Ventilator Chest Compression Absence Detection

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Solution Overview

Problem

During cardiac massage on a ventilated patient, it is challenging for rescuers to accurately quantify the total time without chest compressions, as interruptions are frequent and difficult to track, leading to potential loss of survival chances.

Innovation Solution

A respiratory assistance device equipped with gas flow measurement means, signal processing, counting, and memory components to measure and record the duration of thoracic contractions, enabling the calculation of total time without chest compressions by summing individual cessation durations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If rescuers perform multiple interruptions for intubation, defibrillator rhythm analysis, and patient movement during cardiac massage, then necessary medical procedures can be carried out, but the total time without chest compressions increases and survival chances are reduced

Engineering Contradiction:

Improveability to perform necessary medical proceduresVSAvoidtotal time without chest compressions

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The device pre-alerts the rescuer when interruptions are approaching problematic duration thresholds, enabling them to perform necessary procedures more efficiently and return to compressions sooner, thus minimizing the net loss of compression time

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The device provides real-time feedback on cumulative interruption time through visual and acoustic alerts, allowing the rescuer to monitor and adjust their actions to keep interruptions within acceptable limits for optimal survival outcomes

Inventive Principle:

Principle #23Feedback

2Loss of information

If rescuers manually track interruption durations during cardiac massage, then awareness of no-flow time can be achieved, but the cognitive load increases and accurate tracking becomes difficult

Engineering Contradiction:

Improveawareness of no-flow timeVSAvoidcognitive load for tracking

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The device automatically performs the tracking function without requiring rescuer intervention or cognitive effort, using sensors and processors to monitor and calculate interruption durations, thereby eliminating the cognitive load while providing continuous awareness

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The manual cognitive tracking process is replaced by an automated electronic system comprising sensors, processors, and display interfaces that continuously monitor compression status and calculate no-flow time, transferring the function from human cognition to machine automation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If the device continuously monitors gas flow parameters to detect chest compression cessation, then accurate measurement of no-CT duration is achieved, but the device complexity and measurement requirements increase

Engineering Contradiction:

Improveaccuracy of no-CT duration measurementVSAvoidmeasurement and processing system

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The device uses the existing gas flow measurement system, originally designed for ventilation monitoring, to also detect chest compression status, thereby achieving accurate no-CT measurement without adding separate specialized sensors or measurement systems

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The device combines multiple functions into a single integrated system: ventilation delivery, gas flow monitoring, compression detection, interruption timing, and alert generation all occur within one unified apparatus, reducing overall system complexity despite the multiple functions performed

Inventive Principle:

Principle #5Merging (Combining)

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

The device accurately determines and displays the total time without chest compressions, aiding rescuers in minimizing interruptions and optimizing cardiac output, thereby improving survival chances.

Implementation Method 1

a gas flow sensor, characterized in that it comprises counting means for counting the durations of cessation or absence of thoracic contractions

Methodology Applied

Scientific EffectGas flow measurement:

Implementation Method 2

a pressure sensor or a gas flow sensor, characterized in that it comprises counting means for counting the durations of cessation or absence of thoracic contractions

Methodology Applied

Scientific EffectPressure measurement:

Data Source

PatentEP3218036B1Apparatus for artificial ventilation, with monitoring for absence of chest contractions

Publication Date: 2018.12.05 AIR LIQUIDE MEDICAL

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AI summary

A respiratory assistance apparatus (1) for delivering a flow of gas to a patient (P) comprises a gas delivery conduit (2) for conveying a flow of gas, measuring means (6) designed to measure at least one parameter representative of the flow of gas and to supply at least one signal corresponding to said parameter, signal-processing means (8) designed to process said signal coming from the measuring means and to deduce from said signal at least one item of information relating to performaace and/or discontinued performance of chest contractions (CT), calculating means designed to calculate at least one duration of discontinuation or absence of chest contractions (tNCT), and storage means (12) configured to register said duration of discontinuation or absence of chest contractions.