more versatile than digital systems and easier to implement without complex digital interfacing.
Implementation Method 1
a compression mechanism configured to adjust an impedance of the potentiometer according to the vertical force
Data Source
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Figure 3A~3B
AI summary
An electromechanical system for generating a CPR-corrupted ECG signal is provided. The electromechanical system may include an ECG signal generator electrically coupled to a first contact of an AED. The electromechanical system may further include a potentiometer electrically coupled to the ECG signal generator and a second contact of the AED. The electromechanical system may further include a compression mechanism. The compression mechanism may be configured to receive a vertical force and adjust an impedance of the potentiometer according to the vertical force. The compression mechanism may include a rack having a plurality of teeth and an initial position. The rack may be configured to translate to a second position according to the vertical force. The compression mechanism may further include a gear with a plurality of teeth engaged with the teeth of the rack such that the gear rotates according to the translation of the rack.