Ventilatory Assist Control Using Diaphragmatic Electrical Activity

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Solution Overview

Problem

Current methods for determining the optimal level of ventilatory assist for ventilator-dependent patients are empirical and do not effectively prevent respiratory muscle fatigue, as they fail to account for individual variations in muscle activation and neuromechanical coupling, leading to inefficient breathing patterns and potential muscle exhaustion.

Innovation Solution

A method and device that calculate a critical threshold of respiration-related features, such as diaphragmatic electrical activity and pressure-time product, to adjust ventilatory assist levels, preventing muscle fatigue by monitoring and controlling these parameters to maintain optimal muscle activation and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If empirical methods are used to set ventilatory assist levels, then the setting process is simple, but respiratory muscle fatigue cannot be effectively prevented

Engineering Contradiction:

Improvesimplicity of ventilatory assist settingVSAvoideffectiveness in preventing respiratory muscle fatigue

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system continuously monitors diaphragmatic electrical activity (EAdi) and provides real-time feedback to adjust ventilatory assist levels. The controller automatically modifies ventilation parameters based on detected changes in EAdi, creating a closed-loop control system that prevents muscle fatigue while maintaining adequate ventilation support.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The ventilatory support system automatically adjusts its own parameters based on patient response. By monitoring the patient's diaphragmatic electrical activity, the system self-regulates the level of assist provided, eliminating the need for continuous manual intervention while adapting to the patient's changing respiratory needs.

Inventive Principle:

Principle #25Self-service

2Device complexity

If fixed ventilatory assist levels are applied, then the device complexity is low, but individual variations in muscle activation cannot be accounted for

Engineering Contradiction:

Improvesimplicity of ventilatory support systemVSAvoidability to account for individual muscle activation variations

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The ventilatory assist level transitions from a fixed parameter to a dynamic one that automatically adjusts based on real-time monitoring of diaphragmatic electrical activity. The system continuously adapts the support level to match the patient's instantaneous respiratory muscle activation patterns, providing personalized ventilation support without requiring complex manual programming.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the ventilatory assist parameter (pressure support level) based on detected changes in the physiological parameter (diaphragmatic electrical activity). By monitoring EAdi and automatically adjusting the ventilatory support parameter accordingly, the system adapts to individual patient variations in muscle activation while maintaining system simplicity.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If higher ventilatory assist levels are provided, then pulmonary ventilation is adequate, but respiratory muscle function deteriorates due to unloading

Engineering Contradiction:

Improveadequacy of pulmonary ventilationVSAvoidinspiratory muscle function

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The system uses real-time feedback from diaphragmatic electrical activity monitoring to dynamically adjust ventilatory assist levels. When EAdi indicates adequate muscle function, the system provides sufficient ventilation support; when EAdi shows signs of fatigue, the system automatically reduces assist levels to maintain appropriate muscle loading, thus preserving muscle function while ensuring adequate ventilation.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

Instead of providing full ventilatory support that would completely unload the respiratory muscles, the system provides partial support that maintains adequate pulmonary ventilation while preserving a sufficient loading stimulus for the inspiratory muscles. This partial action approach prevents both ventilation inadequacy and muscle atrophy.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS8256419B2Method and device using myoelectrical activity for optimizing a patient's ventilatory assist

Publication Date: 2012.09.04 MAQUET CRITICAL CARE

AI summary

The present invention relates to a method and device for determining a level of ventilatory assist to a ventilator-dependent patient, in which a critical threshold of a respiration-related feature is calculated. Fatigue of a respiratory muscle of the ventilator-dependent patient develops when the critical threshold is reached by the respiration-related feature. The level of ventilatory assist to the ventilator-dependent patient is controlled in relation to the critical threshold of the respiration-related feature so as to prevent fatigue of the patient's respiratory muscle.