Rotational thrombectomy wire
View Patent ↗A rotatable thrombectomy wire for breaking up thrombus or other obstructive material comprising an inner core composed of a flexible material and an outer wire surrounding at least a portion of the inner core. The outer wire has a sinuous shaped portion at a distal region. The inner core limits the compressibility of the outer wire. The outer wire is operatively connectable at a proximal end to a motor for rotating the wire to macerate thrombus.
1. A method for breaking up thrombus or other obstructive material in a native vessel comprising:
providing a thrombectomy wire having an inner core composed of a flexible material, an at least one outer wire wound over at least a portion of the inner core forming a coil with an exterior surface extending proximally of a distalmost end of the coil, wherein the coil has a sinuous shaped portion at a distal region and the inner core has a sinuous shaped portion within the sinuous shaped portion of the coil, a polymeric material positioned over the exterior surface of at least a first portion of the coil to block interstices of the at least one outer wire, a separate distal tip component, a portion of the distal tip component positioned over the exterior surface of a second portion of the coil, and a flexible elongated polymeric tip positioned over the distal tip component and extending distally therefrom, the distal tip component extending distally of the distalmost end of the coil and extending proximally of a proximalmost end of the flexible elongated polymeric tip;
delivering the thrombectomy wire to the lumen of the native vessel such that the sinuous shaped portions of the inner core and coil are in a more linear configuration within a sheath;
exposing the sinuous shaped portion of the coil so the sinuous shaped portion is in a sinuous configuration; and
actuating a motor operatively connected to the thrombectomy wire so the thrombectomy wire rotates about its longitudinal axis so the sinuous shaped portion of the coil contacts the inner wall of the native vessel to macerate thrombus in the vessel as the thrombectomy wire rotates.
2. The method of claim 1 , further comprising the step of retracting the thrombectomy wire during rotation.
3. The method of claim 1 , further comprising the step of injecting an imaging dye into the vessel.
4. The method of claim 3 , further comprising the steps of delivering the thrombectomy wire through the sheath and the step of injecting the imaging dye injects the dye through a lumen in the sheath in a space between the thrombectomy wire and an inner wall of the sheath.
5. The method of claim 1 , wherein the inner core limits the compressibility of the thrombectomy wire.
6. The method of claim 5 , wherein the inner core has an outer diameter to fill an inside of the coil so the coil only compresses to the outer diameter.
7. The method of claim 1 , wherein the step of actuating the motor causes the thrombectomy wire to contact the inner wall of the native vessel for treatment of deep vein thrombosis.
8. The method of claim 1 , wherein the step of actuating the motor causes the thrombectomy wire to contact the inner wall of the native vessel for treatment of pulmonary embolism.
9. The method of claim 1 , wherein the polymeric material is applied as a coating.
10. The method of claim 1 , wherein the polymeric material is applied as a shrink wrap material.
11. The method of claim 1 , wherein the at least one outer wire comprises a bifilar wire formed by first and second wires wound together side by side so a diameter of the first wire fills a space between adjacent turns of the second wire.
12. The method of claim 1 , wherein the inner core includes multiple wires twisted together.
13. The method of claim 1 , wherein the inner core is attached to the distal tip component within a recess of the distal tip component.
14. The method of claim 13 , wherein the coil is attached to the distal tip component within the recess of the distal tip component.
15. The method of claim 14 , wherein the distal tip component has recessed portions along its length to receive the polymeric tip thereover.
16. The method of claim 13 , wherein the distal tip component is a metal tip and extends distally of a distal end of the inner core.
17. The method of claim 16 , wherein the distal tip component extends proximally of the distal end of the inner core.
18. The method of claim 17 , wherein the polymeric material extends proximally of the distal tip component.
19. The method of claim 1 , wherein the polymeric tip is axially spaced from the distalmost end of the outer wire.
20. The method of claim 1 , wherein the polymeric tip has a solid region extending along a longitudinal axis thereof.