Rapid design of the pneumotachograph flow sensor CoroQuant for emergency ventilator CoroVent used during Covid-19 pandemic

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21460%2F22%3A00359911" target="_blank" >RIV/68407700:21460/22:00359911 - isvavai.cz</a>

Result on the web

<a href="http://poseidon2.feld.cvut.cz/conf/poster/proceedings/POSTER_2022.pdf" target="_blank" >http://poseidon2.feld.cvut.cz/conf/poster/proceedings/POSTER_2022.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Rapid design of the pneumotachograph flow sensor CoroQuant for emergency ventilator CoroVent used during Covid-19 pandemic

Original language description

Pneumotachograph flow sensors are commonly used in respiratory care for tidal volume measurements. CoroQuant is the pneumotachograph flow sensor designed at our faculty together with the CoroVent emergency lung ventilator in Covid-19 pandemic. During design of the computer model, the real sensor was manufactured using 3D print as the best rapid prototyping method currently available. For manufacturing of the CoroQuant flow sensors for use in the hospitals the injection molding method was chosen. During tests of the CoroQuant flow sensor it was found that accuracy of tidal volume measurement can be affected by bad design or wrong set of ventilation mixture parameters. When CoroQuant flow sensor was placed near elbow connector, measured tidal volumes were inaccurate by approximately 50 ml. The elbow connector caused wrong shape of velocity profile inside the sensor. For eliminating the Coanda effect a CoroQuant sensor was redesigned. Accuracy of new design is not affected by other parts of breathing circuit anymore. Except for the configuration of the breathing circuit, the change of temperature and humidity can also change the accuracy of tidal volume measurement. When temperature of humidified gas increases from 23 °C to 35 °C the inaccuracy of the volume measurement reaches as much as 15 %. So, there are the correction factors which encounter conversion between measured tidal volumes of gases with different temperature and humidity. Because the measurement of the flow and tidal volume is less precise than the measurement of pressure, the international standard about safety and performance of critical care ventilators requires quite loose accuracy. It means that manufacturers can make a pneumotachograph with sufficient accuracy which can hide the inaccuracies caused by small temperature and humidity changes.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20601 - Medical engineering

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of the International Student Scientific Conference Poster – 26/2022

ISBN

978-80-01-06992-9

ISSN

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e-ISSN

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Number of pages

4

Pages from-to

48-51

Publisher name

Fakulta elektrotechnická

Place of publication

Praha

Event location

Praha

Event date

May 12, 2022

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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