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A vascular access device may include a gas chamber housed between a body and a septum, and a receptacle in communication with the gas chamber. A method of displacing gas in a medical device may include transferring gas between a gas chamber of a vascular access device and a receptacle housed within

A vascular access device may include a gas chamber housed between a body and a septum, and a receptacle in communication with the gas chamber. A method of displacing gas in a medical device may include transferring gas between a gas chamber of a vascular access device and a receptacle housed within the vascular access device.

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1. A vascular access device, comprising: a body;a unitary septum at least partially housed within the body, the septum having a top disc and bottom disc and a slit extending through the top and the bottom discs, a portion of the top disc remaining fixedly positioned on the body when the unitary sept

1. A vascular access device, comprising: a body;a unitary septum at least partially housed within the body, the septum having a top disc and bottom disc and a slit extending through the top and the bottom discs, a portion of the top disc remaining fixedly positioned on the body when the unitary septum is in an open and a closed position;a gas chamber defined between the body and the top and bottom discs of the unitary septum;a neighboring gas chamber within the body, the neighboring gas chamber being defined on a proximal side by the septum and on a distal side and a radial side by the body; anda vent connecting the gas chamber and the neighboring gas chamber. 2. The vascular access device of claim 1, wherein the body includes a cavity below the septum of sufficient volume to permit a separate access device to communicate fluid with the cavity. 3. The medical device of claim 1, wherein the neighboring gas chamber is an elastomer in communication with the gas chamber. 4. The medical device of claim 1, wherein the septum further includes a connecting portion connecting the top and bottom discs, and a slit extending through the top and bottom discs and the connecting portion. 5. The medical device of claim 4, wherein the gas chamber is between the top disc of the septum, the bottom disc of the septum, the connecting portion of the septum, and an interior surface of the body. 6. The vascular access device of claim 1, wherein the vent is disposed between the body and the bottom disc. 7. A medical device, comprising: a body having a top portion and a bottom portion;a septum at least partially housed within the body, the septum having a top disc and a bottom disc, a portion of the top disc remaining fixedly positioned on the body when the unitary septum is in an open and a closed position;a gas chamber defined between the body and the top and bottom discs of the septum;a neighboring gas chamber coupled to the body, the neighboring gas chamber being defined on a first side by the top portion of the body and on a second side by the bottom portion of the body;a vent placing the gas chamber in gaseous communication with the neighboring gas chamber. 8. The medical device of claim 7, wherein the neighboring gas chamber increases the overall effective volume of the gas chamber. 9. The vascular access device of claim 7, wherein the vent is disposed between the body and the bottom disc. 10. A vascular access device, comprising: a body;a unitary septum at least partially housed within the body, the septum having a top portion, a bottom portion, and a slit extending through the top and the bottom portions, the top portions remaining fixedly positioned on the body when the unitary septum is in an open and a closed position;a gas chamber between the body and the top and bottom portions of the unitary septum;a neighboring gas chamber within the body, the neighboring gas chamber being defined by the septum on only a proximal side; anda vent defined between the body and a portion of the septum, the vent connecting the gas chamber and the neighboring gas chamber. 11. The vascular access device of claim 10, wherein the vent is disposed between the body and the bottom portion of the unitary septum.