Patent ID: 8668681

Claim:
A multi-chamber container comprising: a medical bag made of a soft film and having a welded part, which welds the opposite surfaces of the medical bag in a manner that they are separable under a pressure, the welded part separating the inner cavity of the medical bag into partitions, which partitions store, respectively, medical liquids; an outlet port mounted to the medical bag; a first aperture for opening the inside of the medical bag to the inside of the outlet port for an infusion; a plug member mounted to the outlet port while facing the outside of the medical bag, said plug member being for piercing an infusion set; a valve member normally closing said first aperture to the inside of the medical bag, said valve member being responsive to an outside force for causing the first aperture of the outlet port to open, and; a second aperture for generating a liquid flow of limited amount from the inside of the medical bag to the outlet port when the valve member is situated for closing the first aperture, wherein said second aperture is integrally formed on said outlet port.