Disposable self-shielding aspirating syringe

  • US RE37,439 E1
  • Filed: 07/15/1998
  • Issued: 11/06/2001
  • Est. Priority Date: 05/09/1990
  • Status: Expired due to Term
First Claim
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1. A medical syringe for injecting medication into a human, comprising a syringe body, and a protector case movable with respect to the body to expose a needle connected to the body for injection and to cover the needle for disposal, the body having a cavity for receiving a medicine cartridge, the body having a first forward end to which the needle is attached and which needle also is capable of penetrating a cartridge for injecting medicine through the needle into a human, and the body having a second end into which a cartridge can be inserted,a protector case adapted to slidably fit on the body, and having a first open end through which a needle may extend and a second end, the case and the body have cooperating detents for facilitating placement of the case with respect to the body for uncovering and covering, respectively, an exposed end of the needle, and wherein the first open end of the case is substantially cylindrical with a plurality of radially disposed slots and wherein an outer area of the first open end thereof is in the shape of a solid annular ring, and a plunger assembly for cooperatively mating with the second end of the body and comprising a movable plunger which is movable with respect to the body for causing medicine from a cartridge to be administered through the needle, the plunger comprising a first end adapted to be manipulated by the user of the syringe and a second end adapted to be inserted into the body for engaging a stopper of a cartridge therein, the plunger being molded of plastic and the second end thereof having an integrally molded harpoon thereon which is adapted to engage and connect with a stopper of a cartridge disposed in the body.

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