POWER LINK FOR IMPLANTABLE DEVICES

• US 20100312310A1
• Filed: 02/07/2008
• Published: 12/09/2010
• Est. Priority Date: 10/30/2007
• Status: Active Grant

• Current Assignee: Cochlear Limited
• Original Assignee: Cochlear Limited
• Inventors: Meskens, Werner
• Granted Patent: US 8,923,968 B2
• Time in Patent Office: Days
• US Class Current: 607/61
• CPC Class Codes: A61N 1/3787 from an external energy source
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 2310/23 The load being a medical device, a medical implant, or a life supporting device
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

A power transfer system for an implanted device, such as an implanted medical device. The implanted device and a power transfer device each include a coil with a magnetically permeable core, so that operatively the coils are magnetically coupled, so as to improve the efficiency of power transfer. The coil resides in an electrically conductive implant case

Claims

1-19. -19. (canceled)

20. An implantable medical device system, comprising:

a first hermetically sealed casing that is at least partially conductive;

first and second inductively coupled elements each comprising an inductive coil disposed about a magnetically permeable core;

wherein the first element is disposed in the casing, and the second element is disposed external to the casing, and wherein the first and second elements provide transfer of power across the at least partially conductive casing.

21. The implantable medical device system of claim 20, wherein the at least partially conductive casing is formed from a non-magnetic, relatively low electrical conductive material, and wherein the first and second elements are operable at a relatively low frequency in transferring power across the casing.

22. The implantable medical device system of claim 21, wherein the first casing is made from titanium or an alloy thereof.

23. The implantable medical device system of claim 20, wherein the first casing is a casing for an active implantable medical device, and wherein the system further comprises:

an implantable power supply device comprising a second casing; and

wherein the second element is disposed in the second casing.

24. The implantable medical device system of claim 23, wherein the active implantable medical device and the implantable power supply device are operatively mechanically connected.

25. The implantable medical device system of claim 24, wherein at least one of the inductive coils is connected to the active implantable medical device or the implantable power supply device by a cable.

26. The implantable medical device system of claim 23, wherein the implantable power supply device comprises a battery.

27. The implantable medical device system of claim 23, wherein the active implantable medical device is a cochlear implant.

28. The implantable medical device system of claim 20, wherein the first casing is a casing for an implantable power supply device, and wherein the system further comprises:

an external power transfer device comprising a second casing; and

wherein the second element is disposed in the second casing.

29. The implantable medical device system of claim 20, wherein the first and second conductive elements each comprises at least one capacitor.

30. The implantable medical device system of claim 20, wherein the magnetically permeable core is formed from a ferrimagnetic material.

31. The implantable medical device system of claim 30, wherein the ferrimagnetic material is ferrite.

32. A power transfer system for an implantable device system having a first hermetically sealed casing that is at least partially conductive, the power transfer system comprising:

first and second inductively coupled elements each comprising an inductive coil disposed about a magnetically permeable core

wherein the first element is disposed in the casing, and the second element is disposed external to the casing, and wherein the first and second elements provide transfer of power across the at least partially conductive casing.

33. The system according to claim 32, wherein the first casing is formed from non-magnetic relatively low electrical conductive material.

34. The system of claim 33, wherein the first casing formed from titanium or an alloy thereof.

35. The system according to claim 33, wherein the first casing is formed from more than one different non-magnetic relatively low electrical conductive materials.

36. The system of claim 32, wherein the first and second conductive elements each comprise at least one capacitor.

37. The system of claim 32, wherein the magnetically permeable core is formed from a ferrimagnetic material.

38. The system of claim 37, wherein the ferrimagnetic material is ferrite.

39. An implantable device, comprising:

a hermetically sealed casing that is at least partially conductive;

a first element configured to inductively couple with a second element, wherein each of the first and second element comprise an inductive coil disposed about a magnetically permeable core;

wherein the first element is disposed in the casing, and the second element is disposed external to the casing, and wherein the first element is configured to inductively couple with the second element to provide transfer of power across the at least partially conductive casing.

40. The implantable device of claim 39, wherein the at least partially conductive casing is formed from a non-magnetic, relatively low electrical conductive material, and wherein the first element is configured to operate with the seond element at a relatively low frequency in transferring power across the casing.

41. The implantable device of claim 40, wherein the first casing is made from titanium or an alloy thereof.

42. The implantable device of claim 40, wherein the device is an active implantable medical device.

43. The implantable device of claim 42, wherein the device is a cochlear implant.

44. The implantable device of claim 40, wherein the device is an implantable power supply device.

45. The implantable medical device of claim 39, wherein the first and second conductive elements each comprises at least one capacitor.

46. The implantable medical device of claim 39, wherein the magnetically permeable core is formed from a ferrimagnetic material.

47. The implantable medical device of claim 41, wherein the ferrimagnetic material is ferrite.