Defibrillation R-Wave Timing Control to Exclude T Waves
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Solution Overview
Problem
Existing intracardiac defibrillation catheter systems are unable to apply voltage for defibrillation in patients with narrow R wave intervals, risking ventricular fibrillation due to potential T wave inclusion in voltage application.
Innovation Solution
A defibrillating electrical apparatus and method that detects and excludes T waves from voltage application targets by generating enabling signals only after specific time intervals exceed predetermined thresholds, ensuring appropriate R waves are selected for defibrillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage application is enabled for all detected R waves, then defibrillation coverage is improved, but T wave misidentification causes ventricular fibrillation risk
Solution Approach 1:
The system performs preliminary analysis of time intervals between consecutive R waves before enabling voltage application. By checking whether the interval exceeds a predetermined threshold in advance, the system prevents T wave misidentification and enables safe defibrillation only when appropriate conditions are met.
Solution Approach 2:
The system continuously monitors the time intervals between detected R waves and uses this feedback to dynamically control voltage application enabling. When the interval between R waves exceeds the threshold, the system enables voltage application; otherwise, it maintains inhibition, ensuring adaptive and safe operation.
2Reliability
If voltage application is inhibited for narrow R wave intervals, then T wave misidentification is prevented, but defibrillation capability is reduced
Solution Approach 1:
The system changes the operational parameter (voltage application enabling state) based on the detected time interval parameter. When the R wave interval exceeds the predetermined threshold, the system transitions to an enabled state, allowing defibrillation. This parameter-based control ensures accurate differentiation between R waves and T waves while maintaining defibrillation capability when appropriate.
3Device complexity
If the apparatus uses simple R wave detection, then device complexity is reduced, but T wave exclusion reliability is insufficient
Solution Approach 1:
The system performs preliminary measurement of time intervals between consecutive R waves before making defibrillation decisions. This additional measurement step, while simple to implement, significantly improves the accuracy of R wave identification by providing temporal context that distinguishes R waves from T waves without complicating the overall detection mechanism.
Data Source
AI summary
The defibrillating electrical apparatus is controlled such that the enabling signal generator generates an enabling signal for the (n+1)-th R wave (Rn+1) when and after a first time interval (T1) as a time interval from the n-th R wave (Rn) to the (n+1)-th R wave (Rn+1) of an electrocardiographic waveform (50) exceeds a first predetermined time period, if the first time interval (T1) is equal to or less than the first predetermined time period, the defibrillating electrical apparatus is controlled such that the enabling signal generator generates an enabling signal for the (n+2)-th R wave (Rn+2) when and after a second time interval (T2) as a time interval from the n-th R wave (Rn) to the (n+2)-th R wave (Rn+2) of an electrocardiographic waveform (50) exceeds a second predetermined time period.