Telemetry antennas for medical devices and medical devices including telemetry antennas
In an embodiment, an antenna for a medical device, e.g., an implantable medical device (IMD), comprises an electrically conductive wire that spirals to form a three-dimensional shape of a rectangular cuboid. In another embodiment, the antenna comprises an electrically conductive wire that spirals to form a three-dimensional shape of an elliptical cylinder, an oval cylinder, an elongated pentagonal prism, an elongated hexagonal prism, or some other shape where the longitudinal diameter of the antenna is greater than the lateral diameter of the antenna. The antennas are sized to fit within a portion of a header of the medical device. Such antennas are designed to provide increased antenna gain and antenna bandwidth.
1. A medical device, comprising:
a housing including a mating surface having a feed-through opening;
telemetry circuitry within the housing;
a header mechanically affixed to the mating surface of the housing;
one or more connectors within the header that is/are configured to receive a proximal end of one or more leads; and
an antenna within the header;
wherein the antenna is electrically connected to the telemetry circuitry within the housing;
wherein the antenna spirals about a central axis and has a rectangular cuboid circumferential shape; and
wherein the central axis, about which the antenna spirals, is perpendicular to the mating surface of the housing.
2. The medical device of claim 1 , further comprising:
therapy circuitry, within the housing, electrically connected to the one or more connectors within the header;
wherein the therapy circuitry is configured to control stimulation that is deliverable via electrodes of one or more leads connected to the one or more connectors.
3. The medical device of claim 1 , wherein:
a longitudinal diameter and a lateral diameter of the antenna, which are perpendicular to one another, cross one another at the central axis; and
the longitudinal diameter is greater than the lateral diameter;
the central axis about which the antenna spirals, which is perpendicular to the mating surface, is also perpendicular to each of the longitudinal diameter of the antenna and the lateral diameter of the antenna.
4. The medical device of claim 1 , wherein:
a longitudinal diameter and a lateral diameter of the antenna cross one another at the central axis; and
the longitudinal diameter is substantially equal to the lateral diameter.
5. The medical device of claim 4 , wherein the housing is electrically conductive and acts as a ground plane for the antenna, with the mating surface of the housing being a portion of the ground plane that is closest to the antenna.
6. The medical device of claim 1 , wherein an antenna gain and an antenna bandwidth of the antenna having the rectangular cuboid circumferential shape are greater than an antenna gain and an antenna bandwidth of a helical antenna having a right circular cylinder circumferential shape that could fit within the header.
7. The medical device of claim 1 , wherein a volume occupied by the antenna having the rectangular cuboid circumferential shape is greater than a volume that could be occupied by a helical antenna having a right circular cylinder circumferential shape that could fit within the header.
8. The medical device of claim 1 , wherein the antenna is wound about a spindle having a rectangular cuboid shape.
9. The medical device of claim 8 , wherein the rectangular cuboid shaped spindle includes six sides, wherein adjacent sides meet one another to form edges, and wherein at least some of the edges are curved.
10. The medical device of claim 9 , wherein the antenna is formed by an electrically conductive wire that is wound about the spindle.
11. The medical device of claim 10 , wherein the wire that forms the antenna includes straight portions and curved portions.
12. The medical device of claim 1 , wherein the medical device is implantable.
13. The medical device of claim 12 , wherein the medical device comprises an implantable neurostimulator.
14. A medical device, comprising:
a housing including a mating surface having a feed-through opening;
telemetry circuitry within the housing;
a header mechanically affixed to the mating surface of the housing;
one or more connectors within the header that is/are configured to receive a proximal end of one or more leads; and
an antenna within the header;
wherein the antenna is electrically connected to the telemetry circuitry within the housing;
wherein the antenna spirals about a central axis to form a three-dimensional shape including a longitudinal diameter, a lateral diameter and a height; and
wherein the longitudinal diameter of the antenna is greater than the lateral diameter of the antenna; and
wherein the central axis, about which the antenna spirals, is perpendicular to the mating surface of the housing, perpendicular to the longitudinal diameter of the antenna, perpendicular to the lateral diameter of the antenna, and parallel to the height of the antenna.
15. The medical device of claim 14 , wherein the three-dimensional shape of the antenna comprises a rectangular cuboid.
16. The medical device of claim 14 , wherein the three-dimensional shape of the antenna is selected from the group consisting of:
an elliptic cylinder;
an oval cylinder;
an elongated pentagonal prism;
an elongated hexagonal prism;
an elongated heptagonal prism;
an elongated octagonal prism;
an elongated nonagonal prism;
an elongated decagonal prism; and
an elongated hendecagonal prism.
17. The medical device of claim 14 , wherein at least a portion of the housing is electrically conductive and acts as a ground plane for the antenna.
18. The medical device of claim 14 , wherein the medical device is implantable.
19. The medical device of claim 18 , wherein the medical device comprises an implantable neurostimulator.
20. An antenna for a medical device, comprising:
an electrically conductive wire that spirals to form a three-dimensional shape of a rectangular cuboid.
21. The antenna of claim 20 , wherein a longitudinal diameter of the rectangular cuboid is greater than a lateral diameter of the rectangular cuboid.
22. The antenna of claim 20 , wherein a longitudinal diameter of the rectangular cuboid is substantially equal to a lateral diameter of the rectangular cuboid.
23. The antenna of claim 20 , wherein the antenna is sized to fit within a portion of a header of an implantable medical device.
24. An antenna for a medical device, comprising:
an electrically conductive wire that spirals to form a three-dimensional shape including a longitudinal diameter, a lateral diameter and a height;
wherein the longitudinal diameter of the antenna is greater than the lateral diameter of the antenna;
wherein the antenna includes a first end and a second end;
wherein the first end of the antenna is electrically connected to circuitry within a housing of the medical device by a conductor that extends from the first end of the antenna through a feed-through opening in the housing; and
wherein the second end of the antenna is a free end.
25. The antenna of claim 24 , wherein the three-dimensional shape of the antenna comprises a rectangular cuboid.
26. The antenna of claim 24 , wherein the three-dimensional shape of the antenna is selected from the group consisting of:
an elliptic cylinder;
an oval cylinder;
an elongated pentagonal prism;
an elongated hexagonal prism;
an elongated heptagonal prism;
an elongated octagonal prism;
an elongated nonagonal prism;
an elongated decagonal prism; and
an elongated hendecagonal prism.
27. The antenna of claim 24 , wherein the antenna is sized to fit within a portion of a header of an implantable medical device.
28. The medical device of claim 1 , wherein:
the antenna includes a first end and a second end;
the first end of the antenna is electrically connected to the telemetry circuitry by a conductor that extends from the first end of the antenna through the feed-through opening in the mating surface of the housing; and
the second end of the antenna is a free end.
29. The medical device of claim 1 , wherein the free end of the antenna is located a distance from the mating surface of the housing, the distance being approximately equal to a height of the antenna.
30. The medical device of claim 14 , wherein:
the antenna includes a first end and a second end;
the first end of the antenna is electrically connected to the telemetry circuitry by a conductor that extends from the first end of the antenna through the feed-through opening in the mating surface of the housing; and
the second end of the antenna is a free end.
31. The medical device of claim 30 , wherein the free end of the antenna is located a distance from the mating surface, the distance being approximately equal to the height of the antenna.
32. The antenna of claim 24 , wherein:
the antenna spirals about a central axis to form the three-dimensional shape including the longitudinal diameter, the lateral diameter and the height; and
the central axis is perpendicular to a surface of the housing having the feed-through opening.