Partial coating of intraocular lenses using spatial atomic layer deposition
A system and method for efficiently modifying the surface of an intraocular lenses to reduce tackiness and improve lens unfold time and unfold time consistency, and a product created using the system and method, is disclosed. In some embodiments, the system and method utilizes at least part of a lens-forming device as a mask.
1 . A method for coating an intraocular lens, the intraocular lens having a lens surface, the method comprising: delivering the intraocular lens to a conveyor, the intraocular lens positioned within an interior space set into a top surface of a substrate holder such that the intraocular lens is positioned below the top surface of the substrate holder; activating a processing device, the processing device comprising a plurality of coating segments, each coating segment comprising: a first inert gas source configured to provide a first inert gas directly to the intraocular lens on the conveyor, a precursor source configured to provide a precursor gas directly to the intraocular lens on the conveyor; a second inert gas source configured to provide a second inert gas to the intraocular lens on the conveyor; and a plasma source configured to provide plasma to the intraocular lens on the conveyor; wherein the first inert gas source, the precursor source, the second inert gas source, and the plasma source of each coating segment are separated from the top surface of the substrate holder by a process gap; adding a first layer of coating by passing the intraocular lens from the conveyor through a first coating segment of the processing device using relative movement between the processing device and the conveyor, adding the first layer of coating comprising the steps of: delivering the first inert gas into the interior space and to the intraocular lens via the first coating segment; delivering the precursor gas into the interior space and to the intraocular lens via the first coating segment, subsequent to providing the first inert gas; delivering the second inert gas into the interior space and to the intraocular lens via the first coating segment, subsequent to providing the precursor gas; and delivering the plasma into the interior space and to the intraocular lens via the first coating segment, subsequent to providing the second inert gas; and adding a second layer of coating by passing the intraocular lens via the conveyor through a second coating segment of the processing device directly after the first coating segment, adding the second layer of coating comprising the steps of: delivering the first inert gas into the interior space and to the intraocular lens via the second coating segment, subsequent to adding the first layer of coating; delivering the precursor gas into the interior space and to the intraocular lens via the second coating segment, subsequent to providing the first inert gas; delivering the second inert gas into the interior space and to the intraocular lens via the second coating segment, subsequent to providing the precursor gas; and delivering the plasma into the interior space and to the intraocular lens via the second coating segment, subsequent to providing the second inert gas, wherein a layer of coating is applied to the intraocular lens each time the intraocular lens passes under a coating segment.
2 . The method of claim 1 , wherein the intraocular lens is a molded intraocular lens.
3 . The method of claim 1 , wherein the intraocular lens comprises a lens body and at least one support structure, the method comprising displacing at least a portion of the support structure from a mold half that was used to mold one side of the lens body and the support structure.
4 . The method of claim 1 , wherein the substrate holder is formed at least in part by a portion that was used to form the intraocular lens.
5 . The method of claim 1 , wherein the substrate holder is a mold half.
6 . The method of claim 1 , wherein the substrate holder is a device configured to hold the intraocular lens during a lathing process.
7 . The method of claim 1 , wherein the first inert gas source, the precursor source, the second inert gas source, and the plasma source of each coating segment are positioned 1 mm to 5 mm apart from the lens surface.
8 . The method of claim 1 , wherein the precursor gas comprises one or more of bis(diethylamino) silane, tris(dimethylamino) silane, di(isopropylamino) silane, benzyltrimethylsilane, tetraethyl orthosilicate, hexamethyldisiloxane, tri-chloro-silane, aluminum bromide, aluminum trichloride, trimethyl-aluminum, trimethylamine alane, aluminum tri-sec-butoxide, Tetrakis(dimethylamino)titanium(IV), titanium tetrachloride, titanium tetraisopropoxide, and combinations thereof.
9 . The method of claim 1 , wherein the processing device deposits a coating of silicon dioxide on a surface comprising one of an anterior surface of the intraocular lens, a support structure coupled with the intraocular lens, or combinations thereof.
10 . The method of claim 1 , wherein the plasma source comprises one or more of oxygen plasma, nitrogen plasma, carbon monoxide plasma, carbon dioxide plasma, and nitric oxide plasma.
11 . The method of claim 1 , wherein the method is performed at a temperature of 25° C. to 90° C.