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Method and apparatus for measuring airway resistance and lung compliance

A technology of airway resistance and lung compliance, applied in diagnostic recording/measurement, application, medical science, etc., can solve problems such as airway stenosis, uneven distribution of bronchial tracheal resistance, and easy outflow

Active Publication Date: 2017-09-26
SPIRO TECH MEDICAL INC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0010] A disadvantage of the method taught by Fairfax et al. is that situations of extreme muscular force associated with forced breathing lead to high intrathoracic pressures and narrowing of the airway, which may even lead to its collapse, compared to normal, quiet breathing, leading to Substantially inhomogeneous distribution of tracheal resistance throughout the bronchi
Accurate measurement of such high flows is a technically challenging problem
In addition to this, detailed analysis of the required peak flow waveform for determining lung parameters such as compliance becomes problematic due to the imposition of a forced exhalation waveform assumed to be produced by the tester

Method used

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  • Method and apparatus for measuring airway resistance and lung compliance
  • Method and apparatus for measuring airway resistance and lung compliance
  • Method and apparatus for measuring airway resistance and lung compliance

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Embodiment Construction

[0039] figure 1One possible embodiment of a breathing apparatus is shown in . The flow meter comprises a breathing tube 1 with a proximal end 2 and a distal end 3 . A shutter 4 is attached to the distal end 3 of the tube. The air flow through the tube and the pressure inside the tube are measured by transducer 5 . The flow meter contains a functional element 6 which produces a differential pressure as a function of the air flow. Such elements may alternatively be, for example, pitot tubes or orifices, or other types of known flow restrictors, such as those used in Fleisch or Lilly pneumatic high pressure gauges.

[0040] The transducer 5 may comprise a sensor 8 for measuring the pressure difference across the functional element 6 and a second sensor 9 for measuring the pressure inside the tube 1 . It is also possible to use only one pressure sensor to measure the pressure caused by the gas flow and pressure in the pipe 1, as will be described below.

[0041] According to...

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Abstract

Measurement of airway resistance and / or lung compliance during non forced exhalation is performed using initial occlusion of exhalation followed by removal of the occlusion or opening of a shutter. The measurement device can use a single sensor to measure both pressure and flow. A pressure monitor can detect that exhalation is improperly forced to signal an error or to reject a pressure and flow measurement from a forced exhalation trial.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application 61 / 900,964, filed November 6, 2013. technical field [0003] The present application relates to medical diagnostic devices, and more particularly to devices for measuring respiratory parameters, such as airway resistance and lung compliance. Background technique [0004] Respiratory parameters are often measured to monitor and diagnose the progression of respiratory disease and to formulate treatment recommendations. Use of data on airway resistance and compliance may assist in identifying conditions and instituting appropriate treatment for individuals exposed to smoke, biological or chemical agents, or with chronic lung disease. [0005] Several techniques are used to measure airway resistance. The technique of forced oscillation measures the total respiratory resistance and requires a high level of expertise of the medical personnel. Body plet...

Claims

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Application Information

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IPC IPC(8): A61B5/087A61B5/08
CPCA61B5/087A61B5/085A61B5/7278A61B5/7282
Inventor 奥列格·格鲁丁维克托·洛帕塔
Owner SPIRO TECH MEDICAL INC
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