Assembly of an inexpensive rat jugular catheter button based on a split-septum needleless intravenous system

Rat intravenous self-administration is a widely-used animal model in the study of substance use disorders. Rats are tethered to a drug delivery system usually through a port or button that interfaces the drug delivery system with a chronic indwelling jugular vein catheter. These buttons can be purchased commercially but are costly, presenting a significant economic barrier for many researchers. Many researchers manufacture buttons in-house from a combination of individual custom made and commercially available components, resulting in large variation in terms of how the animals are handled and the longevity of catheter patency. We have developed a jugular catheter button that uses a split septum port to provide snap-on entry of a blunt cannula allowing for quick and easy attachment of the i.v. tubing. The port is constructed from commercially available split septum ports, surgical mesh and small metal cannula. The system is “needleless” which decreases the risk of infection and improves safety. The split-septum buttons are easily sterilized in-house adding to the reliability and decreases in the risk of infection. We have used this easily constructed, and inexpensive button for i.v. self-administration experiments in which 80 % of the rats maintained patency for a minimum of 35 days. • Inexpensive method to construct a self-administration backport button. • Utilizes inexpensive components already found in a research laboratory or commercially available. • Can be sterilized in-house without degrading glue or components.