Patent ID: 8551054
Filing Date: 2013-10-08
Classification: A61M

Abstract:
1. A damper for a medicament delivery device that includes a container containing medicament, a stopper arranged in the container and movable for expelling the medicament through a dose delivery device, a plunger rod acting on the stopper, and a force device configured for exerting a force on the plunger rod, the damper comprising: a tubular sleeve having opposing proximal and distal ends and comprising a compartment formed by a closed end wall at the proximal end of the tubular sleeve and a proximal end of the plunger rod which is positioned in an open end at the distal end of the tubular sleeve; a high-viscosity fluid arranged inside the compartment; at least one passage formed between the compartment and an annular space between the plunger rod and an inner wall of the container; and a resilient and sealable pad positioned in the compartment and arranged to cover the at least one passage when the resilient and sealable pad is in a released position, wherein when the force device is activated for exerting a force applied on the compartment by the plunger rod for expelling medicament, the resilient pad is compressed such that the at least one passage is freed, expelling the high-viscosity fluid into the annular space between the plunger rod and the inner wall of the container, thereby creating a dampening force.