Abstract: An apparatus for controlling the rate of dripping of an intravenous fluid, comprising (i) a drip-detecting device for detecting that an intravenous fluid has dripped into a drip-feed bottle, (ii) a clock for measuring time and indicating the current time, (iii) a constricting arrangement connected to a fluid-supply pipe extending from the drip-feed bottle in a downstream direction, for constricting the supply tube, and (iv) a flow controller for controlling the amount of constriction of the supply pipe by the constricting arrangement, based on a signal from the drip-detecting device indicating detection of a drip and a time signal from the clock. The apparatus enables one to accurately control the interval of time at which an intravenous fluid drips into the drip-feed bottle and, hence, to administer the fluid to a patient at a desired rate.

Abstract: Device for heating transfusion fluids, such as blood and drugs in solution, prior to their intravenous drop-by-drop introduction to patients, which comprises a case having therein a heater and an electric circuit, a heating plate disposed in a front face of the case and having, on its surface, a groove following a winding course at its middle portion and adapted to receive therein a transfusion fluid conduit, and a lid for closing said case on the side of its front face. The heater is connected to the back side of the heating plate, so as to heat the heating plate. The electric circuit includes a fluid-temperature thermistor, a heater-temperature thermistor, and a heating-plate temperature thermistor. Electric input to the heater is controlled on the basis of the temperature determined by the fluid-temperature thermistor, so that the fluid through the conduit may have its predetermined temperature.

Abstract: A device for heating an infusion liquid to be injected into a human body includes a casing having an open top and a closed bottom, with a liquid inlet section and a liquid outlet section, providing a compartment receiving a heating bag providing flow passage for the liquid to be heated. Two heating plates are mounted on the casing bottom and three thermosensors are provided; the first at the inlet section, the second between the heating plates and the third at the outlet section. A cover closing the open top is provided with a push plate holding the bag against the heating plates. A control circuit controls the first heating plate in response to the temperature in the vicinity of the bag inlet and the middle of the bag as detected by the first and second thermosensors and the second heating plate in accordance with the temperature in the vicinity of the bag outlet as detected by the third thermosensor. The control circuit is also responsive to a flow rate detector.