Folded monopole antenna for implanted medical device
First Claim
1. An RF telemetry antenna system for communications between an external programmer and an implantable medical device, said system comprising:
- an implantable medical device housing including a conductive, metal housing portion defining an internal volume and a dielectric housing portion defining an internal volume;
a self-resonating, monopole RF antenna contained within the internal volume defined by said dielectric portion of said medical device housing, said monopole antenna having a free end and connection end; and
an internal transmitter/receiver circuit having a ground reference located within the metal housing portion that is connected to the metal housing portion such that the metal housing portion acts as a ground plane;
wherein the monopole RF antenna has an elongate form with at least one folded portion and is conformed inside the internal volume defined by the dielectric housing portion, wherein transmissions from the at least one folded portion are receivable outside the dielectric housing portion, andwherein the connection end of the antenna is connected to the internal transmitter/receiver circuit.
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Accused Products
Abstract
A folded monopole RF telemetry antenna is contained within a dielectric portion of an implantable medical device housing, which dielectric portion can be a biocompatible epoxy. The monopole antenna is formed from a wire or strip of conductive material which may be conformed inside the outer boundary of the epoxy housing. One end of the monopole antenna is free inside the epoxy, the other end of the antenna is electrically coupled to the circuit ground which, in turn, is connected to the metal housing portion, acting as a ground plane. The length of the antenna can be sized to be self-resonating at a frequency of about 403.5 MHz with at least a 3 MHz bandwidth.
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Citations
28 Claims
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1. An RF telemetry antenna system for communications between an external programmer and an implantable medical device, said system comprising:
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an implantable medical device housing including a conductive, metal housing portion defining an internal volume and a dielectric housing portion defining an internal volume; a self-resonating, monopole RF antenna contained within the internal volume defined by said dielectric portion of said medical device housing, said monopole antenna having a free end and connection end; and an internal transmitter/receiver circuit having a ground reference located within the metal housing portion that is connected to the metal housing portion such that the metal housing portion acts as a ground plane; wherein the monopole RF antenna has an elongate form with at least one folded portion and is conformed inside the internal volume defined by the dielectric housing portion, wherein transmissions from the at least one folded portion are receivable outside the dielectric housing portion, and wherein the connection end of the antenna is connected to the internal transmitter/receiver circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An implantable medical device, comprising:
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a housing having a dielectric portion defining an internal volume and a metal portion defining an internal volume; a transmitter/receiver circuit located within the housing; and an elongate monopole RF antenna, with a connection end, a free end and at least one fold between the connection end and the free end, operably connected to the transmitter/receiver circuit and positioned entirely within the dielectric portion internal volume such that the free end is closer to the connection end than the at least one fold. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. An implantable medical device, comprising:
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a housing having a dielectric portion, defining an internal volume and including a curved region, and a metal portion defining an internal volume; a transmitter/receiver circuit located within the housing; and an elongate monopole RF antenna, with at least one fold and first and second arcuate portions that extend along the curved region in first and second planes that are substantially parallel to one another, operably connected to the transmitter/receiver circuit and positioned entirely within the dielectric portion internal volume.
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23. An implantable medical device, comprising:
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a housing having a dielectric portion defining an internal volume and a metal portion defining an internal volume; a transmitter/receiver circuit, located within the housing, including a ground reference connected to the metal portion of the housing; a tissue stimulation circuit located within the housing; and an elongate antenna with at least one folded portion operably connected to the transmitter/receiver circuit and positioned within the dielectric portion such that transmissions from the at least one folded portion are receivable outside the dielectric portion. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification