Enveloping needle stick protection device

1. A needle stick protection device, comprising:

a housing shaped and dimensioned for positioning about a syringe with an attached needle, the housing includes a first housing member telescopically coupled to a second housing member;

the first housing member including an open first end shaped and dimensioned for receiving the syringe and attached needle and an open second end, the first housing member including a first longitudinally extending slot;

the second housing member including an open first end and a substantially closed second end, the second end including an aperture shaped and dimensioned to permit the passage of a needle therethrough, the second housing member including a first detent extending through the first slot; a locking member associated with the first slot of the first housing member for selectively engaging the first detent to control positioning of the second housing member relative to the first housing member; the locking member includes a first lateral retaining recess formed within the first slot for seating of the first detent when the second housing member is in its forward most position, the first lateral retaining recess being circumferentially located along a side of the first slot, and the locking member further includes a first spring biased lock arm composed of a cantilevered beam, which includes a first side that is adjacent to the first lateral retaining recess, wherein the spring biased lock arm circumferentially forces the first detent within the first lateral retaining recess when the second housing member is in its forward most position fully extended relative to the first housing member so that the needle is fully covered by the second housing member; wherein the needle may be selectively covered and uncovered by selective alignment of the first detent with the slot in a manner permitting controlled motion of the first housing member relative to the second housing member; and the locking member further includes a lateral locking recess formed along the slot and adjacent a second side of the spring biased lock arm opposite the first side of the spring biased lock arm, wherein the needle is permanently covered when the detent is positioned within the lateral locking recess, wherein the spring biased lock arm includes a living binge portion adjacent its free end creating a flexible tip at the free end of the spring biased lock arm which permits flexion of the tip about the living hinge portion in a manner allowing the detent to move from the first side of the spring biased lock arm to the second side of the spring biased lock arm.

2. The needle stick protection device according to claim 1 , wherein the slot, on the first side of the spring biased lock arm, includes a first transverse surface, a first parallel surface, an oblique contact surface, a second transverse surface and a second parallel surface adjacent a tip of the spring biased lock arm.

3. The needle stick protection device according to claim 2 , wherein the second parallel surface prevents the tip from bending in a manner permitting the detent to move from the second side of the spring biased lock arm to the first side of the spring biased lock arm.

4. The needle stick protection device according to claim 3 , wherein the oblique contact surface and the transverse surface define the first lateral retaining recess.

5. The needle stick protection device according to claim 4 , wherein the slot, on the second side of the spring biased lock arm, includes a third transverse surface, a third parallel surface, as well as a fourth parallel surface and fourth transverse surface defining the lateral locking recess.

6. The needle stick protection device according to claim 3 , wherein the slot, on the second side of the spring biased lock arm, includes a third transverse surface, a third parallel surface, as well as a fourth parallel surface and a fourth transverse surface defining the lateral locking recess.

7. The needle stick protection device according to claim 2 , wherein the oblique contact surface and the transverse surface define the first lateral retaining recess.

8. The needle stick protection device according to claim 1 , wherein the first housing member further includes a second longitudinally extending slot and the second housing member further includes a second detent extending through the second slot.

9. The needle stick protection device according to claim 8 , wherein the locking member further includes a second lateral retaining recess formed within the second slot for seating of the second detent when the second housing member is in its forward most position and a second spring biased lock arm biasing the second detent within the second lateral recess when the second housing member is in its forward most position.

10. The needle stick protection device according to claim 9 , wherein the first and second spring biased lock arms are respective cantilevered beams.

11. The needle stick protection device according to claim 1 , wherein the first housing member includes means for selectively attaching to a syringe.

12. The needle stick protection device according to claim 11 , wherein the means for selective attachment includes a pair of opposed slots at the first end of the first housing member, the opposed slots being shaped and dimensioned for receipt of the syringe.

13. The needle stick protection device according to claim 1 , wherein the slot, on the first side of the spring biased lock arm, includes a first transverse surface, a first parallel surface, an oblique contact surface, a second transverse surface and a second parallel surface adjacent a tip of the spring biased lock arm.

14. The needle stick protection device according to claim 1 , wherein the slot, on the second side of the spring biased lock arm, includes a third transverse surface, a third parallel surface, as well as a fourth parallel surface and fourth transverse surface defining the lateral locking recess.

15. The needle stick protection device according to claim 1 , further including a spring positioned between the second end of the first housing member and the first end of the second housing member, the spring urging the first housing member and the second housing member to a fully telescoped position in which the needle is exposed.

16. The needle stick protection device according to claim 1 , wherein the second housing member further includes a slide actuating portion secured to the first detent of the second housing member facilitating controlled movement of the second housing member relative to the first housing member.

17. The needle stick protection device according to claim 1 , wherein the housing is transparent.

18. The needle stick protection device according to claim 1 , wherein the slide actuating portion is a thumb pad.