Study of Midfield Wireless Power Transfer for Implantable Medical Devices

Mid-field wireless power transfer (MF-WPT) is a scheme developed for transcutaneous power transfer to microimplants kept deep inside the body in GHz frequency. With deep seated implants, the possible locations available for application increases to almost the entire body. But, this advantage of applicability is severely limited as the power delivered to the micro implants by MF-WPT is very low - in the range of few 100W. Yet, the mid-field operations have higher efficiency in miniaturized weakly coupled coil implants compared to traditional near-field system. So, with improvement in certain aspects, MF-WPT is expected to play a vital role in biomedical field. For the same reason this paper focuses on analyses of literature available in various aspects of MF-WPT, its challenges, drawbacks and future scope of the scheme in medical field.