A Bioresorbable Magnetically Coupled System for Low‐Frequency Wireless Power Transfer

Abstract

Bioresorbable electronic technologies form the basis for classes of biomedical devices that undergo complete physical and chemical dissolution after a predefined operational period, thereby eliminating the costs and risks associated with secondary surgical extraction. A continuing area of opportunity is in the development of strategies for power supply for these systems, where previous studies demonstrate some utility for biodegradable batteries, radio frequency harvesters, solar cells, and others. This paper introduces a type of bioresorbable system for wireless power transfer, in which a rotating magnet serves as the transmitter and a bioresorbable antenna as the remote receiver, with capabilities for operation at low frequencies (<200 Hz). Systematic experimental and numerical studies demonstrate several unique advantages of this system, most significantly the elimination of impedance matching and electromagnetic radiation exposure presented with the types of radio frequency energy harvesters explored previously. These results add to the portfolio of power supply options in bioresorbable electronic implants.

Bioresorbable Materials on the Rise: From Electronic Components and Physical Sensors to In Vivo Monitoring Systems

“…Very similar coils were also reported by Koo et al and Guo et al for wireless energy transfer via electromagnetic coupling. In particular, Koo et al used a wireless RF receiver to stimulate peripheral nerves in injured rodents (Figure c).…”

“…Bioresorbable passive components (e.g., resistors, inductors, antennas, capacitors, diodes) have also been proposed either to complement active components (i.e., transistors) toward the realization of more complex circuits (e.g., antennas in radio frequency (RF) circuits), or to be used as transducers (e.g., heaters) in biomedical applications (e.g., antibacterial therapy).…”

A Review of Bioresorbable Implantable Medical Devices: Materials, Fabrication, and Implementation

“…Similar steps can be followed to fabricate devices based on bioresorbable polymer substrates, which are prepared separately using melt processing, electrospinning, or spin casting. [180] In another application of transfer printing found in the literature, Kim et al [181] developed a flexible microelectrode array using silk as a substrate with Au electrodes for brain-computer interfaces as a replacement for conventional rigid shanks. Another printing method for fabricating conductors on a polymer substrate was presented by Shou et al [179] Highly conductive Zn traces width line width of around 40 µm on bioresorbable sodium carboxymethylcellulose (Na-CMC) substrate was fabricated using evaporation-condensation-mediated laser printing and sintering of Zn nanoparticle, as shown in Figure 5e.…”

“…Reproduced with permission. [180] Copyright 2019, Wiley. h) Comparison between experimental and simulation results for magnetically coupled energy harvester.…”

Materials, Mechanics Designs, and Bioresorbable Multisensor Platforms for Pressure Monitoring in the Intracranial Space

“…Here, bioresorbable constituent materials minimize inflammatory responses and eliminate the need for secondary surgical extraction. [ 9–13 ] Recent examples include not only pressure but also temperature sensors for the intracranial space; [ 14–16 ] photonic devices for monitoring physiological status and neural activity; [ 17 ] wireless electronic systems for neuroregenerative therapy; [ 18 ] platforms for spatiotemporal mapping of electrical activity from the cerebral cortex; [ 19 ] drug release vehicles for infection abatement; [ 20 ] and systems for measuring blood flow. [ 21 ] Realizing consistent performance throughout a clinically relevant monitoring period with devices that bioresorb completely over slightly longer timescales represents an important goal.…”