| 摘要 |
PCT No. PCT/SE91/00099 Sec. 371 Date Oct. 11, 1991 Sec. 102(e) Date Oct. 11, 1991 PCT Filed Feb. 13, 1991 PCT Pub. No. WO91/12051 PCT Pub. Date Aug. 22, 1991.An acoustic respiration detector includes at least two tubular air transmission lines having ends which are connected to microphone elements. Close to the other ends of the lines are openings at which turbulence, and hence acoustic signals, are created by the incidence of airflow caused by respiration. A holding element secures the openings relative to the mouth or nose of a patient whose respiratory function is to be monitored, and a flow directing element, for example formed like a face mask, directs the airflow to the openings. The microphone elements are connected in a bridge circuit with two voltage supplying leads and at least one signal lead. Thereby the sensitivity to mechanical and acoustic disturbances is suppressed. |
