Prefilled telescoping multiple chamber ampoule device

Abstract

A prefilled telescoping multiple chamber ampoule device separately storing at least two different flowable components includes a container and a piston unit. The container has at least two axially extending chambers with circumferential sealing means projecting inwardly from inner walls of the chambers. The piston unit has at least two pistons and a transversely extending mount integrally adjoining forward ends of the pistons. Each piston has a passage axially extending within its interior as well as an outlet opening at a forward end and a transverse inlet opening near a rearward end. The pistons are arranged for coaxial telescoping movement of the container and the piston unit toward one another from a closed storage position into an open release position. In the closed storage position, the rearward ends of the pistons are spaced from the rearward ends of the chambers so as to define therein reservoirs containing one of the components. The circumferential sealing means prevents fluid communication between the reservoirs and the transverse inlet openings of the pistons so as to prevent release of the components from the reservoirs during transportation and storage. In the open release position, the rearward ends of the pistons are moved toward the rearward ends of the chambers whereby the sealing means expose the transverse inlet openings of the passages of the pistons to the reservoirs so as to release the components through the outlet openings of the passages of the pistons as the volumes of the reservoirs are reduced.