GE Aestiva 5 Service Manual

							6 Illustrated Parts
1006-0939-000      6-76-7
Exhalation valve
Figure 6-3 • Ventilator exhalation valve
1
2
3
4
5 6
AB.23.021
7
Item Description Stock Number
1Exhalation valve cover 1503-3583-000
2Lock ring 1503-3588-000
3Seat exhalation valve 1503-3584-000
4Diaphragm assy 1503-8121-000
5Base, exhalation valve 1503-3585-000
6Blank, pop-off valve 1406-3240-000
7Tube exhalation valve 1406-3566-000 
						

							Aestiva 
6-81006-0939-000
6-8
Figure 6-4 • Breathing circuit modules
Item Description CircleBain-
Mapleson D
1Assembly (items 2-12) 1406-8102-000 1406-8211-000
2M6-1x23 Thumb Screw 1406-3304-000 1406-3304-000
3Seal lens, flow sensor 1406-3395-000 1406-3395-000
4Module Body -------- 1406-3467-000
5Seal module cover 1406-3317-000 1406-3463-000
6Split Ring 1406-3319-00 1406-3319-000
7Back plate 1406-3391-000 1406-3391-000
8O-Ring Check Valve  1406-3397-000 Not Used
9Valve Seat Check Valve  1406-3396-000 Not Used
10Disc Check Valve 0210-5297-100 Not Used
11Retainer Check Valve 1400-3017-000  Not Used
12Lens 1406-3394-000 1406-3461-000
312
7
5 4
2
1
6
AB.23.102
11
10
9
8 
						

							6 Illustrated Parts
1006-0939-000      6-96-9
Bellows
Figure 6-5 • Bellows parts
Item Description Stock Number
1 Bellows housing 1500-3117-000
2Bellows 1500-3378-000
3Rim 1500-3351-000
4Pressure relief valve assy 1500-3377-000
5Latch, rim 1500-3352-000
6Seal, base 1500-3359-000
7Base assembly, bellows 1406-8106-000
1
2
3
4
5
6
7
AB.23.055 
						

							Aestiva 
6-101006-0939-000
6-10
Test tools and system parts
Description Stock Number
Vaporizer port o-rings, external (Qty 6) 1102-3016-000
Cylinder gasket 0210-5022-300
Handle for yoke tee 0219-3372-600
Yoke plug 0206-3040-542
DIN O
2 plug (cylinder connection) 1202-7146-000
Positive low-pressure leak test device (BSI) 1001-8975-000
Positive low-pressure leak test device (ISO) 1001-8976-000
Negative low-pressure leak test device 0309-1318-800
Test lung 0219-7210-300
Krytox 1001-3854-000
Touch-up paint, Flint (medium) Gray, 18 ml 1006-3851-000
Touch-up paint, Quartz (light) Gray, 18 ml 1006-3852-000
Touch-up paint, Artic White, 18 ml 1001-3363-000
Touch-up paint, Neutral Gray N7 (medium dark), 
18 ml1006-4198-000
Touch-up paint, Neutral Gray N8 (medium), 18 
ml1006-4199-000
Touch-up paint, Neutral Gray N9 (light), 18 ml 1006-4200-000
Bulb, 2.4 watts, gooseneck lamp 1006-3673-000
Gooseneck lamp assembly 1006-3026-000
Communication port cable  1105-0512-000 
						

							1006-0939-0007-1
7-1
           7 Theory of Operation
   
     and Specifications
In this sectionVentilator theory  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-2
Pneumatic circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-9
Suction regulator (optional)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-12
O
2 flowmeter (optional). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-12
Breathing system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-13
Breathing system specifications  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-15
Pneumatic specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-17
Flow specifications  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-18
Electrical power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-19
Physical specifications  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-21
Environmental requirements  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-22
Ventilation operating specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-23
Aestiva ventilator accuracy data  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7-25 
						

							Aestiva
7-21006-0939-000
7-2
Ventilator theory
GeneralThe ventilator pneumatics are at the rear of the breathing system. 
A precision valve controls gas flow to the patient. 
During inspiration, this gas flow closes the exhalation valve and pushes the 
bellows down. 
During expiration, a small flow pressurizes the exhalation diaphragm to supply 
PEEP pressure. 
Volume and pressure measurements come from flow sensors in the flow sensor 
module. Two tubes from each sensor connect to a transducer that measures 
the pressure change across the sensor, which changes with the flow. A third 
transducer measures airway pressures at the inspiratory flow sensor.
With circle circuit modules, volume monitoring uses the right (expiratory) flow 
sensor. The ventilator uses the other sensor to adjust its output for changes in 
fresh gas flow, small leaks, and gas compression upstream of the breathing 
circuit. There is no adjustment for compression in the patient circuit. If 
necessary, add the compression loss to the tidal volume setting (volume 
control mode). The average volume changes from compression in the breathing 
circuit is small (0.5 to 1.25 mL/cmH
2O). 
For better precision:
•When the fresh gas mixture includes Heliox, use the Heliox mode (Ventilation 
setup menu). Heliox, used on some ANSI Models of the Aestiva, changes the 
data collected by the flow sensors. When Heliox mode is selected, the 
ventilator adjusts the flow sensor data to correct for these changes.
•A small quantity of gas bleeds through a resistor to help keep the pressure on 
the exhalation valve constant. At high airway pressures, this can cause a 
slight hiss during inspiration.
ww w wWW W W
AA A A
RR R R
NN N N
III I
NN N N
GG G G
Do not try to silence the pneumatic resistor. If it is blocked, the 
ventilator can malfunction and cause patient injury.
Always connect the expiratory flow sensor. If it is not connected, 
the patient disconnect alarm can not operate correctly.  
						

							7 Theory of Operation and Specifications 
1006-0939-0007-37-3
ModesThe system has four modes of mechanical ventilation:
•Volume control mode
•Pressure control mode
•Synchronized intermittent volume (SIMV) mode (optional)
•Pressure support ventilation (PSVPro) mode (optional)
Use the main menu to set the mode. 
Figure 7-1 • Ventilation Setup Menu
Volume control mode
Figure 7-2 • Volume control diagram
Volume Control supplies a set tidal volume. The ventilator calculates a flow based on 
the set tidal volume and the length of the inspiratory time (T 
I) to deliver that tidal 
volume. It then adjusts that output by measuring delivered volumes at the inspiratory 
flow sensor. Since the ventilator adjusts output, it can compensate for breathing 
system compliance, fresh gas flow, and moderate breathing system leaks. 
A typical volume controlled pressure waveform increases throughout the entire 
inspiratory period, and rapidly decreases at the start of expiration. An optional 
inspiratory pause is available to improve gas distribution.
Volume control
mode settings•VT (tidal volume)
•Rate
•I:E
•Plimit
•PEEP
AB.90.041
AB.29.068 
						

							Aestiva
7-41006-0939-000
7-4
Pressure control mode
Figure 7-3 • Pressure control diagram
Pressure control supplies a constant set pressure during inspiration. The 
ventilator calculates the inspiratory time from the frequency and I:E ratio 
settings. A high initial flow pressurizes the circuit to the set inspiratory pressure. 
The flow then decreases to maintain the set pressure (Pinspired).
Pressure sensors in the ventilator measure patient airway pressure. The 
ventilator automatically adjusts the flow to maintain the set inspiratory 
pressure. 
Pressure control
mode settings•Pinspired (control pressure)
•Rate
•I:E
•Plimit (pressure limit)
•PEEP 
SIMV mode
1. Mandatory SIMV breath
2. Spontaneous pressure supported breath
Figure 7-4 • SIMV diagram
Synchronized Intermittent Mandatory Ventilation (SIMV) is a mode in which 
periodic volume breaths are delivered to the patient at preset intervals 
(time-triggered). Between the machine delivered breaths, the patient can 
breathe spontaneously at the rate, tidal volume and timing that the patient 
desires. 
AB.29.069 
						

							7 Theory of Operation and Specifications 
1006-0939-0007-57-5
At the specified time interval, the ventilator will wait for the next inspiratory effort 
from the patient. The sensitivity of this effort is adjusted using the flow trigger level. 
When the ventilator senses the beginning of inspiration it synchronously delivers a 
volume breath using the set tidal volume, and inspiratory time that is set on the ven-
tilator. If the patient fails to make an inspiratory effort during the trigger window time 
interval, the ventilator will deliver a machine breath to the patient. The ventilator will 
always deliver the specific number of breaths per minute that the clinician has set.
In SIMV, the spontaneous breaths can be pressure supported to assist the patient 
in overcoming the resistance of the patient circuit and the artificial airway. When the 
Psupport level is set, the ventilator will deliver the pressure support level to the pa-
tient during inspiration. PEEP can also be used in combination with this mode.
 SIMV mode settings•VT   
•Rate
•Tinspired
•Psupport
•PEEP
PSVPro mode
Figure 7-5 • PSVPro diagram
PSVPro is pressure supported ventilation with apnea backup.
PSVPro is a spontaneous mode of ventilation that provides a constant pressure 
once the ventilator senses that the patient has made an inspiratory effort. The
 ventilator identifies an inspiratory effort using a flow trigger that is user adjustable. 
In this mode, the user sets the Pressure Support (Psupport) and PEEP levels. The 
patient establishes the frequency, inspiratory flow and inspiratory time. The tidal 
volume is determined by the pressure, lung characteristics and patient effort.
PSVPro uses an inspiration termination level that establishes when the ventilator 
will stop the pressure supported breath and cycle to the expiratory phase. The 
inspiration termination level is user adjustable from 5% - 50%. This parameter sets 
the percent of the peak inspiratory flow that the ventilator uses to end the inspiratory 
phase of the breath and to cycle into the expiratory phase. If the inspiration 
termination is set to 30% then the ventilator will stop inspiration when the flow 
decelerates to a level equal to 30% of the measured peak inspiratory flow. The lower 
the setting the longer the inspiratory time and conversely, the higher the setting the 
shorter the inspiratory phase. 
						

							Aestiva
7-61006-0939-000
7-6
An apnea backup mode is provided in the event the patient stops breathing. 
When setting the backup mode the user adjusts the inspiratory pressure 
(Pinsp), respiratory rate and the inspiratory time (Tinsp). As long as the patient 
triggers the ventilator within the set apnea delay time, the patient will get 
pressure-supported breaths and the ventilator will not deliver machine 
breaths. The apnea delay time can be set from 10 to 30 seconds with the 
default set at 30 seconds. 
If the patient stops triggering the ventilator for the set apnea delay period, an 
audible alarm activates and the ventilator automatically switches to the 
backup mode. The backup mode is an SIMV (Pressure Control) + PSV mode. 
Once in this mode the ventilator will begin delivering machine Pressure Control 
breaths at the inspiratory pressure level, inspiratory time and rate that the user 
has set. If, during this mode, the patient takes spontaneous breaths in between 
the machine breaths, the patient will receive pressure supported breaths. 
 
1. Mandatory pressure control breath
2. Spontaneous pressure supported breath
Figure 7-6 • SIMV-PC + PSV backup mode
When the ventilator switches to the backup mode the alarm text "Backup Mode 
Active" will be displayed and will remain in the low priority message site until 
PSVPro is re-instated or until another mode is selected. To re-activate the 
PSVPro mode the user must go into the Ventilation Mode menu and re-select 
PSVPro. Upon selecting PSVPro the ventilator will immediately begin providing 
pressure supported breaths to the patient using the established settings.
PSVPro mode settings•Pinspired 
•Rate
•Tinspired
•Psupport
•PEEP
Minimum monitoring•Shows data 
•No mechanical ventilation
•“Monitoring Only” alarm message
•“Minimum System Failure” and specific failure message 
•The software goes to minimum monitoring when a non-recoverable error 
occurs in boot-up or normal operations.