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electrode for spinal cord stimulation
Posted 24.07.2016, 08:15 GMT-4 Version 5.0 4 Replies
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Hi,
i'm using Comsol 5.0. and i am new.
I need to make a model of two electrodes (cathode and anode) resting on a series of biological tissue (dura mater, cerebrospinal fluid and white matter, of which I know the parameters). I have to stimulate the electrode with a rectangular voltage pulse and I would see how it propagates the electric field, temperatures and current density in biological tissues.
1) Which type of "study" should I use? (Stationary .. .... transitional ...frequency ...?)
2) What "physical" should I use? (I tried it with electric currents and heat transfer in solids but using these I did not understand what kind of "study" should I use)
3) how can I apply the rectangular pulse function to the electrode voltage?
thank you!!!
i'm using Comsol 5.0. and i am new.
I need to make a model of two electrodes (cathode and anode) resting on a series of biological tissue (dura mater, cerebrospinal fluid and white matter, of which I know the parameters). I have to stimulate the electrode with a rectangular voltage pulse and I would see how it propagates the electric field, temperatures and current density in biological tissues.
1) Which type of "study" should I use? (Stationary .. .... transitional ...frequency ...?)
2) What "physical" should I use? (I tried it with electric currents and heat transfer in solids but using these I did not understand what kind of "study" should I use)
3) how can I apply the rectangular pulse function to the electrode voltage?
thank you!!!
4 Replies Last Post 27.07.2016, 11:22 GMT-4
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Posted:
8 years ago
How short is your pulse?
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Posted:
8 years ago
It is 500 micro seconds
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Posted:
8 years ago
You used the word "propagate". Electromagnetics waves "propagate" at the speed of light. If your pulse is a very, very slow 500 us, the electic and magnetic fields will "propagate" very fast (even in tissue) and you could simply use a stationary study to see the steady state value of the fields when the pulse is on. Just use the on value of the pulse as your voltage.
On the other hand, if you really do want to investigate step-function wave propagation through tissue, indeed you'd want the time dependant study. Again, there's no need to simulate over the forever length of a 500 us pluse. You'd probably want to look at the first few hundred picoseconds.
On the other hand, if you really do want to investigate step-function wave propagation through tissue, indeed you'd want the time dependant study. Again, there's no need to simulate over the forever length of a 500 us pluse. You'd probably want to look at the first few hundred picoseconds.
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Posted:
8 years ago
ok, thank you!!
anyway...if i apply a voltage of 10 volt (typical of scs in commerce).. I've noticed that the temperature at the interface electrode-first biological tissue is too high! I think all the parameters are correct...do you think that i have to add some particular condition (like a boundary condition......?)
anyway...if i apply a voltage of 10 volt (typical of scs in commerce).. I've noticed that the temperature at the interface electrode-first biological tissue is too high! I think all the parameters are correct...do you think that i have to add some particular condition (like a boundary condition......?)