trocar

A sharp-pointed surgical instrument, used with a cannula to puncture a body cavity for fluid aspiration.

A surgical instrument used for withdrawing fluid from the body in cases of dropsy, hydrocele, etc.

A stylet, usually with a triangular point, used for exploring tissues or for inserting drainage tubes, as in dropsy.

A pointed hollow cylindrical device used to make small incisions and surgically insert cannulas, etc., into body cavities, or to aspirate fluids.