Dyonics, Inc.

Leonard J Bonnell

Lanny L Johnson

Douglas D Sjostrom

Edward H McHugh

Remote-cutting instrument formed by an inner tube rotating within an outer tube, in which an initial cutting point where portions of the tubes first come together during a cutting cycle is defined at the distal extremity of the sides of the tubes and cutting edges extend from this initial point longitudinally along the sides of the tubes. The coacting side edges of the tubes diverge in the proximal direction. There are end cutting edges of circular form, defining cusp-shaped points.

Surgical instrument

A surgical instrument useful in joint surgery for instance closed surgery of the knee. When in the form of a rotary vacuum shaver it comprises an external stationary tube having a side-facing, axially extending shaving port and an internal rotary blade capable of rotating at a slow speed, of the order of 200 rpm or below. Radial bearing portions at both proximal and distal ends radially support the blade in shearing relation to the external tube. A vacuum conduit draws fluid and articles to be shaved into the shaving port, and draws discrete shavings through the instrument, while the blade is driven at shearing speeds.

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Medford, MA, United States of America

Leonard J Bonnell