It wasn't that much, really. And very little flesh was actually missing. Just cut in ragged ways. So I just trimmed off the shattered nail, washed with warm water, and then peroxide. After patting dry with sterile gauze, I applied two small hydroseal bandages. First around the dorsal (nail) side, and then around the ventral side, with a little overlap. I used a small Skin-Flex bandage, with the gauze pad removed, to prevent the hydroseal bandages from coming off. And used methyl methacrylate to glue the end of the outer bandage.