[A simple system for recording and/or infusion-withdrawal in animals without restriction of movements]

A low cost system was designed to allow a normally active animal to be monitored unrestrained in experiments using indwelling catheters and electrode leads. It is composed of a motor-rotated plate, an animal-activated switch and a power source. This system automatically compensates the horizontal, vertical and rotative animal movements and prevents twisting or kinking of the catheters and leads.