Needleless connectors: a primer on terminology.

Within the past 20 years there has been an explosion of devices designed to allow connection of multiple intravenous sets and catheter hubs without the use of needles. Currently, the number of devices, their internal and external designs, and their functions can be quite confusing. There is a lack of clear definitions and terminology universally accepted by all professionals involved, leading to additional confusion. The purpose of this article is to provide an overview of the many types of technological designs, clarify the characteristics, and recommend clear and concise definitions.