I'm sure this is old news, and while it isn't exactly available to the general populace...
Has anybody considered looking into reverse engineering an arterial cuff?
They're still in prototype form, but the patent hasn't actually been set in stone yet.
I realize this exists more in the realm of fantasy for your day to day transhumanist, and unless some of you people are actual surgeons I would never recommend trying to implant yourself with something that involves working that close to your arteries; still there must be a way to take this idea which is now a proven concept and expand upon it.
Also hi I'm new, so don't tear into me if this is stupid.
Basically it is an internal power source invented by the VA that wraps around the artery and the expansion/contraction of said artery generates power, which in turn can be directed to implanted devices.
tl;dr your heart beat powers your implants
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I do remember discussing this at some point but I can't seem to find the thread now. It looks like a pretty cool idea. Power has been a major hurdle of ours. @ThomasEgi has done a lot in that area, and I think he was underwhelmed by the device's power output. Maybe I'm confusing it with a discussion about a glucose fuel-cell.
this thing here is a bit more interesting. during a heartbeat , bloodpressure does variate. for a normal humand and hearbeat around 30 torr. or almost 4000pa ot n/m²
having a big blood vessel , like your neck or the upper arm. let's take a random number of 5mm diameter here, and a clamp that is 10mm wide that'll already put a bit more than half a newton in place. depending on how much that thing can move, for random math take half a milimeter movement. that would already give a bit under half a millijoule per heartbeat.
since that thing should scale rather well. 0.5mW sound like a reasonable dimension (very rough estimation). that would already be enough to power a microcontroller and a realtime clockmodule with enough spare power to do some other ligh tasks.
might be worth to investigate blood-vessel clamps. piezos are rather easy to get and can easily output high voltages which can directly be used to charge capacitors, so they are easy. so. a bit of a smart mechanics with pressure-limit would be all that's needed.
drawback: only works for big, elastic blood vessles. so you need to be pretty close to the heart. neck, shoulders, upper legs maybe.