CN107049290B - Dynamic blood pressure measuring method and system - Google Patents
Dynamic blood pressure measuring method and system Download PDFInfo
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- CN107049290B CN107049290B CN201710250378.0A CN201710250378A CN107049290B CN 107049290 B CN107049290 B CN 107049290B CN 201710250378 A CN201710250378 A CN 201710250378A CN 107049290 B CN107049290 B CN 107049290B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
- A61B5/0225—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/02108—Measuring pressure in heart or blood vessels from analysis of pulse wave characteristics
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
Abstract
The embodiment of the invention provides a dynamic blood pressure measuring method and system, and relates to the technical field of electronics. The embodiment of the invention controls the pressure value of the air bag to rise at a constant speed by dynamically adjusting the rotating speed of the pump, obtains the pressure value based on the pressure sensor in the pressurizing process, filters the pressure value to obtain the pulse wave, identifies the peak point of the pulse wave, judges whether the current pressure value of the air bag is greater than or equal to the pre-judged pressurizing value by adopting a step judgment mode, stops pressurizing when the current pressure value of the air bag is greater than or equal to the pre-judged pressurizing value, and determines the systolic pressure and the diastolic pressure based on the peak point of the pulse wave. The blood pressure is measured in the pressurizing process, the time for the upper arm to be stressed and the measuring time are reduced, the error of the measuring result caused by the fact that the blood vessel of the user cannot be timely recovered due to long-time compression is reduced, and the using comfort of the user is improved; the constant-speed stable pressurization is used in the process of measuring the blood pressure, and the blood pressure is pressurized to a proper pressurization value individually according to the blood pressure of a user, so that the measurement accuracy is improved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a dynamic blood pressure measuring method and system.
Background
Along with the continuous development and progress of modern medicine, the attention degree of people to health is higher and higher, hypertension and hypotension can all cause certain harm to the human body, and the method of measuring blood pressure mainly has korotkoff sound method, invariable volume method, oscillometric method etc. nowadays, because the method of oscillometric method for measuring blood pressure is simple, the result is more accurate, easily carry, interference immunity and repeatability are strong, therefore apply to the electronic sphygmomanometer in a large number.
At present, the electronic sphygmomanometer can realize dynamic blood pressure measurement, firstly, the electronic sphygmomanometer quickly pressurizes a certain pressure value and then slowly discharges gas in an air bag, pulse waves are obtained in the pressure reduction process, and the blood pressure is calculated through the pulse waves.
When the inventor applies the prior art, the inventor finds that the upper arm of the prior art is subjected to larger pressure for a long time by adopting a method for measuring blood pressure by reducing blood pressure, so that the blood vessel of a user, particularly the old people, can not be timely recovered due to compression, and the measurement result has errors; the user has long measurement time, which causes discomfort for the user.
Disclosure of Invention
In view of the above, the present invention has been made to provide a dynamic blood pressure measuring method and a corresponding dynamic blood pressure measuring system that overcome or at least partially solve the above-mentioned problems.
According to an aspect of the present invention, there is provided a dynamic blood pressure measuring method including:
the rotating speed of the pump is dynamically adjusted to control the pressure value of the air bag to rise at a constant speed;
acquiring a pressure value based on a pressure sensor in the pressurizing process;
filtering the pressure value to obtain a pulse wave, and identifying a peak point of the pulse wave;
when the current pressure value of the air bag is equal to a first threshold value, starting to judge whether the current pressure value of the air bag is greater than or equal to a pre-judgment pressurization value;
when the current pressure value of the air bag is smaller than a pre-judgment pressurization value, on the basis of a first threshold value, when the rising pressure value of the air bag is equal to N times of a second threshold value, judging for the (N + 1) th time, and determining whether the current pressure value of the air bag is larger than or equal to the pre-judgment pressurization value; n is an integer greater than or equal to 1;
when the current pressure value of the air bag is greater than or equal to the pre-judged pressurization value, the pressurization is stopped;
determining systolic pressure and diastolic pressure based on the peak point of the pulse wave.
Preferably, the step of controlling the pressure value of the air bag to rise at a constant speed by dynamically adjusting the rotation speed of the pump includes:
dynamically adjusting the rotating speed of the pump based on the variable quantity of the duty ratio of the pin of the control chip;
and controlling the pressure value of the air bag to rise at a constant speed based on the rotating speed of the pump.
Preferably, the amount of change in the duty ratio is related to a current pressure value and a current pressurizing speed of the airbag.
Preferably, the step of stopping pressurization when the current pressure value of the airbag is greater than or equal to a predetermined pressurization value includes:
and stopping pressurizing when the current pressure value of the air bag is greater than or equal to 280 mmHg.
Preferably, the step of stopping pressurization when the current pressure value of the airbag is greater than or equal to a predetermined pressurization value further includes:
and stopping pressurizing when the current pressure value of the air bag is more than or equal to the pressurizing value corresponding to the sum of 20mmHg and 1.2 times of the pressure value corresponding to the highest peak point of the pulse wave.
Preferably, the step of stopping pressurization when the current pressure value of the airbag is greater than or equal to a predetermined pressurization value further includes:
and when the ratio of the peak point corresponding to the two continuous pulse waves collected after the pulse wave corresponding to the highest peak point is respectively less than 0.5 and 0.4, stopping pressurizing.
According to another aspect of the present invention, there is provided a dynamic blood pressure measuring system including: a control chip, a pressure sensor, an air bag and a pump;
the control chip includes:
the rotating speed adjusting unit is used for controlling the pressure value of the air bag to rise at a constant speed by dynamically adjusting the rotating speed of the pump;
the signal acquisition unit is used for acquiring a pressure value based on the pressure sensor in the pressurizing process;
the signal processing unit is used for filtering the pressure value to obtain a pulse wave and identifying a peak point of the pulse wave;
the first judgment unit is used for starting to judge whether the current pressure value of the air bag is greater than or equal to a pre-judgment pressurization value or not when the current pressure value of the air bag is equal to a first threshold value;
the second judgment unit is used for judging for the (N + 1) th time when the current pressure value of the air bag is smaller than the pre-judgment pressurization value and the rising pressure value of the air bag is equal to N times of a second threshold value on the basis of the first threshold value, and determining whether the current pressure value of the air bag is larger than or equal to the pre-judgment pressurization value or not; n is an integer greater than or equal to 1;
the pressurization control unit is used for stopping pressurization when the current pressure value of the air bag is greater than or equal to a pre-judged pressurization value;
and the calculating unit is used for determining the systolic pressure and the diastolic pressure based on the peak point of the pulse wave.
Preferably, the rotation speed adjusting unit includes:
the dynamic adjusting unit is used for dynamically adjusting the rotating speed of the pump based on the variable quantity of the duty ratio of the pin of the control chip;
and the pressure value control unit is used for controlling the pressure value of the air bag to rise at a constant speed based on the rotating speed of the pump.
Preferably, the amount of change in the duty ratio is related to a current pressure value and a current pressurizing speed of the airbag.
Preferably, the pressurization control unit includes:
and the first pressurization control subunit is used for stopping pressurization when the current pressure value of the air bag is greater than or equal to 280 mmHg.
Preferably, the pressurization control unit further includes:
and the second pressurization control subunit is used for stopping pressurization when the current pressure value of the air bag is greater than or equal to the pressurization value corresponding to the sum of 20mmHg and 1.2 times of the pressure value corresponding to the highest peak point of the pulse wave.
Preferably, the pressurization control unit further includes:
and the third pressurization control subunit is used for stopping pressurization when the ratio of the corresponding peak point to the highest peak point of two continuous pulse waves collected after the pulse wave corresponding to the highest peak point is respectively less than 0.5 and 0.4.
Compared with the prior art, the invention has the following advantages:
according to the dynamic blood pressure measuring method and the dynamic blood pressure measuring system, the rotating speed of a pump is dynamically adjusted to control the pressure value of an air bag to rise at a constant speed, in the pressurizing process, the pressure value is obtained based on a pressure sensor, the pressure value is filtered to obtain the pulse wave, the peak point of the pulse wave is identified, when the current pressure value of the air bag is equal to a first threshold value, whether the current pressure value of the air bag is larger than or equal to a pre-judged pressurizing value or not is judged, when the current pressure value of the air bag is smaller than the pre-judged pressurizing value, the rising pressure value of the air bag is equal to N times of a second threshold value on the basis of the first threshold value, judgment is carried out for the (N + 1) th time, whether the current pressure value of the air bag is larger than or equal to the pre-judged pressurizing value or not is determined, when the current pressure value of the air bag is larger than or equal, systolic and diastolic pressures are determined. The blood pressure is measured in the pressurizing process, the time for the upper arm to be stressed and the measuring time are reduced, the error of a measuring result caused by the fact that the blood vessel of a user cannot be timely recovered due to long-time compression is reduced, and the using comfort level and the measuring accuracy of the user are improved; the constant-speed stable pressurization is used in the process of measuring the blood pressure, and the blood pressure is pressurized to a proper pressurization value individually according to the blood pressure of a user, so that the measurement accuracy is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart of an embodiment of a method for measuring dynamic blood pressure according to the present invention;
FIG. 2 is a schematic diagram showing the rise in bladder pressure during pressurization;
FIG. 3 is a schematic diagram illustrating a staircase approach;
FIG. 4 is a flowchart illustrating an embodiment of a method for measuring dynamic blood pressure according to a second embodiment of the present invention;
FIG. 5 is a block diagram illustrating an embodiment of a dynamic blood pressure measuring system according to a third embodiment of the present invention;
fig. 6 shows a block diagram of an embodiment of a dynamic blood pressure measuring system according to a fourth embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Example one
Referring to fig. 1, a flowchart of an embodiment of a dynamic blood pressure measuring method according to an embodiment of the present invention is shown, which may specifically include the following steps:
and 101, dynamically adjusting the rotating speed of the pump to control the pressure value of the air bag to rise at a constant speed.
In the embodiment of the invention, the whole pressurizing process can be divided into three stages, namely an early stage, a middle stage and a later stage. The stage of the initial pressurization belongs to the early stage, because the air bag has no gas when the initial pressurization is carried out, the air bag needs to be inflated firstly, if the rotation speed of the pump is fixed, the initial inflation time is longer, and the pressure value in the air bag rises slowly, therefore, the rotation speed of the pump is adjusted to be larger when the initial pressurization is carried out, the pressure value of the air bag is controlled to rise rapidly, when the pressurization is carried out to 10mmHg or the pressurization speed reaches 2mmHg/s, the rotation speed of the pump is reduced in a step mode, and the shaking interference caused by the reduction of the initial pressurization time and the rotation speed of the pump is reduced. When the pressure value of the air bag is in the middle stage of the pressurizing process, if the rotating speed of the pump is fixed, the rising speed of the pressure value of the air bag is accelerated, and the situation that the rising speed is too high may occur in the middle stage, so that the rotating speed of the pump needs to be dynamically adjusted, and the pressure value of the air bag is controlled to rise at a constant speed. When the pressure value of the air bag is increased, the air pressure value of the air bag is increased, and the air pressure value of the air bag is increased.
Referring to fig. 2, a schematic diagram of the bladder pressure rise during pressurization is shown.
As shown in fig. 2, the abscissa is the time T of pressurization in units of s, and the ordinate is the pressure value of the airbag in units of mmHg; curve 21 is the existing pressurizing method, which adopts a fixed pump speed, the pressure value in the air bag rises slowly in the early stage of pressurization, the pressure value of the air bag rises quickly in the middle stage of pressurization, and the pressure value of the air bag rises slowly in the later stage of pressurization; 22 is the relationship of the pressure value of the air bag obtained by adopting the uniform-speed stable pressurization method along with the change of the pressurization time, in the early stage of pressurization, the pump is adjusted to have a larger rotating speed to control the pressure value of the air bag to rapidly rise, when the pressurization reaches 10mmHg or the pressurization speed reaches 2mmHg/s, the pressure value of the air bag is controlled to uniformly rise, and in the middle stage and the later stage of pressurization, the rotating speed of the pump is dynamically adjusted to control the pressure value of the air bag to uniformly rise.
In the embodiment of the invention, the pressure value of the air bag is controlled to rise at a constant speed by the pressurizing method, the air bag is pressurized until the pressurizing is finished by dynamically adjusting the rotating speed of the pump, and the pump is not stopped in the middle process, so that the loss of the pump is reduced. In the pressurizing process, a pressure value is obtained through the pressure sensor, and the obtained pressure value is sent to the control chip.
And 103, filtering the pressure value to obtain a pulse wave, and identifying a peak point of the pulse wave.
In the embodiment of the invention, after the pressure value is obtained by the control chip, the pressure value is filtered, the pressure value of the air bag and the pressure value caused by interference are filtered, and the pulse wave is obtained, wherein the frequency of the pulse wave is between 0.5 and 10HZ, so that the interference pressure value with the frequency above 10HZ needs to be filtered, and the pressure value of the air bag rises at a constant speed, so that the influence caused by the pressure value of the air bag can be directly filtered. And then, identifying peak points of the pulse wave based on the obtained pulse wave, and storing all the acquired peak points to facilitate subsequent calculation of systolic pressure and diastolic pressure.
Because the uniform and stable pressurization is adopted, the obtained pulse waves are uniformly distributed, and the calculation result is more accurate when the systolic pressure and the diastolic pressure are calculated in the follow-up process.
And 104, when the current pressure value of the air bag is equal to a first threshold value, starting to judge whether the current pressure value of the air bag is greater than or equal to a pre-judged pressurization value.
In the embodiment of the invention, when the current pressure value of the air bag is equal to the first threshold value, the first judgment is started, and whether the current pressure value of the air bag is greater than or equal to the pre-judgment pressurization value or not is determined.
When the current pressure value of the air bag is equal to the first threshold value, filtering interference points of all identified peak points of the pulse wave, smoothing the interference points, replacing the interference points with the mean value of the points around the interference points, removing interference, improving anti-interference performance and improving measurement accuracy.
For example, the first threshold value is 100mmHg, and when the current pressure value of the airbag is 100mmHg, a first judgment is made to determine whether the current pressure value of the airbag, 100mmHg, is greater than or equal to the pre-judgment pressurization value.
105, when the current pressure value of the air bag is smaller than a pre-judgment pressurization value and the rising pressure value of the air bag is equal to N times of a second threshold value on the basis of a first threshold value, judging for the (N + 1) th time to determine whether the current pressure value of the air bag is larger than or equal to the pre-judgment pressurization value; and N is an integer greater than or equal to 1.
In the embodiment of the invention, whether the current pressure value of the air bag is pressurized to a proper pressurization value is judged in a step judgment mode. During the first judgment, if the current pressure value of the air bag is smaller than the pre-judgment pressurization value, continuing pressurization on the basis of the first threshold value, and when the rising pressure value of the air bag is equal to the second threshold value, performing the second judgment to determine whether the current pressure value of the air bag is larger than or equal to the pre-judgment pressurization value; if the current pressure value of the air bag is smaller than the pre-judged pressurization value, the pressurization is continued, and on the basis of the first threshold value, when the rising pressure value of the air bag is equal to 2 times of the second threshold value, the third judgment is carried out to determine whether the current pressure value of the air bag is larger than or equal to the pre-judged pressurization value. According to the pressurization judging mode, when the current pressure value of the air bag is smaller than the pre-judged pressurization value, the pressurization is continued, on the basis of the first threshold value, when the rising pressure value of the air bag is equal to N times of the second threshold value, judgment is carried out for the (N + 1) th time, whether the current pressure value of the air bag is larger than or equal to the pre-judged pressurization value or not is determined, wherein N is an integer larger than or equal to 1, and the pressurization is stopped until the current pressure value of the air bag is judged to be larger than or equal to the pre-judged pressurization value. The pre-judged pressurization value is a proper pressurization value pre-judged according to the blood pressure of the user, and the blood pressure of the user is pressurized to the proper pressurization value in an individualized way, so that the measurement accuracy is improved.
For example, the first threshold value is 100mmHg, the second threshold value is 10mmHg, if the current pressure value of the air bag is 100mmHg smaller than the predetermined pressurization value, the pressurization is continued, and if the current pressure value of the air bag is 110mmHg, the second judgment is performed to determine whether the current pressure value of the air bag is 110mmHg larger than or equal to the predetermined pressurization value; if the current pressure value of the air bag is smaller than the pre-judged pressurization value, the pressurization is continued, when the current pressure value of the air bag is 120mmHg, the third judgment is carried out, and the pressurization is stopped until the current pressure value of the air bag is judged to be larger than or equal to the pre-judged pressurization value.
Referring to fig. 3, a schematic diagram of a staircase decision manner is shown.
As shown in fig. 3, when the pressure of the airbag reaches 100mmHg, the acquired peak point is determined every 10mmHg, and it is determined whether or not the predicted pressure value is reached. In the stage (a), the current pressure value of the corresponding air bag is 100mmHg, the collected peak value point is in the rising trend, the pressurization is continued, and the judgment is carried out again at the next 10 mmHg; in the stage (b), the current pressure value of the corresponding air bag is 120mmHg, and at the moment, an interference point is found to appear in the pressurizing process, the interference point is subjected to smoothing treatment, the mean value of points around the interference point is used for replacing the interference point, the interference is removed, and the anti-interference performance is improved; in the stage (c), if the current pressure value of the corresponding air bag is 140mmHg and the collected peak value point still shows an ascending trend, continuously pressurizing, and judging again at the next 10 mmHg; in the stage (d), the current pressure value of the corresponding air bag is 160mmHg, the acquired peak point is in a descending trend, a pre-judgment pressurization value is estimated according to the waveform of the pulse wave, the current pressure value of the air bag is judged not to reach the pre-judgment pressurization value, pressurization is continued, and judgment is carried out again at the next 10 mmHg; and (e) judging that the current pressure value of the air bag reaches a pre-judgment pressurization value and stopping pressurization according to the current pressure value of the air bag being 170 mmHg.
And 106, stopping pressurizing when the current pressure value of the air bag is greater than or equal to the pre-judged pressurizing value.
In the embodiment of the invention, when the current pressure value of the air bag is greater than or equal to the pre-judged pressurization value, the pressurization is stopped, the gas in the air bag is directly discharged, and the depressurization process is not needed.
And step 107, determining systolic pressure and diastolic pressure based on the peak point of the pulse wave.
In the embodiment of the invention, an envelope curve is obtained based on all peak points according to all stored peak points of the pulse wave, the geometric shape of the envelope curve is analyzed, the pressure value corresponding to the highest point of the envelope curve is the average pressure, and the systolic pressure and the diastolic pressure are calculated by the average pressure through a ratio method or an inflection point method. The specific algorithm is similar to the prior art principle and will not be described in detail here.
The heart rate can be calculated according to the number of waveforms of the pulse wave in a period of time.
Compared with the prior art, the embodiment of the invention has the following advantages:
the embodiment of the invention controls the pressure value of the air bag to rise at a constant speed by dynamically adjusting the rotating speed of the pump, obtains the pressure value based on the pressure sensor in the pressurizing process, filtering the pressure value to obtain a pulse wave, identifying a peak point of the pulse wave, and when the current pressure value of the air bag is equal to a first threshold value, starting to judge whether the current pressure value of the air bag is larger than or equal to a pre-judging pressurization value or not, when the current pressure value of the air bag is smaller than the pre-judging pressurization value, on the basis of the first threshold value, when the rising pressure value of the air bag is equal to N times of the second threshold value, judging for the (N + 1) th time, determining whether the current pressure value of the air bag is greater than or equal to a pre-judgment pressurization value, and when the current pressure value of the air bag is greater than or equal to a pre-judged pressurization value, stopping pressurization, and determining the systolic pressure and the diastolic pressure based on the peak point of the pulse wave. The blood pressure is measured in the pressurizing process, the time for the upper arm to be stressed and the measuring time are reduced, the error of a measuring result caused by the fact that the blood vessel of a user cannot be timely recovered due to long-time compression is reduced, and the using comfort level and the measuring accuracy of the user are improved; the constant-speed stable pressurization is used in the process of measuring the blood pressure, and the blood pressure is pressurized to a proper pressurization value individually according to the blood pressure of a user, so that the measurement accuracy is improved.
Example two
Referring to fig. 4, a flowchart of an embodiment of a method for measuring dynamic blood pressure according to a second embodiment of the present invention is shown, which may specifically include the following steps:
In the embodiment of the invention, the rotating speed of the pump is controlled by controlling the duty ratio of the pump signal pin of the chip, and the variable quantity of the rotating speed of the pump is dynamically adjusted based on the variable quantity of the duty ratio of the pump signal pin of the control chip. The duty ratio is in direct proportion to the rotation speed of the pump, and when the duty ratio is larger, the rotation speed of the pump is larger; when the duty ratio is smaller, the pump rotation speed is smaller.
The duty cycle is the ratio of the time occupied by the pulse to the total time during a period of continuous operation. The change amount of the duty ratio is related to the current pressure value of the air bag and the current pressurizing speed.
The corresponding relation between the variation of duty ratio and the current pressure value and the current pressurizing speed of the air bag is △ D-0.004 XP-2 (V-V)0) Wherein △ D is the variation of duty ratio, P is the current pressure value of the air bag, V is the current pressurizing speed, and V is0In order to preset the stable speed, the preset stable speed may be 6mmHg/s, and the specific value is not limited in this embodiment of the present invention.
And step 402, controlling the pressure value of the air bag to rise at a constant speed based on the rotating speed of the pump.
In the embodiment of the invention, the pressure value of the air bag is controlled to rise at a constant speed by dynamically adjusting the rotating speed of the pump.
In step 403, a pressure value is obtained based on the pressure sensor during the pressurization process.
This step is similar in principle to step 102 in the first embodiment and will not be described in detail here.
And step 404, filtering the pressure value to obtain a pulse wave, and identifying a peak point of the pulse wave.
This step is similar in principle to step 103 in the first embodiment and will not be described in detail here.
And 405, when the current pressure value of the air bag is equal to a first threshold value, starting to judge whether the current pressure value of the air bag is greater than or equal to a pre-judged pressurization value.
This step is similar in principle to step 104 in the first embodiment and will not be described in detail here.
This step is similar in principle to step 105 in the first embodiment and will not be described in detail here.
And step 407, stopping pressurization when the current pressure value of the air bag is greater than or equal to a predetermined pressurization value.
In the embodiment of the invention, when the current pressure value of the air bag is greater than or equal to the pre-judged pressurization value, the pressurization is stopped, the gas in the air bag is directly discharged, and the depressurization process is not needed.
The pre-judged pressurization value can be estimated according to the following three modes, and when the current pressure value of the air bag meets any one of the following three modes, the pressurization is stopped.
Preferably, the step 407 includes:
substep 4071, ceasing pressurization when the current pressure value of the bladder is greater than or equal to 280 mmHg.
And when the current pressure value of the air bag is greater than or equal to 280mmHg, stopping pressurization.
Substep 4072, when the current pressure value of the air bag is greater than or equal to the pressurization value corresponding to the sum of 20mmHg and 1.2 times of the pressure value corresponding to the highest peak point of the pulse wave, stopping pressurization.
And acquiring a pressure value corresponding to the highest peak point of the pulse wave, multiplying the pressure value by 1.2 and adding 20mmHg to obtain a pre-judgment pressurization value, and stopping pressurization when the current pressure value of the air bag is greater than or equal to the pre-judgment pressurization value.
Substep 4073, when the ratio of the peak point corresponding to the two consecutive pulse waves collected after the pulse wave corresponding to the highest peak point is less than 0.5 and less than 0.4, respectively, stopping pressurizing.
And when the ratio of the peak point corresponding to the first pulse wave to the highest peak point is less than 0.5, and the ratio of the peak point corresponding to the second pulse wave to the highest peak point is less than 0.4, determining that the pressurization is carried out to a pre-determined pressurization value, and stopping the pressurization.
And step 408, determining systolic pressure and diastolic pressure based on the peak point of the pulse wave.
This step is similar in principle to step 107 in the first embodiment and will not be described in detail here.
Compared with the prior art, the embodiment of the invention has the following advantages:
in the embodiment of the invention, the rotation speed of a pump is dynamically adjusted based on the variation of the duty ratio of a control chip pin, the pressure value of an air bag is controlled to rise at a constant speed based on the rotation speed of the pump, in the pressurizing process, the pressure value is obtained based on a pressure sensor, the pressure value is filtered to obtain a pulse wave, the peak point of the pulse wave is identified, when the current pressure value of the air bag is equal to a first threshold value, whether the current pressure value of the air bag is greater than or equal to a pre-judgment pressurizing value or not is judged, when the current pressure value of the air bag is less than the pre-judgment pressurizing value, and on the basis of the first threshold value, the rising pressure value of the air bag is equal to N times of a second threshold value, judgment is carried out for the (N + 1) th time, whether the current pressure value of the air bag is greater than or equal to the pre, and stopping pressurization, and determining the systolic pressure and the diastolic pressure based on the peak point of the pulse wave. The blood pressure is measured in the pressurizing process, the time for the upper arm to be stressed and the measuring time are reduced, the error of a measuring result caused by the fact that the blood vessel of a user cannot be timely recovered due to long-time compression is reduced, and the using comfort level and the measuring accuracy of the user are improved; the constant-speed stable pressurization is used in the process of measuring the blood pressure, and the blood pressure is pressurized to a proper pressurization value individually according to the blood pressure of a user, so that the measurement accuracy is improved.
For simplicity of explanation, the method embodiments are described as a series of acts or combinations, but those skilled in the art will appreciate that the embodiments are not limited by the order of acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the embodiments of the invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
EXAMPLE III
Referring to fig. 5, a block diagram of a dynamic blood pressure measuring system according to a third embodiment of the present invention is shown, which may specifically include the following units:
the system comprises: a control chip, a pressure sensor, an air bag and a pump;
the control chip includes:
and a rotation speed adjusting unit 501, configured to dynamically adjust a rotation speed of the pump to control the pressure value of the air bag to rise at a constant speed.
A signal acquiring unit 502 for acquiring a pressure value based on the pressure sensor during the pressurization process.
The signal processing unit 503 is configured to filter the pressure values to obtain pulse waves, and identify peak points of the pulse waves.
A first judging unit 504, configured to start judging whether the current pressure value of the airbag is greater than or equal to a pre-judgment pressurization value when the current pressure value of the airbag is equal to a first threshold value.
A second judging unit 505, configured to, when the current pressure value of the airbag is smaller than the pre-determined pressurization value, and on the basis of the first threshold, when the rising pressure value of the airbag is equal to N times of a second threshold, perform judgment for the (N + 1) th time, and determine whether the current pressure value of the airbag is greater than or equal to the pre-determined pressurization value; and N is an integer greater than or equal to 1.
And the pressurization control unit 506 is used for stopping pressurization when the current pressure value of the air bag is greater than or equal to a pre-judged pressurization value.
A calculating unit 507, configured to determine a systolic pressure and a diastolic pressure based on the peak point of the pulse wave.
Compared with the prior art, the embodiment of the invention has the following advantages:
the embodiment of the invention controls the pressure value of the air bag to rise at a constant speed by dynamically adjusting the rotating speed of the pump, obtains the pressure value based on the pressure sensor in the pressurizing process, filtering the pressure value to obtain a pulse wave, identifying a peak point of the pulse wave, and when the current pressure value of the air bag is equal to a first threshold value, starting to judge whether the current pressure value of the air bag is larger than or equal to a pre-judging pressurization value or not, when the current pressure value of the air bag is smaller than the pre-judging pressurization value, on the basis of the first threshold value, when the rising pressure value of the air bag is equal to N times of the second threshold value, judging for the (N + 1) th time, determining whether the current pressure value of the air bag is greater than or equal to a pre-judgment pressurization value, and when the current pressure value of the air bag is greater than or equal to a pre-judged pressurization value, stopping pressurization, and determining the systolic pressure and the diastolic pressure based on the peak point of the pulse wave. The blood pressure is measured in the pressurizing process, the time for the upper arm to be stressed and the measuring time are reduced, the error of a measuring result caused by the fact that the blood vessel of a user cannot be timely recovered due to long-time compression is reduced, and the using comfort level and the measuring accuracy of the user are improved; the constant-speed stable pressurization is used in the process of measuring the blood pressure, and the blood pressure is pressurized to a proper pressurization value individually according to the blood pressure of a user, so that the measurement accuracy is improved.
Example four
Referring to fig. 6, a block diagram of a dynamic blood pressure measuring system according to a fourth embodiment of the present invention is shown, which may specifically include the following units:
the system comprises: a control chip, a pressure sensor, an air bag and a pump;
the control chip includes:
and the dynamic adjustment unit 601 is configured to dynamically adjust the rotation speed of the pump based on the variation of the duty ratio of the control chip pin.
IP170558
Wherein the change amount of the duty ratio is related to the current pressure value and the current pressurizing speed of the air bag.
And the pressure value control unit 602 is configured to control the pressure value of the air bag to rise at a constant speed based on the rotation speed of the pump.
A signal acquiring unit 603 for acquiring a pressure value based on the pressure sensor during the pressurization process.
The signal processing unit 604 is configured to filter the pressure value to obtain a pulse wave, and identify a peak point of the pulse wave.
A first judging unit 605, configured to start to judge whether the current pressure value of the airbag is greater than or equal to a pre-judgment pressurization value when the current pressure value of the airbag is equal to a first threshold value.
A second judging unit 606, configured to, when the current pressure value of the airbag is smaller than the pre-judged pressurization value and the rising pressure value of the airbag is equal to N times of a second threshold on the basis of the first threshold, perform judgment for the (N + 1) th time, and determine whether the current pressure value of the airbag is greater than or equal to the pre-judged pressurization value; and N is an integer greater than or equal to 1.
And a pressurization control unit 607 for stopping pressurization when the current pressure value of the air bag is greater than or equal to a predetermined pressurization value.
The pressurization control unit 607 includes:
a first pressurization control subunit 6071 configured to stop pressurization when the current pressure value of the air bag is greater than or equal to 280 mmHg.
A second pressurization control subunit 6072, configured to stop pressurization when the current pressure value of the airbag is greater than or equal to a pressurization value corresponding to the sum of 20mmHg and 1.2 times the pressure value corresponding to the highest peak point of the pulse wave.
And a third pressurization control subunit 6073, configured to stop pressurization when the ratio of the peak point corresponding to the second pulse wave to the highest peak point is smaller than 0.5 and 0.4, respectively, for two consecutive pulse waves collected after the pulse wave corresponding to the highest peak point.
A calculating unit 608 for determining a systolic pressure and a diastolic pressure based on the peak point of the pulse wave.
Compared with the prior art, the embodiment of the invention has the following advantages:
in the embodiment of the invention, the rotation speed of a pump is dynamically adjusted based on the variation of the duty ratio of a control chip pin, the pressure value of an air bag is controlled to rise at a constant speed based on the rotation speed of the pump, in the pressurizing process, the pressure value is obtained based on a pressure sensor, the pressure value is filtered to obtain a pulse wave, the peak point of the pulse wave is identified, when the current pressure value of the air bag is equal to a first threshold value, whether the current pressure value of the air bag is greater than or equal to a pre-judgment pressurizing value or not is judged, when the current pressure value of the air bag is less than the pre-judgment pressurizing value, and on the basis of the first threshold value, the rising pressure value of the air bag is equal to N times of a second threshold value, judgment is carried out for the (N + 1) th time, whether the current pressure value of the air bag is greater than or equal to the pre, and stopping pressurization, and determining the systolic pressure and the diastolic pressure based on the peak point of the pulse wave. The blood pressure is measured in the pressurizing process, the time for the upper arm to be stressed and the measuring time are reduced, the error of a measuring result caused by the fact that the blood vessel of a user cannot be timely recovered due to long-time compression is reduced, and the using comfort level and the measuring accuracy of the user are improved; the constant-speed stable pressurization is used in the process of measuring the blood pressure, and the blood pressure is pressurized to a proper pressurization value individually according to the blood pressure of a user, so that the measurement accuracy is improved.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The algorithms and displays presented herein are not inherently related to any particular computer, virtual machine, or other apparatus. Various general purpose systems may also be used with the teachings herein. The required structure for constructing such a system will be apparent from the description above. Moreover, the present invention is not directed to any particular programming language. It is appreciated that a variety of programming languages may be used to implement the teachings of the present invention as described herein, and any descriptions of specific languages are provided above to disclose the best mode of the invention.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in a dynamic blood pressure measuring device according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (4)
1. An ambulatory blood pressure measurement system, comprising: a control chip, a pressure sensor, an air bag and a pump;
the control chip includes:
the rotating speed adjusting unit is used for controlling the pressure value of the air bag to rise at a constant speed by dynamically adjusting the rotating speed of the pump;
the signal acquisition unit is used for acquiring a pressure value based on the pressure sensor in the pressurizing process;
the signal processing unit is used for filtering the pressure value to obtain a pulse wave and identifying a peak point of the pulse wave;
the first judgment unit is used for starting to judge whether the current pressure value of the air bag is greater than or equal to a pre-judgment pressurization value or not when the current pressure value of the air bag is equal to a first threshold value;
the second judgment unit is used for judging for the (N + 1) th time when the current pressure value of the air bag is smaller than the pre-judgment pressurization value and the rising pressure value of the air bag is equal to N times of a second threshold value on the basis of the first threshold value, and determining whether the current pressure value of the air bag is larger than or equal to the pre-judgment pressurization value or not; n is an integer greater than or equal to 1;
the pressurization control unit is used for stopping pressurization when the current pressure value of the air bag is greater than or equal to a pre-judged pressurization value;
and the calculating unit is used for determining the systolic pressure and the diastolic pressure based on the peak point of the pulse wave.
2. The system of claim 1, wherein the rotational speed adjustment unit comprises:
the dynamic adjusting unit is used for dynamically adjusting the rotating speed of the pump based on the variable quantity of the duty ratio of the pin of the control chip;
and the pressure value control unit is used for controlling the pressure value of the air bag to rise at a constant speed based on the rotating speed of the pump.
3. The system of claim 2, wherein the amount of change in the duty cycle is related to a current pressure value of the bladder and a current pressurization speed.
4. The system of claim 1, wherein the pressurization control unit comprises:
and the first pressurization control subunit is used for stopping pressurization when the current pressure value of the air bag is greater than or equal to 280 mmHg.
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| CN107260148A (en) * | 2017-07-12 | 2017-10-20 | 北京卫嘉高科信息技术有限公司 | A kind of blood pressure measuring method, storage device and device |
| CN111317460B (en) * | 2018-12-14 | 2023-01-03 | 深圳迈瑞生物医疗电子股份有限公司 | Air inflation and deflation control method, control system and device for blood pressure measurement |
| WO2020132898A1 (en) * | 2018-12-25 | 2020-07-02 | 深圳市大富网络技术有限公司 | Blood pressure and pulse detection method, device, and system |
| US20220296104A1 (en) * | 2019-04-04 | 2022-09-22 | Beijing Taiya Technology Co., Ltd. | Pulse meter and control method therefor |
| CN110013233A (en) * | 2019-04-04 | 2019-07-16 | 博脉有限公司 | Pulse condition analyser and its control method |
| WO2020223934A1 (en) * | 2019-05-08 | 2020-11-12 | 深圳市长桑技术有限公司 | Sphygmomanometer, sphygmomanometer control method, and method for measuring effective pulse wave |
| CN110115573A (en) * | 2019-05-27 | 2019-08-13 | 威海威高医疗影像科技有限公司 | A kind of blood pressure interval measurement the blowing pressure control method, device and patient monitor |
| CN114533009A (en) * | 2020-11-25 | 2022-05-27 | 华为技术有限公司 | Blood pressure measuring device and pressurizing method thereof |
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