Patent ID: 8585653
Filing Date: 2013-11-19
Classification: A61B,A61M,Y10S

Abstract:
1. A method of preventing leakage of blood from a needle assembly comprising: a) receiving blood through a patient puncture tip and into a first chamber of the needle assembly, the needle assembly comprising: b) establishing fluid communication between the non-patient puncture tip and a negative pressure source such that blood contained within the first chamber is drawn out of the non-patient puncture tip and air is drawn out of the second chamber through the porous vent, thereby establishing a negative pressure within the second chamber relative to the external environment of the needle assembly such that blood flows through a cannula into the first chamber and contacts the porous vent; and c) drawing blood through the pores of the porous vent toward the second chamber based upon the negative pressure established within the second chamber such that blood contained within a lumen of the patient puncture tip is displaced away from the patient puncture tip and toward the second chamber.