Cuff Pressure Management Device Using Compliance Analysis

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Solution Overview

Problem

Current cuff pressure management systems for tracheal breathing tubes are inefficient in maintaining optimal cuff pressure, leading to inconsistent seals and potential tracheal wall damage due to overinflation, and are not adaptable to individual patient anatomical variations.

Innovation Solution

A cuff pressure management device with a volume displacement subsystem, pressure transducer, and compliance determination circuit that automatically identifies and maintains the optimal cuff pressure by analyzing compliance changes as the cuff inflates through different anatomical structures of the tracheal airway, using a three-phase compliance calculation to determine the ideal pressure range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual cuff pressure management methods (MOV, MLT, CPM, palpation) are used, then cuff pressure can be adjusted, but inconsistency and subjectivity lead to unreliable seal quality and frequent tracheal wall damage

Engineering Contradiction:

Improvecuff seal consistencyVSAvoidcuff pressure management complexity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The cuff management system performs self-assessment by automatically measuring cuff compliance and analyzing the relationship between cuff volume and pressure to determine optimal pressure settings without requiring continuous clinician intervention or subjective manual assessment

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system continuously monitors cuff compliance and provides real-time feedback to automatically adjust cuff pressure, creating a closed-loop control system that maintains optimal seal quality while preventing tracheal wall damage

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If fixed pressure ranges (20-30 cm H2O) are maintained using conventional CPM, then a standard seal is achieved, but individual patient anatomical variations are not accommodated leading to suboptimal ventilation

Engineering Contradiction:

Improveadaptability to patient anatomyVSAvoidcuff pressure measurement accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The system tailors cuff pressure management to each patient's specific tracheal anatomy by measuring local compliance characteristics and determining individualized optimal pressure ranges, rather than applying a universal fixed pressure standard

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically adjusts cuff pressure parameters based on measured compliance values and the relationship between cuff volume and pressure, transforming from static fixed-pressure management to dynamic parameter-adaptive management

Inventive Principle:

Principle #35Parameter changes

3Reliability

If cuff pressure is increased to ensure adequate seal, then air leak is prevented, but tracheal wall damage occurs due to overinflation and compromised blood flow

Engineering Contradiction:

Improveseal effectivenessVSAvoidtracheal wall damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system continuously monitors cuff compliance and maintains optimal cuff pressure throughout the ventilation process, ensuring continuous effective sealing while preventing the harmful effects of overinflation that occur with intermittent or static pressure management

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The system transitions from static fixed-pressure management to dynamic pressure adjustment based on real-time compliance measurements, allowing the cuff pressure to adapt continuously to changing patient needs while maintaining safety margins

Inventive Principle:

Principle #15Dynamics

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 system ensures an optimal cuff seal pressure is maintained, reducing tracheal wall damage and adapting to individual patient anatomy, providing consistent and effective ventilation across various patient types and airway diameters.

Implementation Method 1

a pressure transducer to provide a gas pressure signal

Methodology Applied

Scientific EffectPressure sensing:

Implementation Method 2

a compliance determination circuit to calculate a compliance change based on the gas volume signal and the gas pressure signal

Methodology Applied

Scientific EffectCompliance calculation:

Data Source

PatentUS11623057B2Cuff pressure management device, a ventilator system and method of cuff pressure management

Publication Date: 2023.04.11 KONINKLIJKE PHILIPS NV

AI summary

A cuff pressure management device (10) for a tracheal breathing tube (54) with an inflatable cuff (90), comprises a volume displacement subsystem (36), a pressure transducer (44), a compliance determination circuit (34), and a cuff pressure controller (24). The volume displacement subsystem provides (i) a measured volume of pressurized gas to and from the cuff and (ii) a cuff gas volume signal. The pressure transducer provides a cuff gas pressure signal. The compliance determination circuit is configured to calculate cuff compliance and an estimated tracheal airway compliance based on the gas volume signal and the gas pressure signal. The cuff pressure controller is in controlling communication with the volume displacement subsystem and the compliance determination circuit to maintain cuff pressure based on the calculated cuff compliance.