Patent ID: 8048036
Filing Date: 2011-11-01
Classification: A61M,Y10S

Abstract:
1. A syringe for injecting fluids comprising: a barrel comprising a gripping flange at a proximal end and a shoulder at a distal end having an opening; a plunger disposed inside the barrel for pushing fluids out the distal end of the barrel, the plunger having a push flange on a proximal end and a plunger rod on a distal end comprising an end portion; a plunger tip located at the distal end of the plunger and in dynamic sealing arrangement with the barrel; the plunger tip comprising a proximal lip, a distal wall comprising an opening, and an interior cavity; a first pusher plate on the plunger spaced apart from a second pusher plate having the proximal lip disposed therebetween; the second pusher plate being disposed in the interior cavity of the plunger tip, in contact with an interior wall surface of the plunger tip, and spaced apart from the distal wall of the plunger tip proximate the opening when in the ready to use position; wherein the plunger tip comprises a first configuration in which the distal wall contacts the shoulder on the barrel, the second pusher plate and the interior cavity define a first interior space, and the end portion of the plunger rod is spaced apart from the distal wall by a first distance; and wherein the plunger tip comprises a second configuration in which the distal wall remains in contact with the shoulder on the barrel, the second pusher plate and the interior cavity define a second interior space, which is smaller than the first interior space, and the end portion of the plunger rod is spaced apart from the distal wall by a second distance, which is greater than the first distance.