Endovascular Closure System

A method of treating an aneurysm in a patient's brain, extending from a root blood vessel, comprising:

• a. providing an aneurysm closure device, that includes:
• i. a pair of retention clips, joined together;
• ii. each said clip having an aneurysm anchor coupled to a root-vessel anchor, and being made of material having a resilient installed state, in which said aneurysm anchor and said root-vessel anchor are urged together, thereby squeezing and being retained by any interposed material;
• and
• iii. an aneurysm seal, bridging said clips;
• b. implanting said aneurysm closure device so that it seals said aneurysm by positioning said aneurysm anchors in opposed positions inside said aneurysm and said root vessel anchors inside said root blood vessel so that each said aneurysm anchor is urged toward its coupled root-vessel anchor, thereby retaining said aneurysm closure device by pressure placed by said clips on said interposed aneurysm and root vessel tissue, and thereby placing said seal over said aneurysm, reducing blood flow to said aneurysm and causing eventual atrophy of said aneurysm.