| 摘要 |
<p>Apparatus comprises a ventilator 1, an uncuffed endo-tracheal tube for delivering gas to the lungs of a patient, a first flow sensor 5 sensing gas flow to a patient upon inspiration and generating a signal representative of the sensed inspiration flow, a pressure sensor 4 for sensing the pressure of gas flowing to a patient upon inspiration and generating a signal representative of the sensed inspiration pressure, a second flow sensor 6 for sensing gas flow from a patient upon expiration and generating a signal representative of the sensed expiration flow, and a controller 8, the controller 8 receiving output signals from the said flow and pressure sensors and processing those signals according to a computer program, and the computer program deriving from the said flow and pressure signals a value for leak resistance. The value for leak resistance may be used to display a value for the quality of fit of the tracheal tube. The computer program may use an algorithm to calculate leak resistance.</p> |
