implantable medical devices

Design of Ceramic Packages for Ultrasonically Coupled Implantable Medical Devices

Author(s): Konlin Shen, Michel M. Maharbiz
Design of Ceramic Packages for Ultrasonically Coupled Implantable Medical Devices 170 177 IEEE Transactions on Biomedical Engineering (TBME)
Ultrasonic power transfer has emerged as an efficient method for powering and communicating with small and deeply implanted medical devices. However, most work utilizing ultrasonically-coupled implants relies on non-hermetic polymeric encapsulation materials rather than conventional metal or ceramic packaging materials due to the inherent acoustic impedance mismatch of metals and ceramics. Here, we develop models of ultrasonic power transfer through metals, examining flexural and bulk mode propagation, to determine optimal package design for ultrasonic power transfer. We utilize these results to build millimeter-scale hybrid ceramic/metal packages, and perform benchtop demonstrations of ultrasonic powering and communication with a packaged electrophysiology sensor. read more

Evaluation of Secrecy Capacity for Next-Generation Leadless Cardiac Pacemakers

Author(s): Muhammad Faheem Awan, Pritam Bose, Ali Khaleghi, Kimmo Kansanen, Ilangko Balasingham
Evaluation of Secrecy Capacity for Next-Generation Leadless Cardiac Pacemakers 170 177 IEEE Transactions on Biomedical Engineering (TBME)
Cardiac pacemakers are implanted medical devices designed to regulate abnormal cardiac rhythms. In the case of traditional pacemakers, the leads are considered to be the weakest link. This study proposes the keyless physical layer security (PLS) method to provide information confidentiality for next-generation leadless cardiac pacemakers. Electromagnetic simulations and experimental measurements were performed to prove the hypothesis of the availability of positive secrecy capacity in the near proximity of the human body. The research also evaluates the insecure volume in three-dimensional space around the body representing all the eavesdropper positions from which the pacemaker can be eavesdropped. read more