Optical Wireless Charging to Deeply Implantable Biomedical Devices Using 810 nm NIR LED: A Feasibility Study
Fuada, Syifaul; Särestöniemi, Mariella; Katz, Marcos (2025-07-07)
IEEE
07.07.2025
S. Fuada, M. Särestöniemi and M. Katz, "Optical Wireless Charging to Deeply Implantable Biomedical Devices Using 810 nm NIR LED: A Feasibility Study," 2025 IEEE Wireless Power Technology Conference and Expo (WPTCE), Rome, Italy, 2025, pp. 1-6, doi: 10.1109/WPTCE62521.2025.11062218.
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© 2025 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202508045211
https://urn.fi/URN:NBN:fi:oulu-202508045211
Tiivistelmä
Abstract
Recent advancements in implantable biomedical devices (IBDs) have been remarkable, driven by the ongoing quest to enhance patient care through minimally invasive approaches. However, a key challenge remains in powering these devices, as they depend on limited battery life, requiring a surgical replacement every time the battery has depleted. Wireless power transmission (WPT) technologies present an attractive option for recharging batteries for various IBD types. This paper proposes an application-oriented experimental setup for optical WPT (OWPT) through a phantom mimicking tissue up to 40 mm thick for depth IBD implementation. We selected near-infrared (NIR) light as it penetrates the biological tissue better than other light wavelengths. An 810 nm NIR LED nm is used as the external source. A commercial photovoltaic (PV) cell captures the NIR light penetrating the phantom and further processes it with a power management integrated circuit (PMIC). A supercapacitor stores the harvested energy (approximately 5 Joules). The time needed to fully charge the supercapacitor was observed under 375 mW of transmitted optical power. Although full charging requires considerable duration (approximately 4 hours), OWPT using 810 nm NIR LED still promotes a practically feasible solution; it demonstrates a viable energy source for recharging IBDs wirelessly. This paper also discusses open issues concerning this research field.
Recent advancements in implantable biomedical devices (IBDs) have been remarkable, driven by the ongoing quest to enhance patient care through minimally invasive approaches. However, a key challenge remains in powering these devices, as they depend on limited battery life, requiring a surgical replacement every time the battery has depleted. Wireless power transmission (WPT) technologies present an attractive option for recharging batteries for various IBD types. This paper proposes an application-oriented experimental setup for optical WPT (OWPT) through a phantom mimicking tissue up to 40 mm thick for depth IBD implementation. We selected near-infrared (NIR) light as it penetrates the biological tissue better than other light wavelengths. An 810 nm NIR LED nm is used as the external source. A commercial photovoltaic (PV) cell captures the NIR light penetrating the phantom and further processes it with a power management integrated circuit (PMIC). A supercapacitor stores the harvested energy (approximately 5 Joules). The time needed to fully charge the supercapacitor was observed under 375 mW of transmitted optical power. Although full charging requires considerable duration (approximately 4 hours), OWPT using 810 nm NIR LED still promotes a practically feasible solution; it demonstrates a viable energy source for recharging IBDs wirelessly. This paper also discusses open issues concerning this research field.
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