Patent ID: 6945962

Claim:
A syringe apparatus comprising: a tubular body; a tubular cartridge capable of containing fluid mounted in said body, said tubular cartridge being sealed at one end by a distal diaphragm and further sealed upstream with a proximal diaphragm, an area between the distal and proximal diaphragms defining a space for holding a distal fluid, said distal diaphragm having a central area of thinner cross-section than an adjacent area of the distal diaphragm; a hollow tubular spike mounted at one end of said body and facing inwardly into said tubular body; a plunger mounted within said tubular body for moving said cartridge towards said spike whereby said spike is operative to puncture said central area of said distal diaphragm and thereby allow said fluid to flow from said cartridge through the hollow of said spike out of said tubular body, the plunger having a plurality of vanes, and another area between the proximal diaphragm and plunger defining a space for holding a proximal fluid, said spike being operative to puncture said proximal diaphragm and fluid to flow from said cartridge through the hollow of said spike out of said tubular body; and a means for effecting an interruption in moving the plunger towards the spike and thereby controlling fluid quantity flowing from the cartridge through the spike, the means being removably attached in a perforated manner to a vane of the plunger and projecting outwardly from the tubular body, the means comprising a first flag stop attached to one of said plurality of vanes and a second flag stop attached to another of said plurality of vanes rearwardly of said first flag stop in a direction of travel of said plug.