Patent ID: 7544181
Filing Date: 2009-06-09
Classification: A61M,Y10S

Abstract:
1. A disposable injection syringe comprising: an injection needle, a tubular cylinder having first and second ends with a free opening at the first end, an end part having a through hole for slidably accommodating the injection needle at the second end of the cylinder, a piston reciprocally accommodated in the cylinder for movement toward and away from the needle, a piston rod attached to the piston and extending into the cylinder through the free opening at the first end of the cylinder, a coupling for interlocking the piston and the injection needle, wherein the coupling further comprises male and female coupling parts, one of which is attached to the piston and the other of which is attached to the injection needle, with the coupling parts being initially spaced from each other, and wherein the female coupling part comprises a coupling ring, and the male coupling part comprises a coupling barb for interlocking with the coupling ring only when the piston moves away from the needle, wherein the female coupling part further comprises a socket for attachment of the injection needle, and a link between the socket and the coupling ring, and the female coupling part further comprises a second part inserted between the link and the socket, the second part having at least one flexible leg with a free end face which merge via a bridging member into the link, and a needle hub having an internal annular protrusion with a lower protruding edge defining a seat for abutment or engagement of the end face of the second part.