Abstract: An apparatus for shielding butterfly-type needles to protect against accidental needle stick injuries after use. The apparatus includes a locking mechanism for permanently locking the needle within a shield.

Abstract: A nonrefillable syringe including a unique plunger stem/piston arrangement which is designed to disconnect after an injection has been completed. A piston is removably connected to a plunger stem by a first connecting member and a novel nipple assembly. The first connecting member comprises a plurality of circumferentially spaced arms extending longitudinally away from the piston and forming an interior aperture. The nipple assembly includes a tapered nipple removably matable with the aperture formed by the circumferentially spaced arms of the first connecting member, and a cylindrical carrier for slidably positioning the nipple assembly within a hollow end of the plunger stem. The tapered nipple is gradually forced out of the aperture during use of the syringe. When the tapered nipple is forced completely out of the aperture, the piston disconnects from the plunger stem.

Abstract: A syringe shielding apparatus comprising an adapter having a tubular collar and a flexible snap ring joined by a living hinge, and a needle shield. Radially extending projections, provided on the tubular collar, slide within longitudinally extending slots in the needle shield, allowing the longitudinal extension and retraction of the needle shield relative to the housing of the syringe. The flexible snap ring expands into a groove in the needle shield at extension. Expansion of the snap ring into the groove in the needle shield locks the shield in the extended position over the syringe needle.

Abstract: A magnifying syringe shield including a hollow sleeve, a needle shield, and a snap ring. Radially extending projections, provided on the hollow sleeve, slide within longitudinally extending slots in the needle shield, allowing extension and retraction of the needle shield. The snap ring is positioned within a groove in the hollow sleeve at retraction, and extends into a groove in the needle shield at extension. Extension of the snap ring into the groove in the needle shield locks the shield in the extended position over the syringe needle. The needle shield further includes a magnifying arrangement for enlarging the dosage indicia imprinted on the housing of an enclosed syringe.

Abstract: An aspirating non-reuseable syringe is provided which includes a plunger. The main components of the plunger include a piston and a cylindrical plunger stem. The piston is removably connected to the cylindrical plunger stem by first, second, and third connecting members. The connecting members utilize a nipple mating with one aperture and sliding within another aperture to effect aspiration as well as disconnection of the piston from the plunger stem after a single use of the syringe.

Abstract: A needle shield and syringe assembly are provided. The main components of the needle shield are a hollow sleeve, a needle shielding means, and a snap ring. Radially extending protrusions are provided on the hollow sleeve, which slide within longitudinally extending slots in the needle shielding means allowing extension and retraction of the needle shielding means. The snap ring is positioned within a groove in the hollow sleeve at retraction, and extends into a groove in the needle shielding means at extension. Extension of the snap ring into the groove in the needle shielding means locks the shield in the extended position over the syringe needle.

Abstract: A non-reuseable syringe is provided which includes a plunger. The main components of the plunger include a piston and a hollow cylindrical plunger stem. The piston is removably connected to the hollow cylindrical plunger stem by first and second connecting members. The connecting members utilize a nipple mating with an aperture to effect disconnection of the piston from the plunger stem after a single use of the syringe.