Abstract
We present circular architecture bioimplant strain sensors that facilitate a strong resonance frequency shift with mechanical deformation. The clinical application area of these sensors is for in vivo assessment of bone fractures. Using a rectangular geometry, we obtain a resonance shift of 330 MHz for a single device and 170 MHz for its triplet configuration (with three side-by-side resonators on chip) under an applied load of 3,920 N. Using the same device parameters with a circular isotropic architecture, we achieve a resonance frequency shift of 500 MHz for the single device and 260 MHz for its triplet configuration, demonstrating substantially increased sensitivity.
Highlights
Fixation plates are routinely used for major bone fracture cases
We significantly increased the sensor Q-factor and resonance frequency shift compared to the architectures used in the previous works
We aim for a high Q-factor by using bio-compatible materials with a maximum possible resonance frequency shift
Summary
As the healing tissue develops stiffness and strength, the load borne by the plate decreases [1]. During this process, a sensor capable of monitoring strain telemetrically and in real time is highly desirable. When force is applied to the sensor via its attachment to the fixation plate, the resulting strain is observed via a resonance frequency (fo) shift. Using this emerging technology, physicians would be able to assess the healing process by examining these temporal changes in strain. We present a circular architecture RF-MEMS bioimplantable strain sensor that demonstrates a substantially higher Q-factor and larger frequency shift compared to a rectangular architecture
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