Vented blood sampling device

1. An extravascular system comprising:

a body having a proximal end, a distal end, and an inner lumen extending therethrough;

a septum disposed within the inner lumen and dividing the inner lumen into a distal chamber and a proximal chamber;

a septum activator disposed within the proximal chamber of the inner lumen proximal the septum, the septum activator having an inner passage extending therethrough; and

a blood sampling device separate and apart from the septum activator, and having a distal portion that couples to the proximal end of the body when the blood sampling device is inserted into the body, the blood sampling device having a tube extending outwardly from the distal portion and comprising a tip that passes through the septum activator and the septum and remains is positioned within the distal chamber when the blood sampling device is inserted into the body such that the tube passes through the septum without causing the septum activator to pass through the septum, the tube having an interior in fluid communication with the tip and a reservoir of the blood sampling device, the blood sampling device further comprising a vent in fluid communication with the reservoir and being capable of passing air but not blood therethrough.

2. The extravascular system of claim 1 , wherein an outer diameter of the tube is less than an inner diameter of the inner passage of the septum activator.

3. The extravascular system of claim 1 , wherein the septum divides and substantially seals the distal chamber of the inner lumen from and the proximal chamber of the inner lumen, the septum having one or more slits therein, the septum activator being movable from an un-activated position in the proximal chamber to an activated position that extends through the slit of the septum into the distal chamber.

4. The extravascular system of claim 1 , wherein the blood sampling device has a portion of an outer geometry approximately equal to that of the inner lumen of the body such that the blood sampling device can be press fit within the inner lumen of the body.

5. The extravascular system of claim 1 , wherein the blood sampling device has a Luer connector that selectively interlocks with a Luer connector disposed on the body.

6. The extravascular system of claim 1 , wherein the body is either a catheter assembly or a Luer access port.

7. The extravascular system of claim 1 , wherein the septum and the body form a fluid tight connection that circumscribes the septum.

8. The extravascular system of claim 1 , wherein the reservoir has a volume equal to or greater than about 0.1 mL.

9. The extravascular system of claim 1 , wherein the tube has a length greater than or equal to about 5 mm and a width of less than or equal to about 3 mm.

10. The extravascular system of claim 1 , wherein at least a portion of the blood sampling device defining the reservoir is compressible and decreases the internal volume of the reservoir when compressed.

11. An extravascular system comprising:

a body having an inner lumen;

a septum disposed within the inner lumen and separating the inner lumen into a proximal chamber and a distal chamber;

a septum activator disposed within the inner lumen proximal the septum, the septum activator having an inner passage extending therethrough; and

a blood sampling device comprising a tube having a tip that extends through the inner passage of the septum activator and through an opening in the septum to a maximum insertion depth that locates the tip within the distal chamber of the inner lumen without causing the septum activator to pass through the septum such that the septum activator remains proximal to the septum when the tip is positioned distal to the septum, the blood sampling device having a reservoir in fluid communication with the tube and the tip, and further comprising a vent in fluid communication with the reservoir, the vent passing air but not blood therethrough.

12. The extravascular system of claim 11 , wherein the septum divides and substantially seals the distal chamber of the inner lumen from and the proximal chamber of the inner lumen, the septum having one or more slits therein, the septum activator being movable from a un-activated position in the proximal chamber to an activated position that extends through the slit of the septum into the distal chamber.

13. The extravascular system of claim 11 , further comprising a removable seal disposed across the vent preventing air from passing through the vent.

14. The extravascular system of claim 11 , wherein the blood sampling device is removably coupled to the body.

15. The extravascular system of claim 11 , wherein the septum and the body form a fluid tight connection that circumscribes the septum.