Patent ID: 6948636

Claim:
A device for administering liquids, the device comprising a lower casing half; an upper casing half pivotally connected with the lower casing half; a closure holding together the casing halves in a closed condition for the formation of a casing; a pressure piston in the casing for applying pressure to a bag between the lower casing half and the pressure piston and filled with the liquid to be administered; and a mechanism having a rocking lever having an upper end bearing on the upper casing half and a lower end on which the piston is pivoted, and a tension spring and flexible element connected between the casing halves and the upper end of the rocking lever and angularly biasing the lever for movement from a generally horizontal position extending generally horizontally with the piston raised and a tilted position with the piston lowered for applying such a force to the pressure piston, when the casing is closed and the bag is laid in, that a pressure is generated in the bag which causes the discharge of a constant liquid volume per unit of time over the period of time of the administering process.