An occlusion device (10) for an atrial appendage has proximal and distal ends (12, 14) and a central axis and comprises a cage-like structure formed of struts. The struts have proximal strut ends and distal strut ends. At the proximal end (12) of the device (10), the struts extend towards the central axis and are connected to each other at their proximal strut ends. At the distal end (14) of the device, at least some of the struts extend toward the central axis and are connected to each other at their distal strut ends by a tube into which the distal strut ends are inserted or by a collar comprising several openings for receiving the distal strut ends. The device (10) further comprises a threaded insert at the proximal end.