Implantable medical apparatus having an omnidirectional antenna for receiving radio frequency signals
First Claim
1. An antenna assembly by which a medical device receives a radio frequency signal that has a B field, said antenna assembly comprising:
- a body having a cylindrical surface;
a first antenna located on the cylindrical surface to receive a B field that is oriented in a first direction, the first antenna comprising a first conductive coil and a second conductive coil connected in series and spaced along a first axis; and
a second antenna located on the cylindrical surface to receive to receive a B field that is oriented in a second direction that is transverse to the first direction, the second antenna comprises a third conductive coil and a fourth conductive coil connected in series and spaced along a second axis that is transverse to the first axis.
1 Assignment
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Accused Products
Abstract
An radio frequency antenna assembly is provided for a medical device such as one capable of being implanted into a patient. The antenna assembly includes a plurality of antennas, each oriented to receive a radio frequency signal propagating along a different axis. This facilitates reception of the radio frequency signal regardless of the orientation of its propagation axis to the medical device. In other cases, the radio frequency signal has a plurality of components, each propagating along a different axis, and each antenna of the assembly receives a different one of those components. The individual electrical signals produced in each antenna are additively combined into a single signal having greater strength than each of the individual electrical signals.
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Citations
20 Claims
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1. An antenna assembly by which a medical device receives a radio frequency signal that has a B field, said antenna assembly comprising:
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a body having a cylindrical surface; a first antenna located on the cylindrical surface to receive a B field that is oriented in a first direction, the first antenna comprising a first conductive coil and a second conductive coil connected in series and spaced along a first axis; and a second antenna located on the cylindrical surface to receive to receive a B field that is oriented in a second direction that is transverse to the first direction, the second antenna comprises a third conductive coil and a fourth conductive coil connected in series and spaced along a second axis that is transverse to the first axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An antenna assembly by which a medical device that is implanted in a patient receives a radio frequency signal, wherein the radio frequency signal has at least a first B field, a second B field and a third B field each oriented in a different direction, said antenna assembly comprising:
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a body having a cylindrical surface; a first antenna oriented at the medical device so as to receive the first B field, and located on the cylindrical surface; a second antenna oriented at the medical device so as to receive the second B field, and located on the cylindrical surface and spaced 90°
circumferentially from the first antenna; anda third antenna oriented at the medical device so as to receive the third B field. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An antenna assembly by which a medical device implanted in a patient receives a radio frequency signal, wherein the medical device has a body with a cylindrical surface, said antenna assembly comprising:
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a first antenna located on the cylindrical surface to receive the radio frequency signal; and a second antenna located on the cylindrical surface and spaced 90°
circumferentially from the first antenna. - View Dependent Claims (17, 18, 19, 20)
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Specification