Factors affecting the extrusion rates of ventilation tubes.

@article{Mackenzie1984FactorsAT,
  title={Factors affecting the extrusion rates of ventilation tubes.},
  author={Ian J. Mackenzie},
  journal={Journal of the Royal Society of Medicine},
  year={1984},
  volume={77 9},
  pages={
          751-3
        }
}
A survey in which 939 ventilation tubes of 8 different patterns were inserted and reviewed (up to a maximum of 2 1/4 years) is analysed. Various factors determining the rate of extrusion are discussed. The Sheehy Collar Button tube remained functional for a longer period than any of the other tubes included in the survey. 

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