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US 4,391,273 AGranted
Non-reusable, disposable syringes
AssigneeMercantile & Technical Promotions Inc.
InventorMarcelo Chiquiar-Arias
Life of this patent
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AssigneeMercantile & Technical Promotions Inc.
InventorMarcelo Chiquiar-Arias
Estimating the term…
The present invention refers to improvements in disposable items, particularly self-destructing or otherwise automatically non-reusable hypodermic syringes having a self-destructing element which is actuated during the injection stroke of the piston. The invention provides an upper stop member, generally provided by a plate with a circular hole having a diameter permitting withdrawal of the plunger but not the piston and also a cylindrical protuberance adjacent the injection end of the cylinder and extending beyond the cylindrical wall so as to shield the fingers of the user from a self-destructing pin forced through the bottom wall of the cylinder under completion of the injection stroke. A cover plate for said cylindrical protuberance having an interior hole for the injection needle is also shown.
A disposable syringe which renders itself non-reusable which comprises a rigid cylinder having a bottom wall at one end with an opening for the exit of the solution to be injected, and having the other end open, support flanges being affixed to said cylinder adjacent the open end and extending outwardly from the axis of the cylinder, an injection needle integrally attached to the bottom wall of the cylinder and extending outwardly beyond said bottom wall and communicating with said opening, and a plunger with a piston slidably positioned within the cylinder with the piston adjacent the closed end of the cylinder and the other end of said plunger being adapted for pressing to force the piston toward the bottom wall, the piston having puncturing means extending longitudinally therefrom and adapted to puncture the bottom wall of said cylinder so as to prevent reuse, and an annular protrusion extending beyond the bottom wall of the cylinder and integral therewith and having such dimensions as to prevent the user's fingers from being pricked by the puncturing means extending through the bottom wall of the cylinder, said needle extending a sufficient distance beyond said annular protrusion to permit insertion of said needle in said patient, and which includes a cover plate for the opening at the forward end of the annular protrusion, said cover plate having a centrally disposed opening, said injection needle having a diameter less than the inner diameter of said opening in said cover plate and passing through said opening.
A disposable syringe which renders itself non-resuable, which comprises a rigid cylinder having a bottom wall at one end with an opening for the exit of the solution to be injected, and having the other end open, said open end being integrally coupled to support flanges which extend outwardly from the cylinder walls, and a plunger comprising cross-wise arranged flaps with a disc at one end, said cylinder having a longitudinal groove partially penetrating the wall of said cylinder, one of the flaps of said plunger being oppositely aligned with the weakened groove of the cylinder, there being a recess in said flap immediately adjacent said disc of said piston, said recess providing a transversely extending housing, there being compressible means within said housing with the radially outward end of said compressible means attached to a cutting blade positioned to cut the inner wall of the cylinder opposite the longitudinal groove, said cutting blade being guided by a cover of said housing having a slot whereby to prevent twisting of said blade, said blade being positioned so that upon injection of a solution said weakened groove of said wall is cut along the length thereof as the injection proceeds, there being provided oppositely disposed stop means adjacent the open end of said cylinder, said oppositely disposed stop means being spaced from each other a distance less than the diameter of the piston but at least as great as the diameter of the disc, said disc having a smaller diameter than the maximum diameter of the piston, said piston being made of compressible material.
Dependencies are inferred from the claim text.