Table 2

Parameter variation test results
Parameters
 Perfect valve
 Diameter test
 Stiffness test
 Distribution test
 Length test
 Location test
Diameter (cm)
 1.2
 0.8
 1.6
 1.2
 1.2
 1.2
 1.2
Length (m)
 1
 1
 1
 1
 0.50
 0.75
 1
Young's modulus (kPa)
 1000
 1000
 500
 2000
 1000
 1000
 1000
Poisson's ratio
 0.5
 0.5
 0.5
 0.5
 0.5
 0.5
Blood viscosity (mPas)
 4
 4
 4
 4
 4
 4
Blood density (Kgm-3)
 1000
 1000
 1000
 1000
 1000
 1000
Gravity application time (s)
 Near instantaneous
 Near instantaneous
 Near instantaneous
 Near instantaneous
 Near instantaneous
 Near instantaneous
Valve distribution
 One
 One
 One
 Two
 One
 One
Valve location from inlet (m)
 0.5
 0.5
 0.5
 0.25 and 0.75
 0.5
 0.25
 0.75
Valve performance
 Perfect
 Perfect
 Perfect
 Perfect
 Perfect
 Perfect
First peak (mmHg)
 60.2 (8.01 kPa)
 66.3 (8.81 kPa)
 56.8 (7.55 kPa)
 56.3 (7.48 kPa)
 63.2 (8.4 kPa)
 32.6 (4.34 kPa)
 33.2 (4.41 kPa)
 46.8 (6.23 kPa)
 32.6 (4.33 kPa)
 87.2 (11.6 kPa)
Second peak (mmHg)
 81.9 (10.9 kPa)
 114.3 (15.2 kPa)
 74.9 (9.97 kPa)
 74.6 (9.92 kPa)
 95.5 (12.7 kPa)
 55.6 (7.39 kPa)
 55.9 (7.44 kPa)
 57 (7.58 kPa)
 99.3 (13.2 kPa)
 90.2 (12 kPa)
Maximum pressure (mmHg)
 93.3 (12.4 kPa)
 115.8 (15.4 kPa)
 89.5 (11.9 kPa)
 90.9 (12.1 kPa)
 104.5 (13.9 kPa)
 92.9 (12.36 kPa)
 57.2 (7.61 kPa)
 77.5 (10.31 kPa)
 110.5 (14.7 kPa)
 105.3 (14 kPa)
Dynamic pressure ratio
 1.25
 1.47
 1.22
 1.21
 1.41
 1.25
 1.53
 1.39
 1.49
 1.41
Valve closed time (s)
 0.17
 0.11
 0.19
 0.26
 0.11
 0.09 and 0.17
 0.06
 0.11
 0.16
 0.15
Maximum collapse (%)
 20.2
 3.64
 24.5
 48.2
 6.06
 35.6
 3.58
 10.6
 3.25
 42.3
Maximum expansion (%)
 9.89
 12.1
 9.87
 21.2
 5.41
 9.89
 5.92
 7.19
 11.9
 11.5

Zervides et al. BioMedical Engineering OnLine 2008 7:8   doi:10.1186/1475-925X-7-8
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