An overhead arm assembly for a patient support apparatus includes a user interface device. The user interface device has a support structure for supporting a personal digital assistant and a charging port for personal digital assistant.

A supply system (1) and process supply a medical device with a fluid. A fluid supply port (3, 4, 5) of a supply unit (2) provides a fluid. An actuating unit (6a, 6b) detects an actuation of an actuating element (7a, 7b) and generates a message containing actuation information, which identifies the actuation. The message is transmitted via a wireless data connection (Dv) from a transmitter (8) of the actuating unit (6a, 6b) to a receiver (9) of the supply unit (2). The supply unit (2) changes a parameter of the fluid supply port (3, 4, 5), which influences the provision of fluid, in response to the reception of this message.

A supply system (1) and process supply a medical device with a fluid. A fluid supply port (3, 4, 5) of a supply unit (2) provides a fluid. An actuating unit (6a, 6b) detects an actuation of an actuating element (7a, 7b) and generates a message containing actuation information, which identifies the actuation. The message is transmitted via a wireless data connection (Dv) from a transmitter (8) of the actuating unit (6a, 6b) to a receiver (9) of the supply unit (2). The supply unit (2) changes a parameter of the fluid supply port (3, 4, 5), which influences the provision of fluid, in response to the reception of this message.