LogFAQs > #948527339

Mead posted...

its pretty new stuff, most pacemakers for now are still using lithium batteries that have to be replaced every 10-15 years
it makes sense that a pacemaker could be recharged by the heart though, cause your heart has an electrical charge run through it every beat
https://www.designnews.com/electronics-test/tiny-device-harvests-energy-heart

Hm, it's still a theoretical thing and not legal anywhere for a bit, but I'll just read that paper and get the hard data.
Looks like they're getting +- .15V and -10 to + 8nA at about 2Hz.

According to them (which I do trust)

such as 0.3 W for cardiac activity sensing, [2] 10100 W for pacemakers, [3,4] 1002000 W for coch-lear implant, [5] and 110 mW for neural recording[6]

So you're looking at low-frequency power at a rate of 1.2nW.
It's still about a factor of 10 to 100 below the power that they need, not feasible, but, hey, who knows, this could be a good way of going about it.

Generally speaking, getting power out of mechanical systems is shitty and prone to breaking down, even the flexible stuff like was shown there, it's a better way of going about this, but, I don't think it's good.