Non-invasive heating of implanted vascular treatment device
View Patent ↗One embodiment of the present invention involves employing, in a vascular treatment device, a material which has a magnetic susceptibility which is heat sensitive. The vascular treatment device can then be heated remotely and non-invasively using an applied magnetic field, to a preselected temperature at which the vascular treatment device becomes substantially non-magnetically susceptible.
1. A vascular treatment device, comprising:
a stent formed with a magnetically susceptible material having a magnetic susceptibility that decreases within a preselected temperature range, wherein the stent includes a core, where the core is formed of the susceptible material.
2. The vascular treatment device of claim 1 , wherein the susceptible material has a Curie temperature in the preselected temperature range.
3. The vascular treatment device of claim 1 , wherein the stent includes a core, where the susceptible material comprises a coating on a surface of the core.
4. The vascular treatment device of claim 3 , wherein the coating is disposed on an external surface of the core.
5. The vascular treatment device of claim 3 , wherein the coating is disposed on an internal surface of the core.
6. The vascular treatment device of claim 3 , wherein the coating is disposed on both an internal and external surface of the core.
7. The vascular treatment device of claim 3 , wherein preselected portions of the core material are formed of the susceptible material and preselected portions are formed of another material.
8. The vascular treatment device of claim 3 , wherein only preselected portions, less than the entire core, are coated with the susceptible material.
9. The vascular treatment device of claim 3 , wherein the core comprises a magnetically susceptible material.
10. The vascular treatment device of claim 1 , wherein the susceptible material comprises one of Ferrite Oxide (FEO) and Chromium Oxide (CrO).
11. The vascular treatment device of claim 10 wherein the susceptible material has a particle size less than approximately 500 nanometers.
12. The vascular treatment device of claim 1 , wherein the medical device comprises:
a therapeutic agent delivery device.
13. The vascular treatment device of claim 12 , wherein the delivery device includes an expandable member, self-expanding to an expanded position at a preselected temperature, and when in the expanded position the expandable member releases the therapeutic agent.
14. The vascular treatment device of claim 1 , wherein the medical device comprises:
a self-expanding stent, expanding at a temperature no greater than the preselected temperature range.
15. The vascular treatment device of claim 1 wherein the medical device comprises a balloon catheter.
16. The vascular treatment device of claim 1 wherein the medical device comprises a filter.
17. The vascular treatment device of claim 1 wherein the medical device comprises a guidewire.
18. The vascular treatment device of claim 1 , wherein the coating includes a polymer binder for the magnetically susceptible material.
19. The vascular treatment device of claim 1 , wherein the core is a metal selected from the group stainless steel, Nitinol, and tantalum.
20. The vascular treatment device of claim 1 , wherein the coating includes a sintered coating of the magnetically susceptible material on the core.
21. The vascular treatment device of claim 1 , wherein the coating includes a painted coating of the magnetically susceptible material on the core.
22. A vascular treatment system, comprising:
an electromagnetic field generator; and
a medical device deliverable to a treatment site and including a magnetically susceptible material being magnetically susceptible to an electromagnetic field generated by the generator and having a Curie temperature in a preselected temperature range, such that the implantable device heats to a temperature sufficient to treat the treatment site when the electromagnetic field is applied.
23. The vascular treatment system of claim 22 , wherein the medical device comprises;
a stent having a core material.
24. The vascular treatment system of claim 23 , wherein the susceptible material comprises a coating on a surface of the core material.
25. The vascular treatment system of claim 24 , wherein the coating is disposed on an external surface of the core material.
26. The vascular treatment system of claim 24 , wherein the coating is disposed on an internal surface of the core material.
27. The vascular treatment system of claim 24 , wherein the coating is disposed on both an internal and external surface of the core material.
28. The vascular treatment system of claim 24 , the preselected portions of the core material are formed of the susceptible material and preselected portions are formed of another material.
29. The vascular treatment system of claim 24 , wherein only preselected portions, less than the entire core, are coated with the susceptible material.
30. The vascular treatment system of claim 24 , wherein the core material comprises a magnetically susceptible material.
31. The vascular treatment system of claim 23 , wherein the core material is formed of the susceptible material.
32. The vascular treatment system of claim 22 , wherein the susceptible material comprises one of Ferrite Oxide (FEO) and Chromium Oxide (CrO) having a particle size of less than approximately 500 nm.
33. The vascular treatment system of claim 22 , wherein the medical device comprises:
a therapeutic agent delivery device.
34. The vascular treatment system of claim 33 , wherein the delivery device includes an expandable member, self-expanding to an expanded position at a preselected temperature, and when in the expanded position the expandable member releases the therapeutic agent.
35. The vascular treatment system of claim 22 , wherein the implantable member comprises:
a self-expending stent, expanding at a temperature no greater than the preselected temperature range.
36. The vascular treatment device of claim 22 , wherein the coating includes a polymer binder for the magnetically susceptible material.
37. The vascular treatment device of claim 22 , wherein the core is a metal selected from the group stainless steel, Nitinol, and tantalum.
38. The vascular treatment device of claim 22 , wherein the coating includes a sintered coating of the magnetically susceptible material on the core.
39. The vascular treatment device of claim 22 , wherein the coating includes a painted coating of the magnetically susceptible material on the core.