Azukisawa Mikako, Sato Takayuki, Ito Yuki, Kamezawa Hiroshi, Nomura Eiichi, Nishide Tadayuki, Kadonosono Kazuaki, Uchio Eiichi, Goto Satoru
Department of Ophthalmology, Yokohama City University Medical Center, Japan.
Nippon Ganka Gakkai Zasshi. 2005 Jul;109(7):406-16.
A finite element computer model of the human eye after trabeculectomy was used in an experiment of simulated airbag ocular injury.
A half-layer-incised scleral flap was created on the limbus and the strength of its adhesion to the outer sclera was set at 30%, 50% and 100%. The simulations were performed at a workstation using the finite element analysis program PAM CRASH (Nihon ESI, Tokyo, Japan), and the airbag was set to hit the surface of the post-trabeculectomy eye at various velocities in two directions, straight to the corneal center or straight to the scleral flap.
In the case of airbag impact on the corneal center, the scleral flap was unlikely to rupture except when the airbag impact velocity was 40 m/sec. In the case of airbag impact on the scleral flap, at the lowest impact velocity of 20 m/sec, partial scleral flap rupture was likely to occur only at the lower adhesion strength, and scleral laceration extending to the posterior sclera was observed at impact velocities of over 30 m/sec.
These simulation results suggest that current airbags may induce globe rupture in eyes after trabeculectomy treatment.
在模拟安全气囊眼部损伤实验中使用小梁切除术后人眼的有限元计算机模型。
在角膜缘制作半层切开的巩膜瓣，并将其与外层巩膜的粘连强度设定为30%、50%和100%。使用有限元分析程序PAM CRASH（日本东京日本电装ESI公司）在工作站上进行模拟，安全气囊设置为以不同速度从两个方向撞击小梁切除术后的眼睛表面，即直接撞击角膜中心或直接撞击巩膜瓣。
在安全气囊撞击角膜中心的情况下，除非安全气囊撞击速度为40米/秒，巩膜瓣不太可能破裂。在安全气囊撞击巩膜瓣的情况下，在最低撞击速度20米/秒时，仅在较低粘连强度下可能发生部分巩膜瓣破裂，在撞击速度超过30米/秒时观察到巩膜裂伤延伸至后巩膜。
这些模拟结果表明，当前的安全气囊可能会导致小梁切除术后的眼睛发生眼球破裂。
