If you were a kid before the age of smartphones, you probably played with a whirligig at least once. The design for this simple toy, which will spin twine threaded through a button at rapid speeds with only a gentle pull, inspired Stanford University researchers to create a cheap and effective medical tool for countries in need. The “paperfuge” is, quite literally, a centrifuge made out of paper. The human-powered device can separate blood in just 90 seconds and costs only $.20 to make.
There are still many parts of the world without access to the medical technology necessary to properly diagnose and treat disease. Stanford bioengineers hope to change that by providing a cost effective centrifuge to affected regions so medical professionals can detect deadly diseases, such as malaria, HIV, African sleeping sickness and tuberculosis. With the paperfuge, there is no need for electricity, as it is powered by human touch.
The engineers behind the design say the device can spin at speeds up to 125,000 rpm. The paperfuge can also exert centrifugal forces of 30,000 Gs and separate blood in just a minute and a half. “To the best of my knowledge, it’s the fastest spinning object driven by human power,” said Manu Prakash, a Stanford bioengineering assistant professor. Prakash’s lab is also responsible for creating a “foldscope” miscroscopy instrument that costs lest than one dollar to produce and a tiny chemistry kit inspired by children’s music boxes.
Images via Youtube (screenshot)