Patent ID: 7160267
Filing Date: 2007-01-09
Classification: A61B

Abstract:
1. A device for drawing fluid from a lumen, comprising: a central body having an outer wall and an inner fluid passage; a front cannula incorporated into a butterfly needle housing, said front cannula communicating with the inner fluid passage at a first end of the central body; a rear cannula communicating with the inner fluid passage at a second end of the central body; a flexible sleeve surrounding at least a tip portion of the rear cannula; and a means for venting air from the flexible sleeve, said means for venting being disposed between the rear cannula and the flexible sleeve, wherein the means for venting air includes a porous member, a porous collar, a porous insert, or a porous spacer, and wherein the means for venting air is outside of and adjacent to the rear portion of the central body.