KR20180033018A - Wrist watch typed blood pressure measuring device using korotkoff sound - Google Patents

Abstract

According to the present invention, a wrist wearable manometer comprises: a pressurizing plate including an air pocket and a body surrounding a wrist; a piezo sensor sensing a Korotkoff sound when the air pocket is pressurized; and a control unit for processing a signal sensed by the piezo sensor to measure blood pressure. Accordingly, a blood pressure value is provided by detecting the Korotkoff sound in a wrist radial artery, and a reliable blood pressure measurement is possible by applying a noise removal algorithm and a correction algorithm to detect a micro Korotkoff sound in the wrist radial artery.

Description

[0001] WRIST WATCH TYPE BLOOD PRESSURE MEASURING DEVICE USING KOROTKOFF SOUND [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wrist blood pressure monitor using a Korotkoff sound, and more particularly to a wrist blood pressure monitor using a piezoelectric film sensing technique.

Blood pressure is the pressure applied to the blood vessel wall by the blood ejected from the vascular system circuit by the pumping action of the heartbeat. The blood pressure measurement method is known as a direct method of measuring a blood pressure by inserting a needle or a catheter into a blood vessel and an indirect method of measuring a blood pressure using a pressure change of a cuff wound on the upper arm.

The direct method is not used to measure blood pressure simply because it is necessary to invade the human body with a blood pressure measuring device, and it is used in special situations such as intensive care monitoring or surgery. Therefore, the blood pressure measurement by the indirect method is general, and the blood pressure measurement by the indirect method is performed by the automatic blood pressure meter and the manual blood pressure meter.

A manual blood pressure monitor using a conventional blood pressure measurement method is a system in which a pressure is applied to the upper arm (brachial) using a cuff, a sphygmomanometer and a stethoscope while slowly depressurizing and listening to a Korotkoff sound using a stethoscope, The minimum blood pressure is measured.

Automatic blood pressure monitors use sensors rather than stethoscopes. In general, an automatic sphygmomanometer employs an oscillometric method of measuring systolic and diastolic blood pressures by an arterial pressure waveform. Current upper arm automatic sphygmomanometers use the magnitude of the pulse to determine the highest and lowest blood pressure values while monitoring the magnitude of the pulse during depressurization after pressurization. However, it is difficult to establish a sophisticated algorithm for signal analysis and noise removal in order to accurately measure the blood pressure by the oscillometric method, and it is difficult to measure the accurate blood pressure by the automatic blood pressure monitor using the oscillometric method.

Meanwhile, the current wrist type automatic blood pressure monitor uses an oscillometric method of determining the maximum and minimum blood pressure values by using the magnitude of the pulse while monitoring the magnitude of the pulse in the depressurization process after pressurization. This is because of technical limitations in listening to Korotkov's sound in the radial artery of the wrist.

Although the disadvantage (inaccuracy) of the wrist blood pressure monitor is that the wrist blood pressure value is higher than the upper arm blood pressure value, the measurement is performed on the wrist and the blood pressure value is expressed as the upper arm blood pressure value. Occurs.

Korean Registered Patent No. 1099235 (registered on December 20, 2011) Korea Registered Patent No. 1283798 (Registered on July 23, 2013)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wrist blood pressure monitor which can be worn on a wrist while using a Korotkoff sound. Another object of the present invention is to provide a wrist blood pressure monitor having improved reliability by applying a noise elimination algorithm and a correction algorithm for detecting fine Korotkoff sounds in the wrist radial artery.

To achieve the above object, according to the present invention, there is provided a wrist blood pressure tonometer comprising: a pressure bar including a wrist wrapping body and an air pocket; A piezo sensor for sensing a cochlear sound when the air bag is depressurized; And a controller for processing the signal sensed by the piezo sensor to measure the blood pressure.

The controller may determine the blood pressure measured at the start time and the end time of the Korotkoff sound as the systolic blood pressure and the systolic blood pressure, respectively.

A filter unit for removing noise from a signal sensed by the piezo sensor; And a corrector for calibrating a signal sensed by the piezo sensor.

The wrist blood pressure monitor according to the present invention can detect a corotor cochlear sound in the radial artery of the wrist and provide a blood pressure value, and a noise canceling algorithm and a correction algorithm for detecting a fine cochlear sound in the wrist radial artery It enables reliable blood pressure measurement.

1 is a schematic view of a wrist blood pressure monitor according to the present invention.
2 is a block diagram showing the configuration of a wrist blood pressure monitor according to the present invention.
3 is a flowchart illustrating an operation method of the wrist blood pressure monitor according to the present invention.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

FIG. 1 is a schematic view of a wrist blood pressure monitor according to the present invention, and FIG. 2 is a block diagram showing a configuration of a wrist blood pressure monitor according to the present invention.

1 and 2, the wrist blood pressure monitor 100 according to the present invention includes a pressing belt 110 including a body fixed to a cuff and an air bladder 120, And a piezo sensor 130 for detecting a coarse sound. The wrist blood pressure monitor 100 according to the present invention may further include a controller 140 for generally controlling the blood pressure measurement, a filter unit 150 for filtering or correcting the signals sensed by the piezo sensor 130, ). However, in another embodiment, the filter unit 150 and the correcting unit 160 may be omitted.

When the air bag 120 is depressurized and gradually depressurized, the piezoelectric sensor 130 senses a corotor cough sound generated in the blood vessel of the wrist. Air pipes, valves, and the like may be included for pressurizing and depressurizing the air bag 120, but the detailed description of such a configuration is omitted in order to avoid obscuring the essence of the present invention.

The signal of the Korotkoff sound sensed by the piezo sensor 130 is processed by a signal processor (not shown) and then transmitted to the controller 140. At this time, since the signal passed through the signal processing unit (not shown) may include noise, the filter unit 160 for noise filtering may be further included. Further, when the blood pressure value of the upper arm and wrist is normal, the blood pressure value measured on the wrist is higher than the blood pressure value measured on the upper arm. A correction unit 160 for correcting the blood pressure value may be further included, which calibrates the measured blood pressure value on the wrist and provides the upper arm blood pressure value.

The control unit 140 measures the systolic blood pressure at the start of the Korotkoff sound sensed by the piezo sensor 130 and measures the systolic blood pressure at the end point.

Although not shown in FIGS. 1 and 2, the control unit 140 may further include a display unit (not shown) for displaying measurement information including a systolic blood pressure and a diastolic blood pressure measured by the controller 140.

3 is a flowchart illustrating an operation method of the wrist blood pressure monitor according to the present invention. The operation of the wrist blood pressure monitor 100 according to the present invention will be described in detail with reference to the flowchart of FIG.

3, the wrist blood pressure monitor 100 according to the present invention includes a step S200 of pressing an air bag, a step S210 of depressurizing the air bag, a step S220 of measuring a corotor voice from the piezo sensor, A step S230 of determining the start time and the ending time of the corotor waveform, and a step S240 of measuring the maximum blood pressure and the minimum blood pressure.

First, the air bag 120 is pressurized to a predetermined pressure (S200).

Specifically, the air bladder 120 connected to a pump (not shown) via an air pipe (not shown) is pushed by the operation of the pump (not shown). A valve (not shown) is installed in an air pipe (not shown) to open and close an air pipe (not shown). Specifically, the air bag 120 is pressurized by opening a valve (not shown) and operating a pump (not shown). The pressure of the air bag 120 can be measured by a pressure sensor (not shown) provided separately, and the measured information is transmitted to the control unit 140.

Thereafter, a valve (not shown) and a pump (not shown) are operated to depressurize the air bag 120 (S210). Specifically, when the pressure of the air bladder 120 reaches the set pressure, the valve (not shown) is closed and the operation of the pump (not shown) is stopped.

Thereafter, the cock sensor 130 measures (detects) the corotor claw sound in the wrist (S220). Particularly, a signal for determining the start time and the end time of the cochlear voice is transmitted to the control unit 140, and the control unit 140 determines the start time and end time (S230) to measure the maximum blood pressure and the minimum blood pressure (S240).

On the other hand, the corot cop tone signal detected by the piezo sensor 130 may be subjected to a noise filtering step before being transmitted to the controller 140.

In addition, the corot cop tone signal sensed by the piezo sensor 130 may be further subjected to a correction step for calibration before being transmitted to the control unit 140. [

When the blood pressure of the upper arm and wrist is normal, the blood pressure measured on the wrist is higher than the blood pressure measured on the upper arm. The correction step is for correcting this, and the blood pressure value measured at the wrist may be calibrated to provide the upper arm blood pressure value.

In addition, the control unit 140 may further include a display step for confirming the maximum blood pressure and the minimum blood pressure measured by the control unit 140 to the user U. In the display step, various information related to the blood pressure including the maximum blood pressure and the minimum blood pressure are displayed, so that the user U can immediately grasp his / her blood pressure information.

According to the wrist blood pressure monitor 100 according to the present invention, a noise elimination algorithm for detecting a corotor cochlear sound in the wrist radial artery and providing a blood pressure value and detecting a fine cochlear sound in the wrist radial artery A calibration algorithm is applied to enable reliable blood pressure measurement.

The features, structures, effects and the like described in the embodiments are included in one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

100 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ Wrist blood pressure monitor 110
120 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥
140 Control unit 150 Filter unit
160?

Claims (3)

A pressurizing bag including a body surrounding the wrist and an air bag;
A piezo sensor for sensing a cochlear sound when the air bag is depressurized; And
And a controller for processing the signal detected by the piezo sensor to measure the blood pressure. The method according to claim 1,
Wherein the control unit determines the blood pressure measured at the start time and the end time of the Korotkoff sound as the systolic blood pressure and the diastolic blood pressure, respectively. The method according to claim 1,
A filter unit for removing noise from a signal sensed by the piezo sensor; And
And a correction unit for calibrating a signal sensed by the piezo sensor.

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