Threader, Thread former. Bone tap: device used to create a threaded channel in bone for a fixation screw or prior to the insertion of a dental implant into an osteotomy.
Metal tap: an instrument made out of a hard metal, used for rethreading damaged internal threads of a dental implant.
A surgical procedure to drain off body fluid with a hollow needle or a tube.
A pipe with a closing valve and a handle which can be turned to make a liquid or gas come out of a container.