CN1041877A - General microcomputer fully-automatic extracorporeal reverse beating device - Google Patents

Abstract

The present invention is a kind of computer-shape fully-automatic extracorporeal reverse beating device that grows up on former manual external counterpulsation apparatus basis, be characterized in adopting non-invasive pressure pulse wave signal to carry out closed loop feedback control, the diastolic wave starting point of temporo arterial pressure pulse wave is in the incisura place when guaranteeing counter fighting, to obtain desirable curative effect.On fluorescent screen, show electrocardiogram simultaneously, fill aerofluxus, pressure pulse wave and blood flow waveform and heart rate, premature beat counting, before counter the fighting and during counter fighting pressure pulse wave relaxing period and Syst area than and the relative blood flow value.

Description

A fully automatic external counterpulsation device using a general-purpose microcomputer is a medical instrument for treating various ischemic diseases, and belongs to the field of medical instruments.

Nowadays, in the treatment of various human ischemic diseases such as coronary heart disease, cerebral arteriosclerosis, and central retinal artery embolism, external counterpulsation is used in China to promote the normal circulation of blood flow in the diseased parts of the human body and achieve the purpose of treatment. Most foreign countries use intra-aortic sac counterpulsation (traumatic) to treat ischemic diseases. There are similar instruments with the patent number 85200905 in China, but these instruments are all of the manual type, that is, the QRS wave is detected, and the R wave is used to trigger the inflation and exhaust of the air valve. The inflation time is adjusted manually according to the earlobe pulse wave. There is no obvious notch in the earlobe pulse wave (that is, the dividing point between systole and diastole), and manual adjustment of external counterpulsation cannot achieve good curative effect. It will affect the normal blood ejection during the systole, and has certain potential danger to the human body.

The purpose of this invention is to design a fully automatic non-invasive external counterpulsation control system using a general-purpose microcomputer, which detects the pulse wave signal of the temporal artery (or radial artery, common carotid artery) as the timing of air valve inflation, and then uses the microcomputer Realize feedback control to obtain the best external counterpulsation time and achieve the best therapeutic effect.

The invention has the advantages that the full-automatic control of the inflation time, the exhaust time and the intake and exhaust pressures can be realized, and the accuracy of the inflation time can be ensured. The four-line display of ECG signal, switch valve signal, temporal artery pressure pulse wave signal and temporal artery blood flow signal is realized on 8088 microcomputer. It can also perform heart rate counting, premature beat counting, counterpulsation counting, the ratio of diastolic and systolic area of temporal artery before and during counterpulsation, numerical display of relative blood flow values of temporal artery before and during counterpulsation, and feedback The reciprocal display of stroke time, the icon display of treatment diseases (limbs, heart, eyes), the display of terminal air pressure (0.3, 0.4, 0.5, 0.6kg/cm ² ), the control device has memory function and freeze image Function.

The working principle of the utility model will be described in detail below in conjunction with the accompanying drawings.

Figure 1 is a block diagram of the counterpulsation control system. In the figure, the R wave is detected from the ECG signal, and one path is sent to the heart rate sampling circuit to sample the signal of each cardiac cycle in real time, and one path is used as a heart rate sampling interrupt request signal, which is processed by the interrupt service program Finally, a preliminary inflation and exhaust timing signal is calculated, and the signal is sent to the output drive circuit through the valve opening timing circuit and the valve closing timing circuit, and then the inflation and exhaust of the inflation valve are started, and the A/D conversion circuit respectively samples the Temporal artery pressure pulse wave signal, the 8088 microcomputer continuously compares the change value of temporal artery cut point B during counterpulsation with the value of cut point A before counterpulsation, and generates a control amount that continuously adjusts the inflation time to achieve feedback closed-loop control , The A/D conversion circuit also collects the change value of the blood flow before and during the counterpulsation, which is displayed by the CRT of the microcomputer, so as to quantitatively determine the curative effect of the counterpulsation. The A/D sampling generator circuit is used to ensure the CRT display of the microcomputer, and can continuously refresh or freeze the image. The time scale generating circuit generates standard machine timing, provides screen value display and constantly refreshes the screen. The I/O decoding circuit is used to ensure the coordinated work of the above circuit and 8088 microcomputer CPU.

Figure 2 is the time-phase relationship between temporal artery pressure pulse wave, earlobe pulse wave, electrocardiogram and phonocardiogram. It can be seen from the figure that the tangent point A boundary of the temporal artery pressure pulse wave is very obvious, but there is no obvious tangent point of the earlobe pulse wave. The tangent point A of the temporal artery pressure pulse wave is located at the second heart sound S ₂ (that is, the closing sound of the aorta) after the termination of the T wave of the electrocardiogram (indicating the start of the diastolic period), because the distances from the common carotid artery, temporal artery, and radial artery to the heart are not equal , so the pulse wave traces are slightly different in time.

Figure 3 shows the changes of the earlobe pulse wave and temporal artery pulse wave before and during external counterpulsation. It can be seen from the figure that four minutes after the start of the counterpulsation, the diastolic wave starting point B of the temporal artery pressure pulse wave is different in time from Before counterpulsation, the tangent point A of the pressure pulse wave overlaps, and the diastolic wave rises and exceeds the systolic wave to achieve the best effect. After 55 minutes of counterpulsation, there is no obvious change in its waveform and amplitude, and it is less affected by breathing. Although the earlobe pulse wave can also reflect the counterpulsation effect to a certain extent, the phase of the initial rising point of the earlobe pulse wave cannot be determined, and the waveform and amplitude change greatly after one hour of counterpulsation.

Figure 4 is a program flow chart for realizing a general-purpose microcomputer automatic external counterpulsation system. In the figure, the initialization parameter setting is to set the parameters of encephalopathy, that is, after the program is started, patients with encephalopathy are automatically selected for counterpulsation treatment. The setting of the interrupt vector is used for three interrupt service routines, in order to complete the functions of the solenoid valve switch timing, image display and digital clock control in real time. Before the system starts counterpulsation treatment for the patient, the system must generate a data record format to record various parameters of the patient's condition during the counterpulsation process, so that the doctor can understand and grasp the patient's condition in time.

The present invention uses an ultrasonic flowmeter to detect the blood flow before and during counterpulsation from the temporal artery (or radial artery, common carotid artery), and displays the numerical value on the CRT of the 8088 microcomputer as a standard for the curative effect of external counterpulsation.

The counterpulsation control block diagram 1 of the present invention is made into a hardware board, which is inserted in the 8088 case as an expansion board of the 8088 microcomputer. The electromagnetic valve device and the air bag of output driving, filling and exhausting are prior art.

As a non-invasive mechanical assisted circulation device, the present invention can treat various ischemic diseases such as coronary heart disease, cerebral arteriosclerosis, cerebral thrombosis, cerebral infarction, central retinal artery embolism, ischemic optic atrophy, limb defect, etc. Blood diseases, etc., because the device is fully automatic control, so in addition to being suitable for medical institutions, it is also suitable for family health care and rehabilitation.

Claims (2)

1, a kind of by bed body, the pump housing, the mini-computer that comprise air bag and valve body and detect electrocardiosignal and fully-automatic extracorporeal reverse beating device that the blood flow instrument is formed, it is characterized in that control circuit with microcomputer interface by A/D changer 4, R ripple output circuit 5, heart rate sample circuit 6, I/O decoder 7, time mark generator 8, A/D sample rate generator 9, drive valve pass valve timing circuit 10,11 and form.

2, a kind of fully-automatic extracorporeal reverse beating closed loop is returned the feedback control device, it is characterized in that the pressure pulse wave signal 1 imported as control signal with return feedback signal, and be before the noinvasive triage is surveyed external counterpulsation, the time human body temporo tremulous pulse (or radial artery, common carotid artery) pressure pulse wave signal obtain.

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