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Mechanically Simple Infusion Pump

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

The pumping mechanism described in this note was designed specifically for continuous intravenous infusion of aqueous solutions into lactating cows. The simplicity, inexpensiveness, and adaptability of this pump has prompted a brief description of its construction (Figure 1). It employs a 1-rpm continuous duty Bodine electric motor as a power source. This motor operates from 115 v A.C. source, has an input of 7.5 w, and is capable of producing a torque of 110 in. oz. A solid steel cam, 1 cm thick, 3 cm in diameter, and centered to give a 1.3-cm stroke was placed on the drive shaft of the motor. The motor was then placed in a slotted 12-in. piece of 2 by 4 in. lumber.

A 10-ml syringe equipped with a springloaded plunger wTas mounted on a horizontal plane with the rotating cam. A two-way Luer-Lok valve was then attached to the syringe, allowing it to be filled and emptied with each rotation of the cam.