Medi-Gel? Is that anything like Bio-Foam? It's uh.. you know, you've got a bullet wound, or a stab, or puncture, and you shove that nozzle in there and inject the foam into the wound, and it fills out and applies anti-septic, a clotting agent, morphine and a little dose of adrenaline? Seals up the wound tight, keeps all the blood in the body where it belongs. Doesn't come out until you make it to the infirmary and they use the wand on you?