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A vascular device movable from a collapsed insertion position having a first diameter to a first expanded position and further movable to a second expanded position having a second diameter larger than the first diameter. A plurality of vessel engaging members extend outwardly from the device for se

A vascular device movable from a collapsed insertion position having a first diameter to a first expanded position and further movable to a second expanded position having a second diameter larger than the first diameter. A plurality of vessel engaging members extend outwardly from the device for securing the internal wall of a vessel upon expansion of the device to the second expanded position. The vessel engaging members pull the internal wall of the vessel radially inwardly upon movement of the device from the second expanded position toward the first expanded position having a third diameter greater than the first diameter and less than the second diameter.

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1. A vascular device comprising a proximal portion, an intermediate portion, a distal portion, and a plurality of vessel engaging members, the device movable from a collapsed insertion position having a first diameter to a second expanded position having a second diameter larger than the first diame

1. A vascular device comprising a proximal portion, an intermediate portion, a distal portion, and a plurality of vessel engaging members, the device movable from a collapsed insertion position having a first diameter to a second expanded position having a second diameter larger than the first diameter, the plurality of vessel engaging members extending outwardly from the device for securely engaging the internal wall of a vessel upon expansion of the device to the second expanded position, the vessel engaging members pulling the internal wall of the vessel radially inwardly upon movement of the device from the second expanded position toward a first expanded position having a third diameter, the third diameter being greater than the first diameter and less than the second diameter. 2. The vascular device of claim 1, wherein the device is composed of shape memory material and the first expanded position substantially corresponds to a memorized position of the device. 3. The vascular device of claim 1, wherein the device is composed of shape memory material and is initially movable from the collapsed position to the first expanded position in response to exposure to body temperature, and is subsequently moved from the first expanded position to the second expanded position by an expandable member. 4. The vascular device of claim 1, wherein the device is composed of shape memory material and is movable from the collapsed position to the second expanded position by substantial simultaneous exposure to body temperature and expansion by an expandable member. 5. The vascular device of claim 2, wherein the device returns to the memorized position in response to exposure to body temperature. 6. The vascular device of claim 1, wherein the device is expanded to the second expanded position by mechanical means positioned within the device. 7. The vascular device of claim 1, wherein the device is moved to the second expanded position by expansion of a balloon positioned within the device. 8. The vascular device of claim 1, wherein the vessel engaging members have sharp ends and extend from the distal portion and from the proximal portion of the device. 9. The vascular device of claim 8, wherein each of the vessel engaging members includes a barb, the sharp ends limiting axial movement of the vessel wall and the barb limiting radial movement of the vessel wall to enhance retention of the vessel. 10. The vascular device of claim 1, wherein in the collapsed position the intermediate portion includes a plurality of longitudinal strips with a gap between adjacent strips, the vessel engaging members being formed by respective cuts in the longitudinal strips, the longitudinal strips buckling radially outwardly upon expansion of the device. 11. The vascular device of claim 1, wherein the vessel engaging members extend from the proximal portion and the distal portion and include hooks, the hooks extending substantially parallel to a longitudinal axis of the device in the collapsed position and substantially perpendicular to the longitudinal axis in the expanded position. 12. The vascular device of claim 1, wherein the device includes a plurality of longitudinal strips, each of the longitudinal strips terminating at opposing ends in one of the vessel engaging members. 13. The vascular device of claim 12, further comprising a substantially straight slot formed in each of the longitudinal strips in the collapsed position of the device, each slot transforming to a substantially diamond shape when the device is moved to the first expanded position. 14. The vascular device of claim 13, wherein each of the vessel engaging members includes a sharp penetrating tip and a barb. 15. The vascular device claim 14, wherein the longitudinal strips are connected by transverse ribs, the ribs being in substantial axial alignment.