The invention relates to a portable automatic dosimeter with an accuracy in the range of microliters, actuated by a shape memory wire, allowing certain liquids, including ophthalmic liquids, to be proportioned in drops with volumes in the microliter range. According to the invention, the dosimeter comprises a body () closed at its upper part by a cover () which continues in the lower part with a tube () wherein a piston () can be displaced axially, the tube () and the piston () being component parts of a standardized syringe in which there is initially placed the volume of liquid to be proportioned, the piston () being displaced by a shape memory wire (), made up of an active material which, when supplied with a voltage of 3 V, produced by two batteries () located in the body () of the dosimeter, develops a considerable force and a contraction of 3% of its length, the displacement transmitted from the wire to the piston being carried out by a one-way coupling consisting of a housing () rotated through a threaded pin () in one direction by shape memory wire () and brought to the initial position by a spiral draw spring, both of them being attached in diametrically opposed points to a plate (), a profiled piece () and two cylindrical rolls () rotating an axle () and a linear cam () rigidly fastened on the axle, only in the direction in which each electric supply and contraction of the wire produces the motion of rotation of the housing () in the opposite direction of motion thereof, produced by the spiral spring (), the axle preserves its position the cam (), by means of a bearing (), transmits the rotation motion to a sliding piece () receiving a forward motion taken over by the rod of the piston () whose displacement produces a microproportioning every time when pushing for 1 second an electric button which supplies the shape memory wire ().Invenţia se referă la un dozator automat, portabil, cu precizie microlitică, acţionat cu fir cu memoria formei, care permite d
