Taming the "cobra": an approach to "cobra-like" formation seen in the Occlutech atrial septal defect and patent foramen ovale occluders.

Percutaneous closure of secundum atrial septal defect and patent foramen ovale has gained widespread use in recent years. We present a small series of four cases in which a "cobra-like" formation occurred in an Occlutech Figulla device during the deployment of the left disk, and propose a technique that may resolve this problem.