Gas expulsion simplification fluid container assembly body and gas expulsion manner

摘要

A venting cap (1) has a female luer taper (2) which fits on the male tapered nose (53) of an arterial blood sampling syringe (50). The cap has a hydrophilic filter (6, 75) of porous polyethylene impregnated with cellulose. Gas is purged from the syringe by holding the capped end of the syringe above its plunger (51) and advancing the plunger until gas and arterial blood is expelled from the nose (53). When blood contacts the filter (6, 75), the filter expands and seals preventing escape of blood. The cap may include a flow restrictor (10) which concentrates blood flow to only a portion of the filter and thereby prevents premature sealing. IMAGE