Sonic Scalpels in the Real World, Sonic swords far behind?

http://www.zdnet.com/article/invisible-knife-slices-with-sound-waves/<br /><br />http://www.futurity.org/invisible-knife-focuses-sound-waves-to-slice/<br /><br /><br />With the sonic scalpel on the horizon could we eventually see sonic knives and swords?<br />