Apparatus for and method of monitoring blood pressure and wearable device having function of monitoring blood pressure
First Claim
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1. An apparatus for monitoring a blood pressure, the apparatus comprising:
- a laser emitter configured to emit a laser towards a blood vessel in a body part using at least one laser diode device to oscillate the laser;
a speckle detector configured to detect, from the body part, laser speckles caused by scattering of the laser that is emitted and reflected from the body part; and
a controller configured to obtain a bio-signal indicating a change in a volume of the blood vessel from the laser speckles and estimate the blood pressure based on the obtained bio-signal,wherein the speckle detector comprises a plurality of photodetecting devices,wherein the controller is configured to select a photodetecting device having a highest detection sensitivity, from among the plurality of photodetecting devices, and estimate the blood pressure based on the laser speckles detected by the photodetecting device that is selected,wherein the detection sensitivity corresponds to a change in an intensity of an optical signal corresponding to a speckle fluctuation of the laser speckles that is received by the speckle detector,wherein a number of the photodetecting devices for detecting the laser speckles caused by the at least one laser diode device is more than a number of the at least one laser diode device, andwherein each of the plurality of photodetecting devices are packaged around the at least one laser diode device.
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Abstract
A method of monitoring a blood pressure includes: emitting a laser to a blood vessel in a body part; detecting, from the body part, laser speckles caused by scattering of the emitted laser; obtaining a bio-signal indicating a change in a volume of the blood vessel by using the detected laser speckles; and estimating a blood pressure based on the obtained bio-signal.
135 Citations
17 Claims
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1. An apparatus for monitoring a blood pressure, the apparatus comprising:
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a laser emitter configured to emit a laser towards a blood vessel in a body part using at least one laser diode device to oscillate the laser; a speckle detector configured to detect, from the body part, laser speckles caused by scattering of the laser that is emitted and reflected from the body part; and a controller configured to obtain a bio-signal indicating a change in a volume of the blood vessel from the laser speckles and estimate the blood pressure based on the obtained bio-signal, wherein the speckle detector comprises a plurality of photodetecting devices, wherein the controller is configured to select a photodetecting device having a highest detection sensitivity, from among the plurality of photodetecting devices, and estimate the blood pressure based on the laser speckles detected by the photodetecting device that is selected, wherein the detection sensitivity corresponds to a change in an intensity of an optical signal corresponding to a speckle fluctuation of the laser speckles that is received by the speckle detector, wherein a number of the photodetecting devices for detecting the laser speckles caused by the at least one laser diode device is more than a number of the at least one laser diode device, and wherein each of the plurality of photodetecting devices are packaged around the at least one laser diode device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A wearable device configured to monitor a blood pressure, the wearable device comprising:
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at least one blood pressure monitoring module configured to measure a blood pressure of a user; a user interface module configured to provide information about the blood pressure; and a processor that controls the at least one blood pressuring monitoring module and the user interface module, wherein each of the at least one blood pressure monitoring module comprises; a laser emitter configured to emit a laser towards a blood vessel in a body part using at least one laser diode device to oscillate the laser; a speckle detector configured to detect, from the body part, laser speckles caused by scattering of the laser that is emitted laser and reflected from the body part; and a controller configured to obtain a bio-signal indicating a change in a volume of the blood vessel from the laser speckles and estimate the blood pressure based on the obtained bio-signal, wherein the speckle detector comprises a plurality of photodetecting devices, wherein the controller is configured to select a photodetecting device having a highest detection sensitivity, from among the plurality of photodetecting devices, and estimate the blood pressure based on the laser speckles detected by the photodetecting device that is selected, wherein the detection sensitivity corresponds to a change in an intensity of an optical signal corresponding to a speckle fluctuation of the laser speckles that is received by the speckle detector, wherein a number of the photodetecting devices for detecting the laser speckles caused by the at least one laser diode device is more than a number of the at least one laser diode device, and wherein each of the plurality of photodetecting devices are packaged around the at least one laser diode device. - View Dependent Claims (13, 14)
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15. A method of monitoring a blood pressure, the method comprising:
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emitting a laser towards a blood vessel in a body part using at least one laser diode device of a laser emitter to oscillate the laser; detecting by using a speckle detector, from the body part, laser speckles caused by scattering of the laser emitted and reflected from the body part; obtaining a bio-signal indicating a change in a volume of the blood vessel from the detected laser speckles; and estimating the blood pressure based on the obtained bio-signal, wherein the speckle detector comprises a plurality of photodetecting devices, wherein the estimating comprises selecting a photodetecting device having a highest detection sensitivity, from among the plurality of photodetecting devices, and estimating the blood pressure based on the laser speckles detected by the photodetecting device that is selected, and wherein the detection sensitivity corresponds to a change in an intensity of an optical signal corresponding to a speckle fluctuation of the laser speckles that is received by the speckle detector, wherein a number of the photodetecting devices for detecting the laser speckles caused by the at least one laser diode device is more than a number of the at least one laser diode device, and wherein each of the plurality of photodetecting devices are packaged around the at least one laser diode device. - View Dependent Claims (16, 17)
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Specification