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I don't know why it would be any more dangerous than a typical centrifuge. Samples are in a vial, and that vial is what is responsible for containing the sample

I don't know why it would be any more dangerous than a typical centrifuge. Samples are in a vial, and that vial is what is responsible for containing the sample while you spin the samples. Having been around conventional centrifuges that have been destroyed due to improper balance, I assure you that any way you can imagine infected blood being distributed by the paper model would be 10x worse with a normal centrifuge. At least with this method, the motor has a brain and will stop as soon as things start going south. A lot of centrifuges are just controlled by a potentiometer. You couldn't pay me enough to to get close enough to turn one of those off while it is self-destructing. The amount of energy involved is enormous. Someone blew up a (rather inexpensive) medical centrifuge at my school when they balanced some non-water liquid with water. It was a huge mess. Centrifuges are basically designed to contain the most dangerous bits when they explode. They don't keep your error from spraying all over the room.

bluetwo 10y ago
You are comparing when things go wrong with a centrifuge to every single use of this device. How would you contain the microscopic airborne particles?
- DanBC 10y ago
  >> Samples are in a vial
  - Declanomous 10y ago
    In re-reading my comment, I realized it isn't clear that normal centrifuges use vials to contain the sample as well. Regardless, having spent thousands of hours in a lab, I think the traditional lab centrifuge is probably more dangerous.
- ptero 10y ago
  I suspect for most diseases break the centrifuge (and vial) would not drastically raise the risk for the bystanders -- we have plenty of microscopic airborne particles with all sorts of bacteria around us already, especially in cities. And I think malaria would not be contagious at all this way. It could be different for specifically engineered bio-weapon, but IMO the benefits of better detection far outweigh the risks, especially in the developing world.
Florin_Andrei 10y ago
Eh, both of you are right. Yes, a full-blown centrifuge could be made safer (put a shield around it, yadda-yadda). But if the paper device is made safe enough, I don't see why it should not be used when there are no better options. And it appears that it could be made safe enough.
lb1lf 10y ago
True story: The company I work for make some pretty hefty winches for offshore use. Think ROVs, subsea oil installation, salvage &c. Years ago, one of our customers had ignored a number of increasingly strongly worded safety bulletins, the end result being that just as they were going to hoist their megabuck ROV back aboard, the winch motors stopped and - for an encore - it turned out they hadn't tested the brake in ages, either - so it was incapable of halting the winch. Now, the ROV itself would very gently drift towards the bottom. Too bad the umbilical cord between it and the winch weighs several kilos per meter. The initial yank as the ROV freefell to the sea surface and the inertia of the drum ensured enough cable was paid out for the weight of it to keep the winch going faster and faster. Basically you had a very large loop with the ROV at one end, the winch at another. This drum was designed for some 30rpm or so at the maximum design speed. Based on a video from a surveillance camera, we found the drum did close to 200 rpm as a few tons of cable pulled at it. At this point, thinking the brakes must have been stuck disengaged, some brave soul with poor judgment and an axe appears, chopping off the hydraulic hoses to the brake. Lucky for him, the brakes weren't able to stop the thing anyway - otherwise, he would have found out if the designers had made the frame sturdy enough to remain intact during the retardation which would have followed. This brave soul then realises that the game will be up in a few moments' time anyway - when the drum runs out of cable, at which point being anywhere near the winch will be very bad for you. He runs like mad, disappear from the frame and then, seconds later - kerrrr-whaaang as the umbilical is ripped from the drum, the drum is torn from the frame and it all disappears into the large, blue waste disposal. That led to a quite interesting post mortem. They found assorted bits and pieces of the winch all over the deck. Somewhat off topic, but disintegrating centrifuges got me started...
- Declanomous 10y ago
  That story makes exploding $100k centrifuges sound like a bargin.
- DanBC 10y ago
  There are some videos on youtube of anchors dropping too fast: https://www.youtube.com/watch?v=hvrgFPcPXfo https://www.youtube.com/watch?v=hvrgFPcPXfo https://www.youtube.com/watch?v=RAcfaMDcY68 https://www.youtube.com/watch?v=RAcfaMDcY68 https://www.youtube.com/watch?v=b7pRfix_sNg https://www.youtube.com/watch?v=b7pRfix_sNg It's pretty scary. (Someone else posted one of these links originally, I'll try to find it)

bluetwo 10y ago

You are comparing when things go wrong with a centrifuge to every single use of this device. How would you contain the microscopic airborne particles?

DanBC 10y ago
>> Samples are in a vial
- Declanomous 10y ago
  In re-reading my comment, I realized it isn't clear that normal centrifuges use vials to contain the sample as well. Regardless, having spent thousands of hours in a lab, I think the traditional lab centrifuge is probably more dangerous.
ptero 10y ago
I suspect for most diseases break the centrifuge (and vial) would not drastically raise the risk for the bystanders -- we have plenty of microscopic airborne particles with all sorts of bacteria around us already, especially in cities. And I think malaria would not be contagious at all this way. It could be different for specifically engineered bio-weapon, but IMO the benefits of better detection far outweigh the risks, especially in the developing world.

Florin_Andrei 10y ago

Eh, both of you are right. Yes, a full-blown centrifuge could be made safer (put a shield around it, yadda-yadda). But if the paper device is made safe enough, I don't see why it should not be used when there are no better options. And it appears that it could be made safe enough.

lb1lf 10y ago

True story: The company I work for make some pretty hefty winches for offshore use. Think ROVs, subsea oil installation, salvage &c. Years ago, one of our customers had ignored a number of increasingly strongly worded safety bulletins, the end result being that just as they were going to hoist their megabuck ROV back aboard, the winch motors stopped and - for an encore - it turned out they hadn't tested the brake in ages, either - so it was incapable of halting the winch. Now, the ROV itself would very gently drift towards the bottom. Too bad the umbilical cord between it and the winch weighs several kilos per meter. The initial yank as the ROV freefell to the sea surface and the inertia of the drum ensured enough cable was paid out for the weight of it to keep the winch going faster and faster. Basically you had a very large loop with the ROV at one end, the winch at another. This drum was designed for some 30rpm or so at the maximum design speed. Based on a video from a surveillance camera, we found the drum did close to 200 rpm as a few tons of cable pulled at it. At this point, thinking the brakes must have been stuck disengaged, some brave soul with poor judgment and an axe appears, chopping off the hydraulic hoses to the brake. Lucky for him, the brakes weren't able to stop the thing anyway - otherwise, he would have found out if the designers had made the frame sturdy enough to remain intact during the retardation which would have followed. This brave soul then realises that the game will be up in a few moments' time anyway - when the drum runs out of cable, at which point being anywhere near the winch will be very bad for you. He runs like mad, disappear from the frame and then, seconds later - kerrrr-whaaang as the umbilical is ripped from the drum, the drum is torn from the frame and it all disappears into the large, blue waste disposal. That led to a quite interesting post mortem. They found assorted bits and pieces of the winch all over the deck. Somewhat off topic, but disintegrating centrifuges got me started...

Declanomous 10y ago
That story makes exploding $100k centrifuges sound like a bargin.
DanBC 10y ago
There are some videos on youtube of anchors dropping too fast: https://www.youtube.com/watch?v=hvrgFPcPXfo https://www.youtube.com/watch?v=hvrgFPcPXfo https://www.youtube.com/watch?v=RAcfaMDcY68 https://www.youtube.com/watch?v=RAcfaMDcY68 https://www.youtube.com/watch?v=b7pRfix_sNg https://www.youtube.com/watch?v=b7pRfix_sNg It's pretty scary. (Someone else posted one of these links originally, I'll try to find it)