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RespiraWorks / Ventilator

Fully-featured ICU ventilator design, optimized for manufacture using commonly available components and free to license. Repository tracks all mechanical, electrical and systems design, software, requirements and regulatory documentation.
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Evaluate need for relative humidity sensor in humidifier #706

Open neelfirst opened 4 years ago

neelfirst commented 4 years ago

Can we get away without one and just do open loop control on the humidifier?

or do we need to target a specific RH?

What is the tolerance on the RH?

Possible sensor: https://www.sparkfun.com/products/9569

esc-works commented 4 years ago

Had a discussion with Dr. Hara last night which led me to believe that no we did not. Basically he said its an on-off component and they don't try to control humidity. However, we may need this as part of flow sensing, if the humidity appreciably changes the exhale gas density and thus measured flow rate.

neelfirst commented 4 years ago

We can create a separate ticket for including RH sensing as part of flow.

martukas commented 3 years ago

It appears that this was not superseded by another ticket and we still lack formal evaluation of this question.

casa-code commented 2 years ago

Given that humidity changes throughout the day, depending on the weather and the environment they are in, we would want the patient to be comfortable with the air they breathe in. I think we do need a controller. I believe tolerances would be need to be in within 1C of the corresponding RH change based on the research I just did. honeywell-sensing-sensors-ventilators-application-note-009041-11-en.pdf WHITE-PAPER-Relative-Humidity-Sensor-Behavior-and-Care.pdf