** Shares of Australia's Imricor Medical Systems IMR.AX rise as much as 26% to A$1.99, their highest level since July 21, 2021

** Stock posts its biggest intraday pct gain in nearly three years

** Medical device developer says the U.S. Food and Drug Administration (FDA) has granted clearance to commercially market its Vision-MR Diagnostic Catheter

** Vision-MR Diagnostic Catheter enables electrophysiologists to use MRI for precise, clear visualisation of cardiac anatomy

** IMR rose 12.5% in 2025

(Reporting by Aamir Sheik Khalid in Bengaluru)

((Aamir.SheikKhalid@thomsonreuters.com))