THE PURITAN BENNETT 840 ACUTE CARE VENTILATOR

APNEA Alarm

An APNEA ALARM occurs when a patient's inspiratory efforts are not detected after a timed apnea period. The ventilator goes into apnea ventilation (AV), and the AV screen is displayed. To resume normal ventilation, the operator presses the RESET button. Normal ventilation will also resume after the patient takes two spontaneous breaths.

SST (short self test)

SST takes 3 minutes and - verifies proper ventilator operation, - checks the patient circuit for leaks, - measures circuit compliance and resistance, and - checks the exhalation filter resistance. The SST should be run when a new circuit or humidifier is added, between patient uses, and at least every 15 days during use. The SST can only be run immediately after the ventilator is turned on.

Self test

Self-tests on the 840 include the power on self-test (POST), extended self-test (EST), and short self-test (SST). For any self-test, the ventilator must be disconnected from the patient; and the Y-connector must be uncapped. The POST runs automatically to check the microprocessor when the ventilator is powered on. The EST is a more extensive test and generally is run by a qualified service technician.

POWER SOURCE

The 840 is both electrically and pneumatically powered. It is electrically powered by a 120-volt AC current. The 840 has an internal backup battery (802 backup power) and is intended for emergency power if AC power is lost or falls below an acceptable minimum. Keeping the ventilator plugged into an AC outlet when not in use charges the backup battery. A green light indicates that the ventilator is operating and the BPS has at least 2 minutes of charge available.

lower screen

The lower screen has five areas: the primary settings, the Sand.Box, the set-up keys, the symbol definition area, and the promptarea. The primary settings appear at the top of this screen and are the current set parameters. They may include the trigger sensitivity, mode, mandatory rate, and volume, depending on the mode being used.

System Controls Lower Keys

The touch keys across the bottom of the GUI, just belO\ the lower touch screen, serve several important function From left to right they are: · Screen lock · Display contrast (brightness) · Alarm volume · Alarm Silence (gives 2 minutes of silence) · Alarm Reset · The ? icon: displays basic operating information · 100% O2/Cal button: gives 2 minutes of 100% oxygen and calibrates the internal oxygen analyzer · Manual Inspiration: Delivers a manually triggered breath based on the current mandatory settings. · Expiratory Pause: Used to estimate the end expiratory pressure and auto-PEEP · Inspiratory Pause: Used to estimate the end inspiratory pressure. Pressing and holding this key pause inspiration for up to 8 seconds. This freezes the pressure-time waveform and shows the value for the plateau pressure (PPL), compliance (C), and resistance (R).

Upper screen

The upper screen holds patient information only and displays four areas: patient data, alarms and ventilator status, miscellaneous data, and graphics (see Figure 12-90). No Ventilator settings can be changed in this area.

Alarms

The ventilator is equipped with the normal alarms, such as high pressure, high and low tidal volume, high rate, prolonged inspiratory time, high and low oxygen percentage, apnea, power loss, and circuit disconnect. When these occur, a description of the alarm condition and possible remedies for the problem appear in the monitored data screen. Operator's manual provides complete description of available alarm

alarm setting set up

To set the alarm limits, the operator selects the alarm screen (ALARM SETUP button, lower screen). A window opens showing bar graphs, which indicate the current set tings of the alarms and the measured value for the parameters (Figure 12-91). To change an alarm setting, the operator presses the desired alarm screen icon. (NOTE: This icon is shaped like a box containing a speaker.) When the alarm is highlighted, the value is changed with the control knob. Pressing the ACCEPT button activates the changes.

procedure error

When a PROCEDURE ERROR is detected, the ventilator begins SAFETY VENTILATION. For example, a procedure error occurs if a patient is attached to the ventilator before the set-up process is complete. In this case, the PROCEDURE ERROR alarm activates the SAFETY VENTILATION function. A procedure error also occurs if power is removed from the ventilator for 5 minutes or longer.

device alert

indicates that a background check detects a problem; this is a serious situation. The ventilator will reset only when an EST is run and passed.