The paper is about our own experiences in sealing truncal varicose veins over exactly 89 months.Since 21 years by now, varicosis has been increasingly treated endovenously. At the start, the rather inconvenient VNUS®Closure plus - procedure and the more convenient linear laser procedure were used, and these were followed in 2007 by the 1st. generation of bipolar RFITT® - catheter, the VNUS® ClosureFast® - system, and different techniques of radiallaser. Thus, in the course of the last few years, plenty of experience has been gathered with endoluminal therapy, quality criteria have been defined and standards for the different techniques have been developed. All vascular and phlebology societies have declared guidelines for this very in relation very minimal invasive techniques of therapy. The newest technical developement ist the noninvasive SONOVEIN® - system, a HIFU technology. The author has made some therapies with this system - but in the moment we prefer the minimalinvasive nonthermal therapy absolutely.The present research paper sheds light on the advantages and presents the 89 months results of a single - center praxis study with a prospective design.