My initial reaction was to say that there is no way the RPi would be reliable enough for clinical purposes. However, from the schematics, it looks like the RPi is only used for displaying the airflow curves and not used to control the ventilating. A microcontroller is used for that critical function.

If this is the case, then this would make the reliability much better and there is a chance it could be useful to many places. If the SD card on the Pi dies (which, if they are logging the data to SD and not RAM, is a likely event), then they can have spare SDs available as part of the standard operating procedure. It's not ideal, but so long as the main microcontroller is functioning, the display could be considered non-critical. Although, ICU staff might disagree...