Capnoxygen Mask Segmentation for CO2 Sampling

Solution Overview

Problem

Oxygen masks are often incompatible with CO2 sampling due to dilution and rebreathing issues, making it difficult to monitor CO2 levels effectively while delivering oxygen at high concentrations and flow rates.

Innovation Solution

A double-layered capnoxygen mask with a separate compartment for oxygen delivery and CO2 sampling, featuring perforations for dispersed oxygen flow and nasal prongs or traps for efficient breath sampling, reduces dilution and rebreathing, allowing for high-quality CO2 monitoring alongside oxygen delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If oxygen masks deliver high concentrations and flow rates of oxygen, then oxygen delivery effectiveness is improved, but CO2 sampling quality deteriorates due to dilution and rebreathing

Engineering Contradiction:

Improveoxygen delivery concentration and flow rateVSAvoidCO2 sampling quality

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The mask is divided into two separate compartments: an oxygen delivery compartment and a CO2 sampling compartment. The sampling compartment includes nasal prongs positioned to capture exhaled breath directly, while the oxygen compartment delivers oxygen through perforations. This segmentation prevents oxygen from diluting the CO2 sample while still providing effective oxygen therapy.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If a single compartment mask is used for both oxygen delivery and CO2 sampling, then device complexity is reduced, but CO2 sampling accuracy deteriorates due to sample dilution

Engineering Contradiction:

Improvemask structureVSAvoidCO2 concentration measurement

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The mask is divided into two separate compartments: an oxygen delivery compartment and a CO2 sampling compartment. The sampling compartment includes nasal prongs positioned to capture exhaled breath directly, while the oxygen compartment delivers oxygen through perforations. This segmentation prevents oxygen from diluting the CO2 sample while still providing effective oxygen therapy.

Inventive Principle:

Principle #1Segmentation

3Device complexity

If oxygen is delivered through the same space where breath is sampled, then device complexity is minimized, but rebreathing increases

Engineering Contradiction:

Improvecompartment structureVSAvoidrebreathing

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The mask is divided into two separate compartments: an oxygen delivery compartment and a CO2 sampling compartment. The sampling compartment includes nasal prongs positioned to capture exhaled breath directly, while the oxygen compartment delivers oxygen through perforations. This segmentation prevents oxygen from diluting the CO2 sample while still providing effective oxygen therapy.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The CO2 sampling function is extracted into a separate compartment with dedicated nasal prongs, removing it from the oxygen delivery space. This extraction eliminates the harmful interaction between oxygen flow and breath sampling, preventing rebreathing while maintaining independent optimization of both functions.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS11938273B2Capnoxygen masks

Publication Date: 2024.03.26 ORIDION MEDICAL 1987

AI summary

An oxygen mask configured for CO2 sampling and oxygen delivery, the oxygen mask having an oxygen inlet, a nasal breath-sampling element and a breath sampling port configured to receive breath samples, sampled by the breath-sampling element, wherein the breath-sampling element is configured to reduce dilution of exhaled breath by the delivered oxygen.