Medical Devices and Method for Making the Same

• US 20100228334A1
• Filed: 12/21/2009
• Published: 09/09/2010
• Est. Priority Date: 09/26/2003
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: Stinson, Jonathan S.
• Granted Patent: US 8,137,614 B2
• Time in Patent Office: Days
• US Class Current: 623/1.150
• CPC Class Codes: A61F 2240/001 Designing or manufacturing processes
• CPC Class Codes: A61F 2310/00023 Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00089 Zirconium or Zr-based alloys
• CPC Class Codes: A61F 2310/00095 Niobium or Nb-based alloys
• CPC Class Codes: A61F 2310/00101 Molybdenum or Mo-based alloys
• CPC Class Codes: A61F 2310/00131 Tantalum or Ta-based alloys
• CPC Class Codes: A61L 31/022 Metals or alloys
• CPC Class Codes: C22C 14/00 Alloys based on titanium

Abstract

Medical devices, such as stents, and methods of the devices are described.

Claims

1. A balloon-expandable medical stent, comprising:

a generally tubular body including an alloy having Ti at about 20 weight percent or more and about 40 weight percent or more of Ta, the alloy having a yield strength of about 45 ksi or more, a magnetic susceptibility of about +1 or less, and a mass absorption coefficient of about 1.9 cm²/g or more.

2. The stent of claim 1 wherein the alloy has a UTS of about 90 ksi or more and the percent tensile elongation is about 40 or more.

3. The stent of claim 1 wherein the yield strength is about 50 ksi or greater, the percent strength to peak load is about 30 or greater, the UTS is about 90 ksi or greater, and the percent strength to fracture is about 40 or greater.

4. The stent of claim 1 wherein the magnetic susceptibility is about 3.5×

10<sup>−

3</sup> or less.

5. The stent of claim 1 wherein the mass absorption coefficient is about 2.9 cm²/g or less.

6. The stent of claim 1 wherein the alloy includes about 50 weight percent Ti or greater.

8. The stent of claim 1 wherein the alloy includes 80 weight percent or less of Zr, Ta or Mo or a combination thereof.

9. The stent of claim 1 wherein the alloy includes 10 weight percent or more of Zr.

12. The stent of claim 1 wherein the alloy includes about 75 weight percent or less of Ta.

13. The stent of claim 1 wherein the alloy includes about 3 weight percent or more of Mo.

14. The stent of claim 1 wherein the alloy includes about 20 weight percent or less of Mo.

15. The stent of claim 1 wherein the alloy is Ti—

Ta, Ti—

Ta—

Mo, Ti—

Ta—

Zr, or Ti—

Ta—

Zr—

Mo.

16. The stent of claim 1 wherein the alloy is of CP titanium, Ti-6Al-4V, or Ti-6Al-4V ELI alloyed with 40 to 70 weight percent of Ta.

17. The stent of claim 16 where the alloy includes 5 to 20 weight percent of Mo.

19. The stent of claim 1 wherein the tubular body includes wall portions having a thickness of about 0.0015 inch to about 0.0150 inch.

20. The stent of claim 1 wherein the tubular body includes a therapeutic agent.

7. (canceled)

10. A balloon-expandable medical stent, comprising:

a generally tubular body including an alloy having Ti at about 20 weight percent or more and about 50 weight percent of Zr, the alloy having a yield strength of about 45 ksi or more, a magnetic susceptibility of about +1 or less, and a mass absorption coefficient of about 1.9 cm²/g or more.

11. (canceled)

18. (canceled)

21. (canceled)

22. An implantable medical device, comprising:

an alloy having Ti at about 20 weight percent or more and 20 weight percent or more of at least one of Zr, Ta, or Mo, with the proviso that the alloy includes at least about 3 weight percent of Mo, the alloy having a yield strength of about 45 ksi or more, a magnetic susceptibility of about +1 or less, and a mass absorption coefficient of about 1.9 cm²/g or more, the medical device selected from a filter, a guidewire, a catheter, a needle, a biopsy needle, a staple, and a cannula.

41. The implantable medical device of claim 22, wherein the alloy includes about 50 weight percent Ti or greater.

42. The implantable medical device of claim 22, wherein the implantable medical device is a balloon expandable stent.

23-40. -40. (canceled)