Apparatus for and method of measuring blood pressure

Patent metadata

Field	Value
Publication number	US-10405806-B2
Application number	US-201514961145-A
Country	US
Kind code	B2
Filing date	Dec 7, 2015
Priority date	Mar 6, 2015
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

An apparatus for and a method of measuring blood pressure are provided. The apparatus includes a sensor configured to radiate light to a body part, and detect a light signal that is changed due to the body part. The apparatus further includes a signal processor configured to determine a bio signal based on the light signal; and a central processing unit configured to determine a blood pressure based on the bio signal and a blood pressure estimation algorithm.

First claim

What is claimed is:

1. An apparatus configured to measure blood pressure, the apparatus comprising:
a sensor configured to radiate light to a body part, and detect a light signal that is changed due to the body part to which the light is radiated;
a signal processor configured to determine a bio signal, based on the light signal; and
a central processing unit configured to:
correct the bio signal;
extract feature points from the bio signal that is corrected;
input the feature points into an artificial neural network algorithm to learn a hidden layer matrix of the artificial neural network algorithm;
estimate a plurality of blood pressures as a product between the hidden layer matrix and a vector that is formed from the feature points;
extract one cycle of the bio signal that is corrected;
extract a systolic upstroke time interval and a diastolic time interval from the one cycle;
determine a linear relation equation of a blood pressure, from the plurality of blood pressures over the systolic upstroke time interval and the diastolic time interval; and
determine the blood pressure, based on the linear relation equation.

2. The apparatus of claim 1 , wherein the signal processor is further configured to:
extract a cycle of the light signal; and
sample data from the cycle of the light signal at equidistant time intervals or based on a user input.

3. The apparatus of claim 1 , wherein the signal processor is further configured to:
compare power spectrums within a frequency range of bio signals that are determined based on channels; and
select a channel having a maximum power spectrum from the channels.

4. The apparatus of claim 3 , wherein, the signal processor is further configured to, in response to the signal processor selecting the channel having the maximum power spectrum or using a single channel, select a part of a bio signal that corresponds to the channel that is selected or the single channel, in which a power spectrum value within the frequency range is greater than a value, as a valid part of the bio signal.

5. The apparatus of claim 1 , further comprising a display configured to display the blood pressure.

6. The apparatus of claim 1 , further comprising a memory configured to store a blood pressure estimation algorithm and information of the bio signal.

7. The apparatus of claim 1 , wherein the sensor comprises a light emitter configured to radiate the light to the body part, and a light receiver configured to detect the light signal that is changed due to the body part,
the light receiver comprises a photodiode or an image sensor, and
the light emitter comprises a laser diode or a light emitting diode.

8. The apparatus of claim 1 , wherein the sensor comprises a light emitter configured to radiate the light to the body part, and a light receiver configured to detect the light signal that is changed due to the body part,
the light emitter comprises a laser diode, and
the central processing unit is further configured to determine the blood pressure, based on the bio signal in response to the sensor being spaced apart from a skin of an examinee.

9. The apparatus of claim 1 , wherein the bio signal is periodically obtained at predetermined time intervals.

10. The apparatus of claim 1 , wherein the central processing unit is further configured to correct the blood pressure, based on another blood pressure that is determined by another device.

11. The apparatus of claim 1 , further comprising a body information interface configured to receive body information of at least one among an age, a gender, a weight, and a height of an examinee,
wherein the central processing unit is further configured to determine the blood pressure, based on the bio signal and the body information.

12. The apparatus of claim 1 , wherein the apparatus is portable, and is implemented in one among a wrist watch, a mobile smart phone, a tablet computer, an earphone, a headset, and glasses.

13. The apparatus of claim 1 , wherein the apparatus is implemented in a wrist watch, and
the sensor is positioned on a back of a main body or a strap of the wrist watch.

14. A method of measuring blood pressure, the method comprising:
radiating light to a body part;
detecting a light signal that is changed due to the body part to which the light is radiated;
determining a bio signal, based on the light signal;
correcting the bio signal;
extracting feature points from the bio signal that is corrected;
inputting the feature points into an artificial neural network algorithm to learn a hidden layer matrix of the artificial neural network algorithm;
estimating a plurality of blood pressures as a product between the hidden layer matrix and a vector that is formed from the feature points;
extracting one cycle of the bio signal that is corrected;
extracting a systolic upstroke time interval and a diastolic time interval from the one cycle;
determining a linear relation equation of the blood pressure, from the plurality of blood pressures over the systolic upstroke time interval and a diastolic time interval; and
determining the blood pressure, based on the linear relation equation.

15. The method of claim 14 , wherein the extracting comprises:
determining a maximum point of the bio signal that is corrected and a minimum point adjacent to the maximum point; and
extracting the feature points from the bio signal that is corrected at equidistant time intervals or based on a user input.

16. The method of claim 14 , wherein the correcting comprises:
correcting a baseline of a sequence of the bio signal; and
removing high frequency noise from the sequence that is corrected.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Baik Chanwook
• Kyoung Jisoo
• Riabko Maxim Vladimirovich
• Yoon Youngzoon
• Lantsov Alexey Dmitrievich
• Roh Younggeun
• Lee Jaesoong

Classifications

• A61B5/72

  Signal processing specially adapted for physiological signals or for diagnostic purposes · CPC title

• A61B5/02416

  using photoplethysmograph signals, e.g. generated by infrared radiation (A61B5/14552 takes precedence) · CPC title

• A61B5/14552

  Details of sensors specially adapted therefor · CPC title

• A61B5/6824

  Arm or wrist · CPC title

• A61B2562/0233

  Special features of optical sensors or probes classified in A61B5/00 · CPC title