An occluding device for closing a body passage comprises an occluding body (1), a first position control element (2) and a second position control element (3). The occluding body (1) is a balloon made of a flexible and fluid tight material without shape memory property. The occluding body (1) comprises a proximal chamber (10) and a distal chamber (11) and a connecting Channel (12) connecting these two chambers (10, 11). The occluding body (1) is compressible into a first longitudinal shape. A proximal end of the occluding body (1) is attached to the first position control element (2) and the distal end of the balloon is attached to the second position control element (3). The first position control element (2) and the second position control element (3) are two matching parts of a fluid tight closure of the balloon. No additional stiffening means for stiffening the balloon in its third radially extended but longitudinally compressed State are arranged within the occluding body (1).
