Patent ID: 8057502

Claim:
Surgical obturator for piercing a body wall, comprising: a tubular housing that at one end forms an introduction tip with a continuously decreasing diameter, a blade projecting from the introduction tip for making an incision in the body wall, a blade carrier which carries the blade, the blade carrier being mounted in a longitudinally displaceable manner in the housing, the introduction tip comprising two portions, a proximal portion, which is part of the housing, and a central protective cap, which is displaceable in a longitudinal direction relative to the housing between an advanced inoperative position and a retracted working position, a retraction device disposed in the housing which comprises: a first spring for displacing the blade carrier in the longitudinal direction from an advanced cutting position into a retracted protected position, and a catch, which during advancement of the blade carrier locks the blade carrier in the advanced cutting position, the retraction device being activated by a displacement of the protective cap from the working position into the inoperative position, wherein: the outer surface of the protective cap in the retracted working position merges continuously into the outer surface of the proximal portion, in the advanced inoperative position a step is formed between the protective cap and the proximal portion of the introduction tip, the blade in the cutting position projects in a region of the retracted protective cap and in a distal region of the proximal portion from a contour of the protective cap and a contour of the distal region of the proximal portion, and the protective cap during the displacement from the working position into the inoperative position releases the catch and triggers the displacement of the blade carrier into the retracted position.