Active Implantable Medical Device Integrating Spirometric Means for Diagnosing Lung Diseases
First Claim
1. An active implantable medical device, comprising:
- means for collecting a transthoracic impedance signal representing instantaneous lung volume variations from a patient; and
spirometric means for producing, from the transthoracic impedance signal received over at least one respiratory cycle, data pairs comprisinga lung volume (V), anda pulmonary flow (dV/dt), represented by the derivative of said lung volume, wherein said data pairs represent a spirometric characteristic (S) corresponding to the pulmonary flow (dV/dt) relative to the lung volume.
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Abstract
An active implantable medical device, integrating a spirometric function for the diagnosis of lung diseases is disclosed. The active implantable medical device measures the respiratory activity of a patient to collect a transthoracic impedance signal according to changes in lung volume. The active implantable medical device comprises a spirometer function produces, from the transthoracic impedance signal collected over a respiratory cycle, a characteristic curve that couples of flow values (dV/dt) as a function of pulmonary volume (V) that represents a spirometric characteristic (S) of a patient. An spirometric analysis is performed to deduce from the spirometric characteristic (S) at least one parameter of the patient'"'"'s pulmonary status and to produce a diagnostic indicator based on the comparison of the at least one parameter with a predetermined reference value.
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Citations
15 Claims
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1. An active implantable medical device, comprising:
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means for collecting a transthoracic impedance signal representing instantaneous lung volume variations from a patient; and spirometric means for producing, from the transthoracic impedance signal received over at least one respiratory cycle, data pairs comprising a lung volume (V), and a pulmonary flow (dV/dt), represented by the derivative of said lung volume, wherein said data pairs represent a spirometric characteristic (S) corresponding to the pulmonary flow (dV/dt) relative to the lung volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification