A Comprehensive Comparative Study on Inductive and Ultrasonic Wireless Power Transmission to Biomedical Implants
Year: 2018
Type: article
Abstract: This paper presents a comprehensive comparison between inductive coupling and ultrasound for wireless power transmission to biomedical implants. Several sets of inductive and ultrasonic links for different powering distances (d12) and receiver dimensions have been optimized, and their key parameters, including power transmission efficiency (PTE) and power delivered to the load (PDL) within safety constraints, have been compared to find out which method is optimal for any given condition. Two design procedures have been presented for maximizing the PTE of inductive and ultrasonic links by finding the optimal geometry for the transmitter and receiver (Rx) coils and ultrasonic transducers as well as the optimal operation frequency (fp). Our simulation and measurement results showed that the ultrasonic link transcends the inductive link in PTE and somewhat in PDL for a small Rx of 1.1 mm3(diameter of 1.2 mm), particularly when the Rx was deeply implanted inside the tissue (d12≥ 10 mm). However, for a larger 20 mm3Rx (diameter of 5 mm), the inductive link achieved higher PTE and PDL, particularly at shorter distances (d1212, the ultrasonic link is more sensitive to Rx misalignments and orientations. This led us to propose a new design procedure based on the worst-case misalignment scenario. The simulation results have been validated by measurements. The inductive and ultrasonic links, operating at 30 and 1.1 MHz, achieved measured PTEs of 0.05% and 0.65% for the 1.1 mm3Rx located 30 mm inside tissue and oil environments with optimal load resistances of 295 Ω and 3.8 kQ, respectively.
Source: IEEE Sensors Journal
Authors: Ahmed Ibrahim, Miao Meng, Mehdi Kiani
Institution: Pennsylvania State University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2797024751