Inductive Charger with Magnetic Shielding
First Claim
1. An external device for use with an implantable medical device, comprising:
- a housing;
a coil within the housing;
a rechargeable battery within the housing; and
a magnetic shield within the housing comprising a high permeability material,wherein the magnetic shield is located between the battery and the coil, andwherein the coil is used to provide power to the implantable medical device.
1 Assignment
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Accused Products
Abstract
To recharge an implanted medical device, an external device, typically in the form of an inductive charger, is placed over the implant to provide for transcutaneous energy transfer. The external charging device can be powered by a rechargeable battery. Since the battery is in close proximity to the charge coil, the large magnetic field produced by the charge coil induces eddy currents that flow on the battery'"'"'s metallic case, often resulting in undesirable heating of the battery and reduced efficiency of the charger. This disclosure provides a means of shielding the battery from the magnetic field to reduce eddy current heating, thereby increasing efficiency. In one embodiment, the magnetic shield consists of one or more thin ferrite plates. The use of a ferrite shield allows the battery to be placed directly over the charge coil as opposed to outside the extent of the charge coil.
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Citations
24 Claims
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1. An external device for use with an implantable medical device, comprising:
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a housing; a coil within the housing; a rechargeable battery within the housing; and a magnetic shield within the housing comprising a high permeability material, wherein the magnetic shield is located between the battery and the coil, and wherein the coil is used to provide power to the implantable medical device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An external device for use with an implantable medical device, comprising:
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a housing; a coil within the housing; a rechargeable battery within the housing; and a magnetic shield within the housing comprising a plurality of plates made of a high permeability material, wherein the magnetic shield is located between the battery and the coil, and wherein the coil is used to provide power to the implantable medical device. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An external device for use with an implantable medical device, comprising:
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a housing; a coil within the housing; a rechargeable battery within the housing; and a magnetic shield within the housing comprising a box made of a high permeability material, wherein the box covers the battery, wherein the magnetic shield and battery are within the extent of the coil, and wherein the coil is used to provide power to the implantable medical device. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification