Patent ID: 8915952

Claim:
A mechanically expandable device for treating a bifurcation or trifurcation aneurysm, the aneurysm having an aneurysm neck, the device comprising: a generally tubular structure having a proximal end, a distal end, and an exterior surface defined by a plurality of interconnected struts forming a series of peaks and valleys having interstitial spaces therebetween, said generally tubular structure expandable from a first position to a second position, and said tubular structure is configured to expand radially outwardly to the second position such that the exterior surface of said structure engages with the inner surface of a bifurcation or trifurcation branch so as to maintain a fluid pathway through said branch and to constrict the aneurysm neck such that blood circulation to the aneurysm is reduced; wherein, in the second position, the tubular structure has a cylindrical portion and a tapered portion, the cylindrical portion having a substantially uniform diameter along its longitudinal length, the tapered portion flaring outwardly from the cylindrical portion to the proximal end of the tubular structure, the cylindrical portion comprising a plurality of rings interconnected by a plurality of interconnecting struts, the tapered portion comprising a distalmost ring, a proximalmost ring, and a distal interconnecting strut extending between a peak of the distalmost ring and a valley of the proximalmost ring, the proximalmost ring having a longer longitudinal length than any of the rings in the cylindrical portion, the distal interconnecting strut having a longer longitudinal length than any of the interconnecting struts in the cylindrical portion, and each of the plurality of rings in the cylindrical portion, the distalmost ring, and the proximalmost ring encircling a longitudinal axis of the tubular structure.