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 battery within the housing; and
a magnetic shield within the housing comprising a high permeability material; and
a printed circuit board (PCB) within the housing of the external device, wherein the magnetic shield and coil are located on a first side of the PCB, and the battery is located on a second side of the PCB,wherein the coil, the magnetic shield, and the battery are co-axially aligned in a stack, wherein the magnetic shield is located between the battery and the coil in the stack, andwherein the coil generates a magnetic field to provide power to the implantable medical device.
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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.
40 Citations
20 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 battery within the housing; and a magnetic shield within the housing comprising a high permeability material; and a printed circuit board (PCB) within the housing of the external device, wherein the magnetic shield and coil are located on a first side of the PCB, and the battery is located on a second side of the PCB, wherein the coil, the magnetic shield, and the battery are co-axially aligned in a stack, wherein the magnetic shield is located between the battery and the coil in the stack, and wherein the coil generates a magnetic field to provide power to the implantable medical device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An external device for use with an implantable medical device, comprising:
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a housing; a coil within the housing; a battery within the housing; a magnetic shield within the housing made of a high permeability material, wherein the magnetic shield covers the battery; and a printed circuit board (PCB) within the housing of the external device, wherein the PCB has a cutout area to accommodate the battery and magnetic shield, wherein the magnetic shield and battery are within the extent of the coil, and wherein the coil generates a magnetic field to provide power to the implantable medical device. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An external device for use with an implantable medical device, comprising:
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a housing; a coil within the housing; a battery within the housing; a magnetic shield within the housing comprising a high permeability material; and a printed circuit board (PCB) within the housing of the external device, wherein the magnetic shield and battery are located on a first side of the PCB, and the coil is located on a second side of the PCB, wherein the magnetic shield is located between the battery and the coil, and wherein the coil generates a magnetic field to provide power to the implantable medical device. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification