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Nuclear-Powered Cardiac Pacemakers

osrp.lanl.gov

41–50 of 277 posts

Re: Nuclear-Powered Cardiac Pacemakers

#41

I had no idea nuclear power had been miniaturized to this extent, wow.

AIUI there's not really anything to miniaturise beyond the rest of the pacemaker (i.e. ignoring how it's powered) - there's no 'control' or addition of material as in a big nuclear power station, it's 'just' a decaying radioactive material -> heat -> electricity (the inverse of Peltier effect heating, and presumably just as inefficient (~30%?)).

Re: Nuclear-Powered Cardiac Pacemakers

#43
post #3

Wonder how I slided into the world of Fallout? WTF!?! We have plutonium powered pacemakers? http://large.stanford.edu/courses/2015/ph241/degraw2/ Ah, okay we had . > Despite the often longer life-expectancies, nuclear pacemakers quickly became a part of the past when lithium batteries were developed. Not only did the technology improve, allowing for lighter, smaller, and programmable pacemakers, but doctors began to…

> allowing for doctors to check in on their patients and replace either the batteries or the pacemakers themselves I cynically read this as "we needed to get more money out of these patients"

A friend had one of these units that extended his life for over a decade. He had it upgraded at least once, and the programing updated several times, and noted improvements each time (although he never got the one feature he really wanted [0]). So active maintenance is definitely not spurious or mercenary but is genuinely useful.

[0] When the pacemaker detected a problematic arrhythmia it would give a couple of defibrillation shocks just like the paddles but right on the heart muscle. He said this felt like getting kicked in the chest by a horse and came completely out of the blue with zero warning. So it could be quite disruptive. He wanted a feature where it would tingle or beep or something just a few seconds ahead of time so he could mentally prepare; apparently the second one that was expected was a lot less traumatic. Anyway, the docs thought it was a good idea, and passed it up, but it never happened before he passed.

Re: Nuclear-Powered Cardiac Pacemakers

#44
post #7
post #5

Just got me thinking: What would it take for us to get to a point where there are small, safe nuclear powered "batteries", that can supply enough electricity for a building.

It would take some kind of complete revolution. It’s not happening. These batteries have very poor power density and are very inefficient. The advantages of nuclear-powered batteries are: - They generate power over a long time, decades, - They generate some heat. They don’t generate much power. If you have a building, you would definitely think of a nuclear RTG as a “very shitty battery”, and that’s even if you don’t…

Thanks for the insights. I was thinking if we can make nuclear power generation small, it can avoid the stigma associated with big nuclear power plants. At that point it might become a viable source of energy to replace fossil fuels.

Re: Nuclear-Powered Cardiac Pacemakers

#45

Earlier quoted context omitted.

> allowing for doctors to check in on their patients and replace either the batteries or the pacemakers themselves I cynically read this as "we needed to get more money out of these patients"

There’s not a single cardiac surgeon in the world who thinks he’s gonna get rich with once-every-10-years follow up appointments. We produce enough new patients to keep them all sufficiently busy.

Looked at my scales this morning, boy are you right.

Re: Nuclear-Powered Cardiac Pacemakers

#46

Could I use it to power my iPhone? Frankly I’m fed up with the need for charging.

It would take about 50,000 hours (5.7 years) to charge a 10 Wh iPhone. A solar cell on the back of the iphone would take roughly a full sunny day to charge an iPhone, with ~2 watts peak output.

Re: Nuclear-Powered Cardiac Pacemakers

#48
post #5

Just got me thinking: What would it take for us to get to a point where there are small, safe nuclear powered "batteries", that can supply enough electricity for a building.

RTGs have been around since the 50's and 60's: https://en.wikipedia.org/wiki/Radioisotope_thermoelectric_ge... For example Russia used them to power lighthouses in super remote parts of their coast. Space probes, mars rovers, etc. use them too.

Yes, there's a Russian movie with a guy that is guarding a weather station in the North and playing games all day. He somehow gets into a conflict with his supervisor, dissasembles a RTG beacon and uses the Strontium 90 to poison his supervisor's dried fish supply. They both get irradiated and the military cleans up the mess.

https://m.imdb.com/title/tt1588875/

Only the Soviets were daft enough to build RTGs using Strontium 90.

Re: Nuclear-Powered Cardiac Pacemakers

#49
post #25
post #17

Tragically relevant story to accompany this article: the Goiânia accident. https://en.wikipedia.org/wiki/Goi%C3%A2nia_accident

Quoted post unavailable.

Right, they are so poor that they are using their what little knowledge they have to scavenge an abandoned building for scrap they can sell to feed themselves and their children.

If you had never been taught about radiation, you wouldn't know what to do about it either. It is not like radioactive materials are a common everyday occurrence for everyone.

What is wrong with you that you cannot see that they are also humans just like us, and were born into horrible circumstances that they never got the education to learn about this, through no fault of their own whatsoever?

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