Patent ID: 8252022

Claim:
A closure device to be inserted at least partially through a blood vessel wall aperture in a blood vessel wall, the blood vessel having a lumen, the closure device comprising: at least two parts, including an internal part and an external part, the internal part being adapted to be extended at least partially through the blood vessel wall aperture and into the lumen to at least partially block the blood vessel wall aperture, each of the internal part and the external part consisting essentially of a metal that biodegrades within a living being in a period of time that permits biological repair of the blood vessel wall in and around the blood vessel wall and at least the external part being structurally separate and movable relative to the internal part; and the closure device incorporating a buffer as part of the closure device whereby pH near at least part of the closure device is affected and whereby biodegradation of at least part the closure device in a desired time is facilitated.