The invention relates to a medical device comprising a rotationally symmetrical grid structure (10) having at least two spiral-shaped wire elements (11, 12) which are wound about a common axis of rotation R and which form a first and second intersection S', S", respectively, with a common plane L arranged perpendicularly to the axis of rotation, wherein a first straight line R' runs through the first intersection S' and a second straight line R" runs through the second intersection S". Said straight lines are each arranged parallel to the axis of rotation and include an acute angle (a', a") with one of the two wire elements (11, 12), respectively. The invention is characterized in that the two angles (a', a") are different and the wire elements (11, 12) have different elastic properties.
