Patent ID: 8357179

Claim:
A clot retrieval device comprising: an elongate self-expandable member expandable from a first delivery position to a second position, in the first delivery position the self-expandable member being in an unexpanded position and having a first nominal diameter and in the second position the self-expandable member being in a radially expanded position and having a second nominal diameter greater than the first nominal diameter for deployment within an embolic obstruction of a patient, the self-expandable member cut from a tube to comprise a plurality of generally longitudinal undulating elements with adjacent undulating elements being interconnected in a manner to form a plurality of cell structures with substantially all of adjacent cell structures in the self-expandable member being disposed diagonally with respect to one another, the self-expandable member having a proximal end portion and an elongate cylindrical main body portion, the cell structures in the elongate cylindrical main body portion extending circumferentially around a longitudinal axis of the self-expandable member, the cell structures in the proximal end portion extending less than circumferentially around the longitudinal axis of the self-expandable member to form first and second peripheral rails having proximal and distal end segments, the cell structures in the proximal end portion comprising a first set of cell structures arranged to form the first peripheral rail, a second set of cell structures arranged to form the second peripheral rail and a third set of cell structures comprising one or more cell structures located between the first and second set of cell structures, the first and second set of cell structures having in common a proximal-most cell structure, the cell structures in the elongate cylindrical main body portion comprising a fourth set of cell structures, the first set of cell structures having circumferential outer-most strut members that define the first peripheral rail, the second set of cell structures having circumferential outer-most strut members that define the second peripheral rail, at least some of the circumferential outer-most strut members of the first set and the second set of cell structures having different width dimensions and arranged so that the first and second peripheral rails vary between a first width dimension at the proximal end segment to a second width dimension at the distal end segment, the second width dimension less than the first width dimension.