Importance

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Abstract

The invention presents a syringe for injecting a dose of an agent and for electrically indicating the size of the dose. The syringe has a barrel for holding the dose and a plunger for expelling the dose from the barrel. The barrel has a conducting rim that contacts a surface of the plunger lined with electrical contact points. The position of the plunger inside the barrel determines which one of the contact points contacts the conducting rim. Each contact point is electrically connected to a different output terminal located on the syringe cap. The conducting rim is electrically connected to a voltage input terminal located on the syringe cap. A voltage applied to the input terminal causes an electric current to flow through a circuit comprising the conducting rim, the one contact point contacting the conducting rim, and the one output terminal connected to that one contact point. The position of the plunger inside the barrel and the size of the dose corresponding to that plunger position are indicated by the one output terminal having the electric current.

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First Claim