Use of Electrocautery with Metal Port/injection Domes?

I have Mentor tissue expanders with a silicone elastomer injection dome that my ps finds with a magnet detector device of some kind; I now have to have a colonoscopy and my gastroenterologist wonders if he can use electrocautery to burn a polyp. When I asked my ps, he said they do additional surgery with electrocautery all of the time. Is there anything specific information my gastroenterologist knows to insure that I'm not burned during the procedure?