Impedance sensor
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United States of America Patent
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Jan 12, 2010
Grant Date -
May 1, 2003
app pub date -
Oct 21, 2002
filing date -
Oct 26, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A transdermal transport device includes a reservoir for holding a formulation of an active principle, a needle with a bore through which the formulation is transported between the reservoir and a target area of a biological body, and an impedance sensor. The impedance sensor has an electrode positioned to measure the impedance of a portion of the target area between the needle and the electrode to indicate the depth of penetration of the needle into the target area.
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