title: The relationship between the vas volume and the anatomic size of the vas deferens.
abstract: The anatomic sizes of 210 vas segments from 107 volunteers of vasectomy were measured by computerized image graphic technique with microphotography. The mean equivalent-round, outer and inner diameters of the vas were 2.17 +/- 0.20 mm and 0.56 +/- 0.08 mm, respectively. The calculated thickness of vas wall was 0.81 +/- 0.21 mm. The maximal volumes of 124 vas segments (1 cm in length) were tested by injecting colored solution into vas lumen until vas rupture. The mean rupture volume of 1 cm vas lumen was 0.05 +/- 0.007 mL. A significant influence of the thickness of vas wall (p < 0.05) and body height (p < 0.05) on the rupture volume was noticed in stepwise regression analysis. A tunnel-like rupturing pattern was observed in morphological observation. The obtained rupture volume provides a security line in determining the injection volume of occlusive material or the size of the implanted contraceptive device.
authors.affiliation: Sichuan Reproductive Health Institute, Chengdu, People's Republic of China.
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: M
authors.initials: M
authors.lastname: Huang
authors.forename: H
authors.initials: H
authors.lastname: Yue
authors.forename: T
authors.initials: T
authors.lastname: Fan
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: S
authors.initials: S
authors.lastname: Li
mesh_terms: D000328:Adult; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D012044:Regression Analysis; D012421:Rupture; D014649:Vas Deferens / Q000033:anatomy & histology* / Q000293:injuries / Q000502:physiology; D014659:Vasectomy