Patent ID: 7947017

Claim:
An apparatus, comprising: a carrier configured to be disposed within a housing of a medical device, a first end portion of the carrier configured to be coupled to a medicament container, a second end portion of the carrier including a valve actuator, the carrier including an engagement portion configured to directly engage a retraction spring; a movable member configured to move relative to the carrier, the movable member having a first end portion and second end portion, a portion of the first end portion configured to define a portion of a boundary of a gas chamber, the first end portion defining an opening configured to be in fluid communication between the gas chamber and an area outside the gas chamber, the second end portion configured to be engaged with the medicament container; and a valve coupled to the movable member, the valve configured to allow fluid communication between the gas chamber and the area outside the gas chamber through the opening defined by the first end portion when the valve is actuated by the valve actuator of the carrier.