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

  • US 6,116,241 A
  • Filed: 07/08/1997
  • Issued: 09/12/2000
  • Est. Priority Date: 07/08/1996
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining when an at least partially collapsed lung of a subject has been opened by gas pressure supplied to the lung from a ventilator comprising:

  • means for obtaining an audio signal from a lung region of a subject, said audio signal including a distinctive component produced by opening of alveoli in the lung;

    filtering means for filtering out said distinctive component; and

    evaluation means supplied with said distinctive component filtered out of said audio signal for determining, from said distinctive component, a degree of opening of the lung.

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