Patent ID: 8007471
Filing Date: 2011-08-30
Classification: A61B

Abstract:
1. A medical instrument having a cannula a seal disposed in said cannula, said seal has an opening for guiding a shaft of another instrument through said seal and said cannula in a sealed manner, an expansion device for expanding said opening in said seal for guiding shafts of said other instruments of greater diameter in a sealed manner through said expanded opening, said expansion device having an expansion cone comprising a plurality of slats mounted pivotably on an annular body at a first end, a second end of said slats opposite to said first end, being connected to said seal in an area of said opening, and a flexible casing structure accommodating said seal and said expansion device; wherein said flexible casing structure is a flexible casing tube that is composed of a series of substantially parallel ring elements; and wherein said seal is designed as a pot-seal having said opening in a bottom of said pot, said pot-seal extending in a distal direction away from a distal end of said expansion cone.