Anesthesia Circuit Leak Detection via Flow Comparison

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Solution Overview

Problem

Anesthesia systems face challenges in detecting leaks, particularly during the assembly and disassembly of re-breathing circuits, as traditional methods are not sensitive enough and can lead to inadequate ventilation or failure to detect leaks until they become significant, risking patient safety.

Innovation Solution

A method and arrangement that utilize flow sensors to measure ventilator and fresh gas flows during inspiration and expiration, allowing for the determination of gas volumes added and removed, and comparing these volumes to detect leaks, ensuring the anesthesia system's integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If bellows-based visualization is used to detect circuit leaks, then leak detection is provided, but the detection sensitivity is insufficient because the leak must be larger than the fresh gas flow rate

Engineering Contradiction:

Improveleak detection sensitivityVSAvoidpatient ventilation safety

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent replaces the mechanical bellows-based leak visualization system with an electronic flow sensing and computational detection system. Flow sensors measure inspiratory and expiratory gas flows, and a processor compares these measurements to detect leaks, providing much higher sensitivity than the mechanical bellows approach.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces flow sensors as intermediary measurement devices between the breathing circuit and the detection system. These sensors convert gas flow into electrical signals that can be processed and compared to detect leaks, serving as an intermediary that enables precise measurement without relying on mechanical visualization.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If fresh gas flow is increased to compensate for leaks, then patient ventilation is maintained, but the bellows does not rise to full extent and leak indication is lost

Engineering Contradiction:

Improvepatient ventilation maintenanceVSAvoidleak indication visibility

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent implements a feedback system where flow sensors continuously monitor inspiratory and expiratory flows, and the processor provides real-time leak detection feedback. This electronic feedback mechanism replaces the visual bellows indication, allowing the system to maintain ventilation while continuously providing leak information through electronic signals rather than mechanical displacement.

Inventive Principle:

Principle #23Feedback

3Reliability

If pre-use leak test is performed, then initial circuit tightness is verified, but leaks occurring during operation due to disconnections or sealing loss are not revealed

Engineering Contradiction:

Improveinitial circuit integrityVSAvoidcontinuous leak detection capability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent enables continuous leak detection throughout the entire anesthesia procedure by maintaining active flow measurement and comparison. Unlike the one-time pre-use test, the system continuously monitors gas flows and detects leaks in real-time, providing uninterrupted surveillance of circuit integrity from setup through patient disconnection.

Inventive Principle:

Principle #20Continuity of useful action

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

This approach provides a more sensitive and reliable detection of leaks, independent of fresh gas flow rates, ensuring patient safety by identifying leaks before they compromise ventilation, even in situations where the bellows-based system may not visualize the issue.

Implementation Method 1

measuring the ventilator gas flow added for an inspiration and removed for an expiration... measuring the fresh gas flow added for the respiration

Methodology Applied

Scientific EffectFlow measurement:

Data Source

PatentUS8333191B2Method and arrangement for detecting a leak in anesthesia system

Publication Date: 2012.12.18 GE PRECISION HEALTHCARE LLC

AI summary

A method and arrangement for detecting a leak in an anesthesia system. The method includes controlling respiratory movements by means of ventilator gas flows and measuring the ventilator gas flow added for an inspiration and removed for an expiration. The method also includes supplying a fresh gas flow for a respiration and measuring the fresh gas flow added for the respiration. The method further includes receiving information indicative of the measured gas flows, determining based on said received information both the gas volume added and the gas volume removed and comparing these determined gas volumes to each other. The method also includes determining based on comparing the anesthesia system leakage.