respiratory insertion body that is in communication with the third opening to a third fluid line;
operating the controller to automatically, at a predetermined time period, apply suction through each of the first, second and third fluid lines, and automatically turn off suction in one or the first, second or third fluid lines when fluid flow through one of the fluid lines falls below a flow threshold and when pressure in that fluid line is above a pressure threshold, and applying positive pressure in that fluid line to clear a blockage when fluid flow through that fluid line falls below the flow threshold and when pressure is below the pressure threshold;
operating the controller to automatically and periodically applying a lavage liquid from the first opening into the oral cavity;
collecting fluid from each of the first, second and third fluid lines into one or more collection containers; and
displaying properties of fluid in the fluid lines on a display, wherein the one or more properties comprises: flow rate of a secretion within the fluid line, thickness of secretion within the fluid line, volume of secretion within the fluid line, or color of the secretion within the fluid line.
45. The method of claim 44, further comprising inputting user-selected control information into the controller, the user-selected control information comprising one or more of; lavage delivery frequency, lavage duration, lavage pressure, suction application frequency, suction duration, and suction pressure.
46. The method of claims 4445, wherein applying positive pressure in that fluid Mne to clear a blockage comprises applying suction from the first second and third openings applying positive pressure in that fluid line.
47. The method of claims 44-45, wherein applying positive pressure in that fluid tine comprises delivering lavage fluid through the fluid line.
48. The method of claims 44-47, wherein inserting a respiratory insertion body having a plurality of openings into the subject's respiratory tract comprises inserting an endotracheal tube comprising the respiratory insertion body into subject's respiratory tract.
49. The method of claim 4447, wherein inserting a respiratory insertion body having a plurality of openings into the subject's respiratory tract comprises coupling the respiratory insertion body onto an endotracheal tube already in the subject's respiratory tract

50. The method of claims 44-49, further comprising coupling the respiratory insertion body onto an endotracheal tube.