StartseiteAktuellesNachrichtenHandyvorrichtung für chemische Testverfahren kann Ergebnisse ohne Internet übermitteln

Handyvorrichtung für chemische Testverfahren kann Ergebnisse ohne Internet übermitteln

Innovation aus der Praxis

US-Wissenschaftler haben ein Handmessgerät für chemische Testverfahren entwickelt, das Ergebnisse über ein einfaches Mobiltelefon ohne Internetverbindung übermitteln kann. Das Messgerät lässt sich über den Kopfhörereingang an Mobiltelefone anschließen und versendet die Ergebnisse in Form von kodierten Tönen per Anruf an eine spezielle Plattform. Dort können Experten die Messdaten auswerten und diese dem Versender via SMS mitteilen. Die Vorrichtung soll beispielsweise für Blut- und Urindiagnostik einsetzbar sein, aber auch für die Wasseranlyse. Über ein Open-Source-Modul ist das Messgerät frei umprogrammierbar. Zurzeit werden Feldversuche in Indien durchgeführt. In etwa einem Jahr soll das Gerät zu einem geringen Endpreis auf den Markt gebracht werden. Die Entwickler hoffen, dass ihre Erfindung auf Grund der geringen technischen Anforderung vor allem in strukturschwachen Regionen zum Einsatz kommt.

Chemical test device diagnoses without internet

A handheld device that performs a range of chemical tests and transmits the results for remote analysis through a standard mobile phone call could be commercially available within 12 months.

The device, known as the uMED (universal Mobile Electrochemical Detector), could cost as little as US$10 to buy once a manufacturing process is in place, its developers say. It can detect levels of glucose or malaria-causing parsites in blood, salts in urine, and toxic metals in water.

The device plugs into the audio port of a mobile phone and transmits its test results to a cloud server as a series of coded tones through a standard (2G) audio phone call. Usually 3G and 4G networks are required to transmit remote diagnostics, but in the developing world their coverage can be patchy.

“The device would connect to any cell phone,” says Alex Nemiroski, a chemist at Harvard University in the United States and one of the device’s developers. This is important because “there are cell phones and 2G networks all over, even in places where there are no roads and no running water”, he says.

Another advantage of the uMED is that it can operate for months at a time on a single battery charge, he adds.

“The device is really simple to use,” he says. A user just inserts a test strip into the device, selects the test, applies the sample of blood, urine or water to the test strip and makes a phone call, which automatically transfers the results.

Patients can receive their diagnosis — potentially by SMS message — once the results have been analysed remotely by an expert, says Nemiroski. The results could also be automatically archived, he suggests, allowing governments to survey the spread of disease, for example. 

The simple construction of the uMED, and the fact that it uses an open-source controller unit, means it can be reprogrammed and adapted to local needs or conditions, he says.

Nemiroski and colleagues published a paper outlining the device in Proceedings of the National Academy of Sciences in June. The uMED is currently undergoing field trials in India.

Conor Hogan of the Institute of Molecular Science at La Trobe University, Australia, says the device is interesting because users don't need to have an internet connection to send off the results.

“A lot of the latest developments within the area of low-cost sensing and e-health have tended to focus on smart phones,” he says. But “doing it the most basic way possible makes it available to the widest number of people, especially those in resource-poor environments”.

Nemiroski says the team is trying to increase the number of tests uMED can perform using one test strip, and working on incorporating different types of detection, such as optical sensing.

Quelle: SciDev.Net Redaktion: von Tim Mörsch, VDI Technologiezentrum GmbH Länder / Organisationen: Global Themen: Physik. u. chem. Techn. Lebenswissenschaften Information u. Kommunikation Innovation

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