Patent ID: 8529596

Claim:
An embolic obstruction 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 within a vessel of a patient, the self-expandable member comprising a plurality of generally longitudinal undulating elements with adjacent undulating elements being interconnected in a manner to form a plurality of diagonally disposed cell structures, 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, the proximal end portion having a plurality of outer-most cell structures that include outer-most wall segments that form first and second rail segments that each extend from a position at or near a proximal-most end of the self-expandable member to a position at or near the elongate cylindrical main body portion, a proximal-most cell structure of the proximal end portion comprising first and second outer struts that extend distally from a proximal antenna, when the self-expandable member is cut and laid flat on a surface at least a portion of each of the first and second outer struts comprise a straight segment, each of the straight segments being coextensive with the proximal antenna, the proximal-most cell structure being a closed four-sided structure when the self-expandable member is cut and laid flat on a surface, the closed four-sided structure comprising the first outer strut, the second outer strut, a first inner strut and a second inner strut, the first inner strut extending distally from the first outer strut, the second inner strut extending distally from the second outer strut, when the self-expandable member is cut and laid flat on a surface all or substantially all of the first and second inner struts are curvilinear.