Ballstent device and methods of use
What is disclosed are medical devices comprising a rounded, thin-walled, expandable metal structure (“ballstent”) and a flexible, elongated delivery device (“delivery catheter”) and systems and methods of use for treating saccular vascular aneurysms with the medical devices. Ballstents comprised of gold, platinum, or silver that can be compressed, positioned in the lumen of an aneurysm, and expanded to conform to the shape of the aneurysm are disclosed. The external surface of ballstents can be configured to promote local thrombosis and to promote the growth of tissue into and around the wall of the ballstent in order to seal the aneurysm and fix the ballstent in place in the aneurysm. The wall of the ballstent can also be configured to release drugs or pharmacologically active molecules, such as those that promote thrombosis, cell proliferation, extracellular matrix deposition, and tissue growth.
1. A medical device for occluding a saccular aneurysm, the medical device comprising:
a compressed, hollow structure, wherein the hollow structure, when expanded, assumes a generally rounded form, comprises a single lobe having a wall with an interior surface defining a void and an exterior surface, with an opening in the wall that allows for the passage of fluid into the void, the wall comprising a polymer layer and a metal layer;
wherein the passage of fluid into the void of the compressed hollow structure results in expansion of the hollow structure; and
wherein the expanded hollow structure has sufficient rigidity to remain in an expanded state and implanted in vivo in an unsealed and valveless configuration.
2. The medical device of claim 1 , wherein the expanded hollow structure is not supported by a rigid or semi rigid material inside the void of the expanded hollow structure.
3. The medical device of claim 1 , wherein the thickness of the polymer layer is between 0.1 μm and 59 μm.
4. The medical device of claim 1 , wherein the thickness of the metal layer is between 5 μm and 20 μm.
5. The medical device of claim 1 , wherein the total thickness of the wall is between 2 μm and 60 μm.
6. The medical device of claim 1 , wherein the polymer layer is external to the metal layer.
7. The medical device of claim 1 , wherein the polymer layer is internal to the metal layer.
8. The medical device of claim 1 , wherein the hollow structure has an expanded diameter ranging from 2 mm to 20 mm.
9. The medical device of claim 1 , wherein the exterior surface of the hollow structure comprises microscopic projections.
10. The medical device of claim 1 , wherein the exterior surface of the hollow structure is porous.
11. The medical device of claim 1 , wherein the hollow structure comprises one or both of a proximal neck and a distal neck.
12. The medical device of claim 11 , wherein the hollow structure comprises both a proximal neck and a distal neck and both the proximal neck and the distal neck of the hollow structure project away from a body of the hollow structure.
13. The medical device of claim 1 , wherein the metal layer is annealed.
14. The medical device of claim 1 , wherein a radiopaque marker band or spot is incorporated into the medical device.
15. The medical device of claim 1 , wherein the compressed hollow structure can be expanded by injection of a fluid comprising water or saline into the void of the hollow structure at a pressure less than 5 atmospheres.
16. The medical device of claim 1 , further comprising a catheter or a catheter assembly.
17. The medical device of claim 16 , wherein the hollow structure is attached to the catheter or catheter assembly by an adhesive, or glue.
18. The medical device of claim 16 , wherein a radiopaque marker band or spot is incorporated into the medical device to identify the distal end of the catheter or catheter assembly.
19. The medical device of claim 1 , wherein the length of the catheter or catheter assembly is 75-225 cm.
20. The medical device of claim 1 , wherein the wall of the catheter or catheter assembly is reinforced with wound or braided wire.