Bone marrow biopsy needle with cutting and/or retaining device at distal end

摘要

A bone marrow biopsy needle provided with blades which cut and retain a biopsy core. In one embodiment, the blades of the needle are hinged. In a further embodiment, the cutting blades are provided at the end of an inner tube which travels within an outer tube. In one embodiment, the outer tube is tapered at its distal end to push the blades together. In another embodiment, the cutting blade is pre-curved inward. In yet another embodiment, the distal ends of the cutting blades rest within a curved circumferential recess provided in the needle wall, and, when pushed forward, come together to cut and retain the biopsy core.