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Systems and methods for non-pulsatile blood volume measurement

A technology of blood information and users, applied in the direction of measuring pulse rate/heart rate, diagnostic recording/measurement, application, etc.

Active Publication Date: 2021-08-17
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Non-pulsatile blood volume changes can be measured using at least one set of light emitter-light sensors

Method used

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  • Systems and methods for non-pulsatile blood volume measurement
  • Systems and methods for non-pulsatile blood volume measurement
  • Systems and methods for non-pulsatile blood volume measurement

Examples

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Embodiment Construction

[0061] In the following description of the examples, reference is made to the accompanying drawings, in which are shown by way of illustrations specific examples that may be practiced. It is to be understood that other examples may be utilized and structural changes may be made without departing from the scope of the respective examples.

[0062] The present invention relates to systems and methods for determining one or more of a user's physiological signals. The one or more of the user's physiological signals may be determined by measuring changes in pulsatile blood volume. By measuring non-pulsatile blood volume changes and adjusting the signal to account for non-pulsatile blood information, motion artifacts included in these signals can be eliminated or reduced. The user's deeper tissues may be more susceptible to motion artifacts due to the presence of, for example, muscle motion, tendon motion, non-pulsatile blood motion, or combinations thereof. There are no muscles a...

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Abstract

The present invention relates to systems and methods for determining one or more of a user's physiological signals. One or more of the user's physiological signals may be determined by measuring pulsatile blood volume changes. Motion artifacts included in the signal can be canceled or reduced by measuring the non-pulsatile blood volume change and adjusting the signal to account for the non-pulsatile blood information. Non-pulsatile blood volume changes may be measured using at least one set of light emitters - light sensors. The light emitters may be placed in close proximity (e.g., less than or equal to 1 mm) to the vicinity of the light sensor, thereby limiting light emitted by the light emitters to the blood volume from interfering with one or more blood vessels and / or arteries. effect. In some examples, the system can further include an accelerometer configured to measure acceleration of the user, and the acceleration signal can additionally be used to compensate for motion artifacts.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application 62 / 334,363, filed May 10, 2016, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates generally to an architecture for a PPG system, and more particularly, to a PPG system capable of generating signals including information about barely pulsatile blood and capable of measuring non-pulsatile blood volume changes. Background technique [0004] Physiological signals of the user (eg, pulse rate or arterial oxygen saturation) may be determined by a photoplethysmography (PPG) system. In basic form, a PPG system may employ one or more light sources to illuminate the user's tissue and one or more light detectors to receive light entering and detect subsurface volumes of the tissue. The light source and light detector may be in contact with the tissue, or may be remote (ie, not in contact) with the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/00A61B5/024A61B5/1455
CPCA61B5/7214A61B5/02427A61B5/02438A61B5/14552A61B5/02433A61B5/681A61B5/6898A61B5/721A61B5/0261A61B5/0205A61B5/0295A61B5/11A61B5/6843A61B5/7264A61B2562/0219A61B2562/0238A61B2562/046A61B2562/146A61B2562/185
Inventor N·P·J·阿莱克R·帕特森U·L·布洛克V·万努古帕尔
Owner APPLE INC
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