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Surgical implement detector

  • US 7,420,468 B2
  • Filed: 12/09/2005
  • Issued: 09/02/2008
  • Est. Priority Date: 02/10/2005
  • Status: Active Grant
First Claim
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1. A detector system for detecting an RFID tag having an RF antenna and being configured to transmit therefrom a signal containing a modulated carrier frequency impressed with an identification code, the detector system comprising:

  • a presence detector having an interrogating antenna configured to transmit a carrier frequency; and

    wherein;

    the RF and interrogating antennae are coupleable to one another within a presence range;

    the RFID tag being configured to transmit a signal in response to the carrier frequency received from the interrogating antenna;

    the interrogating antenna being configured to receive a signal from at least one of the following;

    the signal transmitted by the RFID tag, signals transmitted by a combination of environmental noise and the RFID tag;

    the presence detector further including;

    a signal reader configured to receive the modulated carrier frequency from the RFID tag during a predetermined response time period for comparison to a reference level for determining the presence of the RFID tag within the presence range.

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