Complex wire formed devices
The devices and methods described herein relate to jointless construction of complex structures. Such devices have applicability in through-out the body, including clearing of blockages within body lumens, such as the vasculature, by addressing the frictional resistance on the obstruction prior to attempting to translate and/or mobilize the obstruction within the body lumen.
1. A method of improving blood flow in a blood vessel having an obstruction, the method comprising:
advancing a catheter into the blood vessel, the catheter containing an obstruction removal device having an expandable structure, the expandable structure extending between a near end and a far end and comprising a continuous wire construction with a plurality of wires, wherein the expandable structure includes an intermediate portion between first and second regions of the structure in which the wires converge inwardly, and wherein at least one of the wires along the intermediate portion extends longitudinally and substantially parallel to another one of the wires;
deploying the far end and the near end of the expandable structure respectively beyond a distal end and a proximal end of the obstruction such that the expandable structure spans across the obstruction and the intermediate portion expands within the vessel to embed into the obstruction;
holding the obstruction via the intermediate portion of the expandable structure between the first and second regions of the structure in which the wires converge inwardly; and
withdrawing the obstruction removal device and obstruction from the vessel to improve blood flow in the blood vessel.
2. The method of claim 1 , where the intermediate portion forms a shaped section about the obstruction between the first and second regions.
3. The method of claim 1 , further comprising positioning the obstruction removal device across the obstruction such that the obstruction removal device is initially offset from a longitudinal axis of the obstruction.
4. The method of claim 1 , where deploying the far end of the obstruction removal device beyond the distal end of the obstruction comprises withdrawing the catheter relative to the obstruction removal device such that the far end of the obstruction removal device remains distal to the obstruction.
5. The method of claim 1 , expanding the intermediate portion to embed into the obstruction reduces a friction between the obstruction and a wall of the vessel.
6. The method of claim 1 , where the intermediate portion comprises at least one filament.
7. The method of claim 1 , where the expandable structure of the obstruction removal device is self-expanding.
8. The method of claim 1 , where allowing the intermediate portion to embed into the obstruction comprises allowing the intermediate portion to embed into the obstruction without substantially dislocating or mobilizing the obstruction within the blood vessel.
9. The method of claim 1 , where the obstruction removal device is fabricated from a process selected from the group consisting of a photochemical etching, mechanical drilling, weaving, braiding, and laser cutting.
10. The method of claim 1 , further comprising advancing a catheter adjacent to the obstruction and where advancing the obstruction removal device comprises advancing the obstruction removal device and catheter through the catheter to the obstruction.
11. The method of claim 10 , further comprising withdrawing at least a portion of the obstruction removal device within the catheter and removing the catheter from the vessel.
12. The method of claim 1 , where the obstruction comprises a blood clot, plaque, cholesterol, thrombus, a naturally occurring foreign body, a non-naturally occurring foreign body or a combination thereof.
13. The method of claim 1 , further comprising expanding the vessel adjacent to the obstruction to decrease a friction between the vessel and the obstruction.
14. The method of claim 1 , where the expandable structure comprises a shape memory alloy.
15. The method of claim 1 , where the expandable structure comprises a number of radiopaque wires which improve visibility under fluoroscopic imaging.
16. The method of claim 1 , where the first region is located distal of a proximal end of the expandable structure, and proximal of a distal end of the expandable structure.
17. The method of claim 16 , where the second region is located distal of a proximal end of the expandable structure, and proximal of a distal end of the expandable structure.
18. The method of claim 17 , where the second region is located distal of the first region.
19. A method of improving blood flow in a blood vessel having an obstruction, the method comprising:
advancing an obstruction removal device within the blood vessel where the obstruction removal device comprises an expandable structure extending between a near end and a far end, where the expandable structure and comprising a continuous wire construction with a plurality of wires, wherein the expandable structure includes an intermediate portion between first and second regions of the structure in which the wires converge inwardly, and wherein at least one of the wires along the intermediate portion extends longitudinally and substantially parallel to another one of the wires;
deploying the far end and the near end of the expandable structure such that the expandable structure spans across the obstruction and the intermediate portion expands within the vessel to embed into the obstruction;
holding the obstruction via the intermediate portion of the expandable structure between the first and second regions of the structure in which the wires converge inwardly; and
withdrawing the obstruction removal device and obstruction from the vessel to improve blood flow in the blood vessel.
20. The method of claim 19 , where the intermediate portion forms a shaped section about the obstruction between the first and second regions.
21. The method of claim 19 , where deploying the obstruction removal device comprises advancing a catheter through the obstruction.
22. The method of claim 19 , where the expandable structure of the obstruction removal device is self-expanding.
23. The method of claim 19 , where allowing the intermediate portion to embed into the obstruction comprises allowing the intermediate portion to embed into the obstruction without substantially dislocating or mobilizing the obstruction within the blood vessel.
24. The method of claim 19 , where the first region is located distal of a proximal end of the expandable structure, and proximal of a distal end of the expandable structure.
25. The method of claim 24 , where the second region is located distal of a proximal end of the expandable structure, and proximal of a distal end of the expandable structure.
26. The method of claim 25 , where the second region is located distal of the first region.