| 摘要 |
The invention relates to an apparatus for the regulation of a gas volume delivered to a patient during a respiratory cycle, said apparatus including at least one valve (9 or 8) for discharging some of the propellant gas flown from a propellant gas source (4) into a propellant gas chamber (18) and said propellant gas chamber (18) being at least partially defined by a wall (17), having a second chamber (19) on the other side thereof and the location of said wall changing as the propellant gas pressure increases in the propellant gas chamber, thus increasing the volume of the propellant gas chamber, the volume of second chamber (19) on the other side of wall (17) diminishing, thus forcing the gas being delivered to a patient to flow towards a patient (21) and whereafter, in order to perform the exhalation of a patient, the propellant gas chamber pressure is allowed to discharge through valve (9 or 8), whereby the volume of propellant gas chamber (18) diminishes and the volume of second chamber (19) increases as a result of the displacement of wall (17). Between propellant gas chamber (18) and propellant gas source (4) is a pressure regulating element (6), capable of regulating the pressure of a propellant gas flowing from the propellant gas source. The invention relates also to a method for the regulation of a propellant gas flow to be delivered into a propellant gas chamber (18) and supplied from a propellant gas source (4). In abstract, reference is made to fig. 1 <IMAGE> |
