摘要 |
Determining the placement of an endotracheal tube in a patient. The invention evaluates discontinuities in the medium surrounding the endotracheal tube, such as airway, as a function of distance past an end of the endotracheal tube. Using a loudspeaker to generate sound waves, the sound waves propagate through a coiled wavetube, a connecting adapter, and an endotracheal tube, into the are of interest. With a processing system, reflected sound waves which return from the cavity back to a microphone within the wavetube are analyzed and an area-distance curve of the area in interest is constructed. |