A-A-54444
A sigh circuit shall be included, which when activated, shall provide a ventilator breath equivalent to 150 percent of the inspiratory time setting (truncated to a maximum of 3 seconds) once every 7 minutes or 100 breaths, whichever occurs first.
The synchronized intermittent mandatory ventilation modes shall include an adjustable trigger level sensitivity to activate ventilator controlled breaths. The trigger level sensitivity range shall be adjustable to at least minus 8 cmH2O. Trigger level sensitivities shall not be absolute values but values relative to positive end expiratory pressure (PEEP).
The ventilator shall have a manual trigger circuit. When its activating switch is depressed, the manual trigger shall permit a continuous flow of gas (at the flow control setting) until released. The manual trigger shall be operable during normal ventilator operation and in the event of microprocessor (CPU) failure. When the manual trigger is released the ventilator shall resynchronize for automatic operation by initiating one exhalation period before resuming timed breaths.
The unit shall have controls and indicators functionally grouped to facilitate operator usage.
A digital bar graph shall be included consisting of at least 20 distinct bars. The bar graph shall provide a means by which to continuously display airway pressure. The range of this graph shall be at least minus 10 to plus 100 cmH2O.
The ventilator shall have a digital readout, consisting of at least 3 digits. This readout will furnish numeric data pertinent to airway conditions, control settings, alarms and calibration. The digital readout shall become activated whenever airway pressure, peak airway pressure, mean airway pressure and PEEP pressure display switches are depressed. It shall activate whenever the ventilator rate, inspiratory time, low airway pressure settings are adjusted or their respective display switches are depressed. The digital readout shall also activate at “power up” displaying the current settings for ventilator rate, inspiratory time, low and high pressure alarms. It shall activate to warn of CPU failure, an operator attempt to set inverse I:E ration (inspiratory time greater than expiratory time), and detection of incorrect
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