Sensor device and method for measuring and determining a pulse arrival time (PAT) value
First Claim
1. A method for measuring and determining a single pulse arrival time (PAT) value at a given location of a user, wherein the PAT value is the time for a pulse to arrive at said location following a contraction of the heart of the user, using a sensor device comprising a photoplethysmographic (PPG) multichannel sensor formed from a plurality of PPG sensor channels and being adapted to measure a set of PPG signals, each PPG signal being measured by one of the PPG sensor channels when the multichannel PPG sensor is in contact with the user;
- comprising;
measuring noninvasively said set of PPG signals;
extracting a plurality of features from each of the measured PPG signals;
selecting a subset from the set of PPG signals based on the extracted features; and
processing the selected subset of PPG signals to noninvasively determine the PAT value,wherein said selecting the subset of PPG signals comprises;
projecting the plurality of features extracted from each of the measured PPG signal into a set of points in a N-dimensional feature space where N corresponds to the number of extracted features for each PPG signal;
clustering the set of points according to a distance criterion; and
selecting points being located at a representative cluster, the selected points corresponding to the subset of PPG signals.
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Accused Products
Abstract
A method for measuring and determining a pulse arrival time (PAT) value of a user using a sensor device having a photoplethysmographic (PPG) multichannel sensor formed from a plurality of PPG sensor channels and being adapted to measure a set of PPG signals, each PPG signal being measured by one of the PPG sensor channels when the multichannel PPG sensor is in contact with the user; having: measuring the set of PPG signals; extracting a plurality of features from each of the measured PPG signals; selecting a subset from the set of PPG signals based on the extracted features; and processing the selected subset of PPG signals to determine the PAT value. The disclosed sensor and method can be embedded into a chest belt and do not need skilled supervision. They can represent a potential candidate for the implantation of PWV measurement campaigns in the ambulatory setting.
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Citations
16 Claims
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1. A method for measuring and determining a single pulse arrival time (PAT) value at a given location of a user, wherein the PAT value is the time for a pulse to arrive at said location following a contraction of the heart of the user, using a sensor device comprising a photoplethysmographic (PPG) multichannel sensor formed from a plurality of PPG sensor channels and being adapted to measure a set of PPG signals, each PPG signal being measured by one of the PPG sensor channels when the multichannel PPG sensor is in contact with the user;
- comprising;
measuring noninvasively said set of PPG signals; extracting a plurality of features from each of the measured PPG signals; selecting a subset from the set of PPG signals based on the extracted features; and processing the selected subset of PPG signals to noninvasively determine the PAT value, wherein said selecting the subset of PPG signals comprises; projecting the plurality of features extracted from each of the measured PPG signal into a set of points in a N-dimensional feature space where N corresponds to the number of extracted features for each PPG signal; clustering the set of points according to a distance criterion; and selecting points being located at a representative cluster, the selected points corresponding to the subset of PPG signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- comprising;
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13. A sensor device for measuring and determining noninvasively a pulse arrival time (PAT) value at a given location of a user, wherein the PAT value is the time for a pulse to arrive at said location following a contraction of the heart of the user, the sensor device comprising a photoplethysmographic (PPG) multichannel sensor formed from a plurality of PPG sensor channels and being adapted to measure a set of PPG signals, each PPG signal being measured by one of the PPG sensor channels when the multichannel PPG sensor is in contact with the user, wherein the sensor device is configured to determine the PAT value by:
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measuring noninvasively said set of PPG signals; extracting a plurality of features from each of the measured PPG signals; selecting a subset from the set of PPG signals based on the extracted features; and processing the selected subset of PPG signals to noninvasively determine the PAT value, wherein said selecting the subset of PPG signals comprises; projecting the plurality of features extracted from each of the measured PPG signal into a set of points in a N-dimensional feature space where N corresponds to the number of extracted features for each PPG signal; clustering the set of points according to a distance criterion; and selecting points being located at a representative cluster, the selected points corresponding to the subset of PPG signals. - View Dependent Claims (14, 15)
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16. A non-transitory computer readable medium comprising program code portions to be executed by a signal processing device in order to carry out a method for measuring and determining noninvasively a single pulse arrival time (PAT) value of a user, wherein the PAT value is the time for a pulse to arrive at a given location following a contraction of the heart of the user, using a sensor device comprising a photoplethysmographic (PPG) multichannel sensor formed from a plurality of PPG sensor channels and being adapted to measure a set of PPG signals, each PPG signal being measured by one of the PPG sensor channels when the multichannel PPG sensor is in contact with the user;
- the method comprising;
measuring noninvasively said set of PPG signals; extracting a plurality of features from each of the measured PPG signals; selecting a subset from the set of PPG signals based on the extracted features; and processing the selected subset of PPG signals to noninvasively determine the PAT value; when said program is executed by said signal processing device, wherein said selecting the subset of PPG signals comprises; projecting the plurality of features extracted from each of the measured PPG signal into a set of points in a N-dimensional feature space where N corresponds to the number of extracted features for each PPG signal; clustering the set of points according to a distance criterion; and selecting points being located at a representative cluster, the selected points corresponding to the subset of PPG signals.
- the method comprising;
Specification