SU921524A1 - Device for ultrasonic investigation of body tissue - Google Patents

Description

This invention relates to medical technology, in particular to ophthalmic diagnostic devices. A device for ultrasound examination of body tissues is known, which comprises a study unit, a receiver, an acoustic-to-acoustic transducer, connected to a radiation unit and a receiver, a cathode tube with a sweep circuit and a time stamp circuit connected to the radiation circuit and the receiver, and the unit recording and reproducing echograms with a sweep circuit, a sync circuit and a cathode ray tube: {l}. The known device has a number of disadvantages, which include the need to preserve the immobility of the receiving-emitting electroacoustic transducer relative to the object of study for the entire time, necessary for studying the echogram, the ability to study the acoustic properties of the object only during the technical execution of the method, which overloads attention the operator, the relatively small size of the tissue sites being examined at one time, which forces them to conduct a phased survey with the accumulation of intermediate information in the operator's visual memory, as well as the low efficiency of auxiliary photographic devices commonly used to record the results of the study. The purpose of the invention is to obtain long images of the echogram at the desired points in time. This goal is achieved by the fact that a device for ultrasound examination of body tissues, containing a study unit and a receiver, connected to an acoustic-to-acoustic transducer, the first electron-beam tube, through a first p3-driver circuit and a time-stamp circuit connected to the radiation unit and directly to the receiver and the recording unit and playback, including a second electron beam tube, connected through a 1 § TOpyio circuit, at the sweep with a synchronization circuit, a recording and playback unit but connected in series by an external contactor, a control circuit, a voltage divider and a differential amplifier and connected to a voltage divider, an indicator of the number of recorded echograms and a calibrator, the second input of the differential amplifier connected to the output of the receiver, and the outputs to the deflecting plates of the second electron beam tube recording and playback, made with a long afterglow. The drawing shows a block diagram of a device for ultrasound examination of body tissues. The device contains a master oscillator 1, to the outputs of which are connected through a node 2 of a time delay, an output generator 3, a node k sweep delay, and a generator 5 of a marker signal. An ultrasonic transceiver sensor 6 is connected to the output generator 3 and installed during operation directly on the object under study. 7 The sensor 6 is connected to the receiver 8 of the reflected signals, the output of which is connected to the first cathode-ray tube (CRT) 9. The generator 5 of the marker signal through the block-generator 10 is also connected to the vertical deflection plates of the first CRT 9, and the output of the sweep delay node i is connected to the first scanning circuit 11, which, in turn, is connected to the first horizontal deflection plates 9 minutes CRT sensor 6 is mechanically coupled with the contactor 12 HOCH you recording and reproducing unit echogram. The recording and playback unit includes a voltage step divider 13 connected to the output of the calibrator 1, an inverting input of the differential amplifier 15 and an external contactor 12 via the control circuit 16 and the synchronization circuit 17 connected by inputs to the node) delay sweep with control circuit 16, and the output with second sweep circuit 18, which, in turn, is associated with a second electron beam tube 19, characterized by a long afterglow. In this case, the differential amplifier 15 is connected to the output of receiver 8 by a non-inverting input, and the outputs of the second CRT 19 are connected to the vertical deflection plates, and the voltage divider 13 is connected to the number 20 of recorded echograms. The master oscillator 1, the node 2 of the time delay, the oscillator 3 and the sensor 6 form a radiation unit. The device works as follows. When conducting a diagnostic study, the sensor 6 is brought into contact with the object 7 of the study. The master oscillator 1 generates a pulse 1 (which triggers the generator 5 of the marker signal, the sweep delay node and the time delay node 2, which, in turn, activates the output oscillator 3. The pulses coming from the outgoing oscillator are converted into ultrasound by the sensor 6 and emitted into the object 7. Reflected from the internal structure of the object, the ultrasonic oscillations, after being converted in the sensor 6, arrive in the form of electrical pulses at the input of the receiver 8 and, after amplification, are fed to vertically deflecting plates. CRT 9. These same plates receive periodic short time stamp pulses from the blocking generator 10. A horizontal sawtooth voltage is received from the first scanning circuit 11 connected to the output of the node C of the sweep delay terminal to the horizontal plates of the CRT 9. This shows the echogram of the object under investigation.An exactly the same image of the echogram can be obtained on the screen of the second CRT 19 of the recording and reproducing unit of the echograms, which is provided by the arrival of an acoustic signal repeating the form of the echogram, output of the receiver 8 of the reflected signals through the differential amplifier 15 to the vertically deflecting plates of a CRT 19. The operation of the second scanning circuit 18 is synchronized with the operation of the first scanning circuit 11 through the synchronization circuit 17 connected to the output of the scanning delay nodes C.

Due to the properties of the screen of the second CRT 19, the image obtained on it can be maintained for a long time. In order for repeated CRT beam sweep cycles 19 not to degrade the quality of the image obtained on its screen, the CRT electron beam 19 is locked by a special single-shot sweep circuit with blocking from subsequent work cycles located in the synchronization circuit 17 (not shown).

Thus, recording the image on the screen of the CRT 19 can only be obtained by applying a deblocking pulse to the input of the synchronization circuit 17, which controls the operation of the single-start circuit. This impulse comes through the control circuit 16 when the contactor 12 is triggered at any moment selected by the operator.

To eliminate overlapping recorded echograms, in order to obtain a series of echograms, the scanning line of the CRT beam 19 is sequentially shifted by a certain, pre-selected value after recording each echogram. This is achieved by generating a stepwise voltage of the divider 13 nd command from the control circuit 16 when the contactor 12 is triggered and this voltage is applied to the inverting input of the differential amplifier 15. A constant stabilized voltage determining the step of the sweep line offset is generated by the calibrator 1 .

On the display of the indicator 20 connected to the voltage divider 13, the number of echograms recorded in this frame is displayed, equal to the number of times the divider operates.

The use of a device for examining body tissues provides for a more informative ultrasound diagnosis of diseases due to a comprehensive assessment of the acoustic properties of the test organ in various modes of radiation and reception of ultrasonic vibrations, scanning directions and presentation of all collected information on a CRT screen in the form of long-lasting Multiple echograms still image allows you to expand the indications for ultrasound vletvoritelnom, periodic contact with the object sensor studies, as well as enables dobivats complete and detailed decoding echogram body favor Referring still images.

Claims (1)

1. US Patent No. il5t230, cl. 128-661, 1979;