Keratoprosthesis apparatuses, systems, and methods
The present disclosure relates to keratoprosthesis apparatuses and methods of manufacturing keratoprosthesis apparatuses. The keratoprosthesis apparatus includes a circular backplate including a central aperture extending through the backplate from a face of the backplate to a posterior surface of the backplate. The circular backplate has a dome shape and comprises a plurality of spaced apart elongated slits extending radially outwardly from a central portion of the backplate. The plurality of spaced apart elongated slits surround the central aperture and extending through the backplate from the face of the backplate to the posterior of the backplate.
1. A keratoprosthesis apparatus comprising:
a circular backplate including a central aperture extending through the backplate from a face of the backplate to a posterior surface of the backplate,
wherein the circular backplate has a dome shape and comprises a plurality of spaced apart elongated slits extending radially outwardly from a central portion of the backplate surrounding the central aperture and extending through the backplate from the face of the backplate to the posterior surface of the backplate,
wherein the elongated slits widen along their respective longitudinal axes from the central aperture of the backplate to an outer circumferential edge of the backplate, and
wherein each elongated slit comprises a portion of a circle at each end of the slit, and wherein the portion of a circle adjacent to the outer circumferential edge has a larger radius of curvature than the portion of a circle adjacent to the central aperture.
2. The apparatus according to claim 1 , wherein the face of the backplate is colored to match a color of a patient's iris.
3. The apparatus according to claim 1 , wherein the circular backplate is composed of titanium.
4. The apparatus according to claim 1 , wherein the posterior surface has a greater roughness than the face.
5. The apparatus according to claim 4 , wherein the face is polished.
6. A method of manufacturing a keratoprosthesis apparatus comprising:
forming a central aperture through a circular backplate sheet to extend through the circular backplate sheet from a face of the backplate sheet to a posterior surface of the backplate sheet;
forming a plurality of spaced apart elongated slits elongated in a radial outward direction, wherein the plurality of spaced apart elongated slits are formed:
to extend through the circular backplate sheet from the face of the backplate to the posterior surface of the backplate;
through the circular backplate sheet such that the plurality of spaced apart elongated slits encircle the central apertures;
to widen along their respective longitudinal axes from the central aperture of the backplate to an outer circumferential edge of the backplate, and
to comprise a portion of a circle at each end of the elongated slit and wherein the portion of a circle adjacent to the outer circumferential edge has a larger radius of curvature than the portion of a circle adjacent to the central aperture; and
bending the backplate sheet into a dome shape.
7. The method according to claim 6 , wherein forming the central aperture and the plurality of spaced apart elongated slits comprises electrochemically etching the central aperture and the plurality of spaced apart elongated slits.
8. The method according to claim 6 , wherein forming the central aperture and the plurality of spaced apart elongated slits comprises laser cutting the central aperture and the plurality of spaced apart elongated slits.
9. The method according to claim 6 , wherein forming the central aperture and the plurality of spaced apart elongated slits comprises forming the central aperture and the plurality of spaced apart elongated slits with substantially no temperature increase to the backplate sheet.
10. The method according to claim 6 , wherein bending occurs via a mold.
11. The method according to claim 6 , further comprising grit blasting the posterior surface of the backplate to increase surface roughness.
12. The method according to claim 6 , further comprising coloring a face of the backplate sheet via electrochemical anodization.
13. The method according to claim 6 , further comprising cutting the circular backplate sheet from a titanium sheet.
14. A keratoprosthesis apparatus comprising:
a collar-button front plate including a stem extending from a cap portion; and
a circular backplate including a central aperture extending through the backplate from a face of the backplate to a posterior surface of the backplate,
wherein the stem extends through the central aperture,
wherein the circular backplate has a dome-shape and comprises a plurality of spaced apart elongated slits extending radially outwardly from a central portion of the backplate surrounding the central aperture and extending through the backplate from the face of the backplate to the posterior surface of the backplate,
wherein the elongated slits widen along their respective longitudinal axes from the central aperture of the backplate to an outer circumferential edge of the backplate, and
wherein each elongated slit comprises a portion of a circle at each end of the slit, and wherein the portion of a circle adjacent to the outer circumferential edge has a larger radius of curvature than the portion of a circle adjacent to the central aperture.
15. The keratoprosthesis apparatus according to claim 14 , further comprising a corneal graft coupled to the stem between the cap portion of the collar-button front plate and the backplate.
16. The keratoprosthesis apparatus according to claim 14 , wherein the face of the backplate is colored to match a color of a patient's iris.