Patent ID: 8118859

Claim:
An occlusion device for occluding at least a portion of a body vessel in a human subject, comprising: a generally tubular support member radially expandable from a compressed condition to an expanded condition for occlusion action within a body vessel, wherein the support member has a porosity in at least the expanded condition; a generally tubular screen member associated with at least a portion of the support member and radially and circumferentially expandable from a radially and circumferentially compressed condition to a radially and circumferentially expanded condition with the support member, further comprising a plurality of parallelogram-shaped openings in the compressed condition, and wherein the screen member is a thin-film mesh from which the parallelogram-shaped openings had been cut to be circumferentially adjacent to each other and are in a common cylindrical plane, and the screen member has a porosity in the expanded condition less than the porosity of the support member in the expanded condition; each said opening is defined by a pair of upwardly inclined parallel edges directly intersecting a pair of downwardly inclined parallel edges wherein upwardly inclined and downwardly inclined designate a general relationship with respect to the longitudinal axis of the screen member, and, wherein one of the pairs of parallel edges is at least about 1.5 times longer than the other one of the pairs of parallel edges, and adjacent directly intersecting edges define an as-manufactured opening angle that is between about 5 and about 30 degrees; and respective lowermost ends of adjacent upwardly inclined and downwardly inclined parallel edges of the opening directly engage each other to directly define a vertex that joins said opening with an adjacent opening offset therefrom in that the vertex is at a location spaced away from and between the ends of a said longer edge of the adjacent opening, whereby openings of adjacent rows of openings are axially offset from each other within the common cylindrical plane such that the openings from adjacent rows are not in circumferential alignment with each other.