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plural trocars
A pointed hollow cylindrical device used to make small incisions and surgically insert cannulas, etc., into body cavities, or to aspirate fluids. quotations examples
He wheeled his first patient over to the operating room […] and began pulling out the marrow, plunging a steel trocar repeatedly into the hip and drawing out the cells.
2010, Siddhartha Mukherjee, The Emperor of All Maladies, Fourth Estate (2011), page 313