** Optiscan Imaging OIL.AX rises 6.82% to A$0.1175; marks biggest percentage gain since April 17
** Imaging technologies maker and Mayo Clinic have come together to advance the development of a digital endomicroscopic imaging system for use in robotic surgery
** Co says development plan on track and project's next phase will take place at the Mayo Clinic's Florida campus
** OIL loses 29% this year, as of last close
(Reporting by Sherin Sunny in Bengaluru)
((Sherin.Sunny@thomsonreuters.com;))