HMN 2025: What is the Ultrasound-based wi-fi charging expertise for implantable medical gadgets

A analysis staff led by Professor Jinho Chang from the Department of Electrical Engineering and Computer Science at DGIST has developed an “ultrasound-based wi-fi charging expertise” able to quickly and effectively charging the batteries of implantable medical gadgets. This expertise has achieved world-class vitality effectivity, totally charging a commercial battery inside two hours, even contained in the human physique.

The analysis is published within the journal Biosensors and Bioelectronics.

Recently, resulting from inhabitants growing old, ailments, and accidents, a fast enhance in demand for implantable medical gadgets (e.g., pacemakers and neural stimulators) has been noticed. However, the batteries in these gadgets should be changed periodically, requiring sufferers to endure repeated surgical procedures—posing each inconveniences and dangers. To handle this subject, growing expertise that may wirelessly transmit vitality from outdoors the physique is important with a purpose to cost the batteries with out the necessity for extra surgical procedures.

Although wi-fi charging applied sciences utilizing ultrasound have existed beforehand, harvesters (vitality receivers) that may be implanted within the human physique have confronted limitations in dimension and construction. Additionally, the ultrasound depth that may be safely used within the human physique is restricted, leading to inadequate energy output.

To overcome these limitations, Professor Chang’s analysis staff at DGIST developed a brand new sort of “sandwich-structured piezoelectric vitality harvester.” Two piezoelectric layers are stacked such that the entrance layer harvests incoming ultrasound vitality to generate electrical energy, whereas the rear layer captures the residual ultrasound to supply extra energy. By combining the output from each layers, the harvester achieves over 20% larger effectivity in comparison with that of standard designs.

Using this expertise, the analysis staff demonstrated {that a} 140mAh commercial battery might be totally charged in only one hour and 40 minutes at an underwater distance of 30mm. In one other experiment utilizing 30mm-thick pig tissue, a 60mAh battery was totally charged inside one hour and 20 minutes. These outcomes signify a world-leading efficiency, reaching at the very least twice the facility output of beforehand reported applied sciences.

Professor Chang acknowledged, “This analysis presents an modern expertise that successfully harvests ultrasound vitality, which has not been totally utilized prior to now, for wi-fi charging of implantable medical gadgets. We goal to commercialize a system able to totally charging inside one hour by combining this ultrasound-based wi-fi charging expertise with high-efficiency semiconductor parts.”