Focused power transfer for implantable medical device
First Claim
1. An implantable medical device, comprising:
- a housing having a major length, the housing comprising;
a first side comprising a first portion and a second portion, wherein the first portion defines a first window having an outer dimension, the first window comprising an electromagnetically transparent material, wherein the second portion comprises a conductive metal, and wherein the first window outer dimension is less than or equal to half of the housing major length;
a receiving coil enclosed by the housing, the receiving coil extending adjacent to and aligned with the first window; and
a rechargeable cell configured to be charged by the receiving coil when the receiving coil is exposed to a subwavelength focused electromagnetic field that traverses the first window with a focal pattern size that is less than the first window outer dimension.
1 Assignment
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Accused Products
Abstract
A rechargeable cell of an implantable medical device is recharged by an external charging unit that includes a transmitting coil configured to emit an electromagnetic field and a near-field focusing plate having a subwavelength structure pattern that focuses the emitted electromagnetic field to a focal pattern. The implantable medical device includes a housing having a window of an electromagnetically transparent material and a receiving coil enclosed by the housing. The receiving coil extends adjacent to and is aligned with the window. The rechargeable cell is enclosed by the housing and is configured to be charged by current induced in the receiving coil when the receiving coil is exposed to the focal pattern. In some examples, the near-field focusing plate is configured to produce the focal pattern to have a size that is less than an outer dimension of the window and a focal length from the near-field focusing plate that at least reaches the window.
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Citations
14 Claims
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1. An implantable medical device, comprising:
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a housing having a major length, the housing comprising; a first side comprising a first portion and a second portion, wherein the first portion defines a first window having an outer dimension, the first window comprising an electromagnetically transparent material, wherein the second portion comprises a conductive metal, and wherein the first window outer dimension is less than or equal to half of the housing major length; a receiving coil enclosed by the housing, the receiving coil extending adjacent to and aligned with the first window; and a rechargeable cell configured to be charged by the receiving coil when the receiving coil is exposed to a subwavelength focused electromagnetic field that traverses the first window with a focal pattern size that is less than the first window outer dimension. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification