Occluder devices

An occlusion system comprising: a delivery catheter having a proximal end, a distal end, a proximal portion, and a distal portion; and an occlusion device coupled to the delivery catheter with the occlusion device in a reduced profile delivery configuration, the occlusion device including: a barrier member including a radially enlargeable portion and having a first length defining a first lumen, a tail portion extending from the enlargeable portion and having a second length defining a second lumen in communication with the first lumen, an anchor feature arranged with the enlargeable portion of the barrier member, wherein the first lumen extends through the enlargeable portion and the anchor feature and is configured to receive the delivery catheter, the enlargeable portion and the tail portion being releasably coupled to the catheter such that the tail portion is radially unsupported and the second lumen is collapsible upon deployment from the delivery catheter. 18501079_1 (GHMatters) P114469.AU.1