Smith & Nephew Dyonics, Inc.

Randal B Chinnock

Norman J Dionne

Arthur Shoemaker

A lens surrounded by a protective chamber is focused by utilizing a magnetic field to adjust the position of the lens within the chamber. By using a magnetic field to adjust the lens position, it is not necessary to pass a mechanical device through the surface of the chamber, thereby allowing the chamber to be completely sealed to prevent contaminants from contacting the lens.

Magnetically coupled lens actuator

The present invention provides a videoarthroscope which is longitudinally compact so tht it can be held and controlled with one hand. the videoarthroscope of the present invention includes a needle assembly and a focusing assembly rotatable relative to each other to permit rotation of the needle tip. The focusing assembly includes a rotatable focusing ring. All confronting rotating surfaces are sealed by a multilobed seal and provided with a lubricant to promote both ease of movement and sealing of movable joints. The videoarthroscope includes in its optical assembly a movable focusing group comprised of two lenses and an optional fixed telescope lens.

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North Reading, MA, United States of America

Randal B Chinnock