Double helical antenna assembly for a wireless intravascular medical device
First Claim
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1. A medical device comprising:
- a power source comprising a transmitter antenna and a radio frequency transmitter that generates a radio frequency signal which is applied to the transmitter antenna;
an antenna assembly having a first coil adapted for engaging tissue inside an animal and for receiving the radio frequency signal, wherein the first coil has a first end and a second end spaced along a longitudinal axis, and includes a first winding wound helically from the first end to the second end, and a second winding connected to the a first winding at the second end and wound helically from the second end to the first end;
wherein the first winding and the second winding of the first coil are unsupported by other components of the medical device; and
an active electronic circuit implantable in the animal and connected to the antenna assembly and having a power supply that derives electrical power from a signal received by the antenna assembly.
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Abstract
A medical device, such as a cardiac pacing device for an animal, includes an intravascular antenna that has a first coil for engaging a wall of a first blood vessel to receive a radio frequency signal. The first coil includes a first winding wound helically in a rotational direction along a longitudinal axis from a first end of the coil to a second end. A second winding that is connected to the a first winding at the second end, is wound helically in the same rotational direction along the longitudinal axis from the second end to the first end. An electronic circuit is implanted in the animal and is connected to the antenna to receive an electrical signal therefrom.
92 Citations
19 Claims
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1. A medical device comprising:
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a power source comprising a transmitter antenna and a radio frequency transmitter that generates a radio frequency signal which is applied to the transmitter antenna; an antenna assembly having a first coil adapted for engaging tissue inside an animal and for receiving the radio frequency signal, wherein the first coil has a first end and a second end spaced along a longitudinal axis, and includes a first winding wound helically from the first end to the second end, and a second winding connected to the a first winding at the second end and wound helically from the second end to the first end; wherein the first winding and the second winding of the first coil are unsupported by other components of the medical device; and an active electronic circuit implantable in the animal and connected to the antenna assembly and having a power supply that derives electrical power from a signal received by the antenna assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A medical device comprising:
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a receiver antenna having coil of electrically conductive material, wherein the coil has a collapsed state to enable insertion into an animal and an expanded state adapted to engage tissue inside the animal to secure the antenna in place wherein the coil of the receiver antenna in the expanded state is unsupported by other components of the medical device; and an electronic circuit adapted for implanting into the animal and connected to the receiver antenna, the electronic circuit comprising a plurality of electrodes adapted to contact tissue of the animal, an electrical storage device for storing electrical energy from a radio frequency signal received by the receiver antenna, a stimulation control circuit which determines when stimulation of tissue of the animal is needed, and a pulse circuit that responds to the stimulation control circuit by applying voltage from the electrical storage device across the plurality of electrodes. - View Dependent Claims (16, 17, 18, 19)
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Specification