while simultaneously blocking fluid flow from or to the fluid container application_number US 86408404 A description fig1 shows a veterinary syringe 1 in a sectional representation the syringe 1 comprises a handle 2 having applied thereto a lever by which the syringe can be actuated actuation of the lever acts on a plunger 3 which is attached to a plunger rod 4 and moves inside a barrel 5 the syringe further comprises a port 6 onto which a syringe needle may be fitted a port 6 is screwed onto a syringe head 7 by means of an intermediate ring on an opposite side a barrel 5 is screwed into the head using a suitable gasket further a supply duct 8 from a fluid container not shown in fig1 which is connected to a fluid container port of the syringe head 7 terminates in the syringe head 7 via a valve mechanism without a reference numeral in fig1 which will be explained later a position sensing device 9 which is electrically connected via a signal cable and cooperates with a magnet 11 provided at the end of the handle 2 into which the syringe barrel is inserted in order to detect whether the plunger 3 is.