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Re: Why cant we feel RF burns?
Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx>
At 12:15 AM 9/18/2005, you wrote:
I quote this from a website I came across:
Burns: Due to the high frequencies involved, Tesla coils can cause
severe burns without the sensation of pain. These burns are
typically very deep and need long term medical attention.
Sounds like something I wrote :-)
Does it mean that RF (because of the high frequencies), can induce
the current to flow along the blood vessels without flowing along
the membranes. As such, we wont be able to feel the pain because the
nerve cells, etc are located along the membranes and not inside any
No. The electrical "Skin Depth" in humans is about 1 ot 2 meters at
Tesla coil frequencies. Currents flow along the path of least
resistance (I may have said that backwards in another post..). The
AC currents do no allow the sodium in the nerves to become polarized
to create the chemicals that cause pain or something like that. It
takes a fraction of a second for current to be registered as pain but
the AC currents basically turn the nerves off... I am not a doctor,
but it is something like that.
Is it only RF current can be able to flow in the inner parts of the
body without flowing along the membranes (exterior) first?
The dry outer skin is pretty none conductive, but the voltages we
deal with are very high. The current simply flows alone the lowest
resistance paths. If the current is high enough, you can actually
get a plasma "arc" thorough you. that is "bad"...
If so, how is that possible? Do we just take it for granted that RF
current has this special property of allowing the current to flow in
the inner parts w/o any flowing along the exterior?
In or case, the currents flow much like DC currents. But the AC
nature of the currents prevents the nerves from reporting pain.