** Memphasys MEM.AX soars as much as 57.1% to A$0.011, set for biggest intraday gain since August 18, 2022
** Stock hits highest since January 6
** Medical devices maker reports positive clinical trial results for its Felix sperm selection system
** Says results exceed industry benchmarks in sperm selection for assisted reproductive technology
** Stock logs busiest trading day since October 2018, with ~50.3 mln shares traded vs 30-day avg of ~1.8 mln
** MEM last up ~43%, extends YTD gains to 25%
(Reporting by Aaditya Govind Rao in Bengaluru)
((Aaditya.govindrao@thomsonreuters.com;))