RU6999U1 - DEVICE FOR REMOVING FOREIGN BODIES FROM THE EYE CAVITY - Google Patents

Abstract

A device for removing magnetic foreign bodies from the cavity of the eye, containing a control unit with an electromagnet and a power source, characterized in that it is additionally equipped with a switch and a pulse generator with an adjustable frequency, a decoder, an RS-trigger and a key connected in series, and the control unit contains two parallel-connected optocoupler thyristors with diodes, the output “1” of the decoder connected to the input S of the trigger, and the rest of its outputs through the switch connected to the input R of the trigger, This key outputs are connected to the control circuit of the optocoupler thyristors of the control unit.

Description

DEVICE FOR TTT & TP. FOREIGN BODIES

from the cavity of the EYE.

The utility model relates to the field of medicine, namely to “ophthalmology, and can be used to remove magnetic bodies from the eye cavity. It is possible to use the utility model for its intended purpose in other areas of medicine, as well as in veterinary medicine.

A device for removing magnetic foreign bodies from the cavity of the eye containing a body with a tip made of a magnetic alloy (book Medical instruments, devices, equipment. Catalog, book 3, section 07. Ophthalmology and spectacle optics. ML970, 14 health of the USSR, s.bO ) The principle of operation of the known device is that when a magnetic tip approaches a metal magnetic fragment, the magnetic effect gradually increases and the fragment moves towards the tip.However, when a fragment is introduced into the eye shells or when it is weakly magnetic, the known device does not provide a positive result, t. A permanent magnet has a well-defined amplification of magnetic attraction.

There is also known a device for removing magnetic foreign bodies from the eye cavity, made in the form of a solenoid with a metal core and equipped with a power source and a control unit (Prince B.A. Polyak Field Military Ophthalmology FM 1957.Meditsina, C.I. VIV37). An advantage of the known device is the ability to smoothly control the attraction of the magnet by changing the current strength. The disadvantages of the device include its low efficiency when working with weakly magnetic foreign bodies, with their complex configuration and their introduction into the eye tissue. The device does not allow, in addition, to select the least traumatic path for removing a fragment from the eye cavity.

The essence of the utility model is that in a device for removing magnetic foreign bodies, containing a control unit with an electromagnet and a power source,

A61F9 / 00

In addition, a switch and a pulse generator with a variable frequency, a pulse counter, a decoder, an RS trigger and a thyristor key are connected in series with the melda, while the control unit contains two optocoupler thyristors with diodes connected in parallel. The input H of the decoder is connected to the input S of the trigger, and the rest of its outputs are connected via a switch to the input R of the trigger. In this case, the key outputs are connected to the control circuit of the optocoupler thyristors of the control unit of the electromagnet

The device provides the ability to control the frequency and duty cycle of magnetic pulses on an electromagnet, due to which the movement of a foreign body under the action of a magnet occurs spasmodically, which reduces the delaminating and traumatic effect of the fragment on the fabric. A foreign body passes through the tissues of the eye and approaches the tip of the magnet with minimal effort.

The essence of the utility model is illustrated by the figure (Fig.) Where a functional diagram of a device for extracting foreign magnetic bodies from the eye cavity is shown.

The device contains a pulse generator with an adjustable frequency I, pulse counter 2, decoder 3, switch C, B-trigger 5 and thyristor key 6. The control unit with an electromagnet contains parallel connected optocouplers 7 and 8 with diodes 9DO, a protective diode II and an electromagnet 12 The control circuit power is supplied from a direct current source D, and the electromagnet is powered from an alternating current network.

The purpose of the control circuit is to supply the electromagnet with pulses of the spliced mains voltage, regulating | frequency and duty cycle

The device operates as follows: From the output of the generator 1, the pulses arrive at counter 2, At the outputs of the counter 2 a continuously changing binary code appears. This code is fed to the inputs of the decoder 3, which converts the binary code into a unitary one. At the outputs, 2, 3,., To the decoder 3 pulses alternately appear. The pulse from I of the decoder 3 is fed to input 3 of trigger 5 and sets trigger 3 to the state of a logical unit. Impulse with

one of the other outputs of the decoder through the switch 4 is fed to the input R of the trigger 5 and resets the trigger 5 to the state of logical zero. As a result of this, pulses are formed at the output of trigger 3, the frequency of which is equal to:

F "A", where is the pulse frequency of the generator I, L is the conversion factor of the counter 2; duty cycle is equal to:

by -..". where 1 is the output number of the decoder 5,

to which the movable contact of the switch 4 is connected.

Thus, by changing the frequency of the pulses of the generator I and the position of the switch 4, it is possible to adjust, respectively, the frequency and duty cycle of the pulses at the input of trigger 3.

From the output of trigger 3, the pulses are supplied to the key b, which amplifies the amplitude of the pulse current to a value sufficient to control the optocoupler thyristors 7 and 3. From the output of the key b, the amplified pulses enter the control circuit of the thyristors 7iZ. During the action of “MDI”, thyristors 7 and 3 open, forming, together with diodes 9 and 10, a rectifier bridge. The electromagnet 12 emits pulses of the rectified mains voltage, the frequency of which is determined by the frequency, of the generator I, ft duty cycle by the position of the switch 4, Optocoupler thyristors 7 and 3 also provide galvanic isolation of the pulse formation circuits and the electromagnet 12 power circuits.

Diode II is designed to protect thyristors 7 and 3 and diodes 9 and 10 against switching overvoltages.

Gstaniya block 13 generates the voltage necessary to power all elements of the circuit.

The operation of the device for removing magnetic foreign bodies is as follows. Using X-ray diffraction, the localization of the intraocular fragment is determined and the eye is cut out at the sclera projection and the magnet tip 12 is attached to the wound. Using the pulse generator I, decoder 3, RS-trigger 3 and the control unit, pulses are generated on the electromagnet, starting with rare and weak with a shortened borehole. If the foreign body does not move, then the frequency and the duty cycle of 1% of the pulses are changed in different modes. With the beginning of the movement of a foreign body, changing the parameters of the impulses / choose the most optimal path and speed of withdrawal of the fragment from the eye. The beginning of the oscillation of the edges of the wound indicates the approach of the foreign body to the tip of the electromagnet.

The device provides independent control of the frequency and duty cycle of the pulses, while the limits of frequency regulation can vary in the range (Hz, and the duty cycle limit is 0.2f-IceK at a maximum load power of 13 kW. The parameters indicated provide the possibility of reliable removal of fragments of various configurations and various magnetic properties under the conditions of their location.

Applicant: i-g. ch. B1:) hh rt tch nch nd1 on O PomnHi Bi T.I

Claims (1)

A device for removing magnetic foreign bodies from the eye cavity, comprising a control unit with an electromagnet and a power source, characterized in that it is additionally equipped with a switch and a pulse generator with an adjustable frequency, a decoder, an RS-trigger and a key, connected in series, and the control unit contains two parallel-connected optocoupler thyristors with diodes, the output “1” of the decoder connected to the input S of the trigger, and the remaining outputs through a switch connected to the input R of the trigger, This key outputs are connected to the control circuit of the optocoupler thyristors of the control unit.