Patent ID: 8505784
Filing Date: 2013-08-13
Classification: A61D

Abstract:
1. A valve operating mechanism for use in a fluid dispenser, wherein the fluid dispenser includes: a reservoir for a fluid to be delivered, and an fluid outlet for the reservoir, and a piston configured to move through the reservoir, wherein the piston includes a piston head and piston shaft, and an actuator for the piston, the valve operating mechanism comprising: a valve, wherein the valve has an upstream side and a downstream side; and the valve operating mechanism including a piston sleeve for the piston shaft, wherein the piston sleeve is linked to the actuator such that it is slidably movable relative to the piston shaft, wherein the actuator is configured to have at least two ranges of movement, wherein the first range of movement closes the valve and the second range of movement displaces the piston such that in at least one point of operation of the valve operating mechanism, the valve is inoperable as a consequence of the pressure difference between the upstream side of the valve and the downstream side of the valve.