Implantable medical device with piezoelectric transformer
First Claim
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1. An implantable medical device comprising:
- a battery to deliver a first voltage; and
a piezoelectric transformer to convert the first voltage to a second voltage greater than the first voltage.
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Abstract
In general, the invention is directed to an IMD having a piezoelectric transformer to convert battery power to operating power. The piezoelectric transformer serves to convert voltage levels produced by a battery in the IMD to voltage levels appropriate for IMD operation. In contrast to electromagnetic transformers and charge pump arrays, a piezoelectric transformer offers small size and low profile, as well as operational efficiency. In addition, in an implantable cardiac or neurostimulation device, the piezoelectric transformer provides electrical isolation that avoids circuit-induced cross currents between different electrodes.
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Citations
32 Claims
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1. An implantable medical device comprising:
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a battery to deliver a first voltage; and
a piezoelectric transformer to convert the first voltage to a second voltage greater than the first voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An implantable medical device comprising:
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a battery to deliver a first voltage;
an input circuit to generate an input signal derived from the first voltage;
a piezoelectric transformer to convert the first voltage to a second voltage greater than the first voltage, wherein the piezoelectric transformer includes a first resonator that generates mechanical vibration in response to the input signal, and a second resonator that generates an output signal in response to the mechanical vibration;
a hold capacitor; and
a charging circuit that applies the output signal to charge the hold capacitor - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A method comprising:
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converting a first voltage to a second voltage with a piezoelectric transformer, wherein the second voltage is greater than the first voltage; and
applying the second voltage to charge a hold capacitor within an implantable medical device. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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Specification