CN102973257B - Control target value automatic detection device based on blood pressure beat-to-beat detection device and detection method of control target value automatic detection device - Google Patents

Abstract

The invention relates to a control target value automatic detection device and a detection method based on a blood pressure beat-by-beat detection device, which belong to the field of radial artery blood pressure continuous detection. The present invention solves the problem that the existing blood pressure detection device cannot detect the servo control target value at any time, the change of the control target value caused by the change of vascular tension or the offset of the cuff position, etc., cannot continuously and accurately detect the blood pressure, and the determination of a new target value needs to be interrupted The operation of the system caused the problem of missing important monitoring data. The present invention also includes a wavelet filter amplification module, a control target value I ₀ calculation module, and a high-frequency pressure wavelet generation module. When the control target value needs to be detected, the pressure output and the average blood pressure signal output switch of the calculation module are turned on, and the high-frequency pressure wavelet generation module generates A high-frequency pressure wave centered on the average blood pressure value; the current control target value I ₀ is obtained through the control target value I ₀ calculation module, compared with the real-time detected PGdc to adjust the cuff pressure, and obtain the pressure waveform and blood pressure value at this time. Used in the field of blood pressure detection.

Description

Automatic detection device for control target value based on blood pressure beat-by-beat detection device

technical field

The invention belongs to the field of radial artery blood pressure continuous detection. the

Background technique

Cardiovascular and cerebrovascular diseases with hypertension, arteriosclerosis, and stroke as the main symptoms seriously endanger the health of our people. The death due to cardiovascular and cerebrovascular diseases has accounted for the first cause of death among Chinese residents, about 35% to 40%. become an important public health problem in our country. However, there are still many unknown parts of the pathogenesis of hypertension, which is the cause of various cardiovascular and cerebrovascular diseases, because blood pressure changes dynamically at every moment and every heart beat. To find out the cause and pathogenesis of hypertension, it is necessary to increase blood pressure detection and obtain more data on blood pressure changes. Although the currently used intermittent detection sphygmomanometer has become an indispensable means for people's daily blood pressure detection, due to the problem of the detection principle of this type of sphygmomanometer itself and the limitation of the psychological spirit of the measured object, the detection interval needs to be 15 to 30 minutes. minute. In this way, the data measured in one day is only less than 0.05-0.1% of the total blood pressure data. Therefore, long-term and continuous monitoring of blood pressure is very urgent and urgently needed in both basic medical research and clinical diagnosis and treatment. the

Because the blood vessel wall itself has strong nonlinear mechanical properties, the smaller the pressure difference inside and outside the blood vessel wall, the softer the blood vessel wall and the greater the deformation. Therefore, when the average pressure inside the blood vessel is equal to the pressure of the externally pressurized cuff, the The deformation is the largest, and the vessel wall at this time is called unloaded state. In this way, when the cuff pressure of the detection device gradually increases, although the average value PGdc of the photocapacitance volume in the radial artery decreases gradually, the amplitude of the AC part PGac of the photocapacitance volume in the radial artery presents a form from small to large and then from large to small . When the cuff pressure Pc1 corresponding to the maximum value of PGac amplitude is the mean pressure MBP in the radial artery, the corresponding PGdc value is the photoelectric volume value of the artery in an unloaded state, and this value is set as the servo control target value I ₀ . At present, the more mature blood pressure continuous measurement device adopts the volume compensation method, but the problem existing in the continuous measurement of blood pressure by the volume compensation method is that when the blood vessel tension changes or the position of the cuff shifts, etc. When the change of the control target value is caused, it is currently impossible to realize the automatic detection, tracking and adjustment of the servo control target value according to the condition of the blood vessel, which will affect the accuracy of blood pressure detection. For this reason, when it is necessary to detect and adjust the blood pressure control target value, regardless of whether the target value changes or produces errors, the detection can only be interrupted, and the volume vibration method is used to re-determine the target value, and then the continuous detection device is started. Generally, it needs to be interrupted for more than one minute. time. In this way, very important monitoring data will be missed if the blood pressure changes sharply.

Contents of the invention

In order to solve the problem that the existing blood pressure detection device cannot detect the servo control target value at any time, when the control target value changes due to changes in vascular tension or cuff position deviation, etc., the blood pressure cannot be continuously and accurately detected, and a new target value can be determined. The operation of the system needs to be interrupted, resulting in the loss of important blood pressure monitoring data. An automatic detection device and detection method for the control target value based on the blood pressure detection device are proposed. the

The control target value automatic detection device based on the blood pressure beat-by-beat detection device of the present invention includes a cuff and a sensing device module, a photoelectric volume detection module, a comparator, a compensation circuit and a cuff pressure control module; the cuff Connect the photoelectric signal input end of the photoelectric volume detection module with the photoelectric sensing signal output end of the sensing device module, and connect the photoelectric volume change signal input end of the comparator with the photoelectric volume change signal output end of the photoelectric volume detection module, and compare The error signal output end of the controller is connected to the error signal input end of the compensation loop, the compensation signal output end of the compensation loop is connected to the compensation signal input end of the cuff pressure control module, and the cuff pressure adjustment signal output end of the cuff pressure control module is connected to the cuff With the pressure adjustment signal input end of the sensing device module;

The control target value automatic detection device based on the blood pressure beat-by-beat detection device also includes a pressure output and calculation module, a wavelet filter amplification module, a control target value I _O calculation module and a high-frequency pressure wavelet generation module; the pressure output and calculation module The average pressure signal input end of the cuff is connected to the average pressure signal output end of the sensing device module, the pressure output and the average pressure signal output end of the calculation module are connected to the average pressure signal input end of the high-frequency pressure wavelet module, and the high-frequency pressure wavelet module The high-frequency pressure wavelet signal output end of the cuff is connected to the high-frequency pressure wavelet signal input end of the sensing device module, and the photoelectric volume change signal input end of the wavelet filter amplification module is connected to the photoelectric volume change signal output of the photovolume detection module Terminal, the filter data signal output end of the wavelet filter amplification module is connected to the filter data signal input end of the control target value I ₀ calculation module, and the control target value signal output end of the control target value I ₀ calculation module is connected to the control target value signal input of the comparator end. .

Adopt the detection method of the control target value automatic detection device based on the above-mentioned beat-by-beat detection device for blood pressure, the specific process of the detection method is:

Step 1, open the output switch of the average blood pressure signal value of the pressure output and calculation module, and output the average blood pressure signal value in the current cuff calculated at this time to the high-frequency pressure wavelet generation module;

Step 2. After receiving the pressure output and the average blood pressure value of the calculation module, the high-frequency pressure wavelet generation module generates a high-frequency pressure wave centered on the average blood pressure value, with an amplitude of 5 mmHg or 10 mmHg and a frequency of 10 Hz or 20 Hz; This pressure wavelet signal is input to the pressure wavelet signal input end of the cuff and sensing device module;

Step 3: The cuff and the sensing device module receive the pressure wavelet signal, use the internal photoelectric sensor to detect the photoelectric signal in the radial artery during the pressurization process, and obtain the photoelectric signal during the pressurization process;

Step 4: The photoelectric volume detection module uses the photoelectric signal in the pressurization process obtained in step 3 to detect the DC signal PGdc value I and the AC signal PGac of the photovolume change according to the change of the photoelectric signal in the blood vessel, and converts the DC signal of the photovolume change to The signal PGdc value I is input to the input terminal of the photocapacitance change signal of the comparator, and meanwhile, the AC signal PGac of the photocapacitance change signal detected by the photocapacitance detection module is input to the photocapacitance change signal input end of the filter amplification module;

Step five, input the AC signal PGac of the photoelectric volume change signal of the filter amplification module in step four to obtain the photoelectric volume change signal in the radial artery caused by high-frequency pressure waves through filtering, and use the volume vibration method to determine the new servo control target value I ₀ , and output to the control target value input terminal of the comparator to replace the old servo control target value, and use this target value as the reference value at the next instant to continue the continuous detection of blood pressure;

Step 6, in the comparator, compare the DC signal PGdc value I of the photocapacitance change input by the photocapacitance detection module with the new servo control target value _I0 determined in step five, and obtain the error value ⊿I;

Step seven, the comparator transmits the error value ⊿I obtained in step six to the compensation circuit, and the compensation circuit calculates the pressure compensation signal value that makes the DC signal PGdc value I of the photoelectric volume change equal to the current control target value _I0 according to the PID algorithm, Output this compensation signal;

Step eight, the cuff pressure control module uses the compensation signal output in step seven to calculate the current blood pressure change, and obtains the control signal of the cuff intake and exhaust volume, so that the air pressure in the cuff always follows the change of the internal pressure of the blood vessel, that is The intravascular photoelectric volume I is approximately equal to the servo control target value I _0;

Step 9, after the cuff and sensing device module receives the control signal of the cuff intake and exhaust volume obtained in step 8, the internal pressure sensor detects the pressure signal in the cuff to obtain the pressure signal in the cuff at this time, Input the pressure signal in the cuff at this time to the pressure signal input end of the pressure output and calculation module to obtain the pressure waveform signal and blood pressure value at this time. When it is necessary to detect a new servo control target value, return to step 1; otherwise, close the output switch of the pressure output and the average blood pressure signal value of the calculation module, and continue blood pressure detection based on the current control target value I ₀ .

The present invention uses the high-frequency pressure signal wavelet generation module to implement the method of applying high-frequency wavelets to measure the current servo control target value without interrupting the continuous detection of blood pressure, so that the change of blood vessel characteristics caused by the change of the detection position and the influence of psychological factors The real-time blood pressure can be effectively tracked, and the control target value can be adjusted to improve the accuracy of continuous blood pressure detection without interrupting the normal detection. Moreover, since the applied high-frequency wavelet has a sufficiently large frequency multiple compared with the normal blood pressure wave, it can ensure that the obtained servo control target value has sufficient precision. the

Description of drawings

FIG. 1 is a block diagram of a blood pressure detection device for automatically detecting a blood pressure control target value. the

Detailed ways

Specific Embodiments 1. This embodiment is described in conjunction with FIG. 1. The control target value automatic detection device based on the blood pressure beat-by-beat detection device described in this embodiment includes a cuff and a sensing device module 2, a photoelectric volume detection module 3, Comparator 6, compensation circuit 7 and cuff pressure signal control module 8; The photoelectric sensing signal output end of described cuff and sensing device module 2 connects the input end of the photoelectric signal of photoelectric volume detection module 3, photoelectric volume The photocapacitance volume change signal output terminal of the detection module 3 is connected to the photocapacitance volume change signal input terminal of the comparator 6, the error signal output terminal of the comparator 6 is connected to the error signal input terminal of the compensation circuit 7, and the compensation signal output terminal of the compensation circuit 7 is connected to The compensation signal input end of the cuff pressure control module 8, and the cuff pressure adjustment signal output end of the cuff pressure control module 8 are connected to the pressure adjustment signal input end of the cuff and the sensing device module 2;

The control target value automatic detection device based on the beat-by-beat detection device of blood pressure also includes a pressure output and calculation module 1, a wavelet filter amplification module 4, a control target value I _O calculation module 5 and a high-frequency pressure wavelet generation module 9; The average pressure signal input end of the output and calculation module 1 is connected to the average pressure signal output end of the cuff and the sensing device module 2, and the pressure output and the average pressure signal output end of the calculation module 1 are connected to the average pressure signal of the high-frequency pressure wavelet module 9 The input end, the high-frequency pressure wavelet signal output end of the high-frequency pressure wavelet module 9 is connected to the cuff and the high-frequency pressure wavelet signal input end of the sensing device module 2, and the photoelectric volume change signal input end of the wavelet filter amplification module 4 is connected The photoelectric volume change signal output end of the photoelectric volume detection module 3, the filtered data signal output end of the wavelet filter amplification module 4 is connected to the filtered data signal input end of the control target value I ₀ calculation module 5, and the control target value I ₀ calculation module 5 The control target value signal output terminal is connected to the control target value signal input terminal of the comparator 6 .

Specific embodiment two, the detection method of the automatic detection device based on the blood pressure control target value of the blood pressure beat-by-beat detection device described in the specific embodiment one, the specific process of the detection method is;

Step 1, open the output switch of the average blood pressure signal value of the pressure output and calculation module 1, and output the average blood pressure signal value in the current cuff calculated at this time to the high-frequency pressure wavelet generation module 9;

Step 2: After receiving the pressure output and the average blood pressure value of the calculation module 1, the high-frequency pressure wavelet generating module 9 generates a high-frequency pressure wave centered on the average blood pressure value, with an amplitude of 5 mmHg or 10 mmHg and a frequency of 10 Hz or 20 Hz ; Input the pressure wavelet signal to the pressure wavelet signal input end of the cuff and sensing device module 2;

Step 3: The cuff and sensing device module 2 receive the pressure wavelet signal, use the internal photoelectric sensor to detect the photoelectric signal in the radial artery during the pressurization process, and obtain the photoelectric signal during the pressurization process;

Step 4, the photoelectric volume detection module 3 uses the photoelectric signal obtained in step 3 during the pressurization process to detect the DC signal PGdc value I and the AC signal PGac of the photovolume change according to the change of the photoelectric signal in the blood vessel, and converts the photocapacity volume change The DC signal PGdc value I is input to the input end of the photocapacitance change signal of the comparator 6, and at the same time, the photocapacitance change signal PGac of the photocapacitance change signal detected by the photocapacitance detection module 3 is input to the photocapacitance change signal of the filter amplification module 4 input terminal;

Step 5: Input the AC signal PGac of the photoelectric volume change signal of the filtering and amplifying module 4 in step 4 to obtain the photoelectric volume change signal in the radial artery caused by high-frequency pressure waves through filtering, and use the volume vibration method to determine the new servo control target value I ₀ , and output to the control target value input terminal of the comparator 6 to replace the old servo control target value, and use this target value as the reference value at the next instant to continue the continuous detection of blood pressure;

Step 6, in the comparator 6, compare the DC signal PGdc value I of the photoelectric volume change input by the photoelectric volume detection module 3 with the new servo control target value _I0 determined in step five, and obtain an error value ⊿I;

Step seven, the comparator 6 transmits the error value ⊿I obtained in step six to the compensation circuit 7, and the compensation circuit 7 calculates the pressure compensation that makes the DC signal PGdc value I of the photoelectric volume change equal to the current control target value _I0 according to the PID algorithm Signal value, output this compensation signal;

Step eight, the cuff pressure control module 8 uses the compensation signal output in step seven to calculate the current blood pressure change, and obtains the control signal of the cuff intake and exhaust volume, so that the air pressure in the cuff always follows the change of the internal pressure of the blood vessel, That is, the intravascular photoelectric volume I is approximately equal to the servo control target value I _0;

Step 9: After the cuff and sensing device module 2 receives the cuff intake and exhaust control signals obtained in step 8, the internal pressure sensor detects the pressure signal in the cuff to obtain the pressure signal in the cuff at this time , input the pressure signal in the cuff at this time to the pressure signal input end of the pressure output and calculation module 1 to obtain the pressure waveform signal and blood pressure value at this time. When it is necessary to detect a new servo control target value, return to step 1, otherwise close the output switch of the pressure output and the average blood pressure signal value of the calculation module 1, and continue blood pressure detection based on the current control target value _I0 .

Due to the nonlinear mechanical properties of the blood vessel wall itself, when the sum of the applied high-frequency wavelet and the normal cuff pressure changes near the average blood pressure inside the blood vessel, the relative deformation of the blood vessel wall will also change. The amplitude of the photoplethysmogram generated by the wavelet is different. When the sum of a certain wavelet and the normal cuff pressure value is just equal to the average blood pressure inside the blood vessel, that is, when the blood vessel wall is in an unloaded state, the photoplethysmogram generated by this wavelet has the maximum amplitude. the

Claims (1)

1. based on the blood pressure control desired value automatic detection device of checkout gear by shooting, it is characterized in that, it comprises cuff and sensing device module (2), photoelectricity volume check-out module (3), comparator (6), compensation circuit (7), cuff pressure control module (8), described cuff is connected the input of the photosignal of photoelectricity volume check-out module (3) with the photoelectric sensing signal output part of sensing device module (2), the photoelectricity volume variable signal outfan of photoelectricity volume check-out module (3) connects the photoelectricity volume variable signal input of comparator (6), the error signal outfan of comparator (6) connects the error signal input of compensation circuit (7), the compensating signal outfan of compensation circuit (7) connects the compensating signal input of cuff pressure control module (8), the cuff pressure of cuff pressure control module (8) is adjusted signal output part and is connected cuff and sensing device module (2) pressure adjustment signal input part,

It is characterized in that, described based on blood pressure by shooting the automatic detection device of the controlling of blood pressure desired value of monitoring device also comprise Output pressure and computing module (1), wavelet filtering amplification module (4), control desired value I ₀computing module (5) and high-frequency pressure small echo generation module (9), described Output pressure is connected the average pressure signal output part of cuff and sensing device module (2) with the average pressure signal input part of computing module (1), Output pressure is connected the average pressure signal input part of high-frequency pressure small echo module (9) with the average pressure signal output part of computing module (1), the high-frequency pressure small echo signal output part of high-frequency pressure small echo module (9) connects the high-frequency pressure small echo signal input part of cuff and sensing device module (2), the photoelectricity volume variable signal input of described wavelet filtering amplification module (4) connects the photoelectricity volume variable signal outfan of photoelectricity volume check-out module (3), the filtering data signal output part of wavelet filtering amplification module (4) connects controls desired value I ₀the filtering data signal input part of computing module (5), controls desired value I ₀the control target value signal outfan of computing module (5) connects the control target value signal input of comparator (6).

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