Defibrillator Sync Mode Automatic Shock Timing
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Solution Overview
Problem
Manual defibrillators often suffer from user error in switching between synchronized and asynchronous shock modes, leading to potential misdelivery of shocks during cardiac emergencies, which can exacerbate ventricular fibrillation or fail to provide necessary therapy.
Innovation Solution
An external defibrillator with a housing, heart rhythm detector, manual mode controller, and automatic mode controller that allows manual selection of shock mode and automatically adjusts the mode based on detected heart rhythms post-shock delivery, reducing user confusion and ensuring appropriate timing of subsequent shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual mode selection is used for switching between synchronized and asynchronous shock modes, then user control over shock delivery is improved, but user error and misdelivery of shocks increase
Solution Approach 1:
The defibrillator automatically determines whether to deliver synchronized or asynchronous shocks based on detected heart rhythm characteristics, eliminating the need for manual user selection. The device serves itself by autonomously analyzing the ECG signal and making mode decisions, thereby preventing user error while maintaining operational control.
Solution Approach 2:
The system continuously monitors heart rhythm parameters and uses this feedback to dynamically adjust the shock delivery mode. By detecting features such as QRS complex morphology and timing, the device receives real-time feedback about the patient's cardiac state and automatically selects the appropriate mode, ensuring reliable shock delivery without manual intervention.
2Reliability
If automatic mode selection is implemented based on detected heart rhythm, then user error is reduced, but device complexity increases
Solution Approach 1:
The defibrillator performs preliminary analysis of the heart rhythm characteristics before shock delivery to pre-determine the appropriate mode. By evaluating ECG features in advance and setting the mode accordingly, the system avoids the need for complex real-time decision-making during critical moments, reducing operational complexity while maintaining high reliability.
Solution Approach 2:
The system changes operational parameters (synchronized vs. asynchronous mode) based on detected heart rhythm parameters. By monitoring specific ECG features such as QRS duration, amplitude, and morphology, the device automatically adjusts its delivery mode in response to parameter changes in the patient's cardiac state, achieving reliable automation without excessive complexity.
3Measurement precision
If synchronized shock mode is used, then shock timing precision is improved, but risk of exacerbating ventricular fibrillation increases when incorrectly applied
Solution Approach 1:
The defibrillator performs preliminary detection and analysis of the heart rhythm to determine whether synchronized mode is appropriate before delivering the shock. By pre-assessing the cardiac state and identifying suitable synchronization points in the ECG cycle, the system ensures that synchronized shocks are only delivered when safe, preventing the exacerbation of ventricular fibrillation while maintaining timing precision when applicable.
Solution Approach 2:
The system continuously monitors ECG parameters and uses this feedback to determine the safety of synchronized shock delivery. By detecting real-time heart rhythm characteristics and comparing them against safety criteria, the device receives feedback that prevents synchronized shocks from being delivered when the patient's condition would be worsened, thereby eliminating the harmful effect while preserving the benefit of precise timing when appropriate.
Data Source
AI summary
An external defibrillator, such as a wearable defibrillator can have a heart rhythm detector to detect the heart rhythm of a patient. The defibrillator can also have a synchronous shock operating mode and an asynchronous shock operating mode. A controller can set the defibrillator in the synchronous shock operating mode or the asynchronous shock operating mode. The defibrillator can also include a shock module to cause the defibrillator to deliver shock therapy to the patient according to the operating mode of the defibrillator and a sync module configured to identify a first portion of the heart rhythm detected from a first ECG lead with which to time the delivery of the shock therapy to the patient when the operating mode of the defibrillator is in synchronous shock operating mode. A comparator module can compare timing of a QRS complex detected from the first ECG lead with the timing of the QRS complex detected by the second EGG lead.