Surgical instrument especially for performing neurosurgical operations

Claim 1

In a surgical instrument for performing neurosurgical operations, having a flexible suction tube connectable to a vacuum source, the suction tube being provided with a finger plate having a hole communicating with an inner space of the suction tube, the suction tube further being provided with an electric connector connectable to a high-frequency power source, and an end which localizes a field energized by said source, a portion of said suction tube reaching the locality of said field, the tube end functioning as a coagulating end, the suction tube with the tube end being provided on its outer surface with an electrically insulating, flexible plastic coating, said tube end being exposed, the improvement wherein the suction tube is formed by a flexible silver pipe which has been heat treated to permit bending during a surgical procedure by the surgeon, and said coating is made of a polyamide synthetic thermoplastic polyamide-11 material hot-melt bonded to the heat treated flexible silver pipe and produced by condensation of 11-amino-undecane carboxylic acid to a thermoplastic of the formula H[HN--(CH.sub.2).sub.10 --CO].sub.n OH based on castor oil.