Drazan John F, Abdoun Omar T, Wassick Michael T, Marcus George A, Dahle Reena, Beardslee Luke A, Cady Nathaniel C, Ledet Eric H
Annu Int Conf IEEE Eng Med Biol Soc. 2016 Aug;2016:1930-1933. doi: 10.1109/EMBC.2016.7591100.
Passive, LC resonators have the potential to serve as small, robust, low cost, implantable sensors to wirelessly monitor implants following orthopedic surgery. One significant barrier to using LC sensors is the influence on the sensor's resonance of the surrounding conductive high permittivity media in vivo. The surrounding media can detune the resonant frequency of the LC sensor resulting in a bias. To mitigate the effects of the surrounding media, we added a "capping layer" to LC sensors to isolate them from the surrounding media. Several capping materials and thicknesses were tested to determine effectiveness at reducing the sensor's interaction with the surrounding media. Results show that a 1 mm glass capping layer on the outer surfaces of the sensor was sufficient to reduce the effects of the media on sensor signal to less than 1%.
无源LC谐振器有潜力作为小巧、坚固、低成本的可植入传感器，用于在骨科手术后对植入物进行无线监测。使用LC传感器的一个重大障碍是体内周围导电高介电常数介质对传感器共振的影响。周围介质会使LC传感器的共振频率失谐，从而导致偏差。为减轻周围介质的影响，我们在LC传感器上添加了一个“覆盖层”，以将它们与周围介质隔离开来。测试了几种覆盖材料和厚度，以确定在减少传感器与周围介质相互作用方面的有效性。结果表明，在传感器外表面上设置1毫米厚的玻璃覆盖层足以将介质对传感器信号的影响降低到1%以下。
