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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2017-01-31T00:00:00-05:00" class="date-display-single">January 31, 2017</span></p><div class='syndicate'><h1>A low-cost, hand-powered paper centrifuge</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>Researchers developed a lightweight, ultralow-cost centrifuge based on an ancient toy. The “paperfuge” can separate blood components in less than 2 minutes.</li>
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<li>The hand-powered device highlights how creative design can be used to make diagnostic tools for use in global settings with limited resources.</li>
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<picture title="Paper centrifuge">
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<!--[if IE 9]><video style="display: none;"><![endif]-->
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2017/20170128-paperfuge.jpg?itok=UQ2uGvK5&timestamp=1485807382 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2017/20170128-paperfuge.jpg?itok=mCSu7Eyh&timestamp=1485807382 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2017/20170128-paperfuge.jpg?itok=cNzYfhmr&timestamp=1485807382 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2017/20170128-paperfuge.jpg?itok=DRsXOGl5&timestamp=1485807382 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2017/20170128-paperfuge.jpg?itok=xMlFpQ3r&timestamp=1485807382 1x" media="screen and (min-width: 0)" />
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<!--[if IE 9]></video><![endif]-->
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2017/20170128-paperfuge.jpg?itok=mCSu7Eyh&timestamp=1485807382" alt="Paper centrifuge" title="Paper centrifuge" />
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</picture><span class="caption">The paper centrifuge. Blood samples are placed in sealed drinking straws and the 2 paper disks are attached together with Velcro to serve as a cover. </span><span class="credit">Prakash lab, Nat. Biomed. Eng.</span></div>
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</div><p>Rapid and accurate diagnosis of many diseases requires separating a blood sample into several parts, including plasma and red blood cells. This is typically done by spinning the sample at an extremely fast rate in a device called a centrifuge. The high centrifugal force causes the fluid to form layers based on the density of the components. Unfortunately, this key piece of medical equipment is typically expensive, bulky, and requires electricity to work, making it impractical in many global settings. </p>
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<p>A team led by Dr. Manu Prakash at Stanford University set out to design a low-cost, portable, human<strong>-</strong>powered centrifuge that could be used in places that lack resources such as electricity. The research was funded in part by an NIH Director’s New Innovator Award and NIH’s National Center for Advancing Translational Sciences (NCATS). Results were published online in <em>Nature Biomedical Engineering </em>on January 10, 2017.</p>
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<p>The scientists were inspired by spinning toys invented before the industrial age, such as yo-yos and tops. They found that the whirligig—a toy in which a button or other circular disk is spun by pulling on strings that pass through its center—rotates at extremely high rates.</p>
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<iframe class="media-youtube-player" width="640" height="390" title="Stanford bioengineers develop a 20-cent, hand-powered centrifuge" src="https://www.youtube-nocookie.com/embed/pPePaKnYh2I?wmode=opaque&controls=0&rel=0&theme=light" name="Stanford bioengineers develop a 20-cent, hand-powered centrifuge" frameborder="0" allowfullscreen="" id="Stanford bioengineers develop a 20-cent, hand-powered centrifuge">Video of Stanford bioengineers develop a 20-cent, hand-powered centrifuge</iframe>
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</div> <!--MEDIA-WRAPPER-END-1--></div>
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<p>The team designed a whirligig, which they call a “paperfuge,” made with a paper disk and braided fishing line for the string. They analyzed the mechanics of the device, which consists of successive winding and unwinding phases. Based on their modeling, they optimized the components, including the disk radius and width, and the string radius and length. Using a high-speed camera, they showed that the paperfuge could reach speeds of 125,000 revolutions per minute (rpm) using only human power.</p>
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||
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||
<p>The researchers used drinking straws to hold tubes containing blood samples and found that the paperfuge could separate pure plasma from whole blood in less than 1.5 minutes of spinning. This separation provides a reading of hematocrit, which is used to diagnose anemia. With 15 minutes of spinning, they could separate out a layer known as the buffy coat. This layer is used for diagnosing conditions where a parasite is in the blood—such as malaria and African trypanosomiasis (sleeping sickness). The device weighed 2 grams and could be made for 20 cents.</p>
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<p>The scientists also made paperfuge-like devices from other materials, including plastic and 3-D printed polymers. Such devices could open opportunities for other types of diagnostic tests in resource-poor settings. They could be used for science education and field ecology as well.</p>
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<p>“There are more than a billion people around the world who have no infrastructure, no roads, no electricity. I realized that if we wanted to solve a critical problem like malaria diagnosis, we needed to design a human-powered centrifuge that costs less than a cup of coffee,” Prakash says.</p>
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<p>The team has tested the paperfuge in a community health setting in Madagascar and is now clinically validating the device.</p>
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<p>—by Carol Torgan, Ph.D.</p>
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</div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/smartphone-microscope-detects-nanoparticles-viruses" target="_top">Smartphone Microscope Detects Nanoparticles and Viruses</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/microchip-captures-clusters-circulating-tumor-cells" target="_top">Microchip Captures Clusters of Circulating Tumor Cells</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/3-d-gel-nanoparticle-device-detoxifies-blood" target="_top">3-D Gel-Nanoparticle Device Detoxifies Blood</a></li><li><a href="https://directorsblog.nih.gov/2014/06/26/print-and-fold-origami-microscope-for-50-cents/" target="_top">Print-and-Fold Origami Microscope for 50 Cents </a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="http://www.nature.com/articles/s41551-016-0009">Hand-powered ultralow-cost paper centrifuge</a>. Bhamla MS, Benson B, Chai C, Katsikis G, Johri A, Prakash M. <em>Nat. Biomed. Eng.</em> 1, 0009 (2017). doi:10.1038/s41551-016-0009.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH Director’s New Innovator Award, NIH’s National Center for Advancing Translational Sciences (NCATS), Stanford School of Medicine, Pew Foundation, Moore Foundation, and National Science Foundation.</p>
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