  Otologic surgery has some specificities compared to others surgeries. The
anatomic working space is small, with various anatomical structures to
preserve, like ossicles or facial nerve. This requires the use of microscope or
endoscope. The microscope let the surgeon use both hands, but allows only
direct vision. The endoscope leaves only one hand to the surgeon to use his
tools, but provides a "fish-eye" vision. The rise of endoscopy these past few
years has led to the development of numerous devices for the surgeon: the
Robotol, first otological robot designed to performed some movements and hold
an endoscope, or the Endofix Exo. Both devices need the hand of the surgeon to
be moved. No robotic device allows the endoscope to be directed autonomously
while the surgeon keeps both hands free to work, just like when he is working
with a microscope. The objective of our work is to define the specific needs of
the otological assistance surgery.
