Thrombectomy device with distal protection
A vascular device is provided that includes a frame attached to a distal end of a delivery wire. The frame includes a cylindrical body formed of a plurality of interconnecting members, the interconnecting members being configured to exert a first radial force against an inner wall of an anatomical lumen. The vascular device further includes a protector having a proximal end, a distal end, and a profile that tapers distally from a proximal cross-sectional dimension to a reduced distal cross-sectional dimension. The protector is coupled to a distal end of the frame via a plurality of connecting members, each of the members extending from a distal end of a corresponding interconnecting member and converging distally to form a taper. The connecting members are configured to exert a second radial force, less than the first radial force, against the inner wall of the lumen.
1. A vascular device, comprising:
a frame attached to a distal end of a delivery wire, the frame comprising a cylindrical body formed of a plurality of interconnecting members, the interconnecting members being configured to exert a first radial force against an inner wall of an anatomical lumen when the frame has a first diameter; and
a protector having a proximal end, a distal end, and a profile that tapers distally from a proximal cross-sectional dimension to a reduced distal cross-sectional dimension, the protector being coupled to a distal end of the frame via a plurality of connecting members, each of the connecting members extending from a distal end of a corresponding interconnecting member and converging distally to form a taper, each connecting member comprising a proximal segment and a distal segment, the proximal segment of each connecting member comprising one of (a) a cross section less than that of the distal segment of the corresponding connecting member or (b) a chain comprising a plurality of links and two individual rows coupled to each other, the proximal segments permitting the protector to radially expand independent of a radial expansion of the frame, the distal segments of the connecting members being configured to exert a second radial force, less than the first radial force, against the inner wall of the lumen when the protector has the first diameter.
2. The vascular device of claim 1 , wherein a proximal portion of the plurality of connecting members form a greater cross-sectional dimension than does the cylindrical body.
3. The vascular device of claim 1 , wherein a proximal end of the connecting members tapers proximally radially inward without converging to a central longitudinal axis of the frame.
4. The vascular device of claim 1 , wherein each of the connecting members comprise a curve having a positive slope, negative slope, and an apex.
5. The vascular device of claim 4 , wherein the positive and negative slopes are configured to facilitate deflection of the protector as the protector is advanced in the anatomical lumen.
6. The vascular device of claim 4 , wherein, in an absence of external forces, the interconnecting members of the frame radially expand to a second diameter, and the connecting members radially expand to a third diameter, greater than the second diameter, wherein the third diameter is formed of apexes of each of the connecting members.
7. The vascular device of claim 1 , wherein at least one proximal segment comprises (b), and the links are non-ridgidly joined to each other so that the chain is highly laterally flexible but strong in longitudinal tension.
8. The vascular device of claim 1 , wherein at least one proximal segment comprises (b), and the chain is micromachined.
9. The vascular device of claim 1 , wherein the protector further comprises a mesh.
10. The vascular device of claim 9 , wherein the mesh comprises a plurality of pores sized such that the mesh is configured to capture emboli without preventing blood flow past the mesh.
11. The vascular device of claim 10 , wherein the plurality of pores each have a pore size of about 70-200 μm.
12. The vascular device of claim 9 , wherein the protector further comprises a collapsible hoop coupled to the mesh and the plurality of connecting members and disposed substantially perpendicular to a central longitudinal axis of the frame.
13. The vascular device of claim 12 , wherein the hoop is coupled to the connecting members at a radial apex of the connecting members.
14. The vascular device of claim 9 , wherein each of the connecting members comprise a curvature providing a sloped surface proximal of the mesh, the sloped surface being configured to assist the protector in conforming to the inner wall of the anatomical lumen as the vascular device is advanced in the lumen.
15. A vascular device, comprising:
a frame attached to a distal end of a delivery wire, the frame comprising a cylindrical body formed of a plurality of interconnecting members, the interconnecting members being configured to exert a first radial force against an inner wall of an anatomical lumen when the frame has a first diameter; and
a protector having a proximal end, a distal end, and a profile that tapers distally from a proximal cross-sectional dimension to a reduced distal cross-sectional dimension, the protector being coupled to a distal end of the frame via a plurality of connecting members, each of the connecting members extending distally from the frame, each connecting member comprising a proximal segment and a distal segment, the proximal segment of each connecting member comprising a cross section less than that of the distal segment of the corresponding connecting member, the distal segments of the connecting members being configured to exert a second radial force, less than the first radial force, against the inner wall of the lumen when the protector has the first diameter.
16. The vascular device of claim 15 , wherein a proximal portion of the plurality of connecting members form a greater cross-sectional dimension than does the cylindrical body.
17. The vascular device of claim 15 , wherein a proximal end of the connecting members tapers proximally radially inward without converging to a central longitudinal axis of the frame.
18. The vascular device of claim 15 , wherein each of the connecting members comprise a curve having a positive slope, negative slope, and an apex.
19. The vascular device of claim 18 , wherein, in an absence of external forces, the interconnecting members of the frame radially expand to a second diameter, and the connecting members radially expand to a third diameter, greater than the second diameter, wherein the third diameter is formed of apexes of each of the connecting members.
20. The vascular device of claim 15 , wherein the protector further comprises a mesh.
21. The vascular device of claim 20 , wherein the mesh comprises a plurality of pores sized such that the mesh is configured to capture emboli without preventing blood flow past the mesh.
22. The vascular device of claim 21 , wherein the plurality of pores each have a pore size of about 70-200 nm.
23. The vascular device of claim 20 , wherein the protector further comprises a collapsible hoop coupled to the mesh and the plurality of connecting members and disposed substantially perpendicular to a central longitudinal axis of the frame.
24. The vascular device of claim 23 , wherein the hoop is coupled to the connecting members at a radial apex of the connecting members.