Defibrillator Shock Triggered by CPR Cessation

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Solution Overview

Problem

Existing defibrillators face challenges in delivering accurate defibrillation shocks during CPR due to mechanical disturbances and artifacts, leading to delayed shock delivery and potential inaccuracies in heart rhythm analysis, which can decrease the chances of survival for cardiac arrest victims.

Innovation Solution

A defibrillation system that combines ECG analysis with detection of CPR cessation to trigger shock delivery, using a mechanical disturbance detector and processor to compensate for artifacts and reduce the time interval between CPR compressions and defibrillation, enabling immediate and accurate shock administration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If CPR precordial compressions are performed on the patient, then circulation is restored artificially improving survival chances, but mechanical disturbances and artifacts corrupt the ECG signal making accurate heart rhythm analysis difficult

Engineering Contradiction:

Improvesurvival chanceVSAvoidECG signal accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent detects mechanical disturbances caused by CPR compressions and uses this information to identify and remove corresponding artifacts from the ECG signal. The harmful mechanical disturbances are converted into useful information that enables artifact compensation and improves the accuracy of heart rhythm analysis during CPR.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent introduces an intermediary processing system that separates the ECG signal from mechanical disturbance artifacts through signal processing techniques. This intermediary analysis allows the system to distinguish between true cardiac events and CPR-induced artifacts, enabling accurate rhythm detection without requiring interruption of CPR.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If the defibrillator waits for CPR to stop before analyzing heart rhythm, then signal accuracy improves, but the time interval between CPR and shock delivery increases decreasing survival chances

Engineering Contradiction:

Improveheart rhythm analysis accuracyVSAvoidtime to shock delivery

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent performs preliminary assessment of the ECG signal quality and artifact levels during ongoing CPR. By continuously monitoring signal characteristics and using real-time artifact compensation techniques, the system prepares the analysis results in advance, enabling immediate shock delivery as soon as the rhythm is determined to be shockable, without requiring waiting for CPR cessation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamic signal processing that adapts to the changing conditions during CPR. The system continuously adjusts its analysis parameters and artifact rejection techniques based on the ongoing mechanical disturbances, enabling accurate real-time rhythm assessment throughout the CPR process rather than requiring a static analysis period after CPR stops.

Inventive Principle:

Principle #15Dynamics

3Loss of time

If the defibrillator delivers shock immediately after CPR compressions, then time to treatment is reduced improving survival, but mechanical artifacts may cause inaccurate rhythm detection leading to inappropriate shock delivery

Engineering Contradiction:

Improvetime to shock deliveryVSAvoidtreatment accuracy

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The patent uses feedback from mechanical disturbance detectors and artifact analysis to continuously monitor signal quality during CPR. This feedback mechanism allows the system to distinguish between true arrhythmias and CPR-induced artifacts in real-time, providing confidence metrics that enable accurate rhythm detection and appropriate shock delivery decisions without delaying treatment.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces reliance on purely mechanical signal acquisition during CPR with a combined approach that uses signal processing algorithms and artifact compensation techniques. This substitution allows the system to overcome the limitations of mechanical ECG acquisition during chest compressions by computationally removing artifacts and extracting accurate rhythm information.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS9168385B2External defibrillator with shock activated by cessation of precordial compressions

Publication Date: 2015.10.27 EVEREST ACQUISITION ENTITY LLC

AI summary

A defibrillator having a pair of electrodes for delivering an artifact-compensated defibrillation shock and a method thereof is provided. The defibrillator can be deployed rapidly while administering a cardio-pulmonary resuscitation (CPR) on the patient. Upon detection of an end of the CPR operation, a correlation signal indicative of signal corruption is detected and analyzed rapidly to determine an appropriate energy level discharged across the pair of electrodes. Thereafter, a notification signal is sent to the user of the defibrillator prior to delivering the defibrillation shock to the patient. The artifact-compensated defibrillation shock is delivered if for a predetermined period of time no movements is detected.