[Biomechanical analysis of the pulmonary trauma by localized blunt force--thoracic force-deflection in pigs].
Thoracic force-deflection characteristics have been measured in the living little pigs as a step towards the analysis of thoracic injury in the field of forensic medicine. Mechanisms of injury by hand impact with a small stone were investigated by means of high speed video/camera and load cell. Initial velocity by hand impact ranges from 5.8 to 11.1 m/s, with corresponding peak force from 24 to 122 kgf. The thoracic force-deflection of the pig shows a progress change with increasing impact velocity, showing more of a spring-mass like response with an initial linear region of stiffness during a short interval immediately after the impact. Peak force up to 122 kgf was developed for 77 mm in the localized thoracic displacement with rib fractures and serious lung injury. A few rib fractures occurred with initial velocity near 9 m/s and displacement near 50 mm, these data suggest an outbreak limit of rib fractures of the little pig.
Ueyama
M
M
Saito
S
S
Mukaida
M
M
Ishiyama
I
I
D000818:Animals; D001696:Biomechanical Phenomena; D055370:Lung Injury; D012253:Rib Fractures / Q000503:physiopathology; D013552:Swine; D013909:Thorax / Q000503:physiopathology*; D014949:Wounds, Nonpenetrating / Q000503:physiopathology*