Apparatus for determining and recording injection doses in syringes using electrical capacitance measurements
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United States of America Patent
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Feb 24, 1998
Grant Date -
N/A
app pub date -
Jul 22, 1996
filing date -
Jul 22, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus for electrically determining and recording the dose of an agent delivered with a syringe of the type having a barrel for holding the agent and a plunger for expelling the agent. The syringe includes a capacitive element having first and second conducting surfaces arranged such that the capacitance of the capacitive element varies in dependence upon the dose of agent contained in the barrel. An input terminal and an output terminal located on the outside of the syringe are electrically connected to the first and second conducting surfaces, respectively. The apparatus produces a voltage difference across the terminals, thereby charging the capacitive element. A capacitance meter measures the capacitance and a microprocessor calculates the dose from the measured capacitance. The calculated dose is recorded by a digital memory unit.
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