Spectramed, Inc.

Mendelson, Yitzhak

Byron L Moran

Allan F Willis

The catheter tip fits into a cavity in the boot and is held gently (in the longitudinal direction) by a detent formed within the cavity. A calibration substance faces the tip in a mechanically and optically standardized calibration relationship, to reflect light from within the catheter back into the catheter. The calibration substance is held in constant, precise contact with the tip--but passively, not by springs or other longitudinally forcible devices but by close fit between the tip and the precision-molded internal surfaces of the cavity. In the lateral direction the boot may tightly grip the tip, at a point where the optic fibers are protected against such force. To provide a reflection standard for calibration, the calibration substance is of standardized character and quality: it is preferably a homogeneous suspension of reflecting particles in translucent or transparent polymer. The entire boot is preferably compression- or injection-molded from the calibration substance, except for a rigid, opaque outer skin. The catheter is shipped to a customr with the boot in place, ready for calibration on receipt or whenever thereafter the catheter is to be used. After calibration the boot is removed and discarded.

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Worcester, MA, United States of America

Mendelson, Yitzhak