Abstract: The invention relates to a method of forming a coating for deposition to non-metallic surfaces, comprising the steps of applying (120) a semiconductor material to a substrate to form a semiconductor material layer and simultaneously or subsequently applying (140) metallic material or additional semiconductor material, wherein the metallic material or additional semiconductor material is introduced into the semiconductor material layer in a targeted manner to tailor the optical properties of the coating.

Abstract: A cannula for inserting a catheter is provided. The cannula comprises a first channel (30) for receiving and guiding a catheter tube (26). The first channel (30) extends to a first opening (22) and has an end portion defining an insertion direction (I), such that a catheter tube (26) when being advanced and guided through the end portion of the first channel (30) exits the cannula through the first opening (22) in the insertion direction (I). The cannula further comprises a second channel (32) for receiving a pointing device for providing a pointing beam. The second channel (32) extends to a second opening (24) and has an end portion (34) defining a pointing direction (P). The pointing direction (P) points from the second opening (24) towards a location, which is located outside the cannula along the insertion direction (I) in front of the first opening (22).