FOCUSED POWER TRANSFER FOR IMPLANTABLE MEDICAL DEVICE
First Claim
1. An implantable medical device, comprising:
- a housing comprising a first window having an outer dimension, the first window comprising an electromagnetically transparent material;
a receiving coil enclosed by the housing, the receiving coil extending adjacent to and aligned with the first window;
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 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
36 Claims
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1. An implantable medical device, comprising:
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a housing comprising a first window having an outer dimension, the first window comprising an electromagnetically transparent material; a receiving coil enclosed by the housing, the receiving coil extending adjacent to and aligned with the first window; 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 window outer dimension. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An implantable medical device system, comprising:
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an external charging unit comprising; a power transfer control module configured to be coupled to an external power source; a transmitting coil configured to receive a drive signal from the power transfer control module and emit an electromagnetic field in response to the drive signal; a first near-field focusing plate comprising a subwavelength structure pattern that focuses the emitted electromagnetic field to a focal pattern; and an implantable medical device configured to deliver a therapy to a patient or sense a physiological signal of the patient, comprising; a housing comprising a first window having an outer dimension, the first window comprising an electromagnetically transparent material; a receiving coil enclosed by the housing, the receiving coil extending adjacent to and aligned with the first window; a rechargeable cell configured to be charged by the receiving coil when the receiving coil is exposed to the focal pattern through the first window, the first near-field focusing plate configured to produce the focal pattern to have a size that is less than the first window outer dimension. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. An implantable medical device system comprising:
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a first implantable medical device comprising; a housing comprising a magnetically transparent material; a receiving coil enclosed by the housing; and at least one of a therapy delivery module and sensing module; a second medical device comprising; a transmitting coil; a near-field focusing plate configured to focus a near-field electromagnetic field along a focal plane comprising the receiving coil; the at least one of the therapy delivery module and the sensing module configured to perform a therapy delivery or a sensing operation, respectively, in response to a current induced in the receiving coil by the focused near-field electromagnetic field.
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Specification