A biopsy needle scrapes tissue of cellular size from a lesion during repeated
proximal-to-distal
thrusts of the needle along its longitudinal axis of symmetry. A first sharp edge,
formed by a beveled distal end of the needle, scrapes tissue during proximal-to-distal
travel of the needle. A second sharp edge is provided by a transversely disposed
slot formed in the needle near the first sharp edge. The second sharp edge also
scrapes tissue during proximal-to-distal travel of the needle. The second sharp
edge may be coincident with an exterior surface of the needle, elevated with respect
to the exterior surface, or recessed with respect to the exterior surface. Another
embodiment includes a hinge for enabling pivotal movement of the second sharp edge.
