Abstract: A vial structure wherein the neck of a two-compartment vial has a resilient stopper sealingly seated therein. The stopper has an upper projecting portion of smaller diameter, with the upper and lower portions being joined by an intermediate portion which defines a surrounding annular groove. A cap member surrounds the projecting portion of the stopper and is attached to the vial rim. The cap includes concentric inner and outer sleevelike skirts joined together by a top wall. The inner skirt snugly surrounds the upper stopper portion and terminates in a lower locking flange which projects into the annular groove to prevent the cap from being axially removed from the stopper. This inner skirt can be axially slidably inserted into the neck. The outer skirt is axially longer than the inner skirt and, at the lower end thereof, has a locking flange which resiliently snaps beneath the vial rim to lock the cap thereto.

Abstract: A closure structure for a vial or container, preferably of the two-compartment type, wherein lyophilized medication is contained in one compartment and a solvent is contained in the other compartment with a displaceable, moisture-proof plug disposed between the two compartments. The closure structure is comprised of a stopper which is partially inserted into the neck of a vial and is covered by a cap member having a fastening portion for securing the cap member to the open end of the vial neck and a sleeve portion of reduced diameter which snugly surrounds the protruding portion of the stopper and is disconnectible from the fastening portion in order to move with the protruding portion of the stopper into the neck of the bottle under manually applied pressure. A dust shield is secured to the free end of the sleeve portion and is preferably removed after which the needle of a syringe can be inserted through the stopper to communicate with the interior of the vial.

Abstract: A closure structure for a vial or container, preferably of the two-compartment type, wherein lyophilized medication is contained in one compartment and a solvent is contained in the other compartment with a displaceable, moistureproof plug disposed between the two compartments. The closure structure is comprised of a stopper which is partially inserted into the neck of a vial and is covered by a cap member having a fastening portion for securing the cap member to the open end of the vial neck and a sleeve portion of reduced diameter which snugly surrounds the protruding portion of the stopper and is disconnectible from the fastening portion in order to move with the protruding portion of the stopper into the neck of the bottle under manually applied pressure. A dust shield is secured to the free end of the sleeve portion and is preferably removed after which the needle of a syringe can be inserted through the stopper to communicate with the interior of the vial.