Needle assembly
A blood collection set including a non-patient needle assembly interconnected with an intravenous needle assembly through tubing is provided. The non-patient needle assembly includes a hub assembly adapted for mounting with a blood collection set, and an internal blunting member including a blunted tip. The non-patient needle assembly further includes an external cannula concentric with the internal blunting member and including a non-patient puncture tip adjacent the blunted tip. The external cannula is axially displaceable with respect to the hub assembly between a first retracted position in which the non-patient puncture tip extends beyond the blunted tip and a second activated position in which blunted tip extends beyond the non-patient puncture tip.
1. A non-patient safety needle assembly for mounting with a conventional intravenous blood collection set comprising:
a non-patient hub assembly having opposing first and second ends and a central opening extending through said hub assembly from said first end to said second end, said first end adapted for mounting with a blood collection set,
an internal blunting member in fixed engagement with said non-patient hub assembly and extending through said central opening of said hub assembly,
said internal blunting member having a first end concentric with said non-patient hub assembly,
a second end of said blunting member having a blunted tip and an internal lumen extending through said internal blunting member from said first end of said blunting member to said blunted tip,
an external non-patient cannula concentric with said internal blunting member and axially displaceable within said non-patient hub assembly, said external non-patient cannula including a non-patient puncture tip adjacent said blunted tip of said internal blunting member,
said external non-patient cannula adapted for axial displacement with respect to said non-patient hub assembly about said internal blunting member between a first retracted position in which said non-patient puncture tip extends beyond said blunted tip of said internal blunting member and a second activated position in which said blunted tip of said internal blunting member extends beyond said non-patient puncture tip of said external non-patient cannula, and
a sleeve extending about said non-patient puncture tip, wherein said non-patient puncture tip can be inserted into and removed from a blood collection tube having a pierceable membrane while said external non-patient cannula is in said first retracted position.
2. A non-patient safety needle assembly as in claim 1 , further comprising a carriage assembly integral with said external non-patient cannula and concentric with said internal blunting member, said carriage assembly provided for slidable engagement with said non-patient hub assembly.
3. A non-patient safety needle assembly as in claim 1 , further comprising a fitting for engagement with a blood collection set.
4. A non-patient safety needle assembly as in claim 3 , wherein said fitting comprises a luer fitting.
5. A non-patient safety needle assembly as in claim 1 , further comprising means for attaching said non-patient needle assembly to a holder capable of holding blood collection tubes.
6. A non-patient safety needle assembly as in claim 5 , wherein said attaching means comprises threads extending circumferentially about said non-patient hub assembly.
7. A non-patient safety needle assembly as in claim 1 , wherein said external non-patient cannula is axially displaceable between said first retracted position and said second activated position in a single axial direction.
8. A non-patient safety needle assembly as in claim 7 , further comprising a locking mechanism for preventing axial displacement of said external cannula from said second activated position to said first retracted position.