CN110720902B - Blood pressure measuring method and sphygmomanometer - Google Patents

Abstract

The invention discloses a blood pressure measuring method and a sphygmomanometer, wherein the audio information of the Korotkoff sounds of tissues to be measured and the pressure information of the tissues to be measured are obtained; screening a plurality of Korotkoff sounds in the audio information in the beginning time period, selecting the Korotkoff sound with the largest shellfish amplitude change in the plurality of Korotkoff sounds as a first Korotkoff sound, screening a plurality of Korotkoff sounds in the audio information in the ending time period, and selecting the Korotkoff sound with the largest shellfish amplitude change in the plurality of Korotkoff sounds as a second Korotkoff sound; determining a first time point corresponding to the first Korotkoff sound, determining a second time point corresponding to the second Korotkoff sound, determining a first pressure value of the tissue to be detected according to the first time point and the pressure information, and determining a second pressure value of the tissue to be detected according to the second time point and the pressure information, wherein the first pressure value and the second pressure value are the high pressure and the low pressure of the tissue to be detected, so that the problems that the sphygmomanometer is influenced by subjective factors and inaccurate in measurement are solved, and the accuracy of blood pressure measurement is improved.

Description

Blood pressure measuring method and sphygmomanometer

Technical Field

The invention relates to the field of medical equipment, in particular to a blood pressure measuring method and a sphygmomanometer.

Background

In the related art, there are two types of blood pressure meters, one is a mercury blood pressure meter, and the other is an electronic blood pressure meter (oscillometric method). The mercury sphygmomanometer measures blood pressure by adopting an auscultation method (Korotkoff sound method). Mainly comprises a balloon, a cuff and a pressure detector. The measurement method comprises inflating and pressurizing the cuff wound on the upper arm with balloon when measuring blood pressure, and applying pressure to brachial artery via soft tissue. When the pressure is higher than the systolic pressure, the balloon is deflated slowly, the pressure in the cuff is reduced, when the pressure in the cuff is equal to or slightly lower than the systolic pressure, blood can burst the blocked blood vessels to form vortex along with the systolic ejection of blood, the stethoscope begins to hear the pulsating sound, and the pressure value indicated by the pressure detector is equal to the systolic pressure. And continuously and slowly deflating to gradually reduce the pressure in the cuff, and when the pressure in the cuff is lower than the systolic pressure but higher than the diastolic pressure, the heart can hear a sound once per contraction. When the cuff pressure is reduced to be equal to or slightly lower than the diastolic pressure, the blood flow is unblocked, and the sound emitted along with the heartbeat is suddenly weakened or disappeared, and the pressure value indicated by the pressure detector corresponds to the diastolic pressure. The method measures the blood pressure through subjective judgment of a person, delay and misoperation of human response can cause inaccurate blood pressure measurement, the other oscillometric method is also called an oscillation method, the principle is that the inflation quantity of a cuff wound on an upper arm is automatically adjusted, the pressure is changed, blood flow has certain oscillation waves through blood vessels, the blood flow is received by a pressure sensor and is gradually deflated, the pressure and fluctuation detected by the pressure sensor are changed along with the change of the oscillation waves, the moment with the largest fluctuation is selected as a reference point, on the basis of the point, the fluctuation point with a certain value is searched forwards as the systolic pressure, the fluctuation point with a certain value is searched backwards as the diastolic pressure, and different manufacturers set the value differently. The clinical verification of the sphygmomanometer is designed by using an auscultatory method as a standard and using a statistical method, the method needs accumulation of a large amount of measurement data, and a proper fluctuation point is selected as systolic pressure and diastolic pressure by the statistical method, so that the measurement result is greatly influenced due to the difference of human body structures or body states, and the measurement is easy to cause inaccuracy.

Aiming at the problems that the sphygmomanometer is influenced by subjective factors and measurement is inaccurate in the related technology, an effective solution is not provided at present.

Disclosure of Invention

The invention provides a blood pressure measuring method and a sphygmomanometer, aiming at solving the problems that the sphygmomanometer is influenced by subjective factors and inaccurate in measurement in the related art.

According to an aspect of the present invention, there is provided a blood pressure measuring method, the method including:

acquiring audio information of Korotkoff sounds of tissues to be detected and pressure information of the tissues to be detected;

screening a plurality of Korotkoff sounds in the audio information in the beginning time period, selecting the Korotkoff sound with the largest shellfish amplitude change in the plurality of Korotkoff sounds as a first Korotkoff sound, screening a plurality of Korotkoff sounds in the audio information in the ending time period, and selecting the Korotkoff sound with the largest shellfish amplitude change in the plurality of Korotkoff sounds as a second Korotkoff sound;

determining a first time point corresponding to the first Korotkoff sound, determining a second time point corresponding to the second Korotkoff sound, determining a first pressure value of the tissue to be detected according to the first time point and the pressure information, and determining a second pressure value of the tissue to be detected according to the second time point and the pressure information, wherein the first pressure value and the second pressure value are the high pressure and the low pressure of the tissue to be detected.

In one embodiment, before the filtering the plurality of korotkoff sounds in the audio information for the starting time period, the method includes:

acquiring an oscillation wave of the tissue to be detected, selecting a fluctuation point of systolic pressure and a fluctuation point of diastolic pressure according to the maximum fluctuation moment of the oscillation wave as a reference point, determining a third time point corresponding to the fluctuation point of the systolic pressure, and determining a fourth time point corresponding to the fluctuation point of the diastolic pressure;

determining a first pressure test time point according to the first time point and the third time point, acquiring a third pressure value of the tissue to be tested at the first pressure test point, determining a second pressure test time point according to the second time point and the fourth time point, and acquiring a fourth pressure value of the tissue to be tested at the second pressure test point, wherein the third pressure value and the fourth pressure value are the high pressure and the low pressure of the tissue to be tested.

In one embodiment, the filtering the multiple kocurio sounds in the audio information in the beginning time period, the selecting the kocurio sound with the largest change in the decibel amplitude among the multiple kocurio sounds as the first kocurio sound, and the filtering the multiple kocurio sounds in the ending time period among the audio information, and the selecting the kocurio sound with the largest change in the decibel amplitude among the multiple kocurio sounds as the second kocurio sound includes:

and screening a plurality of Korotkoff sounds in the audio information in the beginning time period, selecting the Korotkoff sound with the largest bulbil among the Korotkoff sounds as a first Korotkoff sound, screening a plurality of Korotkoff sounds in the ending time period in the audio information, and selecting the Korotkoff sound with the largest bulbil among the Korotkoff sounds as a second Korotkoff sound.

In one embodiment, said obtaining said first and second pressure values comprises:

and sending the first pressure value and the second pressure value to a display device for displaying.

In one embodiment, the acquiring the audio information of the korotkoff sounds of the tissue to be detected and the pressure information of the tissue to be detected includes:

after the occurrence of the Korotkoff sounds of the tissue to be detected is detected, the audio information starts to be acquired, and after the disappearance of the Korotkoff sounds of the tissue to be detected is detected, the audio information is finished to be acquired;

and acquiring the pressure value of the tissue to be detected in the audio information at the time of occurrence of the Korotkoff sounds every time to generate the pressure information.

According to another aspect of the present invention, there is also provided a blood pressure monitor, including: the Korotkoff sound recognition device, the pressure sensor and the main control chip are arranged on the main control chip;

the Korotkoff sound identification device acquires audio information of Korotkoff sounds of tissues to be detected and sends the audio information to the main control chip;

the pressure sensor acquires pressure information of the tissue to be detected and sends the pressure information to the main control chip;

the main control chip screens multiple Korotkoff sounds in the audio information at the beginning time period, selects the Korotkoff sound with the largest variation of the decibel amplitude in the multiple Korotkoff sounds as a first Korotkoff sound, screens multiple Korotkoff sounds in the audio information at the ending time period, and selects the Korotkoff sound with the largest variation of the decibel amplitude in the multiple Korotkoff sounds as a second Korotkoff sound;

the main control chip determines a first time point corresponding to the first Korotkoff sound, determines a second time point corresponding to the second Korotkoff sound, determines a first pressure value of the tissue to be detected according to the first time point and the pressure information, and determines a second pressure value of the tissue to be detected according to the second time point and the pressure information, wherein the first pressure value and the second pressure value are the high pressure and the low pressure of the tissue to be detected.

In one embodiment, the sphygmomanometer further comprises an oscillatory wave sensor;

the oscillatory wave sensor acquires oscillatory waves of the tissue to be detected and sends information of the oscillatory waves to the main control chip, and the main control chip selects a fluctuation point of systolic pressure and a fluctuation point of diastolic pressure according to the maximum fluctuation moment of the oscillatory waves as a reference point, determines a third time point corresponding to the fluctuation point of the systolic pressure and determines a fourth time point corresponding to the fluctuation point of the diastolic pressure;

the main control chip determines a first pressure test time point according to the first time point and the third time point, acquires a third pressure value of the tissue to be tested at the first pressure test point, determines a second pressure test time point according to the second time point and the fourth time point, and acquires a fourth pressure value of the tissue to be tested at the second pressure test point, wherein the third pressure value and the fourth pressure value are the high pressure and the low pressure of the tissue to be tested.

In one embodiment, the main control chip screens a plurality of korotkoff sounds in the audio information in the beginning time period, selects a largest korotkoff sound among the plurality of korotkoff sounds as a first korotkoff sound, and the main control chip screens a plurality of korotkoff sounds in the audio information in the ending time period, and selects a largest korotkoff sound among the plurality of korotkoff sounds as a second korotkoff sound.

In one embodiment, after the main control chip obtains the first pressure value and the second pressure value, the main control chip sends the first pressure value and the second pressure value to a display device for displaying.

In one embodiment, after the korotkoff sounds of the tissue to be detected appear, the audio information starts to be acquired, and after the korotkoff sounds of the tissue to be detected disappear, the audio information is finished to be acquired;

in the audio information, at the time of occurrence of every Korotkoff sound, the pressure sensor acquires the pressure value of the tissue to be detected to generate the pressure information

According to the invention, the audio information of the Korotkoff sounds of the tissue to be detected and the pressure information of the tissue to be detected are obtained; screening a plurality of Korotkoff sounds in the audio information in the beginning time period, selecting the Korotkoff sound with the largest shellfish amplitude change in the plurality of Korotkoff sounds as a first Korotkoff sound, screening a plurality of Korotkoff sounds in the audio information in the ending time period, and selecting the Korotkoff sound with the largest shellfish amplitude change in the plurality of Korotkoff sounds as a second Korotkoff sound; determining a first time point corresponding to the first Korotkoff sound, determining a second time point corresponding to the second Korotkoff sound, determining a first pressure value of the tissue to be detected according to the first time point and the pressure information, and determining a second pressure value of the tissue to be detected according to the second time point and the pressure information, wherein the first pressure value and the second pressure value are the high pressure and the low pressure of the tissue to be detected, so that the problems that the sphygmomanometer is influenced by subjective factors and measurement is inaccurate are solved, and the accuracy of blood pressure measurement is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a first schematic block diagram of a blood pressure monitor according to an embodiment of the present invention;

FIG. 2 is a schematic block diagram of a sphygmomanometer according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a Korotkoff sound collection curve according to an embodiment of the present invention;

FIG. 4 is a first flowchart of a blood pressure measurement method according to an embodiment of the present invention;

fig. 5 is a second flowchart of a blood pressure measuring method according to an embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

An embodiment of the present invention provides a blood pressure monitor, fig. 1 is a schematic diagram of a schematic block diagram of the blood pressure monitor according to the embodiment of the present invention, as shown in fig. 1, the blood pressure monitor mainly includes: the Korotkoff sound recognition device 11, thepressure sensor 12, thepower supply module 13, the charging anddischarging control system 14, the liquidcrystal display screen 15 and themain control chip 16. Themain control chip 16 is a chip dedicated to the auscultation electronic sphygmomanometer, and is internally integrated with a constant current source/constant voltage source, an instrument amplifier, a band-pass filter, a signal amplifier, an analog-to-digital converter and a single chip microcomputer core processor, and themain control chip 16 omits an external analog-to-digital conversion circuit, a filter circuit and an amplification circuit. The Korotkoff sound recognition device 11 and thepressure sensor 12 are arranged in a cuff of the sphygmomanometer and are in communication connection with themain control chip 16, thepower module 13 can be externally connected with a power supply, the sphygmomanometer can also be supplied with power through 4 sections of 1.5V dry batteries, themain control chip 16 picks up Korotkoff sounds through the Korotkoff sound recognition device 11, meanwhile, themain control chip 16 controls inflation and deflation of the cuff by whether the Korotkoff sounds can be picked up or not, when the Korotkoff sounds appear, themain control chip 16 records a pressure value detected by thepressure sensor 12 when the Korotkoff sounds appear each time, and finally, systolic pressure and diastolic pressure are displayed on the liquidcrystal display screen 15 for a user to read. In the embodiment, the system composed of the Korotkoff sound recognition device 11, themain control chip 16 and the software algorithm is used for automatically picking up Korotkoff sounds, the system automatically extracts all sounds before the audio appears and disappears, two points with the maximum relative sound at the beginning and the end are taken as the appearance and the end points of the Korotkoff sounds, the pressure values detected by thepressure sensor 12 at the two points are recorded and displayed on the liquidcrystal display screen 15 as high pressure and low pressure, and the accuracy and the precision are higher. Meanwhile, an analog-digital conversion circuit, a filter circuit, an amplifying circuit and a loudspeaker module outside themain control chip 16 are omitted, the area and complexity of a main board are greatly reduced, and the internal space and weight of the sphygmomanometer are saved. The user only needs to tie up the cuff and press the start key, the blood pressure is automatically measured in the whole process, the Korotkoff sounds are intelligently identified by the Korotkoff sound identification device 11 and themain control chip 16, the corresponding pressure value is determined, and the user only needs to wait for the measurement to be completed and directly read the blood pressure value.

An embodiment of the present invention also provides a sphygmomanometer, including: the Korotkoff sound recognition device 11, thepressure sensor 12 and themain control chip 16;

the korotkoff sound recognition device 11 obtains audio information of korotkoff sounds of tissues to be detected, and sends the audio information to themain control chip 16, wherein the audio information can be analog signals which are directly collected, and themain control chip 16 is internally provided with an analog-to-digital conversion circuit, a filter circuit and an amplification circuit, and can convert the analog signals into digital signals which can be recognized by themain control chip 16.

Thepressure sensor 12 obtains pressure information of the tissue to be detected, and sends the pressure information to themain control chip 16, the pressure information may also be an analog signal directly collected, and themain control chip 16 is internally provided with an analog-to-digital conversion circuit, a filter circuit and an amplification circuit, and can convert the analog signal into a digital signal which can be identified by themain control chip 16.

Themain control chip 16 screens a plurality of korotkoff sounds in the audio information at the beginning time period, selects a korotkoff sound with the largest variation in the most common bass sounds as a first korotkoff sound, screens a plurality of korotkoff sounds in the ending time period in the audio information, and selects a korotkoff sound with the largest variation in the most common bass sounds as a second korotkoff sound, wherein the korotkoff sound with the largest variation in the most common bass sounds is a korotkoff sound whose occurrence is changed from a lower decibel to a higher decibel, or a korotkoff sound whose occurrence is changed from a higher decibel to a lower decibel, so that the first korotkoff sound after being changed can be selected as the first korotkoff sound or the second korotkoff sound, and the last korotkoff sound before being changed can be selected as the first korotkoff sound or the second korotkoff sound.

Themain control chip 16 determines a first time point corresponding to the first korotkoff sound, determines a second time point corresponding to the second korotkoff sound, determines a first pressure value of the tissue to be detected according to the first time point and the pressure information, and determines a second pressure value of the tissue to be detected according to the second time point and the pressure information, wherein the first pressure value and the second pressure value are high pressure and low pressure of the tissue to be detected.

Through the sphygmomanometer in the embodiment, the Korotkoff sound recognition device 11 and themain control chip 16 intelligently recognize and determine the pressure value corresponding to the Korotkoff sound, the first Korotkoff sound and the second Korotkoff sound are determined through the optimal selection of the occurrence time of the systolic pressure and the diastolic pressure corresponding to the Korotkoff sound, the pressure value obtained by thepressure sensor 12 at the time of the first Korotkoff sound and the second Korotkoff sound is obtained, the pressure value corresponds to the high pressure and the low pressure of the tissue to be detected, the subjective judgment of blood pressure detection personnel is not needed, the problem that the sphygmomanometer is influenced by subjective factors and inaccurate in measurement is solved, and the accuracy of blood pressure measurement is improved.

Fig. 2 is a schematic diagram of a schematic block diagram of a sphygmomanometer according to an embodiment of the present invention, as shown in fig. 2, the sphygmomanometer further includes anoscillation wave sensor 21, where theoscillation wave sensor 21 may be a single pressure sensor to obtain a pressure oscillation wave of a tissue to be measured, or may also obtain an oscillation wave of the tissue to be measured through thepressure sensor 12 in fig. 1;

theoscillatory wave sensor 21 obtains the oscillatory wave of the tissue to be measured, and sends the information of the oscillatory wave to themain control chip 16, themain control chip 16 selects the fluctuation point of the systolic pressure and the fluctuation point of the diastolic pressure according to the maximum fluctuation time of the oscillatory wave as a reference point, determines the third time point corresponding to the fluctuation point of the systolic pressure, and determines the fourth time point corresponding to the fluctuation point of the diastolic pressure, for example, extracts the oscillatory wave peak value sequence fitting oscillatory wave envelope curve, finds out the maximum value point of the amplitude, obtains the ratio of the oscillatory wave amplitude of the fluctuation point of the systolic pressure to the maximum fluctuation amplitude between 0.4-0.7 through data statistics and experience values, the ratio of the oscillatory wave amplitude of the diastolic pressure fluctuation point to the maximum fluctuation amplitude between 0.4-0.8, and can determine the third time point corresponding to the fluctuation point of the systolic pressure in the above ratio interval, and determining a fourth time point corresponding to the fluctuation point of the diastolic pressure.

The fluctuation point of the systolic pressure and the diastolic pressure of the oscillatory wave, and the korotkoff sound of the systolic pressure and the diastolic pressure can be used as the basis for the sphygmomanometer to test the systolic pressure and the diastolic pressure at any time, in order to further improve the accuracy of the blood pressure measurement, the blood pressure measurement can be realized by combining the two, the main control chip 16 can determine a first pressure test time point according to the first time point and the third time point, obtain a third pressure value of the tissue to be tested at the first pressure test point, determine a second pressure test time point according to the second time point and the fourth time point, obtain a fourth pressure value of the tissue to be tested at the second pressure test point, wherein the third pressure value and the fourth pressure value are the high pressure and the low pressure of the tissue to be tested, in the above specific implementation manner, the time point of the fluctuation point and the time point of the korotkoff sound can be compared, and the comparison result is within a certain threshold time range, the acquisition of the oscillatory wave and the Korotkoff sound is proved to be accurate, and the average time point of the oscillatory wave and the Korotkoff sound or the time point of one of the oscillatory wave and the Korotkoff sound can be taken as the pressure acquisition time of the systolic pressure or the diastolic pressure.

In an embodiment, how to determine the korotkoff sounds of the systolic pressure and the diastolic pressure is further optimized, themain control chip 16 screens a plurality of korotkoff sounds in the audio information in a starting time period, selects a largest korotkoff sound among the plurality of korotkoff sounds as a first korotkoff sound, themain control chip 16 screens a plurality of korotkoff sounds in an ending time period in the audio information, and selects a largest korotkoff sound among the plurality of korotkoff sounds as a second korotkoff sound, for example, fig. 3 is a schematic view of a korotkoff sound acquisition curve according to an embodiment of the present invention, as shown in fig. 3, the korotkoff sounds in the audio information occur 9 times in total, the maximum values of the first three points and the last three points are taken at the beginning and the end respectively, the occurrence time of the korotkoff sound is 26 db of T3, the ending time is 22 db of T8, and the pressure values corresponding to the two points are taken as high and low pressures, which is the same as the principle of manual listening method, the accuracy of the blood pressure test will be higher.

In an embodiment, after themain control chip 16 obtains the first pressure value and the second pressure value, the first pressure value and the second pressure value are sent to the liquidcrystal display device 15 for displaying, the displayed content is not limited to only display the systolic pressure corresponding to the first pressure value and the diastolic pressure corresponding to the second pressure value, and history information of the blood pressure can also be displayed, and according to the comparison between the measured systolic pressure and diastolic pressure and normal high and low pressures, the comparison result is fed back to the liquidcrystal display device 15 for displaying, so as to indicate whether the blood pressure measurement of the user is normal.

In an embodiment, themain control chip 16 may set a time period in which to acquire the audio information and the pressure information, for example, after the korotkoff sound recognition device 11 detects that korotkoff sound of the tissue to be detected appears, the audio information starts to be acquired, and after detecting that korotkoff sound of the tissue to be detected disappears, the audio information ends to be acquired; in addition, the pressure information of thepressure sensor 12 can be synchronized with the time when the korotkoff sound recognition device 11 acquires korotkoff sound audio information, in the audio information, at the time when each korotkoff sound appears, thepressure sensor 12 acquires the pressure value of the tissue to be detected to generate the pressure information, and after synchronization, the consumption of electric quantity can be further saved, and the service life of a battery in the sphygmomanometer can be prolonged.

In an embodiment of the present invention, a blood pressure measuring method is provided, and fig. 4 is a flowchart of a blood pressure measuring method according to an embodiment of the present invention, as shown in fig. 4, the method includes the following steps:

step S402, acquiring the audio information of the Korotkoff sounds of the tissue to be detected and the pressure information of the tissue to be detected;

step S404, a plurality of Korotkoff sounds in the audio information in the beginning time period are screened, the Korotkoff sound with the largest variation of the decibel amplitude in the plurality of Korotkoff sounds is selected as a first Korotkoff sound, a plurality of Korotkoff sounds in the audio information in the ending time period are screened, and the Korotkoff sound with the largest variation of the decibel amplitude in the plurality of Korotkoff sounds is selected as a second Korotkoff sound;

step S406, determining a first time point corresponding to the first korotkoff sound, determining a second time point corresponding to the second korotkoff sound, determining a first pressure value of the tissue to be detected according to the first time point and the pressure information, and determining a second pressure value of the tissue to be detected according to the second time point and the pressure information, wherein the first pressure value and the second pressure value are high and low pressures of the tissue to be detected.

Through the steps S402 to S406, the korotkoff sound recognition device 11 and themain control chip 16 intelligently recognize and determine the pressure value corresponding to the korotkoff sound, without subjective judgment of blood pressure detection personnel, so that the problems that the sphygmomanometer is influenced by subjective factors and measurement is inaccurate are solved, and the accuracy of blood pressure measurement is improved.

In an embodiment of the present invention, a blood pressure measuring method is provided, and fig. 5 is a flowchart of a blood pressure measuring method according to an embodiment of the present invention, as shown in fig. 5, on the basis of step S402 and step S404, the method further includes the following steps:

step S502, acquiring the oscillatory wave of the tissue to be detected, selecting a fluctuation point of systolic pressure and a fluctuation point of diastolic pressure according to the maximum fluctuation moment of the oscillatory wave as a reference point, determining a third time point corresponding to the fluctuation point of the systolic pressure, and determining a fourth time point corresponding to the fluctuation point of the diastolic pressure;

step S504, determining a first pressure testing time point according to the first time point and the third time point, obtaining a third pressure value of the tissue to be tested at the first pressure testing point, determining a second pressure testing time point according to the second time point and the fourth time point, and obtaining a fourth pressure value of the tissue to be tested at the second pressure testing point, wherein the third pressure value and the fourth pressure value are high and low pressures of the tissue to be tested.

Through the steps S502 to S504, the two pressure measurement time determination methods of the oscillatory wave and the Korotkoff sound are combined, the time points for testing the systolic pressure and the diastolic pressure are more accurately determined, and therefore the accuracy of blood pressure measurement is further improved.

According to another aspect of the present invention, there is also provided a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the above-mentioned blood pressure measuring method.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (3)

1. A sphygmomanometer, characterized by comprising: the system comprises a Korotkoff sound recognition device, a pressure sensor, an oscillation wave sensor and a main control chip;

the Korotkoff sound identification device acquires audio information of Korotkoff sounds of tissues to be detected and sends the audio information to the main control chip;

the pressure sensor acquires pressure information of the tissue to be detected and sends the pressure information to the main control chip;

the oscillatory wave sensor acquires oscillatory waves of the tissue to be detected and sends information of the oscillatory waves to the main control chip;

the main control chip screens multiple Korotkoff sounds in the audio information at the beginning time period, selects the Korotkoff sound with the largest variation of the decibel amplitude in the multiple Korotkoff sounds as a first Korotkoff sound, screens multiple Korotkoff sounds in the audio information at the ending time period, and selects the Korotkoff sound with the largest variation of the decibel amplitude in the multiple Korotkoff sounds as a second Korotkoff sound;

the main control chip determines a first time point corresponding to the first Korotkoff sound and determines a second time point corresponding to the second Korotkoff sound;

the main control chip selects a fluctuation point of systolic pressure and a fluctuation point of diastolic pressure according to the maximum fluctuation moment of the oscillation wave as a reference point, determines a third time point corresponding to the fluctuation point of the systolic pressure, and determines a fourth time point corresponding to the fluctuation point of the diastolic pressure;

the main control chip determines a first pressure test time point according to the first time point and the average time point of the third time point, acquires a third pressure value of the tissue to be tested at the first pressure test time point, determines a second pressure test time point according to the second time point and the average time point of the fourth time point, acquires a fourth pressure value of the tissue to be tested at the second pressure test time point, wherein the third pressure value and the fourth pressure value are the high pressure and the low pressure of the tissue to be tested.

2. The sphygmomanometer according to claim 1, wherein the main control chip screens a plurality of korotkoff sounds in the audio information at a start time period, selects a largest korotkoff sound among the plurality of korotkoff sounds as a first korotkoff sound, and the main control chip screens a plurality of korotkoff sounds in the audio information at an end time period, and selects a largest korotkoff sound among the plurality of korotkoff sounds as a second korotkoff sound.

3. The sphygmomanometer according to any one of claims 1 to 2, wherein the audio information starts to be acquired after the korotkoff sound of the tissue to be measured appears, and ends to be acquired after the korotkoff sound of the tissue to be measured disappears;

in the audio information, at the time of occurrence of each Korotkoff sound, the pressure sensor acquires the pressure value of the tissue to be detected to generate the pressure information.

Images