Implantable Microrobots Video (video) Columbia University School of Engineering and Applied Science Share Print E-Mail Loading video... Caption Magnetic actuation of the Geneva drive device. A magnet is placed about 1 cm below and without contact with the device. The rotating magnet results in the rotational movement of the smaller driving gear. With each full rotation of this driving gear, the larger driven gear is engaged and rotates by 60º, exposing the next reservoir to the aperture on the top layer of the device. Credit SauYin Chin/Columbia Engineering Usage Restrictions Please use the credit: SauYin Chin/Columbia Engineering Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.