You'd allow external media because you need the data off the device somehow. Unfortunately, if the monitor uses a COTS operating system (doesn't matter which),

You'd allow external media because you need the data off the device somehow. Unfortunately, if the monitor uses a COTS operating system (doesn't matter which), that's one way in for malware. Unlike their military applications, air gaps in health care settings aren't there to protect confidentiality, but availability.