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An occlusion device for implantation within a body vessel is provided with a screen member and an associated support member. The occlusion device is radially expandable from a compressed condition, suitable for inserting the device in an introducer, to a deployed or expanded condition within a vesse

An occlusion device for implantation within a body vessel is provided with a screen member and an associated support member. The occlusion device is radially expandable from a compressed condition, suitable for inserting the device in an introducer, to a deployed or expanded condition within a vessel. The screen member includes a plurality of substantially parallelogram-shaped openings in the compressed condition arranged in longitudinal rows, the openings being axially offset from each other. The porosity of the screen member is less than the porosity of the support member in the expanded condition.

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1. 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

1. 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; andrespective 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. 2. The occlusion device of claim 1, wherein the screen member overlays at least a portion of the support member. 3. The occlusion device of claim 2, further including an additional screen member having a plurality of parallelogram-shaped openings, and wherein the support member overlays said additional screen member. 4. The occlusion device of claim 1, wherein at least a portion of the screen member is received within the support member. 5. The occlusion device of claim 4, further including an additional support member, and wherein the screen member overlays at least a portion of said additional support member. 6. The occlusion device of claim 1, wherein an edge of the screen member has a generally sinusoidal configuration. 7. The occlusion device of claim 1, wherein said screen member has an opening-to-material ratio falling within the range of approximately 1.5:1 and approximately 4:1. 8. The occlusion device of claim 1, wherein at least one of the parallelogram-shaped openings has an upward attitude and at least one of the parallelogram-shaped openings has a downward attitude. 9. The occlusion device of claim 8, wherein the parallelogram-shaped openings are arranged in longitudinally extending rows, and wherein the parallelogram-shaped openings of adjacent rows have opposite attitudes. 10. The occlusion device of claim 8, wherein the upward attitude and the downward attitude each are at an angle as manufactured that is less than said opening angle of between about 5 and about 30 degrees. 11. The occlusion device of claim 1, wherein the longer edge of the opening is adjacent to part of at least two other openings. 12. 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 at least in the expanded condition;a generally tubular screen member received on 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, said screen member having 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 at an upward attitude and directly intersecting a pair of downwardly inclined parallel edges at a downward attitude, adjacent edges defining an as-manufactured opening angle that is between about 5 and about 30 degrees, 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 twice as long as the other one of the pairs of parallel edges;said upward attitude and downward attitude each are at an angle less than said opening angle of between about 5 degrees and about 30 degrees;said screen member has an opening-to-material ratio falling within the range of approximately 1.5:1 and approximately 4:1; andrespective lowermost ends of adjacent upwardly inclined and downwardly inclined parallel edges of the opening directly engage each other to directly define 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. 13. The occlusion device of claim 12, wherein an edge of the screen member has a generally sinusoidal configuration. 14. 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 attached to 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, the porosity of the screen member being at least about 60%;said openings are 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 intersecting edges define an opening angle;said opening angle as manufactured is between about 5 degrees and about 30 degrees;the parallelogram-shaped openings of the screen member are arranged in rows, and the parallelogram-shaped openings of adjacent rows of the screen member have opposite attitudes; andrespective lowermost ends of adjacent upwardly inclined and downwardly inclined parallel edges of the opening directly engage each other to directly define 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. 15. The occlusion device of claim 14, wherein an edge of the outer screen member has a generally sinusoidal configuration. 16. The occlusion device of claim 14, wherein said screen members each have an opening-to-material ratio falling within the range of approximately 1.5:1 and approximately 4:1. 17. The occlusion device of claim 14, wherein at least one of the parallelogram-shaped openings of the screen member has an upward attitude and at least one of the parallelogram-shaped openings of the screen member has a downward attitude.