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VENTILATOR AND METHOD
申请公布号：CA1041866(A)
申请号：CA19760258707
申请日期：1976.08.09
申请公布日期：1978.11.07
发明人：BIRD, FORREST M.
分类号：A61M16/00
主分类号：A61M16/00
摘要：Ventilator having an inhalation phase and an exhalation phase in its operative cycle for use with a source of gas under pressure and having an inlet adapted to be connected to the source of gas under pressure. Master control valve means having an inlet and an outlet and a valve member movable between open and closed positions is provided for controlling the flow of gas from the inlet to the outlet. Means is provided which connects the inlet of the control valve means to the inlet of the ventilator. The valve member is in an open position during the inspiratory phase and in a closed position during the expiratory phase of the ventilator. The master control valve means includes a diaphragm which upon movement causes movement of the valve member. The master control valve means includes means forming a chamber on one side of the diaphragm. breathing head assembly is provided. Means is provided for supplying gases from the outlet of the control valve means to the breathing head assembly. Timing means is provided for timing the introduction of gases into and the bleeding of gases from the chamber to thereby control the movement of the valve member to initiate the inspiratory and expiratory phases of the ventilator. Means is provided for monitoring the pressure of the gases in the breathing head assembly. A demand flow accelerator is responsive to the pressure of the gases in the breathing head assembly and provides additional gases to the breathing head assembly when the pressure of the gases in the breathing head assembly falls below a predetermined pressure. Means is also provided responsive to the pressure of the gases in the breathing head assembly when the pressure of the gases in the breathing head assembly falls below a predetermined value to cause the patient to exhale against a substantially constant positive airway pressure. Means is also provided which is sensitive to the airway pressure being sensed for bleeding gases from the breathing circuit when pressures greater than a predetermined pressure are reached. Lockout means is provided for locking out an inspiratory phase which exceeds a predetermined time. Starting means is provided for ensuring that the ventilator will be switched to an expiratory phase before an inspiratory phase is initiated.