Stumped by a medical device crossword clue? Discover the answer here

Stumped by a medical device crossword clue? Discover the answer here - VIOLETRAY
Bygone medical device used in electrotherapy … or a description of 111-Across?

11 letters
Used in electrotherapy
Purple
Bygone medical device
Used for treating an ailment
Emitted energy beams
Preceded modern technology
Operated with electricity

VIOLETRAY