Defibrillator Automatic Mode Switching Based on Heart Rhythm
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Solution Overview
Problem
Manual defibrillators and Automated External Defibrillators (AEDs) face challenges in accurately determining the appropriate shock mode, leading to user errors and potential complications during synchronized cardioversion, as users may inadvertently switch between synchronized and asynchronous modes without proper awareness, which can exacerbate arrhythmias or fail to deliver necessary therapy.
Innovation Solution
An external defibrillator with a housing, heart rhythm detector, manual mode controller, and automatic mode controller that sets the device to synchronous or asynchronous shock mode based on user input and detected heart rhythms, automatically adjusting the mode after shock delivery without human intervention to minimize user confusion and ensure appropriate therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual mode controller is used to set defibrillator in synchronous or asynchronous shock mode based on user input, then user flexibility and control are improved, but user error and mode confusion increase
Solution Approach 1:
The defibrillator automatically determines whether to deliver synchronized or unsynchronized 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 the appropriate mode selection, thereby preventing user error while maintaining operational flexibility.
Solution Approach 2:
The system continuously monitors heart rhythm parameters and uses this feedback to automatically adjust the shock delivery mode. By analyzing real-time ECG characteristics, the defibrillator receives feedback about the patient's cardiac state and autonomously selects the appropriate synchronization mode, preventing user confusion while maintaining control adaptability.
2Reliability
If automatic mode controller is used to set defibrillator mode based on detected heart rhythm, then user error is reduced, but device complexity increases
Solution Approach 1:
The existing heart rhythm detection capability of the defibrillator is extended to perform dual functions: both traditional rhythm analysis and automatic mode selection. By making the detection system universal, the patent achieves automatic mode control without adding separate dedicated hardware, thereby reducing the impact of increased device complexity.
Solution Approach 2:
The patent combines the mode selection function with the existing heart rhythm detection and analysis system. Instead of creating a separate automatic mode control system, the functionality is merged into the existing control architecture, allowing the same detection circuits and processors to serve multiple purposes and minimizing additional complexity.
3Measurement precision
If synchronized shock mode is used during ventricular fibrillation, then therapy precision is improved, but harmful effects increase due to potential arrhythmia exacerbation
Solution Approach 1:
The defibrillator dynamically adjusts the shock delivery mode based on the detected heart rhythm characteristics. When ventricular fibrillation is detected, the system automatically switches from synchronized to unsynchronized mode, allowing the shock timing to be flexible rather than fixed, thereby preventing harmful effects while maintaining precision when appropriate.
Solution Approach 2:
The system performs preliminary analysis of the heart rhythm before shock delivery to identify conditions that would make synchronized shocking harmful. By detecting ventricular fibrillation or other contraindications in advance, the defibrillator takes preliminary anti-action by preventing synchronized shock delivery, thereby avoiding potential arrhythmia exacerbation before it can occur.
Data Source
AI summary
An external defibrillator may have a controller to set the defibrillator in a synchronous shock operating mode or an asynchronous shock operating mode, a shock module to cause the defibrillator to deliver shock therapy to a patient according to the present operating mode of the defibrillator, and a heart rhythm detector to detect a heart rhythm of the patient. The defibrillator may also have a mode assessment module to determine whether the present operating mode or selected defibrillation energy of the defibrillator is appropriate based on the detected heart rhythm of the patient.