SYSTEMS FOR ENABLING TELEMETRY IN AN IMPLANTABLE MEDICAL DEVICE
First Claim
1. An implantable medical device, comprising:
- a telemetry circuit;
an implantable housing configured to contain at least a portion of the telemetry circuit;
an antenna electrically connected to the telemetry circuit, the antenna including a helical portion and a non-helical portion, the antenna configured to wirelessly transfer information electromagnetically using a specified range of operating frequencies and using an antenna mode having an off-axis radiation efficiency greater than or equal to an on-axis radiation efficiency;
wherein the axis is the longitudinal axis of the helical portion; and
wherein the helical portion is physically and electrically shorter than a quarter of a wavelength of an electromagnetic wave propagating through a tissue medium having a relative dielectric constant greater than a free space relative dielectric constant.
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Abstract
A system for enabling telemetry in implantable medical devices is provided. One aspect of this disclosure relates to an implantable medical device having radio-frequency telemetry capabilities. The device includes a housing and electronic circuitry contained within the housing. The device also includes an antenna connected to the electronic circuitry, the antenna having a helical portion and a whip portion, the whip portion separate from a feed conductor and adapted to enhance a radiation pattern of the antenna. According to various embodiments, the antenna and circuitry are adapted to facilitate transmission and reception of modulated radio-frequency energy at a specified carrier frequency. At least a portion of the antenna is embedded in a dielectric compartment, according to various embodiments. Other aspects and embodiments are provided herein.
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Citations
20 Claims
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1. An implantable medical device, comprising:
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a telemetry circuit; an implantable housing configured to contain at least a portion of the telemetry circuit; an antenna electrically connected to the telemetry circuit, the antenna including a helical portion and a non-helical portion, the antenna configured to wirelessly transfer information electromagnetically using a specified range of operating frequencies and using an antenna mode having an off-axis radiation efficiency greater than or equal to an on-axis radiation efficiency; wherein the axis is the longitudinal axis of the helical portion; and wherein the helical portion is physically and electrically shorter than a quarter of a wavelength of an electromagnetic wave propagating through a tissue medium having a relative dielectric constant greater than a free space relative dielectric constant.
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2. An implantable medical device, comprising:
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a telemetry circuit; an implantable housing configured to contain at least a portion of the telemetry circuit; and an antenna electrically connected to the telemetry circuit, the antenna including a helical portion and a non-helical portion, the antenna configured to wirelessly transfer information electromagnetically using a specified range of operating frequencies and using a mode having an off-axis radiation efficiency greater than or equal to an on-axis radiation efficiency, and wherein the axis is the longitudinal axis of the helical portion. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method, comprising:
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providing an implantable medical device comprising an antenna including a helical portion and a non-helical portion; providing an electrical connection between the antenna and a telemetry circuit, the telemetry circuit at least partially contained within a housing of the implantable medical device; transferring information wirelessly using the antenna and the telemetry circuit, the transferring using a specified range of operating frequencies and using an antenna mode having an off-axis radiation efficiency greater than or equal to an on-axis radiation efficiency; and wherein the axis is the longitudinal axis of the helical portion. - View Dependent Claims (17, 18, 19, 20)
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Specification