CN102727192A - Pulmonary circulation blood pressure monitoring equipment based on body surface phonocardiogram and method for monitoring pulmonary circulation blood pressure by using equipment - Google Patents

Abstract

The invention discloses a method and a device for monitoring the pulmonary circulation blood pressure based on body surface phonocardiogram signals. In monitoring, the mechanical closing time of cardiac valves is used as an input parameter; and the parameters are periodically detected, and the change trend of the pulmonary circulation blood pressure is calculated according to the change trend of the parameters, so the noninvasive pulmonary circulation blood pressure is realized. Because the physiological relationship of the mechanical closing time of cardiac valves and pulmonary circulation blood stream dynamics are utilized in the method, the relative change trend of the pulmonary circulation blood pressure can be monitored under an uncalibrated condition. The equipment for monitoring the pulmonary circulation blood pressure is noninvasive, easy to operate, and low in cost.

Description

A device and method for monitoring pulmonary circulation blood pressure based on body surface heart sounds

technical field

This project belongs to the field of medical devices and involves a non-invasive monitoring instrument for pulmonary blood pressure. It is a non-invasive monitoring of pulmonary circulation hemodynamics based on body surface heart sounds, especially using the valve closing time contained in body surface heart sound signals to monitor subjects. Pulmonary blood pressure, an instrument for continuous monitoring of pulmonary blood pressure in a non-invasive manner. the

Background technique

Existing monitoring of pulmonary circulation blood pressure generally uses invasive right heart catheterization to measure pulmonary circulation blood pressure, which is a "post-event" detection method and is not suitable for early screening of pulmonary circulation hypertension. At present, the common non-invasive pulmonary circulation blood pressure measurement method is ultrasonic Doppler method, but it can only be used in the case of subjects with tricuspid regurgitation, and it requires high skill of the operator, so the application has great limitations. the

Contents of the invention

The invention aims at the problems existing in the prior art and provides a non-invasive, continuous and easy-to-operate pulmonary circulation blood pressure monitoring method and instrument. It can be used for early screening of diseases related to pulmonary circulation and hemodynamics during regular physical examination, or for monitoring the disease progression of suspicious patients, or for evaluating the treatment effect of diseases. the

A device for monitoring pulmonary circulation blood pressure based on body surface heart sounds, comprising the following components:

Heart sound sensor, the heart sound sensor unit is used to obtain the subject's heart sound signal, which can convert the vibration of the heart valve into an electrical signal;

A front-end module, the front-end module is connected to the heart sound sensor unit for amplifying, filtering, and digital-to-analog conversion of the heart sound signal;

Data processor, the data processor feature extraction module is connected with the front-end module for analyzing the heart sound signal, extracting time characteristic parameters, and estimating the variation trend of pulmonary circulation blood pressure according to the variation trend of the characteristic parameters;

The storage module is connected with the data processor and is used to store two aspects: one is used to store the heart sound characteristic parameters acquired earlier and currently, and the other is used to store the physiological relationship between the heart sound characteristic parameters and pulmonary circulation blood pressure. The storage module is a read-only memory or a rewritable memory. the

A display module, the display module is connected with the data processor and is used to display the variation trend of the pulmonary circulation blood pressure. the

The above-mentioned device also includes a keyboard input module, the keyboard input module is connected with the data processor, and is used for setting system parameters, or for inputting calibration parameters during calibration. the

The above-mentioned device also includes a jacket for fixing and installing the device. the

In order to achieve the above object, the present invention provides a non-invasive pulmonary circulation blood pressure monitoring method based on body surface heart sounds, comprising the following steps:

1) Collect heart sound signals from the subjects;

2) Extract multiple time difference information indicating valve closure from the collected heart sound signals, and store them for later use;

3) After a period of time, collect the heart sound signal of the same subject;

4) As described in step 2), extract multiple time difference information indicating valve closure and store them for future use;

5) By analyzing the change trend of the time difference, give the conclusion of the change trend of pulmonary circulation blood pressure: "increase", "maintain" or "decrease";

6) Record the time difference in the regular physical examination to monitor the change of the subject's pulmonary circulation blood pressure. the

The heart sound signal of the same subject is collected at intervals in the step 3). the

The step also includes a statistical average of time parameters. the

The variation trend of the pulmonary circulation blood pressure given in step 5) may be the variation trend of right ventricular systolic pressure and mean pressure. the

The characteristic parameter involved in the present invention is a plurality of time difference information representing valve closing in the heart sound. These parameters can be statistical averages of multiple measurements. The present invention can monitor the change trend of pulmonary circulation right ventricle systolic pressure and mean pressure. the

The non-invasive pulmonary circulation blood pressure provided by the present invention can be applied to regular physical examinations, so as to realize continuous and real-time monitoring of pulmonary circulation blood pressure, and can form a long-term historical record of pulmonary circulation blood pressure of subjects, so that medical staff can make comprehensive judgments on subjects. the

Attached to the manual

Fig. 1 is used to illustrate the operation schematic diagram of the inventive method;

Figure 2 is used to illustrate the characteristic parameters representing the valve closing time difference in heart sounds;

Fig. 3 is used for illustrating the workflow of the present invention;

Fig. 4 is a schematic structural diagram of a pulmonary circulation blood pressure monitoring instrument according to the present invention. the

In the figure: 410 heart sound sensor; 420 front-end module; 430 keyboard input module; 440 data processor; 450 storage module; 460 display module. the

Detailed ways

The implementation of the present invention will be specifically described with reference to FIG. 3 . In view of the fact that the present invention monitors the relative change trend of the pulmonary circulation blood pressure by measuring the heart sound characteristic parameters multiple times, no analysis conclusion can be given for the subject whose heart sound signal is collected for the first time. If the subject has completed multiple (including two) data collection 310 , then read in the previous data 320 and display the previous analysis conclusion 330 . The subject is in a resting state, in a supine position, collects heart sound signals for 3-5 minutes each time 340, extracts the valve closing time difference in each cardiac cycle as heart sound features 350, and saves these data 360 for future use. In order to eliminate the influence of various random factors, it is necessary to perform statistical average processing 370 on the characteristics of the heart sound. Read the relationship 380 between valve closing time and pulmonary circulation hemodynamics from the memory, and combine the change trend of heart sound characteristics before and after, analyze and process 390, draw the conclusion 391 of the change trend of pulmonary blood pressure, and display it. the

As shown in the figure, the heart sound sensor 410 is used to convert the valve vibration into an electrical signal, which is amplified and filtered by the front-end module 420. The data processing module 440 collects the heart sound electrical signal and completes the heart sound feature extraction work. The keyboard input module 430 completes the input of the relationship or calibration parameters between the heart sound characteristics and pulmonary circulation hemodynamics. The storage module 450 is used to store the relationship between heart sound characteristics and pulmonary circulation hemodynamics, previous heart sound characteristics, previous conclusions, current heart sound characteristics, and current analysis conclusions. The display module 460 is used for displaying the long-term change trend of heart sound characteristics and the analyzed change trend of pulmonary circulation blood pressure. the

Claims (9)

1. the pulmonary circulation monitoring of blood pressure equipment based on the body surface hear sounds is characterized in that, comprising:

Heart sound transducer, described heart sound transducer is used to obtain experimenter's cardiechema signals, and it can be converted into the signal of telecommunication with valvular vibration;

Front-end module, described front-end module links to each other with the heart sound transducer unit, be used for to described cardiechema signals amplify, filtering, digital-to-analogue conversion;

Memory module, described memory module links to each other with data processor, is used to store two aspect contents: the one, be used to store early stage and the hear sounds characteristic parameter that obtains, the 2nd, be used to store the physiological relation of hear sounds characteristic parameter and pulmonary circulation blood pressure.

Data processor, described data processor characteristic extracting module links to each other with front-end module, is used to analyze cardiechema signals, extraction time characteristic parameter, and estimate the variation tendency of pulmonary circulation blood pressure according to the variation tendency of characteristic parameter;

Display module, described display module links to each other with data processor, is used to show the variation tendency of pulmonary circulation blood pressure.

2. equipment as claimed in claim 1 is characterized in that, said heart sound transducer unit is made up of pick off or resistance or non-linear element.

3. equipment as claimed in claim 1 is characterized in that, also comprises the keyboard input module, and described keyboard input module links to each other with data processor, is used for the setting of systematic parameter, or is used for the input calibration parameter at timing signal.

4. equipment as claimed in claim 1 is characterized in that, memory module is read only memory or recordable memory.

5. like the arbitrary described equipment of claim 1, it is characterized in that, also comprise an overcoat, be used for fixing and said equipment is installed.

6. the pulmonary circulation monitoring of blood pressure method of the arbitrary described equipment of claim 1-5, its characteristic may further comprise the steps:

1) gathers cardiechema signals on one's body from the experimenter;

2) from the cardiechema signals of gathering, extract a plurality of time difference informations that the expression valve is closed, store subsequent use;

3) behind the certain interval of time, gather same experimenter's cardiechema signals;

4) like said step 2), extract a plurality of time difference informations that the expression valve is closed, store subsequent use;

5) through analyzing the variation tendency of said time difference, provide the variation tendency conclusion of pulmonary circulation blood pressure: " rising ", " maintenance " or " reduction ";

6) in having regular physical checkups, write down described time difference, can monitor experimenter's pulmonary circulation blood pressure situation.

7. pulmonary circulation monitoring of blood pressure method as claimed in claim 6 is characterized in that, said step 3) interval a period of time, gathers same experimenter's cardiechema signals.

8. like claim 6 or 7 described pulmonary circulation monitoring of blood pressure methods, it is characterized in that, also comprise the assembly average of time parameter in the said step.

9. like claim 6 or 7 arbitrary described pulmonary circulation monitoring of blood pressure methods, it is characterized in that the pulmonary circulation blood pressure trend that said step 5) provides can be the variation tendency of right ventricular systolic pressure, mean pressure.

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