Dr. William T. Bovie invented the Bovie. The Bovie is a nickname for an electrosurgical generator. These devices generate electrical current to cut through tissue during surgery.
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Harvey Cushing and William Bovie worked together and invented the Bovie. This was in 1924 but before that fire was used to cauterize wounds. Today, it is used worldwide for surgeries. You can find more information here: thatsucks.net