Occlusive devices with spiral struts for treating vascular defects

A medical device expandable from a low-profile configuration to an expanded configuration, the medical device comprising:

• an anchor structure extending circumferentially around an opening;
• a plurality of curved struts coupled to the anchor structure and extending over the opening;
• and
• a plurality of protrusions each having a first end coupled to one of the curved struts and a second free end not coupled to a curved strut or the anchor structure.

A medical device comprising:

• an anchor structure defining an opening;
• a plurality of curved struts, each of the curved struts comprising an outer end region coupled to the anchor structure and an inner end region opposite the outer end region such that with the medical device in a deployed configuration the plurality of curved struts extend over the opening;
• and
• a plurality of protrusions each comprising a free first end not coupled to a curved strut and a second end that is coupled to a respective curved strut at a position between the outer end region and the inner end region of the curved strut.

A medical device comprising:

• a ring-shaped structure defining an opening;
• a plurality of curved struts, each of the curved struts having a first end region coupled to the ring-shaped structure and configured such that, with the medical device in an expanded configuration, the curved struts extend radially inward over the opening;
• and
• a plurality of protrusions each extending away from a respective curved strut, each protrusion comprising a free end that is not coupled to a curved strut or the ring-shaped structure.