The invention relates to a pump, in particular a blood pump. The pump comprises a drive shaft (3) extending in an axial direction, an impeller (6) connected to the drive shaft (3) in a distal region of same, and a housing (5) surrounding the impeller (6). The impeller (6) and the housing (5) are embodied such that they self-deploy following a forced compression. Furthermore, the housing (5) comprises an inlet region (22) with at least one inlet (23), a liquid-tight region (20) surrounding a region of the impeller (6), and an outlet region (24) with at least one opening (25) for the outflow of a pump medium. The impeller (6) is arranged such that it protrudes into the outlet region (24).
