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The test lungs meet CE guidelines.
Resistance curves
Due to the non-laminar flow, the resistance Rp (flow
resistance, parabolic resistance) depends on the flow.
As the the flow rate increases, the resistance increases
linearly and the pressure increases as the square of the
flow rate. It therefore behaves similarly to the resistance
of an endotracheal tube.
Pressure drop
Resistance
With K defined for each Rp:
Rp5
K
2.7
80.00
70.00
Rp200
60.00
50.00
40.00
30.00
20.00
10.00
0.00
0
20
The pressure drop P for various Rp values at different flow rates
(parabolic curve)
Page 18
P = K × flow
2
R = K × flow
Rp20
17.61
Rp50
40
60
Flow (L/min)
Rp50
Rp200
108.7
2440
Rp20
Rp5
80
100
120
140
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