CN107184194B - Automatic blood pressure measuring device and method based on digital control - Google Patents
Automatic blood pressure measuring device and method based on digital control Download PDFInfo
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- CN107184194B CN107184194B CN201710546747.0A CN201710546747A CN107184194B CN 107184194 B CN107184194 B CN 107184194B CN 201710546747 A CN201710546747 A CN 201710546747A CN 107184194 B CN107184194 B CN 107184194B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
- A61B5/0225—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/02108—Measuring pressure in heart or blood vessels from analysis of pulse wave characteristics
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
Abstract
The invention relates to the technical field of blood pressure detection, in particular to a device and a method for automatically measuring blood pressure based on digital control. The measuring device includes: the volume pulse wave acquisition module is used for acquiring the volume pulse wave of a measurement object and processing the acquired volume pulse wave to acquire a photoelectric volume pulse wave; the blood pressure acquisition module is used for acquiring blood pressure information of a measurement object at regular time and processing the acquired blood pressure information to acquire a blood pressure digital signal; and the processing module comprises a first processing unit and a second processing unit, the first processing unit is used for receiving and processing the blood pressure digital signals and then sending the blood pressure digital signals to the second processing unit, and the second processing unit is used for extracting a plurality of characteristic points of photoplethysmography pulse waves and carrying out fitting operation processing on the plurality of characteristic points and the blood pressure digital signals together so as to establish a blood pressure parameter measurement model. The measuring method is realized by the measuring device. The invention preferably realizes automatic and continuous measurement of blood pressure.
Description
Technical Field
The invention relates to the technical field of blood pressure detection, in particular to a device and a method for automatically measuring blood pressure based on digital control.
Background
The pressure of blood on the blood vessel wall, which is usually called blood pressure, is an important physiological parameter reflecting the function of the circulatory system of the human body. Automatic continuous measurement of blood pressure is of great practical significance in medicine, for example, in clinical medicine, continuous monitoring of blood pressure is required for critically ill patients and intraoperative critically ill patients, so that medical staff can take effective rescue measures in time once an accident occurs to a patient.
The existing blood pressure measurement method mainly utilizes a sphygmomanometer or pulse wave conduction time to measure blood pressure, but the two blood pressure measurement methods have certain defects. In the way of measuring blood pressure by using a sphygmomanometer, the measured blood pressure parameters are influenced by many factors such as the elasticity of the blood vessel wall, and the purpose of continuous measurement cannot be achieved. For the way of measuring blood pressure by using pulse wave conduction time, currently, two pulse wave sensors are used for simultaneously measuring different parts of the same individual, the time difference of the same characteristic point of two-way waveforms is identified, and the pulse wave conduction time is obtained, so that a blood pressure measurement model based on the pulse wave conduction time is established.
Disclosure of Invention
The invention provides a blood pressure automatic measuring device based on digital control, which can better realize automatic and continuous measurement of blood pressure.
The automatic blood pressure measuring device based on digital control comprises:
the volume pulse wave acquisition module is used for acquiring volume pulse waves of a measuring object and processing the acquired volume pulse waves to acquire photoelectric volume pulse waves;
the blood pressure acquisition module is used for acquiring blood pressure information of a measurement object at regular time and processing the acquired blood pressure information to acquire a blood pressure digital signal; and
the processing module comprises a first processing unit and a second processing unit, the second processing unit is used for extracting a plurality of characteristic points of photoplethysmography and establishing a blood pressure parameter measurement model, and the first processing unit is used for receiving and processing blood pressure digital signals and then sending the blood pressure digital signals to the second processing unit so as to carry out timing correction on the blood pressure parameter measurement model.
In the invention, the volume pulse wave of a measuring object can be sampled and processed through the volume pulse wave acquisition module, so that a photoelectric volume pulse wave in a digital signal form is obtained and sent to the second processing unit; and then the second processing unit can extract a plurality of characteristic points of photoplethysmography and perform fitting calculation on the characteristic points, so that a blood pressure parameter measurement model is established. That is to say, in the present invention, once the blood pressure parameter measurement model is established, the blood pressure of the collection object can be preferably obtained according to the collected volume pulse wave, thereby preferably realizing automatic measurement of the blood pressure.
In the invention, the second processing unit can analyze the photoelectric volume pulse wave signals by adopting the existing threshold method so as to extract a plurality of characteristic points such as main wave, tidal wave, dicrotic wave peak, dicrotic wave trough and wave trough.
In the present invention, the second processing unit can perform fitting calculation on the plurality of feature points according to the lambert beer's law, and the fitting calculation method is an existing method, and specifically includes: and (3) combining the plurality of characteristic points with the blood flow variation represented by the pulse wave rising period (contraction period), the pulse wave falling period (relaxation period) and the graph area, thereby establishing a blood pressure parameter measurement model.
In addition, the blood pressure acquisition module of the invention can perform blood pressure measurement on a measurement object at regular time, and the first processing unit can analyze data returned by the blood pressure acquisition module, so that blood pressure parameters (such as average pressure, systolic pressure, diastolic pressure and the like) of the measurement object can be acquired at regular time and sent to the second processing unit; the second processing unit can automatically fit the blood pressure parameters uploaded by the first processing unit with the plurality of characteristic points, so that the correction of the blood pressure parameter measurement model is preferably realized; through the design, the real-time accuracy of the blood pressure parameter measurement model can be better ensured, so that the automatic and continuous measurement of the blood pressure is better realized.
In the invention, a correlation model (blood pressure parameter measurement model) of volume pulse wave feature points and blood pressure parameters is established through the second processing unit to calculate the blood pressure parameters, and the blood pressure acquisition module is used for acquiring standard blood pressure parameters at regular time to correct the correlation model at regular time, so that the correction of the blood pressure parameters acquired through the volume pulse waves can be better realized, and the measurement accuracy of the automatic blood pressure measurement device is greatly improved. The automatic blood pressure measuring device disclosed by the invention better solves the problems that the existing blood pressure meter cannot measure continuously and cannot measure quickly enough and the existing measuring method utilizing the pulse wave conduction time is not accurate enough, and has the advantages of simple equipment, noninvasive detection, simplicity and convenience in operation, lower cost and the like.
Preferably, the second processing unit is provided with a storage unit for data storage and a display unit for data output. The storage unit is arranged to store the obtained data preferably, the display unit is arranged to display the data at the second processing unit preferably, and the display unit and the second processing unit can communicate with each other wirelessly (such as Bluetooth, wi-fi and the like).
Preferably, the blood pressure acquisition module comprises a pressure generation unit, a pressure application unit, a pressure sensor, a first signal conditioning unit and a first A/D conversion unit, wherein the pressure generation unit is used for providing a pressure source to the pressure application unit, the pressure application unit is used for applying pressure to a measuring point of a measuring object, the pressure sensor is used for acquiring blood pressure information of the measuring object, the first signal conditioning unit is used for amplifying and filtering signals acquired by the pressure sensor, and the first A/D conversion unit is used for converting the signals processed by the first signal conditioning unit into digital signals and sending the digital signals to the processing module. Thereby preferably realizing blood pressure measurement of the collection object.
Preferably, the pressure generating unit comprises an air pump, the pressure applying unit comprises a sphygmomanometer cuff, the air pump is used for pumping air into the sphygmomanometer cuff, the sphygmomanometer cuff is further provided with an electromagnetic valve for exhausting the air, the air pump and the electromagnetic valve are driven by a first driving unit, and a control signal of the first driving unit is generated by the first processing unit. Therefore, the automatic inflation and exhaust of the cuff of the sphygmomanometer are better realized, and the automatic acquisition of blood pressure information is further facilitated.
Preferably, a branching device is arranged at the cuff of the sphygmomanometer, the branching device comprises a branching device cavity, and 1 branching device air inlet pipe and 3 branching device air outlet pipes which are communicated with the branching device cavity, the air outlet of the air pump is connected into the branching device air inlet pipe, and the 3 branching device air outlet pipes are respectively used for arranging an electromagnetic valve, arranging a pressure sensor and connecting into the cuff of the sphygmomanometer. Thereby preferably realizing blood pressure measurement of the collection object.
Preferably, the volume pulse wave acquisition module comprises a pulse sensor, a second signal conditioning unit and a second A/D conversion module, the pulse sensor is used for acquiring the volume pulse wave of the measurement object and converting the volume pulse wave into an electric signal, the second signal conditioning unit is used for amplifying and filtering the electric signal converted by the pulse sensor, and the second A/D conversion module is used for converting an analog signal processed by the second signal conditioning unit into a photoplethysmography in a digital signal form. Therefore, the photoplethysmogram of the acquisition object can be acquired better.
Preferably, the pulse sensor comprises a light emitting module and a light receiving unit, wherein the light emitting module is used for emitting measuring beams to measuring points of a measuring object, and the light receiving unit is used for receiving optical signals of the measuring beams reflected by the measuring objects and converting the optical signals into electric signals; the light-emitting module comprises a red light-emitting tube and a near-infrared light-emitting tube, the red light-emitting tube and the near-infrared light-emitting tube are used for sequentially and respectively emitting measuring light beams under the drive of a second drive unit, and a control signal of the second drive unit is generated by a second processing unit; the light receiving unit comprises a photoelectric receiving tube, and the photoelectric receiving tube is used for converting reflected light signals of the red light emitting tube and the near infrared emitting tube into electric signals and then sending the electric signals to the second signal conditioning unit. The red light transmitting tube, the near infrared transmitting tube and the photoelectric receiving tube jointly form a reflective pulse sensor, the pulse sensor can indirectly acquire the waveform of the volume pulse wave by measuring the light intensity of reflected light, and then the waveform is sent to the second processing unit through the processing of the second signal conditioning unit, so that the volume pulse wave is better acquired and processed.
In addition, the invention provides a blood pressure automatic measuring method based on digital control based on any one of the blood pressure automatic measuring devices, thereby preferably realizing automatic and continuous measurement of blood pressure.
The blood pressure automatic measuring method based on digital control comprises the following steps:
(1) Volume pulse waves at the brachial artery position of a measurement object are collected through a volume pulse wave collecting module and are converted into photoelectric volume pulse waves in a digital signal form;
(2) Extracting a plurality of characteristic points of photoplethysmography by adopting a second processing unit, and performing fitting operation processing on the plurality of characteristic points to further establish a bleeding pressure parameter measurement model;
(3) The method comprises the steps that a blood pressure acquisition module is adopted to acquire blood pressure information of a measurement object at regular time and convert the blood pressure information into digital signals, and then a first processing unit is used for processing the digital signals output by the blood pressure acquisition module to acquire average pressure, systolic pressure and diastolic pressure;
(4) And fitting and correcting the blood pressure parameter measurement model through the second processing unit according to the data sent by the first processing unit.
The method provided by the invention can be used for preferably and continuously measuring the blood pressure of the acquisition object with higher accuracy.
Preferably, in step (2), the plurality of feature points are subjected to fitting operation according to the lambert beer law. Since fitting operation of the plurality of feature points through the lambert beer law is a mature prior art, the establishment of a blood pressure parameter measurement model is facilitated.
Preferably, a storage unit is used for storing the data at the second processing unit, and a display unit is used for displaying the data output by the second processing unit. So that the storage and output of data can be preferably realized.
Drawings
FIG. 1 is a schematic view of an automatic blood pressure measuring device according to embodiment 1;
fig. 2 is a system block diagram of an automatic blood pressure measuring device according to embodiment 1;
FIG. 3 is a block circuit diagram of a blood pressure collecting module in embodiment 1;
FIG. 4 is a block circuit diagram of the volume pulse wave collecting module according to embodiment 1;
fig. 5 is a flowchart of the blood pressure automatic measurement method in embodiment 1.
Detailed Description
For a further understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings and examples. It is to be understood that the examples are illustrative of the invention and not restrictive.
Example 1
As shown in fig. 1, the present embodiment provides an automatic blood pressure measuring device based on digital control. It comprises the following steps: a volume pulse wave collecting module 110, configured to collect a volume pulse wave of a measurement object, and process the collected volume pulse wave to obtain a photoplethysmographic pulse wave; a blood pressure collecting module 120 for collecting blood pressure information of the measurement object at regular time and processing the collected blood pressure information to obtain a blood pressure digital signal; and the processing module comprises a first processing unit and a second processing unit, the second processing unit is used for extracting a plurality of characteristic points of photoplethysmography and establishing a blood pressure parameter measurement model, and the first processing unit is used for receiving and processing a blood pressure digital signal and then sending the blood pressure digital signal to the second processing unit so as to carry out timing correction on the blood pressure parameter measurement model.
In this embodiment, the volume pulse wave of the measurement object can be sampled and processed by the volume pulse wave acquisition module 110, so as to obtain a photo-volume pulse wave in a digital signal form and send the photo-volume pulse wave to the second processing unit; and then the second processing unit can extract a plurality of characteristic points of photoplethysmography and perform fitting calculation on the characteristic points, so that a blood pressure parameter measurement model is established. That is to say, in the embodiment, once the blood pressure parameter measurement model is established, the blood pressure of the collection object can be preferably obtained according to the collected volume pulse wave, so that the automatic measurement of the blood pressure is preferably realized.
In this embodiment, the second processing unit analyzes the photoplethysmographic pulse wave signal by using the existing threshold method, so as to extract a plurality of feature points such as a dominant wave, a tidal wave, a dicrotic wave peak, a dicrotic wave trough, and a wave trough.
In this embodiment, the second processing unit performs fitting calculation on the plurality of feature points according to the lambert beer's law, where the fitting calculation method is an existing method, and specifically includes: and (3) establishing a blood pressure parameter measurement model by combining the plurality of characteristic points with the blood flow variation represented by the pulse wave ascending period (systolic period), the pulse wave descending period (diastolic period) and the graph area.
In addition, it is also particularly important that the blood pressure acquisition module 120 can periodically measure the blood pressure of the measurement object, and the first processing unit can analyze the data returned from the blood pressure acquisition module 120, so as to periodically obtain the blood pressure parameters (such as average pressure, systolic pressure, diastolic pressure, etc.) of the measurement object and send the parameters to the second processing unit; the second processing unit can automatically fit the blood pressure parameters uploaded by the first processing unit with the plurality of characteristic points, so that the correction of the blood pressure parameter measurement model is preferably realized; through the design, the real-time accuracy of the blood pressure parameter measurement model can be better ensured, so that the automatic and continuous measurement of the blood pressure is better realized.
In addition, in this embodiment, the first processing unit and the second processing unit are both implemented by using an MCU and can perform data interaction wirelessly with each other. Of course, the first processing unit and the second processing unit may also interact via a data bus.
In this embodiment, a correlation model (blood pressure parameter measurement model) between the volume pulse wave feature point and the blood pressure parameter is established by the second processing unit to calculate the blood pressure parameter, and the blood pressure acquisition module 120 is used to acquire the standard blood pressure parameter at regular time to correct the correlation model at regular time, so that the correction of the blood pressure parameter acquired by the volume pulse wave can be better realized, and the measurement accuracy of the automatic blood pressure measurement device in this embodiment is greatly improved. The automatic blood pressure measuring device of the embodiment better overcomes the problems that the existing blood pressure meter measuring mode cannot continuously measure and the measurement is not quick enough, and the existing pulse wave conduction time measuring mode is not accurate enough, and has the advantages of simple equipment, noninvasive detection, simplicity and convenience in operation, lower cost and the like.
In addition, in this embodiment, the second processing unit is further provided with a storage unit for data storage and a display unit for data output. The storage unit is configured to preferably store the obtained data, the display unit is configured to preferably display the data at the second processing unit, and the display unit and the second processing unit can communicate with each other wirelessly (in this embodiment, bluetooth is used).
As shown in fig. 2, the blood pressure collecting module 120 includes a pressure generating unit, a pressure applying unit, a pressure sensor, a first signal conditioning unit and a first a/D converting unit, the pressure generating unit is configured to provide a pressure source to the pressure applying unit, the pressure applying unit is configured to apply pressure to a measurement point of a measurement object, the pressure sensor is configured to collect blood pressure information of the measurement object, the first signal conditioning unit is configured to amplify and filter a signal collected by the pressure sensor, and the first a/D converting unit is configured to convert the signal processed by the first signal conditioning unit into a digital signal and send the digital signal to the processing module.
As shown in fig. 3, the pressure generating unit includes an air pump, the pressure applying unit includes a cuff of the sphygmomanometer, the air pump is used for pumping air into the cuff of the sphygmomanometer, an electromagnetic valve for exhausting air is further disposed at the cuff of the sphygmomanometer, the air pump and the electromagnetic valve are both driven by a first driving unit, and a control signal of the first driving unit is generated by the first processing unit. In addition, a branching device is arranged at the cuff of the sphygmomanometer, the branching device comprises a branching device cavity, and 1 branching device air inlet pipe and 3 branching device air outlet pipes which are communicated with the branching device cavity, the air outlet of the air pump is connected into the branching device air inlet pipe, and the 3 branching device air outlet pipes are respectively used for arranging an electromagnetic valve, arranging a pressure sensor and connecting into the cuff of the sphygmomanometer.
In this embodiment, the pressurizing unit includes a cuff of the sphygmomanometer, so that the pressurizing unit can be preferably disposed at the measurement object.
In this embodiment, the first driving unit includes driving circuits for driving the air pump and the electromagnetic valve respectively, so that the first processing unit can automatically control the air pump and the electromagnetic valve respectively, thereby preferably realizing automatic inflation and exhaust of the cuff of the sphygmomanometer, and further facilitating realization of automatic acquisition of blood pressure information; in addition, a pressure adjusting unit is arranged between the air pump and the air inlet pipe of the branching device, and can stabilize the air inlet flow at the cuff of the sphygmomanometer, so that when blood pressure information is collected, uniform inflation at the cuff of the sphygmomanometer can be better realized, and the pressure sensor can accurately collect the blood pressure information of a measurement object at an inflation stage, thereby greatly improving the accuracy and efficiency of the collected blood pressure information.
In this embodiment, the pressure sensor is used for measuring the airflow pressure at the splitter cavity, and the signal output by the pressure sensor is processed by the first signal conditioning unit and then uploaded to the first processing unit.
In this embodiment, the solenoid valve can be connected with the branching device outlet duct that corresponds through the rubber tube to be convenient for set up.
In this embodiment, the first processing unit can control the corresponding driving circuit to drive the air pump to operate at regular time according to the blood pressure condition of the measurement object, and the air pump can inflate the cuff of the sphygmomanometer at a constant speed to reach a certain value by adjusting the pressure adjusting unit, and the pressure sensor can better collect the blood pressure information of the measurement object during the inflation process; meanwhile, the pressure sensor can convert the collected blood pressure signal into an electric signal and send the electric signal to the first signal conditioning unit; the first signal conditioning unit comprises a pre-amplification unit, a filtering unit and a secondary amplification unit, so that secondary amplification and filtering can be performed on the signal output by the pressure sensor, and interference can be better removed on the signal output by the pressure sensor. Then, when the measurement is completed, the first processing unit drives the electromagnetic valve to operate through the corresponding driving circuit, so that the automatic and quick deflation of the cuff of the sphygmomanometer is preferably realized.
In this embodiment, the pressure sensor is a piezoelectric sensor, and the pressure adjusting unit is a flow valve.
In addition, the volume pulse wave collecting module 110 includes a pulse sensor, a second signal conditioning unit and a second a/D conversion module, the pulse sensor is used for collecting the volume pulse wave of the measurement object and converting the volume pulse wave into an electrical signal, the second signal conditioning unit is used for amplifying and filtering the electrical signal converted by the pulse sensor, and the second a/D conversion module is used for converting the analog signal processed by the second signal conditioning unit into a photoplethysmography pulse wave in a digital signal form.
As shown in fig. 4, the pulse sensor includes a light emitting module and a light receiving unit, the light emitting module is configured to emit a measuring beam to a measuring point of a measuring object, and the light receiving unit is configured to receive an optical signal of the measuring beam reflected by the measuring object and convert the optical signal into an electrical signal; the light emitting module comprises a red light emitting tube 111 and a near infrared emitting tube 112, the red light emitting tube 111 and the near infrared emitting tube 112 are used for sequentially and respectively emitting measuring light beams under the driving of a second driving unit, and a second driving unit control signal is generated by a second processing unit; the light receiving unit comprises a photoelectric receiving tube 113, and the photoelectric receiving tube 113 is used for converting the reflected light signals of the red light emitting tube 111 and the near infrared emitting tube 112 into electric signals and then sending the electric signals to the second signal conditioning unit.
In this embodiment, the volume pulse wave collecting module 110 further includes a pulse clip, and the red light emitting tube 111, the near infrared emitting tube 112 and the photoelectric receiving tube 113 are disposed at the pulse clip, so that the pulse sensor can be preferably disposed at a plurality of positions of the measurement object, such as a fingertip, an earlobe, a forehead, a wrist, etc. In addition, the clamping force of the pulse clip in the embodiment can be automatically adjusted through the second processing unit, so that the second processing unit can automatically adjust the fitting degree of the pulse sensor and the measuring object by adjusting the tightness of the pulse clip according to the intensity of the pulse signal of the measuring object, and the pulse sensor can adjust the volume pulse wave of the measuring object more quickly and accurately.
In this embodiment, the red light emitting tube 111, the near infrared emitting tube 112 and the photoelectric receiving tube 113 together form a reflective pulse sensor, and the pulse sensor can indirectly obtain the waveform of the volume pulse wave by measuring the light intensity of the reflected light, and then send the waveform to the second processing unit by the processing of the second signal conditioning unit, thereby preferably realizing the collection and processing of the volume pulse wave.
In this embodiment, when the volume pulse wave collecting module 110 collects the volume pulse wave, the control signal can be sent to the second driving unit through the second processing unit, so that the red light emitting tube 111 and the near infrared emitting tube 112 can sequentially emit the measuring light beam, wherein the second driving unit includes driving circuits for driving the red light emitting tube 111 and the near infrared emitting tube 112 respectively; then, the photo-receiving tube 113 can receive the optical signal reflected by the measurement object to the measurement light beam and convert the optical signal into an electrical signal, where the electrical signal is an original photo-plethysmographic pulse wave signal, and the original photo-plethysmographic pulse wave signal is weak and is an analog signal; then, the original photoplethysmography signals can be subjected to secondary amplification and filtering at the second signal conditioning unit, so that photoplethysmography with high intensity, small interference and smoothness can be obtained; and then, the second A/D conversion module can convert the analog signals processed by the second signal conditioning unit into digital signals and send the digital signals to the second processing unit, so that the second processing unit can better acquire photoplethysmographic signals.
In this embodiment, the second processing unit includes a calculation and analysis unit, and the calculation and analysis unit can process the received photoplethysmography pulse wave by using the existing algorithm/function module, so as to extract a plurality of feature points in the photoplethysmography pulse wave and perform fitting calculation on the plurality of feature points, thereby being capable of better establishing a correlation model between the feature points of the photoplethysmography pulse wave and the blood pressure parameters, i.e., a blood pressure parameter measurement model.
In this embodiment, a blood pressure parameter measurement model is established according to the lambert beer law.
In addition, based on the blood pressure automatic measuring device of the present embodiment, the present embodiment further provides a blood pressure automatic measuring method based on digital control, which includes the following steps:
(1) Volume pulse waves at the brachial artery of the measurement object are collected through the volume pulse wave collecting module 110 and converted into photoelectric volume pulse waves in a digital signal form;
(2) Extracting a plurality of characteristic points of photoplethysmography by adopting a second processing unit, and performing fitting operation processing on the plurality of characteristic points to further establish a bleeding pressure parameter measurement model;
(3) The blood pressure acquisition module 120 is used for acquiring blood pressure information of a measurement object at regular time and converting the blood pressure information into digital signals, and then the digital signals output by the blood pressure acquisition module 120 are processed through the first processing unit to acquire average pressure, systolic pressure and diastolic pressure;
(4) And fitting and correcting the blood pressure parameter measurement model through the second processing unit according to the data sent by the first processing unit.
In this embodiment, in the step (2), the fitting operation is performed on the plurality of feature points according to the lambert beer law.
In this embodiment, a storage unit is used to store data in the second processing unit, and a display unit is used to display data output by the second processing unit.
As shown in fig. 4, when the automatic blood pressure measuring device of the present embodiment is used to automatically and continuously measure the blood pressure of a measurement object, a cuff of a sphygmomanometer can be first placed at an upper arm brachial artery of the measurement object, and a pulse clamp is provided, so as to eliminate hydrostatic pressure, the measurement object should be ensured to lie horizontally or have an arm placed in parallel and be located at the same horizontal plane with the heart; then, the volume pulse wave collecting module 110 can be in a working state, so as to process the volume pulse wave of the measurement object, and establish a bleeding pressure parameter measurement model through the second processing unit; meanwhile, during the continuous measurement, the first processing unit controls the blood pressure collecting module 120 to collect the blood pressure information of the measurement object at regular time and send the blood pressure information to the second processing unit, so that the second processing unit can correct the blood pressure parameter measurement model at regular time.
In this embodiment, one operation cycle of the blood pressure collecting module 120 is as follows: firstly, the first processing unit controls the electromagnetic valve to be cut off; then, the first processing unit controls the air pump to operate, and the pressure adjusting unit controls the air pump to slowly and uniformly inflate the cuff of the sphygmomanometer in a linear mode, so that the upper arm of the measuring object is gradually pressurized; in the inflating process, the pressure sensor works and acquires the airflow pressure at the cavity of the splitter, signals output by the pressure sensor are processed by the first signal conditioning unit and then are uploaded to the first processing unit, and the first processing unit calculates blood pressure parameters (including average pressure, systolic pressure and diastolic pressure) of a measurement object according to the received signals and sends the blood pressure parameters to the second processing unit; then, after the air pump pumps a certain value of air (enough to ensure that the pressure sensor finishes detection), the first processing unit controls the air pump to be closed and the electromagnetic valve to be opened, so that the air in the cuff of the sphygmomanometer is discharged. The blood pressure collection module 120 repeats the above actions when the next timed interval arrives.
In this embodiment, the timing control of the blood pressure collecting module 120 can be realized by the first processing unit.
The present invention and its embodiments have been described above schematically, and the description is not intended to be limiting, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, without departing from the spirit of the present invention, a person of ordinary skill in the art should understand that the present invention shall not be limited to the embodiments and the similar structural modes without creative design.
Claims (7)
1. Automatic blood pressure measuring device based on digital control, its characterized in that: comprises the steps of (a) preparing a substrate,
the volume pulse wave acquisition module (110) is used for acquiring the volume pulse wave of a measurement object and processing the acquired volume pulse wave to acquire a photoelectric volume pulse wave;
the blood pressure acquisition module (120) is used for acquiring blood pressure information of a measurement object at regular time and processing the acquired blood pressure information to acquire a blood pressure digital signal; and
the processing module comprises a first processing unit and a second processing unit, the second processing unit is used for extracting a plurality of characteristic points of photoplethysmography and establishing a blood pressure parameter measurement model, and the first processing unit is used for receiving and processing a blood pressure digital signal and then sending the blood pressure digital signal to the second processing unit so as to carry out timing correction on the blood pressure parameter measurement model;
the second processing unit is provided with a storage unit for data storage and a display unit for data output;
the blood pressure acquisition module (120) comprises a pressure generation unit, a pressure application unit, a pressure sensor, a first signal conditioning unit and a first A/D conversion unit, wherein the pressure generation unit is used for providing a pressure source for the pressure application unit, the pressure application unit is used for applying pressure to a measuring point of a measuring object, the pressure sensor is used for acquiring blood pressure information of the measuring object, the first signal conditioning unit is used for amplifying and filtering signals acquired by the pressure sensor, and the first A/D conversion unit is used for converting the signals processed by the first signal conditioning unit into digital signals and sending the digital signals to the processing module;
the volume pulse wave acquisition module (110) comprises a pulse sensor, a second signal conditioning unit and a second A/D conversion module, wherein the pulse sensor is used for acquiring the volume pulse wave of a measurement object and converting the volume pulse wave into an electric signal, the second signal conditioning unit is used for amplifying and filtering the electric signal converted by the pulse sensor, and the second A/D conversion module is used for converting an analog signal processed by the second signal conditioning unit into a photoelectric volume pulse wave in a digital signal form.
2. The automatic blood pressure measuring device based on digital control according to claim 1, characterized in that: the pressure generating unit comprises an air pump, the pressing unit comprises a sphygmomanometer cuff, the air pump is used for pumping air into the sphygmomanometer cuff, an electromagnetic valve used for discharging the air is further arranged at the sphygmomanometer cuff, the air pump and the electromagnetic valve are driven by a first driving unit, and a control signal of the first driving unit is generated by a first processing unit.
3. The automatic blood pressure measuring device based on digital control according to claim 2, wherein: the sphygmomanometer cuff is provided with a branching device, the branching device comprises a branching device cavity, 1 branching device air inlet pipe and 3 branching device air outlet pipes, the branching device air inlet pipe and the 3 branching device air outlet pipes are communicated with the branching device cavity, the air outlet of the air pump is connected into the branching device air inlet pipe, and the 3 branching device air outlet pipes are respectively used for being provided with an electromagnetic valve, a pressure sensor and a sphygmomanometer cuff.
4. The automatic blood pressure measuring device based on digital control according to claim 1, wherein: the pulse sensor comprises a light-emitting module and a light-receiving unit, wherein the light-emitting module is used for emitting measuring beams to measuring points of a measuring object, and the light-receiving unit is used for receiving optical signals of the measuring beams reflected by the measuring object and converting the optical signals into electric signals; the light-emitting module comprises a red light-emitting tube (111) and a near-infrared light-emitting tube (112), the red light-emitting tube (111) and the near-infrared light-emitting tube (112) are used for sequentially and respectively emitting measuring light beams under the drive of a second driving unit, and a control signal of the second driving unit is generated by a second processing unit; the light receiving unit comprises a photoelectric receiving tube (113), and the photoelectric receiving tube (113) is used for converting reflected light signals of the red light emitting tube (111) and the near infrared emitting tube (112) into electric signals and then sending the electric signals to the second signal conditioning unit.
5. The blood pressure automatic measuring method based on digital control comprises the following steps:
(1) Volume pulse waves at the brachial artery of a measuring object are acquired through a volume pulse wave acquisition module (110) and are converted into photoelectric volume pulse waves in a digital signal form;
(2) Extracting a plurality of characteristic points of photoplethysmography by adopting a second processing unit, and performing fitting operation processing on the plurality of characteristic points to further establish a bleeding pressure parameter measurement model;
(3) The method comprises the steps that a blood pressure collecting module (120) is used for collecting blood pressure information of a measured object at regular time and converting the blood pressure information into digital signals, and then a first processing unit is used for processing the digital signals output by the blood pressure collecting module (120) to obtain average pressure, systolic pressure and diastolic pressure;
(4) And fitting and correcting the blood pressure parameter measurement model through the second processing unit according to the data sent by the first processing unit.
6. The automatic blood pressure measuring method based on digital control according to claim 5, wherein: in the step (2), fitting operation is performed on the plurality of feature points according to the lambert beer law.
7. The automatic blood pressure measuring method based on digital control according to claim 5, wherein: and a storage unit is adopted to store the data at the second processing unit, and a display unit is adopted to display the data output by the second processing unit.
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