The invention relates to a piston (5) for a medical hollow body (1), particularly a syringe or a carpule, comprising at least one sliding surface (19) for contact with the hollow body (1). The piston (5) is characterized by at least one receiving area (21), in which a lubricant can be received, and by at least one dispensing means for dispensing the at least one lubricant from the at least one receiving area (21) to the at least one sliding surface (19).
