Ultrasound Enables Remote 3-D Printing—Even in the Human Body
12th December 2023
Mechanical engineers Shervin Foroughi and Mohsen Habibi were painstakingly maneuvering a tiny ultrasound wand over a pool of liquid when they first saw an icicle shape emerge and solidify. The pair shrieked so loudly that their colleagues down the hall at Montreal’s Concordia University could hear them. “Well, they would have heard us, if they hadn’t been at home because of COVID,” Foroughi says. Still, a quick video call let the researchers share their excitement: after months of effort, they had 3-D printed a solid object by exposing a liquid to a focused field of sound waves—transmitted through a solid wall.
The Concordia team’s new “direct-sound printing” technology is the first to create a solid structure using sound waves from behind a barrier. And although it has a long way to go to reach commercial viability, the researchers believe their remote-control 3-D printing opens the door to numerous possibilities. It could, they say, potentially enable minimally invasive tissue engineering and bioimplant repair within the human body. It could also support industrial repairs in other difficult-to-access places such as inside an airplane’s fuselage.