Systems and methods for flushing an assessment catheter

A method for assessment of a lung compartment comprising the steps of:

• providing a pulmonary diagnostic system comprising:
• a pulmonary catheter, said catheter having a proximal end and a distal end with a lumen disposed in-between;
• a flushing unit, said flushing unit comprising a fixed volume gas chamber configured to store a volume of a clearing gas and a gas restrictive element configured to regulate delivery of the clearing gas from the gas chamber;
• and
• at least one measuring component connected with the catheter;
• introducing the distal end of the catheter to a compartment of a lung;
• generating measurement data characterizing the compartment of the lung with the pulmonary diagnostic system;
• and
• changing a state of the gas restrictive element, thereby delivering the clearing gas from the flushing unit to the lumen and out the distal end to flush secretions or debris from the lumen while the distal end is within the compartment of a lung, wherein the state of the gas restrictive element is changed such that the clearing gas stored in the gas chamber is instantaneously released to flush the catheter.