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Hand-held tools or implements used by health professionals for the performance of surgical tasks.

An instrument for withdrawing fluid from a cavity, or for use in paracentesis; it consists of a metal tube (cannula), open at both ends, in which fits a rod with a sharp three-cornered tip, which is withdrawn after the instrument has been pushed into the cavity. The term trocar is usually applied to the rod with sharpened tip alone, the entire instrument being designated trocar and cannula.

Instrument for evacuating fluids from a cavity.

A surgical instr. for taking off fluids from parts of the body, as in dropsy.

Sharp-pointed instrument used with a cannula for tapping.

An instrument for drawing drawing off liquid from a cavity by puncture, consisting of a perforator and a cannula. [Fr.]