The 7200 is pneumatically driven, electronically (microprocessor) and pneumatically controlled with CMV, SIMV, and CPAP available in volume controlled or pressure controlled modes. Volume control is more correctly called flow control, and as such, is therefore time-cycled rather than volume cycled. Pressure control is time cycled. Pressure support and flow-by are available options as are many other functions accessible via the [++] key. Pressure support is pressure or flow triggered and flow cycled when the flow falls to 5 LPM.

The 7200's control panel is divided into 3 sections: Patient Data shown in green above, Ventilator Settings shown in blue, and Ventilator Status shown in black. The same panel is illustrated on the right. Each section will be enlarged and discussed starting with the the center section.

The keypad is used to input values for the ventilator and alarm settings. Each ventilator setting has its own separate display window to show the current setting for Tidal Volume, Rate, Oxygen %, and Peak Flow.
To change any of the 6 ventilator settings or 6 ventilator alarms, press the desired parameter pad. The value is displayed in the long message display window (MDW) in the middle of the section. The new value is entered on the keypad and the <ENTER> pad is pressed.To change modes or flow waveforms or activate manual breath or manual sigh, simply press the desired pad. Before a manual sigh can be given, however, sigh parameters must be set using the Automatic Sigh pad, whether Automatic Sigh is
ON or not. Accessing functions using the [++] key usually requires pressing the <ENTER> pad until <UPDATE PARAMETERS> is viewed in the MDW. The last <ENTER> actually implements the change. The [CLEAR] pad makes the MDW blank to correct mistakes made while using the keypad. [CLEAR] will also change various functions accessed through the [++] key.

Activating the [100% SUCTION] pad will deliver 100% oxygen for 2 minutes. The [NEBULIZER] pad will deliver 10 LPM during inspiration to the nebulizer port as long as the peak flow is over 10 LPM. The nebulizer will automatically end after 30 minutes. Nebulization will occur during any type of breath as long as the flow is 10 LPM or more. The nebulizer FIO2 will be AIR if the ventilator FIO2 is less than 0.60. It will use 100% oxygen if the FIO2 is 0.60 or more. The 6 ventilator alarms are functional in all modes. When switching from CMV to SIMV, the LOW TIDAL VOLUME and LOW MINUTE VOLUME alarms monitor all breaths which include spontaneous in SIMV, so the alarm settings might require adjustment when changing modes. PEEP/CPAP is set with the control knob located in the top of the section.

The Patient Data section (green) has the Airway Pressure monitor, and a display window for PEAK, PLATEAU, PEEP, and MEAN AIRWAY pressur, depending on which pressure pad indicator is illuminated. Set the PEEP/CPAP level according to the AIRWAY PRESSURE monitor and not the LED PEEP/CPAP display. There is also a display window for RATE or I:E RATIO. At the bottom of the section, exhaled TIDAL VOLUME, MINUTE VOLUME, or SPONTANEOUS MINUTE VOLUME can be displayed in liters.

In the Ventilator Status Section, the indicators illuminate together with an audible warning when any of the alarm conditions have been met. In addition to the 6 alarms in the Ventilator Settings section, there are built-in alarms which include Low Battery, Exhalation Valve Leak, I:E Ratio, Low Air, and Low O2. The 7200 stores the last ventilator settings in memory, which are used on initial power up, and requires battery power for the Vent Inop alarm. Low Battery indicates that battery power is too low to sustain one hour of memory. The Exhalation Valve Leak alarms when 10% of the delivered volume or 50 mL pass through the expiratory flow transducer during inspiration. The Apnea indicator illuminates when there has been no breath sensed at the expiratory flow transducer for the length of time determined by the Apnea Interval setting (Function 1 in volume control and Function 81 in pressure control).

In the bottom half of the Ventilator Status section, the Alarm Summary Display has three indicator lights. When an alarm condition occurs, the red indicator illuminates, an audible alarm sounds, the specific alarm indicator above flashes, and the alarm condition is identified in the MDW. If the condition corrects itself, the indicator changes from red to yellow, the audible stops, and the specific alarm indicator stops flashing and shines continuously. When the alarm condition has been RESET, the indicator changes to blue for NORMAL function.

The BACKUP VENTILATION indicator illuminates when 3 system errors have been detected in a 24 hour period. The ventilator must be changed out immediately. SAFETY VALVE OPEN illuminates during the initial power up when the Power-On-Self-Test is running. Alarm Silence will stop the audible alarm for 2 minutes, after which time the audible will resume if the alarm condition is not corrected.

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