Intrasaccular thin-film flow diverters and related methods
An intrasaccular flow diverter includes a wire structure (e.g., a braided wire or a laser-cut hypotube), a thin-film mesh placed over the wire structure, and crimps fixing the thin-film mesh to the wire structure at each crimp. The wire structure and the thin-film mesh between adjacent crimps are expanded radially to form thin-film covered spheroid structures. When deployed in an aneurysm, the spheroid structures may volumetrically fill the aneurysm sac. An intrasaccular flow diverter with an umbrella structure includes a wire structure with a plurality of crimps along the wire structure, and a thin-film covered umbrella structure at one end of the wire structure. The wire structure between adjacent crimps is expanded radially to form a spheroid structure. When deployed in an aneurysm, the thin-film covered umbrella structure may cover the aneurysm neck.
1. An apparatus, comprising:
a device body comprising:
a wire structure comprising a plurality of wires,
a thin-film mesh placed over a length of the wire structure, and
a plurality of crimps configured to secure the thin-film mesh to the wire structure at corresponding crimp locations,
wherein a respective part of the wire structure and a respective part of the thin-film mesh between two adjacent crimps are configured to expand radially to form a thin-film covered spheroid spring, and wherein expanded parts of the thin-film mesh comprises pores;
a first umbrella structure at a proximal end of the wire structure; and
a second umbrella structure at a distal end of the wire structure.
2. The apparatus of claim 1 , wherein the thin-film covered spheroid spring pushes the first umbrella structure and the second umbrella structure outwardly when compressed.
3. The apparatus of claim 1 , wherein the wire structure comprises a braided wire or a laser-cut hypotube, and wherein the first umbrella structure comprises a braided wire or a laser-cut hypotube.
4. The apparatus of claim 1 , wherein the thin-film mesh is a thin-film Nitinol (TFN) micromesh having a thickness of between 1 and 50 micrometers.
5. The apparatus of claim 1 , wherein the thin-film mesh comprises slits having a length between 50 and 200 micrometers prior to expansion, wherein the slits open up to a corresponding diamond-shaped pore in response to expansion, and wherein the expanded thin-film mesh forms struts having a width between 1 to 25 micrometers around each pore.
6. The apparatus of claim 1 , wherein the pore density of the expanded thin-film mesh is between 81 and 1075 pore per mm 2 , and wherein the percent metal coverage of the expanded thin-film mesh is between 19 and 66%.
7. The apparatus of claim 1 , wherein the spheroid spring comprises a spherical spring or an oval spring.
8. The apparatus of claim 1 , wherein the device body is formed from a braided wire, and the first and second umbrella structures are formed from laser-cut hypotubes.
9. The apparatus of claim 1 , wherein the device body, the first umbrella structure, and the second umbrella structure are formed from a single braided wire.
10. The apparatus of claim 1 , wherein the device body, the first umbrella structure, and the second umbrella structure are formed from a single hypotube structure.
11. An apparatus, comprising:
a wire structure comprising a plurality of wires and a plurality of crimps provided along the wire structure at corresponding crimp locations, wherein a respective part of the wire structure between two adjacent crimps is configured to expand radially to form a spheroid spring;
a thin-film covered umbrella structure at a proximal end of the wire structure comprising umbrella struts and a thin-film sheet attached to the umbrella struts; and
another umbrella structure at a distal end of the wire structure.
12. The apparatus of claim 11 , wherein the wire structure comprises a braided wire or a laser-cut hypotube, and wherein the umbrella struts comprise a braided wire or a laser-cut hypotube.
13. The apparatus of claim 11 , wherein the thin-film sheet is a thin-film Nitinol (TFN) sheet having a thickness of between 1 and 50 micrometers.
14. The apparatus of claim 11 , wherein the thin-film sheet is a thin-film mesh comprising pores.
15. The apparatus of claim 14 , wherein the thin-film mesh comprises slits having a length between 50 and 200 micrometers prior to expansion, wherein the slits open up to a corresponding diamond-shaped pore in response to expansion, and wherein the expanded thin-film mesh forms struts having a width between 1 to 25 micrometers around each pore.
16. The apparatus of claim 14 , wherein the pore density of the thin-film mesh is between 81 and 1075 pore per mm 2 , and wherein the percent metal coverage of the thin-film mesh is between 19 and 66%.
17. The apparatus of claim 11 , wherein the spheroid spring comprises a spherical spring or an oval spring.
18. The apparatus of claim 11 , wherein the wire structure is formed from a braided wire, and the thin-film covered umbrella structure and the another umbrella structure are formed from laser-cut hypotubes.
19. The apparatus of claim 11 , wherein the wire structure, the thin-film covered umbrella structure, and the another umbrella structure are formed from a single braided wire.
20. The apparatus of claim 11 , wherein the wire structure, the thin-film covered umbrella structure, and the another umbrella structure are formed from a single hypotube structure.