Laser scalpel

The laser scalpel was a medical instrument able to cauterise as to cut. (AUDIO: The Burning Prince) During his travels with Nyssa, the Fifth Doctor carried one, and said that "every home should have one - or will have one". (AUDIO: The Land of the Dead)

The Seventh Doctor had one in his TARDIS; Hex once stole it for use in helping cure the sick of the Scutari barracks. He tried to get Florence Nightingale to use it on him after he was shot in the chest, but it was destroyed before she could use it. (AUDIO: The Angel of Scutari)

Princess Aliona of the Drashani Empire's Royal House of Gadarel used one to sever the hand of Prince Kylo of the rival House of Sorsha. (AUDIO: The Burning Prince)

It was employed by the humanoid surgeon Crozier, on Thoros Beta, during a brain transplant. (TV: Mindwarp)

According to the Sixth Doctor, a healing beam worked better than "the old laser scalpel". (TV: The Twin Dilemma)

The Second Rani threatened Peri Brown with a laser scalpel to force the Sixth Doctor to do as she ordered. (AUDIO: The Rani Elite)

Archer threatened Fitz Kreiner with a laser scalpel in Farside Station's sickbay. (PROSE: Fear Itself)