PISTON FOR AN EMPLOYEE OF MEDICAL PURPOSE AND AN EMPTY EMPLOYMENT OF MEDICAL PURPOSE

摘要

1. A piston for a hollow object (1) for medical purposes, in particular a syringe or karpula, which has at least one sliding surface (19) for adhering to a hollow object (1), characterized in that it contains: at least one a receiving region (21) in which antifriction means can be placed, and at least one releasing means for releasing at least one antifriction means from at least one receiving region (21) onto at least one sliding surface (19). 2. A piston according to claim 1, characterized in that the antifriction means cannot be discharged from the first piston state (5) from the at least one receiving region (21), and the antifriction means can be discharged from the second piston state (5) using at least one means for at least one sliding surface (19). 3. A piston according to claim 2, characterized in that the piston (5) is not under pressure in the first state, but under pressure in the second state. A piston according to claim 1, characterized in that at least one receiving region (21) contains at least one reservoir (67), a sponge (85, 85 '), a microballoon and / or a region with microspheres embedded in it. A piston according to claim 4, characterized in that the sponge (85, 85 ') is ring-shaped and covers the outer side surface (17) of the piston (5) in at least separate areas. A piston according to claim 1, characterized in that at least one outlet means is provided with at least one channel (25), which leads from at least one receiving region (21) to at least one sliding surface (19), this, antifriction agent can flow in channel (25). 7. A piston according to claim 2 or 6, characterized in that at least