How to Determine Voltage for Nerve Stimulation Using Monophasic Pulse?

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To determine the voltage needed for nerve stimulation using a monophasic pulse train, the impedance values obtained from sinusoidal current measurements must be analyzed. The current required for stimulation is 5mA, and the voltage can be calculated using the formula V=IR. The discussion highlights the importance of selecting the appropriate frequency from the impedance data that corresponds to the 20 Hz frequency of the monophasic pulse. Concerns are raised about the suitability of the electrode if the required voltage is excessively high, and the potential impact of polarization at the electrode interface on impedance is noted. The choice of monophasic stimulation is questioned in relation to its standard use in EMG applications.
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I have impedance values for an electrode (used for nerve stimulation) over a wide frequency range using sinusoidal current. Now I have to calculate how much voltage I need to stimulate the electrode at a current of 5mA, using the equation (V=IR). I have to use monophasic pulse train of 5 to 10 pulses, pulse width = 200 micro seconds, inter pulse interval = 5 milli sec and frequency= 20 Hz.
I want to know at what frequency I should take the impedance from the impedance data (obtained using sinusoidal current) corresponding to the frequency of 20 Hz (monophasic pulse train)?
 
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tahsid said:
I have impedance values for an electrode (used for nerve stimulation) over a wide frequency range using sinusoidal current. Now I have to calculate how much voltage I need to stimulate the electrode at a current of 5mA, using the equation (V=IR). I have to use monophasic pulse train of 5 to 10 pulses, pulse width = 200 micro seconds, inter pulse interval = 5 milli sec and frequency= 20 Hz.
I want to know at what frequency I should take the impedance from the impedance data (obtained using sinusoidal current) corresponding to the frequency of 20 Hz (monophasic pulse train)?

Welcome to the PF.

First, is this electrode meant to be used in a human biomedical application? If so, are you designing your circuitry according to the UL 544 safety standard?

Can you please describe the application? What does the electrode get placed on? Depending on the surface, you may not be able to infer monophasic impedance from a balanced AC impedance sweep...
 
Yes, the electrode is meant for biomedical application. the electrode is placed near the nerve.
I have done the impedance measurement of the electrode now I want to calculate how much voltage is required for stimulating this electrode using monophasic current. if the required voltage is too high than this electrode is not suitable.
 
tahsid said:
Yes, the electrode is meant for biomedical application. the electrode is placed near the nerve.
I have done the impedance measurement of the electrode now I want to calculate how much voltage is required for stimulating this electrode using monophasic current. if the required voltage is too high than this electrode is not suitable.

For monophasic current, won't polarization at the interface modify the impedance? Why are you using monophasic stimulation? Is that standard for EMG applications (I don't know)?
 

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