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Double helical antenna assembly for a wireless intravascular medical device

  • US 7,295,879 B2
  • Filed: 06/24/2005
  • Issued: 11/13/2007
  • Est. Priority Date: 06/24/2005
  • Status: Expired due to Fees
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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