Patent ID: 6994690
Filing Date: 2006-02-07
Classification: A61M

Abstract:
1. A single use syringe comprising a barrel, and a. a plunger slideable in the barrel, the plunger having a plunger head and an elongate stem, the stem having an extending longitudinal passageway which has an open end which is sealed by frangible portion on the plunger head, b. a hollow needle, c. biasing means about the needle to bias the needle into the barrel, d. holding means which is formed separately from the barrel and which is positioned inside a forward portion of the syringe and which holds the needle against movement into the barrel, the holding means having a first part which is adapted to be pushed forwardly by the plunger, a second stationary part to which the needle is attached, and a frangible portion interconnecting the first and second parts and which is broken when the first part is pushed forwardly to allow the biasing means to bias the second part containing the attached needle through the plunger head and into the longitudinal passageway in the stem, e. said first part of said holding means comprises an outer part, and said second part of said holding means comprises an inner part, f. said inner part of said holding means has a front end and a rear end, the rear end communicating with the inside of said barrel, the rear end comprising a tapered extension which extends into the barrel and which is adopted for contact with the frangible portion on said plunger head, g. the frangible portion on said plunger head being broken by contact with the tapered extension as said plunger is pushed against said holding means, and h. wherein said frangible portion on said plunger head substantially conforms to the shape of the tapered extension prior to breaking to facilitate expulsion of all the liquid in the syringe.