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Related Experiment Videos

Modified occlusion tests for the Bain breathing system.

P J Heath1, L F Marks

  • 1Shackleton Department of Anaesthetics, Southampton General Hospital.

Anaesthesia
|March 1, 1991
PubMed
Summary
This summary is machine-generated.

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Undetected inner tube defects in anesthesia breathing systems can increase deadspace. New tests, including a modified backbar pressure-relief valve test and a double occlusion test, effectively detect all tested defects.

Area of Science:

  • Anesthesiology
  • Medical Device Engineering

Background:

  • Defects in the Bain coaxial anaesthetic breathing system's inner tube can lead to increased apparatus deadspace.
  • Existing tests for inner tube defects lack validated efficacy.

Purpose of the Study:

  • To evaluate the effectiveness of current tests in detecting inner tube defects.
  • To identify sensitive and reliable methods for detecting these critical defects.

Main Methods:

  • Induced defects in the inner tube of the Bain coaxial anaesthetic breathing system.
  • Evaluated several existing tests for their ability to detect these defects.
  • Developed and tested a modified backbar pressure-relief valve test and a new double occlusion test.

Main Results:

Related Experiment Videos

  • None of the existing tests were able to detect all induced defects.
  • A modified backbar pressure-relief valve test demonstrated high sensitivity.
  • A new double occlusion test was also sufficiently sensitive to detect all defects.

Conclusions:

  • Current methods are insufficient for detecting all inner tube defects in the Bain coaxial anaesthetic breathing system.
  • The modified backbar pressure-relief valve test and the double occlusion test are effective in detecting all tested inner tube defects.