| 摘要 |
A control unit for indicating the status of a procedure is provided with a first indicator for indicating that the start of the procedure is imminent, a second indicator for indicating that the procedure has commenced, and a third indicator for indicating that the procedure is complete. A controller is provided to ensure that only one of the second and third indicators is energized after the procedure has been commenced and that neither indicator is energized until the procedure has commenced. Remote indicator units having their own sets of first, second and third indicators that operate in slaved configuration with the first, second and third indicators may also be provided. When used in connection with a treatment room, the first indicator also indicates that the room is occupied.
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