71–80 of 135 posts
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What standard exactly, for a stethoscope? I know nothing of this, but it looks like stethoscopes are Class 1 medical devices with 501(k) exemption, and fall under the "Good manufacturing practices" guidelines of Quality System Regulation (21 CFR 820), but that seems pretty squishy.
CFR 21 being labeled squishy is a first for me.
Hmmm. Looking at: https://journals.plos.org/plosone/article/figure?id=10.1371/... I'm not sure I believe the graphs. For example, here's another frequency response chart of some stethoscopes: https://www.researchgate.net/figure/a-Frequency-response-of-... How is it that professional stethoscopes can be that different, and yet this 3D printed one can match a gold-standard one almost exactly? From what I can tell there…
It's a bit of a head scratcher. It would require abject incompetence on the part of jellybean stephoscope manufactorers for this to make sense. On the other hand the reason Litmann stephoscopes are expensive is target market (doctors), build quality and amortization of cost over probably a decade of use. Stephoscopes are a metanym for doctor, and doctors don't want cheap stephoscopes. It reminds me of the product to…
However I am comfortable with my Littmann.
Littmann's last for 20 plus years.
Here is an interview with one of the researchers behind this project: https://logicmag.io/bodies/tarek-loubani-on-3d-printing-in-g... It explains the project and its motivations. It's been a while since I read it (2019), but at the time I found it really fascinating and inspiring.
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How long do they last? Looks like pretty solid piece of equipment, but are they damaged easily or simply clap out after few years?
> How long do they last? Looks like pretty solid piece of equipment, but are they damaged easily or simply clap out after few years? They last forever. Why would they break? This is like asking how long floor speakers last.
The adhesives can age. Foam surrounds can disintegrate. (Ask a Bose 901 owner about foam rot.)
They also can also die from use, and abuse. And finger-poking. And environmental conditions like moisture and UV light.
I know enough enough about old speakers to know that lasting forever isn't one of their usual traits.
Are stethoscopes really as bad as that?
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How long do they last? Looks like pretty solid piece of equipment, but are they damaged easily or simply clap out after few years?
> How long do they last? Looks like pretty solid piece of equipment, but are they damaged easily or simply clap out after few years? They last forever. Why would they break? This is like asking how long floor speakers last.
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It is somewhat of a critical tool, so you don't wanna be checked by a doctor who made their own stethoscope or got one for 3 USD on AliExpress.
It’s funny, most physicians agree that the cheap disposable stethoscopes in isolation rooms are the best, mostly because they are so loud it’s difficult miss anything with them. However, I am not a cardiologist so they may have a different opinion.
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How long do they last? Looks like pretty solid piece of equipment, but are they damaged easily or simply clap out after few years?
> How long do they last? Looks like pretty solid piece of equipment, but are they damaged easily or simply clap out after few years? They last forever. Why would they break? This is like asking how long floor speakers last.
Earlier quoted context omitted.
How long do they last? Looks like pretty solid piece of equipment, but are they damaged easily or simply clap out after few years?
> How long do they last? Looks like pretty solid piece of equipment, but are they damaged easily or simply clap out after few years? They last forever. Why would they break? This is like asking how long floor speakers last.
Littmann sells repair kits.