Servo Ventilator 300/300A
Description of functions
E382 E380E 061 01 03 01
Siemens-Elema AB
51
2
A calculation is made at the end of inspiration
n
to achieve a new calculated pressure value
P
CALC (
n
)
using one of the formulas (1) or (2) or
(3) below.
P
CALC
(n)
= P
in use
(n)
X
TV
P
TV
M
(1)
P
CALC
(n)
= P
in use
(n)
X
MV
P
MV
M
(2)
P
CALC
(n)
= P
in use
(n)
X X 150%
TV
P
TV
M
(3)
TV
P
= Preset Tidal Volume
TV
M
= Measured Inspiratory Tidal Volume
MV
P
= Preset Minute Volume
MV
M
= Measured Inspiratory Minute Volume
The following choise is made between
formulas (1), (2) and (3):
(1)
if the calculated breathing frequency f
CALC
fulfills:
f
CMV
= f
CALC
or
f
CMV
< f
CALC
Applicable both for the PRVC mode and for
the VS mode.
(2)
if the calculated breathing frequency
f
CALC
fulfills:
2/3 x f
CMV
< f
CALC
< f
CMV
Only applicable for the VS mode.
(3)
if the calculated breathing frequency
f
CALC
fulfills:
f
CALC
< 2/3 x f
CMV
Only applicable for the VS mode.
The value f
CMV
is the CMV frequency
according to front panel setting.
The parameter f
CALC
is calculated every breath
(in VS mode). In breath number
n
the value is
f
CALC
(n)
=
1
T
(n)
T
(
n
)
is the measured time from end of
inspiration number
n
1 to end of inspiration
number
n
.
The result of the above choise of formula,
(1)
or
(2)
or
(3)
is that the target Tidal Volume
(TV) depends on the calculated Breathing
frequency (f
CMV
) as illustrated in the diagram:
150% x TV
P
TV
P
2/3 x f
CMV
f
CMV
f
CMV
A
B
C
Diagram: Target Tidal Volume vs calculated
Breathing frequency
A
: Const. Tidal Volume TV = 150% x TV
P
(3)
B
: Const. Minute volume MV = MV
P
(2)
C
: Const. Tidal Volume TV = TV
P
(1)
The calculated pressure value P
CALC (
n
)
is used
to calculate the pressure difference value:
P
DIFF (
n
)
= P
CALC (
n
)
P
IN USE (
n
)
(4)
The parameter P
DIFF
is thus updated once
every breath. P
DIFF
is used to assign a new
value to the parameter P
REF
to be used during
the next breath (during inspiration number
n
+1):
P
REF (
n
+ 1)
= P
REF (
n
)
+ F
(
n
)
(P
DIFF
)
(5)
The value of F depends on the value of P
DIFF
.
Содержание Servo Ventilator 300
Страница 4: ...4 Siemens Elema AB E382 E380E 061 01 03 01 Servo Ventilator 300 300A Notes Notes ...
Страница 6: ...6 Siemens Elema AB E382 E380E 061 01 03 01 Servo Ventilator 300 300A Notes Notes ...
Страница 18: ...20 Siemens Elema AB E382 E380E 061 01 03 01 Introduction Servo Ventilator 300 300A 1 Notes ...
Страница 22: ...20 Siemens Elema AB E382 E380E 061 01 03 01 Introduction Servo Ventilator 300 300A 1 Notes ...
Страница 114: ...5 112 Siemens Elema AB E382 E380E 061 01 03 01 Troubleshooting Servo Ventilator 300 300A Notes ...
Страница 130: ......
