Cholestrobot will enter the body through a pill. Once the robot is
inside the major blood vessels the sonar sends pictures to the
microprocessor.

When plaque is detected the microprocessor instructs the fins and
arms to begin moving to scoop out the plaque. The plaque is then
vacuumed into the laser chamber where it is vaporized and sent out
as a gas into the circulatory system.
Links
Cholestrobot In Action