Disposable safety syringe

Claim 2

A disposable safety syringe assembly comprising: (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 having a bore extending at least partially therethrough, and a needle breakable seal at the end thereof; (b) a backward and forward slidable 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 a 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; and 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 locking member at its forward end, said locking member being capable of locking and unlocking with the locking member of the needle assembly; (d) wherein said locking member on said needle assembly consists of the female half of a 1/4-turn "T" mechanism.

Claim 3

The disposable safety syringe assembly of claim 1, wherein said gasket member on said plunger assembly comprises a resilient material capable of engaging in a sealing frictional engagement with the inner wall of the syringe barrel assembly, and wherein said resilient material is slidable with respect thereto, thereby facilitating the drawing of liquid into said barrel upon retraction of said plunger and projection of said fluid from said barrel upon protraction of said plunger.

Claim 4

A disposable safety syringe assembly comprising: (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 having a bore extending at least partially therethrough, and a needle breakable seal at the end thereof; (b) a backward and forward slidable 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 a 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; and 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 locking member at its forward end, said locking member being capable of locking and unlocking with the locking member of the needle assembly; (d) wherein said locking member on said plunger assembly consists of the male half of a 1/4-turn "T" mechanism.

Claim 5

A disposable safety syringe assembly comprising: (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 having a bore extending at least partially therethrough, and a needle breakable seal at the end thereof; (b) a backward and forward slidable 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 a 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; and 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 locking member at its forward end, said locking member being capable of locking and unlocking with the locking member of the needle assembly; (d) wherein said locking member on said plunger assembly consists of the male half of a 1/4-turn "T" mechanism.

Claim 6

The disposable safety syringe assembly of claim 1 or 3, wherein the locking members on said needle and plunger assemblies are adapted for repeated movement of locking and unlocking and when locked are capable of drawing said needle back into the syringe barrel assembly.

Claim 7

The disposable safety syringe assembly of claim 1 or 3, in which the syringe assembly is sealed in a sterile manner.

Claim 8

The disposable safety syringe assembly of claim 1 or 3, wherein the needle assembly has been pushed through the forward end of the barrel assembly, and locked therein by the friction between the two constricted tip portions, forming an interference or wedge fit.

Claim 9

The disposable safety syringe assembly of claim 1 or 3, wherein the barrel assembly includes a finger extension extending radially outward, said finger extension being positioned closer to said rearward end than to said forward end thereof.

Claim 10

The disposable safety syringe assembly of claim 1 or 3, wherein the plunger assembly includes a break-off means, located closer to said forward end than to said rearward end thereof, such that after withdrawal of the needle assembly into said barrel assembly, said plunger assembly may be broken off, rendering the syringe incapable of reuse.

Claim 11

The disposable safety syringe assembly of claim 8, wherein the plunger assembly has been broken off via the break-off means, and whereby the needle assembly is retained within the barrel assembly, such that the syringe is suitable for disposal.

Claim 12

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 is open ended in its rearward end, and wherein the forward end is provided with a constricted neck portion having a bore extending at least partially therethrough, and a needle breakable seal at the end thereof; (b) a backward and forward slidable 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 a 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 locking member at its forward end, said locking member being capable of locking and unlocking with the locking member of the needle assembly; (d) wherein said locking member on said needle assembly consists of the female half of a 1/4-turn "T" mechanism.

Claim 13

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 is open ended in its rearward end, and wherein the forward end is provided with a constricted neck portion having a bore extending at least partially therethrough, and a needle breakable seal at the end thereof; (b) a backward and forward slidable 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 a 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 locking member at its forward end, said locking member being capable of locking and unlocking with the locking member of the needle assembly; (d) wherein said locking member on said needle assembly consists of the female half of a 1/4-turn "T" mechanism.

Claim 14

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 having a bore extending at least partially therethrough, and a needle breakable seal at the end thereof; (b) a backward and forward slidable 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 a 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 removable 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 locking member at its forward end, said locking member being capable of locking and unlocking with the locking member of the needle assembly; (d) wherein said locking member on said plunger assembly consists of the male half of a 1/4-turn "T" mechanism.

Claim 15

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 having a bore extending at least partially therethrough, and a needle breakable seal at the end thereof; (b) a backward and forward slidable 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 a 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 removable 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 locking member at its forward end, said locking member being capable of locking and unlocking with the locking member of the needle assembly; (d) wherein said locking member on said plunger assembly consists of the male half of a 1/4-turn "T" mechanism.

Claim 16

The disposable safety syringe assembly of claim 10 or 11, wherein said gasket member on said plunger assembly consists of a resilient material capable of engaging in a sealing frictional engagement with the inner wall of the syringe barrel assembly, and wherein said resilient material is slidable with respect thereto, thereby facilitating the drawing of liquid into said barrel upon retraction of said plunger and projection of said fluid from said barrel upon protraction of said plunger.

Claim 17

The disposable safety syringe assembly of claim 10 or 11, wherein the locking members on said needle and plunger assemblies are adapted for repeated movement of locking and unlocking and when locked are capable of drawing said needle back into the syringe barrel assembly.

Claim 18

The disposable safety syringe assembly of claim 10 or 11, in which the syringe assembly is sealed in a sterile manner.

Claim 19

The disposable safety syringe assembly of claim 10 or 11, wherein the needle assembly has been pushed through the forward end of the barrel assembly, and locked therein by the friction between the two constricted tip portions, forming an interference or wedge fit.

Claim 20

The disposable safety syringe assembly of claim 10 or 11, wherein the barrel assembly includes a finger extension extending radially outward, said finger extension being positioned closer to said rearward end than to said forward end thereof.

Claim 21

The disposable safety syringe assembly of claim 10 or 11, wherein the plunger assembly includes a break-off means, located closer to said forward end than to said rearward end thereof, such that after withdrawal of the needle assembly into said barrel assembly, said plunger assembly may be broken off, rendering the syringe incapable of reuse.