Patent ID: 9662460
Date: 2017-05-30
CPC Classifications: A61M

Claim:
1. A disposable syringe for use in a needleless injector comprising a tubular body having an open end and a partially closed end, a chamber in said tubular body for receiving a fluid, an orifice in the partially closed end of the tubular body for discharging fluid from the tubular body; said chamber having a conical discharge end behind and in fluid communication with said orifice; an annular projection in said conical discharge end of the chamber; a plunger slidable through said open end of the tubular body into said chamber for causing the discharge of fluid from the tubular body when the plunger is pushed towards the orifice; a conical tip on a conical discharge end of the plunger for plugging said orifice when the plunger is pushed into said chamber, the conical tip of the plunger having the same shape and size as the conical discharge end of the chamber; and an annular groove in said tip of said plunger for mating with said projection, whereby, when the plunger is jammed into the chamber and then retracted, the conical tip of the plunger breaks in the area of said groove and the conical tip is retained in the discharge end of the chamber by the annular projection completely blocking the orifice.