Injection syringe
AssigneeBunder Glas GmbH
InventorHans Worder
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Abstract
The invention provides an injection syringe of the kind comprising one or two sterile units, which has a full cylinder ampoule the rear end of which is sealed by a plug serving as a piston, and the front end of which is sealed by a pierceable seal, and with a unit in form of a syringe body formed as a support with or without a tubular needle, for the accommodation of a cylinder ampoule and a tubular needle shield, characterized by the syringe body for accommodating the full cylinder ampoule being developed as a plastic body and, in the inside space being provided with a bored-through piercing point projecting inwards, the bored-through piercing point also consisting of plastic and forming one unit with the syringe body.
Claims5
In an injection syringe of the kind having a body formed with a chamber for receiving by axial movement a cylindrical ampoule of the kind having a sealing plug at one end serving as a piston and a piercable seal at the other end, the provision of
- (a) a piercing point extending axially within the body into the chamber capable of entry into said ampoule by penetrating said seal when the ampoule is pressed axially into said chamber,
- (b) said piercing point having a bore therethrough to effect communication of the interior of said ampoule with the exterior of the syringe body when the piercing point has penetrated the seal,
- (c) the outer surface of said piercing point being inwardly tapered over the entire length thereof, whereby the compression stress between the tapered piercing point and pierced seal ensures sealing thereinbetween,
- (d) said piercing point being formed integrally with said syringe body as a one-piece plastic unit, and
- (e) a conical shaped projection integral with said body for reception of a needle assembly, said projection having therein a continuation of the bore within said piercing point.
Dependencies are inferred from the claim text.