PDF(Pubmed)
Abstract：
UNASSIGNED: We studied the kinetic phenomenon of an airbag impact on eyes after trabeculectomy using finite element analysis (FEA), a computerized method for predicting how an object reacts to real-world physical effects and showing whether an object will break, to sequentially determine the responses at various airbag deployment velocities.
UNASSIGNED: A human eye model was used in the simulations using the FEA program PAM-GENERISTM (Nihon ESI, Tokyo, Japan). A half-thickness 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 airbag was set to hit the surface of the post-trabeculectomy eye at various velocities in two directions: perpendicular to the corneal center or perpendicular to the scleral flap (30° gaze-down position), at initial velocities of 20, 30, 40, 50, and 60 m/s.
UNASSIGNED: When the airbag impacted at 20 m/s or 30 m/s, the strain on the cornea and sclera did not reach the mechanical threshold and globe rupture was not observed. Scleral flap lacerations were observed at 40 m/s or more in any eye position, and scleral rupture extending posteriorly from the scleral flap edge and rupture of the scleral flap resulting from extension of the corneal laceration through limbal damage were observed. Even in the case of 100% scleral flap adhesion strength, scleral flap rupture occurred at 50 m/s impact velocity in the 30° gaze-down position, whereas in eyes with 30% or 50% scleral flap adhesion strength, scleral rupture was observed at an impact velocity of 40 m/s or more in both eye positions.
UNASSIGNED: An airbag impact of ≥40 m/s might induce scleral flap rupture, indicating that current airbags may induce globe rupture in the eyes after trabeculectomy. The considerable damage caused by an airbag on the eyes of short-stature patients with glaucoma who have undergone trabeculectomy might indicate the necessity of ocular protection to avoid permanent eye damage.
UNASSIGNED: A human eye model was used in the simulations using the FEA program PAM-GENERISTM (Nihon ESI, Tokyo, Japan). A half-thickness 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 airbag was set to hit the surface of the post-trabeculectomy eye at various velocities in two directions: perpendicular to the corneal center or perpendicular to the scleral flap (30° gaze-down position), at initial velocities of 20, 30, 40, 50, and 60 m/s.
UNASSIGNED: When the airbag impacted at 20 m/s or 30 m/s, the strain on the cornea and sclera did not reach the mechanical threshold and globe rupture was not observed. Scleral flap lacerations were observed at 40 m/s or more in any eye position, and scleral rupture extending posteriorly from the scleral flap edge and rupture of the scleral flap resulting from extension of the corneal laceration through limbal damage were observed. Even in the case of 100% scleral flap adhesion strength, scleral flap rupture occurred at 50 m/s impact velocity in the 30° gaze-down position, whereas in eyes with 30% or 50% scleral flap adhesion strength, scleral rupture was observed at an impact velocity of 40 m/s or more in both eye positions.
UNASSIGNED: An airbag impact of ≥40 m/s might induce scleral flap rupture, indicating that current airbags may induce globe rupture in the eyes after trabeculectomy. The considerable damage caused by an airbag on the eyes of short-stature patients with glaucoma who have undergone trabeculectomy might indicate the necessity of ocular protection to avoid permanent eye damage.
摘要：
■我们使用有限元分析（FEA）研究了小梁切除术后安全气囊撞击眼睛的动力学现象，一种计算机化的方法，用于预测物体对现实世界物理效应的反应，并显示物体是否会破裂，以顺序确定在各种安全气囊展开速度下的响应。
■使用FEA程序PAM-GENERISTM（NihonESI，东京,日本）。在角膜缘上创建半厚度切开的巩膜瓣，并将其与外巩膜的粘附强度设置为30％，50%,和100%。气囊设置为在两个方向上以不同的速度撞击小梁切除术后眼睛的表面:垂直于角膜中心或垂直于巩膜瓣(向下凝视30°位置),初始速度为20、30、40、50和60米/秒。
■当安全气囊以20m/s或30m/s的速度撞击时，角膜和巩膜的应变未达到机械阈值，未观察到眼球破裂。在任何眼睛位置观察到巩膜瓣撕裂伤40m/s或更多，观察到巩膜瓣边缘向后延伸的巩膜破裂和角膜缘损伤导致的巩膜瓣破裂。即使在巩膜瓣粘连强度为100%的情况下，巩膜瓣断裂发生在50m/s撞击速度下30°凝视位置，而在巩膜瓣粘连强度为30%或50%的眼睛中，在两眼位置均以40m/s或更高的冲击速度观察到巩膜破裂。
■气囊撞击≥40m/s可能导致巩膜瓣破裂，表明当前的安全气囊可能在小梁切除术后引起眼球破裂。安全气囊对接受小梁切除术的身材矮小的青光眼患者的眼睛造成的相当大的损害可能表明需要进行眼部保护以避免永久性的眼睛损害。
■使用FEA程序PAM-GENERISTM（NihonESI，东京,日本）。在角膜缘上创建半厚度切开的巩膜瓣，并将其与外巩膜的粘附强度设置为30％，50%,和100%。气囊设置为在两个方向上以不同的速度撞击小梁切除术后眼睛的表面:垂直于角膜中心或垂直于巩膜瓣(向下凝视30°位置),初始速度为20、30、40、50和60米/秒。
■当安全气囊以20m/s或30m/s的速度撞击时，角膜和巩膜的应变未达到机械阈值，未观察到眼球破裂。在任何眼睛位置观察到巩膜瓣撕裂伤40m/s或更多，观察到巩膜瓣边缘向后延伸的巩膜破裂和角膜缘损伤导致的巩膜瓣破裂。即使在巩膜瓣粘连强度为100%的情况下，巩膜瓣断裂发生在50m/s撞击速度下30°凝视位置，而在巩膜瓣粘连强度为30%或50%的眼睛中，在两眼位置均以40m/s或更高的冲击速度观察到巩膜破裂。
■气囊撞击≥40m/s可能导致巩膜瓣破裂，表明当前的安全气囊可能在小梁切除术后引起眼球破裂。安全气囊对接受小梁切除术的身材矮小的青光眼患者的眼睛造成的相当大的损害可能表明需要进行眼部保护以避免永久性的眼睛损害。
