Patent ID: 6711423
Filing Date: 2004-03-23
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 enclosed 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 comprising indicator molecules contained within a liquid polymeric matrix, and 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; and said 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.