Synthetic cornea for corneal prostheses, which is designed to be placed in a recess in the cornea which leaves intact the Descemet membrane and is anchored by its truncated conical shape

摘要

Synthetic cornea for corneal prostheses, which is designed to be placed in a recess in the cornea which leaves intact the Descemet membrane and is anchored by its truncated conical shape. A synthetic cornea for placement into an recess made in the cornea which is made in front of and not behind the Descemet membrane. It is in a transparent flexible material and has a front face in the form of a portion of a sphere of radius Ra and a rear face in the form of a portion of a sphere of radius Rb separated by a distance 'e'. The sides give the form of a truncated cone and form an angle 'a' with the rear face. Angle 'a' is 10 to 35 degrees. The distance 'e' is 400-500 microns and angle 'a' is preferably 25-30 degrees. The diameter of the front face is 3-8mm and of the rear face 4.5- 9.5mm. Radius Rp is 6-8mm and radius Ra is 6.5-8.5mm. The front face is coated with a material favoring cellular proliferation and the rear face with a material inhibiting cellular proliferation. The cornea has a corolla in polychlorotrifluoroethylene fixed at one end to the wall of the cornea and free at the other. The cornea may also comprise an annular skirt 20-50 microns thick in the same or different material attached so that it is flush with the rear face.