CN102626308B - Blood pressure measurement method resistant to movement interference and system - Google Patents
Blood pressure measurement method resistant to movement interference and system Download PDFInfo
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Abstract
The invention relates to a blood pressure measurement method resistant to movement interference and a system. The method comprises the following steps of performing initializing setting on gas discharging parameters; collecting cuff pressure data; calculating average gas discharging speed and pulse-width modulation (PWM) increasing amount according to the collected pressure date; judging whether a movement mark position is in place; when the movement mark position is not in place, identifying movement interference, and setting a pressure value before movement interference; when the movement mark position is in place, processing the movement interference, and enabling a current pressure value to achieve the pressure value before the movement interference. Calculating a blood pressure value according to the current pressure value and a PWM value, and setting a gas discharging target pressure value according to the blood pressure value; and if the current pressure value is smaller than or equal to the gas discharging target pressure value, completely opening a gas valve to discharge gas, and finishing measurement. The blood pressure measurement method resistant to the movement interference can effectively reduce leakage caused by the movement interference and improves accuracy and effectiveness of blood pressure measurement under the condition of movement interference.
Description
Technical field
The present invention relates to a kind of blood pressure measuring method and system, relate in particular to a kind of blood pressure measuring method and system of anti motion interference.
Background technology
Blood pressure is the life parameters that body weight for humans is wanted.At present, succusion is the non-invasive blood pressure method of measurement automatically generally adopting in monitor.And succusion claims oscillographic method, carry out Measure blood pressure by the relation of setting up systolic pressure, mean pressure, diastolic pressure and cuff pressure pulse wave.Concrete operations are as follows, first cuff are bundled on arm, and cuff is inflated to certain pressure, until pressure higher than systolic pressure, then starts venting; In deflation course, in cuff, static pressure reduces gradually, pressure transducer can detect pressure and the fluctuation in surveyed cuff in real time, in the time that in cuff, static pressure approaches systolic pressure, pressure pulse wave wave amplitude increases, while equaling mean pressure, arterial wall is in removing the state of load, and pressure pulse wave amplitude reaches maximum; Be less than after diastolic pressure at pressure, arterial lumen is fully expanded, and now pressure pulse wave amplitude maintains reduced levels.Can calculate systolic pressure, mean pressure and diastolic pressure according to the pressure curve of pressure pulse wave amplitude.
At present, linear deflation mode is the venting mode that industry is comparatively commonly used; Linear deflation mode is that the valve openings size by controlling linear valve ensures the speed venting with 2 mmHg/s-7mmHg/s, and the cuff pressure pulse wave in detection deflation course and corresponding cuff thereof are pressed.Linear deflation mode can make tester comparatively comfortable, but is easily interfered in measuring, thus the accuracy that impact is measured.In blood pressure measurement process, often there will be measured to bend elbow, large motion and the slight discontinuous little motion etc. such as rock.Use the blood pressure measurement of linear deflation mode, in measuring process, always with the linear deflation of fixed speed, if arm extruding cuff, causes cuff gas leakage when motion, cuff pressure drop is much lower, make pulse wave loss more, and pulse wave transformation of data distortion before and after when motion and motion, cause that effective pressure pulse wave data reduce, and have a strong impact on accuracy and the effectiveness of blood pressure measurement.
Summary of the invention
The technical problem that the present invention solves is: the blood pressure measuring method and the system that build a kind of anti motion interference, overcome in prior art because of motion artifacts, the gas leakage of generation cuff, reduces effective pressure pulse wave data, thereby reduces blood pressure the accuracy of measurement and the technical problem of effectiveness.
Technical scheme of the present invention is: a kind of blood pressure measuring method of anti motion interference, comprise the following steps: venting parameter initialization: venting parameter is initialized to setting, and open air valve and start venting, venting parameter initialization setting comprises initial p WM value and kinestate flag bit is set; ; Gather cuff pressure data: cuff pressure data are gathered, and pressure data is carried out to denoising and signal processing and amplifying; Calculate venting speed and PWM recruitment: calculate average venting speed and PWM recruitment according to the pressure data gathering; Judge kinestate flag bit: judge that whether kinestate flag bit is in place; Motion artifacts identification: in the time judging that motion flag bit is not in place, motion artifacts is identified, while identifying motion artifacts, obtain the front force value of motion artifacts and PWM value, and motion flag bit is set in place; Motion artifacts processing: in the time judging that motion flag bit is in place, motion artifacts is processed, make current pressure value reach the front force value of motion artifacts, and motion flag bit is set to not in place; Venting target pressure value is arranged: according to current force value and PWM value, pressure value is calculated, and according to this pressure value, venting target pressure value is arranged; Judge whether to reach venting target pressure value: current force value and venting target pressure value are compared, judge whether current pressure value reaches venting target pressure value; If when current force value is greater than venting target pressure value, is back to and gathers cuff pressure data step; Air valve is opened venting completely: if when current force value is less than or equal to venting target pressure value, air valve is completely opened and exitted.
Further technical scheme of the present invention is: described motion artifacts identification step comprises: according to the cuff pressure data that gather, obtain current pressure value, and current pressure value is carried out to record, corresponding current pressure value PWM value is carried out to record simultaneously; When PWM value increases continuously, and when the recruitment of accumulation exceedes PWM threshold value at short notice, or in the time that the absolute value of the average venting speed calculating is greater than certain number of times of threshold value of default real-time venting speed, or in the time that current PWM value is greater than the certain number of times of threshold value of default PWM value, judgement identifies motion artifacts; In the time identifying motion artifacts, force value before motion artifacts and PWM value are arranged, kinestate flag bit is set in place.
Further technical scheme of the present invention is: described motion artifacts treatment step comprises: in the time that judgement exists motion artifacts, the motion artifacts time is carried out to timing, and the time that judges motion artifacts whether reach motion artifacts time threshold, judge whether current force value reaches the force value before motion artifacts simultaneously; In the time that a period of time internal pressure value stabilization is in a certain force value threshold range, judge that motion artifacts finishes; When motion artifacts finishes, and in the time that current force value is less than the force value before motion artifacts, judgement need to supplement gas to cuff; In the time that needs supplement gas, open air-pump inflating, make force value reach the front force value of motion artifacts, and venting parameter is re-started and initializes setting, motion flag bit is set to not in place, and initial venting again.
Further technical scheme of the present invention is: before described venting target pressure value is arranged, also comprise PWM value setting steps: when judge unidentified go out when motion artifacts, PWM value is set, wherein PWM value be set to current PWM value and PWM recruitment and; In the time that judgement does not need to supplement gas, or after venting parameter is reinitialized, the PWM value that PWM value is set to reinitialize; When obtaining before motion artifacts after force value and PWM value, or before judgement does not reach motion artifacts time threshold and motion artifacts when force value, or when judge that motion artifacts does not finish, PWM value is set to zero, and close gas check valve, stop exitting.
Technical scheme of the present invention is: build a kind of blood pressure measuring system of anti motion interference, comprise parameter presetting module, pressure data acquisition module, PWM recruitment computing module, kinestate flag bit on-site judgment module, motion artifacts identification module, motion artifacts processing module, pressure value computing module, venting target pressure value judge module and measure and finish judge module; Described parameter presetting module, for initializing setting to venting parameter; Described pressure data acquisition module, is connected with described parameter presetting module, for gathering pressure data; Described PWM recruitment computing module, is connected with described pressure data acquisition module, for calculating average venting speed and PWM recruitment; Whether described kinestate flag bit judge module, is connected with described PWM recruitment computing module, in place for judging kinestate flag bit; Described motion artifacts identification module, is connected with described kinestate flag bit judge module, in the time judging that motion flag bit is not in place, motion artifacts is identified, and force value before motion artifacts and PWM value are arranged; Described motion artifacts processing module, is connected with described kinestate flag bit judge module, in the time judging that motion flag bit is in place, motion artifacts is processed, and makes current pressure value reach the front force value of motion artifacts; Described pressure value computing module is connected with described motion artifacts identification module and motion artifacts processing module respectively, for pressure value is calculated, then according to the pressure value calculating, venting target pressure value is arranged; Described venting target pressure value judge module is connected with described pressure value computing module, for current pressure value and venting target pressure value are compared, judges whether current pressure value reaches the venting target pressure value of setting; Described measurement finishes judge module, is connected, if while being less than or equal to venting target pressure value for current force value, air valve completely being opened and exitted with described venting target pressure value judge module.
Further technical scheme of the present invention is: described motion artifacts identification module comprises force value and PWM value record unit, motion artifacts identification judging unit and force value and PWM value setting unit; Described force value and PWM value record unit are connected with described kinestate flag bit on-site judgment module, for current pressure value and PWM value are carried out to record; Described motion artifacts identification judging unit is connected with described force value and PWM value record unit, for judging whether to identify motion artifacts; Described force value and PWM value setting unit are connected with described motion artifacts identification judging unit, in the time that judgement identifies motion artifacts, obtain the front force value of motion artifacts and PWM value, and motion flag bit is set in place.
Further technical scheme of the present invention is: described motion artifacts processing module comprises time threshold and pressure threshold judging unit, motion end judging unit, make-up gas judging unit and initializes setting unit; Described time threshold and pressure threshold judging unit are connected with described kinestate flag bit on-site judgment module, for the motion artifacts time is carried out to timing, and the time that judges motion artifacts whether reach motion artifacts time threshold, and judge whether current force value reaches the force value before motion artifacts; Described motion finishes judging unit and is connected with described time threshold and pressure threshold judging unit, be used in the time judging that the time of motion artifacts reaches motion artifacts time threshold and judge when current force value reaches the force value before motion artifacts, judging whether motion artifacts finishes; Described make-up gas judging unit finishes judging unit with described motion and is connected, and in the time judging that motion artifacts finishes, judging whether need to be to cuff make-up gas; Described initialization setting unit is connected with described make-up gas judging unit, in the time that judgement need to be inflated cuff, open air pump and inflate, and venting parameter is re-started and initializes setting, and motion flag bit is set to not in place.
Further technical scheme of the present invention is: also comprise that PWM value arranges module, be connected respectively, for PWM value being arranged according to motion artifacts with described motion artifacts identification module and described motion artifacts processing module.
Technical scheme of the present invention is: build a kind of blood pressure measuring system, comprise cuff gas path module, data acquisition module, control unit, central processing module and display module; Described cuff gas path module is for carrying out inflation/deflation to cuff; Described data acquisition module is connected with described cuff gas path module, for gathering cuff pressure data, then cuff pressure data is carried out to filtering and amplification; Described control unit is connected with institute cuff gas path module, cuff is inflated and is controlled vent valve and exit for controlling inflator pump; Described central processing module is connected with described control unit and data acquisition unit respectively, for according to the cuff pressure data that collect, pressure value being calculated, and the blood pressure measuring system of a kind of anti motion interference as above is arranged in described central processing module; Described display module is connected with described central processing module, for the pressure value calculating is shown.
Technique effect of the present invention is: the blood pressure measuring method and the system that build a kind of anti motion interference, by motion artifacts is analyzed, the cuff collecting during according to motion artifacts is pressed and cuff is pressed the feature changing, after the identification of design motion artifacts and identification motion artifacts, inflator pump and vent valve are carried out to the corresponding processing of controlling, can effectively reduce the gas leakage causing because of motion artifacts, thereby effectively increase the accuracy and the precision that gather, improve accuracy and the effectiveness of the blood pressure measurement in motion artifacts situation simultaneously.
Brief description of the drawings
Fig. 1 is the blood pressure measuring method flow chart of a kind of anti motion interference of the present invention.
Fig. 2 is the blood pressure measuring system schematic diagram of a kind of anti motion interference of the present invention.
Fig. 3 is the concrete schematic diagram of the blood pressure measuring system of a kind of anti motion interference of the present invention.
The variation schematic diagram of cuff pressure when Fig. 4 is the normal Measure blood pressure of blood pressure measuring system of a kind of anti motion interference of the present invention.
Another schematic diagram of variation of cuff pressure when Fig. 5 is the normal Measure blood pressure of blood pressure measuring system of a kind of anti motion interference of the present invention.
The force value curvilinear motion schematic diagram in the time carrying out occurring motion artifacts in deflation course of the blood pressure measuring system of Fig. 6 a kind of anti motion interference of the present invention.
Another schematic diagram of force value curvilinear motion in the time carrying out occurring motion artifacts in deflation course of the blood pressure measuring system of Fig. 7 a kind of anti motion interference of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, technical solution of the present invention is further illustrated.
As shown in Figure 1, the specific embodiment of the present invention is: a kind of blood pressure measuring method of anti motion interference is provided, comprises the steps:
Detailed process is: venting parameter is initialized to setting, and open air valve; Comprising initial PWM value, venting target pressure value, venting target speed value, kinestate flag bit and other every threshold values (comprising threshold value and the motion artifacts time threshold of real-time venting speed) etc. are set.Wherein the present invention mainly the parameters of the blood pressure measuring method to linear deflation mode initialize setting; And in linear deflation process, the opening of air valve is the process increasing gradually along with the increase of time; Wherein the size of the valve openings of linear valve is controlled by regulating impulse adjustment width (being called for short PWM), the span of PWM value is 0 ~ 100,0 ~ 100%, the size of PWM value is directly proportional to valve openings, carry out the openings of sizes of by-pass valve control by PWM value is set, thereby reach linear deflation; Therefore the size of the percentage ratio of air valve opening is the size of PWM value.
Detailed process is: by pressure transducer, cuff pressure data are gathered, remove noise through low-pass filtering treatment, and the signal of removing noise is amplified, then the signal after amplifying being delivered to central processing module processes, the interval that wherein gathers cuff pressure is T, and sample frequency is 1/T.And the cuff pressure data that gather are current force value.
Detailed process is: according to the speed of can on average being exitted of the pressure differential in a period of time, unit is mmHg/s, and this speed of on average exitting, using the speed as real-time venting, is wherein current pressure value, is the force value before a period of time; Concrete formula is as follows:
In the time that needs regulate PWM value, need to first calculate PWM recruitment, unit is 1, span is wherein 0 ~ 100.
Poor according to current real-time venting speed and real-time venting speed before and target velocity (fixed value), the then recruitment of the PWM value before basis, calculates the recruitment of this cycle P WM value; Wherein, calculate the method for PWM recruitment, be not limited to as above method, can also calculate according to the characteristic mode of air valve, also can adopt open loop by-pass valve control opening and design the account form of PWM recruitment, according to reality venting speed and the poor recruitment of determining PWM value of target velocity.
Detailed process is: described kinestate flag bit comprise kinestate flag bit in place with two kinds not in place of kinestate flag bit; According to the kinestate flag bit arranging, judge that whether kinestate flag bit is in place; In the time judging that kinestate flag bit is not in place, need motion artifacts to identify; In the time judging that kinestate flag bit is in place, illustrate and have motion artifacts, need motion artifacts to process.
Detailed process is: in the time judging that kinestate flag bit is not in place, need to identify motion artifacts; , according to the cuff pressure data that gather, obtain current pressure value; Current pressure value is carried out to record, corresponding current pressure value current PWM value is carried out to record, doing is like this in order to identify motion simultaneously, and when identifying motion, and after motion finishes, can make force value and PWM value return to the PWM value of force value before motion and correspondence thereof; Under normal circumstances, can only record force value and the PWM value of interior M period for the previous period.
Detailed process is: judge whether to identify motion artifacts and comprise following mode: when PWM value increases continuously, and the recruitment of accumulation is at short notice while exceeding PWM threshold value, can judge and identify motion artifacts; Or in the time that the absolute value of the real-time venting speed calculating is greater than certain number of times of threshold value of default real-time venting speed, can judges and identify motion artifacts; Or in the time that current PWM value is greater than the certain number of times of threshold value of default PWM value, can judges and identify motion artifacts.Wherein, motion artifacts refer to up and down or roll arm, bend elbow motion and the motion such as acutely rock; In the time that motion artifacts occurs, can be expressed to cuff, cuff pressure is raise rapidly, cause gas leakage, affect linear deflation control and blood pressure measurement.The threshold value of the speed of wherein exitting in real time and the threshold value of PWM value can be determined according to the maximum intensity of detectable pulse wave signal; The identification of motion artifacts is the sudden change in order PWM value to be detected timely, thereby closes gas check valve, reduces gas leakage.
Detailed process is: the force value to M the period in a period of time of record in step 105 is searched for, find out the period that pressure is undergone mutation, if find this sudden change period, the force value of this sudden change period is set to the force value before motion artifacts, and PWM value corresponding to this force value is set to the PWM value before motion artifacts.If do not find the period of undergoing mutation, the force value of first period in the M of the record period is set to the force value before motion artifacts, and PWM value corresponding to this force value is set to the PWM value before motion artifacts; And motion flag bit is set in place.
Detailed process is: when judging that kinestate is masked as time in place, there is motion artifacts in judgement, need motion artifacts to process, now need the motion artifacts time to carry out timing, whether the time that then judges motion artifacts reaches motion artifacts time threshold, needs to judge whether current force value reaches the force value before motion artifacts simultaneously.
Detailed process is: in the time judging that the time of motion artifacts reaches motion artifacts time threshold, judge when current force value reaches the force value before motion artifacts, account for motion is disturbed and still carried out, and now needs to judge whether motion artifacts finishes simultaneously; If a period of time internal pressure value stabilization, in a certain force value threshold range, judges that motion artifacts finishes.
Detailed process is: in the time judging that motion artifacts has finished, also need to judge whether to inflate cuff make-up gas; The force value whether being less than before motion artifacts according to current force value judges whether to supplement gas, and in the time that current force value is less than the force value before motion artifacts, judgement need to supplement gas to cuff; Otherwise judgement does not need to supplement gas.
Detailed process is: in the time that judgement need to supplement gas, open air pump and inflate, make force value reach the front force value of motion artifacts; Then reinitialize venting parameter, comprise PWM value and other parameters are initialized to setting; Motion flag bit is set to not in place, and initial venting again.
Detailed process is: when judge unidentified go out when motion artifacts, PWM value is set, wherein PWM value be set to current PWM value and PWM recruitment and; In the time that judgement does not need to supplement gas, or after venting parameter is reinitialized, the PWM value that PWM value is set to reinitialize; When obtaining before motion artifacts after force value and PWM value, or before judgement does not reach motion artifacts time threshold and motion artifacts when force value, or when judge that motion artifacts does not finish, PWM value is set to zero, and close gas check valve, stop exitting; After by PWM value, setting completed, waiting time T, then enters next step.
Detailed process is: according to the current pressure value of the PWM value arranging and collection, pressure value is calculated; By pressure data filtering is extracted to pulse wave amplitude, obtain, after the pressure curve of pulse wave amplitude and correspondence thereof, calculating pressure value.According to the pressure value calculating, venting goal pressure is arranged; Wherein according to the scope of diastolic pressure, a lower force value is set in initial venting target pressure value, is then calculating after pressure value, according to the pressure value calculating Offered target force value again.
Detailed process is: by current force value and venting target pressure value are compared, judge whether to reach venting target pressure value; If current force value is greater than venting target pressure value, need repetition above-mentioned steps, repeating step 102 is to step 113, until current pressure value is less than or equal to target blow off pressure value.
Detailed process is: if current force value is less than or equal to venting target pressure value, measures and finish, make air valve completely open and exit.
Wherein, in step 101 to kinestate flag bit arrange be preferably set to not in place, in follow-up step 108 or 111, can or process the initial setting up that changes this flag bit according to the identification of motion artifacts, if in the time that force value current in step 114 is greater than venting target pressure value, when returning to step 102 and again operating, step 104 will to change after flag bit state judge, when finish this measure after, flag bit will recover initial setting up state.
As shown in Figure 2, the specific embodiment of the present invention is: build a kind of blood pressure measuring system of anti motion interference, comprise cuff gas path module 201, data acquisition module 202, control unit 203, central processing module 204 and display module 205;
Described cuff gas path module 201 is for inflating cuff;
Described data acquisition module 202 is connected with described cuff gas path module 201, for gathering cuff pressure data, then cuff pressure data is carried out to filtering and amplification;
Described control unit 203 is connected with institute cuff gas path module 201, cuff is inflated and is controlled vent valve and exit for controlling inflator pump;
Described central processing module 204 is connected with described control unit 203 and data acquisition unit 202 respectively, for according to the cuff pressure data that collect, pressure value being calculated, and the pressure value of calculating is transferred to display module 205 shows;
Described display module 205 is connected with described central processing module 204, for the pressure value calculating is shown;
Wherein said control unit 203 comprises vent valve control unit 2031 and inflator pump control unit 2032; Described inflator pump control unit 2032 is for cuff is carried out to ventilating control, and described vent valve control unit 2031 is for control that cuff is exitted.
Wherein said central processing module 204 comprises that parameter presetting module 301, pressure data acquisition module 302, PWM recruitment computing module 303, kinestate flag bit on-site judgment module 304, motion artifacts identification module 305, motion artifacts processing module 306, PWM value arrange module 307, pressure value computing module 308, venting target pressure value judge module 309 and measure and finish module 310;
Described parameter presetting module 301, for venting parameter is initialized to setting, arrange comprising the PWM value to initial, venting target pressure value, venting target speed value and other every threshold values (comprising threshold value and the motion artifacts time threshold of real-time venting speed);
Described pressure data acquisition module 302 is connected with described parameter presetting module 301 and data acquisition module 202, for gathering the pressure data being sent by data acquisition module 202;
Described PWM recruitment computing module 303, is connected with described pressure data acquisition module 302, for calculating average venting speed and PWM recruitment;
Whether described kinestate flag bit judge module 304 is connected with described PWM recruitment computing module 303, in place for judging kinestate flag bit;
Described motion artifacts identification module 305 is connected with described kinestate flag bit judge module 304, for in the time that described kinestate flag bit judge module 304 judges that motion flag bit is not in place, motion artifacts is identified, and in the time identifying motion artifacts, determine the front force value of motion artifacts and PWM value, then force value before motion artifacts and PWM value are arranged;
Described motion artifacts processing module 306 is connected with described kinestate flag bit judge module 304, in the time that described kinestate flag bit judge module 304 judges that motion flag bit is in place, motion artifacts is processed; Now there is motion artifacts in the explanation in place of kinestate flag bit, so will process motion artifacts;
Described PWM value arranges module 307, is connected respectively, for PWM value being arranged according to motion artifacts with described motion artifacts identification module 305 and described motion artifacts processing module 306; When judge unidentified go out when motion artifacts, PWM value is set, wherein PWM value be set to current PWM value and PWM recruitment and; In the time that judgement does not need to supplement gas, or after venting parameter is reinitialized, the PWM value that PWM value is set to reinitialize; When obtaining before motion artifacts after force value and PWM value, or before judgement does not reach motion artifacts time threshold and motion artifacts when force value, or in the time judging that motion artifacts does not finish, PWM value is set to zero;
Described pressure value computing module 308 arranges module 307 with described PWM value and is connected, and for calculating blood pressure value, then according to the pressure value obtaining, venting target pressure value is arranged;
Described venting target pressure value judge module 309 is connected with described pressure value computing module 308 and pressure data acquisition module 302 respectively, for current pressure value and venting target pressure value are compared, judge whether current pressure value reaches the venting target pressure value of setting, if judge when current force value is greater than venting target pressure value, be back to pressure data acquisition module, again pressure data gathered;
Described measurement finishes module 310 and is connected with described venting target pressure value judge module 309, in the time judging that current force value is less than or equal to venting target pressure value, air valve is completely opened cuff is exitted.
Wherein said motion artifacts identification module 305 comprises force value and PWM value record unit 3051, motion artifacts identification judging unit 3052 and force value and PWM value setting unit 3053; Described force value and PWM value record unit 3051 are connected with described kinestate flag bit on-site judgment module 304, for current pressure value is carried out to record, corresponding current pressure value current PWM value are carried out to record simultaneously; Described motion artifacts identification judging unit 3052 is connected with described force value and PWM value record unit 3051, for judging whether to identify motion artifacts; Wherein judge whether to identify motion artifacts and comprise following mode: in the time that PWM value increases continuously, and at short notice accumulation recruitment exceed PWM threshold value, can judge and identify motion artifacts; Or in the time that the absolute value of the real-time venting speed calculating is greater than certain number of times of threshold value of default real-time venting speed, can judges and identify motion artifacts; Or when current PWM value is greater than the certain number of times of threshold value of default PWM value, can judges and identify motion artifacts; Described force value and PWM value setting unit 3053 are connected with described motion artifacts identification judging unit 3052, for in the time that judgement identifies motion artifacts, determine the front force value of motion artifacts and PWM value, then force value before motion artifacts and PWM value are arranged, and motion flag bit be set in place, and close gas check valve stop venting.
Described motion artifacts processing module 306 comprises time threshold and pressure threshold judging unit 3061, motion end judging unit 3062, make-up gas judging unit 3063 and initializes setting unit 3064; Described time threshold and pressure threshold judging unit 3061 are connected with described kinestate flag bit on-site judgment module 304, for the motion artifacts time is carried out to timing, and the time that judges motion artifacts whether reach motion artifacts time threshold, judge whether current force value reaches the force value before motion artifacts simultaneously; Described motion finishes judging unit 3062 and is connected with described time threshold and pressure threshold judging unit 3061, be used in the time judging that the time of motion artifacts reaches motion artifacts time threshold and judge when current force value reaches the force value before motion artifacts, judging whether motion artifacts finishes; Described make-up gas judging unit 3063 finishes judging unit 3062 with described motion and is connected, and in the time judging that motion artifacts finishes, judging whether need to be to cuff make-up gas; Described initialization setting unit 3064 is connected with described make-up gas judging unit 3063, for in the time that judgement need to be inflated cuff, open air pump and inflate, then reinitialize venting parameter is set, comprise PWM value and other parameters are initialized to setting; And motion flag bit is set to not in place.
As described in Fig. 4 and Fig. 5, be under normal circumstances, when Measure blood pressure, the variation that cuff pressure produces; Wherein the pulse wave signal in Fig. 4 a little less than, the pulse wave signal in Fig. 5 is stronger; And cuff pressure is slowly to diminish along with the time, produce linear variation.
As shown in Figures 6 and 7, the situation of change of cuff pressure in the time producing motion artifacts; Can find out, carrying out in deflation course, there is motion artifacts three times in Fig. 6, and wherein a motion artifacts is comparatively slight, and force value fluctuation changes and be little, and other twice motion artifacts is comparatively serious, therefore force value fluctuation changes larger; And motion artifacts in Fig. 7 is better than the motion artifacts in Fig. 6,, in deflation course, comparatively violent motion artifacts has occurred three times; Regardless of being stronger motion artifacts or weak motion artifacts, identifying after motion at every turn, all air valve to be closed, then mend and be inflated to the front force value of motion, after supplementary gas is complete, re-start again linear deflation.
The blood pressure measuring method of a kind of anti motion interference provided by the present invention and system are by analyzing motion artifacts, the cuff collecting during according to motion artifacts is pressed and cuff is pressed the feature changing, after the identification of design motion artifacts and identification motion artifacts, inflator pump and vent valve are carried out to the corresponding processing of controlling, can effectively reduce the gas leakage causing because of motion artifacts, thereby effectively increase the accuracy and the precision that gather, improve accuracy and the effectiveness of the blood pressure measurement in motion artifacts situation simultaneously.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (7)
1. a blood pressure measuring method for anti motion interference, is characterized in that, comprises the following steps:
Venting parameter initialization: venting parameter is initialized to settings, and open air valve and start to exit, the parameter initialization setting of exitting comprises initial p WM value and kinestate flag bit are set;
Gather cuff pressure data: cuff pressure data are gathered, and pressure data is carried out to denoising and signal processing and amplifying;
Calculate venting speed and PWM recruitment: calculate average venting speed and PWM recruitment according to the pressure data gathering;
Judge kinestate flag bit state: judge that whether kinestate flag bit is in place;
Motion artifacts identification: in the time judging that motion flag bit is not in place, motion artifacts is identified, while identifying motion artifacts, obtain the front force value of motion artifacts and PWM value, and motion flag bit is set in place;
Motion artifacts processing: in the time judging that motion flag bit is in place, motion artifacts is processed, make current pressure value reach the front force value of motion artifacts, and motion flag bit is set to not in place;
Venting target pressure value is arranged: according to current force value, pressure value is calculated, and according to this pressure value, venting target pressure value is arranged;
Judge whether to reach venting target pressure value: current force value and venting target pressure value are compared, judge whether current pressure value reaches venting target pressure value; If when current force value is greater than venting target pressure value, is back to and gathers cuff pressure data step;
Air valve is opened venting completely: if when current force value is less than or equal to venting target pressure value, air valve is completely opened and exitted;
Described motion artifacts treatment step comprises:
Judge whether to reach the front force value of motion artifacts time threshold and motion artifacts: in the time that judgement exists motion artifacts, the motion artifacts time is carried out to timing, and the time that judges motion artifacts whether reach motion artifacts time threshold, judge whether current force value reaches the force value before motion artifacts simultaneously;
Judge whether motion artifacts finishes: in the time that a period of time internal pressure value stabilization is in a certain force value threshold range, judge that motion artifacts finishes;
Judge whether to supplement gas: when motion artifacts finishes, and in the time that current force value is less than the force value before motion artifacts, judgement need to supplement gas to cuff;
Benefit is inflated to the front force value of motion artifacts: in the time that needs supplement gas, open air-pump inflating, make force value reach the front force value of motion artifacts, and venting parameter is re-started and initializes setting, motion flag bit is set to not in place, and initial is exitted again.
2. a kind of blood pressure measuring method of anti motion interference according to claim 1, is characterized in that, described motion artifacts identification step comprises:
Record current pressure value and PWM value: according to the cuff pressure data that gather, obtain current pressure value, and current pressure value is carried out to record, corresponding current pressure value PWM value is carried out to record simultaneously;
Judge whether to identify motion artifacts: when PWM value increases continuously, and when the recruitment of accumulation exceedes PWM threshold value at short notice, or in the time that the absolute value of the average venting speed calculating is greater than certain number of times of threshold value of default real-time venting speed, or in the time that current PWM value is greater than the certain number of times of threshold value of default PWM value, judgement identifies motion artifacts;
The front force value of motion artifacts and PWM value are set: in the time identifying motion artifacts, force value before motion artifacts and PWM value are obtained, kinestate flag bit is set in place.
3. according to the blood pressure measuring method of a kind of anti motion interference described in claim 1 to 2 any one, it is characterized in that, before described venting target pressure value is arranged, also comprise PWM value setting steps: when judge unidentified go out when motion artifacts, PWM value is set, wherein PWM value be set to current PWM value and PWM recruitment and; In the time that judgement does not need to supplement gas, or after venting parameter is reinitialized, the PWM value that PWM value is set to reinitialize; When obtaining before motion artifacts after force value and PWM value, or before judgement does not reach motion artifacts time threshold and motion artifacts when force value, or when judge that motion artifacts does not finish, PWM value is set to zero, and close gas check valve, stop exitting.
4. the blood pressure measuring system of an anti motion interference, it is characterized in that, comprise parameter presetting module, pressure data acquisition module, PWM recruitment computing module, kinestate flag bit on-site judgment module, motion artifacts identification module, motion artifacts processing module, pressure value computing module, venting target pressure value judge module and measure and finish judge module;
Described parameter presetting module, for initializing setting to venting parameter;
Described pressure data acquisition module, is connected with described parameter presetting module, for gathering pressure data;
Described PWM recruitment computing module, is connected with described pressure data acquisition module, for calculating average venting speed and PWM recruitment;
Whether described kinestate flag bit judge module, is connected with described PWM recruitment computing module, in place for judging kinestate flag bit;
Described motion artifacts identification module, is connected with described kinestate flag bit judge module, in the time judging that motion flag bit is not in place, motion artifacts is identified, and force value before motion artifacts and PWM value are arranged;
Described motion artifacts processing module, is connected with described kinestate flag bit judge module, in the time judging that motion flag bit is in place, motion artifacts is processed, and makes current pressure value reach the front force value of motion artifacts;
Described pressure value computing module is connected with described motion artifacts identification module and motion artifacts processing module respectively, for pressure value is calculated, then according to the pressure value calculating, venting target pressure value is arranged;
Described venting target pressure value judge module is connected with described pressure value computing module, for current pressure value and venting target pressure value are compared, judges whether current pressure value reaches the venting target pressure value of setting;
Described measurement finishes module, is connected with described venting target pressure value judge module, in the time judging that current force value is less than or equal to venting target pressure value, air valve is completely opened and is exitted;
Described motion artifacts processing module comprises time threshold and pressure threshold judging unit, motion end judging unit, make-up gas judging unit and initializes setting unit; Described time threshold and pressure threshold judging unit are connected with described kinestate flag bit on-site judgment module, for the motion artifacts time is carried out to timing, and the time that judges motion artifacts whether reach motion artifacts time threshold, and judge whether current force value reaches the force value before motion artifacts; Described motion finishes judging unit and is connected with described time threshold and pressure threshold judging unit, be used in the time judging that the time of motion artifacts reaches motion artifacts time threshold and judge when current force value reaches the force value before motion artifacts, judging whether motion artifacts finishes; Described make-up gas judging unit finishes judging unit with described motion and is connected, and in the time judging that motion artifacts finishes, judging whether need to be to cuff make-up gas; Described initialization setting unit is connected with described make-up gas judging unit, in the time that judgement need to be inflated cuff, open air pump and inflate, and venting parameter is re-started and initializes setting, and motion flag bit is set to not in place.
5. the blood pressure measuring system of a kind of anti motion interference according to claim 4, is characterized in that, described motion artifacts identification module comprises force value and PWM value record unit, motion artifacts identification judging unit and force value and PWM value setting unit; Described force value and PWM value record unit are connected with described kinestate flag bit on-site judgment module, for current pressure value and PWM value are carried out to record; Described motion artifacts identification judging unit is connected with described force value and PWM value record unit, for judging whether to identify motion artifacts; Described force value and PWM value setting unit are connected with described motion artifacts identification judging unit, in the time that judgement identifies motion artifacts, obtain the front force value of motion artifacts and PWM value, and motion flag bit is set in place.
6. the blood pressure measuring system of a kind of anti motion interference according to claim 5, it is characterized in that, also comprise that PWM value arranges module, be connected with described motion artifacts identification module and described motion artifacts processing module respectively, for PWM value being arranged according to motion artifacts.
7. a blood pressure measuring device, is characterized in that, comprises cuff gas path module, data acquisition module, control unit, central processing module and display module; Described cuff gas path module is for carrying out inflation/deflation to cuff; Described data acquisition module is connected with described cuff gas path module, for gathering cuff pressure data, then cuff pressure data is carried out to filtering and amplification; Described control unit is connected with institute cuff gas path module, cuff is inflated and is controlled vent valve and exit for controlling inflator pump; Described central processing module is connected with described control unit and data acquisition unit respectively, for according to the cuff pressure data that collect, pressure value being calculated, and the blood pressure measuring system of a kind of anti motion interference as described in claim 4 to 6 any one claim be arranged at as described in central processing module; Described display module is connected with described central processing module, for the pressure value calculating is shown.
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| CN109394194A (en) * | 2016-10-25 | 2019-03-01 | 深圳市柯林健康医疗有限公司 | A kind of blood pressure measuring method and system of staircase method anti motion interference |
| CN112135559A (en) * | 2018-05-30 | 2020-12-25 | 深圳迈瑞生物医疗电子股份有限公司 | Optimization method for blood pressure measurement and blood pressure measurement device |
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| JPH0634781B2 (en) * | 1990-10-24 | 1994-05-11 | オムロン株式会社 | Electronic blood pressure monitor |
| JP3232888B2 (en) * | 1994-07-15 | 2001-11-26 | オムロン株式会社 | Decompression control device and electronic sphygmomanometer |
| JP3818853B2 (en) * | 2001-01-17 | 2006-09-06 | テルモ株式会社 | Electronic blood pressure monitor |
| CN1394546A (en) * | 2002-08-08 | 2003-02-05 | 天津市先石光学技术有限公司 | Blood pressure measuring device and method |
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