Bone marrow needle

Claim 1

A bone marrow biopsy needle assembly, comprising: (a) an elongated tubular cannula having an axially extending bore therethrough; (b) a cannula handle positioned on the proximal end of said cannula; wherein (c) said cannula handle extends perpendicularly to the axis of said cannula; and wherein (d) said cannula handle is comprised of two equal rectangular halves extending in diametrically opposed directions to each other from said cannula axis; (e) each of said equal halves of said cannula handle having proximally extending shoulder projections substantially parallel to the axis; (f) an orifice in said cannula handle in flow communication with said cannula bore, said orifice being coaxial with said cannula bore; (g) a stylus handle removably positioned on the proximal end of said cannula handle; wherein (h) said stylus handle extends perpendicularly to the axis of said cannula and includes an elongated palm contacting surface on the proximal side thereof; and wherein (i) said stylus handle is comprised of two equal rectangular halves extending in diametrically opposed directions to each other from said cannula axis along the same diameter and substantially to the same extent as said equal halves of said cannula handle; (j) an elongated stylus extending from the distal side of said stylus handle and slidably received within said cannula bore, said stylus having a sharpened distal tip which extends distally from the distal end of said cannula; (k) and wherein the distal side of said stylus handle further includes recess means mated to the shouldered projections for allowing relative movement between the stylus and cannula handles only in the axial direction of said cannula; (l) whereby when said equal cannula handle halves are received in said recesses of said equal stylus handle halves, force may be rotatingly applied around either axial direction of said elongated stylet positioned in said elongated cannula without relative rotation of said elongated stylet and said elongaed cannula;