Implantable lead-based sensor powered by piezoelectric transformer
First Claim
1. An implantable medical device comprising:
- a battery to deliver a first voltage derived exclusively from the battery, wherein the battery is adapted to be implanted internally relative to a patient'"'"'s skin;
a piezoelectric transformer to convert the first voltage to a second voltage greater than the first voltage;
a sensor powered by the second voltage; and
an implantable lead, wherein the sensor and the piezoelectric transformer are disposed within the implantable lead.
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Accused Products
Abstract
In general, the invention is directed to an IMD having a piezoelectric transformer to power a lead-based sensor. The IMD powers the piezoelectric transformer with a low amplitude signal. The piezoelectric transformer serves to convert the voltage level of the low amplitude signal to a higher voltage level to drive the sensor produced by a battery in the IMD to voltage levels appropriate for IMD operation. A piezoelectric transformer offers small size and low profile, as well as operational efficiency, and permits the IMD to transmit a low amplitude signal to a remote sensor deployed within an implantable lead. In addition, the piezoelectric transformer provides electrical isolation that reduces electromagnetic interference among different sensors.
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Citations
26 Claims
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1. An implantable medical device comprising:
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a battery to deliver a first voltage derived exclusively from the battery, wherein the battery is adapted to be implanted internally relative to a patient'"'"'s skin; a piezoelectric transformer to convert the first voltage to a second voltage greater than the first voltage; a sensor powered by the second voltage; and
an implantable lead, wherein the sensor and the piezoelectric transformer are disposed within the implantable lead. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An implantable medical device comprising:
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a battery to deliver a first voltage derived exclusively from the battery wherein the battery is adapted to be implanted internally relative to a patient'"'"'s skin; 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 sensor powered by the second voltage; an implantable lead, wherein the sensor and the piezoelectric transformer are disposed within the lead. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. An implantable medical lead comprising:
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a lead body comprising a conductor adapted to be coupled to a battery implanted internally relative to a patient'"'"'s skin; a piezoelectric transformer within the lead body; and a sensor within the lead body and electrically coupled to the piezoelectric transformer, wherein the piezoelectric transformer includes a first resonator that generates mechanical vibration in response to an input signal derived from a voltage delivered exclusively by the battery, and a second resonator that generates an output signal in response to the mechanical vibration, and the sensor is powered by the second voltage. - View Dependent Claims (21)
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22. A method for use in an implanted medical device system comprising:
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converting a first voltage derived exclusively from a battery implanted internally relative to a patient'"'"'s skin to a second voltage with a piezoelectric transformer, wherein the second voltage is greater than the first voltage; and applying the second voltage to a sensor within the implanted medical device system, wherein the sensor and the piezoelectric transformer are disposed within an implantable lead of the implanted medical device system. - View Dependent Claims (23, 24, 25)
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26. An implantable cardiac electrical stimulation device, comprising:
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a battery to deliver a first voltage derived exclusively from the battery, wherein the battery is adapted to be implanted internally relative to a patient'"'"'s skin; an input circuit to receive the first voltage and generate an input signal; 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 sensor powered by the output signal; and an implantable lead, wherein the sensor and the piezoelectric transformer are disposed within the lead.
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Specification