Bossa Studios created the surgery game "Surgeon Simulator 2013" in a weekend. It's somewhere between Operation, advanced medical training simulations, and splatterpunk films. From the description on Steam Greenlight:
You are Nigel Burke... an ordinary guy, with no outstanding skills. Somehow forced to perform an array of vastly complicated procedures, using any tools available. Your goal will be to complete every operation in the quickest time possible, with minimal blood loss!"Surgeon Simulator 2013"