Wireless intravascular medical device with a double helical antenna assembly
First Claim
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1. A medical device comprising:
- an antenna having a first coil adapted for engaging a wall of a first blood vessel of an animal to receive a radio frequency signal, wherein the first coil has a first end and a second end, and includes a first winding wound helically in a rotational direction along a longitudinal axis from a first terminus at the first end to the second end, and a second winding connected to the a first winding in a U-shaped section at the second end and wound helically in the rotational direction along the longitudinal axis from the second end to a second terminus at the first end;
a detector connected to the first coil for converting the radio frequency signal into a direct current;
an electrical storage device connected to the detector for storing electrical energy;
a plurality of electrodes adapted to contact with at least one blood vessel of the animal;
a stimulation control circuit which determines when stimulation of tissue of the animal is needed;
a pulse circuit which responds to the stimulation control circuit by applying voltage from the electrical storage device across the plurality of electrodes; and
a power source adapted for placement outside the animal and having transmitter antenna and a transmitter that generates the radio frequency signal which is applied to the transmitter antenna.
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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.
67 Citations
10 Claims
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1. A medical device comprising:
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an antenna having a first coil adapted for engaging a wall of a first blood vessel of an animal to receive a radio frequency signal, wherein the first coil has a first end and a second end, and includes a first winding wound helically in a rotational direction along a longitudinal axis from a first terminus at the first end to the second end, and a second winding connected to the a first winding in a U-shaped section at the second end and wound helically in the rotational direction along the longitudinal axis from the second end to a second terminus at the first end; a detector connected to the first coil for converting the radio frequency signal into a direct current; an electrical storage device connected to the detector for storing electrical energy; a plurality of electrodes adapted to contact with at least one blood vessel of the animal; a stimulation control circuit which determines when stimulation of tissue of the animal is needed; a pulse circuit which responds to the stimulation control circuit by applying voltage from the electrical storage device across the plurality of electrodes; and a power source adapted for placement outside the animal and having transmitter antenna and a transmitter that generates the radio frequency signal which is applied to the transmitter antenna. - View Dependent Claims (2, 3, 4)
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5. A medical device comprising:
- an antenna assembly having a first coil adapted for engaging a wall of a first blood vessel of an animal to receive a radio frequency signal, wherein the first coil has a first end and a second end, and includes a first winding wound helically in a rotational direction along a longitudinal axis from a first terminus at the first end to the second end, and a second winding connected to the a first winding in a U-shaped section at the second end and wound helically in the rotational direction along the longitudinal axis from the second end to a second terminus at the first end;
an electronic circuit adapted to be implanted in the animal remotely from the first blood vessel and connected to the antenna assembly to receive an electrical signal therefrom, wherein the electronic circuit comprises; (a) a detector connected to the first coil for converting radio frequency signal into a direct current; (b) an electrical storage device connected to the detector for storing electrical energy; (c) a plurality of electrodes adapted to contact with at least one blood vessel of the animal; (d) a stimulation control circuit which determines when stimulation of tissue of the animal is needed; and (e) a pulse circuit which responds to the stimulation control circuit by applying voltage from the electrical storage device across the plurality of electrodes; and a power source adapted for placement outside the animal and having transmitter antenna and a transmitter that generates a radio frequency signal which is applied to the transmitter antenna. - View Dependent Claims (6, 7, 8, 9, 10)
- an antenna assembly having a first coil adapted for engaging a wall of a first blood vessel of an animal to receive a radio frequency signal, wherein the first coil has a first end and a second end, and includes a first winding wound helically in a rotational direction along a longitudinal axis from a first terminus at the first end to the second end, and a second winding connected to the a first winding in a U-shaped section at the second end and wound helically in the rotational direction along the longitudinal axis from the second end to a second terminus at the first end;
Specification