US 12,420,101 B2
Multipole magnet for medical implant system
Nathan Isaacson, Macquarie University (AU); and Anthony Powell, Macquarie University (AU)
Assigned to Cochlear Limited, Macquarie University (AU)
Appl. No. 17/753,165
Filed by Cochlear Limited, Macquarie University (AU)
PCT Filed Sep. 23, 2020, PCT No. PCT/IB2020/058898
§ 371(c)(1), (2) Date Feb. 22, 2022,
PCT Pub. No. WO2021/059163, PCT Pub. Date Apr. 1, 2021.
Claims priority of provisional application 62/907,044, filed on Sep. 27, 2019.
Prior Publication US 2022/0331598 A1, Oct. 20, 2022
Int. Cl. A61N 1/372 (2006.01); A61N 1/05 (2006.01)
CPC A61N 1/37223 (2013.01) [A61N 1/0541 (2013.01)] 54 Claims
OG exemplary drawing
 
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.