Patent ID: 9572551
Date: 2017-02-21
CPC Classifications: A61B

Claim:
1. Biopsy trocar for performing bone marrow biopsies, comprising: a biopsy needle having a cannula; and a mandrel having a shaft, the shaft being suitable for sliding in the biopsy needle, wherein: the cannula has, at its distal end, at least one internal rib forming a helix portion on the internal wall of the cannula, the axis of the helix portion of at least a part of the apex of the internal rib is off-centred with respect to the axis of the cannula, the diameter of the apex of the helix of the internal rib is greater than the internal diameter of the cannula, the shaft has at least one helical groove cooperating with the internal rib, the internal rib being suitable for retaining a sample of marrow in the needle.