The Cannulas


Industry has attempted to keep pace with racing developments in the field of ultrasonography by making needles out of special materials which, when correctly used, show up with an even sharper outline in the ultrasonographic image. Depending on the manufacturer, various procedures are used here. However, socalled ‚atraumatic‘ needles should always be used in ultrasonographic guidance of blocks as well. This is especially true when the user is less practiced and – as experience has shown – generally has more difficulty at first in visualizing the tip of the needle.