What exactly does "Hospital Grade" mean?

Thank you Albert for the detailed info.

Reading it I notice that "Hospital Grade" means it has certain characteristics, like tolerance of "Abrupt removal" (yank the wire) which are probably important in the Hospital environment, but which IMHO are not relevant to the outlets we use for audio systems. They would be a good idea for some other plugs in my house (the ones that the vacuum cleaner gets plugged into).

Albertporter...Of course a tight grip would be important for a heavy PC, but the "Hospital Grade" designation does not seem to offer this feature any better than commercial grade (as you note).

When I was involved with heavy (64-pin) connectors and cables we usually provided for strain relief support of the cables, even though the connectors were a locking type.
It seems to me that, for some of the audio equipment power cables I have seen, reliance on the simple 3-pin outlet would be unacceptable no matter how tight the grip. There are readily-available 3-pin plugs (and sockets) that twist to lock. These are, I think, used for higher amperage 220 volt applications, and I often wonder why audiophiles have not discovered them.

Covered by Medicare?

All outlets get looser as stuff is plugged in and out many times. A "pull test" is a practical way for the maintenance staff to determine how far the degradation has gone, and when it is time to replace the outlet. Wearout should not be a concern for audio applications since it does not involve frequent plug/unplug cycles.