Infant respiratory impedance measuring apparatus and methods using forced oscillations
First Claim
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1. A four-element model for use in an infant respiratory impedance measuring system, wherein a mask is placed over an infant'"'"'s face, said model comprising:
- a node;
an impedance connected to said node, wherein said impedance corresponds to the respiratory impedance of an infant and comprises three of said four elements; and
a shunt compliance connected to said node in parallel with said impedance, where the shunt compliance corresponds to characteristics of said mask and comprises a fourth of four elements.
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Abstract
An infant respiratory impedance measuring apparatus and method using forced oscillations is disclosed. In order to account for the effects of the mask, a shunt compliance is placed in parallel with the components representing the impedance of the infant.
43 Citations
11 Claims
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1. A four-element model for use in an infant respiratory impedance measuring system, wherein a mask is placed over an infant'"'"'s face, said model comprising:
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a node; an impedance connected to said node, wherein said impedance corresponds to the respiratory impedance of an infant and comprises three of said four elements; and a shunt compliance connected to said node in parallel with said impedance, where the shunt compliance corresponds to characteristics of said mask and comprises a fourth of four elements. - View Dependent Claims (2)
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3. A respiratory impedance measuring system comprising:
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a mask which is located over the face of a subject; means for measuring a pressure and a flow at an airway opening of said subject; means for dividing said pressure by said flow to determine a respiratory impedance of said subject; and means for analyzing said respiratory impedance using a model comprising; an impedance element corresponding to the respiratory impedance of said subject; and a shunt compliance connected in parallel with said impedance element, where the shunt compliance corresponds to characteristics of said mask. - View Dependent Claims (4)
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5. A method of measuring respiratory impedance comprising:
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placing a mask over a subject'"'"'s face; measuring a pressure and a flow at an airway opening of the subject; dividing said pressure by said flow to determine a respiratory impedance; applying said respiratory impedance to a model comprising; a node; an impedance connected to the node, wherein said impedance corresponds to the respiratory impedance of the subject; and a shunt compliance connected to said node in parallel with said impedance, wherein the shunt compliance corresponds to characteristics of said mask. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification