Robotic device can test blood faster

Scientists have created a robotic device that can automatically draw blood and quickly test samples, potentially improving the workflow in hospitals and allowing health care practitioners to spend more time treating patients.

"This device represents the holy grail in blood testing technology," said Martin L Yarmush at Rutgers University-New Brunswick in the US.

"Integrating miniaturised robotic and microfluidic (lab-on-a-chip) systems, this technology combines the breadth and accuracy of traditional blood drawing and laboratory testing with the speed and convenience of point-of-care testing," said Yarmush.

Diagnostic blood testing is the most commonly performed clinical procedure in the world, and it influences most of the medical decisions made in hospitals and laboratories.

However, the success rate of manually drawing blood samples depends on clinicians' skill and patient physiology, and nearly all test results come from centralised labs that handle large numbers of samples and use labour-intensive analytical techniques.

The research team created a device that includes an image-guided robot for drawing blood from veins, a sample-handling module and a centrifuge-based blood analyser.

Their device provides highly accurate results from a white blood cell test, using a blood-like fluid spiked with fluorescent microbeads. The testing used artificial arms with plastic tubes that served as blood vessels.

The device could provide rapid test results at bedsides or in ambulances, emergency rooms, clinics and doctors' offices.

"When designing the system, our focus was on creating a modular and expandable device," said Max Balter, from Rutgers, who led the study.

"With our relatively simple chip design and analysis techniques, the device can be extended to incorporate a broader panel of tests in the future," said Balter.