Occluder devices for occluding an anatomical aperture, such as an atrial septal defect (ASD) or a patent foramen ovale (PFO) comprise two sides connected by a central tube. The occluder devices are formed from a tube, which is cut to produce struts in each side. Upon the application of force, the struts deform into loops. The loops may be of various shapes, sizes, and configurations, and, in at least some embodiments, the loops have rounded peripheries. In some embodiments, at least one of the sides includes a tissue scaffold. The occluder devices include a catch system that maintains its deployed state in vivo. When an occluder device is deployed in vivo, the two sides are disposed on opposite sides of the septal tissue surrounding the aperture and the catch system is deployed so that the occluder device exerts a compressive force on the septal tissue and closes the aperture.