Patent ID: 6902532
Filing Date: 2005-06-07
Classification: A61B

Abstract:
1. A plethysmograph for transmitting reduced-noise pulmonary data from small animals to a differential pressure transducer comprising: a) a test chamber for enclosing a small animal having a first pneumotach with an airflow opening and a first transducer port; b) a reference chamber having a second pneumotach with an airflow opening and a second transducer port, said first and second transducer ports being adapted to communicate with said differential pressure transducer; and c) a manifold in communication with said first and second airflow openings, said manifold having an exterior airflow opening, and a passageway connecting said exterior airflow opening to said first and second airflow openings, whereby air entering both pneumotachs enters through said exterior airflow opening, thereby reducing noise in said transmitted data.