Galvani currents basics for Physiotherapist

1. Galvanic CurrentsGalvanic Currents
Dr.Deepak Anap,Asso. Professor
COPT,PDVVPF
deepak.anap@hotmail.com
Galvanic Currents - Dr.Deepak

2. Objectives
• History
• Introduction to DC
• Graphical Representation
• Interrupted DC
• Wave form Characteristics – Duration and Frequency
• IDC Waveforms
Galvanic Currents - Dr.Deepak

3. History
• Luigi Galvani ,an Italian Physiologist-on whose
honor galvanic current is named.
• First to show that when electric current is passed
through the legs of a frog, it twitched, way back
in 1791.
Galvanic Currents - Dr.Deepak

4. Galvanic Currents - Dr.Deepak

5. Definition
• In DC, electrical current flows in one constant
direction, as opposed to AC, in which the current
constantly reverses direction.
• Ex of a device that provides DC : battery.
• DC ultimately supplies power to nearly all
electronic devices (even if these devices require a
component to convert AC current into DC
current).
Galvanic Currents - Dr.Deepak

6. DC Vs AC
Galvanic Currents - Dr.Deepak

7. Galvanic Currents - Dr.Deepak

8. Modifications of DC
• Interruption – most usual modification of DC
• Interrupted DC
• Current flow commencing & ceasing at
regular intervals
Galvanic Currents - Dr.Deepak

9. Wave form Characteristics
• Duration
• Duration 100,300,600ms used for Treatment
with IDC
Galvanic Currents - Dr.Deepak
Duration

10. • Frequency: No. of impulses/Sec
• Depends on duration of Interval between the
impulses
• Duration α 1/Frequency
Galvanic Currents - Dr.Deepak
Duration of interval

11. Galvanic Currents - Dr.Deepak

12. IDC waveforms
Galvanic Currents - Dr.Deepak
DC
Rectangular IDC
Current rises suddenly, constantly maintained for the
duration of the stimulus then turned off abruptly

13. Triangular Pulses
• Traingular: has an equal phase of slow rise
and then slow falling off in intensity
Galvanic Currents - Dr.Deepak

14. Trapezoidal Pulses
Current rises slowly, plateaus for a short
period then gradually declines
Galvanic Currents - Dr.Deepak

15. Saw Tooth Pulses
current is gradually raised then turned off
abruptly
Galvanic Currents - Dr.Deepak

16. Depolarised Wave Form
• Current of low intensity flows in reverse
direction
• Chemical formation because of DC is reduced
Galvanic Currents - Dr.Deepak

17. Thank you