Construction of the Mechanical Model of Keratoprosthesis of the Ocular Cornea

Abstract

By developing ocular prostheses, a number of problems arise, one of which is the design of the connection between the rigid optical part and the soft tissue of the cornea ; their Young’s modules can differ by three orders of magnitude. In this case, the problem arises of creating some intermediate layer , possibly with gradient properties, the purpose of which is to exclude injury to soft biological tissues. An analytical and finite element modeling of the interaction of a cylindrical optical prosthesis , an intermediate heterogeneous layer and the cornea , in the framework of elastic media, in two versions: (i) without taking into account curvature (round plate ) and (ii) taking into account curvature (spherical dome or shell), was performed. In a simplified model, the intermediate layer is represented as a spring layer, the determination of the rigidity of which will allow one to create an original design. Based on the proposed models, the stress-strain state of soft biological tissues was calculated.