Implantable medical device and electrical stimulation device with magnetic shield
First Claim
1. An implantable medical device, comprising:
- a housing having an interior cavity;
electronics carried in the housing interior cavity and configured to perform a medical therapy;
a rechargeable power source;
a secondary charging coil, having a winding with an axis and a major plane orthogonal to the axis, operatively coupled to the electronics and the rechargeable power source; and
a magnetic shield being approximately perpendicular to the axis of the secondary charging coil and being located between the charging coil and the electronics;
wherein the major plane of the secondary coil is positioned completely distal to the magnetic shield relative to the electronics; and
wherein the magnetic shield is positioned completely proximal to the electronics relative to the major plane of the secondary 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 rechargable 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.
88 Citations
28 Claims
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1. An implantable medical device, comprising:
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a housing having an interior cavity; electronics carried in the housing interior cavity and configured to perform a medical therapy; a rechargeable power source; a secondary charging coil, having a winding with an axis and a major plane orthogonal to the axis, operatively coupled to the electronics and the rechargeable power source; and a magnetic shield being approximately perpendicular to the axis of the secondary charging coil and being located between the charging coil and the electronics; wherein the major plane of the secondary coil is positioned completely distal to the magnetic shield relative to the electronics; and wherein the magnetic shield is positioned completely proximal to the electronics relative to the major plane of the secondary coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An implantable electrical stimulation device, comprising:
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a housing having an interior cavity; electronics carried in the housing interior cavity and configured to perform a medical therapy; an electrical lead operatively coupled to the electronics; a rechargeable power source; a charging coil, having a winding with an axis and a major plane orthogonal to the axis, operatively coupled to the electronics and the rechargeable power source; and a magnetic shield being approximately perpendicular to the axis of the secondary charging coil and being located between the charging coil and the electronics; wherein the major plane of the secondary coil is positioned completely distal to the magnetic shield relative to the electronics; and wherein the magnetic shield is positioned completely proximal to the electronics relative to the major plane of the secondary coil. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification