A surgical apparatus for the placement of an instrument within a body cavity which comprises (i) a placement device including an elongate element with an exposable tissue piercing tip, a first coupler adjacent to the tip, and a structure for selectively exposing the tip; and (ii) an elongate instrument...http://www.google.de/patents/US5152749?utm_source=gb-gplus-sharePatent US5152749 - Instrument placement apparatus
