Occluder and anastomosis devices

A medical device comprising:

• a frame comprising an elongate member, said elongate member defining:
• an apposition portion;
• a sealing portion;
• and
• a defect-occupying portion defined by a plurality of discrete sections of the elongate member disposed between said apposition portion and said sealing portion forming a passage between the apposition portion and the sealing portion unobstructed by the frame on either side of the passage, the defect-occupying portion defining an outwardly tapered profile at each of the apposition and sealing portions to define curved transitions between the apposition portion and the sealing portion, and
• a covering material disposed on at least a portion of said sealing portion,
• wherein said apposition portion contains a plurality of apposition petals,
• wherein said sealing portion contains a plurality of sealing petals abutting each other along a length of the apposition petals extending radially outward from the defect-occupying portion,
• wherein said apposition petals are configured to move independently of each other,
• wherein said sealing petals abut each other and create a sealing edge, and
• wherein said apposition petals and said sealing petals have a pre-strained geometry such that an apposition force exists in the absence of a tissue layer, and wherein the apposition petals are aligned over the sealing petals such that the apposition petals are symmetrical with the sealing petals.