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Novel Ultrasound Read-Out for a Wireless Implantable Passive Strain Sensor (WIPSS)

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7 Author(s)
F. Gattiker ; Empa - Materials Science & Technology, 8600 Dubendorf, Switzerland. Tel: +41-44-823-4330; E-mail: ; F. Umbrecht ; D. Muller ; J. Neuenschwander
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Monitoring the deformation of orthopedic implants during rehabilitation exercises helps preventing their possible failure due to repeated overloads. For this reason we propose a completely new sensor concept, which consist of a passive load sensor and its associated ultrasound-based read-out unit. The measurement principle is based on the transformation of a force into a varying amount of fluid in a micro channel integrated into the sensor. A novel ultrasound read-out method is applied to monitor the fill level of the micro channel.

Published in:

TRANSDUCERS 2007 - 2007 International Solid-State Sensors, Actuators and Microsystems Conference

Date of Conference:

10-14 June 2007