AED Single Shock Protocol Extending CPR Time
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Solution Overview
Problem
Automatic external defibrillators (AEDs) often allocate insufficient time for cardiopulmonary resuscitation (CPR) relative to defibrillation activities, which can reduce the chances of successful resuscitation, especially in patients with prolonged cardiac arrest.
Innovation Solution
An AED is designed to increase the proportion of CPR time by delivering a single biphasic shock of at least 150 Joules and then entering a CPR pause period, allowing for extended CPR administration, with the option to switch between single and multiple shock protocols without removing the battery or using specialized hardware/software.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AED delivers multiple shocks in sequence to treat ventricular fibrillation, then the defibrillation effectiveness is improved, but the time available for CPR administration is reduced
Solution Approach 1:
The AED dynamically adapts the shock protocol based on the duration of cardiac arrest. For shorter arrest durations, it delivers multiple shocks in sequence. For prolonged arrest durations, it switches to a single shock followed by extended CPR, optimizing the balance between defibrillation effectiveness and CPR time based on real-time assessment of the patient's condition.
Solution Approach 2:
The system changes the protocol parameters (number of shocks, interval between shocks, CPR timing) based on the assessed duration of cardiac arrest. This parameter adaptation allows the AED to maximize CPR time when the heart has been arrested for a prolonged period, while maintaining adequate defibrillation effectiveness.
2Reliability
If the AED follows traditional multiple-shock protocols, then defibrillation coverage is comprehensive, but the proportion of CPR time in the rescue protocol is reduced
Solution Approach 1:
The AED dynamically selects between multiple-shock and single-shock protocols based on the duration of cardiac arrest. This dynamic protocol selection ensures comprehensive defibrillation coverage when needed while maximizing CPR time proportion in prolonged arrest cases, directly addressing the trade-off between defibrillation coverage and CPR time.
Solution Approach 2:
The system performs preliminary assessment of cardiac arrest duration and pre-determines the optimal protocol before initiating treatment. This preliminary action allows the AED to proactively maximize CPR time proportion in prolonged arrest cases while maintaining adequate defibrillation coverage, rather than reacting after the protocol has already reduced CPR opportunities.
3Loss of time
If the AED uses a single shock protocol with extended CPR pause, then CPR time is maximized, but the defibrillation energy delivery is reduced
Solution Approach 1:
The AED changes the shock protocol parameters based on cardiac arrest duration. When prolonged arrest is detected, it switches to a single high-energy shock followed by extended CPR pause, maximizing CPR time. The system compensates for reduced total energy delivery by concentrating it in a single high-power shock rather than distributing it across multiple lower-energy shocks.
Solution Approach 2:
The system dynamically adjusts the balance between shock delivery and CPR pause duration based on the assessed duration of cardiac arrest. This dynamic adjustment allows the AED to maximize CPR time in prolonged arrest cases while maintaining adequate defibrillation energy delivery through optimized single-shock parameters.
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
This approach enhances the chances of successful resuscitation by maximizing CPR time relative to shock administration, improving long-term survivability by optimizing the rescue protocol based on the duration of cardiac arrest.
Implementation Method 1
Automatic external defibrillators deliver a high-voltage impulse to the heart in order to restore normal rhythm and contractile function in patients who are experiencing arrhythmia
Implementation Method 2
AEDs are pre-programmed to automatically analyze the electrocardiogram rhythm to determine if defibrillation is necessary
Data Source
AI summary
An automated external defibrillator (AED) is described which spends an increased proportion of a rescue in a CPR mode. This is accomplished by use of a single shock protocol which causes the AED to spend less time in shock analysis and delivery activities as compared with the typical multiple shock protocol. An AED of the present invention preferably is configured such that the rescue protocol can be modified or changed easily without the need to remove the battery or use specialized hardware or software. Preferably the shock waveform of the single shock is a biphasic waveform delivering at least 150 Joules of energy and more preferably at least 200 Joules of energy.