1
Robert D Rosenthal: Instrument for non-invasive measurement of blood glucose. Futrex, Rothwell Figg Ernst & Kurz, December 31, 1991: US05077476 (503 worldwide citation)

Near-infrared quantitative analysis instruments non-invasively measure blood glucose by analyzing near-infrared energy following interactance with venous or arterial blood, or transmission through a blood containing body part. A replaceable cartridge stores data unique to an individual patient/user. ...


2
Vladimir Kupershmidt: Pocket-type instrument for non-invasive measurement of blood glucose concentration. Sunshine Medical Instruments, Davis Hoxie Faithfull & Hapgood, March 21, 1995: US05398681 (121 worldwide citation)

A pocket-type apparatus for non-invasive measurement of blood glucose concentration based on producing a polarized-modulated laser beam via an optical phase shifter (32), measuring a phase difference introduced, e.g., by a finger (F) or a ear lobule (E) of a subject, measuring phase difference betwe ...