Patent ID: 8403840

Claim:
A minimally invasive access instrument for creating an access for a minimally invasive intervention, comprising: a body having a longitudinal central axis, said body being assembled of at least two parts, each of said parts having edges extending along a direction of said axis, and said parts being assembled via said edges, each of said parts having a distal section merging into a proximal section standing outwardly from said longitudinal central axis when said distal section extends in said axis, wherein in a first position said distal end sections of said parts are joined along said edges to form a distal body with said proximal sections standing outwardly, and in a second position, said proximal sections of said parts are joined along said edges to form a hollow proximal body with said distal sections standing outwardly, wherein a change-over from said first position to said second position, and vice versa, can be brought by pivoting said parts along a curved transition area between said distal sections and said proximal sections of said edges without a separate holding element holding said parts together, and wherein said edges being provided with interacting features which are designed to block a lateral sliding of said joined parts transversely to said edges, said interacting features comprising projections projecting from one edge and engaging with respective recesses in an opposite edge, each of said respective recesses having side walls that prevent said lateral sliding of a projection once said projection is in engagement with said recess, said interacting features at said edges providing a guide guiding said pivoting along said curved transition area and preventing a lateral slipping away of said edges and providing a gastight seal along said proximal sections of said edges in said second position.