Method and apparatus for determining when a partially or completely collapsed lung has been opened

摘要

A method and an apparatus for determining when a partially or completely collapsed lung has been opened are based on the fact that in the course of opening an alveolus by supplying a gas pressure, the alveolus will generate a crackle sound. By listening to the crackle sounds via microphones, an apparatus can determine when the lung is completely open. The apparatus has a filter for filtering out the relevant frequencies for the crackle sounds and a determination unit for identifying the crackles and for determining when the lung is open based on the filtered out sounds.