electric and magnetic medical equipment. characteristics of electric current. amperage is determined...

Electric and Electric and magnetic medical magnetic medical

equipmentequipment

Characteristics of electric current.

Amperage is determined by the ratio of the charge , which is transferred through the cross section of the conductor, the length of time over which this charge is transferred:

dt

dqI

dq

dt


Current density - a quantity which is the ratio of current to the cross-sectional area of the conductor through which this current passes.

dIdS

dS

dIj


In the case of direct current density will be determined by the formula:

S

Ij

Ohm's law in differential form:

current density is proportional to the electric field, and it has the same direction. Here - resistivity - electrical conductivity.

1j E E

Joule-Lenz law in differential form

Skip electric current through biological tissue is accompanied by heating. The amount of heat that is released at the same time:

RtIQ 2

Joule-Lenz law in differential form

Heat capacity per unit volume:

formula of heat and power per unit volume is expressed Joule-Lenz in differential form.

2 2q j E jE

Electrical conductivity of tissues.

Many biological environments are electrolytes. Carriers in electrolytes are positively and negatively charged ions that result from electrolytic dissociation.


The directed movement of ions in the electrolyte can be considered uniform, and the electric force is balanced with the force of friction

where - coefficient of friction - velocity of the ion.

òðe FF qE rr


where - the mobility of ions.

qE bEr

âÅ

b


The mobility of ions is numerically equal to the velocity of ordered motion in the electric field of intensity:

b

1B

Eì

2ì

bñÂ


The electrical conductivity of electrolytes is given by:

Here - the coefficient of electrolytic dissociation - ion concentration.

bbnq

n


Current density in the electrolyte is:

Ebbnqj

Galvanization and electrophoresis treatment.

Apply a small direct current power (50 mA) and voltage of 30-80 V with the purpose of treatment is called galvanization.

Medical electrophoresis - combined effect of direct electric current and the drug substance administered with it.


Conducting electrophoresis procedure


Apparatus for galvanization and electrophoresis STREAM-1


Galvanization and electrophoresis of drug dosing in current density (the number of current active electrode area 1 ), time and number of procedures per treatment. Therapeutic current density in the oral cavity is 0.1-0.5 mA / children 0.05 mA / time of 20-30min, per treatment and 30 treatments.

2см

2см2см


Ingestion medical substance in tissues(galvanization)


There are three types of electrophoresis:

frontal, zonal,continuous.


In frontal electrophoresis macromolecules found throughout the bulk solution and the mobility determined by shlirenovskoyi optics as a function of time.


In the zonal electrophoresis sample micropipette applied as spots or stripes (zones) on the surface of the carrier and move microparticles in solution at different rates according to their electrophoretic properties.


With continuous electrophoresis sample is applied as a band, but it add all the time.


Types of zonal electrophoresis:

Electrophoresis on paper; Electrophoresis on cellulose

acetate; Thin-layer electrophoresis; Gel electrophoresis.


The movement of molecules during the electrophoresis.

Pulsed current and its characteristics.

Electrical impulses called short-term change in amperage. Pulses, called repetitive pulsed current.


Typical plots of momentum are:1-2 front, top 2-3, 3-4 cut (front or

rear), tail 4-5.

2 3

5

4

1

t1 t2 t5

I

Imax

t3,4 t

Імпульсний струм та його характеристики.

I

t T

i

The period of pulse current

T - Is the average time between the startneighboring pulses.


Reciprocal of the period is called the frequency of pulse spacing:

Tf

1

Effects of pulsed current to the tissue.

Irritating effect stumu directly proportional rate of growth of current, ie the steepness of the front pulse.

In certain limits irritant effect is proportional to the pulse duration.

Physiological effects of pulsed current depends on the duty cycle (fill factor).

Electrotherapy.

Implementation procedures electrosleep.

Electrotherapy.

Apparatus for the treatment of electrosleep-ES-10-5 "Electrosleep"

Electrotherapy.

Radius Cranio-01.

Electrotherapy.

The device “Radius Cranio-01" implemented basic types of transcranial electrotherapy (TET), which are widely used in medical practice.

Alternating current.

In the broadest sense alternating current - is any current that varies with time.


Amperage in a circle with a resistor will vary in phase with the applied voltage:

R

tII RR cosmax


Current strength in terms of the inductor will fall in phase from applied voltage to :

L

2

2cosmax

tII LL


Current strength in terms of the capacitor will outperform the phase voltage at :

C

2

2cosmax

tII CC

Vector diagrams areas of amperage and voltage.

maxI maxRU

maxI

max LU

2

maxI

max LU

2

a)

b) c)

Impedance alternating current at stake.

- full resistance range of AC is called impedance.

CLRZ

12

Z

Electrotherapy low frequency currents.

Electrotherapy device "Radius-01".


Portable single-channel device "radius, 01" for the treatment of various diseases using low frequency electrotherapy currents. Beneficial combines the functions for:

- galvanization and electrophoresis; - diadynamic therapy; - extended amplipulse therapy.


Device for electrotherapy currents of low frequency "Radius-01 FT»


Portable single-channel device "radius FT-01" is designed for the treatment of various diseases using low frequency electrotherapy currents. Beneficial combines the functions for:

- galvanization and electrophoresis; - diadynamic therapy; - extended amplipulse therapy; - fluctuarization; - electrical stimulation; - elektrosleep.


Amplipulse therapy - a method of electrotherapy in which the patient is influenced variable sinusoidal modulated currents low power. They combine the advantages of high currents and low frequencies.


Fluctuarization - use for therapeutic purposes AC, partially or fully rectified current low voltage (100 V) with frequency (up to 2000 Hz) and amplitude (up to 3 mA/sm2) that vary randomly.

Electrotherapy high frequency.

Darsonvalization - use for therapeutic purposes high frequency current (IN kHz) and voltage (20-30 kV) at low power (up to 5 mA) current modulated by a series of oscillations lasting 100 ms following a frequency of 100 Hz. The method derives its name from the author - French physicist, physiologist and physician Jacques D'Arsonval.


Apparatus for local darsonvalization Crown (3 electrodes).


Проведення процедури дарсонвалізації.

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electric and magnetic medical equipment. characteristics of electric current. amperage is determined...

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