Dynamic Hyperinflation Detection via Volume Difference

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Solution Overview

Problem

Current methods for detecting and quantifying intrinsic PEEP during mechanical ventilation in spontaneously breathing patients are challenging, especially when interpreting pressure measurements during spontaneous breathing.

Innovation Solution

A method and device that temporarily remove mechanical ventilation during a breath, measure and calculate the difference between inspiratory and expiratory volumes, and indicate dynamic hyperinflation using a controller, sensor, and calculator to assess lung air-trapping.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mechanical ventilation is applied to support patient breathing, then oxygenation and ventilation are improved, but dynamichyperinflation and intrinsic PEEP increase

Engineering Contradiction:

Improveventilation supportVSAvoiddynamichyperinflation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary measurement of inspiratory and expiratory volumes during a breath without mechanical ventilation, then uses this information to calculate intrinsic PEEP and detect dynamichyperinflation before the harmful effect fully develops, allowing for proactive adjustment of ventilation settings

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors ventilator parameters including inspiratory and expiratory volumes, calculates intrinsic PEEP in real-time, and provides feedback signals to alert clinicians when dynamichyperinflation is present, enabling continuous adjustment of ventilation settings to prevent worsening of the condition

Inventive Principle:

Principle #23Feedback

2Difficulty of detecting and measuring

If clinical pressure measurement methods are used to detect intrinsic PEEP, then detection capability is provided, but interpretation difficulty increases during spontaneous breathing

Engineering Contradiction:

Improveintrinsic PEEP detectionVSAvoidinterpretation during spontaneous breathing

Core Design Contradiction:

Difficulty of detecting and measuringVSEase of operation

Solution Approach 1:

The system replaces complex mechanical pressure measurement and interpretation methods with a simpler volumetric measurement approach. By measuring inspiratory and expiratory volumes during spontaneous breathing and calculating the difference, the system eliminates the need for complex pressure occlusion maneuvers while providing accurate detection of intrinsic PEEP and dynamichyperinflation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS9308338B2Detection of dynamic hyperinflation in spontaneously breathing mechanically ventilated patients

Publication Date: 2016.04.12 ST MICHAELS HOSPITAL

AI summary

A method and device for determining dynamic hyperinflation during mechanical ventilation of a spontaneously breathing patient, wherein mechanical ventilation is removed during one breath of the patient, inspiratory and expiratory volumes of the patient are measured during the one breath, and a difference between the inspiratory and expiratory volumes measured during the one breath is calculated. Dynamic hyperinflation of the patient's lungs is indicated in relation to the calculated difference.