Gongal D, Thakur S, Panse A, Pawar R, Yu C Q, Foster C D
Department of Civil and Materials Engineering, University of Illinois at Chicago, Chicago, IL, USA.
Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL, USA.
Numeri Heat Transf A Appl. 2020;78(12):706-716. doi: 10.1080/10407782.2020.1805230. Epub 2020 Aug 14.
Corneal opacity is a leading cause of blindness, accounting for about 4% of global blindness. With corneal opacity, light is unable to pass through the cornea to form a clear image on the retina, resulting in blindness. To address this condition, an intraocular projection device has been designed. This device, while in use, would produce heat. According to international standard regulations, the temperature on the surface of the tissues should not increase more than 2°C due to medical devices. In order to establish the power budget of this intraocular electronic device, a steady state thermal finite element analysis was conducted on two different eye models. The device was placed at 9.98 mm from the retina, and was seen to run up to a maximum power of 82 mW for the first model and 91 mW for the second model. To reduce heating of tissues, the device was extended by 0.5 mm to create an air gap which acted as an insulator. The temperature in the nearest living tissue then dropped below the prescribed limit of 2°C at 100 mW.
角膜混浊是导致失明的主要原因，约占全球失明病例的4%。出现角膜混浊时，光线无法穿过角膜在视网膜上形成清晰图像，从而导致失明。为解决这一问题，已设计出一种眼内投影设备。该设备在使用时会产生热量。根据国际标准规定，医疗器械导致的组织表面温度升高不应超过2°C。为确定这种眼内电子设备的功率预算，对两种不同的眼部模型进行了稳态热有限元分析。该设备放置在距离视网膜9.98毫米处，第一种模型中其运行最大功率为82毫瓦，第二种模型中为91毫瓦。为减少组织发热，该设备延长了0.5毫米以形成一个起绝缘作用的气隙。在100毫瓦时，最接近的活体组织中的温度降至规定的2°C极限以下。
