Patent ID: 8668711
Filing Date: 2014-03-11
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 said shaft of said other instrument 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 thereof, a second end of said slats, opposite to said first end, being connected to said seal in an area of said opening, said slats forming said expansion cone narrowing from a proximal to a distal end thereof, wherein said slats are connected at its first ends to said annular body via spherical heads engaging into corresponding openings in said annular body, wherein said second end of said slats of said expansion cone are connected with a form fit to a socket provided at an edge of said opening in said seal.