Patent ID: 9125988
Filing Date: 2015-09-08
Classification: A61M

Abstract:
1. A medicament delivery device, comprising: a housing configured for a medicament container; a drive unit in the housing and configured for acting on a movable stopper in the medicament container for expelling a dose of medicament, wherein the drive unit includes an elongated plunger rod and a dual back-to-back force spring assembly operatively connected to the plunger rod so as to provide a symmetrical load on the plunger rod; and a lock and release mechanism operatively connected to the drive unit and configured for releasing the drive unit upon activation, wherein the lock and release mechanism includes a hold member operatively connected to the plunger rod, a rotator member operatively connected to the hold member, and a tubular actuation member linearly slidable in relation to the housing and operatively connected to the rotator member; wherein the hold member is fixedly attached to the housing and includes a generally tubular lock tube through which the plunger rod extends and two half-cylindrical seats open toward a proximal direction for housing the dual back-to-back force spring assembly; the lock tube includes a resilient lock and release device configured to interact with both the plunger rod and the rotator member; and the resilient lock and release device includes two oppositely positioned radial flexible tongues, each with a first radial inwardly directed protrusion and with a first radial outwardly directed protrusion.