Nonrefillable syringe
First Claim
1. A nonrefillable syringe comprising:
- a syringe housing;
a plunger movably disposed within the interior of said syringe housing, said plunger comprising;
a plunger stem having a hollow end portion;
a piston attached to said plunger stem;
a first connecting member connected to said piston, said first connecting member comprising a plurality of arms extending longitudinally away from said piston into the hollow end portion of said plunger stem, said arms forming an aperture at an interior thereof;
a nipple assembly comprising a nipple removably matable with said aperture and a carrier for guiding said nipple longitudinally within the hollow end portion of said plunger stem, the arms of said first connecting member forcing said nipple out of said aperture as said piston is displaced within said syringe housing by said plunger stem, said piston disconnecting from said plunger stem after said nipple is forced out of said aperture; and
means for guiding said nipple assembly longitudinally through the hollow end portion of said plunger stem, said guiding means including at least one groove formed on an exterior of said carrier, and at least one complementary runner, formed on an interior of the hollow end portion of said plunger stem, and slidably disposed within said groove, for guiding said nipple assembly longitudinally through the hollow end portion of said plunger stem.
1 Assignment
0 Petitions
Accused Products
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.
102 Citations
13 Claims
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1. A nonrefillable syringe comprising:
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a syringe housing; a plunger movably disposed within the interior of said syringe housing, said plunger comprising; a plunger stem having a hollow end portion; a piston attached to said plunger stem; a first connecting member connected to said piston, said first connecting member comprising a plurality of arms extending longitudinally away from said piston into the hollow end portion of said plunger stem, said arms forming an aperture at an interior thereof; a nipple assembly comprising a nipple removably matable with said aperture and a carrier for guiding said nipple longitudinally within the hollow end portion of said plunger stem, the arms of said first connecting member forcing said nipple out of said aperture as said piston is displaced within said syringe housing by said plunger stem, said piston disconnecting from said plunger stem after said nipple is forced out of said aperture; and means for guiding said nipple assembly longitudinally through the hollow end portion of said plunger stem, said guiding means including at least one groove formed on an exterior of said carrier, and at least one complementary runner, formed on an interior of the hollow end portion of said plunger stem, and slidably disposed within said groove, for guiding said nipple assembly longitudinally through the hollow end portion of said plunger stem. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification