This application is a pump, more particularly to a blood pump. The pump has a drive shaft extending in the axial direction (3), and connected to delivery element (6) to the drive shaft at a distal region of the drive shaft (3) (3), a housing surrounding the delivery element (6) (5) and a. Delivery element (6) and the housing (5) is designed to automatically deploy after being forcibly compressed. Housing (5) further includes an inlet region (22) comprising at least one inlet opening (23), a liquid-tight region surrounding a region of the delivery element (6) (20), the outlet of the pump medium and an outlet region with at least one opening (25) (24). Delivery element (6) is arranged so as to protrude into the outlet region (24).