Spiral occluding device with an occlusion sail
View Patent ↗An occluding device designed for occlusion of fluid flow through a body cavity is disclosed. The device comprises a coil having a proximal portion and a distal portion extending longitudinally from the proximal portion. The coil has an initial tension along the distal and proximal portions and is configured have a general helical shape in an expanded state. The device further comprises a first set of fibers attached to the coil and extending therefrom for occlusion of the body cavity. The device further comprises a second set of fibers attached to the coil at a plurality of areas longitudinally along the coil, defining an occlusion sail disposed longitudinally along the coil at the plurality of areas therealong. The second set of fibers is configured have the general helical shape when the coil is in the expanded state for enhanced occlusion of the body cavity.
1. An occluding device for occlusion of a body cavity, the device comprising:
a primary coil having a proximal end, a proximal portion, a distal portion, and a distal end, the proximal portion extending longitudinally from the proximal end to the distal portion, the distal portion extending longitudinally from the proximal portion to the distal end, the primary coil having an initial tension along the distal and proximal portions and being configured to form a secondary coil having a general helical shape in an expanded state;
a set of first fibers attached to the primary coil and extending therefrom for occlusion of the body cavity along at least the distal portion of the primary coil; and
a set of second fibers attached to the primary coil at a plurality of areas longitudinally along the primary coil at radially outer locations of the secondary coil, the set of second fibers comprising a plurality of strands, each strand of the set of second fibers being at least twice as long as each of the first fibers and attached to the primary coil at a plurality of longitudinal locations along the primary coil and extending longitudinally along the primary coil substantially from the proximal end of the coil to the distal end of the coil, the set of second fibers defining an occlusion sail disposed longitudinally along the primary coil, the set of second fibers being configured to follow the general helical shape of the secondary coil when the coil is in the expanded state for enhanced occlusion of the body cavity.
2. The device of claim 1 wherein the secondary coil has a series of loops axially spaced apart by up to about 5 millimeters curl space.
3. The device of claim 2 wherein the secondary coil has a variable outside diameter, the variable outside diameter being configured to proximally flare along the length of the proximal portion.
4. The device of claim 1 wherein the initial tension is between about 5 and 120 grams of weight.
5. The device of claim 2 wherein the secondary coil has a variable outside diameter configured to proximally taper along the length of the proximal portion.
6. The device of claim 1 wherein the primary coil has a tensile strength of between about 50,000 and 400,000 pounds per square inch.
7. The device of claim 1 wherein the primary coil has a length of between about 3 and 20 centimeters and wherein the occlusion sail has a length of between about 3 and 20 centimeters.
8. The device of claim 1 wherein the fibers are made of a synthetic polyester textile fiber.
9. The device of claim 1 wherein the secondary coil has a series of loops, the set of first fibers and the set of second fibers including strands attached to the series of loops.
10. The device of claim 9 wherein each of the strands of the set of second fibers has a length of between about 3 to 20 centimeters and has an outer diameter of about 0.00050 to 0.00100 inch.
11. The device of claim 1 , wherein the set of second fibers is loosely attached to the coil, such that the set of second fibers increases a cross-sectional profile of the device in the expanded state by a greater amount than in a collapsed state.