IP Library › Granted Patent US 12,420,101
Granted Patent B2
US 12,420,101 · App. 17/753,165 · Granted Sep 23, 2025

Multipole magnet for medical implant system

Inventors: Nathan Isaacson (Macquarie University, AU); Anthony Powell (Macquarie University, AU)
Assignee: Cochlear Limited
A61N1/37223A61N1/0541
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Quick Facts
Patent No.
US 12,420,101
App. No.
17/753,165
Granted
Sep 23, 2025
Kind
B2
Abstract

An apparatus includes a housing configured to be placed over a portion of skin of a recipient, the portion of skin overlaying an implanted device. The apparatus further includes circuitry within the housing. The circuitry is configured to wirelessly communicate with the implanted device. The apparatus further includes a unitary magnet in mechanical communication with the housing. The magnet includes at least one first magnetic dipole moment having a first magnitude and a first direction and at least one second magnetic dipole moment having a second magnitude substantially equal to the first magnitude and a second direction substantially opposite to the first direction.

Claims (128)

1. An auditory prosthesis, comprising:

an external component including an external magnet; and

an internal component including an internal magnet, wherein

the external magnet is configured to interact with the internal magnet to provide sufficient magnetic force to retain the external component over the internal component,

the external magnet has two magnetic dipole moments,

the internal magnet has only two magnetic dipole moments,

the external component includes an inductor coil that encircles the external magnet and/or encircles a projection of the external magnet onto a plane defined by the inductor coil, and

at least one of:

(i) a first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet departs from parallel with a center axis of the external magnet by more than 5 degrees and departs from perpendicular with the center axis of the external magnet by more than 5 degrees and a second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet departs from parallel with the center axis of the external magnet by more than 5 degrees and departs from perpendicular with the center axis of the external magnet by more than 5 degrees;

the first and second magnetic dipole moments of the two magnetic dipole moments of the external magnet are oblique relative to one another;

the first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet has an equal magnitude to that of the second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet;

an axis of the first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet mirrors an axis of the second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet relative to a first plane coincident with the center axis of the external magnet; and

the axis of the first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet lies on a second plane coincident with the center axis of the external magnet and the axis of the second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet lies on the second plane coincident with the center axis of the external magnet; or

(ii) a first of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet departs from parallel with a center axis of the internal magnet by more than 5 degrees and departs from perpendicular with the center axis of the internal magnet by more than 5 degrees and a second of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet departs from parallel with the center axis of the internal magnet by more than 5 degrees and departs from perpendicular with the center axis of the internal magnet by more than 5 degrees;

the first and second magnetic dipole moments of the only two magnetic dipole moments of the internal magnet are oblique relative to one another;

the first of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet has an equal magnitude to that of the second of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet;

an axis of the first of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet mirrors an axis of the second of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet relative to a first plane coincident with the center axis of the internal magnet; and

the axis of the first of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet lies on a second plane coincident with the center axis of the internal magnet and the axis of the second of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet lies on the second plane coincident with the center axis of the internal magnet.

2. The auditory prosthesis of claim 1 , wherein the external magnet includes a third magnetic dipole moment, and the auditory prosthesis is configured so that the third magnetic dipole moment is at least substantially parallel to skin above the internal component.

3. The auditory prosthesis of claim 1 , wherein the external magnet has only two magnetic dipole moments.

4. The auditory prosthesis of claim 1 , wherein the external magnet includes only three magnetic dipole moments and a third of the only three magnetic dipole moments has a direction oblique to respective directions of the first and second magnetic dipole moments of the external magnet.

5. The auditory prosthesis of claim 1 , wherein the auditory prosthesis is configured so that the first of the two magnetic dipole moments of the external magnet has a direction falling within plus or minus 10 degrees from perpendicular to skin below the external component when the external component is magnetically coupled to the internal component when the internal component is implanted in a recipient.

6. The auditory prosthesis of claim 5 , wherein the auditory prosthesis is configured so that the second of the two magnetic dipole moments of the external magnet has a direction falling within plus or minus 10 degrees from perpendicular to skin below the external component when the external component is magnetically coupled to the internal component when the internal component is implanted in a recipient.

7. The auditory prosthesis of claim 1 , wherein the auditory prosthesis is configured so that the first of the only two magnetic dipole moments of the internal magnet has a direction falling within plus or minus 10 degrees from perpendicular to skin above the internal magnet when the external component is magnetically coupled to the internal component when the internal component is implanted in a recipient.

8. The auditory prosthesis of claim 1 , wherein the internal magnet comprises only two magnets.

9. The auditory prosthesis of claim 1 , wherein the internal magnet is a separable unitary member.

10. The auditory prosthesis of claim 1 , wherein the internal magnet is a non-separable unitary member.

11. The auditory prosthesis of claim 1 , wherein:

the internal component includes a stimulator unit and/or a stimulator/receiver unit; and

the auditory prosthesis includes a microphone.

12. The auditory prosthesis of claim 1 , wherein:

the auditory prosthesis includes a sound processor unit.

13. The auditory prosthesis of claim 1 , wherein:

the internal magnet is a means for generating a permanent magnetic field.

14. The auditory prosthesis of claim 1 , wherein:

the first of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet departs from parallel with the center axis of the internal magnet by more than 5 degrees and departs from perpendicular with the center axis of the internal magnetic by more than 5 degrees and the second of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet departs from parallel with the center axis of the internal magnet by more than 5 degrees and departs from perpendicular with the center axis of the internal magnet by more than 5 degrees;

the first and second magnetic dipole moments of the only two magnetic dipole moments of the internal magnet are oblique relative to one another;

the first of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet has an equal magnitude to that of the second of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet;

the axis of the first of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet mirrors an axis of the second of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet relative to the first plane coincident with the center axis of the internal magnet; and

the axis of the first of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet lies on the second plane coincident with the center axis of the internal magnet and the axis of the second of the magnetic dipole moments of the internal magnet lies on the second plane coincident with the center axis of the internal magnet.

15. The auditory prosthesis of claim 14 , wherein the internal magnet is disk shaped.

16. The auditory prosthesis of claim 1 , wherein:

the first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet is established by a distinct first magnet portion of the external magnet and the second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet is established by a distinct second magnet portion of the external magnet; and

the first of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet is established by a distinct first magnet portion of the internal magnet and the second of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet is established by a distinct second magnet portion of the internal magnet.

17. The auditory prosthesis of claim 1 , wherein:

the first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet and the second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet are established by a single portion of the external magnet; and

the first of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet and the second of the magnetic dipole moments of the only two magnetic dipole moments of the internal magnet are established by a single portion of the internal magnet.

18. An auditory prosthesis, comprising:

an external component including an external magnet; and

an internal component including an internal magnet, wherein

the external magnet is configured to interact with the internal magnet to provide sufficient magnetic force to retain the external component over the internal component,

the internal magnet comprises two portions having separate magnetic dipole moments, the two portions including a first portion that includes a first half of the internal magnet and a second portion that includes the second half of the internal magnet,

a first of the separate magnetic dipole moments departs from parallel with a center axis of the internal magnet by more than 5 degrees and departs from perpendicular with the center axis by more than 5 degrees and a second of the separate magnetic dipole moments departs from parallel with the center axis of the internal magnet by more than 5 degrees and departs from perpendicular with the center axis of the internal magnet by more than 5 degrees;

the first and second of the separate magnetic dipole moments of the two magnetic dipole moments of the internal magnet are oblique relative to one another;

the first of the separate magnetic dipole moments has an equal magnitude to that of the second of the separate magnetic dipole moments;

an axis of the first of the separate magnetic dipole moments mirrors an axis of the second of the separate magnetic dipole moments relative to a first plane coincident with the center axis of the internal magnet; and

the axis of the first of the separate magnetic dipole moments lies on a second plane coincident with the center axis and the axis of the second of the separate magnetic dipole moments lies on the second plane coincident with the center axis.

19. The auditory prosthesis of claim 18 , wherein the internal magnet is a non-separable unitary member.

20. The auditory prosthesis of claim 18 , wherein the internal magnet is a separable unitary member.

21. The auditory prosthesis of claim 18 , wherein the first portion can be separated from the second portion when the internal magnet is not mounted on or within a housing.

22. The auditory prosthesis of claim 21 , wherein the two portions can be joined or rejoined together prior to being placed in mechanical communication with other portions of the internal component.

23. The auditory prosthesis of claim 18 , wherein the two portions are configured to be repeatedly and reversibly separated from one another and repeatedly and reversibly rejoined to one another without damaging the internal magnet.

24. The auditory prosthesis of claim 18 , wherein the internal magnet is disk shaped.

25. The auditory prosthesis of claim 18 , wherein the external magnet has only one diametrically magnetized portion.

26. The auditory prosthesis of claim 25 , wherein the auditory prosthesis is configured so that the diametrically magnetized portion has a magnetic dipole moment with a direction parallel to skin plus or minus 10 degrees when the external component is magnetically coupled to the internal component when the internal component is implanted in a recipient.

27. The auditory prosthesis of claim 26 , wherein the diametrically magnetized portion is part of a compilation that further includes two magnet portions that have magnetic dipoles that extend at a non-zero angle more than 5 degrees relative to a magnetic dipole of the diametrically magnetized portion.

28. The auditory prosthesis of claim 25 , wherein the diametrically magnetized portion has a magnetic dipole moment with a direction parallel to skin plus or minus 10 degrees.

29. The auditory prosthesis of claim 28 , wherein the diametrically magnetized portion is part of a compilation that further includes two magnet portions that have magnetic dipoles that extend at an angle more than 5 degrees relative to a magnetic dipole of the diametrically magnetized portion.

30. The auditory prosthesis of claim 18 , wherein:

the external component includes an inductor coil that encircles the external magnet and/or encircles a projection of the external magnet onto a plane defined by the inductor coil.

31. The auditory prosthesis of claim 18 , wherein:

the auditory prosthesis includes a sound processor unit and a microphone.

32. The auditory prosthesis of claim 18 , wherein:

the internal component includes an elongate electrode assembly; and

the external component includes an external transmitter unit.

33. The auditory prosthesis of claim 18 , wherein the first of the separate magnetic dipole moments extends away from a surface of the internal magnet facing toward the external magnet at a first non-orthogonal angular direction, wherein the second of the separate magnetic dipole moments extends away from a surface of the internal magnet facing away from the external magnet at a second non-orthogonal angular direction.

34. The auditory prosthesis of claim 18 , wherein the first of the separate magnetic dipole moments departs from parallel with the center axis of the internal magnet by at least 10 degrees and departs from perpendicular with the center axis of the internal magnet by at least 10 degrees and the second of the separate magnetic dipole moments departs from parallel with the center axis of the internal magnet by at least 10 degrees and departs from perpendicular with the center axis by at least 10 degrees.

35. The auditory prosthesis of claim 18 , wherein:

the internal magnet comprises a unitary member with the two portions having separate magnetic dipoles.

36. The auditory prosthesis of claim 18 , wherein:

the internal magnet is a monolithic member with the two portions having separate magnetic dipoles.

37. The auditory prosthesis of claim 18 , wherein:

the internal magnet is a non-monolithic magnet.

38. The auditory prosthesis of claim 18 , wherein:

the internal magnet is such that the two portions comprise respectively a first magnet and a second magnet separate from the first magnet.

39. The auditory prosthesis of claim 18 , wherein:

the internal magnet is a non-monolithic apparatus made up by the two portions.

40. An auditory prosthesis, comprising:

an external component including an external magnet; and

an internal component including an internal magnet, wherein

the external magnet is configured to interact with the internal magnet to provide sufficient magnetic force to retain the external component over the internal component, and

at least one of:

(i) the external magnet comprises two magnetic dipole moments that depart from parallel and from perpendicular to a center axis of the external magnet, wherein a first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet departs from parallel with the center axis of the external magnet by more than 5 degrees and departs from perpendicular with the center axis of the external magnet by more than 5 degrees and a second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet departs from parallel with the center axis of the external magnet by more than 5 degrees and departs from perpendicular with the center axis of the external magnet by more than 5 degrees;

the first and second magnetic dipole moments of the two magnetic dipole moments of the external magnet are oblique relative to one another;

the first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet has an equal magnitude to that of the second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet;

an axis of the first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet mirrors an axis of the second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet relative to a first plane coincident with the center axis of the external magnet; and

the axis of the first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet lies on a second plane coincident with the center axis of the external magnet and the axis of the second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet lies on the second plane coincident with the center axis of the external magnet; or

(ii) the internal magnet comprises two magnetic dipole moments that depart from parallel and from perpendicular to a center axis of the internal magnet, wherein a first of the magnetic dipole moments of two magnetic dipole moments of the internal magnet departs from parallel with the center axis of the internal magnet by more than 5 degrees and departs from perpendicular with the center axis of the internal magnet by more than 5 degrees and a second of the magnetic dipole moments of the two dipole moments of the internal magnet departs from parallel with the center axis of the internal magnet by more than 5 degrees and departs from perpendicular with the center axis of the internal magnet by more than 5 degrees;

the first and second magnetic dipole moments of the two magnetic dipole moments of the internal magnet are oblique relative to one another;

the first of the magnetic dipole moments of the two magnetic dipole moments of the internal magnet has an equal magnitude to that of the second of the magnetic dipole moments of the two magnetic dipole moments of the internal magnet;

an axis of the first of the magnetic dipole moments of the two magnetic dipole moments of the internal magnet always mirrors an axis of the second of the magnetic dipole moments of the two magnetic dipole moments of the internal magnet relative to a first plane coincident with the center axis of the internal magnet; and

the axis of the first of the magnetic dipole moments of the two magnetic dipole moments of the internal magnet lies on a second plane coincident with the center axis of the internal magnet and the axis of the second of the magnetic dipole moments of the internal magnet lies on the second plane coincident with the center axis of the internal magnet.

41. The auditory prosthesis of claim 40 , wherein the two magnetic dipole moments of the internal magnet depart from parallel with the center axis by 10 degrees.

42. The auditory prosthesis of claim 40 , wherein the two magnetic dipole moments of the internal magnet depart from perpendicular with the center axis by 10 degrees.

43. The auditory prosthesis of claim 40 , wherein the external magnet is a unitary member and is a non-separable unitary member and/or the internal magnet is a unitary member and is a non-separable unitary member.

44. The auditory prosthesis of claim 40 , wherein the external magnet is a unitary member that is a separable unitary member and/or the internal magnet is a unitary member that is a separable unitary member.

45. The auditory prosthesis of claim 40 , wherein the external magnet comprises:

the two magnetic dipole moments that depart from parallel and from perpendicular to the center axis of the external magnet, wherein the first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet departs from parallel with the center axis of the external magnet by more than 5 degrees and departs from perpendicular with the center axis of the external magnet by more than 5 degrees and the second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet departs from parallel with the center axis of the external magnet by more than 5 degrees and departs from perpendicular with the center axis of the external magnet by more than 5 degrees, wherein

the first and second magnetic dipole moments of the two magnetic dipole moments of the external magnet are oblique relative to one another,

the first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet has the equal magnitude to that of the second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet,

the axis of the first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet mirrors the axis of the second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet relative to the first plane coincident with the center axis of the external magnet, and

the axis of the first of the magnetic dipole moments of the two magnetic dipole moments of the external magnet lies on the second plane coincident with the center axis of the external magnet and the axis of the second of the magnetic dipole moments of the two magnetic dipole moments of the external magnet lies on the second plane coincident with the center axis of the external magnet.

46. The auditory prosthesis of claim 40 , wherein the internal magnet comprises:

the two magnetic dipole moments that depart from parallel and from perpendicular to a center axis of the internal magnet, wherein the first of the magnetic dipole moments of two magnetic dipole moments of the internal magnet departs from parallel with the center axis of the internal magnet by more than 5 degrees and departs from perpendicular with the center axis of the internal magnet by more than 5 degrees and the second of the magnetic dipole moments of the two dipole moments of the internal magnet departs from parallel with the center axis of the internal magnet by more than 5 degrees and departs from perpendicular with the center axis of the internal magnet by more than 5 degrees, wherein

the first and second magnetic dipole moments of the two magnetic dipole moments of the internal magnet are oblique relative to one another,

the first of the magnetic dipole moments of the two magnetic dipole moments of the internal magnet has the equal magnitude to that of the second of the magnetic dipole moments of the two magnetic dipole moments of the internal magnet,

the axis of the first of the magnetic dipole moments of the two magnetic dipole moments of the internal magnet always mirrors the axis of the second of the magnetic dipole moments of the two magnetic dipole moments of the internal magnet relative to the first plane coincident with the center axis of the internal magnet, and

the axis of the first of the magnetic dipole moments of the two magnetic dipole moments of the internal magnet lies on the second plane coincident with the center axis of the internal magnet and the axis of the second of the magnet dipole moments of the two magnetic dipole moments of the internal magnet lies on the second plane coincident with the center axis of the internal magnet.

47. The auditory prosthesis of claim 40 , wherein the external component includes an inductor coil that encircles the external magnet and/or encircles a projection of the external magnet onto a plane defined by the inductor coil.

48. The auditory prosthesis of claim 40 , wherein the two magnetic dipole moments of the internal magnet depart from parallel with the center axis by at least 10 degrees and depart from perpendicular with the center axis by at least 10 degrees.

49. The auditory prosthesis of claim 40 , wherein:

the internal magnet is a means for generating a permanent magnetic field.

50. The auditory prosthesis of claim 40 , wherein the external magnet comprises two separate magnet portions respectively establishing the two magnetic dipole moments of the external magnet.

51. The auditory prosthesis of claim 40 , wherein the external magnet comprises three separate magnet portions respectively establishing the two magnetic dipole moments of the external magnet and a third magnetic dipole moment of the external magnet.

52. The auditory prosthesis of claim 40 , wherein the internal magnet comprises two separate magnet portions respectively establishing the two magnetic dipole moments of the internal magnet.

53. The auditory prosthesis of claim 40 , wherein the internal magnet has only two magnetic dipole moments and the external magnet has only three magnetic dipole moments.

54. The auditory prosthesis of claim 40 , wherein:

the auditory prosthesis includes a sound processor unit and a microphone.

Continuity (2)
Provisional Application 62907044 · Sep 27, 2019
Related Publication 20220331598A1 · Oct 20, 2022
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