Housing for implantable medical device

• US 20080103556A1
• Filed: 10/31/2006
• Published: 05/01/2008
• Est. Priority Date: 10/31/2006
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Grevious, John J., Li, Bernard Q., Paidosh, Chris J., Davis, Timothy J., Perz, Leroy
• Granted Patent: US 8,380,311 B2
• Time in Patent Office: Days
• US Class Current: 607/61
• 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

a second portion formed from a second material;

wherein at least one of the first material and the second material comprise a titanium alloy and the first material has a higher resistivity than the second material.

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-1 V.

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. An implantable neurological stimulation device comprising:

a housing comprising a first portion and a second portion; 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, the first portion provided proximate the coil and having a higher resistivity than the second portion.

22. The implantable neurological stimulation device of claim 21, wherein the first portion has a generally planar configuration.

23. The implantable neurological stimulation device of claim 21, wherein the first portion is welded to the second portion.

24. The implantable neurological stimulation device of claim 21, 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.

25. The implantable neurological stimulation device of claim 24, 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-3A1-2.5V, Ti-6Al-4V, Ti-8Al-1Mo-1V and combinations thereof.

26. The implantable neurological stimulation device of claim 24, wherein the second titanium material is commercial pure titanium Grade 1.

27. The implantable neurological stimulation device of claim 24, 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-3A1-2.5V, Ti-6Al-4V, Ti-8Al-1Mo-1V and combinations thereof.

28. The implantable neurological stimulation device of claim 21, wherein the second portion has a wall thickness of between approximately 0.001 and 0.016 inches.

29. The implantable neurological stimulation device of claim 21, wherein at least a portion of the housing has a radius of curvature of between approximately 0.1 and 2.5 millimeters.

30. The implantable neurological stimulation device of claim 21, wherein the second titanium material has better formability than the first material.

31. The implantable neurological stimulation device of claim 21, wherein the coil is a recharging coil.

32. The implantable neurological stimulation device of claim 21, wherein the coil is a telemetry coil.

33. 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, the first titanium material having a higher resistivity than the second titanium material; and

providing a coil within the housing;

wherein the first member is provided proximate the coil.

34. The method of claim 33, further comprising removing a portion of the second member to form an aperture therein.

35. The method of claim 33, wherein the first member is coupled to the second member at the location of the aperture.

36. The method of claim 33, wherein the step of coupling the first member to the second member comprises welding the first member to the second member.

37. The method of claim 33, 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.

38. The method of claim 33, 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.

39. The method of claim 33, 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.

40. The method of claim 33, wherein the second titanium material has better formability than the first titanium material.

41. The method of claim 33, wherein the second titanium material has greater percent elongation at room temperature as compared to the first titanium material.

42. The method of claim 33, wherein the coil is a telemetry coil.

43. The method of claim 33, wherein the coil is a recharging coil.