Method of charging an implantable medical device
First Claim
1. A method of coupling electromagnetic flux from a primary charging coil, comprising the steps of:
- operatively coupling a secondary charging coil to an implantable medical device, said secondary charging coil having an axis, a first side and a second side opposite the first side;
positioning a magnetic shield between the secondary charging coil and the implantable medical device only on the first side of the secondary charging coil, the magnetic shield being approximately perpendicular to the axis of the secondary charging coil; and
coupling electromagnetic flux from the primary charging coil from the second side of the secondary charging coil.
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Abstract
A rechargeable implantable medical device with a magnetic shield placed on the distal side of a secondary recharging coil to improve charging efficiency is disclosed. The rechargeable implantable medical device can be a wide variety of medical devices such as neuro stimulators, drug delivery pumps, pacemakers, defibrillators, diagnostic recorders, cochlear implants. The implantable medical device has a secondary recharging coil carried over a magnetic shield and coupled to electronics and a rechargeable power source carried inside the housing. The electronics are configured to perform a medical therapy. Additionally a method for enhancing electromagnetic coupling during recharging of an implantable medical device is disclosed, and a method for reducing temperature rise during recharging of an implantable medical device is disclosed.
75 Citations
12 Claims
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1. A method of coupling electromagnetic flux from a primary charging coil, comprising the steps of:
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operatively coupling a secondary charging coil to an implantable medical device, said secondary charging coil having an axis, a first side and a second side opposite the first side; positioning a magnetic shield between the secondary charging coil and the implantable medical device only on the first side of the secondary charging coil, the magnetic shield being approximately perpendicular to the axis of the secondary charging coil; and coupling electromagnetic flux from the primary charging coil from the second side of the secondary charging coil.
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2. A method of charging of an implantable medical device with a primary charging coil, comprising the steps of:
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operatively coupling a secondary charging coil to the implantable medical device, said secondary charging coil having an axis, a first side and a second side opposite the first side; positioning a magnetic shield between the secondary charging coil and the implantable medical device only on the first side of the secondary charging coil, the shield being approximately perpendicular to the axis of the secondary charging coil; and applying electromagnetic flux from the primary charging coil from the second side of the secondary charging coil. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification