Patent ID: 8876783
Filing Date: 2014-11-04
Classification: A61M

Abstract:
1. A medicament delivery device, comprising: a housing; a medicament container arranged within the housing and having a front opening for a medicament dispenser for delivering a medicament therethrough and at least one movable stopper; a medicament delivery driver, comprising an elongated plunger rod having a rear end and a front end, which is in contact with the stopper, and a power source arranged to drive the plunger rod, wherein the medicament delivery driver is movable from a cocked position to a released position within the medicament container, thereby exerting a pressure on the stopper for expelling the medicament through the medicament dispenser; a manually operable release mechanism movable between a locked position, in which the manually operable release mechanism holds the medicament delivery driver in the cocked position, and an activated position, in which the manually operable release mechanism releases the medicament delivery driver; and a movement speed control mechanism, comprising at least one elongated and flexible compartment fixedly attached to the housing and containing a volume of a viscous liquid, and at least one flexible speed control member extending from the plunger rod and having a contact surface arranged with longitudinal passages; wherein the contact surface is arranged to be pressed against the at least one compartment for forcing the viscous liquid past the at least one flexible speed control member and thereby controlling movement speed of the medicament delivery driver when the medicament delivery driver is moved from the cocked position to the released position; wherein the at least one flexible speed control member extends radially outward from the plunger rod and has an inclination toward a front end of the plunger rod, such that a higher driving force produces a higher pressure from the contact surface against the flexible compartment.