| 摘要 |
<p>The respiratory resistance gauge has a tube, one end of which is applied to the patient's mouth, and the other end of which has a variable aperture. At a point on the tube corresponding to about halfway between the free end and the patient's lungs, there is a branch tube containing air pump which delivers 50cc at 4Hz. Symmetrically, spanning both sides of the pump branch, are the two branches that serve a manometer. The manometer delivers an electrical signal to a pair of integrators in tandem, which smooth out the fluctuations due to the pump and to the patient's breathing. The variable aperture at the end of the tube is adjusted (automatically) until the manometer gives zero output. Then the pump is affecting both ends of the tube equally so that the size of the aperture then gives a measure of the resistance to the patient's breathing passage.</p> |
