Back to results
US 5,346,474 AGranted
Disposable safety syringe
AssigneeDesign and Engineering Associates
InventorRichard J. King
Life of this patent
Estimating the term…
Abstract
Disclosed is a syringe assembly which greatly reduces the chances of an operator coming in contact with an infectious needle. The syringe assembly is initially provided with its needle retracted within its barrel, in a sterile and safe environment. When used, the needle is engaged by the plunger, and locked in place at the forward end of the syringe barrel. Before disposal, the needle is withdrawn back into the barrel, and the plunger is broken off. Thus, the disposed of syringe is incapable of being reused, and there is little or no danger of accidental punctures, because the needle is retained within the syringe barrel.
Claims19
A disposable safety syringe assembly characterized by having:
- a substantially elongated nonbreakable translucent plastic barrel assembly, said barrel assembly having a forward end, a rearward end, an exterior surface and an interior surface, with the interior surface defining an interior space, and wherein the barrel assembly is open ended in its rearward end, and wherein the forward end is provided with a constricted neck portion with a bore extending only partially therethrough;
- (b) a needle assembly, disposed within said barrel assembly, said needle assembly including a substantially cylindrical hub member having a forward end and a rearward end, wherein the rearward end is provided with an internal twist-locking member, and the forward end is provided with a constricted neck portion, said hub member further having a bore therethrough for communicating with the interior space of the barrel assembly;
- wherein the constricted neck portion of said needle assembly is of a size and shape to removably wedge fit within the constricted neck portion of said barrel assembly, and
- wherein said needle assembly further includes a hollow needle mounted within the forward end of said hub member and passing through said constricted neck portion;
- said needle being capable of penetrating the partially open bore at the end of the barrel neck, when said assemblies are mated;
- and
- (c) a plunger assembly including a breakable plastic rod portion movable with respect to the syringe barrel assembly, said rod portion including a gasket member mounted near its forward end, and terminating with a twist-locking member at its forward end, said locking member being capable of locking and unlocking with the internal twist-locking member of the needle assembly by application of rotational force with application of less than one complete rotational movement.
4 more elements
A disposable safety syringe assembly consisting of:
- (a) a substantially elongated barrel assembly, said barrel assembly having a forward end, a rearward end, an exterior surface and an interior surface, with the interior surface defining an interior space, and wherein the barrel assembly is open ended in its rearward end, and wherein the forward end is provided with a constricted neck portion with a bore extending at least partially therethrough;
- (b) a needle assembly, disposed within said barrel assembly toward the forward end thereof, said needle assembly including a substantially cylindrical hub member having a forward end and a rearward end, wherein the rearward end is provided with an internal twist-locking member, and the forward end is provided with a constricted neck portion, said hub member further having a bore therethrough for communicating with the interior space of the barrel assembly;
- wherein said constricted neck portion of said needle assembly is of a size and shape to removably wedge fit within the constricted neck portion of said barrel assembly, and
- wherein said needle assembly further includes a hollow needle mounted within the forward end of said hub member and passing through said constricted neck portion;
- and
- (c) a plunger assembly including a rod portion movable with respect to the syringe barrel assembly, said rod portion including a gasket member mounted on the rod near its forward end, and terminating with a twist-locking member at its forward end, said locking member being capable of locking and unlocking with the internal twist-locking member of the needle assembly with application of less than one complete rotational movement.
3 more elements
Dependencies are inferred from the claim text.