US Patent No. 10,039,500


Patent No. 10,039,500
Issue Date August 07, 2018
Title System And Method For Blood Typing Using Ppg Technology
Inventorship Robert Steven Newberry, New Hope, AL (US)
Assignee Sanmina Corporation, San Jose, CA (US)

Claim of US Patent No. 10,039,500

1. A biosensor, comprising:a photoplethysmography (PPG) circuit configured to obtain a plurality of spectral responses at a plurality of wavelengths detected from skin of a user;
a processing circuit configured to:
determine a first ratio R value using a first spectral response and a second spectral response of the plurality of spectral responses, wherein the first ratio R value is determined from a ratio of alternating current (AC) signal components in the first spectral response and the second spectral response and varies based on one or more of a plurality of types of antigens on surfaces of red blood cells in a blood stream of the user;
access a calibration database stored in a memory that associates predetermined ratio R values to the plurality of types of antigens on the surfaces of red blood cells; and
identify a blood type of the user using the first ratio R value and the calibration database.