Method and breathing apparatus for assessing pulmonary stress

Surgery – Diagnostic testing – Respiratory

Reexamination Certificate

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C600S533000, C600S538000

Reexamination Certificate

active

07322937

ABSTRACT:
In a method and breathing apparatus for assessing pulmonary stress, wherein pressure controlled flow of respiratory gas is generated, an ensuing flow is measured, resistance and compliance are determined based on measured pressure and flow and a stress index value is determined based on pressure, flow, resistance and compliance. The stress index value is 1 when no stress is present, ≧1 when there is a risk for overdistension and ≦1 when alveolar units are at a risk of being cyclically closed and opened. Implemented in a breathing apparatus the method can be used to assist an operator in diagnostic and therapeutic considerations in relation to a patient.

REFERENCES:
patent: 5316009 (1994-05-01), Yamada
patent: 5876352 (1999-03-01), Weismann
patent: 6257234 (2001-07-01), Sun
patent: 6435182 (2002-08-01), Lutchen et al.
patent: 2002/0110849 (2002-08-01), Leonhardt et al.
patent: 0 521 515 (1993-01-01), None
patent: 1 108 391 (2001-06-01), None
patent: WO 01/26721 (2001-04-01), None
Patent Abstracts of Japan Publication No. 2000175886, for Japanese Application No. 10354751.

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