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, 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;

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 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 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 cantileavered beam which circumferentially forces the first detent within the first lateral 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

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.

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

3. 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.

4. The needle stick protection device according to claim 3 , wherein the locking member further includes a second lateral 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.

5. The needle stick protection device according to claim 4 , wherein the first and second spring biased lock arms are respective cantileavered beams.

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

7. The needle stick protection device according to claim 6 , 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.

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