https://phys.org/news/2018-10-smallest-steerable-catheter.html

In cooperation with their EPFL colleagues, ETH Zurich researchers working under Brad Nelson, Professor of Robotics and Intelligent Systems, have now developed a catheter with a magnetic head. Rather than being steered manually, it is operated from a computer via an external magnetic field. This enables the front part of the catheter to be bent in any direction with the highest level of precision. "As a result, the new catheter can be steered through more complex blood vessels better than a conventional catheter," says Christophe Chautems, a doctoral student in Nelson's group. Since the magnetic catheter does not require a pull wire, it can be made much thinner. The scientists have thus developed the smallest ever steerable catheter.

         
       
     
    Credit: ETH Zurich / In­dus­try Re­la­tions