Patient support apparatus with adaptive user interface

A patient support system for use with an ambulance, the patient support system comprising:

• a patient support apparatus for supporting a patient, the patient support apparatus including:
• a base arranged for free movement relative to the ambulance about a floor surface, the base comprising a base frame, an intermediate frame, and a base lift device connected to the base frame and the intermediate frame, the base lift device movable between a plurality of positions to move the base between a raised state and a lowered state,
• a litter defining a patient support surface to support the patient and configured for releasable attachment to the base in a docked mode, the litter including a plurality of sections defining the patient support surface to support the patient in the docked mode, with the plurality of sections being movable to support the patient in a chair configuration when the litter is separated from the base in an undocked mobility mode,
• a state detection device adapted to generate a state signal defining operation of the litter between the docked mode and the undocked mobility mode,
• a user interface positioned on the litter to generate an input signal in response to actuation by a user,
• one or more powered devices selectively operable to perform a first function associated with the litter in the docked mode, and a second function associated with the litter in the undocked mobility mode, and
• a controller coupled to the state detection device, the user interface, and the one or more powered devices, with the controller configured to receive the input signal and the state signal, and to generate an output signal based on the input signal and the state signal such that the user interface has a first functionality to operate the one or more powered devices to perform the first function upon actuation of the user interface by the user when the litter is in the docked mode and a second functionality to operate the one or more powered devices to perform the second function upon actuation of the user interface by the user when the litter is in the undocked mobility mode.