How Does Human Touch Activate Bioelectric Circuits?

  • Context: Medical 
  • Thread starter Thread starter mdjensen22
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Discussion Overview

The discussion revolves around the activation of circuits by "bioelectricity" in the context of a patent review. Participants explore the voltage and current that the human body can produce and sustain when touching a circuit, specifically excluding electrostatic discharge (ESD) considerations.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant questions the ability of the human body to produce any significant voltage or current to the outside world through touch, suggesting it would be zero unless dissimilar metal electrodes are involved.
  • Another participant explains that the body generates a membrane potential due to ion concentration differences, but this voltage is typically in the millivolt range and may not be harnessed externally.
  • A different viewpoint suggests that charge can be transferred when touching a charged conductor, even without a spark, although the amount of charge and current would be low.
  • It is noted that individuals are capacitively coupled to their environment, which allows for the conduction of low-frequency currents, but this is generally minimal and primarily relevant in medical device contexts.
  • One participant expresses skepticism about the term "bioelectricity," suggesting it may be more of a marketing term than a scientifically robust concept.

Areas of Agreement / Disagreement

Participants generally agree that the human body does not produce significant voltage or current for external activation of circuits, but there are differing opinions on the mechanisms of charge transfer and the relevance of the term "bioelectricity."

Contextual Notes

Limitations include the potential misunderstanding of "bioelectricity" as a concept, the low voltage levels discussed, and the specific conditions under which charge transfer might occur.

Who May Find This Useful

This discussion may be of interest to those involved in electrical engineering, medical device design, and patent review processes related to bioelectric phenomena.

mdjensen22
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I was asked to review a patent in which a company is claiming their circuit is activated by "bioelectricity".

The circuit appears to be a basic 'line-hum' touch circuit, but just to make sure I was hoping somebody could point me in the right direction.

How much, if any, voltage and/or current is the human body able to produce and sustain to the outside world (transferred through a finger touch)? To clarify, I don't mean in regards to ESD.
 
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Unless you are putting two dissimilar metal electrodes into the body - I would have said zero
 
The body uses different concentrations of ions inside and outside of the cell to create a membrane potential. From what I know, this voltage cannot really be harnessed to the outside world. Even if it can, the voltages are on the order of mV's. I'm no electrical engineer, and my knowledge of electricity is very limited, but that is pretty darn low voltage.

Here's the wikipedia article, I haven't read it but it looks pretty thorough at a glance. http://en.wikipedia.org/wiki/Membrane_potential
 
there are a couple of ways i can think of right away. one is related to the ESD you mentioned. that is, if someone touches a charged conductor, some of that charge would be transferred to the person. you don't need an actual spark (discharge) to transfer charge like this, just contact. the amount of charge, and therefore current, transferred could be very low.

another thing is that we are all capacitively-coupled to the ground and line voltage around us. it's just a few picofarads, and that means that the 60Hz current we are conducting all the time is pretty low. it really only becomes an issue in medical device settings where invasive probes are involved.

you'll probably get a better answer in the electrical engineering subforum, or maybe seek consulting from a medical device engineer.

but yeah, "bioelectricity" sounds like more of a marketing term here.
 
Thanks guys - you've pretty much confirmed everything I thought.
 

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