Blood aspiration assembly septum and blunt needle aspirator

摘要

A blood aspiration assembly has an aspirator receiver. The receiver has a housing with a rigid casing and a resilient plug, and a liquid flow chamber. The chamber has an offset lower wall surface, to create turbulence to remove air bubbles during initial set up. The offset wall can be elevated with an intermediate part of larger cross section to accommodate the blunt needle. The plug has a slit or perforation to allow passage of a blunt needle therethrough. The plug can have two parts of different compliance, with aligned slits or perforations. The blunt needle tip can be rounded or flat, with a side opening for the needle bore. The contour of the needle tip and the design of the plug are correlated such that the working force required to penetrate the needle tip into the plug perforation is considerably less than the force required for said needle tip to penetrate normal intact human skin of the hands or arms. A stop prevents the needle from contacting the aspiration chamber wall.