Noncontact monitoring of blood oxygen saturation using camera
First Claim
1. A device for non-contact measurement of blood oxygen saturation (SpO2) in a human subject having a face, comprising:
- a camera;
a microcontroller;
an illumination system, coupled to receive control signals from the microcontroller, consisting of a first LED array placed proximate the left side of the camera and a second LED array symmetrically placed proximate the right side of the camera each of the first and second LED arrays having a first plurality of rows of NIR LEDs emitting near infrared (NIR) light, and a second plurality of rows of orange LEDs emitting orange light alternating with the first plurality of rows of NIR LEDs, where the first and second LED arrays are located in optical paths adapted to transmit reflected light from the face to the camera;
wherein the microcontroller is connected to the first and second LED arrays to generate control signals for alternately switching the NIR LEDs and orange LEDs on and off for both the first and second LED arrays;
wherein the microcontroller is also coupled to transmit a camera trigger to the camera, where the camera generates video signal values sensed from the reflected light where the reflected light includes pulsatile components and non-pulsatile components;
a processor for receiving the video signal values from the camera; and
wherein the processor determines SpO2 values that are proportional to the ratios of the absorbance of the NIR LEDs and the orange LEDs as transmitted in the reflected light.
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Accused Products
Abstract
A device for non-contact measurement of blood oxygen saturation (SpO2) in a mammalian subject including a camera and one or more arrays of LEDs each having a first set of LEDs emitting near infrared (NIR), and the second set of LEDs emitting orange light located in an optical path adapted to transmit reflected light from a subject to the camera. A controller transmits a camera trigger to the camera, and is further coupled to transmit control signals to the one or more arrays of LEDs. A processor receives photoplethysmography (PPG) data signal values from the camera. The PPG data signal values are present in the reflected light and include pulsatile and non-pulsatile components. The processor determines SpO2 values from the PPG data signal values from the measured ratios of pulsatile to non-pulsatile components of the PPG signals.
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Citations
12 Claims
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1. A device for non-contact measurement of blood oxygen saturation (SpO2) in a human subject having a face, comprising:
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a camera; a microcontroller; an illumination system, coupled to receive control signals from the microcontroller, consisting of a first LED array placed proximate the left side of the camera and a second LED array symmetrically placed proximate the right side of the camera each of the first and second LED arrays having a first plurality of rows of NIR LEDs emitting near infrared (NIR) light, and a second plurality of rows of orange LEDs emitting orange light alternating with the first plurality of rows of NIR LEDs, where the first and second LED arrays are located in optical paths adapted to transmit reflected light from the face to the camera; wherein the microcontroller is connected to the first and second LED arrays to generate control signals for alternately switching the NIR LEDs and orange LEDs on and off for both the first and second LED arrays; wherein the microcontroller is also coupled to transmit a camera trigger to the camera, where the camera generates video signal values sensed from the reflected light where the reflected light includes pulsatile components and non-pulsatile components; a processor for receiving the video signal values from the camera; and wherein the processor determines SpO2 values that are proportional to the ratios of the absorbance of the NIR LEDs and the orange LEDs as transmitted in the reflected light. - View Dependent Claims (2, 3, 4, 5)
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6. A method for non-contact measurement of blood oxygen saturation (SpO2) in a human subject having a face, comprising:
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locating an illumination system consisting of a first LED array and a second LED array placed respectively on the left and right sides of a camera each of the first and second LED arrays having alternating rows of NIR LEDs emitting near infrared (NIR), and orange LEDs emitting orange light in an optical path adapted to transmit reflected light from the face to the camera; transmitting reflected light from the face to the camera by alternately illuminating the NIR LEDs and orange LEDs for both the first and second LED arrays; operating the camera to capture the reflected light to produce a plurality of video signal values; processing the video signal values from the camera, wherein the video signal values include pulsatile components and non-pulsatile components; and determining SpO2 values from the video signal values as proportional to the ratios of the absorbance of the NIR light and the orange light after they are emitted from the first and second LED arrays and then reflected from the face. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification