CN2151483Y - Sensitive controller for heart X-ray image by ECG R wave - Google Patents

Abstract

The utility model relates to the improvement of the X-ray machine of the medical application, particularly a sensitive controller for heart X-ray image by ECG R wave. An electrocardiosignal is amplified, detected, and processed by a microprocessor, and then is outputted with a control signal to control the exposing occasion of the X-ray machine, so that the cardiac X-ray images shooting in different periods are at the same cardiac cycle phase, causing to have the comparability, providing the reliable basis for the doctor's clinical diagnosis. The utility model has the advantages of simple structure, high reliability, strong adaptability, and low cost.

Description

Sensitive controller for heart X-ray image by ECG R wave

The utility model relates to the improvement of medical x-ray machine, and particularly a kind of X-ray photograph ecg-r wave triggers exposure-control device.

Heart X-ray plain film is one of important evidence of doctor's clinical diagnosis and treatment cardiac.The X-ray plain film of before the patient treatment and treatment back heart size is compared, as can be seen result of treatment.But, because heart is an organ that constantly carries out periodically diastole and contractile motion, the difference photo that phase is taken out during cardiac cycle, is different in size with vpg connection, two X-ray plain films before and after the treatment, have only to produce when same cycle and go up mutually, just have comparability, draw correct conclusion.But when existing X-ray line machine was taken the photograph sheet, exposure opportunity was random, and (the 0.01-0.1 second) in a flash of exposure, cardiac cycle is outer, and in when what is unknown phase.As a result, the patient is at the different plain films of different times production, because of uncontrollable when same cardiac cycle phase, thereby produce the Error Diagnostics of contrast before and after the cardiac treatment, bring difficulty to diagnosis and treatment work.

The purpose of this utility model is the exposure-control device of a kind of medical x-ray machine of development, with the exposure opportunity of control X line machine, make patient's phase when the heart x-ray plain film of different times production all is in same cardiac cycle, make it to have comparability, for doctor's clinical diagnosis provides reliable basis.

The purpose of this utility model is achieved in that sends the electrocardiosignal of checking out into preamplifying circuit, arrive wave detector through voltage amplifier circuit then, the signal that detects ecg-r wave is sent into microprocessor, handle by microprocessor, and export the exposure opportunity that exposure control signal is controlled X line machine, show the heart rate numeral by display simultaneously.

The utility model has the advantages that: can make the patient when each treatment captured heart X-ray sheet in period is in same cardiac cycle, go up (systole phase or diastole) mutually, thereby make it to have comparability, for doctor's clinical diagnosis provides reliable basis.And simple in structure, the reliability height, adaptability is strong.

Further introduce the utility model below in conjunction with accompanying drawing.

Fig. 1 is the utility model theory diagram (Figure of abstract)

Fig. 2 is the electrocardio input, and the preceding utmost point amplifies, voltage amplification and detector circuit figure

Fig. 3 is a microprocessor, display circuit

Fig. 4 is a power circuit diagram

The R ripple triggers exposure control, the course of work as shown in Figure 1.Amplify by the prime that two limb leadss are imported electrocardio control with electrocardiosignal, this signal send the voltage amplifier stage of subordinate, the voltage amplification signal is carried out detection, detect the R ripple, R ripple signal is sent into single chip microcomputer (8031), handle by this controlled by single chip microprocessor, calculate cardiac cycle or heartbeat number of times, and send into display and show with numeral with the R ripple; Single chip microcomputer begins to examine side R ripple and controls by selected work (systole phase or diastole) mode and trigger the X line exposing when receiving x-ray generator exposure ready signal, can calculate cardiac cycle or heartbeat number of times again and with the numeral demonstration.

Circuit theory diagrams (Fig. 2 and Fig. 3) course of work brief introduction

Limb leads R, L send human ecg signal into BG ₁, BG ₂Carry out the electrocardiosignal prime with the LM741 differential amplifier and amplify, by C ₅, C ₆Lotus root is bonded to the BG of subordinate ₄, BG ₅Carry out voltage amplification, by BG ₅With D ₁Detection promptly detects the R ripple, again by BG ₆Photoelectric coupling circuit is sent into the A end to the R ripple, and (this coupling apparatus has isolation R ripple and detects the different electricity values of partly sending into the single chip microcomputer signal voltage with the R ripple, pay the machine part in order to avoid the R ripple detects part+15V voltage immersion monolithic, change bad single chip microcomputer and reach relevant+5V power voltage supply element; Can reduce the function of undesired signal besides).

Computer part is made up of CPU8031, address latch 74ls373, program storage 8KEPROM2732.The 8031st, the core, it support and control under finished coefficient according to handling and result being sent into relevant controlling or display part; 378 is address latch, when program storage reads or writes, is latched in LO address byte in the latch and delivers to respective chip (program storage) LO address byte, does not cause address and data to be obscured.2732 is 8KBPROM, is used for external program register (filling ROM in 8031), state's program.

A end R ripple signal is sent into the input of T0(external counting through Sheffer stroke gate under 8031P1.0 control), 8031 inner counting O count the R ripple, and calculating cardiac cycle and heart rate, calculation result data is sent into 74LS164 through serial port R * D, T * D move register, deliver to common anode light-emitting diode display again and show with numeral.

When 8031INTO(interrupts the application input) receive x-ray generator exposure ready signal CPU response and interrupt, send a control signal to hold R ripple signal to send into INT1(A by P1.1 and interrupt the application input) through Sheffer stroke gate, CPU responds interruption, check the arrival of R ripple, selection according to P1.3(S, S is closed for sending out exposure diastole, S is broken as the systole phase and triggers exposure) selection, send control signal by P1.2 after the judgment processing, control the control of MOC3011 photoelectric coupling bidirectional triode thyristor again through Sheffer stroke gate and trigger the X line exposing, MOC3011 photoelectric coupling bidirectional triode thyristor has the strong and weak voltage of isolation, with light current pressure-controlled high pressure (comparatively speaking), and can adapt to various x-ray generator exposure controls triggers.

Claims (1)

1, a kind of heart X-ray photograph ecg-r wave triggers exposure control unit, it is characterized in that, it comprises: electrocardio input circuit, amplifying circuit, ecg-r wave wave detector, microcomputer data processing circuit, the output terminal of electrocardio input circuit and the input end of amplifying circuit join, the input end of the output terminal of amplifying circuit and ecg-r wave wave detector joins, the input end of the output terminal of wave detector and microcomputer data processing circuit joins, microcomputer data processing circuit output heart rate digital displaying signal and triggering exposure control signal.

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