Device for magnetic stimulation

 

The device relates to medical equipment and can be used for functional diagnosis of lesions of the nervous system. The device includes a power supply connected across the power transistor with the primary winding of the pulse transformer, the secondary winding of which is through the output diode is connected with the power capacitor and the power thyristor with a magnetic inductor. To the output power of the capacitor connected to the voltage divider and the power thyristor, to the control input of the power thyristor is connected to the driver, while the current sensor connected to the power transistor, its output connected to the driver, is connected to the control unit, the first and second sensor voltage. The drum is connected to the control unit. The use of the device allows to improve the energy performance of the magnetic stimulator due to the formation control law, in which current consumption is proportional to the supply voltage, which improves the power factor and increases the accuracy of the given parameters of the magnetic pulse. 1 Il.

The invention relates to medical equipment used in the diagnosis of Central and perifericos impacts on the deep region of the brain (including transcranial motor areas of the cortex and spinal cord to determine the parameters of conduction of excitation in the Central structures by subsequent removal of information from various sensors and analysis of the duration of the latent period, speed holding and other parameters.

A device for treatment of diseases of the optic tract [1], comprising a housing, which houses associated with the actuator angular displacement of the permanent magnet, the spring and the magnetic brake, the screen poles of the permanent magnet, in turn mounted on one of the poles of a magnet and rigidly mated with him, and also block the formation of an impulse that controls the actuator. Improving the effectiveness of exposure and reduction of terms of treatment of the optic tract due to generation in the area of influence of magnetic field pulses of only one polarity and close to asymmetric sawtooth form enhances function of excitability and conductivity. The device performs its basic functions, but is composed of complex Electromechanical node, which reduces the reliability of his work.

A device electromagnetic regional component stimulator [2] , containing the generator bipolar electric pulses, which creates with the inductor magnetic field pulses of opposite polarity, the transition from a pulse of one polarity to the pulse of the opposite polarity of soprovojdeniye, but cannot be used for diagnostic purposes, because the shape of the output pulses does not correspond.

There is a magnetic stimulator for the treatment of musculoskeletal tract [3], comprising a housing with a pivotally mounted thereon a pair of movable supports are placed on their surfaces within the areas delimited by the projections of the brush left and right hands, respectively, the emitters of the alternating electric or magnetic fields, low frequencies, infrared, microwave and krainiuchenko radiation, and microwave emitters installed on the host element placed in the area of projection on one of the pillars, and kineviscosity emitters placed in the area of projection of the palm on the opposite leg. The emitters are connected to the outputs of the control unit located in the housing. The device can be used in research, preventive and curative purposes, but has no way of maintaining the set of parameters of the electric or magnetic stimuli.

The closest technical solution is the device [4], which contains the power supply, producing unregulated DC voltage, the power transistor, connected is replaced with the power capacitor. Proposed by the authors embodiment of the device while his health has some disadvantages. Thus, the energy performance of the device in the form of power factor is quite low, because in the process of capacity charge voltage and current are not consistent with each other. In addition, the device does not control the voltage on the power capacity, which reduces its accuracy.

The technical result of the invention is to improve the energy performance of the magnetic stimulator and to increase the accuracy of the device.

This result is due to the fact that the device for magnetic stimulation has the power supply connected across the power transistor with the primary winding of the pulse transformer, the secondary winding of which is through the output diode is connected with the power capacitor and the power thyristor with a magnetic inductor, to the output power of the capacitor connected to the voltage divider and the power thyristor, to the control input of the power transistor connected to the driver, a current sensor connected to the power transistor, its output connected to the first driver input, a second input connected to the first output control unit, partyparty, an input connected to the power transistor, and the fourth driver input connected to the output of the second sensor voltage, the drum is connected with the second input of the control unit, the second output of which is connected with the control input of the power thyristor, and the second voltage sensor associated with the primary winding of the pulse transformer.

The effect of the stimulator based on the effects of magnetic fields on the Central nodes of the brain or spinal cord and receiving a response with the help of special sensors placed on the palms or feet. Round coil stimulator is located over an area of the contralateral projection of the motor cortex with respect to the direction of current flowing in the coil. When you lead with musculature, you need to ensure that the flow of current through the stimulated hemisphere in occipito-front direction; that is, the center of a circular coil is located so that the current irritation went in the clockwise direction (looking from above) for the right hand and Vice versa for the left. In the study of the muscles of the foot, these patterns are not always correct, found considerable individual variability.

Registration of the muscle response are permissible as with the surface of Gnanou stimulation, have a large (1-2 MS) latency than a similar response to transcranial electrical stimulation. The experiment proved that the difference latency connected with the peculiarities of the influence of magnetic field on neuronal structure. For electrical stimulation of the motor neurons are activated in the axonal projections of the mound, are also excited axons in the white matter, therefore, the effectiveness of stimulation and muscle characteristics of the response depend on spinal conduction and excitability of motoneurons at the level of the anterior horns. Magnetic stimulator acts mainly on the Central body of motoneurons, so on the parameters of the evoked response additionally influence the excitability of cortical motoneurons and the state of the axons of the pyramidal path.

In the literature there are no reports of pathomorphological changes in stimulated tissues using magnetic stimulation. Contraindications due to the potential complications in patients after intracranial surgical interventions (especially those associated with the installation of metal clips), in patients with a history of convulsive paroxysms, and patients wearing biomedical devices (e.g. heart pacemaker).

the e is the voltage constant, fed through the power transistor 2 to the primary winding of the pulse transformer 3, the secondary winding of which is output through the diode 4 is connected with the power capacitor 5. To the output power of the capacitor 5 is connected to the voltage divider 6 and the power thyristor 7. Power thyristor 7 connects the power capacitor 5 with a magnetic coil 8, which serves as the source of the magnetic field and represents the inductor is wound inside the protective insulating casing. To the control input of the power transistor 2 is connected to the driver 9, receiving information on the first input from the current sensor 10, the second input from the first output control unit 11, the first input connected to the output of the divider 6, a third input from the first voltage detector 12, the inlet of which is connected to the input of the power transistor 2. The current sensor 10 in turn is connected to the output of the power transistor 2. Manual control to the second input of the control unit 11 is supplied from the controller 13. The second voltage sensor 14 is connected to the primary winding of the pulse transformer 3, the output of the second voltage detector 14 is connected to the fourth input of the driver 9. In addition, the second output control unit 11 is connected to upravlyaushaya 1, used for charging the power capacitor 5, and supplies the rectified voltage to the power transistor 2. The first voltage sensor 12 generates at its output a signal of the presence of the supply voltage, which, when the third input of the driver 9, prepares it for operation. Prior to the receipt of control signals of the power transistor 2 is closed and the charge power capacity 5 does not occur.

When submitting from the controller 13 of the signal of the second input control unit 11 this unit through the first output generates an enable signal at the second input of the driver 9, which in turn signals the opening of the power transistor 2. The power transistor 2 is opened by connecting a constant voltage from the power supply 1 to the primary winding of the pulse transformer 3.

Simultaneously, the current sensor 10 generates a first driver input 9 signal proportional to the current in the primary winding of the pulse transformer 3. This signal is compared with the signal from the first voltage detector 12 and at the moment of equality of these voltages to the driver 9 via the control input of the power transistor 2 closes the latter, leading to the interruption of the current of the primary winding of the pulse transformer 3. After this tense diode 4 and the power capacitor 5. Accumulated in the pulse transformer 3 energy begins to discharge through the output diode 4 on the power capacitor 5, charging him. Thanks to the comparison signal of the current sensor 10 with the signal from the first voltage detector 12, the consumed power scheme from the network current is proportional to input voltage. It corrects the power factor of the device and allows you to get superior energy performance.

So far accumulated in the pulse transformer 3 energy is discharged through the output diode 4 on the power capacitor 5, charging him, the second voltage detector 14 is the signal received at the third input of the driver 9, keeping it off.

As soon as all the energy of the pulse transformer 3 will go into the power capacitor 5, the second voltage sensor 14 will show a decrease in signal voltage at the fourth input of the driver 9 will fall, the driver 9 will turn on and the cycle will repeat again without filing a manual signal from the controller 13.

The voltage to which the charging power to the capacitor 5, is controlled by the voltage divider 6, which can serve as a sensor, stopping charging the power capacitor 5 after reaching the set led is apreta with voltage divider 6. When the control unit 11 through the first output generates an inhibit signal on the second input of the driver 9.

When submitting from the controller 13 to the second input of the control unit 11 of the signal at the discharge of the power capacitor 5, the second output control unit 11, you receive the voltage supplied to the control input of the power thyristor 7, which opens and connects previously charged power of the capacitor 5 with a magnetic inductor 8. There is a discharge of the power capacitor 5 through the coil winding of the magnetic inductor 8, around the coil, the magnetic field of a given magnitude acting on the researcher's chosen area of the cerebral cortex. After discharge and closing of the power thyristor 7 starts charging the power capacitor 5 by the algorithm above.

Example 1. In clinical neurophysiology for patient A. the device magnetic stimulation was applied by the method of time measurement of Central motor conduction (Central Motor Conduction Time (CMCT)), characterizing the functional state of corticospinal way. The parameter was calculated as the difference between latencies of responses during stimulation of the motor cortex and anterior roots of the spinal cord (for brush - on UB the surface, and concentric needle discharge electrodes. When calculating CMCT take into account that the formal definition of the difference latency "in the" CMCT contains spinal synaptic delay (about 1 MS) and the duration of the excitation on the proximal segment of anterior roots (0.3 MS). So true CMCT characterizing the conduct of corticospinal the way, a few less than expected.

Example 2. Magnetic stimulator was used to study the propagation of the excitation of the motor fibers of the peripheral nerves (GMS) patient Century while stimulating them in the proximal segments, where nerve trunks lie deep enough. The results of diagnostic tests allowed to determine disorders of the nervous system without the use of invasive methods.

Example 3. The magnetic stimulator during examination of the patient C. on the subject of the diagnosis of various forms of demyelinating lesions of the Central nervous system (latency by reducing the speed of conduction of excitation along the nerve fibers of large diameter, the most rich myelin) allowed painless to identify the extent of the lesion affecting the nature of the proximal (radicular) segme the private promoter by forming the control law, in which current consumption is proportional to the supply voltage, which improves the power factor and increase the accuracy of the given parameters of the magnetic pulse, since the output voltage of the power capacitor measured by the voltage divider and is involved in the formation control law magnetic flux of the inductor.

Sources of information 1. Patent Of The Russian Federation 2058127. Device for the treatment of diseases of the optic tract. Linnik L. F., Antropov, M., Arnautov L. N., Stromkov A. P. , Boldyreva I. A., Livshits N. Information Bulletin "Discoveries, inventions, industrial designs and trademarks".

2. The Application Of The Russian Federation. Electromagnetic regional one-component stimulator. Zemskov B. G. , Artemov B. C. Informational Bulletin "Discoveries, inventions, industrial designs and trademarks".

3. Patent Of The Russian Federation 2074684. Magnetic stimulator for the treatment of musculoskeletal disorders. Shlygin centuries, Linnik L. F., Maksimov, Century, Ippolitov centuries Informational Bulletin "Discoveries, inventions, industrial designs and trademarks".

4. O. Bulatov, and other Semiconductor charger capacitive energy storage. O. Bulatov, B. C. Ivanov, D. I. is in for magnetic stimulation, includes power supply, connected through the power transistor with the primary winding of the pulse transformer, the secondary winding of which is through the output diode is connected with the power capacitor and the power thyristor with a magnetic inductor, characterized in that the output power of the capacitor connected to the voltage divider and the power thyristor, to the control input of the power transistor connected to the driver, while the current sensor connected to the power transistor, its output connected to the first driver input, a second input connected to the first output control unit, the first input of the latter is connected to the output of the voltage divider, the third driver input connected to the first sensor voltage, the input of which is connected with the power transistor, and the fourth driver input connected to the output of the second sensor voltage, the drum is connected with the second input of the control unit, the second output of which is connected with the control input of the power thyristor and the second voltage sensor associated with the primary winding of the pulse transformer.

 

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