rdb
Comments
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$250 is not a reasonable price for a tDCS device. I'm guessing it's so expensive because of all the non-essential extras (bluetooth communication, iPhone app, etc.)
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I don't know what a "350 F" is (please use standard units) but I think that the temperature you need depends on the method that you use (compression molding, heatshrink tubing, sintering, etc.) Also, perhaps you can insulate the magnet from any high temperature long enough using another material. Keep in mind that you…
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For some reason, the post box is very stretched. It's very annoying. I'm assuming this was an unintentional regression? Also, does anyone else get the text "icon" at the top of every page? It appears before any HTML code, so I'm guessing that someone modified the PHP code? Has the server been compromised or is this once…
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Yes, there is, but it's better to close a thread instead. I've just closed this one.
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There is PTFE shrink tubing. I believe that ThomasEgi had some ideas on using that to encapsulate an implant.
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I don't think it can be too shallow unless it's rejecting. Most nerve endings are closest to the skin, so you'll have the best sensation there.
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No, you raise some good points, and it's good to be open about apparent shortcomings so that the best design can be reached. (To think I had almost rejected your application for being too generic...) I also concur with your suggested improvements to the GoFlow design, although some of my concerns with it still stand. About…
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I would guess that most of the nerves in the fingertips are near the surface and that you should try to tuck it right behind your skin.
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For the record, you cannot separate a north pole from the south pole of a magnet. If you were to cut a magnet in half, each half would have its own north and south pole. If you combine two magnets together by putting one's south pole against the other's north pole, you really get a giant magnet with one north and one south…
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No scientific research has ever been able to demonstrate an effect of static magnetic fields on the body, nor is magnetic healing based on actual science. And if there were studies backing this up, doctors would be jumping on it as a viable treatment, not losing their jobs. I should add that certain substances in the body…
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This has come up many times:http://discuss.biohack.me/discussion/253/powering-devices-within-the-body/p1
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That's a real shame. Do you think it's the PTFE coating that's to blame or the relatively weak Alnico core? I've been having a lot of difficulty sourcing stronger PTFE-coated magnets, which is a shame, because of the advantages of PTFE.
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Yeah, a few of the datasheets I've come across use separate chips and coils for high-frequency communication. Is there a particular reason you're interested in high-frequency solutions? It seems to me that that would be a bit more challenging to implement. When looking for chips, I would suggest searching sites like TI and…
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Thomas and I have been looking into some chips by Atmel and TI that are designed for this purpose, and have charging capabilities built-in. The one we've currently sampled (though have yet to play with) is the TMS37157, which can be hooked up to a coil, a microcontroller and a battery and handles charging inside the chip.…
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No, the charge density for capacitors is much lower than for batteries, and as such they are even less feasible for powering electromagnets, or anything that's supposed to be implant-size really. I would still suggest avoiding electromagnets in your designs.
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When did you implant your first magnet? Keep in mind that it takes quite a long time for the effect to become more noticeable. Many people don't notice much at first, presumably because the tissue around it hasn't fully recovered yet.
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You need a coil to induce a magnetic field using an electrical current, you cannot do this by simply running a current through a magnet (even if you tried, it'd just conduct through the plating). What would the goal be of manipulating the magnetic fields? Do you mean you want to be able to turn the magnet on and off?
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Could I ask you what the point is of having it under your skin? It seems to me that you're just using your body as a handbag this way, as Thomas pointed out. I don't see any benefit to having such a device implanted that could possibly come close to outweighing the large hurdles and risks. If I wanted to become a mobile…
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I'm sorry, but I've been ill during the past few months and it's not likely that I will recover until a few more months, so I can make no promises whatsoever.
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50 mW is an awful lot of power for subdermal implants, probably in the infeasible range. Generally, expect to target a thousandth of that. Generally, the tricky part about GPS is that it consumes so much power, the modules are rather large, and the skin likes to absorb the high frequency signals that are already so faint…
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Plating with gold is fairly easy to do, it's not difficult to get hold of some immersion gold solutions. The problem with hard, thin, metal coatings (especially DIY ones) is that they can come off rather easily when subject to physical trauma. I've heard that sugru breaks down after a year or so. I'm not sure about hot…
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For the record, sugru isn't really a suitable bioproofing material. It breaks down eventually.
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MRIs are not a huge problem as they can shield off your finger just like they do with embedded metal shrapnel.
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@wrobert: You can just use the direct link: http://rdb.name/tdcs5.png @rollsroyce: Right, that's what I meant. I believe the AgCl electrodes are used with electrode gel, but I'm not certain. Check out this paper:http://bme.ccny.cuny.edu/faculty/mbikson/MinhasBiksonHDelectrodes2010.pdf
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I'm not sure about that either, but I imagine that just tying together all of the anodes (or cathodes) should work.
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As far as I know, Ag/AgCl disc electrodes as used in EEG/EKG are optimal for HD-tDCS, and they are widely available online.
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If you have to have a big-ass external setup, then there's really no point in implanting magnets at all. If you're wearing a vest, then you can get the same effect by just placing vibrators on your skin, or perhaps even something better; you'll have greater control over the sensation and you can avoid the risky procedure.…
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I was talking about this group buy.
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I have no clue. There was that recent group buy with parylene-coated neodymium bars, but the coating is very thin (it scrapes off easily), so I won't be trying them out.
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Mainly because I haven't found a reliable source for high-grade cylindrical neodymium magnets with reliable PTFE coating yet. I'm interested in PTFE because the smooth surface should make it easy to inject and remove, and the parylene ones I've seen so far have had a very thin coating (I don't think I'll trust a 30 micron…