Stent
In one embodiment according to the present invention, a stent is described having a generally cylindrical body formed from a single woven nitinol wire. The distal and proximal ends of the stent include a plurality of loops, some of which include marker members used for visualizing the position of the stent. In another embodiment, the previously described stent includes an inner flow diverting layer.
1 . An implant device comprising:
a first layer having a first porosity;
a second layer disposed at least partially over said first layer and having a second porosity, said second porosity being higher than said first porosity.
2 . The implant device of claim 1 , wherein said first layer has a tubular shape.
3 . The implant device of claim 1 , wherein said first layer is woven from wire having a first diameter and said second layer is woven from wire having a second diameter; said first diameter being smaller than said second diameter.
4 . The implant device of claim 1 , wherein said first layer and said second layer are connected near a proximal end of said implant device.
5 . The implant device of claim 1 , wherein said second layer comprises a plurality of wires forming a woven, tubular structure.
6 . The implant device of claim 1 , wherein said implant device is deployable with between about 10-50% of the force necessary to deploy a single layer flow diverting device.
7 . The implant device of claim 1 , wherein said implant device is deployable with between about 0.2 and about 0.6 lbs of force.
8 . The implant device of claim 1 , wherein said first layer has a porosity between about 45-70%.
9 . The implant device of claim 1 , wherein a proximal end of said second layer comprises a plurality of loops.
10 . The implant device of claim 1 , wherein said first layer is composed of at least a first wire having a diameter between about 0.0005 to about 0.0018 inch and said second layer is composed of at least a second wire between about 0.0018 inch and about 0.0050 inch.
11 . The implant device of claim 1 , wherein said first layer is composed of one or more first wires and said second layer is composed of one or more second wires; and wherein the diameter size ration between said first wires and said second wires is between about 1:1 and about 1:10 respectively.
12 . The implant device of claim 1 , wherein said second layer is between about 0.1 mm and about 0.6 mm larger in diameter than said first layer when said implant device is in an expanded configuration.
13 . The implant device of claim 1 , wherein said second layer has a distal region, a proximal region and a middle region disposed between said distal end and said proximal end; and wherein said middle region has a smaller thickness than said proximal region and said distal region.
14 . The implant device of claim 1 , wherein said second layer has a distal region, a proximal region and a middle region disposed between said distal end and said proximal end; and wherein said middle region is between about 0.0003 inch and about 0.001 inch smaller than said distal end and said proximal end.
15 . The implant device of claim 1 , wherein said second layer has a distal region, a proximal region and a middle region disposed between said distal end and said proximal end; and wherein said middle region is between about 20% to about 30% smaller than said distal end and said proximal end.
16 . The implant device of claim 1 , wherein said implant device further comprises hydrogel.
17 . The implant device of claim 1 , wherein said second layer comprises a segment woven from a single wire.
18 . The implant device of claim 1 , wherein said second layer comprises a nonwoven tubular shape.
19 . The implant device of claim 1 , wherein said first layer decreases in length at a different rate than said second layer during radial expansion.
20 . The implant device of claim 1 , wherein said first layer increases or decreases in length independently of said second layer.
21 . The implant device of claim 1 , wherein the average radial force of the implant device is greater than or equal to the average radial force independent exerted by the first layer and the second layer combined.