Aneurysm occlusion system and method
An aneurysm occlusion system includes a device positionable within a cerebral blood vessel covering a neck of an aneurysm on the blood vessel. The device includes an expandable tubular element having a lumen surrounded by a sidewall including a plurality of gaps. When expanded, the tubular element includes longitudinal standards arrayed helically in a proximal to distal direction. The standards support struts and the gaps are defined between adjacent struts and are sufficiently large to permit delivery of embolic coils or other embolic materials therethrough.
1. An intravascular device comprising:
a tubular element that is radially expandable from a compressed profile configuration to an expanded configuration, said tubular element comprising a wall, a proximal end, a distal end and a central portion therebetween;
the tubular element further comprising at least two shape set twisted elongate standards extending in a helical fashion along the wall from the proximal end to the distal end when the tubular element is in the expanded configuration; and
the tubular element further comprising:
(i) a first plurality of V-shaped bands, each band including at least one end connected to a first elongate standard and a second end connected to another elongate standard, wherein the first elongate standard, the other elongate standard, and the first plurality of bands together define a first helical spine, wherein axially adjacent V-shaped bands are separated by a gap and at least some of the axially adjacent V-shaped bands are connected by S-shaped connecting members; and
(ii) a second plurality of V-shaped bands, each band including at least one end connected to a second elongate standard and a second end connected to another elongate standard, wherein the second elongate standard, the other elongate standard, and the second plurality of bands together define a second helical spine, wherein axially adjacent V-shaped bands are separated by a gap and at least some of the axially adjacent V-shaped bands are connected by S-shaped connecting members.
2. The intravascular device according to claim 1 wherein at the proximal end, a first standard is disposed along a first side of the wall, and a second standard is disposed along an opposing side of the wall, and near the distal end, the first standard crisscrosses the second standard.
3. The intravascular device according to claim 1 wherein when said device is in said expanded configuration, said tubular element comprises a generally oval cross section near said proximal end and said distal end, and a generally circular cross section near said central portion.
4. The intravascular device according to claim 1 wherein at least some of said V-shape bands of the first and second pluralities of bands comprise an apex disposed between said one end and a second end of said band, whereby said band can flex at said apex.
5. The intravascular device according to claim 1 wherein said V shaped-bands comprise further comprise S shaped connecting-members, and-said S-shaped connecting members are disposed near said apexes, but not upon said apexes.
6. The intravascular device according to claim 1 wherein said tubular element is cut from a length of tubing according to a repeating pattern of bands and gaps between bands, and wherein in said pattern, the elongate standards extend parallel to one another from the proximal end to the distal end.
7. The intravascular device according to claim 1 wherein said tubular element has a longitudinal axis and at the least two elongate standards are oriented in opposite directions at angles of between 15° and 45° to said longitudinal axis when said tubular element is in said expanded configuration.
8. The intravascular device according to claim 1 wherein in addition to said first and second helical spines, said wall is defined by said bands and said at least one gap between said bands.
9. The intravascular device according to claim 1 , wherein when said device is in said expanded configuration, said wall comprises a plurality of gaps between said first legs and said second legs, wherein said gaps between said first legs comprise a first size, and said gaps between said second legs comprise a second size that is larger than said first size.