Patent ID: 7530977

Claim:
An infusion and/or withdrawal fitting for biomedical fluid circuits, the fitting comprising: a tubular conduit having a first end and a second end, the first end connectable to a biomedical fluid circuit; and a cap adapted to fit onto the second end of the tubular conduit, the cap comprising: a plug movable between an open position and a closed position for opening and closing the second end of the tubular conduit; a collar; a connector adapted for keeping the plug connected to the collar when the plug is in the open position; and a weakened cap portion between the plug and the collar; wherein the tubular conduit comprises a protrusion that breaks the weakened cap portion upon fitting of the cap to the second end of the tubular conduit such that the plug detaches from the collar at the weakened cap portion but remains connected to the collar by the connector, and the collar is retained on the tubular conduit.