Patent ID: 8377040

Claim:
A medical device, comprising: a vascular access device, wherein the vascular access device forms part of an extravascular system and is an adapter for at least one other vascular access device; a vent cap removably fastened to a portion of the adapter, the vent cap including a septum and a cap body, the septum and cap body substantially forming a fluid and gas seal when the cap body is fastened to the adapter and the septum is in a closed position; a vent plug having an upper and a lower chamber, the lower chamber formed from at least one lower wall extending away from the upper chamber, the vent plug further having a cannula extending from the vent plug within the lower chamber, the lower chamber selectively mating with and substantially covering the vent cap when the cannula is inserted into the septum of the vent cap; and a gas permeable membrane forming a portion of the upper chamber of the vent plug.