Intravenous infusions and one-way valves.

@article{Crosby1991IntravenousIA,
  title={Intravenous infusions and one-way valves.},
  author={Edward G. Crosby},
  journal={Canadian journal of anaesthesia = Journal canadien d'anesthesie},
  year={1991},
  volume={38 6},
  pages={799-800}
}