Methods, Systems and Devices for Measuring Fingertip Heart Rate
First Claim
1. An activity tracking device, comprising,a housing, the housing including:
- a motion sensor and a processor, the processor configured for processing motion data produced by the motion sensor;
a display screen integrated with the housing to display metrics that quantify the motion data produced by the motion sensor;
a light source integrated within the housing to enable light to be directed out of the housing at a heart rate monitor location on the housing; and
a light detector integrated within the housing, the light detector configured to capture an amount of the light that is reflected back to the light detector, at least a first portion of the light reflected back to the light detector is reflected from a blood vessel under a skin of a user when the user places the skin over the heart rate monitor location on the housing, the processor further being in communication with the light detector to enable processing of the reflected light, the processing configured to identify heart beats of the user and produce an indication of a heart rate, the indication of the heart rate being displayable on the display screen as an option, in addition to the metrics that quantify the motion data, the processor including computer executable instructions for measuring a baseline reflectance signal of the light reflected from the blood vessel between each one of a plurality of heart beats and for detecting a second reflectance signal corresponding to at least one heart beat in the blood vessel, the second reflectance signal being less than the baseline reflectance signal, where the blood vessel scatters more of the light during the at least one heart beat than between each one of the plurality of heart beats.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method of tracking activity includes a motion sensor, a light source and a light detector. The light detector is configured to capture an amount of the light that is reflected back to the light detector, at least a first portion of the light reflected back to the light detector is reflected from a blood vessel disposed under a skin of a user when the user places the skin over the heart rate monitor location on the housing. A processor is in communication with the motion sensor and the light detector and can process the reflected light to identify heart beats of the user and produce an indication of a heart rate. The indication of the heart rate can be displayed on the display screen as an option, in addition to the metrics that quantify the motion data.
-
Citations
30 Claims
-
1. An activity tracking device, comprising,
a housing, the housing including: -
a motion sensor and a processor, the processor configured for processing motion data produced by the motion sensor; a display screen integrated with the housing to display metrics that quantify the motion data produced by the motion sensor; a light source integrated within the housing to enable light to be directed out of the housing at a heart rate monitor location on the housing; and a light detector integrated within the housing, the light detector configured to capture an amount of the light that is reflected back to the light detector, at least a first portion of the light reflected back to the light detector is reflected from a blood vessel under a skin of a user when the user places the skin over the heart rate monitor location on the housing, the processor further being in communication with the light detector to enable processing of the reflected light, the processing configured to identify heart beats of the user and produce an indication of a heart rate, the indication of the heart rate being displayable on the display screen as an option, in addition to the metrics that quantify the motion data, the processor including computer executable instructions for measuring a baseline reflectance signal of the light reflected from the blood vessel between each one of a plurality of heart beats and for detecting a second reflectance signal corresponding to at least one heart beat in the blood vessel, the second reflectance signal being less than the baseline reflectance signal, where the blood vessel scatters more of the light during the at least one heart beat than between each one of the plurality of heart beats. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
-
25. A method of tracking activity, comprising,
sensing motion with a motion sensor, the motion sensor including a processor, the processor configured for processing motion data produced by the motion sensor; -
displaying metrics that quantify the motion data produced by the motion sensing, the metrics being displayed on a device display screen integrated with a housing of the motion sensor; directing light emitted from a light source, the light source being included in the housing at a heart rate monitor location on the housing; and capturing an amount of the light that is reflected back to a light detector, the light detector integrated within the housing, at least a first portion of the light reflected back to the light detector is reflected from a blood vessel disposed under a skin of a user when the user places the skin over the heart rate monitor location on the housing, the processor further being in communication with the light detector to enable processing of the reflected light, the processing configured to identify heart beats of the user and produce an indication of a heart rate, the indication of the heart rate being displayable on the display screen as an option, in addition to the metrics that quantify the motion data, wherein identifying heart beats includes measuring a baseline reflectance signal of the light reflected from the blood vessel between each one of the heart beats and for detecting a second reflectance signal corresponding to at least one heart beat in the blood vessel, the second reflectance signal being less than the baseline reflectance signal, where the blood vessel scatters more of the light during the at least one heart beat than between each one of the heart beats. - View Dependent Claims (26, 27, 28)
-
-
29. A heart rate monitor comprising:
-
a light source; a light detector disposed to receive light emitted from the light source and reflected from a blood vessel disposed within in a heart rate monitor subject; a display screen; and a processor coupled to the light source, the light detector and the display screen, the controller including memory and processor including computer executable instructions for; detecting a plurality of heart beats in the light received in the light detector within a sampling time period including measuring a baseline reflectance signal of the light reflected from the blood vessel between each one of the heart beats and for detecting a second reflectance signal corresponding to at least one heart beat in the blood vessel, the second reflectance signal being less than the baseline reflectance signal, where the blood vessel scatters more of the light during the at least one heart beat than between each one of the heart beats; measuring a first time interval between a first beat of the detected plurality of heart beats and a second beat of the detected plurality of heart beats; dividing the sampling time period by the first time interval to determine a first estimate of beats detected within the sampling time period; extrapolating the first estimate of beats within the sampling time period to a first estimated beats per minute; and outputting the first estimate beats per minute to the display screen.
-
-
30. An activity tracking device, comprising,
a housing, the housing including: -
a motion sensor and a processor, the processor configured for processing motion data produced by the motion sensor; a display screen integrated with the housing to display metrics that quantify the motion data produced by the motion sensor; a light source integrated within the housing to enable light to be directed out of the housing at a heart rate monitor location on the housing; and a light detector integrated within the housing, the light detector configured to capture an amount of the light that is reflected back to the light detector, at least a first portion of the light reflected back to the light detector is reflected from a blood vessel disposed under a skin of a user when the user places the skin over the heart rate monitor location on the housing, the processor further being in communication with the light detector to enable processing of the reflected light, the processing configured to identify heart beats of the user and produce an indication of a heart rate, the indication of the heart rate being displayable on the display screen as an option, in addition to the metrics that quantify the motion data, wherein the heart rate is calculated based on an algorithm that; calculates a first estimate of heart beats per minute corresponding to detected plurality of heart beats in the light received in the light detector within a sampling time period; calculates a refined estimate of heart beats per minute; and identifies and filters at least one falsely detected heart beat coinciding with motion detected by the motion sensor.
-
Specification