ENGINEERING PERFORMANCE EVALUATION OF ARMY VOLUME-CYCLED RESPIRATOR, MODEL 3
HARRY DIAMOND LABS ADELPHI MD ADELPHI
Pagination or Media Count:
The Army volume-cycled respirator, which has pressure-cycling capabilities, can assist or control the ventilation of patients. The Model 3 respirator was designed to reduce the internal compliance that caused undesirable performance in the Model 2 unit. Engineering tests using simulated lung compliances and airway resistances show that internal compliance has been reduced from about 0.010 lcm H2O in Model 2 to about 0.002 lcm H2O in Model 3. Consequently, the variation in delivered tidal volumes due to changes in simulated patient compliance and resistance is much less in Model 3 than in earlier models. The complete engineering performance of the Model 3 respirator, including inspiratory times, expiratory times, cycling rates, delivered tidal volumes, minute volumes, and mask pressures, are presented. Generally the results show that this respirator has a wide range of performance and is capable of giving adequate ventilation for all test conditions studied.