Telemetry apparatus and method for an implantable medical device
First Claim
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1. An implantable medical device, comprising:
- a housing for containing electronic circuitry;
an antenna extending from the housing;
circuitry within the housing for transmitting or receiving a modulated radio-frequency carrier at a specified frequency to or from the antenna; and
, wherein the electrical length of the antenna is approximately one-quarter wavelength or greater of the radio-frequency carrier at the specified frequency.
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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.
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Citations
30 Claims
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1. An implantable medical device, comprising:
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a housing for containing electronic circuitry;
an antenna extending from the housing;
circuitry within the housing for transmitting or receiving a modulated radio-frequency carrier at a specified frequency to or from the antenna; and
,wherein the electrical length of the antenna is approximately one-quarter wavelength or greater of the radio-frequency carrier at the specified frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for transmitting and receiving radio-frequency signals in an implantable medical device, comprising:
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transmitting or receiving a modulated radio-frequency carrier at a specified frequency to or from an antenna extending from a housing for the device; and
,transmitting the radio-frequency signal at a wavelength that is approximately four times or less the electrical length of the antenna. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An implantable medical device, comprising:
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a housing for containing electronic circuitry;
an antenna dimensioned such that a significant portion of radio-frequency energy delivered to it at a specified frequency is emitted as far-field radiation;
circuitry within the housing for transmitting or receiving a modulated radio-frequency carrier at the specified frequency to or from the antenna; and
,a tuning circuit for matching the impedance of the antenna to a transmitter or receiver and altering the effective electrical length of the antenna. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. 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 the conductors of the therapy lead;
wherein the conductors within a proximal portion of the therapy lead are arranged so as to form a non-radiating transmission line section of the lead that can be coiled without affecting a radiating antenna section of the lead; and
,circuitry within the housing for transmitting or receiving a modulated radio-frequency carrier at a specified frequency to or from the antenna. - View Dependent Claims (28)
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29. 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 the conductors of the therapy lead;
wherein the conductors within a distal portion of the lead adjacent to the electrode are arranged to form a filter section that blocks the transmission of radio-frequency energy to or from the electrode; and
,circuitry within the housing for transmitting or receiving a modulated radio-frequency carrier at a specified frequency to or from the antenna.
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30. 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 the conductors of the therapy lead;
wherein the conductors within a distal portion of the lead adjacent to the electrode are arranged to form a notch filter section that blocks the transmission of radio-frequency energy at a specified frequency band to or from the electrode; and
,circuitry within the housing for transmitting or receiving a modulated radio-frequency carrier at a specified frequency to or from the antenna.
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Specification