Patient transport apparatus with articulable powered litter

A patient transport apparatus for supporting a patient, the patient transport apparatus comprising:

• a base having a head end and a foot end, the base including:
• a base frame arranged for movement about a ground surface,
• an intermediate frame operatively coupled to the base frame and defining an intermediate rail extending between the foot end and the head end, the intermediate frame including an auxiliary guide arranged below the intermediate rail, and
• a trolley configured to translate along the intermediate rail between a plurality of trolley positions including a trolley forward position where the trolley is arranged at the head end of the base and a trolley docking position where the trolley is arranged at the foot end of the base;
• and
• a litter configured to be docked to and undocked from the trolley such that, when docked to the trolley, the litter is supported by the trolley and is configured to slidably translate relative to the intermediate frame between a plurality of litter positions including a litter forward position, where the trolley is in the trolley forward position, and a cantilevered position, where the trolley is in the trolley docking position such that litter is cantilevered off the foot end of the base, the litter including:
• a patient support surface for supporting the patient, and
• an auxiliary roller assembly coupled to and extending from the litter and arranged for engagement with the auxiliary guide to provide an auxiliary point of contact to support the litter when the litter is docked to the trolley and the trolley is in the trolley forward position.