Multiple sample needle assembly with vein entry indicator

摘要: A multiple sample needle assembly useful in collecting liquid samples from a source comprises housing (12) with chamber therein. first cannula (14) is fluid communication the and adapted for insertion into source. second (15) also to deliver passing through collector (16). gas-permeable, liquid-impermeable porous member positioned lumen of (15). The preferably includes at least one side hole an operable valve (41) by diverting flowing therethrough away member.