Sacrificial anode stent system

• US 20050192661A1
• Filed: 05/03/2005
• Published: 09/01/2005
• Est. Priority Date: 06/26/2002
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Gerberding, Brent C., Griffen, Stephen
• Granted Patent: US 8,016,853 B2
• Time in Patent Office: Days
• US Class Current: 623/1.15
• CPC Class Codes: A61B 17/12022 Occluding by internal devices, e.g. balloons or releasable wires plugging an opening in the wall of an organ A61B17/0057; occluders for the cervical canal A61F6/146; vas deferens occluders A61F6/20
• CPC Class Codes: A61B 17/12036 partial occlusion
• CPC Class Codes: A61B 17/12118 for positioning in conjunction with a stent
• CPC Class Codes: A61B 17/1214 Coils or wires
• CPC Class Codes: A61B 2017/12063 electrolytically detachable
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/823 Stents, different from stent-grafts, adapted to cover an aneurysm
• CPC Class Codes: A61F 2002/91541 Adjacent bands are arranged out of phase
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2220/0041 using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2250/0054 differing in corrosion resistance
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: Y10S 623/903 Blood vessel

Abstract

A sacrificial anode stent system comprises a stent having at least one sacrificial anode portion and a vaso-occlusive device. The vaso-occlusive device has at least one portion with a potential different from that of the sacrificial anode portion of the stent.

Claims

1-24. -24. (canceled)

25. A method for treating a brain aneurysm, comprising:

providing a sacrificial anode stent delivery system having a stent and a vaso-occlusive device, the stent being coated with at least one therapeutic agent, and having at least one sacrificial anode portion;

providing the vaso-occlusive device with at least one portion with a corrosion potential different from that of the sacrificial anode portion of the stent;

providing a power source that is in electrical communication with the sacrificial anode portion;

inserting the stent within a body lumen;

advancing the stent delivery system to the brain aneurysm;

deploying the stent within the body lumen;

placing the vaso-occlusive coil within the brain aneurysm;

applying a voltage potential from the power source through an electrical pathway to the sacrificial anode portion;

corroding the sacrificial anode portion.

26. The method of claim 25 wherein the sacrificial anode portion is positioned at at least one of a proximal end of the stent and a distal end of the stent.

27. The method of claim 25 wherein the sacrificial anode stent delivery system includes a plurality of sacrificial anode portions.

28. The method of claim 25 wherein the sacrificial anode stent delivery system includes a plurality of sacrificial anode portions wherein the sacrificial anode portions are positioned at at least one of a proximal end of the stent and a distal end of the stent.

29. The method of claim 25 wherein the sacrificial anode stent delivery system comprises a plurality of sacrificial anode portions, the sacrificial anode portions provided in the form of tabs extending from one or both ends of the stent.

30. The method of claim 25 wherein the stent comprises radiopaque portions.

31. The method of claim 30 wherein the sacrificial anode stent delivery system comprises a plurality of sacrificial anode portions, the sacrificial anode portions and the radiopaque portions provided in the form of tabs extending from one or both ends of the stent.

32. The method of claim 25 wherein the vaso-occlusive device is in the form of a coil.

33. The method of claim 25 wherein the vaso-occlusive device is in the form of a Guglielmi electrolytically detachable coil coil.

34. The method of claim 32 wherein the coil includes platinum and the non-sacrificial portion of the stent includes stainless steel.

35. The method of claim 34 wherein the sacrificial portion is selected from the group consisting of magnesium, zinc, aluminum, mild steel, low alloy steel, and iron or any combination thereof.

36. A method for treating a brain aneurysm, comprising:

providing a stent and a medical device, each having at least one metal portion, the stent being coated with at least one therapeutic agent;

providing the metal portion of the stent with a corrosion potential different from that of the medical device;

selecting from either the stent or medical device a sacrificial portion of a different corrosion potential from that of the remainder of the stent or medical device;

providing a power source that is in electrical communication with the sacrificial anode portion;

inserting the stent within a body lumen;

advancing the stent delivery system to the brain aneurysm;

deploying the stent within the body lumen;

placing the medical device within the brain aneurysm;

applying a voltage potential from the power source through an electrical pathway to the sacrificial anode portion;

corroding the sacrificial portion.

37. The method of claim 36 wherein the medical device is a coil and the sacrificial portion is part of the stent.

38. The method of claim 37 wherein the coil includes platinum and the non-sacrificial portion of the stent includes stainless steel.

39. The method of claim 38 wherein the sacrificial portion is selected from the group consisting of magnesium, zinc, aluminum, mild steel, low alloy steel, and iron or any combination thereof.