NEUROVASCULAR OCCLUSION DEVICE
A neurovascular occlusion device for occluding a vessel and a delivery system for delivering the occlusion device. The occlusion device can include a self-expandable support structure defining a concave occlusive component and an anchoring component separated by a neck component. The occlusive component can carry a functionally occlusive membrane configured to prevent substantially all fluid from flowing past the occlusion device when the occlusion device is expanded in the vessel.
1 . A neurovascular occlusion device for occluding blood flow in a vessel, comprising:
a support structure, self-expandable from a reduced cross-section for transluminal navigation to an enlarged cross-section for occluding a vessel, the support structure defining a concave occlusive component and an anchoring component separated by a neck component, the anchoring component comprising a ring of cells, the ring of cells comprising a first cell and a circumferentially adjacent second cell, a length of the first cell in a longitudinal direction being greater than a length of the second cell in the longitudinal direction, the neck component comprising a cell having an open area spanning the neck component; and
a functionally occlusive membrane without a guidewire lumen and carried by the concave occlusive component;
wherein a first ratio of wall space to open area in the neck component is less than a second ratio of wall space to open area in the concave occlusive component or the anchoring component.
2 . The neurovascular occlusion device of claim 1 , wherein the ring of cells comprises a third cell circumferentially adjacent the second cell, the length of the second cell in the longitudinal direction being shorter than a length of the third cell in the longitudinal direction.
3 . The neurovascular occlusion device of claim 1 , wherein the occlusive component comprises at least one ring of cells, each cell in the at least one ring having a same length.
4 . The neurovascular occlusion device of claim 1 , wherein each cell includes nodes, the nodes of each of the cells closest to the neck component are longitudinally aligned with each other.
5 . The neurovascular occlusion device of claim 1 , wherein the anchoring component is concave in a direction away from the concave occlusive component.
6 . The neurovascular occlusion device of claim 1 , wherein the support structure has an expansion ratio of at least about 8:1.
7 . The neurovascular occlusion device of claim 1 , wherein the functionally occlusive membrane is configured to prevent at least 90% of fluid flow from flowing past the occlusion device at 120 mmHg pressure.
8 . The neurovascular occlusion device of claim 1 , further comprising elongate markers positioned at a proximal end and/or a distal end of the occlusion device, a major axis of the elongate markers extending in a longitudinal direction of the occlusion device.
9 . The neurovascular occlusion device of claim 8 , wherein the elongate markers are rectangular.
10 . A neurovascular occlusion device for occluding blood flow in a vessel, comprising:
a support structure, self-expandable from a reduced cross-section for transluminal navigation to an enlarged cross-section for occluding a vessel, the support structure defining a concave occlusive component and an anchoring component separated by a neck component; the anchoring component comprising a ring of cells, each cell comprising a node that is closest to the neck component, the nodes being staggered such that each node is circumferentially and longitudinally offset from the node of a circumferentially adjacent cell and alternating nodes are longitudinally aligned with each other,
a functionally occlusive membrane without a guidewire lumen and carried by the occlusive component;
wherein the neck component comprises a cell having a first open area, extending from the concave occlusive component to the anchoring component, the first open area being greater than an open area of each cell of the ring of cells.
11 . The neurovascular occlusion device of claim 10 , wherein the concave occlusive component comprises a ring of cells, each cell comprising a node closest to the neck component, the nodes being longitudinally aligned with each other.
12 . The neurovascular occlusion device of claim 10 , wherein the functionally occlusive membrane is configured to prevent more than 90% of fluid from flowing past the occlusion device at 120 mmHg pressure within three minutes.
13 . The neurovascular occlusion device of claim 12 , wherein the functionally occlusive membrane is porous and has no openings that are greater than a pore size of about 0.2 mm.
14 . The neurovascular occlusion device of claim 12 , wherein the functionally occlusive membrane has a same thickness along a length of the occlusive membrane.
15 . The neurovascular occlusion device of claim 10 , wherein the functionally occlusive membrane comprises a region of curvature having a first number of layers and a cylindrical region having a second number of layers, the second number of layers of the cylindrical region being greater than the first number of layers of the region of curvature.
16 . The neurovascular occlusion device of claim 12 , wherein the functionally occlusive membrane comprises a region of curvature and a cylindrical region, a thickness of the region of curvature being greater than a thickness of the cylindrical region.
17 . The neurovascular occlusion device of claim 12 , wherein a thickness of the functionally occlusive membrane is no greater than about 30 microns.
18 . The neurovascular occlusion device of claim 10 , wherein the anchoring component is concave in a direction away from the concave occlusive component.
19 . The neurovascular occlusion device of claim 10 , wherein the first open area is greater than an open area of each cell in the anchoring component.
20 . The neurovascular occlusion device of claim 1 , wherein the functionally occlusive membrane is applied to an interior of the support structure and an exterior of the support structure.
21 . The neurovascular occlusion device of claim 1 , wherein the functionally occlusive membrane covers each cell in the concave occlusive component.