Continuous or drip infusion has been used extensively in adults. Its application to the needs of infants has been discouraged by the technical difficulties encountered. The aim is to give fluid intravenously over a period of days at a minimum rate of 240 cc. in twenty-four hours to an infant weighing 4 pounds (1.8 Kg.) or over. To do this, one must solve four cardinal problems: (1) control of the flow of fluid at a rate of 10 cc. per hour or faster; (2) regulation of the temperature of the fluid; (3) a stable connection with the patient's vein, and (4) prevention of back-flow on an increase of venous pressure.
The apparatus to be described answers all these difficulties in a new and simple manner. It requires no supervision or adjustments. Its parts are fool-proof and stable.
SOLUTION OF DIFFICULTIES
Control of Flow.—Various devices have been used. The commonest