** Shares of EBR Systems EBR.AX rises as much as 9.5% to A$1.215, set for their strongest intraday session since May 23
** Medtech firm says heart pacer WiSE System has been successfully implanted in the first commercial patients in the U.S., following recent FDA approval
** Adds, it remains on track for initiation of its limited market release and expected reimbursement add-on payments commencing October
** Stock last up 5.4%, taking YTD gains to 14.2%
(Reporting by Kumar Tanishk in Bengaluru)
((Tanishk.Kumar@thomsonreuters.com; X: @thatstanishk http://www.x.com/thatstanishk;))