Housing for implantable medical device
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.
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.