Wearable Defibrillator Dual-Mode ECG Sampling
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Solution Overview
Problem
Current wearable medical systems (WMS) for patients at risk of sudden cardiac arrest (SCA) face challenges in accurately distinguishing between shockable and non-shockable heart arrhythmias, often leading to unnecessary shocks and limited diagnostic capabilities for heart conditions.
Innovation Solution
A WMS that implements a wearable cardioverter defibrillator (WCD) with multiple ECG sensing electrodes, allowing for both regular and rich modes of operation, where the rich mode samples ECG signals more frequently and from additional channels to improve signal quality and differentiate between ventricular and atrial tachycardias, and provides 12-lead ECG diagnostics for further heart condition analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the WCD samples ECG signals at a higher rate and from additional channels (rich mode), then the diagnostic precision and ability to differentiate arrhythmias is improved, but the energy consumption and device complexity increase
Solution Approach 1:
The system dynamically switches between regular mode and rich mode based on clinical needs. The rich mode with higher sampling rates and additional channels is activated only when diagnostic precision is critical, while regular mode operates during stable periods to conserve energy.
Solution Approach 2:
The system changes operational parameters (sampling rate, number of active channels) between two distinct modes. Rich mode uses higher sampling rates and activates additional ECG channels only when needed for accurate arrhythmia differentiation, reducing average energy consumption.
2Measurement precision
If the WCD uses multiple ECG sensing channels in rich mode, then the ability to differentiate between ventricular and atrial tachycardias is improved, but the device complexity increases
Solution Approach 1:
The ECG monitoring system is segmented into multiple independent channels that can be selectively activated. During rich mode, additional channels are enabled to differentiate arrhythmia types, while during regular mode, only essential channels remain active, reducing processing complexity.
Solution Approach 2:
The same ECG sensing hardware serves multiple functions: basic rhythm monitoring in regular mode and detailed arrhythmia differentiation in rich mode. The system universally uses the available channels depending on the operational mode required.
3Loss of information
If the WCD operates in rich mode continuously, then comprehensive heart condition diagnostics are improved, but the battery life and duration of action are reduced
Solution Approach 1:
The system employs periodic switching between regular mode and rich mode rather than continuous rich mode operation. This allows comprehensive diagnostics to be performed at intervals when clinically necessary, while preserving battery life during routine monitoring periods.
Solution Approach 2:
The WCD maintains continuous monitoring capability in regular mode, ensuring uninterrupted basic protection, while rich mode is activated periodically or event-driven to gather comprehensive diagnostic information without continuously draining the battery.
Data Source
AI summary
In embodiments, a wearable medical system (“WMS”) implements a wearable cardioverter defibrillator (“WCD”) that senses and samples a patient's ECG signals. In a regular mode, the WMS produces a first set of ECG values, which can be the minimum needed for a WCD operation. In a second or rich mode of operation, the WMS produces a second set of ECG values, more numerous than the first set. The rich mode can be implemented by sampling the ECG signal faster, and/or not ignoring ECG signals in channels that are ignored in the regular mode, and/or by having more ECG sensing electrodes than the minimum needed for the WCD operation. The WMS stores the first set and the second set, and uses either one to determine whether defibrillation is needed. In addition, it communicates them to another device. In embodiments, support structures for a WMS have multiple ECG electrodes for just sensing.