Patent ID: 8591463
Filing Date: 2013-11-26
Classification: A61M

Abstract:
1. An injector device comprising: (a) an injector body including a front assembly and a rear assembly that cooperate to define an interior, the front assembly including a forward housing, a syringe carrier that is movable relative to the forward housing between a rearward position and a forward position, a first damper disposed at a rearward face of the forward housing, and a second damper disposed at a rear of the syringe carrier, wherein the syringe carrier engages the first damper when in the forward position and the syringe carrier is spaced from the first damper when in the rearward position; (b) a syringe configured to be coupled to the syringe carrier for movement therewith, the syringe including an ampoule, a needle, and a plunger, the needle extending from a first end of the ampoule, and the plunger extending from a second end of the ampoule, at least a portion of the ampoule engaging the second damper, the ampoule being configured to hold a common volume of either one of at least two different medicament formulations without modification to the injector device, a first of the two different medicament formulations having a first viscosity and a second of the two different medicament formulations having a second viscosity that is different from the first viscosity, wherein the needle is configured to extend from the injector body when the syringe carrier is disposed in the forward position and wherein the injector body includes a depth adjuster that changes a length of the needle that extends from the injector body; and (c) an injection assembly disposed within the interior of the injector body, the injection assembly being configured to dispense the medicament formulation held by the syringe, the injection assembly including a ram driven by a constant force spring, wherein releasing the constant force spring drives the syringe carrier from the rearward position to the forward position until the syringe carrier engages the first damper and wherein the constant force spring drives the plunger within the ampoule of the syringe after the syringe carrier is in the forward position; wherein the first and second dampers cooperate to inhibit breaking of the ampoule during movement of the syringe carrier and movement of the plunger.