You may want to take into consideration that using a TDD may take longer than having someone else make a fast call for you or than making a quick dash down the hall. Another way for hospital communication is a text pager. That way your teammates or hospital staff will be able to leave messages with an operator who will transcribe them into a digital read-out on your pager. You also can type short email messages on its built-in miniature keyboard. They may listen for you and interpret what is being said, and you may respond directly into the phone headset if you communicate orally.
Some hospitals use overhead paging systems.
Obviously this may not work for the student with a hearing loss. A possible solution is to use a vibrating pager and have people page you directly. Set up a code beforehand and explain it to the front desk, hospital staff, and to the members of your team. Most commonly, the operator will take a message and transcribe it into a digital read-out on your pager. It will vibrate each time it receives an email message.