Patent ID: 8002734

Claim:
A double chamber container for separately holding and combining a solid lyophilizate and a liquid reconstituting medium therefor, comprising a cylindrical body extending in a longitudinal direction, with a closure at each of the two ends of the body, an upper displaceable closure at the reconstituting medium end, and a lower closure at the lyophilizate end, a separating stopper which can be pushed along by the application of pressure, in the cylindrical body and acting as a seal between the upper chamber and the lower chamber, the separating stopper having a top surface, a bottom surface, and a side face extending between the top and bottom surfaces, and at least one opening in the side face provided at a first defined distance from the top surface and a second defined distance from the bottom surface, the at least one opening leading to a channel extending inside of the separating stopper in a longitudinal direction from the at least one opening to the bottom surface, characterized in that the first and second defined distances are selected so that the separating stopper can assume two positions, wherein in a first position within an upper end of the cylindrical body, the separating stopper closes off the upper end of the cylindrical body without closing off the least one opening; and a bypass arranged underneath the separating stopper, with a length L that is preferably greater than the height H of the separating stopper.