Additive manufacturing inside the human eye
Additive manufacturing techniques are used to form an artificial intra-ocular lens (IOL) directly inside the human eye. Small openings are formed in the cornea and lens capsule of the eye, and the crystalline lens is broken up and removed through the openings; then, a material is injected into the lens capsule through the openings, and the focal spot of a pulse laser beam is scanned in a defined pattern in the lens capsule, to transform the material in the vicinity of the laser focal spot to form the IOL in a layer-by-layer manner. In one embodiment, stereolithography techniques are used where a pulse UV laser source is used to photosolidify a photopolymer resin. The liquefied resin is injected into the eye through the openings, after which only part of the resin, having the shape of the desired IOL, is selectively cured with the UV laser beam, via progressive layer formation.
1. A method for forming an artificial intra-ocular lens (IOL) inside a patient's eye, comprising:
using a pulse laser beam from a laser system to form an opening in a cornea and an opening in a lens capsule of the patient's eye;
using the pulse laser beam from the laser system to break up a crystalline lens of the eye from the lens capsule;
removing the broken up crystalline lens through the openings in the cornea and the lens capsule;
injecting a liquefied photopolymer resin into the lens capsule through the openings in the cornea and the lens capsule, wherein the injected liquefied photopolymer resin forms a volume of the liquefied photopolymer resin inside the lens capsule; and
forming said artificial IOL directly inside the lens capsule by scanning a focal spot of the pulse laser beam from the laser system inside the lens capsule in a defined scanning pattern to transform the liquefied photopolymer resin in a vicinity of the focal spot of the pulse laser beam;
wherein the liquefied photopolymer resin is photosolidified in the vicinity of the focal spot of the pulse laser beam;
wherein the forming step includes:
adjusting a depth of the focal spot of the pulse laser beam within the volume of the liquefied photopolymer resin;
scanning the focal spot of the pulse laser beam in a lateral plane at the adjusted depth across a defined area; and
repeating the adjusting step and the scanning step such that the liquefied photopolymer resin is transformed in a layer by layer manner to form the IOL; and
wherein the scanning pattern of the focal spot of the pulse laser beam for each layer is determined based on the properties of the photopolymer resin and the desired shape of the IOL to be formed.
2. The method of claim 1 , wherein the liquefied photopolymer resin includes a water-soluble crosslinkable poly(vinyl alcohol) prepolymer, and wherein the pulse laser beam is a UV pulse laser beam.
3. The method of claim 1 , further comprising, after the forming step:
removing untransformed polymer material from the lens capsule.