Apparatus for electrically determining injection doses in syringes
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United States of America Patent
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Oct 29, 1996
Grant Date -
N/A
app pub date -
Jul 22, 1994
filing date -
Jul 22, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An apparatus for electrically determining and recording the dose of an agent delivered with a syringe consisting of a barrel for holding the agent and a plunger for expelling the agent. The syringe has a conducting path with an input terminal and an output terminal, and at least one electrically resistive element, whose resistance changes depending on the position of the plunger inside the barrel. The apparatus produces a voltage difference across the terminals and causes an electric current to flow through the conducting path. An electric response measuring device, preferably an ammeter, measures the electric current delivered from the syringe's output terminal and calculates the dose therefrom. The result is recorded by a digital memory unit.
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