CN207627308U - A kind of ambulatory blood pressure measuring device - Google Patents

Abstract

The utility model discloses a dynamic blood pressure measuring device, which comprises a device body, a central processing unit arranged in the device body, a liquid crystal display module, a bluetooth receiving module, an oscillometric blood pressure measuring module, and an independently arranged pulse method blood pressure measuring module; The oscillometric blood pressure measurement module includes a cuff body, rubber tube, pressure sensor, Bluetooth transmission module, air pump, and air valve; the pulse method blood pressure measurement module includes an ECG signal acquisition unit set in the device body, and a watch body set independently , and an acceleration detection unit, a reflective pulse wave acquisition unit, and a bluetooth transmission module arranged in the watch body. The utility model overcomes the problem of inaccuracy in measuring the blood pressure value of the subject during activities; the selection and setting of multiple modes can allow the subject to measure more accurate dynamic blood pressure values during activities.

Description

An ambulatory blood pressure measuring device

technical field

The utility model relates to a novel blood pressure measuring device, which can accurately detect 24-hour dynamic blood pressure by combining two blood pressure measuring methods.

Background technique

Blood pressure is an important physiological parameter of the human body, which can reflect the functional status of the human heart and blood vessels, and is an important basis for clinical diagnosis of diseases, observation of treatment effects, and judgment of prognosis. The blood pressure of the human body changes with the physiological cycle, personal emotions, various external and internal stimuli, and has obvious fluctuations.

Since blood pressure parameters are affected by many factors such as physical condition, environmental conditions and physiological rhythm, there are large differences in the results of single measurement or intermittent measurement, while the continuous measurement method can measure blood pressure in each cardiac cycle, which is widely used in clinical and medical research. has more significance. A simple blood pressure measurement cannot identify those "hidden" hypertensive patients, and they are easily disturbed by emotions, exercise status, etc. Ideal blood pressure monitoring should include ambulatory blood pressure within 24 hours. Compared with occasional blood pressure measurement, ambulatory blood pressure has many advantages. More blood pressure data can be obtained, which can actually reflect the change of blood pressure throughout the day, and can be used to determine drug treatment. It can help to choose drugs, adjust dosage and administration time, and judge whether hypertensive patients have target organ damage; for those who have no previous cardiovascular disease, it is more meaningful to measure ambulatory blood pressure, which can guide medication and predict cardiovascular disease attack.

Ambulatory blood pressure detection is a detection technology that automatically and periodically measures blood pressure in daily life through an instrument. Since the ambulatory blood pressure overcomes the limitations of the small number of blood pressure measurements in the clinic within 24 hours, observation errors, and the "white coat effect", it can more objectively reflect the actual level and fluctuation of 24-hour blood pressure. However, electronic sphygmomanometers are generally used for ambulatory blood pressure detection now, and the following disadvantages may occur: 1) during activities, the blood pressure readings measured each time may be inaccurate, and it is inconvenient to carry; 2) when measuring blood pressure during sleep The sound of inflation and deflation directly affects the sleep of the subject, and indirectly affects the accuracy of nighttime blood pressure values, resulting in the inability to accurately reflect the circadian rhythm of blood pressure.

Contents of the invention

The purpose of this utility model is to provide a dynamic blood pressure measurement device for the deficiencies of the prior art, which combines the cuff-type oscillometric method and the watch-type pulse method to measure dynamic blood pressure, and solves the portability of measuring dynamic blood pressure during activities and accuracy, as well as no disturbance to the subject during nighttime measurement, it can truly and accurately reflect the circadian rhythm of blood pressure.

The utility model comprises a device body, a central processing unit arranged in the device body, a liquid crystal display module, a bluetooth receiving module, an oscillometric blood pressure measurement module, and an independently set pulse method blood pressure measurement module; the signal of the oscillometric blood pressure measurement module The output end is connected with the signal input end of the central processing unit, the signal output end of the pulse method blood pressure measurement module is connected with another signal input end of the central processing unit through the bluetooth module, and the signal end of the liquid crystal display module is connected with the signal end of the central processing unit.

The liquid crystal display module adopts the form of setting buttons and a liquid crystal display on the device body, and the blood pressure measurement mode, the time period used by each mode and the blood pressure measurement mode in different sleep states are set on the liquid crystal display through the buttons.

The central processing module uses the STM32 series chip as the core to control the operation of the entire system and the setting of the user mode, the processing of data signals, the transmission of data, and the like. The system stores the processed data in an SD card or transfers it to a computer via a USB port.

The oscillometric blood pressure measurement module includes a cuff body, a rubber tube, a pressure sensor, an air pump, and an air valve; the air bag in the cuff body communicates with one end of the rubber tube that provides gas, and the other end of the rubber tube communicates with the air pump and the air valve. , Pressure sensor connection; the pressure sensor is used to detect the cuff pressure, the signal output end of the pressure sensor is connected with the signal input end of the central processing unit, and the signal output end of the central processing unit is connected with the signal input end of the air pump and air valve, so as to adjust the cuff Inflate and deflate.

The pulse method blood pressure measurement module includes an electrocardiographic signal acquisition unit arranged in the device body, an independently arranged wristwatch structure, an acceleration detection unit, a reflective pulse wave acquisition unit, and a bluetooth transmission module arranged in the wristwatch structure ;

The ECG signal acquisition unit includes ECG electrodes and an ECG front-end analog chip; the signal output end of the ECG electrode is connected to the signal input end of the ECG front-end analog chip through two leads, and the signal output end of the ECG front-end analog chip is connected to the The signal input terminals of the central processing unit are connected;

The reflective pulse wave acquisition unit includes a photoelectric reflective sensor and a front-end chip; the signal output end of the photoelectric reflective sensor is connected to the signal input end of the front-end chip, and the signal output end of the front-end chip is connected to the signal input end of the Bluetooth sending module;

The acceleration detection unit includes an acceleration sensor; the output end of the acceleration sensor is connected to the signal input end of the Bluetooth transmission module; this unit is a mature technical means for judging the sleep state of the subject, such as the subject is in a deep sleep state, blood pressure The test mode is pulse method measurement. If the subject is in a light sleep state, the blood pressure measurement mode can be oscillometric method, pulse method or both methods simultaneously, depending on the selection of the LCD display module.

The watch structure includes a watch body and a PCB module arranged in the watch body. A protrusion is provided on the contact surface of the watch body with the skin, and the protrusion is arranged at the bottom center of the PCB module. There is a photoelectric reflective sensor inside, and the signal acquisition end of the photoelectric reflective sensor is in contact with the skin surface through a protrusion; the height of the protrusion is 2mm, and the area of the protrusion is 7mm×5mm. The setting is conducive to the realization that the product can collect real data more effectively. The beneficial effects of the utility model are:

1) Overcoming the inaccuracy of the subject's blood pressure measurement during activities;

2) When measuring at night, the subject will not be disturbed;

3) It can accurately measure the blood pressure circadian rhythm of the subject;

4) The choice of multiple modes allows the subject to measure more accurate dynamic blood pressure values during activities;

5) The acceleration detection unit can not only keep the subject from being disturbed when measuring ambulatory blood pressure at night, but also can more accurately measure the circadian rhythm of the subject's blood pressure.

Description of drawings

Fig. 1 is the main module flowchart of the present utility model;

Fig. 2 is the utility model cuff structure schematic diagram;

Figure 3-1 is a schematic structural diagram of the utility model wristwatch;

Fig. 3-2 is a schematic structural diagram of the protrusion on the back of the wristwatch of the present invention;

Marks in the figure: 1 cuff body, 2 air pump, 3 air valve, 4 four-way piece, 5 pressure sensor, 6 acceleration sensor.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further analyzed.

The utility model comprises a device body, a central processing unit arranged in the device body, a liquid crystal display module, a bluetooth receiving module, an oscillometric blood pressure measurement module, and an independently arranged pulse method blood pressure measurement module, as shown in Figure 1; the central processing The pressure value collected by the oscillometric blood pressure measurement module is obtained by the instrument, and the systolic pressure and the diastolic pressure are obtained after analysis and processing; the data processing here belongs to the well-known technology in the art, so it will not be described in detail. The central processor obtains the pulse wave signal collected by the pulse method blood pressure measurement module through the Bluetooth receiving module, and obtains the ECG signal through the ECG signal acquisition unit, and combines the pressure value collected by the oscillometric blood pressure measurement module to analyze and process the obtained blood pressure value ; The data processing here belongs to the well-known technology in the art, so it is not stated in detail.

The liquid crystal display module adopts the form of setting buttons and a liquid crystal display on the device body, and the blood pressure measurement mode, the time period used by each mode and the blood pressure measurement mode in different sleep states are set on the liquid crystal display through the buttons.

The central processing module adopts STM32F429 to control the operation of the whole system, the setting of user mode, the processing of data signal, the transmission of data and so on. The system stores the processed data in an SD card or transfers it to a computer via a USB port.

As shown in Figure 2, the oscillometric blood pressure measurement module includes a cuff body 1, a rubber tube, a pressure sensor 5, an air pump 2, and an air valve 3; the air bag in the cuff body communicates with one end of the rubber tube that provides gas, and the rubber tube The other end is connected with the air pump, the air valve, and the pressure sensor 5 through the four-way piece 4; The terminal is connected to the signal input terminal of the air pump and the air valve, so as to inflate and deflate the cuff.

The pulse method blood pressure measurement module includes an electrocardiographic signal acquisition unit arranged in the device body, an independently arranged wristwatch structure (Fig. 3-1), an acceleration detection unit 6 arranged in the wristwatch structure, a reflective pulse Wave acquisition unit, bluetooth sending module;

The ECG signal acquisition unit includes ECG electrodes and an ECG front-end analog chip; the signal output end of the ECG electrode is connected to the signal input end of the ECG front-end analog chip through two leads, and the signal output end of the ECG front-end analog chip is connected to the The signal input terminals of the central processing unit are connected;

The reflective pulse wave acquisition unit includes a photoelectric reflective sensor and a front-end chip; the signal output end of the photoelectric reflective sensor is connected to the signal input end of the front-end chip, and the signal output end of the front-end chip is connected to the signal input end of the Bluetooth sending module;

The acceleration detection unit includes an acceleration sensor; the output end of the acceleration sensor is connected to the signal input end of the Bluetooth transmission module; this unit is a mature technical means for judging the sleep state of the subject, such as the subject is in a deep sleep state, blood pressure The test mode is the pulse method measurement. If the subject is in a light sleep state, the blood pressure measurement mode can be either the oscillometric method or the pulse method, depending on the selection of the LCD display module.

As shown in Figure 3-2, the wristwatch structure includes a wristwatch body and a PCB module arranged in the wristwatch body. A protrusion is provided on the contact surface of the wristwatch body with the skin, and the protrusion is arranged on the PCB module. At the center of the bottom, there is a photoelectric reflective sensor inside the protrusion, and the signal acquisition end of the photoelectric reflective sensor is in contact with the skin surface through the protrusion; the height of the protrusion is 2mm, the area of the protrusion is 7mm×5mm, and the protrusion is made of silicone Material, the raised setting is conducive to the realization that the product can collect real data more effectively.

work process:

1. The LCD display module selects the blood pressure measurement mode

1) Time: 7:00-20:00;

Measurement mode: oscillometric measurement;

Measurement Interval: Measured every half hour

2) Time: 20:01-6:59;

Measurement mode: pulse method continuous measurement;

The deep sleep state is continuously measured by the pulse method; the light sleep state is measured by the pulse method and the oscillometric method at the same time, and the oscillometric method is measured every hour.

2. Oscillometric blood pressure measurement:

The cuff is wrapped around the upper arm of the subject. The rubber tube of the cuff is connected with the pressure sensor MMR901XA, the air pump DQB100-A, and the air valve DQF1-3A. The central processor STM32F429 realizes the management of the air pump and the air valve through I/O. Detect the cuff pressure, transmit the pressure value to the central processor STM32F429 through SPI communication, and then the central processor STM32F429 calculates the systolic and diastolic blood pressure; use the oscillometric method to measure the time period between 7:00-20:00, every Measure once in half an hour, and the data records are saved in the SD card.

3. Blood pressure measurement by pulse method: pulse detection through the photoelectric reflective sensor DCM03 attached to the skin surface (DCM03 integrates 660nm red light, 905nm infrared light and photoelectric receiving diode on a single chip), collects analog data and transmits it to the front-end chip AFE4400 (AFE4400 is TI's integrated analog front-end, this chip includes a low-noise receiver channel with a 22-bit analog-to-digital converter, an LED transmission part and diagnostic functions for sensor and LED fault detection), the front-end chip for analog signals Perform A/D conversion, and the converted digital signal is sent to the Bluetooth module CC2541 through SPI communication (CC2541 is a real system-on-chip (SoC) solution for low energy consumption and power optimization for private 2.4GHz applications. CC2541 will lead the RF The excellent performance of the transceiver is combined with an industry-standard enhanced 8051MCU, in-system programmable flash memory, 8kB RAM and many other powerful features and peripherals), and the Bluetooth module transmits data to the central processor STM32F429; The electrical signal is connected to the ECG electrode through two lead wires. The ECG electrode is attached to the left lower abdomen and under the clavicle near the right shoulder to collect the ECG signal to the front-end ECG analog chip AD8232. After the signal is processed by the AD8232, it is sent to the center through the ADC port. The processor STM32F429; the central processing unit receives these two signals, and calculates the systolic and diastolic blood pressure from the measured value of the oscillometric method.

4. The acceleration acquisition unit adopts the acceleration sensor MPU6050, which can accurately track fast and slow movements, and at the same time combine the pulse and ECG signals to judge the sleep state of the subject. When exercising, the system will automatically detect the state of motion, and the oscillometric measurement will be suspended and changed to the pulse method measurement; when the subject sleeps at night, the sleep state will be judged. If the subject is in a deep sleep state, the measurement method will be measured by the pulse method. , if the subject is in a light sleep state, the measurement method can be the oscillometric method, the pulse method, or the two methods at the same time, and the choice is made according to the LCD display module.

5. The system can save the test value in the SD card, or upload it to the host computer through the USB port for further data research. And the data can also be displayed on the LCD screen.

The above embodiments are not intended to limit the utility model, and the utility model is not limited to the above embodiments, as long as the requirements of the utility model are met, they all belong to the protection scope of the utility model.

Claims (8)

1. A dynamic blood pressure measurement device, characterized in that it comprises a device body, a central processing unit, a liquid crystal display module, a bluetooth receiver module, an oscillometric blood pressure measurement module, and an independently arranged pulse method blood pressure measurement module arranged in the device body The signal output end of the oscillometric method blood pressure measurement module is connected with the signal input end of the central processing unit, the signal output end of the pulse method blood pressure measurement module is connected with another signal input end of the central processing unit through the bluetooth module, and the signal of the liquid crystal display module The terminal is connected with the signal terminal of the central processing unit; The oscillometric blood pressure measurement module includes a cuff body, a rubber tube, a pressure sensor, an air pump, and an air valve; the air bag in the cuff body communicates with one end of the rubber tube that provides gas, and the other end of the rubber tube communicates with the air pump and the air valve. , Pressure sensor connection; the pressure sensor is used to detect the cuff pressure, the signal output end of the pressure sensor is connected with the signal input end of the central processing unit, and the signal output end of the central processing unit is connected with the signal input end of the air pump and air valve, so as to adjust the cuff Inflate and deflate; The pulse method blood pressure measurement module includes an electrocardiographic signal acquisition unit arranged in the device body, an independently arranged wristwatch structure, an acceleration detection unit, a reflective pulse wave acquisition unit, and a bluetooth transmission module arranged in the wristwatch structure . 2. A kind of dynamic blood pressure measuring device as claimed in claim 1, characterized in that said liquid crystal display module adopts the form of setting a button and a liquid crystal display on the device body, and the blood pressure measurement is set on the liquid crystal display through the button. modes, the time period used by each mode, and the mode of blood pressure measurement in different sleep states. 3. A kind of ambulatory blood pressure measuring device as claimed in claim 1, it is characterized in that described electrocardiogram signal acquisition unit comprises electrocardiogram electrode, electrocardiogram front-end analog chip; The signal input end of the ECG front-end analog chip is connected, and the signal output end of the ECG front-end analog chip is connected with the signal input end of the central processing unit. 4. A kind of dynamic blood pressure measuring device as claimed in claim 1, it is characterized in that the reflective pulse wave acquisition unit comprises a photoelectric reflective sensor, a front-end chip; the signal output terminal of the photoelectric reflective sensor and the signal of the front-end chip The input ends are connected, and the signal output end of the front-end chip is connected with the signal input end of the bluetooth sending module. 5. A kind of dynamic blood pressure measuring device as claimed in claim 1, characterized in that said acceleration detection unit comprises an acceleration sensor; the output end of the acceleration sensor is connected with the signal input end of the bluetooth transmission module in the pulse method blood pressure measurement module . 6. A kind of dynamic blood pressure measuring device as claimed in claim 1, characterized in that the wrist watch structure includes a wrist watch body and a PCB module arranged in the wrist watch body, and the contact surface of the wrist watch body with the skin is set There is a protrusion, and the protrusion is arranged at the bottom center of the PCB module, and a photoelectric reflective sensor is arranged inside the protrusion, and the signal collection end of the photoelectric reflective sensor is in contact with the skin surface through the protrusion. 7. An ambulatory blood pressure measuring device according to claim 6, characterized in that the height of the protrusion is 2mm, and the area of the protrusion is 7mm×5mm. 8. An ambulatory blood pressure measuring device as claimed in claim 6, characterized in that the raised part is made of silica gel.