A noninvasive method and apparatus for withdrawing fluid from an organism and determining the concentration of a substance in the fluid is disclosed. The noninvasive apparatus comprises a substance concentration sensor (120) that includes an extraction transducer (126) and a substance sensing transducer...http://www.google.es/patents/US5617851?utm_source=gb-gplus-sharePatente US5617851 - Ultrasonic transdermal system for withdrawing fluid from an organism and determining the concentration of a substance in the fluid
Ultrasonic transdermal system for withdrawing fluid from an organism and ...
