http://en.wikipedia.org/wiki/Da_Vinci_Surgical_System, http://www.davincisurgery.com
A machine can be much more accurate than a person.
http://robotic-surgery.med.nyu.edu/for-patients/what-robotic-surgery/da-vinci-system,
http://biomed.brown.edu/Courses/BI108/BI108_2005_Groups/04/davinci.html
http://www.intuitivesurgical.com/products/davinci_surgical_system
http://www.cts.usc.edu/rsi-davincisystem.html