Ultrasonic Wireless Charging for Implantable Devices

Researchers in Korea have made a significant breakthrough in the field of wearable and implantable electronic devices by developing a biocompatible wireless charging system. This innovative system, created by a team led by Dr. Sunghoon Hur of the Korea Institute of Science and Technology (KIST) and Professor Hyun-Cheol Song of Korea University, utilizes a flexible ultrasonic receiver that maintains its performance even when bent. By overcoming the limitations of existing wireless power transmission methods and improving biocompatibility, this technology represents a major step forward in the commercialization of next-generation electronic devices.

The wireless charging system demonstrated by the research team involves receiving ultrasonic waves to charge batteries, offering a promising solution for powering devices wirelessly. One key advantage of this system is its ability to transmit power efficiently, thanks to the use of high-efficiency piezoelectric materials and a unique structural design. The stretchable and biocompatible ultrasonic receiver is designed to conform closely to the curves of the human body, enabling stable power conversion. In tests, the system was able to transmit 20 mW of power at a distance of 3 cm underwater and 7 mW at a depth of 3 cm from the skin, providing sufficient power for low-power wearable or implantable devices.

The core component of the wireless charging system is a TENG triboelectric generator, measuring 5 cm × 5 cm. This generator utilizes a combination of materials, including a popular commercial polymer, acrylic (PMMA), a polarized ferroelectric polymer, and dielectric particles to enhance charge density generation. The composite film is coated with a tribopositive layer of polyurethane to further boost electric charge production. To ensure electrical conductivity, the components are assembled using double-sided adhesive electrode tape, with the entire system encapsulated in a waterproof polydimethylsiloxane (PDMS) solution.

With the ability to provide continuous power to low-power medical devices like pacemakers, neurostimulators, and wearable sensors, the wireless charging system holds great promise for various applications. Beyond medical devices, it is anticipated that this technology could also be utilized in underwater drones and marine sensors that require long-term power supply. Dr. Sunghoon Hur expressed optimism about the practical applications of the technology, emphasizing the importance of further research for miniaturization and commercialization to accelerate its adoption.

Overall, the development of this biocompatible wireless charging system represents a significant advancement in the field of electronic devices. By addressing key challenges related to power transmission and biocompatibility, the research conducted by the Korean team opens up new possibilities for the future of wearable and implantable technologies. With continued innovation and refinement, this technology has the potential to revolutionize the way electronic devices are powered and integrated into our daily lives.