An Algorithm for the Computer Aided Design of Coil Couple for a Misalignment Tolerant Biomedical Inductive Powering Unit

Abstract

Coils misalignments restrain the wider implementation of inductive powering of implantable medical devices. The misalignment problem can be overcome with the help of the coils geometry optimization. Coil couple design implies simultaneous adjustment of the several parameters (coils radii, turns numbers, and pitch). Thus, it is desirable to have the means for computer-aided design of the system. An algorithm for the coil couple design is devised. The key feature of the algorithm is the use of predefined maximum and minimum acceptable values of the load power as a performance metric. The algorithm gives the geometry of the coil which ensures that the inductive powering unit provides the given range of the load power for the given range of the misalignments. A formal method is proposed for the calculation of the initial coils characteristics and consequent adjustment of the transmitting coil external radius, transmitting coil turns number, coils internal radii (simultaneously), and receiving coil turns number. The software implementing the proposed algorithm was developed. Eight design runs were performed in order to evaluate the algorithm performance in various conditions, including different power ranges (10 W, 100 mW, and 300 µW), operating frequencies (0.2 MHz, 1 MHz, 6.78 MHz, and 13.56 MHz), and possible implementations (ventricular assist devices, cochlear implants, and spinal cord stimulators). It was proved that the power drop as low as 10% of the mean load power can be ensured for the lateral misalignments up to the receiving coil external radius. The low-power inductive powering unit was constructed and tested. The experimental results confirm the numerical modeling. INDEX TERMS Electromagnetic coupling, inductive charging, inductive power transmission, implants.

Enhanced Ionic Polymer–Metal Composites with Nanocomposite Electrodes for Restoring Eyelid Movement of Patients with Ptosis

“…It should be noted that the eyelid implant created on the material considered in this paper will consume negligible energy (<10 J/day). Therefore, the battery located under the skin will be enough to charge once for 1–2 months using known wireless power transmission systems [ 61 ]. In addition, future studies can consider the electromyography (EMG) signal of the healthy eyelid muscles [ 62 ] in the definition of the input voltage of IPMC.…”

Design of computer algorithms based on parametric models

“…Associative formulas ( 17), ( 18), (19), and (20) are collapsed: are monotonically decreasing functions, then the minimum of…”

“…Computers, as a solution to the problem of complex systems as an important means and tools, are widely used in the field of mechanical and electronic engineering and other fields, but the computer system structure, system software, and application software development and researchers must think about the important issues [13][14][15]. However, against the background of the rapid development of the Internet industry, people pay more attention to program results and neglect to care about the embodiment of the discrete nature of computer algorithm design and data structure [18][19]. However, with the digital electronic computer as a discrete structure, discrete mathematics can be regarded as the abstraction of computer problems, and its related problems have the manifestation of a discrete nature.…”

Magic of 5G Technology and Optimization Methods Applied to Biomedical Devices: A Survey

“…For implantable medical devices, wireless energy transferring is developing exponentially and the most famous solution is that of inductive powering. The inductive coils misalignment is the main drawback in wider wireless powering and is solved by the geometry optimization presented in [70]. A new algorithm for the coil couple design is presented where it provides a performance metric where the maximum and minimum targeted values of the load power are defined.…”