VASO-OCCLUSIVE DEVICE
A vaso-occlusive device comprises an elongate vaso-occlusive structure configured for implantation in an aneurysm sac. The vaso-occlusive structure has a delivery configuration when restrained within a delivery catheter and has a deployed configuration when released from the delivery catheter into the aneurysmal sac. At least a portion of the vaso-occlusive device is composed of a gold-platinum (AuPt) alloy.
1 . A vaso-occlusive device, comprising:
an elongate vaso-occlusive structure configured for implantation in an aneurysm sac, the vaso-occlusive structure having a delivery configuration when restrained within a delivery catheter and having a deployed configuration when released from the delivery catheter into the aneurysmal sac, at least a portion of the vaso-occlusive structure being composed of a gold-platinum (AuPt) alloy.
2 . The vaso-occlusive device of claim 1 , wherein the AuPt alloy comprises platinum within the range 25%-40% by weight.
3 . The vaso-occlusive device of claim 1 , wherein the AuPt alloy has a Young's modulus less than 25×10 6 pounds per square inch (psi).
4 . The vaso-occlusive device of claim 1 , wherein the vaso-occlusive structure comprises a mesh portion composed of the AuPt alloy.
5 . The vaso-occlusive device of claim 4 , wherein the mesh portion is a braided portion.
6 . The vaso-occlusive device of claim 4 , wherein the entirety of the vaso-occlusive structure comprises the mesh portion.
7 . The vaso-occlusive device of claim 4 , wherein the vaso-occlusive structure further comprises two helically wound coil portions disposed at opposite ends of the mesh portion.
8 . The vaso-occlusive device of claim 7 , wherein each of the two helically wound coil portions is composed of the AuPt alloy.
9 . The vaso-occlusive device of claim 4 , wherein the mesh portion comprises at least one wire, each having a minimum cross-sectional dimension in the range of 0.0008″-0.004″.
10 . The vaso-occlusive device of claim 4 , wherein the mesh portion comprises at least one twisted strand.
11 . The vaso-occlusive device of claim 4 , wherein the mesh portion has a wire count in the range of 8-96 wires.
12 . The vaso-occlusive device of claim 4 , wherein the mesh portion has a wire count in the range of 16-32 wires.
13 . The vaso-occlusive device of claim 4 , wherein the mesh portion has an unconstrained braid angle in the range of 20°-60°.
14 . The vaso-occlusive device of claim 1 , wherein the mesh portion has an expanded geometry having a circular cross-section.
15 . The vaso-occlusive device of claim 1 , wherein the mesh portion has an expanded geometry having a rectangular cross-section.
16 . The vaso-occlusive device of claim 15 , wherein the rectangular cross-section has a width in the range of 1.0 mm-2.0 mm.
17 . The vaso-occlusive device of claim 15 , wherein the mesh portion has a bending stiffness less than 150 mN/mm.
18 . The vaso-occlusive device of claim 1 , wherein the vaso-occlusive structure is further composed of one or both of Iridium and Tungsten.
19 . A vaso-occlusive assembly, comprising:
the vaso-occlusive device of claim 1 ; and
a pusher member to which the vaso-occlusive device is detachably coupled.
20 . A vaso-occlusive treatment system, comprising:
a vaso-occlusive assembly of claim 19 ; and
the delivery catheter in which the vaso-occlusive assembly is disposed.