Sunday, July 31, 2011

Mchip Diagnoses Infectious Diseases Like HIV And Syphilis At Patients' Bedsides; New Device Could Streamline Blood Testing Worldwide

Samuel K. Sia, assistant professor of biomedical engineering at Columbia Engineering, has developed an innovative strategy for an integrated microfluidic-based diagnostic device—in effect, a lab-on-a-chip—that can perform complex laboratory assays, and do so with such simplicity that these tests can be carried out in the most remote regions of the world. In a paper published in Nature Medicine online on July 31, Sia presents the first published field results on how microfluidics—the manipulation of small amounts of fluids—and nanoparticles can be successfully leveraged to produce a functional low-cost diagnostic device in extreme resource-limited settings.

Sia and his team performed testing in Rwanda over the last four years in partnership with Columbia's Mailman School of Public Health and three local non-government organizations in Rwanda, targeting hundreds of patients. His device, known as mChip (mobile microfluidic chip), requires only a tiny finger prick of blood, effective even for a newborn, and gives—in less than 15 minutes—quantitative objective results that are not subject to user interpretation. This new technology significantly reduces the time between testing patients and treating them, providing medical workers in the field results that are much easier to read at a much lower cost. New low-cost diagnostics like the mChip could revolutionize medical care around the world.

"We have engineered a disposable credit card-sized device that can produce blood-based diagnostic results in minutes," said Sia. "The idea is to make a large class of diagnostic tests accessible to patients in any setting in the world, rather than forcing them to go to a clinic to draw blood and then wait days for their results."

Sia's lab at Columbia Engineering has developed the mChip devices in collaboration with Claros Diagnostics Inc., a venture capital-backed startup that Sia co-founded in 2004. (The company has recently been named by MIT's Technology Review as one of the 50 most innovative companies in the world.) The microchip inside the device is formed through injection molding and holds miniature forms of test tubes and chemicals; the cost of the chip is about $1 and the entire instrument about $100.

Sia hopes to use the mChip to help pregnant women in Rwanda who, while they may be suffering from AIDS and sexually transmitted diseases, cannot be diagnosed with any certainty because they live too far away from a clinic or hospital with a lab. "Diagnosis of infectious diseases is very important in the developing world," said Sia. "When you're in these villages, you may have the drugs for many STDs, but you don't know who to give treatments to, so the challenge really comes down to diagnostics." A version of the mChip that tests for prostate cancer has also been developed by Claros Diagnostics and was approved in 2010 for use in Europe.

Sia's work also focuses on developing new high-resolution tools to control the extracellular environments around cells, in order to study how they interact to form human tissues and organs. His lab uses techniques from a number of different fields, including biochemistry, molecular biology, microfabrication, microfluidics, materials chemistry, and cell and tissue biology.

Contacts and sources:

Sia was named one of the world's top young innovators for 2010 by MIT's Technology Review for his work in biotechnology and medicine, and by NASA as one of 10 innovators in human health and sustainability. In 2008, he received a CAREER award from the National Science Foundation that included a $400,000 grant to support his other research specialty in three-dimensional tissue engineering. A recipient of the Walter H. Coulter Early Career Award in 2008, Sia participated in the National Academy of Engineering's U.S. Frontiers of Engineering symposium for the nation's brightest young engineers in 2007. He earned his B.Sc. in biochemistry from the University of Alberta, and his Ph.D. in biophysics from Harvard University, where he was also a postdoctoral fellow in chemistry and chemical biology.

The mChip project has been supported by funding from the National Institutes of Health and Wallace Coulter Foundation.

Columbia Engineering

Columbia University's Fu Foundation School of Engineering and Applied Science, founded in 1864, offers programs in nine departments to both undergraduate and graduate students. With facilities specifically designed and equipped to meet the laboratory and research needs of faculty and students, Columbia Engineering is home to NSF-NIH funded centers in genomic science, molecular nanostructures, materials science, and energy, as well as one of the world's leading programs in financial engineering. These interdisciplinary centers are leading the way in their respective fields while individual groups of engineers and scientists collaborate to solve some of society's more vexing challenges.


  1. Sia được MIT's Technology Review đánh giá là một trong những nhà cải tiến trẻ hàng đầu thế giới năm 2010 vì công trình công nghệ sinh học và y học, và được NASA là một trong 10 nhà cải tiến về sức khỏe và sự bền vững của con người. Năm 2008, anh nhận được giải thưởng CAREER từ Quỹ khoa học quốc gia bao gồm khoản tài trợ 400.000 đô la để hỗ trợ chuyên ngành nghiên cứu khác của mình trong kỹ thuật mô ba chiều. Là người nhận Giải thưởng Sự nghiệp sớm Walter H. Coulter năm 2008, Sia đã tham gia Hội nghị chuyên đề về kỹ thuật biên giới của Học viện Kỹ thuật Quốc gia Hoa Kỳ cho các kỹ sư trẻ sáng giá nhất của quốc gia vào năm 2007. trong sinh hóa từ Đại học Alberta, và bằng tiến sĩ của mình trong sinh lý học từ Đại học Harvard, nơi ông cũng là một nghiên cứu sinh sau tiến sĩ về hóa học và sinh học hóa học. Blog của bạn rất ý nghĩa

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