Housing for implantable medical device

• US 8,380,311 B2
• Filed: 10/31/2006
• Issued: 02/19/2013
• Est. Priority Date: 10/31/2006
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Li, Bernard Q., Grevious, John J., Davis, Timothy J., Perz, Leroy, Paidosh, Chris J.
• Primary Examiner(s): Getzow, Scott
• Assistant Examiner(s): PATTON, AMANDA K
• Application Number:
  US11/590,250
• Publication Number:
  US 20080103556A1
• Time in Patent Office: 2,303 Days
• Field of Search: 607/2, 607 36- 37
• US Class Current: 607/36
• CPC Class Codes: A61L 31/022 Metals or alloys
• CPC Class Codes: A61N 1/37512 Pacemakers

Abstract

A housing for an implantable medical device includes a first portion formed from a first material and a second portion formed from a second material. The first material and the second material comprise titanium and the first material has a higher resistivity than the second material.

Claims

1. A housing for an implantable medical device comprising:

a first portion formed from a first material and aligned with a coil provided within the housing; and

a second portion formed from a second material that differs from the first material;

wherein the first material and the second material each comprise titanium and the first material has a higher resistivity than the second material; and

wherein the second portion includes an aperture extending entirely through a generally planar region of a wall thereof at a first location, and the first portion is coupled to the second portion at the first location to seal the aperture, such that the first portion forms a part of the wall.

2. The housing of claim 1, wherein the first portion has a generally planar configuration.

3. The housing of claim 1, wherein the first portion is welded to the second portion.

4. The housing of claim 1, wherein the second material comprises commercial pure Grade 1 titanium.

5. The housing of claim 4, wherein the first material comprises an alloy having the formula Ti-4.5Al-3V-2Fe-2Mo-0.15O.

6. The housing of claim 4, wherein the first material comprises an alloy having the formula Ti-4Al-2.5V-1.5Fe-0.25O.

7. The housing of claim 4, wherein the first material comprises an alloy having the formula Ti-6Al-2Sn-4Zr-2Mo.

8. The housing of claim 4, wherein the first material comprises an alloy having the formula Ti-3Al-2.5V.

9. The housing of claim 4, wherein the first material comprises an alloy having the formula Ti-6Al-4V.

10. The housing of claim 4, wherein the first material comprises an alloy having the formula Ti-8Al-1Mo-1V.

11. The housing of claim 4, wherein the first material comprises a titanium matrix composite.

12. The housing of claim 1, wherein the first material is an alloy selected from the group consisting of Ti-4.5Al-3V-2Fe-2Mo-0.15O, Ti-4Al-2.5V-1.5Fe-0.25O, Ti-6Al-2Sn-4Zr-2Mo, Ti-3Al-2.5V, Ti-6Al-4V, Ti-8Al-1Mo-1V and combinations thereof.

13. The housing of claim 12, wherein the second material is an alloy selected from the group consisting of Ti-4.5Al-3V-2Fe-2Mo-0.15O, Ti-4Al-2.5V-1.5Fe-0.25O, Ti-6Al-2Sn-4Zr-2Mo, Ti-3Al-2.5V, Ti-6Al-4V, Ti-8Al-1Mo-1V and combinations thereof.

14. The housing of claim 1, wherein the second material is an alloy selected from the group consisting of Ti-4.5Al-3V-2Fe-2Mo-0.15O, Ti-4Al-2.5V-1.5Fe-0.25O, Ti-6Al-2Sn-4Zr-2Mo, Ti-3Al-2.5V, Ti-6Al-4V, Ti-8Al-1Mo-1V and combinations thereof.

15. The housing of claim 1, wherein the second portion has a wall thickness of between approximately 0.001 and 0.016 inches.

16. The housing of claim 1, wherein at least a portion of the housing has a radius of curvature of between approximately 0.1 and 2.5 millimeters.

17. The housing of claim 1, wherein the second material exhibits greater formability as compared to a Ti-6Al-4V alloy.

18. The housing of claim 1, wherein the second material has better formability than the first material.

19. The housing of claim 1, wherein the housing is configured for use as the housing for an implantable neurological stimulation device.

20. The housing of claim 1, wherein the housing exhibits improved telemetry performance as compared to a housing made entirely of commercial pure titanium Grade 1.

21. The housing of claim 1, wherein the first portion has a higher resistivity than the second portion.

22. The housing of claim 1, wherein the wherein the second portion is not formed from the first material.

23. The housing of claim 22, wherein the first portion is not formed from the second material.

24. An implantable neurological stimulation device comprising:

a housing comprising a first portion and a second portion, the first portion and the second portion defining different regions of an innermost surface of the housing; and

a coil provided within the housing;

wherein the first portion comprises a first titanium material and the second portion comprises a second titanium material different from the first titanium material, the first portion being provided proximate the coil and having a higher resistivity than the second portion.

25. The implantable neurological stimulation device of claim 24, wherein the first portion has a generally planar configuration.

26. The implantable neurological stimulation device of claim 24, wherein the first portion is welded to the second portion.

27. The implantable neurological stimulation device of claim 24, wherein the first titanium material is an alloy selected from the group consisting of Ti-4.5Al-3V-2Fe-2Mo-0.15O, Ti-4Al-2.5V-1.5Fe-0.25O, Ti-6Al-2Sn-4Zr-2Mo, Ti-3Al-2.5V, Ti-6Al-4V, Ti-8Al-1Mo-1V and combinations thereof.

28. The implantable neurological stimulation device of claim 27, wherein the second titanium material is an alloy selected from the group consisting of Ti-4.5Al-3V-2Fe-2Mo-0.15O, Ti-4Al-2.5V-1.5Fe-0.25O, Ti-6Al-2Sn-4Zr-2Mo, Ti-3Al-2.5V, Ti-6Al-4V, Ti-8Al-1Mo-1V and combinations thereof.

29. The implantable neurological stimulation device of claim 27, wherein the second titanium material is commercial pure titanium Grade 1.

30. The implantable neurological stimulation device of claim 27, wherein the second titanium material is an alloy selected from the group consisting of Ti-4.5Al-3V-2Fe-2Mo-0.15O, Ti-4Al-2.5V-1.5Fe-0.25O, Ti-6Al-2Sn-4Zr-2Mo, Ti-3Al-2.5V, Ti-6Al-4V, Ti-8Al-1Mo-1V and combinations thereof.

31. The implantable neurological stimulation device of claim 24, wherein the second portion has a wall thickness of between approximately 0.001 and 0.016 inches.

32. The implantable neurological stimulation device of claim 24, wherein at least a portion of the housing has a radius of curvature of between approximately 0.1 and 2.5 millimeters.

33. The implantable neurological stimulation device of claim 24, wherein the second titanium material has better formability than the first titanium material.

34. The implantable neurological stimulation device of claim 24, wherein the coil is a recharging coil.

35. The implantable neurological stimulation device of claim 24, wherein the coil is a telemetry coil.

36. A method of producing an implantable medical device comprising:

coupling a first member to a second member to form a housing, the first member comprising a first titanium material and the second member comprising a second titanium material that is different from the first titanium material, the first titanium material having a higher resistivity than the second titanium material;

removing a portion of the second member to form an aperture therein; and

providing a coil within the housing;

wherein the first member is provided proximate the coil, the aperture extends completely through a wall of the second member, and the first member is coupled to the second member at the aperture, such that the first member forms a part of the wall.

37. The method of claim 36, wherein the first member is coupled to the second member to seal the aperture.

38. The method of claim 36, wherein the step of coupling the first member to the second member comprises welding the first member to the second member.

39. The method of claim 36, wherein the first titanium material comprises Grade 1 titanium and the second titanium material is selected from the group consisting of Ti-4.5Al-3V-2Fe-2Mo-0.15O, Ti-4Al-2.5V-1.5Fe-0.25O, Ti-6Al-2Sn-4Zr-2Mo, Ti-3Al-2.5V, Ti-6Al-4V, Ti-8Al-1Mo-1V and combinations thereof.

40. The method of claim 36, wherein the first titanium material and the second titanium material are each selected from the group consisting of Ti-4.5Al-3V-2Fe-2Mo-0.15O, Ti-4Al-2.5V-1.5Fe-0.25O, Ti-6Al-2Sn-4Zr-2Mo, Ti-3Al-2.5V, Ti-6Al-4V, Ti-8Al-1Mo-1V and combinations thereof.

41. The method of claim 36, wherein the second titanium material is selected from the group consisting of Ti-4.5Al-3V-2Fe-2Mo-0.15O, Ti-4Al-2.5V-1.5Fe-0.25O, Ti-6Al-2Sn-4Zr-2Mo, Ti-3Al-2.5V, Ti-6Al-4V, Ti-8Al-1Mo-1V and combinations thereof.

42. The method of claim 36, wherein the second titanium material has better formability than the first titanium material.

43. The method of claim 36, wherein the second titanium material has greater percent elongation at room temperature as compared to the first titanium material.

44. The method of claim 36, wherein the coil is a telemetry coil.

45. The method of claim 36, wherein the coil is a recharging coil.