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With occasional exceptions in which knowledge is sought for its own sake, the ultimate purpose of research is the practical application of the principles investigated. The clinical use of research apparatus is often limited, however, by cost and highly specialized design. An inexpensive and simple means for connecting polyethylene tubing between 1.22 and 1.7 mm. (0.048 to 0.067 in.) in outside diameter to Luer-hub needles of any gage was developed in connection with investigations of cerebral hemodynamics. It was subsequently pointed out that the method would have definite clinical value, particularly in pediatrics, in situations in which such connections now require specially constructed needle hubs that often have numerous parts or relatively expensive, bulky, heavy adapters.
Only two parts are needed to connect polyethylene catheters in the sizes mentioned to Luer-hub needles; an ordinary Luer-slip adapter (subsequently referred to as an impactor) from a 30 or 50 cc. syringe
Alman RW, Whoriskey FG. SIMPLE COUPLING DEVICE FOR POLYETHYLENE CATHETER. JAMA. 1953;153(6):562–563. doi:10.1001/jama.1953.02940230034006j