Sonic-scalpel

In the comic book Time Surgeon, the sonic-scalpel was a weapon wielded by the Time Surgeon. By performing offensive "surgery", the Time Surgeon could use the sonic-scalpel to tear a Deathroid in half, which he did so in Day of the Deathroids. (COMIC: Invasion of the Mindmorphs)

Behind the scenes
The sonic-scalpel is a clear allusion to the Doctor's sonic screwdriver.