Table 1.

Geometrical parameters of the VCs in Group I, II and III

	Outer diameter	Tilt angle	Distance to the tip
Group I
Model 1	(0.5, 0.5, 0.5)	(0.0, 0.0, 45.0)	(4.0, 10.0, 16.0)
Model 2	(0.5, 0.5, 0.5)	(0.0, 45.0, 0.0)	(4.0, 10.0, 16.0)
Model 3	(0.5, 0.5, 0.5)	(45.0, 0.0, 0.0)	(4.0, 10.0, 16.0)
Group II
Model 4	(0.5, 0.5, 1.0)	(0.0, 0.0, 0.0)	(4.0, 10.0, 16.0)
Model 5	(0.5, 1.0, 0.5)	(0.0, 0.0, 0.0)	(4.0, 10.0, 16.0)
Model 6	(1.0, 0.5, 0.5)	(0.0, 0.0, 0.0)	(4.0, 10.0, 16.0)
Group III
Model 7	(1.3, 1.1, 0.5)	(0.0, 0.0, 0.0)	(4.0, 6.0, 16.0)
Model 8	(1.3, 0.94, 0.5)	(0.0, 0.0, 0.0)	(4.0, 8.0, 16.0)
Model 9	(1.3, 0.8, 0.5)	(0.0, 0.0, 0.0)	(4.0, 10.0, 16.0)
Model 10	(1.3, 0.68, 0.5)	(0.0, 0.0, 0.0)	(4.0, 12.0, 16.0)

Each entry in a bracket displays the corresponding measure in the following order: (distal segment, middle segment, proximal segment). Lengths are given in millimeters and angles in degrees. All the parameters are illustrated in Fig. 2