| 摘要 |
<p>There is decribed a non-invasive device designed to assist expectoration of pulmonary secretions in humans, particularly in those whose natural exhalation and natural coughing ability are impaired. The device has a quick-acting valve (12), a pressure sensing means (18) generating a signal indicative of a pressure in the upper part of the subject's respiratory tract, detecting means indicating the imminent collapse of the subject's respiratory tract or a part thereof, and control means (30) opening or closing the valve (12) respectively in response to the signals from the sensing means (18) and the detecting means so as to create supramaximal flows in the respiratory tract in order to stimulate the movement of secretions towards the mouth of the subject. The valve (12) opening/closing sequence is totally subject-controlled.</p> |
