Magnetic alignment apparatus for a transcutaneous transfer system

• US 7,856,986 B2
• Filed: 06/14/2004
• Issued: 12/28/2010
• Est. Priority Date: 06/13/2003
• Status: Active Grant

• Current Assignee: Cochlear Limited
• Original Assignee: Cochlear Limited
• Inventors: Darley, Derek Ian
• Primary Examiner(s): Marmor, II; Charles A
• Assistant Examiner(s): Hopkins; Christine D
• Application Number:
  US10/866,034
• Publication Number:
  US 20040260362A1
• Time in Patent Office: 2,388 Days
• Field of Search: 128/899, 128/897, 600 25- 28, 607/57, 607/61, 607/115, 623/10
• US Class Current: 128/899
• CPC Class Codes: A61N 1/08 Arrangements or circuits for monitoring, protecting, controlling or indicating for external stimulators A61N1/3603; for implantable neurostimulators A61N1/36128; for heart stimulators A61N1/37; for defibrillators A61N1/3925
• CPC Class Codes: A61N 1/36038 Cochlear stimulation
• CPC Class Codes: A61N 1/3787 from an external energy source

Abstract

In one embodiment of the invention, a transcutaneous transfer system is disclosed. The system comprises: an inductively-coupled coil system comprising an external and an internal coil adapted to be transcutaneously juxtaposed along a coupling axis; an internal magnet fixed relative to the internal coil; an external magnet assembly coupled to the external coil; and an apparatus to securely retain the magnet assembly in a desired one of a plurality of positions along a longitudinal axis substantially parallel to the coupling axis in response to tool-less manipulation of the apparatus.

Claims

1. A transcutaneous transfer system comprising:

an external and an internal coil adapted to be transcutaneously juxtaposed along a coupling axis;

an internal magnet fixed relative to said internal coil;

an external magnet assembly coupled to said external coil; and

a control element, comprising a hand-operated control member, configured to allow, without movement of the external coil, manual adjustment and retention of said external magnet assembly in a desired one of a plurality of positions along a longitudinal axis substantially parallel to said coupling axis.

2. The system of claim 1, wherein said external magnet assembly comprises:

an external magnet; and

a magnet cover configured to at least partially house said external magnet.

3. The system of claim 2, wherein said external magnet and said magnet cover are separate integrated elements.

4. The system of claim 1, wherein said control element comprises:

a differential mechanism configured to allow manual adjustment of said magnet assembly in response to manipulation of the hand-operated control member; and

a displacement mechanism configured to restrict said magnet assembly displacements to those which are substantially parallel with said longitudinal axis.

5. The system of claim 4, wherein said control element further comprises:

a differential control member comprising a sleeve adapted to slidingly receive said magnetic assembly, and the hand-operated control member, wherein the hand-operated control member is disposed on an exterior surface of said differential control member; and

a housing, fixedly secured to said external coil and having an interior volume in which said magnet assembly and differential control member are at least partially disposed;

and wherein said magnet assembly is cylindrical.

6. The system of claim 5, wherein said differential mechanism comprises:

a differential channel disposed on an exterior surface of said magnet assembly; and

a differential arm that extends inwardly from an interior surface of said differential control member sleeve to engage said differential channel, wherein said differential channel is configured such that tool-less rotation of said differential control member causes a longitudinal displacement of said magnet assembly.

7. The system of claim 6, wherein said differential channel has a spiral configuration.

8. The system of claim 6, wherein said differential channel is formed in at least a portion of an exterior surface of said magnet assembly.

9. The system of claim 6, wherein said sleeve extends at least partially around said external magnet assembly.

10. The system of claim 6, wherein said housing comprises a slide aperture through which said hand-operated control member extends so as to be accessible to a recipient, wherein the manipulation of said hand-operated control member causes said differential control member to rotate.

11. The system of claim 6, wherein said control element further comprises:

a displacement guide channel disposed in an interior wall of said housing so as to be substantially parallel with said longitudinal axis; and

a displacement guide arm extending from a surface of said magnet cover to engage said displacement guide channel, wherein said displacement guide arm is disposed in and travels along said displacement guide channel in response to manipulation of said differential control member, thereby restricting said magnet assembly to displacements.

12. The system of claim 1, wherein said external and internal magnets are secured to their respective coils such that when said magnets are aligned with each other so too are said respective coils.

13. The system of claim 12, wherein said internal and external magnets are centrally located relative to their respective internal and external coils.

14. The system of claim 1, wherein said control element is self-contained.

15. The system of claim 1, wherein said transcutaneous transfer system is implemented in an implantable device.

16. The system of claim 15, wherein said implantable device is a cochlear implant system.

17. A magnetic alignment apparatus for use in a transcutaneous transfer system comprising an inductively-coupled coil system comprising an external and an internal coil adapted to be transcutaneously juxtaposed along a coupling axis;

an internal magnet fixed relative to the internal coil and an external magnet assembly coupled to said external coil, said apparatus comprising;

a cylindrical magnet cover configured to at least partially house said external magnet to form a magnet assembly, said cylindrical magnet cover having a differential channel disposed thereon;

a differential control member comprising a sleeve adapted to slidingly receive said magnetic assembly, a user control member disposed on at least a portion of an exterior surface of said control member, and a differential arm extending from an interior surface of said sleeve to be disposed in said differential channel; and

a housing comprising an interior volume in which at least a portion of said magnet assembly and differential control member are disposed, and a slide aperture through which a hand-operated control member extends, wherein rotation of said hand-operated control member causes an orthogonal displacement of said magnet assembly along a longitudinal axis substantially parallel to a coupling axis in response to manipulation of said apparatus.

18. The system of claim 17, wherein said transcutaneous transfer system is implemented in an implantable device.

19. The system of claim 18, wherein said implantable device is a cochlear implant system.

20. A transcutaneous transfer system comprising:

an external and an internal coil adapted to be transcutaneously juxtaposed along a coupling axis;

an internal magnet fixed relative to said internal coil;

a magnet assembly coupled to said external coil; and

a control element, comprising a hand-operated control member, configured to allow manual adjustment and retention of said magnet assembly, without movement of the external coil, in a desired one of a plurality of positions along a longitudinal axis substantially parallel to said coupling axis.

21. The system of claim 20, wherein said magnetic assembly comprises:

an external magnet; and

a magnet cover configured to house said external magnet.

22. The system of claim 20, wherein the control element comprises:

differential means for adjusting the position of said magnet assembly in response to the manipulation of the hand-operated control member; and

displacement means for restricting magnet assembly displacements to those which are substantially parallel with said longitudinal axis.

23. A transcutaneous transfer system, having an internal coil coupled to an internal magnet and external coil coupled along a coupling axis to an external magnet, the external magnet disposed in a housing, comprising:

means for receiving a manual adjusting force from an operator;

means for translating said external magnet in said housing in a desired one of a plurality of positions along a longitudinal axis substantially parallel to said coupling axis in response to said manual adjusting force from the operator;

means for transferring said adjusting force to said means for translating;

means for guiding the translating of said external magnet along the longitudinal axis; and

means for incrementally moving said external magnet within said housing.

24. The system of claim 23, wherein said means for incrementally moving said external magnet comprise screw-threading.

25. The system of claim 23, wherein said means for incrementally moving said external magnet comprise serrations.

26. The system of claim 23, wherein said transcutaneous transfer system is implemented in an implantable device.

27. The system of claim 26, wherein said implantable device is a cochlear implant system.