Cannula for oral and nasal oxygen supply and capnography

The cannula design addresses the challenge of accurately measuring exhaled CO2 during oxygen delivery by isolating oxygen delivery from CO2 sampling, enabling effective capnography and oxygenation even at higher flow rates.

WO2025074368A1 Publication Date: 2025-04-10ORIDION MEDICAL 1987
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Patent Information

Application Number
PCT/IL2024/050977
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-09-09
Filing Date
2024-10-02
Publication Date
2025-04-10

AI Technical Summary

Technical Problem

Existing nasal cannulas face challenges in accurately measuring exhaled CO2 while delivering oxygen, especially at higher flow rates, due to mixing of oxygen with exhaled breath, which dilutes the gas composition and prevents accurate measurements.

Method used

The development of a cannula that includes an oxygen delivery conduit and an exhalation conduit, with nasal and oral prongs and a scoop design that isolates oxygen delivery from CO2 sampling, allowing for accurate measurement of exhaled CO2 during oxygen delivery.

Benefits of technology

This solution enables accurate capnography measurements while providing adequate oxygenation, even at higher oxygen flow rates, by ensuring that oxygen and exhaled CO2 do not mix, thus improving the accuracy and reliability of respiratory monitoring.

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Abstract

A cannula for exhaled gas monitoring and oxygen delivery includes an oxygen delivery conduit entering the cannula and an exhalation conduit exiting the cannula. The cannula further includes first and second nasal prongs each comprising a channel directing exhaled nasal breath into the exhalation conduit, an oral scoop forming a cavity that is fluidly coupled to the exhalation conduit, and first and second ports fluidly coupled to the oxygen delivery conduit and opening toward the oral scoop.
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