great thread topic:
try this: use a 10mL syringe, and pull the plunger all the way out to the hilt. then, attach the 18g needle that you use to draw up meds. this gives you about a foot of reach to keep your hands out of the frame. you use the pointer in your left and then can simultaneously start the injection with your right. no need to turn your back to drop the stuff back on the sterile tray. this come is handy particularly for MBBs. point with your left, take a pic, dive into the skin, then move to next level, point with your left take a pic, dive into the skin, etc.
the good part about this is you are not really wasting anything (other than a cheap 10mL syringe) and you dont need to have any separate equipment sterilized/autoclaved. it will also save you a bunch of radiation b/c you will be taking fewer shots this way