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19 Technical Specifications
Operating Modes
− non-synchronized (defibrillation on demand)
− synchronized (cardioversion)
− semiautomatic (in the presence of shockable
arrhythmias)
Energy Selection
by means of energy selector, energy to be
delivered into 50 Ohms is indicated as a numerical
value:
•
energy adjustable in steps, energy values as
energy delivered into 50 Ohms (internal defi-
brillation: energy limited to 50 Joules)
AutoSeq
2
5
7
10
20
30
50
100
150
200
300
360 Joules
•
possible deviation from selected energy less
than permitted by IEC
Defibrillator Charging
with capacitor; capacitor is charged from built-in
battery, from 12-V DC power via vehicle power
system or from the power line with optional AC
power adapter buzzer indicating "charge done"
78
Technical Specifications
•
capacitor charging time for energy setting of
360 J:
− on line power and when inserted in vehicle
mounting unit typically 9 s
− with fully charged battery typically 6 s,
− with partially discharged battery typically
7 s (max. 10
Defibrillation Shock
capacitor discharge via induction coil (Lown /
Edmark); exponential pulse shape, monophase,
damped sinusoidal halfwave:
•
pulse duration for an external resistance of 50
ohms approx. 4 ms, measured from the begin-
ning of the pulse to the intersection of the zero
line and the inflection point of the trailing pulse
edge, according to AAMI DF-2
•
in synchronized mode, the defibrillation shock
is released within 40 ms of the R-wave trigger
Discharge Circuit
serial oscillating circuit in series with external
resistance (patient):
•
capacitance 34 µF
•
inductance 26 mH
•
equivalent resistance 6 ohms
l/A
100
80
60
40
20
0
-20
2
Ra=50 Ω
Figure 19-1. Current discharge curve (360 J)
Marquette Responder® 3000
s)
=6 Ω
L=26 mH R
t
U
c
C=34 µF
4
6
8
10
Ra=100 Ω
Ra=25 Ω
P
a
12 t/ms
227 490 02-C
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