US Patent 7021173 Remote center of motion robotic system and method

A remote center of motion robotic system including a base unit and a plurality of linking units. The base unit is rotatable about a first axis. The plurality of linking units are coupled with one another. At least two of the linking units are kept parallel to each another during motion. The plurality of linking units are coupled with that base unit at a first end. The plurality of linking units are rotatable about a second axis by changing an angle between each of the plurality of links.