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

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7 Author(s)
Gattiker, F. ; Empa - Mater. Sci. & Technol., Dubendorf ; Umbrecht, F. ; Muller, D. ; Neuenschwander, J.
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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:

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

Date of Conference:

10-14 June 2007