The invention relates to a biopsy trocar (1) for performing bone marrow biopsies. The trocar includes a biopsy needle (2) comprising a cannula (4) and a mandrel (3) comprising an axis (6), the axis (6) being adapted to slide in the biopsy needle (2). The cannula (4) has at its distal end at least one internal rib (12, 21) forming a helical portion on the inner wall of the cannula (4), and the axis (6) has a helical groove (16). 26) which can cooperate with the internal rib (12, 21).
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