APPENDIX
APPENDIX
APPENDIX
For other cylinder sizes, use the following gas usage chart to estimate your cylinder duration.
OXYGEN USAGE (LPM) TABLE
BREATHS PER MINUTE (BPM)
12
14
16
18
20
22
24
26
28
Volume (ml)
Oxygen Usage (LPM)
50
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
100
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
150
1.8
2.1
2.4
2.7
3.0
3.3
3.6
3.9
4.2
200
2.4
2.8
3.2
3.6
4.0
4.4
4.8
5.2
5.6
250
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
500
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
750
9.0
10.5
12.0
13.5
15.0
16.5
18.0
19.5
21.0
NOTE:
This table uses a PEEP value of 0 cmH
2
O.
CYLINDER DURATION EQUATION
For other cylinder sizes or partially-filled cylinders, the following equation can be used in conjunction with the
above oxygen usage table to estimate cylinder duration.
cylinder duration =
Where:
P
T
= cylinder pressure (typically 2200 PSI for full cylinder)
V
T
= empty cylinder volume (4.5L for an E cylinder).
REPLACING THE SOURCE GAS CYLINDER
When the source gas cylinder needs to be replaced:
Place the patient on an alternate means of ventilation, if necessary.
Power off the ventilator.
NOTE:
Alarms might be encountered and/or the selected Activity Button might be inadvertently changed if
the ventilator is not powered off before replacing the cylinder.
Turn off the oxygen supply according to the regulator and gas supply manufacturers’ instructions.
Remove the regulator and attached source gas supply hose from the used cylinder by turning the handle
counterclockwise.
Slide the regulator over the neck of the new cylinder, and line up the pins on the regulator with the holes in
the cylinder neck. Tighten the tee screw on the regulator by turning the handle clockwise. (The source gas
supply hose should still be connected to the regulator.)
Turn on the oxygen supply according to the regulator and gas supply manufacturers’ instructions.
Power on the ventilator.
NOTE:
Ventilation will not begin until an Activity Button is selected. For more information see "Choosing an
Activity Button (Patient Selectable) to Begin Ventilation" on page 67.
( )
P
T
V
T
14.7
gas usage
POTENTIAL TIDAL VOLUMES
The potential tidal volumes for the corresponding set volumes on the Life2000
®
Ventilator are shown in the
following graph. The graph can be used to obtain approximate values only.
The potential patient volume per breath is a combination of ventilator settings (Volume and I-Time) plus the
amount of room air entrained to the patient interface plus the amount of supplemental oxygen (if any) that is
injected into the patient interface. It is further influenced by the patient’s resistance, compliance and effort. As a
result, the potential patient volume will be higher than the ventilator set volume.
NOTE:
This graph uses a PEEP value of 0 cmH
2
O.
0
100
200
300
400
500
600
700
800
900
1,000
1,100
1,200
1,300
1,400
1,500
1,600
1,700
1,800
1,900
2,000
50
150
250
350
450
550
650
750
Volume setting on Life2000™ Ventilator (ml)
Potential patient volume (ml)
Minimum potential patient volume (ml)
Maximum potential patient volume (ml)
APPENDIX
