MRI-Safe and Force-Optimized Implantable Ring Magnet System with an Enhanced Inductive Link
a ring magnet and inductive link technology, applied in the field of permanent magnet arrangement, can solve problems such as magnetic resonance imaging, imaging artifacts, damage to adjacent tissue in the patient,
Inactive Publication Date: 2020-11-05
MED EL ELEKTROMEDIZINISCHE GERAETE GMBH
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Benefits of technology
The patent describes a segmented magnet that can be used to create a ring-shaped magnet. The magnet has multiple magnetic sections that can be magnetized in different directions to create a strong magnetic field. This design can be made safe for use in the body and has the same magnetic and MRI properties as a traditional ring-shaped magnet.
Problems solved by technology
One problem arises when the patient undergoes Magnetic Resonance Imaging (MRI) examination.
Among other things, this may damage the adjacent tissue in the patient.
The attachment magnet 202 may also cause imaging artifacts in the MRI image, as well as there are maybe induced voltages in the receiving coil creating hearing artifacts.
This is especially an issue with MRI field strengths exceeding 1.5 Tesla.
Thus, for existing implant systems with magnet arrangements, it is common to either not permit MRI, or at most limit use of MRI to lower field strengths.
However, there is no suggestion that such therapeutic arrangements might potentially have any utility for magnetic attachment applications such as those described above.
Method used
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[0020]Various embodiments of the present invention are directed to an improved implant attachment magnet arrangement that reverses the conventional structure. Instead of a cylinder-shaped attachment magnet surrounded by a ring-shaped receiver coil, embodiments of the present invention have a center receiver coil surrounded by a ring-shaped attachment magnet with one overall or locally varying magnetic dipole moment orientations. One advantage of the invention is, that the ring shape of the attachment magnet distributes the attractive magnetic holding force exerted to the external attractive magnetic holding part to a larger area around the center coil, compared to the conventional design where the attractive magnetic holding force is exerted to the external part from the small center magnet to a small area around the coil center only. Another advantage is, that the receiver and transmitter coils for transcutaneous transmission may use the area up to the transmitter or receiver coil ...
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A magnetic system for a medical implant system is described. A planar implant receiver coil is configured to lie underneath and parallel to overlying skin of an implanted patient for transcutaneous communication of an implant communications signal. A planar ring-shaped attachment magnet also is configured to lie underneath and parallel to the overlying skin and radially surrounds the receiver coil. The attachment magnet is characterized by a magnetic field configured to avoid creating torque on the attachment magnet in the presence of an external magnetic field.
Description
[0001]This application claims priority from U.S. Provisional Patent Application 62 / 540,117, filed Aug. 2, 2017, which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to medical implants, and more specifically to a permanent magnet arrangement for use in such implants.BACKGROUND ART[0003]Some implants such as for example Vestibular Implants, (VI's), Middle Ear Implants (MEI's) and Cochlear Implants (CI's) employ attachment magnets in the implantable part and an external part to hold the external part magnetically in place over the implant. For example, as shown in FIG. 1, a typical cochlear implant system may include an external transmitter housing 101 containing transmitting coils 107 and an external attachment magnet 105. The external attachment magnet 105 has a conventional coin-shape and a north-south magnetic dipole that is perpendicular to the skin of the patient to produce external magnetic field lines M1 as shown. ...
Claims
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IPC IPC(8): A61N1/08A61N1/36A61N1/372A61N1/375
CPCA61N1/37229A61N1/375A61N1/086A61N1/36038A61N1/08A61N1/36142A61N1/36036
Inventor EIGENTLER, THOMAS WILHELMHOFNER, ANDREASHOCHMAIR, INGEBORG
Owner MED EL ELEKTROMEDIZINISCHE GERAETE GMBH