Patent ID: 8881954

Claim:
An actuator for dispensing fluid from a cartridge, the actuator being configured to be moveable within the cartridge along the longitudinal axis of the cartridge and comprising: a first radial element configured to face the dispensing opening of the cartridge, a second radial element configured to face in the opposite direction than the first radial element and a connecting element connecting the first and the second radial element and configured to have a length along the longitudinal axis of the cartridge, wherein the connecting element comprises a length variation element configured to change the longitudinal length of the connecting element, wherein the first radial element comprises a first lock and the second radial element comprises a second lock, and wherein the locks are configured for releasably locking each of the first and the second radial element separately against movement along the longitudinal axis of the cartridge and to be activated and released by the length variation element depending on the change of the longitudinal length of the connecting element, wherein the locks comprise stopping parts which are configured to move in the radial direction of the actuator to engage the cartridge when one of the first or second radial elements is in a locked position, wherein the locks are passive locks, without active drive, triggered by the change of the longitudinal length of the connecting element.