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Miniature pressure sensors for medical touch (3/11/2012)

Tags:
flexible sensors, sensors
These flexible, transparent pressure sensors invented by UC Davis biomedical engineers use a drop of liquid that acts as a variable capacitor. -  Tingrui Pan, UC Davis.
These flexible, transparent pressure sensors invented by UC Davis biomedical engineers use a drop of liquid that acts as a variable capacitor. - Tingrui Pan, UC Davis.

A new kind of flexible, transparent pressure sensor, developed at the University of California, Davis, for use in medical applications, relies on a drop of liquid.

The droplet goes in a flexible sandwich of the substance polydimethylsiloxane, or PDMS. The sensor acts as a variable electrical capacitor. When the sensor is pressed down, the sensing droplet is squeezed over conductive electrodes, increasing its capacitance.

"There's a huge need for flexible sensors in biosensing," said Professor Tingrui Pan, who led the research project.

He and his colleagues used the sensor successfully in measuring the pulse in the human neck. The sensor also could be used in "smart gloves," giving physicians an enhanced ability to measure the firmness of tissues and detect tumors, and in "smart contact lenses," to monitor intraocular pressure without affecting vision.

Note: This story has been adapted from a news release issued by the University of California - Davis

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