Patent ID: 8399823

Claim:
An electrical sensor system implemented with a movement mechanism for operating a syringe, said system detects the presence of a plunger of said syringe, said system comprising: [a] at least two parallel disposed rods, said parallel disposed rods and are characterized by at least electrically conductive surface, and [b] a plunger associated unit, accommodating said plunger of said syringe, said plunger associated unit comprising at least: [1] a fastener, accommodating a thumb-rest plate of said plunger; [2] at least two flanking apertures and, respectively accommodating said at least two parallel disposed rods; [3] a pushably activated cutoff switch, said cutoff switch is activated/deactivated by said fastener; [4] at least two probes, said probes are electrically coupled to the respective electric terminals of said cutoff switch; wherein said plunger associated unit is slidably translatable along said at least two parallel disposed rods; wherein said at least two probes dynamically form an electrical contact with said electrically conductive surface of said rods, wherein said contact is maintained during a contiguous sliding of the former along said electrically conductive surface of the latter; wherein upon introduction of said thumb-rest plate of said plunger in-between said plunger associated unit and said fastener, said cutoff switch is activated/deactivated; whereas upon removal of said thumb-rest plate of said plunger, said cutoff switch is respectively deactivated/activated; wherein an interruptible electrical circuit is formed between said rods, whereby allowing continuously detecting the presence of said plunger in said plunger associated unit during said slidable translation of the latter along said electrically conductive surface of the former.