Em 17/02/2014 23:18, Peter Terren escreveu:
A quote from Antonio Carlos M. de Queiroz in a recent post in regard to contact with Tesla coil sparks.Considering the situations where a defibrillator is used, subsequent eventual pain is not a problem. And the device applies a single pulse."A common effect is pain at the joints, because there the resistance is higher and most damage occurs."Is that really true? To me the explanation is dubious. Consider these facts:- Body resistance between two chest pads for defibrillation is around 50 ohms. (This is a machine printout at defibrillation - personal best skin prep of mine was 48 ohms)
- A TENS machine is an electrostimulating device that uses a current from 1 to 100mA to treat pain. This is a mainstream machine used by physical therapists to treat pain (including joints) - not to cause it.www.kau.edu.sa/Files/0053044/Subjects/9b-TENS.doc
A small Tesla coil can easily produce arcs with several amperes of current.
A Tesla coil and a classical electric scapel use essentially the same circuit. And the later obviously produces damage.- RF diathermy is used in surgery for cutting tissue. http://en.wikipedia.org/wiki/Diathermy
- Shortwave diathermy has been used for joint problems, with or without implanted metal hardware.http://www.ncbi.nlm.nih.gov/pubmed/17017272
Low current level.
I find nothing about joint pains after serious DC shock or lightning injuries. http://www.patient.co.uk/doctor/Electrical-Injuries-and-Lightning-Strikes.htmNowhere have I seen information about joint pains and current from DCthrough to 27mHz.I can find nothing that suggests that there is a higher resistance injoints. On the contrary, joint fluid is a conductive biological fluid andhas no impeding cell membranes.Consider the current from a tolerable Tesla coil spark that one uses forstunts. Is it really likely that significant tissue damage will occur acrossa 50 ohm body part. (excluding entry and exit points where current islocalized to a tiny point?Comments please (with references). Just like medical science, personalanecdote is not sufficient.PeterTesladownunder.com.About this I have just my personal anecdote. In the first time (and last) when I tried to draw an arc from a small Tesla coil to a finger I ended with a third degree burn in a spot and joint pain in the affected finger for weeks. In the last days I was doing measurements in a drsstc, and eventually drawing corona to the leads or a fluorescent lamp (the tube of a compact lamp) that I was holding in my left hand. Now I have joint pain in that hand. Not intense. I stayed close to the coil in operation for long time, and, possibly by coincidence, or not, got a severe and unusual back pain...
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