Method of coating a medical device utilizing an ion-based thin film deposition technique, a system for coating a medical device, and a medical device produced by the method

• US 20060233941A1
• Filed: 04/15/2005
• Published: 10/19/2006
• Est. Priority Date: 04/15/2005
• Status: Abandoned Application

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Olson, Greg
• Application Number:
  US11/106,582
• Publication Number:
  US 20060233941A1
• Time in Patent Office: Days
• US Class Current: 427/2.100
• CPC Class Codes: A61L 2300/606 Coatings
• CPC Class Codes: A61L 31/10 Macromolecular materials
• CPC Class Codes: A61L 31/16 Biologically active materials, e.g. therapeutic substances A61L31/047 takes precedence
• CPC Class Codes: C23C 14/221 Ion beam deposition C23C14/46, C23C14/48 take precedence

Abstract

A method of coating a medical device is provided that includes forming a beam of ions of a coating material and focusing said beam using at least one electrostatic lens. The method also includes arranging the medical device within said beam. In the method, the forming of said beam of the coating material may include aerosolizing a solution of the coating material and evaporating a solvent of the solution. The method may include providing an opposite electrostatic charge to the medical device. The method may include fixturing the medical device to allow the coating material to contact about all of a surface of the medical device. The method may include rotating the medical device about an axis perpendicular to said beam. The method may include moving the medical device through the region of the focus of the at least one electrostatic lens and contacting said beam with a portion of an exposed surface of the medical device. A system for coating a medical device is provided. A medical device having a coating applied by a method is provided.

Claims

1. A method of coating a medical device, comprising:

forming a beam of ions of a coating material;

focusing said beam using at least one electrostatic lens; and

arranging the medical device within said beam.

2. The method of claim 1, wherein the medical device is arranged within a focused region of said beam.

3. The method of claim 1, wherein the forming of said beam of the coating material comprises:

aerosolizing a solution of the coating material; and

evaporating a solvent of the solution.

4. The method of claim 3, wherein the aerosolizing of the solution further comprises injecting the solution with a capillary having an electrostatic potential, the solution forming the aerosol upon leaving the capillary, the aerosol including microdroplets having an electrostatic charge.

5. The method of claim 3, wherein the evaporating of the solvent further comprises passing heated, dry air through the aerosolized solution.

6. The method of claim 1, further comprising providing an electrostatic charge to the medical device, the electrostatic charge being oppositely charged of the ions.

7. The method of claim 1, wherein:

the medical device comprises at least one of stainless steel, a polymer substrate, a biodegradable material, and nitinol; and

the coating material comprises at least one of a bioactive agent, an adhesive, and a polymer.

8. The method of claim 1, further comprising fixturing the medical device to allow the coating material to contact about all of a surface of the medical device.

9. The method of claim 8, further comprising rotating the medical device about an axis perpendicular to said beam.

10. The method of claim 1, further comprising:

moving the medical device through the region of the focus of the at least one electrostatic lens; and

contacting said beam with a portion of an exposed surface of the medical device.

11. The method of claim 10, wherein:

the medical device is at least one of a stent, a wire, and a balloon; and

the portion of the exposed surface contacted with said beam includes an external pattern of the medical device.

12. The method of claim 10, wherein said beam contacting the portion of the exposed surface of the medical device forms a layer of the ions of the coating material.

13. The method of claim 12, wherein the layer forms at least one of a reinforcement band, a geometric pattern, a cone, and an expansion profile.

14. The method of claim 12, further comprising:

forming another beam of other ions of another coating material;

focusing said other beam using the at least one electrostatic lens; and

arranging the medical device in the region of the focus of the at least one electrostatic lens; and

contacting said other beam with the portion of the exposed surface of the medical device;

wherein said other beam contacting the portion of the exposed surface of the medical device forms another layer of the other ions of the other coating material.

15. The method of claim 12, further comprising selecting a desired thickness of the layer of the ions, the selected desired thickness determining at least one of an intensity of said beam and a rate of movement of the medical device through the region of the focus.

16. The method of claim 10, wherein said beam contacting the portion of the exposed surface of the medical device forms a structure of the ions of the coating material, the structure extending away from the exposed surface of the medical device.

17. The method of claim 16, wherein the structure of the ions of the coating material forms at least one of a reinforced band, a pocket, a grid, and electrical insulation.

18. The method of claim 1, wherein the at least one electrostatic lens is annular, said beam passing through a center of the at least one annular electrostatic lens.

19. The method of claim 1, wherein the focusing operation further includes at least one of varying a frequency and varying an amplitude of an electrostatic force using the at least one electrostatic lens.

20. The method of claim 1, wherein the focusing of said beam using the at least one electrostatic lens further includes at least one of:

selecting a size of the ions for the beam; and

selecting a velocity of the ions in the beam.

21. A system for coating a medical device, comprising:

a source of a coating material;

an arrangement for aerosolizing the coating material;

an air dryer for evaporating a solvent from the aerosolized coating material;

at least one electrostatic lens adapted to focus a beam of ions; and

a fixturing arrangement for holding the medical device in a region of a focus of the at least one electrostatic lens.

22. A medical device having a coating applied by a method, the method comprising:

aerosolizing a solution of the coating material;

evaporating a solvent of the solution;

forming a beam of ions of a coating material;

focusing said beam using at least one electrostatic lens; and

arranging the medical device in a region of a focus of the at least one electrostatic lens.