Patent ID: 8202257
Filing Date: 2012-06-19
Classification: A61M

Abstract:
1. A syringe comprising: a barrel including a fluid chamber, a proximal end, a distal end defining a roof facing said proximal end, said roof including an opening therethrough, and an elongate tip extending from said distal end including a passageway therethrough in fluid communication with said chamber and said opening; a plunger slidably disposed within said barrel, said plunger including a plunger head that faces said roof, said plunger head being cone shaped with a tip that protrudes into the opening when said plunger head contacts said roof; and a first protrusion and a second protrusion disposed on said roof, said first protrusion adapted to form a first channel between said plunger head and said roof by contacting said plunger head without contacting any ridge on said plunger head and said second protrusion adapted to form a second channel between said plunger head and said roof by contacting said plunger head without contacting any ridge on said plunger head when said plunger is distally extended, said first and second channels adapted to isolate fluid from said passageway, said plunger head not contacting said roof.