| 主权项 |
1. A filter for a body lumen, comprising:
an axial member having a first end, a second end, and a center axis between the first and second ends, a first set of expandable legs, each leg of the first set of legs having an inner end coupled to the axial member and a free outer end configured to be disposed radially outward from the axial member when the first set of legs is expanded, and an outer portion adjacent the outer end, the outer portion forming a curve oriented such that the outer portion curves back toward the axial member when the first set of legs is expanded, a second set of expandable legs, each leg of the second set of legs having an inner end coupled to the axial member and a free outer end configured to be disposed radially outward from the axial member when the second set of legs is expanded, and an outer portion adjacent the outer end, the outer portion forming a curve oriented such that the outer portion curves back toward the axial member when the second set of legs is expanded, wherein each leg comprises, a first substantially straight member coupled to the axial member, and a second substantially straight member coupled to the outer portion and the first substantially straight member, such that, when the legs are expanded, an inner surface of the first substantially straight member and an inner surface of the second substantially straight member define an angle of less than 180 degrees and an outer surface of the axial member and an outer surface of the first substantially straight member define an acute angle; and wherein the first and second sets of legs are circumferentially offset mirror images of each other.
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