An aneurysm occurs when the wall of an artery weakens and can no longer handle the rapid coursing of blood it carries. The blood will work against the weak spot and cause the side of the artery to balloon out. At some point, the artery wall will burst from the pressure and will lead to significant brain damage and even death.
The nanorobots used in the rabbits were used to deliver drugs at the point of the aneurysm so that the weakened area would be blocked from blood flow, thus stopping it from bursting.
The tiny life-saving devices measure only 295 nanometers in diameter, three times smaller than the diameter of the most common forms of bacteria. Using a heat seeking technology to locate the aneurysm, the nanorobot parks there until its coating melts and enables the release of the medication.
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