Waters Instruments, Inc.

Berkley & Company, Inc.

Carl W Tretinyak

Thomas A Burton

A bone marrow needle has a cannula (12) connected to a cannula handle portion (18) extending equal distances from the axis of the cannula bore. A stylet (14) is slidably positioned into the cannula with its stylet handle (16) matingly receiving the proximal projections (18.4, 18.5) of the cannula handle portion into recess (16.6), thus preventing relative rotational movement of the cannula and stylus during use. Proximal projections (18.4, 18.5) define a space therebetween for a syringe connector (12.3) that enables aspiration through the cannula after insertion into the bone.

Bone marrow needle

A biopsy needle having a cannula with a sharpened distal end and a stylet received coaxially in the cannula and having a sharpened distal end protruding from the distal end of the cannula. The distal ends of the stylet, the cannula, or both, are provided with particular cutting edge configurations enabling the needle to more readily penetrate bone.

Biopsy needle

A syringe having a barrel and a plunger moveable axially in the barrel is provided with locking means for locking the plunger to the barrel. The locking means includes cam means carried between the barrel and the plunger, and means for moving the cam into a position forcing the plunger into binding contact with the barrel.

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Rochester, MN, United States of America

Carl W Tretinyak