It's odd you laugh at that when Si3N4 can be used in several different markets as opposed to just ortho, which is all Implex hydrocel could be used for.
Another thing, Si3N4 is a superior material to that of Hydrocel. It's antimicrobial, increases osteointegration, biodegrades over accumulating in a person's blood. Maybe most importantly it doesnt act as an antenna for electromagnetic radiation!