Method for making an implantable medical device from a refractory metal

• US 5,765,418 A
• Filed: 12/06/1995
• Issued: 06/16/1998
• Est. Priority Date: 05/16/1994
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Rosenberg, Duane L.
• Primary Examiner(s): Larson, Lowell A.
• Assistant Examiner(s): BUTLER, RODNEY ALLEN
• Application Number:
  US08/568,028
• Time in Patent Office: 923 Days
• Field of Search: 72/39, 72/41, 72/42, 72/46, 72/47, 72/700
• US Class Current: 72/47
• CPC Class Codes: A61B 17/064 Surgical staples, i.e. penetrating the tissue
• 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: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2310/00023 Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00131 Tantalum or Ta-based alloys
• CPC Class Codes: A61L 31/082 Inorganic materials
• CPC Class Codes: A61L 31/14 Materials characterised by their function or physical properties , e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
• CPC Class Codes: B21C 37/042 Manufacture of coated wire or bars
• CPC Class Codes: B21F 45/008 of medical instruments, e.g. stents, corneal rings medical science A61

Abstract

A method for making an implantable medical device from a drawn refractory metal which has an improved biocompatible surface. The method includes coating a refractory metal article with platinum by a physical vapor deposition process and subjecting the coated article to drawing in a diamond die. The drawn article can be incorporated into an implantable medical device without removing the deposited metal.

Claims

1. A method for making an implantable medical device comprising the steps of:

(a) providing an elongated article of a metal selected from the group consisting of titanium, tantalum and alloys thereof;

(b) coating the metal article with a thin coating of platinum;

(c) subjecting the coated article to drawing in a diamond die and;

(d) incorporating the drawn article into an implantable medical device at a portion of the medical device intended for exposure to body tissue or body fluids without removing the coated platinum.

2. The method of claim 1 wherein the wire is of a ribbon-like configuration.

3. The method of claim 1 wherein the wire is a titanium alloy.

4. The method of claim 1 wherein the coating process is a physical vapor deposition process.

5. The method of claim 1 wherein the coating ranges in thickness from about 500 Å

to about 3000 Å

.

6. The method of claim 3 wherein the alloy is Ti64-6Al-4V.

7. A method for making an implantable medical device comprising the steps of:

(a) providing an elongated article of refractory metal;

(b) coating the refractory metal article with a biologically inert lubricant metal;

(c) subjecting the coated article to drawing in a diamond die; and

,

(d) incorporating the drawn article into an implantable medical device at a portion of the medical device intended for exposure to body tissue or body fluids without removing the coated metal.

8. The method of claim 7 wherein the article to be drawn is titanium wire.

9. The method of claim 7 wherein the coating process is a physical vapor deposition process.

10. The method of claim 7 wherein the coating ranges in thickness from about 500 Å

to about 3000Å

.

11. The method of claim 7 wherein the article to be drawn is tantalum wire.

12. The method of claim 7 wherein the biologically inert lubricant metal is platinum.

13. The method of claim 8 wherein the wire is of a ribbon-like configuration.

14. The method of claim 8 wherein the wire is a titanium alloy.

15. The method of claim 8 wherein the wire is of a ribbon-like configuration.

16. The method of claim 14 wherein the alloy is Ti64-6Al-4V.