(covers information from several alternate timelines)
A protoplaser was a medical device used to treat injuries. The anabolic protoplaser was a specialized version of a protoplaser.
In a delusion created by Commander William T. Riker's mind while he was held captive on Tilonus IV, Doctor Beverly Crusher ordered for an anabolic protoplaser to be used in the treatment of a crewmember who had been injured by an exploding plasma torch. (TNG: "Frame of Mind")
Detailed drawings of a protoplaser device (an "anabolic protoplaser") seen in the Star Fleet Technical Manual match a red, black and pointed tool featured in Star Trek: The Original Series as well as the Star Trek films Star Trek: The Motion Picture and Star Trek II: The Wrath of Khan.