Fig. 2From: Needle penetration test - qualifying examination of 3D printable silicones for vascular models in surgical practiceA step by step scheme of the Seldinger technique. The needle puncturing the vessle (a). After puncture a wire is going to be inserted into the vessle as guidance fort he cannula or dilatators if needed (b). The needle can now be withdrawn from the body (c). A insision (d) helps the cannula or dilatator (e) to get inserted in the vessle with a rotational move. In the end the cannula stays in the patient and is ready to be used (f)Back to article page