Trocar sleeve

1. A trocar sleeve ( 1 ) comprising a distal tubular section ( 2 ), a section ( 3 ) which connects to the distal tubular section at a proximal side and which is widened proximally, and at least one spiral ( 8 ) having a circular contour and arranged helically on a periphery of the distal tubular section ( 2 ), the distal tubular section ( 2 ) having a length and a width, the length extending parallel to a longitudinal axis of the distal tubular section ( 2 ) and extending perpendicularly to the width, wherein the distal tubular section ( 2 ) has a polygonal cross section extending perpendicularly to the longitudinal axis of the distal tubular section ( 2 ) and parallel to the width of the distal tubular section ( 2 ), the at least one spiral ( 8 ) extending radially outwardly beyond an outer periphery of the polygonal cross-section of the distal tubular section ( 2 ).

2. The trocar sleeve according to claim 1 , wherein the at least one spiral ( 8 ) connects to an outer periphery of the distal tubular section ( 2 ) over an entire length of the at least one spiral in a distance-free manner.

3. The trocar sleeve according to claim 1 , wherein the distal tubular section ( 2 ) comprises a rounded triangular cross section.

4. The trocar sleeve according to claim 1 , wherein means ( 5 , 6 ) for releasable attachment of sealing means ( 7 ) are provided on the proximal side, said sealing means sealing the trocar sleeve ( 1 ) on the proximal side to a outside and comprising at least one automatically closing or closable opening ( 24 ) for leading through an instrument ( 15 ).

5. The trocar sleeve according to claim 1 , wherein an end section ( 19 ) connects on the proximal side to the widened section ( 3 ) and is provided with a peripheral bead ( 6 ), over which a sealing cap ( 7 ) engages.

6. The trocar sleeve according to claim 5 , wherein a holding rod ( 10 ) connects on an outer side of the end section ( 19 ), the holding rod is bent upwardly and is guided proximally and parallel to a longitudinal axis of the trocar sleeve ( 1 ), a holding arm ( 13 ) which is arranged on the holding rod in an adjustable manner and is arranged for guiding and fixing an instrument ( 15 ) led through the trocar sleeve ( 1 ).

7. The trocar sleeve according to claim 1 , wherein a trocar ( 17 ) is fastened in the trocar sleeve ( 1 ) and comprises a distal end section ( 19 ) which is tapered into a tip and whose outer contour corresponds to an inner cross section of the distal tubular section ( 2 ) and which is provided with at least one spiral ( 20 ) which connects to the at least one spiral ( 8 ) on the periphery of the distal tubular section ( 2 ) in a flush manner, when the trocar ( 17 ) is fixed in the trocar sleeve ( 1 ) in its correct position.

8. The trocar sleeve according to claim 7 , wherein a distal end ( 8 a ) of the at least one spiral ( 8 ) on the periphery of the distal tubular section ( 2 ) is arranged distally displaced with respect to a proximal end ( 20 a ) of the spiral ( 20 ) of the trocar ( 17 ).

9. The trocar sleeve according to claim 7 , wherein the trocar ( 17 ) comprises a rod ( 22 ) which connects on a proximal side to the distal end section ( 19 ), said rod having an end-side handle ( 23 ) which is dimensioned such that the handle ( 23 ) projects beyond the trocar sleeve ( 1 ) on the proximal side, when the trocar ( 17 ) is fixed in the trocar sleeve ( 1 ) in its correct position.

10. The trocar sleeve according to claim 1 , wherein the section ( 3 ) is uniformly tapered from a distal end thereof to a proximal end thereof.

11. A trocar sleeve comprising a distal tubular section ( 2 ), a section ( 3 ) which connects to the distal tubular section at a proximal side and which is widened proximally, and at least one spiral ( 8 ) having a circular contour and arranged helically on a periphery of the distal tubular section ( 2 ), wherein the distal tubular section ( 2 ) has a rounded polygonal cross section,

wherein an end section ( 19 ) connects on the proximal side to the widened section ( 3 ) and is provided with a peripheral bead ( 6 ), over which a sealing cap ( 7 ) engages,

wherein a holding rod ( 10 ) connects on an outer side of the end section ( 19 ), the holding rod is bent upwardly and is guided proximally and parallel to a longitudinal axis of the trocar sleeve ( 1 ), wherein a holding arm ( 13 ) is arranged on the holding rod in an adjustable manner and is arranged for guiding and fixing an instrument ( 15 ) led through the trocar sleeve ( 1 ), and

wherein the holding rod ( 10 ) at least in sections is designed in a hollow manner, forms a conduit connection into an inside of the trocar sleeve ( 1 ) and comprises a conduit connection ( 11 ) which may be shut off.

12. A trocar sleeve comprising a distal tubular section ( 2 ), a section ( 3 ) which connects to the distal tubular section at a proximal side and which is widened proximally, and at least one spiral ( 8 ) having a circular contour and arranged helically on a periphery of the distal tubular section ( 2 ), wherein the distal tubular section ( 2 ) has a rounded polygonal cross section,

wherein a trocar ( 17 ) is fastened in the trocar sleeve ( 1 ) and comprises a distal end section ( 19 ) which is tapered into a tip and whose outer contour corresponds to an inner cross section of the distal tubular section ( 2 ) and which is provided with at least one spiral ( 20 ) which connects to the at least one spiral ( 8 ) on the periphery of the distal tubular section ( 2 ) in a flush manner, when the trocar ( 17 ) is fixed in the trocar sleeve ( 1 ) in its correct position,

wherein the trocar ( 17 ) comprises a rod ( 22 ) which connects on a proximal side to the distal end section ( 19 ), said rod having an end-side handle ( 23 ) which is dimensioned such that the handle ( 23 ) projects beyond the trocar sleeve ( 1 ) on the proximal side, when the trocar ( 17 ) is fixed in the trocar sleeve ( 1 ) in its correct position, and

wherein means for fixing the trocar ( 17 ) on the trocar sleeve ( 1 ) are provided on the handle ( 23 ) or on the rod ( 22 ), and a distally directed holding rod ( 16 ) is provided on the handle ( 23 ) and is fastened in a holding arm ( 13 ).