System and method for charging a power cell in an implantable medical device
First Claim
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1. A method for charging a power cell in an implantable medical device (IMD), comprising:
- providing an electrical pulse to an inductor external to the IMD;
measuring a first frequency of an oscillation signal induced in the inductor by the electrical pulse; and
driving the inductor with a drive signal operative to induce a current in the IMD, the induced current operative to charge the power cell of the IMD, the drive signal having a second frequency based on the measured first frequency of the oscillation signal.
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Abstract
Apparatus and methods for charging a power cell in an implantable medical device (“IMD”) are disclosed herein. In one embodiment, a method includes providing an electrical pulse to an inductor external to the IMD. A frequency of an oscillation signal induced in the inductor by the current pulse is measured. The inductor is driven with an oscillating signal having a frequency based on the measured frequency of the oscillation signal. The power cell is charged using current induced in the IMD by the driving of the inductor.
31 Citations
25 Claims
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1. A method for charging a power cell in an implantable medical device (IMD), comprising:
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providing an electrical pulse to an inductor external to the IMD; measuring a first frequency of an oscillation signal induced in the inductor by the electrical pulse; and driving the inductor with a drive signal operative to induce a current in the IMD, the induced current operative to charge the power cell of the IMD, the drive signal having a second frequency based on the measured first frequency of the oscillation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for charging a rechargeable power cell in an implantable medical device (IMD), comprising:
a recharging device external to the IMD, the recharging device comprising; a primary coil configured to generate a magnetic field operative to induce flow of recharging current in the IMD; a pulse generator configured to drive a pulse into the primary coil operative to induce an oscillation signal in the primary coil; a signal generator configured to drive a drive signal across the primary coil at a first frequency based on a second frequency of the oscillation signal; and a frequency measurement system configured to measure the second frequency of the oscillation signal. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A charger for transcutaneously recharging an implanted power cell, comprising:
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a primary coil configured to generate a magnetic field that induces flow of recharging current in a secondary coil of an implanted medical device (IMD); a signal generator configured to; drive a pulse into the primary coil operative to induce an oscillation signal in the primary coil; drive a drive signal into the primary coil, a first frequency of the drive signal based on a second frequency of the oscillation signal; and
todrive a sweep signal across the primary coil, a start frequency and an end frequency of the sweep signal based on the second frequency of the oscillation signal. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification