Method and apparatus for performing a forced expiratory...

Surgery: kinesitherapy – Kinesitherapy – Exercising appliance

Reexamination Certificate

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C128S200240, C600S532000, C600S538000

Reexamination Certificate

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07108666

ABSTRACT:
Disclosed is a method and device for performing forced expiratory maneuver in an infant to assess the infant's pulmonary function. Under this method, the infant's lungs are synchronously inflated to super-atmospheric levels synchronous with the infant's natural tidal inspiration for a plurality of consecutive respiratory cycles. The end-expiratory CO2levels in the infant's respiration are measured during the test. When the end-expiratory CO2concentration decreases from the baseline by a pre-defined amount, the infant lungs are rapidly inflated to substantially total lung volume and rapidly deflated to produce a maximum forced expiration. The pre-defined amount of change in CO2concentration is usually determined by the testing clinician. Typical concentration drop in CO2levels, for example, ranges between 4 and 8 mmHg. But the decrease may also be as little as 2 mmHg or as much as 15 mmHg, depending on the testing clinician. The decrease in the end-expiratory CO2level of the infant indicates that the infant's respiratory center is sufficiently modified to allow for the measurement.

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