Of course I do! That particular setup is for a knee arthroscopy, or knee scope.
Oxygen, a little IV sedation, and then the red capped needle (25ga x 1.5 inches) goes subcutaneally in several places around the knee, and the green capped needle (18ga x 3 inches) goes into the articular capsule of the knee - actually inside the joint. Sometimes I can aspirate synovial fluid, and if so, I try to remove as much as I can, but most often I just inject 30cc or so of local anesthetic. This is all done pre-operatively, so during the surgery there's minimal pain. I can run much lighter levels of anesthesia, bypass the recovery room, and discharge the patient much quicker. Lower cost, better outcomes.
And I get to stick huge needles into people's joints. I have the best job in the world.
:evilgrin: