Telemetry apparatus and method for an implantable medical device
First Claim
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1. A method for transmitting and receiving radio-frequency signals in an implantable cardiac rhythm management device, comprising:
- sensing intrinsic cardiac electrical activity from an intravascular therapy lead;
transmitting or receiving a modulated radio-frequency carrier at a specified frequency to or from an antenna incorporated into the therapy lead; and
, transmitting the modulated radio-frequency carrier in the form of telemetry bursts made synchronous with detected intrinsic cardiac electrical activity.
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Abstract
An apparatus and method for enabling radio-frequency communications with an implantable medical device utilizing far-field electromagnetic radiation. Such radio-frequency communications can take place over much greater distances than with inductively coupled antennas.
245 Citations
20 Claims
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1. A method for transmitting and receiving radio-frequency signals in an implantable cardiac rhythm management device, comprising:
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sensing intrinsic cardiac electrical activity from an intravascular therapy lead;
transmitting or receiving a modulated radio-frequency carrier at a specified frequency to or from an antenna incorporated into the therapy lead; and
,transmitting the modulated radio-frequency carrier in the form of telemetry bursts made synchronous with detected intrinsic cardiac electrical activity. - View Dependent Claims (2, 3, 4, 5, 6, 7)
delivering cardiac pacing pulses through the therapy lead; and
,transmitting the modulated radio-frequency carrier in the form of telemetry bursts made synchronous with cardiac pacing pulses.
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3. The method of claim 1 further comprising emitting a significant portion of radio-frequency energy delivered to the antenna at the specified frequency as far-field radiation.
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4. The method of claim 1 wherein the wavelength of the radio-frequency carrier is approximately four times or less the electrical length of the antenna.
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5. The method of claim 1 further comprising adjusting the electrical length of the antenna by loading the antenna with inductance or capacitance using a tuning circuit.
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6. The method of claim 1 further comprising transmitting the radio-frequency signal at a wavelength that corresponds to a resonant frequency of the antenna.
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7. The method of claim 1 further comprising employing the housing as a ground plane for the antenna.
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8. A method for transmitting and receiving radio-frequency signals in an implantable cardiac rhythm management device, comprising:
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delivering cardiac pacing pulses through an intravascular therapy lead; and
,transmitting or receiving a modulated radio-frequency carrier at a specified frequency to or from an antenna incorporated into the therapy lead; and
,transmitting the modulated radio-frequency carrier in the form of telemetry bursts made synchronous with cardiac pacing pulses. - View Dependent Claims (9, 10)
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11. An implantable cardiac rhythm management device, comprising:
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a housing for containing electronic circuitry;
rhythm control circuitry electrically connected by one or more conductors within a therapy lead to an electrode adapted for disposition within the heart;
an antenna extending from the housing, wherein the antenna is formed by the conductors of the therapy lead;
circuitry within the housing for transmitting or receiving a modulated radio-frequency carrier at a specified frequency to or from the antenna, wherein the circuitry transmits the modulated radio-frequency carrier in the form of telemetry bursts made synchronous with detected intrinsic cardiac electrical activity from the therapy lead. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification