Disposable calibration boot for optical-type cardiovascular cath

Details Disposable calibration boot for optical-type cardiovascular cath Disposable calibration boot for optical-type cardiovascular cath

1986-12-08

1988-05-17

Laroche, Eugene R.

Optics: measuring and testing

Standard

356 41, 356 42, G01J 102

Patent

active

047446560

ABSTRACT:
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.

REFERENCES:
patent: 4050450 (1977-09-01), Polanyi et al.
patent: 4322164 (1982-03-01), Shaw et al.
patent: 4650327 (1987-03-01), Ogi

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