Fabrication and characterization of microscale sensors for bone surface strain measurement

We present micro-fabrication and device characterization results towards the realization of a flexible, implantable sensor array for measuring surface strain on live bone. Thin-film metal strain gauges were embedded in a polydimethyl-siloxane (PDMS) membrane. Various adhesives used to adhere the device to both imitation bone materials and cow bones were tested. The measured strain level and resolution indicates that the device is suitable for bone surface strain measurement. Ultimately, this gauge will be part of an implantable, wireless array for real-time monitoring of bone disease and bone remodeling.