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We've heard of 3D printers someday building human organs before, but what's noteworthy about this project is this printed ear intertwines embedded electronics. These Princeton researchers basically 3D-printed cells and nanoparticles, and then combined a small coil antenna with cartilage to create this "bionic" ear, according to the university.The result was a fully-functional organ that can hear radio frequencies a million times higher than our human ears, lead researcher Michael McAlpine told Mashable.
« The way that our ear hears now is we pick up acoustic signals and then we convert those into electrical signals that go to our brain, » said McAlpine, who is an assistant professor of mechanical and aerospace engineering at Princeton. « What this ear does is it has this electronic coil on it and it picks up electronic signals directly. »
McAlpine said he and his research team basically wanted to ask the question of whether they could grow an organ in a petri dish, with the electronics intertwined into the organ as it grew. Their successful project used a $1,000 3D printer to print the cells with the electronics (see video below). The « ear » was then put in a dish so the cells could culture for 10 weeks into cartilage tissue.