| 摘要 |
An artificial ventilator includes a dome (1) for covering the precordial and the sides of the thoraco-abdominal of a patient, a blower (4) to be used for applying negative and positive pressures within the dome, a regulator (13, 17) for adjusting a pressure, and the like. The valve switching device (55) is controlled by a respiration detection system. In the respiration detection system, a pyroelectric element (41) is used as a respiratory sensor (51) for detecting a temperature change rate caused by an inspired and expired air flow. The temperature change rate signal obtained by the sensor is compared (53) with a threshold value set by a variable resistor, the start timings of expired air and inspired air are detected in accordance with the comparison result, and air inspiration and expiration start timing signals are outputted. Further, the artificial ventilator can be provided with various functions of forced respiration and intermittent deep breathing by means of a timer, synchronization only with air inspiration timings, reduction of frequency of respiration assistance for the intention not to use the ventilator in the near future, backup during apnea, and the like. |
