Internal medical devices for delivery of therapeutic agent in conjunction with a source of electrical power

• US 7,850,645 B2
• Filed: 02/11/2005
• Issued: 12/14/2010
• Est. Priority Date: 02/11/2005
• Status: Expired due to Fees

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Schewe, Scott, Weber, Jan, Warner, Robert, Atanasoska, Liliana, Holman, Thomas J.
• Primary Examiner(s): Lucchesi; Nicholas D
• Assistant Examiner(s): MEDWAY, SCOTT J
• Application Number:
  US11/055,930
• Publication Number:
  US 20060184092A1
• Time in Patent Office: 2,132 Days
• Field of Search: 604/20, 604500-502, 604 9601-103, 60410301-104
• US Class Current: 604/96.01
• CPC Class Codes: A61N 1/05 for implantation or insertion into the body, e.g. heart electrode A61N1/06 takes precedence
• CPC Class Codes: A61N 1/306 Arrangements where at least part of the apparatus is introduced into the body
• CPC Class Codes: A61N 1/325 for iontophoresis, i.e. transfer of media in ionic state by an electromotoric force into the body electrodes for external use A61N1/0428
• CPC Class Codes: A61N 1/327 for enhancing the absorption properties of tissue, e.g. by electroporation

Abstract

The invention generally relates to internal (e.g., implantable, insertable, etc.) drug delivery devices which contain the following: (a) one or more sources of one or more therapeutic agents; (b) one or more first electrodes, (c) one or more second electrodes and (d) one or more power sources for applying voltages across the first and second electrodes. The power sources may be adapted, for example, to promote electrically assisted therapeutic agent delivery within a subject, including electroporation and/or iontophoresis. In one aspect of the invention, the first and second electrodes are adapted to have tissue of a subject positioned between them upon deployment of the medical device within the subject, such that an electric field may be generated, which is directed into the tissue. Furthermore, the therapeutic agent sources are adapted to introduce the therapeutic agents into the electric field. In another aspect, the therapeutic agent sources are polymeric regions that contain one or more types of ion-conductive polymers and one or more types of charged therapeutic agents. In yet another aspect, the therapeutic agent sources are polymeric regions that contain one or more types of electrically conductive polymers and one or more types of charged therapeutic agents.

Claims

1. An internal medical device comprising:

(a) electrodes that are adapted to be positioned in a lumen of the cardiovascular system that is created by surrounding tissue upon implantation or insertion of said medical device in a subject, said electrodes further being adapted to have said surrounding tissue positioned between them upon deployment of said medical device within said lumen, (b) a power source adapted to apply a voltage across said electrodes, thereby generating an electric field having a vector that is directed into said surrounding tissue, and (c) a therapeutic agent source adapted to introduce a therapeutic agent into said electric field, wherein said device comprises an expandable tubular medical device substrate, wherein said therapeutic agent source comprises a charged therapeutic agent dispersed within an ion-conductive polymeric coating region disposed over said substrate, and wherein said electrodes comprise a first electrode provided beneath and in electrical contact with the polymeric coating region and a tissue penetrating electrode which penetrates said surrounding tissue upon deployment of said device by expansion of said substrate.

2. The internal medical device of claim 1, wherein said medical device is selected from catheters, grafts, stents, balloons, chronic total occlusion devices, aneurysm treatment devices, angioplasty devices, and filters.

3. The internal medical device of claim 1, wherein said medical device is selected from medical devices that provide new or enhanced paths for flow of bodily fluids subsequent to implantation or insertion and medical devices that obstruct flow of bodily fluids subsequent to implantation or insertion.

4. The internal medical device of claim 1, wherein said power source is adapted to apply a voltage that is sufficient to cause electroporation within said surrounding tissue.

5. The internal medical device of claim 1, wherein said device comprises a plurality of said tissue penetrating electrodes.

6. The internal medical device of claim 5, wherein said plurality of tissue penetrating electrodes are selected from blades, needles and a combination thereof.

7. The internal medical device of claim 6, wherein said needles are selected from metal microneedles, metal alloy microneedles, conductive nanotubes, conductive nanowires, and combinations of the same.

8. The internal medical device of claim 6, wherein said plurality of tissue penetrating electrodes are disposed at an outer surface of said expandable device such that said electrodes pierce said surrounding tissue upon deployment.

9. The internal medical device of claim 1, wherein said power source is adapted to apply a voltage that is sufficient to cause enhanced retention of said charged therapeutic agent, enhanced delivery of said charged therapeutic agent, or both.

10. The internal medical device of claim 9, wherein said power source is further adapted to apply a voltage that is sufficient to cause electroporation within said surrounding tissue.

11. The internal medical device of claim 1, wherein said medical device comprises a plurality of said polymeric coating regions.

12. The internal medical device of claim 11, wherein said medical device comprises a first polymeric coating region that comprises a first charged therapeutic agent having a positive charge and a second polymeric coating region that comprises a second charged therapeutic agent having a negative charge.

13. The internal medical device of claim 1, wherein said polymeric coating region comprises a polymer selected from a polyether, a polyelectrolyte, an electrically conductive polymer, and a combination thereof.

14. The internal medical device of claim 1, wherein said polymeric coating region comprises a polymer selected from a homopolymer, a random copolymer, a periodic copolymer, a block copolymer and a combination thereof.

15. The internal medical device of claim 1, wherein said charged therapeutic agent is selected from a therapeutic agent that is inherently charged, a therapeutic agent that is covalently attached to a charged molecule, a therapeutic agent that is non-covalently attached to a charged molecule, a therapeutic agent that is attached to or encapsulated within a charged particle, and a combination thereof.

16. The internal medical device of claim 1, wherein said charged therapeutic agent comprises charged paclitaxel.

17. The internal medical device of claim 1, wherein said charged therapeutic agent comprises a polyelectrolyte chain.

18. The internal medical device of claim 1, wherein said polymeric coating region is disposed over a polymeric substrate.

19. The internal medical device of claim 18, wherein said polymeric substrate comprises a first polymer comprising a polyether chain, wherein said polymeric coating region comprises a second polymer comprising a polyether chain, and wherein said first and second polymers may be the same or different.

20. The internal medical device of claim 18, wherein said polymeric substrate comprises a first polymer comprising a polyamide chain, wherein said polymeric coating region comprises a second polymer comprising a polyamide chain, and wherein said first and second polymers may be the same or different.

21. The internal medical device of claim 18, wherein said polymeric substrate comprises a block copolymer that comprises polyether and polyamide chains, and wherein said polymeric coating region comprises an ion-conductive polymer that comprises a chain selected from a polyether chain, a polyamide chain, and a combination thereof.

22. The internal medical device of claim 21, wherein said block copolymer comprises polytetramethylene oxide and nylon 12 chains.

23. The internal medical device of claim 22, wherein said ion-conductive polymer comprises a chain selected from a poly(ethylene oxide) chain, a poly(amino acid) polyelectrolyte chain, and a combination thereof.

24. The internal medical device of claim 1, wherein said polymeric region is an ion-conductive polymeric region that comprises an inorganic phase.

25. The internal medical device of claim 1, wherein said polymeric region is an ion-conductive polymeric region that comprises an ionic liquid.

26. The internal medical device of claim 1, wherein said polymeric coating region comprises an electrically conductive polymer and wherein said power source is adapted to apply a voltage that is sufficient to cause electroporation in tissue adjacent to said device.

27. The internal medical device of claim 26, wherein said polymeric coating region comprises a conductive polymer selected from polypyrrole and its derivatives, polyaniline and its derivatives, polythiophene and its derivatives, poly(p-phenylene vinylene) and its derivatives, polysulfone and its derivatives, polyacetylene and its derivatives, and combinations thereof.

28. The internal medical device of claim 26, wherein said polymeric coating region comprises substituted polypyrrole, unsubstituted polypyrrole, or a combination thereof.

29. The internal medical device of claim 26, wherein said device is selected from catheters, grafts, stents, balloons, chronic total occlusion devices, aneurysm treatment devices, filters, and angioplasty devices.

30. The internal medical device of claim 26, wherein said medical device is selected from medical devices that provide new or enhanced paths for flow of bodily fluids subsequent to implantation or insertion and medical devices that obstruct flow of bodily fluids subsequent to implantation or insertion.

31. The internal medical device of claim 26, wherein said polymeric coating region is disposed over a polymeric substrate.

32. The internal medical device of claim 31, wherein said polymeric substrate comprises a block copolymer that comprises polyether and polyamide chains, and wherein said polymeric region comprises substituted polypyrrole, unsubstituted polypyrrole, or a combination thereof.

33. The internal medical device of claim 31, wherein said polymeric substrate is a balloon.

34. The internal medical device of claim 1, wherein sides of said tissue penetrating electrode are provided with a layer of insulating material.

35. The internal medical device of claim 1, wherein the tissue penetrating electrode is in the form of a needle.

36. The internal medical device of claim 1, wherein the tissue penetrating electrode is in the form of a blade.

37. The internal medical device of claim 1, wherein the expandable tubular medical device substrate is a balloon.

38. the medical device of claim 26, wherein said conductive polymer has a conjugated backbone.

39. The medical device of claim 1, wherein said body lumen is an artery lumen.

40. The internal medical device of claim 6, wherein said needles are conductive carbon nanotubes.

41. The internal medical device of claim 26, wherein said conductive polymer is an overoxidized conductive polymer.

42. The internal medical device of claim 41, wherein said overoxidized conductive polymer is overoxidized polypyrrole.