Importance

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Abstract

An elongated hollow biopsy needle assembly which includes a cannula, a stylet arranged to be received within the cannula, a finger-gripping means, and coupling means for orienting the stylet within the cannula and for releasably securing both the cannula and the stylet to the finger-gripping means. The cannula is provided with a generally cylindrical hub which has a bore extending axially thereof, and generally in continuation with the bore of the cannula, with a conical syringe receiving counterbore being formed within the proximal end of the hub. The stylet is provided with a cap member, with the distal-facing surface of the cap being arranged to fit snugly against the proximal-facing surface of the cylindrical hub, to achieve substantially closed symmetrical mating end surfaces between the cannula and stylet, and a substantially air-tight cannula. The distal end of the cannula terminates along a plane disposed at a certain acute angle relative to the axis of the cannula, and the distal end of the stylet terminates along a plane disposed at the same angle relative to its axis. In order to achieve orientation of the stylet relative to the cannula, a groove is formed along the proximal end of the stylet, and the cap is provided with an inwardly extending tongue arranged to mate with the stylet groove, thereby achieving positive orientation of the stylet relative to the cannula.

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First Claim