Aorto ostial stenting requires extra caution and special technique. It always worry us what if few mm of metal might project into Aorta when we stent a RCA or left main ostium.
To prevent this ,Merit- medical has innovated a catheter that help us position the stent exactly at the ostial level .It is done with a help of an octopus like buttressing arm that support the aortic wall when the stent is deployed .
Watch the video.
Reference
Dr.S.Venkatesan MD 
Thank you for sharing this impressive video. I hope I am able to have clinical experiences that include this type of work. Very informative.