Patent ID: 6330464
Filing Date: 2001-12-11
Classification: A61B,G01N,Y10S

Abstract:
An optical-based sensor for determining the presence or concentration of an analyte in a medium, said sensor comprising:an optically transmissive sensor body which function as an optic wave guide, said sensor body having an outer surface surrounding said sensor body;a radiation source in said sensor body which emits radiation within said sensor body;an indicator element having an optical characteristic that is affected by the presence or concentration of an analyte, said indicator element being positioned on said sensor body to receive radiation that travels from said radiation source, and which transmits radiation into said sensor body;a photosensitive element located in said sensor body and positioned to receive radiation within the sensor body and which emits a signal responsive to radiation received from said indicator element; andsaid sensor body being configured such that some of the radiation received by said photosensitive element is reflected internally within said sensor body before striking said photosensitive element.