Medical device

• US 20070027532A1
• Filed: 06/08/2006
• Published: 02/01/2007
• Est. Priority Date: 12/22/2003
• Status: Abandoned Application

• Current Assignee: Biophan Technologies Incorporated
• Original Assignee: Biophan Technologies Incorporated
• Inventors: Wang, Xingwu, Greenwald, Howard
• Application Number:
  US11/449,257
• Publication Number:
  US 20070027532A1
• Time in Patent Office: Days
• US Class Current: 623/1.440
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00

Abstract

An implantable medical device comprised of a lumen. When the device is, at different points in time, exposed to two different radio frequency electromagnetic radiations, one of whose frequencies differs from the other by a factor of at least 1.5, at least 90 percent of each of the radio frequency electromagnetic radiations penetrates to the lumen of the device.

Claims

1. A coated substrate assembly having a magnetic susceptibility comprising

a stent adapted for maintaining an open lumen in a duct in a living organism, said stent comprising a tubular skeletal structure comprised of an electrically conducting material and having a plurality of apertures defining a plurality of closed loop conducting paths in said electrically conducting material;

a plurality of coated layers disposed on at least a portion of at least one of said closed loop conducting paths, said plurality of coated layers arranged so that said coated substrate assembly has low magnetic susceptibility to radio frequency electromagnetic radiation;

said coated substrate assembly has a saturization magnetization of at least 20,000 Gauss,

said plurality of coated layers is comprised of particulates having an average particle size of less than about 100 nanometers; and

said plurality of coated layers comprising a first layer comprising a magnetic material having a thickness of from about 100 angstroms to about 10,000 angstroms disposed

continuously on at least 90 percent of the surface of said tubular skeletal structure.

2. The coated substrate assembly recited in claim 1, wherein

said magnetic material has a thickness of from about 100 angstroms to about 5,000 angstroms,

said magnetic material has a dielectric constant of from about 1.1 to about 50,

said magnetic material has a resistivity of from about 0.000008 to about 0.01 Ohm-meters,

said magnetic material has a magnetization at 300 Kelvin of from about 0.01 to about 2000 electromagnetic units per cubic centimeter,

said magnetic material has a relative AC permeability of from about 1.1 to about 150, and

said magnetic material has a relative DC permeability at 1.5 Tesla of 1.0 to about 1.5.

3. The coated substrate assembly as recited in claim 2, wherein said magnetic material is comprised of a material with an empirical formula FeAlN.

4. The coated substrate assembly as recited in claim 3, wherein said magnetic material comprises a material with an empirical formula FeAlN comprising from about 3 mole per cent to about 95 mole percent of iron by total moles of iron and aluminum.

5. The coated substrate assembly as recited in claim 3, wherein said magnetic material comprises a material with an empirical formula FeAlN comprising from about 60 mole per cent to about 95 mole percent of iron by total moles of iron and aluminum.

6. The coated substrate assembly recited in claim 1, wherein said plurality of coated layers further comprises a second layer comprising a first dielectric material disposed over at least a portion of said first layer and communicating with said first layer, wherein said second layer has a thickness of from about 100 angstroms to about 5000 angstroms, and a dielectric constant of at least about 80.

7. The coated substrate assembly recited in claim 6, wherein said first dielectric material comprises a material with the empirical formula selected from the group consisting of AlN, Ba_xSr_1-xTiO₃ and BaTiO_3.

8. The coated substrate assembly recited in claim 6, wherein said plurality of coated layers further comprises a third layer comprising a first conductive material disposed over at least a portion of said second layer and communicating with said second layer, wherein said third layer has a thickness of from about 100 angstroms to about 5000.

9. The coated substrate assembly recited in claim 8, wherein said first conductive material comprises aluminum.

10. The coated substrate assembly recited in claim 8, wherein said plurality of coated layers further comprises a fourth layer comprising a second dielectric material disposed over at least a portion of said third layer and communicating with said third layer, wherein said fourth layer has a thickness of from about 100 angstroms to about 5000 angstroms, and a dielectric constant of at least about 80.

11. The coated substrate assembly recited in claim 10, wherein said second dielectric material comprises a material with the empirical formula selected from the group consisting of FeAlN, AlN, Ba_xSr_1-xTiO₃ and BaTiO₃

12. The coated substrate assembly recited in claim 10, wherein said plurality of coated layers further comprises a fifth layer comprising a second conductive material disposed over at least a portion of said fourth layer and communicating with said fourth layer, wherein said fifth layer has a thickness of from about 100 angstroms to about 5000.

13. The coated substrate assembly recited in claim 12, wherein said second conductive material comprises aluminum.

14. The coated substrate assembly recited in claim 1, wherein said plurality of coated layers further comprises a second layer comprising a first conductive material disposed over at least a portion of said first layer and communicating with said first layer, wherein said second layer has a thickness of from about 100 angstroms to about 5000.

15. The coated substrate assembly recited in claim 14, wherein said first conductive material comprises aluminum.

16. The coated substrate assembly recited in claim 14, wherein said plurality of coated layers further comprises a third layer comprising a first dielectric material disposed over at least a portion of said second layer and communicating with said second layer, wherein said third layer has a thickness of from about 100 angstroms to about 5000 angstroms, and a dielectric constant of at least about 80.

17. The coated substrate assembly recited in claim 16, wherein said first dielectric material comprises a material with the empirical formula selected from the group consisting of AlN, Ba_xSr_1-xTiO₃ and BaTiO₃

18. The coated substrate assembly recited in claim 16, wherein said plurality of coated layers further comprises a fourth layer comprising a second conductive material disposed over at least a portion of said third layer and communicating with said third layer, wherein said fourth layer has a thickness of from about 100 angstroms to about 5000 angstroms.

19. The coated substrate assembly recited in claim 18, wherein said second conductive material comprises aluminum.

20. The coated substrate assembly recited in claim 1, wherein said plurality of coated layers further comprises a second layer comprising a first segment and a second segment together having an angular circumference of 360 degrees.

21. The coated substrate assembly recited in claim 20, wherein said first segment comprises a first conductive material disposed over at least a portion of said magnetic material and having a thickness of from about 100 angstroms to about 5,000 angstroms.

22. The coated substrate assembly recited in claim 21, wherein said first conductive material comprises aluminum.

23. The coated substrate assembly recited in claim 22, wherein said first conductive material has a thickness of from about 100 angstroms to about 5,000 angstroms.

24. The coated substrate assembly recited in claim 20, wherein said first segment has an angular measurement of from about one degree to about 359 degrees.

25. The coated substrate assembly recited in claim 24, wherein said first segment has an angular measurement of about 337.5 degrees.

26. The coated substrate assembly recited in claim 24, wherein said plurality of coated layers further comprises a third layer comprising a first dielectric material disposed over at least a portion of said second layer and communicating with said second layer, wherein said third layer has a thickness of from about 100 angstroms to about 5000 angstroms, and a dielectric constant of at least about 80.

27. The coated substrate assembly recited in claim 26, wherein said first dielectric material comprises a material with the empirical formula selected from the group consisting of AlN, Ba_xSr_1-xTiO₃ and BaTiO₃

28. The coated substrate assembly recited in claim 27, wherein said plurality of coated layers further comprises a fourth layer comprising a third segment and a fourth segment together having an angular circumference of 360 degrees.

29. The coated substrate assembly recited in claim 27, wherein said third segment comprises a second conductive material disposed over at least a portion of said third layer and having a thickness of from about 100 angstroms to about 10,000 angstroms.

30. The coated substrate assembly recited in claim 29, wherein said second conductive material comprises aluminum.

31. The coated substrate assembly recited in claim 29, wherein said third segment has an angular measurement of from about one degree to about 359 degrees.

32. The coated substrate assembly recited in claim 31, wherein said third segment has an angular measurement of about 337.5 degrees.

33. The coated substrate assembly recited in claim 31, wherein said plurality of coated layers further comprises a fifth layer comprising a thirteenth segment, a fourteenth segment, a fifthteenth segment, a sixteenth segment, a seventeenth segment, an eighteenth segment, a ninteenth segment and a twentieth segment together having an angular circumference of 360 degrees, wherein

the thirteenth segment, fifteenth segment, seventeenth segment and nineteenth segments comprise a second conductive material disposed over at least a portion of said fourth layer and communicating with said fourth layer, wherein said thirteenth segment, fifteenth segment, seventeenth segment and nineteenth segments have a thickness of from about 100 angstroms to about 5000 angstroms.

34. The coated substrate assembly recited in claim 33, wherein said second conductive material comprises aluminum.

35. The coated substrate assembly recited in claim 33, wherein said thirteenth segment, fifteenth segment, seventeenth segment and nineteenth segments have an angular measurement of from about one degree to about 352 degrees.

36. The coated substrate assembly recited in claim 33, wherein said thirteenth segment, fifteenth segment, seventeenth segment and nineteenth segments have an angular measurement of about 67.5 degrees, wherein said thirteenth segment, fifteenth segment, seventeenth segment and nineteenth segments are equally spaced about the 360 degree circumference.

37. The coated substrate assembly recited in claim 33, wherein said plurality of coated layers further comprises a fourth layer comprising a second dielectric material disposed over at least a portion of said third layer and communicating with said third layer, wherein said fourth layer has a thickness of from about 100 angstroms to about 5000 angstroms, and a dielectric constant of at least about 80.

38. The coated substrate assembly recited in claim 37, wherein said second dielectric material comprises a material with the empirical formula selected from the group consisting of FeAlN, AlN, Ba_xSr_1-xTiO₃ and BaTiO₃

39. The coated substrate assembly recited in claim 37, wherein said plurality of coated layers further comprises a fifth layer comprising a second conductive material disposed over at least a portion of said fourth layer and communicating with said fourth layer, wherein said fifth layer has a thickness of from about 100 angstroms to about 5000 angstroms.

40. The coated substrate assembly recited in claim 39, wherein said second conductive material comprises aluminum.

41. The coated substrate assembly recited in claim 39, wherein said plurality of coated layers further comprises a third layer comprising a fifth segment, a sixth segment, a seventh segment, an eighth segment, a ninth segment, a tenth segment, an eleventh segment and a twelvth segment together having an angular circumference of 360 degrees, wherein

the fifth segment, seventh segment, ninth segment and eleventh segments comprise a first conductive material disposed over at least a portion of said second layer and communicating with said second layer, wherein said fifth segment, seventh segment, ninth segment and eleventh segments have a thickness of from about 100 angstroms to about 5000 angstroms.

42. The coated substrate assembly recited in claim 41, wherein said first conductive material comprises aluminum.

43. The coated substrate assembly recited in claim 41, wherein said fifth segment, seventh segment, ninth segment and eleventh segments have an angular measurement of from about one degree to about 352 degrees.

44. The coated substrate assembly recited in claim 41, wherein said fifth segment, seventh segment, ninth segment and eleventh segments have an angular measurement of about 67.5 degrees, wherein said fifth segment, seventh segment, ninth segment and eleventh segments are equally spaced about the 360 degree circumference.

45. A coated substrate assembly comprising a substrate coated with a coating comprising at least four layers, said layers comprising particulates wherein

(a) said substrate has a top surface, a bottom surface, a first end and a second end;

(b) said particulates have an average particle size of less than about 100 nanometers;

(c) said layers comprise at least a first layer, a second layer, a third layer and a fourth layer;

(d) said first layer is comprised of a magnetic material;

(e) said first layer has a thickness less than about 10,000 Angstroms, (f) said first layer is disposed continuously on at least 90%, and optionally on substantially all surfaces of said top surface and said bottom surface and joined at said first end and said second end; and

(g) said coated substrate assembly has a saturization magnetization of at least 20,000 Gauss.

46. The coated substrate assembly as recited in claim 45, wherein said substrate is a stent.

47. The coated substrate assembly as recited in claim 46, wherein said stent is a metallic stent, optionally a copper stent.

48. The coated substrate assembly as recited in claim 45, wherein said magnetic material comprises a material with an empirical formula FeAlN.

49. The coated substrate assembly as recited in claim 48, wherein said magnetic material comprises a material with an empirical formula FeAlN having more than about 60 mole per cent of iron by total moles of iron and aluminum.

50. The coated substrate assembly as recited in claim 48, wherein said magnetic material comprises a material with an empirical formula FeAlN having from about 50 weight per cent to about 95 weight percent of iron by total weight of iron and aluminum.

51. The coated substrate assembly as recited in claim 48, wherein said second layer comprises a first conductive material, optionally aluminum.

52. The coated substrate assembly as recited in claim 51, wherein said second layer is disposed on at least a portion of said first layer symmetrically on said top surface and said bottom surface.

53. The coated substrate assembly as recited in claim 45, wherein each of said second layer, said third layer, and said fourth layer, independently, have a thickness of from about 200 Angstroms to about 15,000 Angstroms, optionally from about 200 Angstroms to about 5000 Angstroms.

54. The coated substrate assembly as recited in claim 52, wherein said second layer comprises a first segment and a second segment, optionally wherein said first segment comprises an arc of about 22.5 degrees and said second segment comprises an arc of about 337.5 degrees.

55. The coated substrate assembly as recited in claim 54, wherein said first segment comprises a material with the empirical formula AlN and said second segment comprises aluminum.

56. The coated substrate assembly as recited in claim 54, wherein said second segment comprises aluminum vias.

57. The coated substrate assembly as recited in claim 51, wherein said third layer comprises a dielectric material, optionally wherein said third layer comprises a material with the empirical formula AlN, further optionally wherein said third layer is disposed on at least a portion of said second layer symmetrically on said top surface and said bottom surface.

58. The coated substrate assembly as recited in claim 57, wherein said first segment communicates with said third layer.

59. The coated substrate assembly as recited in claim 58, wherein said fourth layer is disposed on at least a portion of said third layer symmetrically on said top surface and said bottom surface.

60. The coated substrate assembly as recited in claim 59, wherein said fourth layer comprises a third segment and a fourth segment and wherein said third segment comprises an arc of about 45 degrees and said fourth segment comprises an arc of about 315 degrees, optionally wherein said fourth segment comprises aluminum.

61. The coated substrate assembly as recited in claim 60, wherein

(a) a centerline of said third segment is aligned along a linear axis with a centerline of said first segment,

(b) said centerline of said third segment is disposed about 180 degrees from said centerline of said first segment in the peripheral direction,

optionally wherein said third segment segment has no coating.

62. The coated substrate assembly as recited in claim 51, wherein said third layer comprises a first segment, a second segment, a third segment, a fourth segment, a fifth segment, a sixth segment, a seventh segment and an eighth segment;

optionally wherein;

(a) said first segment, said third segment, said fifth segment and said seventh segment comprise an arc with an angular segment of about 22.5 degrees,

(b) said second segment, said fourth segment, said sixth segment and said eighth segment comprise an arc with an angular segment of about 67.5 degrees,

(c) said fifth segment is disposed contiguous to said sixth segment and said fourth segment,

(d) said seventh segment is disposed contiguous to said sixth segment and said eighth segment,

(e) said first segment is disposed contiguous to said second segment and said eighth segment, and

(f) said third segment is disposed contiguous to said second segment and said fourth segment.

63. The coated substrate assembly as recited in claim 62, wherein

(a) said first segment, said third segment, said fifth segment and said seventh segment comprise a material with an empirical formula AlN, and

(b) said second segment, said fourth segment, said sixth segment and said eighth segment comprise aluminum.

64. The coated substrate assembly as recited in claim 62, wherein

(a) said first segment, said third segment, said fifth segment and said seventh segment comprise a material with an empirical formula FeAlN, and

(b) said second segment, said fourth segment, said sixth segment and said eighth segment comprise aluminum.

65. The coated substrate assembly as recited in claim 63, wherein said fourth layer is disposed on at least a portion of said third layer symmetrically on said top surface and said bottom surface, optionally wherein said fourth layer comprises a material with the empirical formula FeAlN.

66. The coated substrate assembly as recited in claim 64, wherein said fourth layer is disposed on at least a portion of said third layer symmetrically on said top surface and said bottom surface, optionally wherein said fourth layer comprises a material with the empirical formula AlN.

67. The coated substrate assembly as recited in claim 63, wherein said layers further comprise a fifth layer, optionally wherein said fifth layer is disposed on at least a portion of said fourth layer symmetrically on said top surface and said bottom surface, further optionally wherein said fifth layer comprises aluminum.

68. The coated substrate assembly as recited in claim 64, wherein said layers further comprise a fifth layer, optionally wherein said fifth layer is disposed on at least a portion of said fourth layer symmetrically on said top surface and said bottom surface, further optionally wherein said fifth layer comprises aluminum.

69. The coated substrate assembly as recited in claim 68, wherein said fifth layer comprise a ninth segment, a tenth segment, an eleventh segment, a twelvth segment, a thirteenth segment, a fourteenth segment, a fifteenth segment and a sixteenth segment, optionally wherein

(a) said ninth segment, said eleventh segment, said thirteenth segment and said fiftenth segment comprise an arc with an angular segment of about 22.5 degrees, and

(b) said tenth segment, said twelvth segment, said fourteenth segment and said sixteenth segment comprise an arc with an angular segment of about 67.5 degrees, further optionally wherein

(c) said ninth segment, said eleventh segment, said thirteenth segment and said fiftenth segment comprise a layer with no coating, and

(d) said tenth segment, said twelvth segment, said fourteenth segment and said sixteenth segment comprise aluminum.

70. The coated substrate assembly as recited in claim 67, wherein said fifth layer comprise a ninth segment, a tenth segment, an eleventh segment, a twelvth segment, a thirteenth segment, a fourteenth segment, a fifteenth segment and a sixteenth segment, optionally wherein

(a) said ninth segment, said eleventh segment, said thirteenth segment and said fiftenth segment comprise an arc with an angular segment of about 22.5 degrees, and

(b) said tenth segment, said twelvth segment, said fourteenth segment and said sixteenth segment comprise an arc with an angular segment of about 67.5 degrees, further optionally wherein

(c) said ninth segment, said eleventh segment, said thirteenth segment and said fiftenth segment comprise a layer with no coating, and

(d) said tenth segment, said twelvth segment, said fourteenth segment and said sixteenth segment comprise aluminum.