System and method for blood typing using PPG technology
First Claim
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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.
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Abstract
A biosensor identifies a blood type using photoplethysmography (PPG) technology. A PPG circuit obtains a plurality of spectral responses at a plurality of wavelengths detected from skin of a user. A processing circuit determines a blood factor indicator using the plurality of spectral responses. The blood factor indicator may include a signal quality parameter or a ratio R value. A calibration database includes a correlation of the blood factor indicator to a plurality of blood types. The blood blood type of the user is identified using the blood factor indicator and the calibration database.
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Citations
19 Claims
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1. A biosensor, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A biosensor, comprising:
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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 signal quality parameter of at least one of the plurality of spectral responses; determine a blood factor indicator using the signal quality parameter; access a calibration database that associates the blood factor indicator to a plurality of blood types; and identify a blood type of the user using the blood factor indicator and the calibration database. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification