Defibrillator Rescue Protocol for CPR Interruption and Shock Timing
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Solution Overview
Problem
Existing defibrillator systems struggle to optimize the administration of cardiopulmonary resuscitation and defibrillating shocks to maximize the chances of a successful rescue outcome for patients experiencing cardiac arrest.
Innovation Solution
A defibrillation controller and method that adaptively manage cardiopulmonary resuscitation protocols, including interruptible and uninterruptible CPR, and shock protocols to achieve a maximum number of consecutive interrupted defibrillating shock deliveries based on ECG analysis and CPR quality assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an interruptible CPR protocol is used to allow shock delivery during CPR, then the ability to deliver defibrillating shocks is improved, but the reliability of successful resuscitation deteriorates due to premature termination of CPR before optimal shock delivery timing
Solution Approach 1:
The system continuously monitors CPR quality metrics (compression depth, rate, and ECG waveform quality) and uses this feedback to dynamically determine the optimal timing for shock delivery. The controller assesses whether CPR quality has degraded below a threshold and only then terminates CPR to deliver the shock, ensuring shocks are delivered at the most effective moment while maintaining CPR continuity when possible.
Solution Approach 2:
The CPR protocol transitions from a static, predetermined interruptible approach to a dynamic adaptive protocol. The system continuously adjusts the timing and decision to interrupt or continue CPR based on real-time assessment of CPR quality, ECG waveform quality, and shock readiness status, optimizing the balance between maintaining circulation and delivering effective shocks.
2Reliability
If CPR is continued without interruption to maintain blood flow, then the reliability of resuscitation is improved, but the ability to deliver timely defibrillating shocks deteriorates due to delayed shock delivery
Solution Approach 1:
The system uses real-time feedback from CPR quality sensors and ECG analysis to determine when CPR should be interrupted for shock delivery. Rather than using fixed time intervals, the system monitors actual CPR effectiveness and shock readiness, interrupting CPR only when quality degradation or shock readiness indicators are detected, thus minimizing unnecessary delays.
Solution Approach 2:
The system prepares for potential shock delivery in advance by continuously monitoring ECG for shockable rhythms and pre-charging the defibrillator capacitor when conditions are favorable. This preliminary preparation ensures that when a shock is deemed necessary, it can be delivered immediately without waiting for capacitor charge or rhythm confirmation, reducing shock delivery delay.
3Adaptability or versatility
If multiple sequential interruptible CPR protocols are executed to allow shock deliveries, then the flexibility of rescue protocol is improved, but the reliability of successful resuscitation deteriorates due to repeated interruptions of CPR
Solution Approach 1:
The system uses cumulative feedback from multiple CPR cycles to assess overall CPR quality trends and shock delivery effectiveness. After each interrupted CPR-shock sequence, the system evaluates whether the interruption was justified by CPR quality degradation or successful shock delivery, and adjusts subsequent protocol decisions based on this learned experience, reducing unnecessary interruptions while maintaining flexibility.
Solution Approach 2:
The patent replaces the mechanical, rule-based interruptible CPR protocol with an intelligent adaptive system that uses sensor data, ECG analysis, and algorithmic decision-making to determine when interruptions are truly necessary. This substitution transforms the protocol from a rigid sequence of predetermined interruptions to a flexible, data-driven approach that maintains CPR continuity unless objectively indicated otherwise.
Data Source
AI summary
A defibrillator employing a shock delivery circuit and a defibrillation controller for controlling an administration of a cardiopulmonary resuscitation procedure on a heart of a patient by the defibrillator in accordance with a rescue protocol including an interruptible cardiopulmonary resuscitation protocol, an uninterruptible resuscitation protocol and a shock protocol. In operation, the defibrillation controller controls a series of sequential executions of the interruptible cardiopulmonary resuscitation protocol and the shock protocol in response to a preceding uninterrupted defibrillating shock delivery to the heart of the patient by the shock delivery circuit, and controls a sequential execution of the uninterruptible cardiopulmonary resuscitation protocol and the shock protocol when at least two sequential executions of the interruptible cardiopulmonary resuscitation protocol and the shock protocol results in a maximum number of consecutive interrupted defibrillating shock deliveries to the heart of the patient by the shock delivery circuit.