Blood pressure measurement device and method

Abstract

A blood pressure measurement device and method are disclosed. [Solution] The blood pressure measuring device of the present invention displays signals detected from the subject on a display in real time while the internal pressure of a cuff surrounding a part of the subject's body is varied, and includes a processor that, when a reference signal corresponding to the subject's blood pressure among the signals is displayed on the display in real time, visually displays the reference signal or displays a visual mark indicating the reference signal.

Description

[Technical Field]

[0001] The present invention relates to a blood pressure measurement device and method. [Background technology]

[0002] There are two methods for measuring blood pressure: invasive and non-invasive. While the invasive method is the most accurate, the non-invasive method is more commonly used due to pain and infection risks. Non-invasive methods are divided into the Korotkoff method and the oscillometric method, both of which use a cuff. The Korotkoff method uses a stethoscope to listen to the sound energy generated by turbulence that occurs during blood flow movement due to the opening and closing of blood vessels. The oscillometric method is primarily used in sphygmomanometers and is less accurate than the Korotkoff method. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention provides a blood pressure measurement device and method that combines the advantages of the Korotkoff method and the oscillometric method by utilizing the characteristics of the Korotkoff sounds and the oscillometric signals (e.g., the relationship between the Korotkoff sounds and the oscillometric signals).

[0004] However, the technical issues are not limited to those mentioned above, and further technical issues may exist. [Means for solving the problem]

[0005] A blood pressure measuring device according to one embodiment includes a processor that displays signals detected from a subject on a display in real time while an internal pressure of a cuff surrounding a part of the subject's body is varied, and that, when a reference signal corresponding to the subject's blood pressure among the signals is displayed on the display in real time, visually displays the reference signal or displays a visual mark indicating the reference signal.

[0006] The processor can display the signal on the display based on Korotkoff sounds contained in a sound signal collected by a microphone while the internal pressure of the cuff is varied.

[0007] If a signal that has not been detected from the subject is detected while the internal pressure of the cuff is varied, the processor may select the signal as a candidate reference signal, and may determine whether to determine the candidate reference signal as the reference signal based on whether a new signal is detected from the subject after the candidate reference signal.

[0008] The processor can determine the candidate reference signal as the reference signal in response to n (where n is a natural number) new signals being consecutively detected from the subject after the candidate reference signal.

[0009] The processor can display the signal on the display based on Korotkoff sounds detected within an interval based on a peak of the oscillometric signal detected from the subject.

[0010] The processor can determine whether the sound signal is a Korotkoff sound based on the ratio of frequency components of the sound signal collected from the subject that fall within a predetermined frequency band, and display the signal on the display based on the sound signal determined to be a Korotkoff sound.

[0011] The processor may determine as the Korotkoff sound a sound signal where the ratio is equal to or greater than a predetermined threshold ratio.

[0012] The processor can determine whether a sound signal collected from the subject is a Korotkoff sound depending on the amplitude of the sound signal, and display the signal on the display based on the sound signal determined to be a Korotkoff sound.

[0013] After the process of detecting the signal from the subject is completed, the processor may change the reference signal to the peripheral signal if the amplitude of the peripheral signal continuously detected in the reference signal in the section based on the oscillometric peak is smaller than a predetermined threshold amplitude, but the ratio of frequency components included in a predetermined frequency band among the frequency components of the peripheral signal is equal to or greater than a predetermined threshold ratio.

[0014] When the reference signal corresponds to the subject's diastolic blood pressure, the peripheral signal may be a signal detected at a cuff internal pressure lower than the reference signal, and when the reference signal corresponds to the subject's systolic blood pressure, the peripheral signal may be a signal detected at a cuff internal pressure higher than the reference signal.

[0015] The Korotkoff sounds contained in the sound signals collected from the subject can be output through a speaker.

[0016] A blood pressure measurement result in which the signal detected from the subject and an oscillometric signal are displayed in synchronization with each other is provided to the subject, and a visual mark indicating the reference signal corresponding to the subject's blood pressure can be displayed from the blood pressure measurement result, or the reference signal can be displayed visually differently.

[0017] The blood pressure measurement results can be output in the form of a printout.

[0018] The blood pressure measurement results can be transmitted to an electronic device having a display and displayed on the display of the electronic device.

[0019] A blood pressure measuring device according to one embodiment includes a processor that detects Korotkoff sounds contained in a sound signal collected from a subject based on an oscillometric signal detected from the subject while an internal pressure of a cuff surrounding a part of the subject's body is varied, and displays the detected Korotkoff sounds in real time on a display; and when a reference Korotkoff sound corresponding to the subject's blood pressure is displayed in real time on the display, the processor visually displays the reference Korotkoff sound or displays a visual mark indicating the reference Korotkoff sound.

[0020] The processor determines whether a candidate reference Korotkoff sound having a predetermined amplitude or greater is detected in a section of the sound signal based on the peak of the oscillometric signal, and if the candidate reference Korotkoff sound is detected, it can determine whether the candidate reference Korotkoff sound is a reference Korotkoff sound based on the ratio of frequency components of the candidate reference Korotkoff sound that are included in a predetermined frequency band.

[0021] A blood pressure measurement method according to one embodiment includes an operation of detecting a signal from a subject while an internal pressure of a cuff surrounding a part of the subject's body is varied, and an operation of displaying the signal on a display in real time, wherein the display operation includes, when a reference signal corresponding to the subject's blood pressure among the signals detected from the subject is displayed on the display in real time, visually displaying the reference signal or displaying a visual mark indicating the reference signal.

[0022] The displaying operation can display the signal on the display based on Korotkoff sounds contained in a sound signal collected by a microphone while the internal pressure of the cuff is varied.

[0023] The detecting operation may select a signal that has not been detected from the subject while the internal pressure of the cuff is being varied as a candidate reference signal, and determine whether to determine the candidate reference signal as the reference signal based on whether a new signal is detected from the subject after the candidate reference signal is detected.

[0024] The detecting operation may determine the candidate reference signal as the reference signal in response to the case where n (where n is a natural number) new signals are continuously detected from the subject after the candidate reference signal.

[0025] The detecting operation can detect the signal based on Korotkoff sounds detected within an interval based on a peak of an oscillometric signal detected from the subject.

[0026] The detecting operation can determine whether the sound signal is a Korotkoff sound based on a ratio of frequency components included in a predetermined frequency band among frequency components of the sound signal collected from the subject, and detect the signal based on the sound signal determined to be a Korotkoff sound.

[0027] The detecting operation may determine a sound signal in which the ratio is equal to or greater than a predetermined threshold ratio as the Korotkoff sound.

[0028] The detecting operation can determine whether the sound signal collected from the subject is a Korotkoff sound depending on the amplitude of the sound signal, and detect the signal based on the sound signal determined to be a Korotkoff sound.

[0029] A blood pressure measurement device according to one embodiment includes a cuff that detects both Korotkoff sounds and oscillometric signals from a subject, and a processor that measures the subject's blood pressure using the Korotkoff sounds and the oscillometric signals.

[0030] The processor can detect the Korotkoff sounds using the oscillometric signal and measure the subject's blood pressure based on the detected Korotkoff sounds.

[0031] The Korotkoff sounds collected from the subject can be output via a speaker.

[0032] A blood pressure measurement result in which the Korotkoff sounds and oscillometric signals detected from the subject are synchronized and displayed is provided to the subject, and a visual mark indicating a reference Korotkoff sound corresponding to the subject's blood pressure can be displayed from the blood pressure measurement result, or the reference Korotkoff sound can be visually displayed.

[0033] The blood pressure measurement results can be output in the form of a printout. [Effects of the Invention]

[0034] According to one embodiment, it is possible to provide a blood pressure measurement device and method that utilizes an oscillometric signal to improve the accuracy of blood pressure measurement based on Korotkoff sounds and is robust to noise and the skill level of the examiner.

[0035] According to one embodiment, a blood pressure measuring device and method can be provided that combines the advantages of the Korotkoff method based on Korotkoff sounds and the oscillometric method based on oscillometric signals.

[0036] According to one embodiment, when Korotkoff sounds detected while the cuff is being deflated are displayed on the display in real time, information about the systolic blood pressure and the diastolic blood pressure are also displayed on the display in real time, thereby efficiently improving the subject's 150 confidence in the measured blood pressure. The subject can visually check the Korotkoff sounds detected in real time, and also visually check the systolic blood pressure corresponding to the start time of the Korotkoff sounds and the diastolic blood pressure corresponding to the end time of the Korotkoff sounds, thereby improving the subject's confidence in the measurement results of the blood pressure measuring device.

[0037] According to one embodiment, Korotkoff sounds detected during the blood pressure measurement process are provided to the subject as visual and / or auditory feedback, thereby efficiently improving the subject's confidence in the blood pressure measurement results.

[0038] According to one embodiment, the blood pressure measurement results may be provided in print form.

[0039] According to one embodiment, the accuracy and reliability of blood pressure measurement results can be efficiently improved by simultaneously detecting the oscillometric signal and Korotkoff sounds in any one cuff. [Brief explanation of the drawings]

[0040] [Figure 1] FIG. 1 is a diagram for explaining a blood pressure measurement device according to an embodiment. [Figure 2] 10A and 10B are diagrams illustrating an operation of detecting Korotkoff sounds around peaks in an oscillometric signal according to one embodiment. [Figure 3] 10A and 10B are diagrams illustrating an operation of detecting Korotkoff sounds through frequency analysis of a sound signal according to an embodiment. [Figure 4] FIG. 10 is a diagram for explaining an operation of determining blood pressure information of a subject using n Korotkoff sounds according to one embodiment. [Figure 5] FIG. 10 is a diagram for explaining an operation of determining blood pressure information of a subject using n Korotkoff sounds according to one embodiment. [Figure 6] FIG. 10 is a diagram for explaining an operation of determining blood pressure information of a subject using n Korotkoff sounds according to one embodiment. [Figure 7] FIG. 10 is a diagram for explaining an operation of determining blood pressure information of a subject using n Korotkoff sounds according to one embodiment. [Figure 8] 10A and 10B are diagrams for explaining an operation of correcting blood pressure information of a subject after blood pressure measurement is completed according to one embodiment. [Figure 9] FIG. 1 illustrates a method for measuring blood pressure according to one embodiment. [Figure 10] FIG. 1 is a diagram showing a blood pressure measurement device according to an embodiment. [Figure 11] FIG. 10 is a diagram illustrating a result sheet according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0041] Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only and may be modified in various forms. Therefore, the embodiments are not limited to the specific disclosed forms, and the scope of the present specification includes modifications, equivalents, or alternatives within the technical spirit.

[0042] Although terms such as "first" or "second" may be used to describe multiple components, such terms should be construed only to distinguish one component from the other components. For example, a first component may be designated as a second component, and similarly, a second component may be designated as a first component.

[0043] When a component is referred to as being "coupled" or "connected" to another component, it should be understood that although it is directly coupled or connected to the other component, there may be other components in between.

[0044] The singular expression includes the plural expression unless the context clearly dictates otherwise. In this specification, the words "comprise" or "have" and the like indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0045] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention pertains. Commonly used predefined terms should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and should not be interpreted as having an ideal or overly formal meaning unless expressly defined herein.

[0046] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. When describing with reference to the drawings, the same reference numerals will be used to designate the same elements, regardless of the reference numerals, and redundant description thereof will be omitted.

[0047] FIG. 1 is a diagram illustrating a blood pressure measurement device according to one embodiment.

[0048] Methods for measuring blood pressure are classified into direct and indirect methods. Direct measurement involves inserting a catheter into an arterial canal to directly measure the pressure within the blood vessels. However, since this method requires intubation of the subject's artery, it may cause damage to the vascular system, making it difficult to use universally.

[0049] Research into indirect blood pressure measurement methods is currently underway. Among these, the Korotkoff method, which uses a stethoscope, a pressure gauge, and a cuff to measure blood pressure, is the most traditional and recognized standard. The Korotkoff method determines blood pressure based on the Korotkoff sounds generated when the cuff is inflated and then deflated. For example, the point at which Korotkoff sounds begin to appear when the cuff is deflated is determined as the systolic blood pressure (SBP), and the point at which Korotkoff sounds cease to occur is determined as the diastolic blood pressure (DBP). However, since the Korotkoff method requires the examiner (e.g., a doctor, nurse, or other medical staff member) to directly listen to the Korotkoff sounds generated when the cuff is inflated and then deflated to determine the blood pressure, the examiner's skill level significantly affects the accuracy of the measurement.

[0050] Another indirect measurement method, the oscillometric method, is relatively easy to measure and robust to noise, making it widely used in automatic blood pressure monitors. The oscillometric method applies pressure to an airbag inside the cuff, gradually reducing the pressure as arterial pressure generated by the heart's contraction is transmitted to the upper arm. The magnitude of the arterial pressure transmitted to the air pocket of the cuff wrapped around the upper arm is detected as corresponding to the internal pressure of the airbag inside the cuff. Based on the highest arterial pressure, the internal pressure of the airbag at the point where a certain level of arterial pressure is located is calculated as the systolic and diastolic blood pressure. Compared to the Korotkoff method, the oscillometric method is convenient because it does not require skilled techniques and is stable, being less susceptible to external noise and movement. However, due to the lack of clear standards for blood pressure measurement, each blood pressure monitor uses a different blood pressure measurement algorithm, which can lead to errors and reduced accuracy.

[0051] To combine the accuracy of the Korotkoff method with the convenience of an automatic blood pressure monitor based on the oscillometric method, a microphone may be attached to the cuff of the automatic blood pressure monitor, and the Korotkoff sound detected by the microphone may be collected along with an oscillometric signal detected by a pressure sensor that measures changes in pressure within the cuff. Using the oscillometric signal, the start and end points of the Korotkoff sound, an audible signal in the form of an impulse generated when blood pressure exceeds the internal pressure of the cuff, may be identified, and blood pressure information of the subject may be determined based on the start and end points. The present disclosure relates to a blood pressure measurement device and method that utilizes the oscillometric signal to improve the accuracy of Korotkoff sound-based blood pressure measurement and is robust against noise and the skill of the examiner.

[0052] Referring to FIG. 1, a blood pressure measurement device 100 includes a processor (not shown), a display 110 and an input unit 120.

[0053] The processor controls the overall operation of the blood pressure measuring device 100 and controls the other components included in the blood pressure measuring device 100 .

[0054] The display 110 can display the blood pressure measurement process and results. For example, the display 110 can display a signal detected from the subject 150 in real time while the internal pressure of the cuff 130 surrounding a part of the body of the subject 150 is varied. The display 110 can display blood pressure information of the subject 150 once the blood pressure measurement is completed. In addition, the display 110 can display various information related to the blood pressure measurement without any limitation.

[0055] The input unit 120 receives inputs related to blood pressure measurement from the subject 150 and / or the examiner. For example, the input unit 120 may receive, but is not limited to, inputs for starting operation of the blood pressure measurement device 100, emergency stop, measured blood pressure information, or pre-stored blood pressure information output. In FIG. 1, for convenience of explanation, the input unit 120 is illustrated as a physical button. However, the input unit 120 is not limited to the above example and may be implemented in various forms (e.g., touch, jog dial, switch, etc.). In another embodiment, the input unit 120 is omitted, and inputs are received from the subject 150 and / or the examiner via the display 110 embodied as a touch screen.

[0056] The cuff 130 includes an airbag whose internal pressure is adjusted by injecting or expelling fluid, and the airbag can surround a part of the body of the subject 150 during blood pressure measurement. For example, the part of the body of the subject 150 may be the upper arm, but is not limited to the above example. In this specification, the internal pressure of the airbag in the cuff 130 may be referred to as the internal pressure of the cuff 130 for convenience of explanation.

[0057] The connecting wire 140 includes an electric wire and a fluid tube connecting the blood pressure measurement device 100 and the cuff 130. The electric wire can electrically connect the blood pressure measurement device 100 to a sensor (e.g., a microphone, a pressure sensor, etc.) in the cuff 130. Depending on the embodiment, all or part of the sensor may be disposed in the blood pressure measurement device 100, and a signal (such as an oscillometric signal and / or a Korotkoff sound) acquired by the cuff 130 may be transmitted to the sensor in the blood pressure measurement device 100 via the connecting wire 140. The fluid tube can transmit a fluid to be injected into an airbag in the cuff 130 or a fluid to be discharged from the airbag.

[0058] The blood pressure measurement device 100 can collect a sound signal generated when the cuff 130 is inflated above a normal systolic blood pressure and then gradually deflated while the cuff 130 is wrapped around the upper arm of the subject 150 using a microphone and detect an oscillometric signal using a pressure sensor. The blood pressure measurement device 100 analyzes the sound signal and the oscillometric signal to detect Korotkoff sounds from the sound signal and can determine the systolic blood pressure and diastolic blood pressure of the subject 150 in real time based on the detected Korotkoff sounds. The blood pressure measurement device 100 also displays the detected Korotkoff sounds on the display 110 in real time. When the reference Korotkoff sounds corresponding to the systolic blood pressure and the reference Korotkoff sounds corresponding to the diastolic blood pressure are displayed on the display 110 in real time, the corresponding reference Korotkoff sounds may be visually displayed differently (e.g., with different colors, different line widths, different line shapes, etc.) or a visual mark (e.g., an arrow, a triangle, etc.) indicating the corresponding reference Korotkoff sounds may be displayed.

[0059] When the subject 150 measures blood pressure after wrapping the cuff 130 around the upper arm without any additional equipment, the blood pressure measurement device 100 can detect both the oscillometric signal and the Korotkoff sounds from the subject 150 through the cuff 130. A sound receiving unit (e.g., a microphone) for detecting the Korotkoff sounds can be coupled to the cuff 130 so as to be in close contact with the body of the subject 150 wearing the cuff 130. A pressure sensor for detecting the oscillometric signal can also be disposed in the cuff 130, or a device and / or component for transmitting a signal to a pressure sensor disposed in the blood pressure measurement device 100 can be disposed in the cuff 130.

[0060] When Korotkoff sounds detected while the cuff 130 is being depressurized are displayed in real time on the display 110, information about the systolic blood pressure and the diastolic blood pressure are also displayed in real time on the display 110, thereby efficiently improving the reliability of the subject 150 in the measured blood pressure. The subject 150 can visually confirm the Korotkoff sounds detected in real time, and can also visually confirm the systolic blood pressure corresponding to the start time of the Korotkoff sounds and the diastolic blood pressure corresponding to the end time of the Korotkoff sounds, thereby improving the reliability of the subject 150 in the measurement results of the blood pressure measurement device 100.

[0061] In addition, Korotkoff sounds detected while the cuff 130 is being deflated may be output via a speaker (not shown). The subject 150 can improve his or her confidence in the blood pressure measurement results by receiving real-time auditory feedback of the detected Korotkoff sounds. As described above, the subject 150 can also receive real-time visual feedback of the detected Korotkoff sounds via the display 110, thereby directly verifying the blood pressure measurement results through both hearing and vision, thereby efficiently improving his or her satisfaction with the blood pressure measurement results. The speaker that outputs the Korotkoff sounds may be built into the blood pressure measurement device 100, but is not limited to the above example. It may also be a separate device that receives the detected Korotkoff sounds from the blood pressure measurement device 100 via a wired and / or wireless network. For convenience of explanation, the following description will be given taking the case where the detected Korotkoff sounds are displayed on the display 110 as an example, but this description can also be applied to the case where the Korotkoff sounds are output via a speaker.

[0062] According to one embodiment, the blood pressure measurement device 100 can combine the advantages of the Korotkoff method and the oscillometric method by using characteristics of the Korotkoff sounds and the oscillometric signal (e.g., the relationship between the Korotkoff sounds and the oscillometric signal). The blood pressure measurement device 100 may detect the oscillometric signal. The blood pressure measurement device 100 determines whether a Korotkoff sound is detected in a section based on the peak of the oscillometric signal and whether the amplitude of the Korotkoff sound is equal to or greater than a predetermined threshold amplitude. If a Korotkoff sound with an amplitude equal to or greater than a predetermined threshold amplitude is detected in a section based on the peak of the oscillometric signal, the blood pressure measurement device 100 can determine whether the Korotkoff sound is noise through frequency analysis of the Korotkoff sound. If the Korotkoff sound is determined not to be noise, the blood pressure measurement device 100 can display the Korotkoff sound on the display 110 in real time.

[0063] FIG. 2 is a diagram illustrating an operation of detecting Korotkoff sounds around the peaks of an oscillometric signal according to one embodiment.

[0064] Referring to FIG. 2, an example is shown to illustrate the operation of detecting Korotkoff sounds from a sound signal using the correlation between Korotkoff sounds and an oscillometric signal.

[0065] Blood pressure changes due to heartbeats are indicated by a pulse pattern, which can also be reflected in the oscillometric signal. Furthermore, Korotkoff sounds occur when blood pressure exceeds the internal pressure of the cuff, and are therefore indicated corresponding to the peaks of the oscillometric signal. By utilizing this characteristic, Korotkoff sounds can be detected with high accuracy near the peaks of the oscillometric signal. Generally, the peaks of the oscillometric signal are more resistant to noise and easier to detect than Korotkoff sounds. Therefore, by first detecting the peaks of the oscillometric signal and then detecting Korotkoff sounds near the corresponding peaks, the accuracy of Korotkoff sound detection can be improved.

[0066] The blood pressure measuring device can detect Korotkoff sounds within an interval based on the peak of the oscillometric signal detected from the subject.

[0067] A screen 210 displayed on the display of the blood pressure measurement device may include a sound signal collected by the microphone and an oscillometric signal detected by the pressure sensor (denoted by OSC in FIG. 2).

[0068] Case 1 220 illustrates an example in which the internal pressure of the cuff is higher than the blood pressure, and Korotkoff sounds are not generated. The blood pressure measuring device can check whether Korotkoff sounds are present in the sound signal within section 221, which is based on the peak of the oscillometric signal. Section 221 is set to have a predetermined amplitude based on the peak of the oscillometric signal, but is not limited to the above example. For example, section 221 may be set to have a dynamic amplitude depending on the amplitude of the peak. Because the sound signal remains relatively constant within section 221, the blood pressure measuring device determines that Korotkoff sounds are not present within section 221.

[0069] In the second case 230, Korotkoff sounds are generated because the blood pressure is higher than the internal pressure of the cuff. The blood pressure measuring device can check whether Korotkoff sounds are included in the sound signal within a section 231 based on the peak of the oscillometric signal. The blood pressure measuring device can detect impulse-shaped waves included in the sound signal within the corresponding section 221 as Korotkoff sounds.

[0070] The blood pressure measurement device detects Korotkoff sounds in a partial section of the sound signal rather than the entire sound signal based on the peaks of the oscillometric signal, thereby minimizing the resources required for detecting Korotkoff sounds and improving the accuracy of detecting Korotkoff sounds.

[0071] The blood pressure measurement device may also determine whether a sound signal collected from a subject is a Korotkoff sound based on the amplitude of the sound signal. Because Korotkoff sounds are actually audible signals that are audible to the human ear, Korotkoff sounds have an amplitude greater than or equal to a certain threshold. Therefore, the blood pressure measurement device can determine whether a sound signal is a Korotkoff sound based on the amplitude of the sound signal. For example, the amplitude of the sound signal may be determined as the maximum difference between a baseline and the corresponding signal, or the maximum and minimum difference of the corresponding signal. The blood pressure measurement device can determine whether a sound signal is a Korotkoff sound based on whether the amplitude of the sound signal determined in this manner is greater than or equal to a predetermined threshold amplitude.

[0072] Furthermore, the blood pressure measuring device can determine whether a sound signal is a Korotkoff sound based on whether the sound signal is audible. For example, sounds that humans can hear are expressed in dBSPL values ​​(or decibels), and sounds starting from 0 decibels are audible to humans, but the average person can hear sounds starting from about 20 decibels. Even for sounds of the same volume, humans cannot hear low-frequency sounds well, and higher frequencies are heard more clearly. This relationship between human hearing levels and frequency may be utilized to determine whether an audible signal is present.

[0073] FIG. 3 is a diagram illustrating an operation of detecting Korotkoff sounds through frequency analysis of a sound signal according to an embodiment.

[0074] Referring to FIG. 3, an example is shown to explain the operation of determining whether a sound signal contains Korotkoff sounds and noise through frequency analysis.

[0075] Because Korotkoff sounds are audible signals, they generally have characteristics that exist in a specific frequency band (e.g., 50-200 Hz). The blood pressure measurement device uses the frequency band characteristics of Korotkoff sounds to determine whether a given sound signal is a Korotkoff sound or contains noise. The frequency analysis is performed on the sound signal within the range in which Korotkoff sounds can occur. For example, the frequency analysis may be performed on the sound signal primarily detected as a Korotkoff sound, as shown in FIG. 2.

[0076] The blood pressure measurement device can determine whether a sound signal collected from a subject is a Korotkoff sound based on the ratio of frequency components in a predetermined frequency band (e.g., 50-200 Hz) among the frequency components of the sound signal.

[0077] For example, in a first case 310 where the ratio between the frequency components included in the predetermined frequency band and the frequency components included in the remaining frequency band is equal to or greater than a first predetermined threshold ratio, the blood pressure measurement device may determine the corresponding sound signal as a Korotkoff sound.

[0078] Alternatively, in a second case 320 in which the ratio between the frequency components included in the predetermined frequency band and the frequency components included in the remaining frequency band is less than a predetermined first threshold ratio and greater than or equal to a predetermined second threshold ratio, the blood pressure measurement device may determine the corresponding sound signal as a Korotkoff sound containing noise. Here, the second threshold ratio may be set lower than the first threshold ratio. Because the corresponding Korotkoff sound contains noise, the blood pressure measurement device uses the corresponding Korotkoff sound for blood pressure value estimation but does not use it for Korotkoff silence correction.

[0079] Alternatively, in a third case 330 where the ratio between the frequency components included in the predetermined frequency band and the frequency components included in the remaining frequency band is less than a predetermined second threshold ratio, the blood pressure measurement device may determine the corresponding sound signal as noise.

[0080] 4 to 7 are diagrams for explaining the operation of determining blood pressure information of a subject using n Korotkoff sounds according to one embodiment.

[0081] Referring to FIG. 4, Korotkoff sounds occur when blood pressure is higher than the internal pressure of the cuff. Korotkoff sounds have the characteristic of occurring continuously in accordance with the cardiac cycle from SBP point 410 to DBP point 420. The blood pressure measuring device can correct erroneously detected Korotkoff sounds in real time using these characteristics of Korotkoff sounds.

[0082] Even when the internal pressure of the cuff is greater than the blood pressure, a temporary impulse-shaped sound signal may be collected. In some cases, if such an impulse-shaped sound signal satisfies the criteria described with reference to Figures 2 and 3, the blood pressure measuring device may erroneously recognize the corresponding sound signal as a Korotkoff sound. However, as described above, normal Korotkoff sounds have the characteristic of occurring continuously in accordance with the cardiac cycle from the SBP point 410 to the DBP point 420. However, following such a temporary impulse-shaped sound signal, no subsequent Korotkoff sounds are detected.

[0083] If a Korotkoff sound that has not been detected from the subject while the internal pressure of the cuff is being varied is detected, the blood pressure measuring device selects the corresponding signal as a candidate reference Korotkoff sound, and determines whether to determine the candidate reference Korotkoff sound as a reference Korotkoff sound corresponding to systolic blood pressure based on whether a new Korotkoff sound is detected from the subject after the candidate reference Korotkoff sound.The blood pressure measuring device can determine the candidate reference Korotkoff sound as a reference Korotkoff sound in response to n (where n is a natural number) new Korotkoff sounds being consecutively detected from the subject after the candidate reference Korotkoff sound.

[0084] 5 shows an example in which a Korotkoff sound is temporarily detected and selected as a candidate reference Korotkoff sound 511, but no new Korotkoff sounds are detected after the candidate reference Korotkoff sound 511. A screen displayed on a display shows a Korotkoff sound 510 and an oscillometric signal 520. The oscillometric signal 520 displays the value detected from the pressure sensor, while the Korotkoff sound 510 displays only the value detected as a Korotkoff sound from the sound signal collected by the microphone. While the oscillometric signal 520 continues to be detected while the internal pressure of the cuff varies over time, if no subsequent Korotkoff sounds are detected after the first detection of the candidate reference Korotkoff sound 511, the candidate reference Korotkoff sound 511 is not ultimately selected as a reference Korotkoff sound.

[0085] 6 shows an example in which a Korotkoff sound is temporarily detected and selected as a candidate reference Korotkoff sound 610, and new Korotkoff sounds are detected after the candidate reference Korotkoff sound 610. Since n new Korotkoff sounds are successively detected after the candidate reference Korotkoff sound 610, the blood pressure measuring device may determine the candidate reference Korotkoff sound 610 as the reference Korotkoff sound corresponding to systolic blood pressure and may display the reference Korotkoff sound visually different from other Korotkoff sounds or may display a visual mark (e.g., a triangle) indicating the reference Korotkoff sound. For convenience of explanation, FIG. 6 illustrates a case where n=4, but n may also be a natural number.

[0086] 7 shows an example in which visual marks (e.g., triangles) indicating reference Korotkoff sounds 710 corresponding to systolic blood pressure and reference Korotkoff sounds 720 corresponding to diastolic blood pressure are displayed in the manner described above. For convenience of explanation, visual marks indicating reference Korotkoff sounds 710 and 720 are displayed in FIG. 7, but the embodiment is not limited thereto, and reference Korotkoff sounds 710 and 720 may be displayed differently from other Korotkoff sounds.

[0087] When Korotkoff sounds are continuously detected and no more are detected, the blood pressure measurement device can determine the last detected Korotkoff sound as the reference Korotkoff sound 720 corresponding to the diastolic blood pressure. Once the blood pressure measurement is completed, not only the detected Korotkoff sounds and oscillometric signals but also various blood pressure-related information (e.g., systolic / diastolic blood pressure, pulse rate, etc.) can be displayed on the display screen.

[0088] The Korotkoff sounds displayed with reference to FIGS. 5 to 7 are detected by the Korotkoff sound detection method described above.

[0089] FIG. 8 is a diagram for explaining an operation of correcting blood pressure information of a subject after blood pressure measurement is completed according to one embodiment.

[0090] Referring to FIG. 8, an example is shown in which baseline Korotkoff sounds 810, corresponding to diastolic blood pressure after a blood pressure measurement is completed, are corrected to ambient Korotkoff sounds 820.

[0091] The blood pressure measuring device can analyze the characteristics of the measured sound signal and variably adjust the criteria used to detect Korotkoff sounds. Even if the amplitude of the sound signal collected by the microphone after the reference Korotkoff sound corresponding to diastolic blood pressure is small, if a Korotkoff sound is detected around the peak of the oscillometric signal and the ratio of frequency components of the Korotkoff sound that are included in a predetermined frequency band is equal to or greater than a predetermined threshold ratio, the blood pressure measuring device can change the reference Korotkoff sound 810 to a peripheral Korotkoff sound 820. For example, the blood pressure measuring device may change the reference Korotkoff sound 810 to a peripheral Korotkoff sound 820 a predetermined number of times.

[0092] Even after the blood pressure measurement is completed, by correcting the reference Korotkoff sounds 810 to the surrounding Korotkoff sounds 820, the reference Korotkoff sounds can be detected more accurately even if the subject's Korotkoff sounds themselves are small.

[0093] For ease of explanation, FIG. 8 shows an example of correcting a baseline Kortkoff sound 810 corresponding to diastolic blood pressure to a subsequently measured peripheral Kortkoff sound 820, but the above description may equally apply to an example of correcting a baseline Kortkoff sound corresponding to systolic blood pressure to a previously measured peripheral Kortkoff sound.

[0094] FIG. 9 is a diagram illustrating a blood pressure measurement method according to one embodiment.

[0095] In the following embodiments, the operations may be performed in order, but they do not necessarily have to be performed in order. For example, the order of the operations may be changed, or at least two operations may be performed in parallel. Operations 1001 to 1010 may be performed by at least one component (e.g., processor, sensor, etc.) of an electronic device. In the embodiment, the operations may be performed in order, but they do not necessarily have to be performed in order. For example, the order of the operations may be changed, or at least two operations may be performed in parallel. Operations 910 to 620 may be performed by at least one component (e.g., a processor) of the blood pressure measurement device.

[0096] In operation 910, the blood pressure measurement device detects a signal from the subject while varying the pressure inside a cuff surrounding a portion of the subject's body.

[0097] If a signal that has not been detected from the subject while the internal pressure of the cuff is varied is detected, the blood pressure measuring device selects the signal as a candidate reference signal, and determines whether to determine the candidate reference signal as a reference signal based on whether a new signal is detected from the subject after the candidate reference signal is detected. The blood pressure measuring device determines the candidate reference signal as a reference signal in response to n (where n is a natural number) new signals being consecutively detected from the subject after the candidate reference signal is detected.

[0098] The blood pressure measuring device can detect a signal based on Korotkoff sounds detected within an interval based on the peak of the oscillometric signal detected from the subject.

[0099] The blood pressure measurement device determines whether a sound signal is a Korotkoff sound based on a ratio of frequency components included in a predetermined frequency band among frequency components of the sound signal collected from the subject, and can detect a signal based on the sound signal determined to be a Korotkoff sound.The blood pressure measurement device can determine, as a Korotkoff sound, a sound signal whose ratio is equal to or greater than a predetermined threshold ratio.

[0100] The blood pressure measurement device can determine whether a sound signal collected from the subject is a Korotkoff sound depending on the amplitude of the sound signal, and detect the signal based on the sound signal determined to be a Korotkoff sound.

[0101] In operation 920, the blood pressure measurement device displays the signal on a display in real time. When a reference signal corresponding to the subject's blood pressure among signals detected from the subject is displayed on the display in real time, the blood pressure measurement device can visually display the reference signal or display a visual mark indicating the reference signal. The blood pressure measurement device can display a signal on a display based on Korotkoff sounds included in a sound signal collected by a microphone while the internal pressure of the cuff is varied.

[0102] The operations shown in FIG. 9 are the same as those described above with reference to FIGS. 1 to 8, and therefore will not be described in detail.

[0103] FIG. 10 is a diagram showing a blood pressure measurement device according to one embodiment.

[0104] 10, the blood pressure measurement device 1000 includes a processor 1010. The blood pressure measurement device 1000 further includes a display 1020 and a memory 1030. The processor 1010, the display 1020, and the memory 1030 can communicate with each other via a bus, a PCIe (Peripheral Component Interconnect Express) and / or an NoC (Network on a Chip), etc.

[0105] The processor 1010 displays on the display in real time the signals detected from the subject while the internal pressure of the cuff surrounding a part of the subject's body is varied, and when a reference signal corresponding to the subject's blood pressure among the signals is displayed on the display in real time, the processor 1010 may visually display the reference signal or display a visual mark indicating the reference signal.

[0106] The processor 1010 may display a signal on a display based on the Korotkoff sounds contained in the sound signal collected by the microphone while the internal pressure of the cuff is varied.

[0107] If a signal that has not been detected from the subject while the internal pressure of the cuff is varied is detected, the processor 1010 may select the signal as a candidate reference signal and determine whether to determine the candidate reference signal as a reference signal based on whether a new signal is detected from the subject after the candidate reference signal is detected. The processor 1010 may determine the candidate reference signal as a reference signal in response to n (where n is a natural number) new signals being consecutively detected from the subject after the candidate reference signal is detected.

[0108] The processor 1010 may display a signal on a display based on Korotkoff sounds detected within an interval referenced to a peak in the oscillometric signal detected from the subject.

[0109] The processor 1010 determines whether the sound signal is a Korotkoff sound based on the ratio of frequency components included in a predetermined frequency band among frequency components of the sound signal collected from the subject, and displays a signal on a display based on the sound signal determined to be a Korotkoff sound. The processor 1010 may determine, as a Korotkoff sound, a sound signal whose ratio is equal to or greater than a predetermined threshold ratio.

[0110] The processor 1010 may determine whether the sound signal collected from the subject is a Korotkoff sound depending on the amplitude of the sound signal, and may display a signal on a display based on the sound signal determined to be a Korotkoff sound.

[0111] After completing the process of detecting a signal from the subject, the processor 1010 may change the reference signal to the peripheral signal if the amplitude of the peripheral signal detected consecutively with the reference signal in a section based on the peak of the oscillometric signal is smaller than a predetermined threshold amplitude but the ratio of frequency components included in a predetermined frequency band among frequency components of the peripheral signal is equal to or greater than a predetermined threshold ratio. If the reference signal corresponds to the diastolic blood pressure of the subject, the peripheral signal may be a signal detected at an internal cuff pressure lower than that of the reference signal, and if the reference signal corresponds to the systolic blood pressure of the subject, the peripheral signal may be a signal detected at an internal cuff pressure higher than that of the reference signal.

[0112] In addition, processor 1010 detects Korotkoff sounds contained in a sound signal collected from the subject based on an oscillometric signal detected from the subject while the internal pressure of a cuff surrounding a part of the subject's body is varied, and displays the detected Korotkoff sounds in real time on a display. When a reference Korotkoff sound corresponding to the subject's blood pressure among the Korotkoff sounds is displayed in real time on the display, processor 1010 visually displays the reference Korotkoff sound or displays a visual mark indicating the reference Korotkoff sound. Processor 1010 determines whether a candidate Korotkoff sound having an amplitude equal to or greater than a predetermined amplitude is detected in a section based on a peak of the oscillometric signal within the sound signal output, and if a candidate Korotkoff sound is detected, processor 1010 may determine whether the candidate Korotkoff sound is a Korotkoff sound based on the ratio of frequency components included in a predetermined frequency band among frequency components of the candidate Korotkoff sound.

[0113] The display 1020 can display in real time the signals detected from the subject while the internal pressure of the cuff surrounding a part of the subject's body is varied under the control of the processor 1010. When a reference signal corresponding to the subject's blood pressure among the signals is displayed on the display in real time, the display 1020 may visually display the reference signal or display a visual mark indicating the reference signal.

[0114] The memory 1030 may include computer-readable instructions, and the processor 1010 may perform the operations described above by executing the instructions stored in the memory 1030. The memory 1030 may be a volatile memory or a non-volatile memory.

[0115] Additionally, the blood pressure measuring device 1000 can process the operations described above.

[0116] FIG. 11 is a diagram for explaining a result sheet according to one embodiment.

[0117] FIG. 11 shows an example of a result sheet provided upon completion of blood pressure measurement of a subject. The result sheet may be provided to the subject and / or medical staff in the form of a printed matter. For example, the printed matter may have the size of an A4 sheet of paper or a letter paper, but is not limited to the above-mentioned example. For convenience of explanation, FIG. 11 shows an example in which blood pressure measurement results are provided in the form of a result sheet. However, the form in which the blood pressure measurement results are provided is not limited to the above-mentioned example, and the blood pressure measurement results may be displayed on a display provided in the blood pressure measuring device or a separate device that receives the blood pressure measurement results from the blood pressure measuring device.

[0118] The first item 1110 on the results sheet displays the most recent blood pressure measurement taken. The Korotkoff sounds and oscillometric signal may be displayed synchronized with each other, along with visual markings indicating the subject's systolic and diastolic blood pressure.

[0119] Specific blood pressure measurement results set by the subject and / or medical staff are displayed in the second item 1120 on the result sheet. For example, if a blood pressure measurement result at an important time or turning point is set as a "favorite," it will be displayed in the second item 1120 on the result sheet and can be easily compared with the most recent blood pressure measurement result in the first item.

[0120] The third item 1130 on the results sheet may display a history of previous blood pressure measurements. Depending on the embodiment, the previous history may be provided in tabular and graphical form.

[0121] The fourth item 1140 on the results sheet may display various information useful to the test subject.

[0122] The result sheet includes a total of four items 1110 to 1140, but is not limited to the above example and can be provided in various forms.

[0123] The above-described embodiments may be implemented using hardware components, software components, and / or a combination of hardware and software components. For example, the adaptive supersampling apparatus, methods, and components described in the embodiments may be implemented using a general-purpose computer or a special-purpose computer, such as a processor, controller, arithmetic logic unit (ALU), digital signal processor, microcomputer, field programmable gate array (FPGA), programmable logic unit (PLU), microprocessor, or other device capable of executing and responding to commands. The processing device may execute an operating system (OS) and software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to the execution of software. For ease of understanding, the description may refer to a single processing device, but those skilled in the art will recognize that the processing device may include multiple processing elements and / or multiple types of processing elements. For example, the processing adaptive supersampling apparatus may include multiple processors or one processor and one controller. Other processing configurations are also possible, such as parallel processors.

[0124] The software may include a computer program, code, instructions, or any combination thereof, capable of configuring a processing device or instructing the processing device, either individually or collectively, as desired. The software and / or data may be permanently embodied in any type of machine, component, physical adaptive supersampling device, virtual adaptive supersampling device, computer storage medium, or adaptive supersampling device, or transmitted signal wave, to be interpreted by or provide instructions or data to the processing adaptive supersampling device. The software may be distributed across networked computer systems and stored or executed in a distributed manner. The software and data may be stored on a computer-readable recording medium.

[0125] The method according to the present invention may be embodied in the form of program instructions that can be executed by various computer means and recorded on a computer-readable recording medium. The recording medium may include program instructions, data files, data structures, and the like, alone or in combination. The recording medium and program instructions may be specially designed and constructed for the purposes of the present invention, or they may be well known and available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, and hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language code, such as that generated by a compiler, but also high-level language code that is executed by a computer using an interpreter, for example.

[0126] The hardware devices described above may be configured to operate as one or more software models to perform the operations described in the present invention, and vice versa.

[0127] Although the embodiments have been described above with reference to limited drawings, those skilled in the art may apply various technical modifications and variations based on the above description. For example, the described techniques may be performed in a different order than described, and / or the components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different manner than described, and may be replaced or substituted with other components or equivalents, while still achieving suitable results.

[0128] Accordingly, other implementations, other embodiments, and equivalents of the claims are intended to fall within the scope of the following claims. [Explanation of symbols]

[0129] 100: Blood pressure measuring device 110: Display 120: Input section 130: Cuff 140: Connecting line 150: Subject

Claims

1. A blood pressure measuring device comprising: a processor that displays signals detected from a subject on a display in real time while an internal pressure of a cuff surrounding a part of the subject's body is varied; and when a reference signal corresponding to the subject's blood pressure among the signals is displayed on the display in real time, the processor visually displays the reference signal or displays a visual mark indicating the reference signal.

2. The blood pressure measuring device according to claim 1 , wherein the processor displays the signal on the display based on Korotkoff sounds contained in a sound signal collected by a microphone while the internal pressure of the cuff is varied.

3. The processor: If a signal not detected from the subject is detected while the internal pressure of the cuff is being varied, the signal is selected as a candidate reference signal; 2. The blood pressure measurement device according to claim 1, wherein whether or not to determine the candidate reference signal as the reference signal is determined based on whether or not a new signal is detected from the subject after the candidate reference signal.

4. 4. The blood pressure measurement device of claim 3, wherein the processor determines the candidate reference signal as the reference signal in response to n (where n is a natural number) new signals being consecutively detected from the subject after the candidate reference signal.

5. The blood pressure measurement device according to claim 1 , wherein the processor displays the signal on the display based on Korotkoff sounds detected within an interval based on a peak of the oscillometric signal detected from the subject.

6. The processor: determining whether the sound signal is a Korotkoff sound based on a ratio of frequency components included in a predetermined frequency band among frequency components of the sound signal collected from the subject; The blood pressure measurement device according to claim 1 , wherein the signal is displayed on the display based on the sound signal determined as the Korotkoff sound.

7. The blood pressure measurement device according to claim 6 , wherein the processor determines a sound signal whose ratio is equal to or greater than a predetermined threshold ratio as the Korotkoff sound.

8. The processor: determining whether the sound signal is a Korotkoff sound according to the amplitude of the sound signal collected from the subject; The blood pressure measurement device according to claim 1 , wherein the signal is displayed on the display based on the sound signal determined as the Korotkoff sound.

9. The processor:

2. The blood pressure measurement device of claim 1, wherein after the process of detecting the signal from the subject is completed, even if the amplitude of a peripheral signal continuously detected in the reference signal in a section based on an oscillometric peak is smaller than a predetermined threshold amplitude, the reference signal is changed to the peripheral signal if a ratio of frequency components included in a predetermined frequency band among frequency components of the peripheral signal is equal to or greater than a predetermined threshold ratio.

10. When the reference signal corresponds to the diastolic blood pressure of the subject, the peripheral signal is a signal detected at an internal pressure of the cuff lower than that of the reference signal; 10. The blood pressure measurement device according to claim 9, wherein when the reference signal corresponds to the systolic blood pressure of the subject, the peripheral signal is a signal detected at an internal pressure of the cuff higher than that of the reference signal.

11. The blood pressure measuring device according to claim 1 , wherein the Korotkoff sounds contained in the sound signal collected from the subject are output via a speaker.

12. a blood pressure measurement result is provided to the subject, in which the signal detected from the subject and an oscillometric signal are displayed in synchronization with each other; 2. The blood pressure measurement device according to claim 1, wherein a visual mark indicating the reference signal corresponding to the subject's blood pressure is displayed from the blood pressure measurement result, or the reference signal is visually displayed differently.

13. The blood pressure measurement device according to claim 12 , wherein the blood pressure measurement result is output in the form of a printed matter.

14. The blood pressure measuring device according to claim 12, wherein the blood pressure measurement result is transmitted to an electronic device having a display and displayed on a display of the electronic device.

15. 1. A blood pressure measuring device comprising: a processor that detects Korotkoff sounds contained in a sound signal collected from a subject based on an oscillometric signal detected from the subject while an internal pressure of a cuff surrounding a part of the subject's body is varied, and displays the detected Korotkoff sounds in real time on a display; and when a reference Korotkoff sound corresponding to the subject's blood pressure is displayed in real time on the display among the Korotkoff sounds, the processor visually displays the reference Korotkoff sound or displays a visual mark indicating the reference Korotkoff sound.

16. The processor: determining whether a candidate reference Korotkoff sound having a predetermined amplitude or more is detected in a section of the sound signal based on the peak of the oscillometric signal; 16. The blood pressure measurement device according to claim 15, wherein, if the candidate reference Korotkoff sound is detected, it is determined whether the candidate reference Korotkoff sound is a reference Korotkoff sound based on a ratio of frequency components of the candidate reference Korotkoff sound that are included in a predetermined frequency band.

17. detecting a signal from a subject while varying the internal pressure of a cuff surrounding a body part of the subject; an operation of displaying the signal on a display in real time; Including, In the blood pressure measurement method, the display operation includes visually displaying a reference signal corresponding to the subject's blood pressure among the signals detected from the subject on the display in real time, or displaying a visual mark indicating the reference signal.

18. 18. The blood pressure measurement method according to claim 17, wherein the displaying operation displays the signal on the display based on Korotkoff sounds contained in a sound signal collected by a microphone while the internal pressure of the cuff is varied.

19. The detecting operation includes: If a signal not detected from the subject is detected while the internal pressure of the cuff is being varied, the signal is selected as a candidate reference signal; 18. The blood pressure measurement method according to claim 17, further comprising determining whether or not to determine the candidate reference signal as the reference signal based on whether or not a new signal is detected from the subject after the candidate reference signal.

20. 20. The blood pressure measurement method of claim 19, wherein the detecting operation determines the candidate reference signal as the reference signal in response to n (where n is a natural number) new signals being consecutively detected from the subject after the candidate reference signal.

21. 18. The blood pressure measurement method according to claim 17, wherein the detecting operation detects the signal based on Korotkoff sounds detected within an interval based on a peak of the oscillometric signal detected from the subject.

22. The detecting operation includes: determining whether the sound signal is a Korotkoff sound based on a ratio of frequency components included in a predetermined frequency band among frequency components of the sound signal collected from the subject; 18. The method of claim 17, wherein the signal is detected based on a sound signal determined to be a Korotkoff sound.

23. 23. The blood pressure measurement method of claim 22, wherein the act of detecting determines a sound signal in which the ratio is equal to or greater than a predetermined threshold ratio as the Korotkoff sound.

24. The detecting operation includes: determining whether the sound signal is a Korotkoff sound according to the amplitude of the sound signal collected from the subject; 18. The method of claim 17, wherein the signal is detected based on a sound signal determined to be a Korotkoff sound.

25. a cuff for detecting both Korotkoff sounds and oscillometric signals from the subject; a processor for measuring the subject's blood pressure using the Korotkoff sounds and the oscillometric signal; A blood pressure measuring device comprising:

26. 26. The blood pressure measurement device of claim 25, wherein the processor detects the Kortkoff sounds using the oscillometric signal and measures the blood pressure of the subject based on the detected Kortkoff sounds.

27. The blood pressure measurement device according to claim 25, wherein the Korotkoff sounds collected from the subject are output via a speaker.

28. a blood pressure measurement result in which the Korotkoff sounds and the oscillometric signal detected from the subject are synchronized and displayed is provided to the subject; 26. The blood pressure measurement device according to claim 25, wherein a visual mark indicating a reference Korotkoff sound corresponding to the subject's blood pressure is displayed from the blood pressure measurement result, or the reference Korotkoff sound is visually displayed.

29. The blood pressure measurement device according to claim 28, wherein the blood pressure measurement result is output in the form of a printed matter.

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