Flask for sterile liquids

Claim 1

A flask for sterile liquids capable of supporting a terminal sterilization of pharmaceutical quality, comprising a body provided with a neck, a tamper-proof closure comprising a cap screwed on the neck of the flask, and a locking ring formed in two parts axially superposed and joined by a breakable zone, one of the parts being axially carried away by the cap during opening of the flask and the other part being held axially by a shoulder formed on the neck, characterized in that the cap encloses a seal made of elastomeric material capable of withstanding sterilization of the flask without important deformation, said seal being inserted between the bottom of the cap and the edge of the neck; the seal is axially held by the cap and comprises a skirt applying itself against the inner surface of the neck in a bacteriologically sealproof manner along a height sufficient to ensure a bacteriological closure seal until the locking ring is broken; the locking ring in unbroken condition is completely concealed by the cap; a radial clearance is provided on either side of the locking ring, which is sufficient so that, after breaking of the locking ring, that part of the ring which is held by the neck shoulder falls and rests on a shoulder of the flask when the flask stands upright, and the said falling part is of a colour contrasting with that of the flask, and the length of the neck being sufficient for a segment of the neck to be visible between that part of the ring resting on the shoulder of the neck and the lower edge of the cap when the said cap is secured back on the neck.