ISM - 2.4GHz for wireless medical device

Hi,

Is there any restriction or limitation on using 2.4GHz of ISM band for designing wireless medical device? Is it allowed to be used in the hospital and mobile vehicles such as ambulance?

There is this WMTS (Wireless Medical Telemetry Services) with 3 frequency bands but it seems that this restrict the implemented device to be used on mobile vehicles!?

Please advice.

Thanks.

Eric