Patent ID: 7867215

Claim:
A fluid transfer device for temporarily establishing fluid communication between a drug bottle and an infusion fluid container that is adapted for transferring a medical substance from the drug bottle to the infusion fluid container for mixture with infusion fluid contained therein and the fluid transfer device is configured to prevent leakage of the medical substance into the ambient environment during both transfer of the medical substance into the infusion fluid container and after disconnect of the fluid transfer device from the infusion fluid container, said fluid transfer device comprising: a first end including a connecting portion for interconnection with a drug bottle containing a fixed dose of a medical substance; a second end opposite said first end and configured to be releasably coupled to an injection port of the infusion fluid container that is sealed by a pierceable flexible barrier, said second end of said transfer device having a flexible membrane located to be pressed against the flexible barrier of the injection port when coupled thereto; and a first member having a hollow needle attached thereto and said first member being telescopically associated with a second member so that upon displacement in a first direction of said first member relative to said second member when said fluid transfer device is coupled to the injection port, said hollow needle pierces said flexible membrane and the flexible baffler whereby creating a fluid passage from said first end into the infusion fluid container with whereby a double membrane seal is formed around said hollow needle by said flexible membrane and said flexible barrier of the injection port, and wherein said first member is arranged to be displaceable in a second opposite direction while said fluid transfer device is connected to said infusion fluid container and said drug bottle, to reverse said displacement relative to said second member.