TiNxOy modified surface for an implantable device and a method of producing the same

• US 8,470,019 B1
• Filed: 11/30/2001
• Issued: 06/25/2013
• Est. Priority Date: 11/30/2001
• Status: Expired due to Fees

• Current Assignee: Abbott Cardiovascular Systems Incorporated (Abbott Laboratories Incorporated)
• Original Assignee: Advanced Cardiovascular Systems Incorporated
• Inventors: Malik, Shamim M., Mukherjee, Avijit
• Primary Examiner(s): SEVERSON, RYAN J
• Application Number:
  US09/997,450
• Time in Patent Office: 4,225 Days
• Field of Search: 623/1.15, 623/1.46, 623/1.43, 623/1.42, 623/143, 623/146, 427/2.24, 427/2.25, 427/2.3
• US Class Current: 623/1.15
• 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
• CPC Class Codes: A61L 31/022 Metals or alloys
• CPC Class Codes: A61L 31/088 Other specific inorganic materials not covered by A61L31/084 or A61L31/086
• CPC Class Codes: C23C 14/0036 Reactive sputtering
• CPC Class Codes: C23C 14/0664 Carbonitrides

Abstract

Implantable devices, such as stents, having a surface modified with TiN_xO_y or TiN_xC_y are disclosed.

Claims

1. A method of modifying a stent surface, the method comprising implanting Ti or N into the surface of the stent on a molecular or atomic level, followed by implanting TiN over the Ti or N, and followed by forming a layer of a TiN_xO_y compound over at least some of the areas where TiN has been implanted.

2. A stent comprising:

a first region having Ti or N implanted on a molecular or atomic level at a depth within at least a region of a surface of the stent;

a second region over the first region, and the second region having TiN implanted on a molecular or atomic level at a depth within at least a region of the surface of the stent; and

a layer of TiN_xO_y compound over the second region.

3. The stent of claim 2, wherein x is 1 and y is 1 or 2.

4. The stent of claim 2, wherein some of the TiN_xO_y compound is implanted on a molecular or atomic level at a depth within at least some of the area of the stent with the layer of the TiN_xO_y compound, and wherein the depth of the implanted TiN_xO_y compound is not greater than about 2000 Å

from the surface of the stent.

5. The stent of claim 2, wherein the layer of TiN_xO_y is exposed on the surface of the stent.

6. The stent of claim 5, wherein x is 1 and y is 1 or 2.

7. The stent of claim 5, wherein the layer of TiN_xO_y compound is not more than about 48,000 Å

in thickness.

8. The stent of claim 2, wherein the stent is made from stainless steel.

9. The stent of claim 2, wherein the surface is the tissue-contacting surface of the stent.