Surgical implement detector utilizing capacitive coupling
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United States of America Patent
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Feb 23, 1993
Issued Date -
N/A
app pub date -
Mar 25, 1992
filing date -
Nov 16, 1989
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus for detecting a surgical implement in human or animal tissue comprises a battery powdered marker. The marker is secured to the surgical implement and positioned within a surgical wound. A detection means has an antenna disposed in close proximity of the tissue. Means are provided for capacitance coupling of both the marker and the antenna to the tissue. A field generating means generates an electromagnetic field having a predetermined frequency band within the tissue and a signal generating means generates a signal having a predetermined frequency band ranging from about 10 MHz to 1 GHz. The signal generated by the signal generating means causes the field generating means to generate the electromagnetic field providing the marker with signal identity.
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