** Shares of Hancock Jaffe Laboratories Inc HJLI.O jump
27.2 pct to $2.99 premarket
** Medical device developer says https://ir.hancockjaffe.com/press-releases/detail/29/hancock-jaffe-announces-successful-start-to-coreograft
its bypasses using its CoreoGraft device were successfully
completed in two test subjects
** HJLI's CoreoGraft is a potential alternative to using
saphenous vein grafts, which is the leading approach used for
majority of cardiac surgeries
** HJLI shares among top pct gainers across U.S. exchanges
in premarket trading
** Up to Friday's close, HJLI shares have risen 59.3 pct
this year
(Reporting by Shreyashi Sanyal in Bengaluru)
((RM: Shreyashi.Sanyal.thomsonreuters.com@reuters.net))