Patent ID: 6361525
Filing Date: 2002-03-26
Classification: A61M

Abstract:
A syringe comprising:a barrel having a fluid chamber, a proximal end, a distal end and an elongated tip extending from said distal end having a passageway therethrough in fluid communication with said chamber, a collar surrounding said tip, and at least one deflectable locking tab projecting radially inwardly from said collar a needle assembly including a cannula having a proximal end, a distal end and a lumen therethrough, a hub having an open proximal end with a cavity therein, and a distal end joined to said proximal end of said cannula so that said lumen is in fluid communication with said cavity, an outside surface of said hub, said needle assembly being connected to said barrel so that said elongated tip of said barrel is in said cavity of said hub and said outside surface on said hub is adjacent to said at least one locking tab so that said at lease one locking tab prevents removal of said needle assembly from said barrel through contact between said at least one locking tab and said outside surface of said hub, said at least one locking tab being configured to allow assembly of the needle assembly to said barrel through axial motion of the hub toward the barrel; and a plunger including an elongated plunger rod having a longitudinal axis, a proximal portion and a distal portion connected by a breakable connection, wherein said proximal portion, said distal portion and said breakable connection are integrally molded of plastic material, said distal portion including a stopper slidably positioned in fluid-tight engagement with an inside surface of said chamber for drawing fluid into and out of said chamber by movement of said plunger relative to said barrel, said breakable connection being strong enough to hold said proximal portion and said distal portion together during normal use of said syringe and breakable upon application of additional force to said proximal portion.