The investigators tested the platform in vitro using human vasculature models and in vivo in sheep and pigs under realistic clinical conditions to demonstrate its capabilities.
I suppose, realistic clinical conditions, means it was done in a lab and they wore masks.
Their tests demonstrated that by applying specific magnetic fields, the system can be made to maneuver through complex blood vessels and cerebrospinal spaces, trigger controlled heating to dissolve the microrobot, and precisely release drugs into targeted tissues, even reaching the smallest vessels.