167 results about "Artificial cornea" patented technology

The present invention is an artificial cornea designed to restore vision in patients who are not candidates to receive a natural cornea transplant (allograft). The present device construction involves the use of a biocompatible, non-porous optic disk intimately bonded to one or more anchoring layers of porous polymeric material, and a unique sealing region which enhances sealing of the artificial cornea in the recipient's eye.

A material that can be applied as implants designed to artificially replace or augment the cornea, such as an artificial cornea, corneal onlay, or corneal inlay (intrastromal lens) is provided. The artificial corneal implant has a double network hydrogel with a first network interpenetrated with a second network. The first network and the second network are based on biocompatible polymers. At least one of the network polymers is based on a hydrophilic polymer. The artificial cornea or implant has epithelialization promoting biomolecules that are covalently linked to the surface of the double network hydrogel using an azide-active-ester chemical linker. Corneal epithelial cells or cornea-derived cells are adhered to the biomolecules. The double network has a physiologic diffusion coefficient to allow passage of nutrients to the adhered cells.

The objective of the present invention is to provide a collagen material that possesses physical properties to an extent that allows suturing while still maintaining the biochemical properties inherently possessed by collagen, and retains its shape for a certain amount of time even after application to the body; its production process; and, a medical material on which it is based, examples of which include a artificial tube for nerve, artificial tube for spinal cord, artificial esophagus, artificial trachea, artificial blood vessel, artificial valve or alternative medical membranes such as artificial endocranium, artificial ligaments, artificial tendons, surgical sutures, surgical prostheses, surgical reinforcement, wound protecting materials, artificial skin and artificial cornea, characterized by filling or having inside a substance having biocompatibility that can be degraded and absorbed in the body into a matrix of a non-woven fabric-like multi-element structure of collagen fibers having ultra-fine fibers of collagen as its basic unit.

An artificial cornea comprising an optical element made of an optically transparent material, having a front surface and a posterior surface, and a skirt provided so as to support with surrounding at least a part of the optical element, characterized in that the skirt is provided with a flange on its side facing the interior of eyes during implantation of the artificial cornea and the flange radially protrudes outward from the skirt. The artificial cornea can be well compatible with ocular tissue, prevent leakage of intraocular aqueous humor and intraocular invasion of bacteria, reduce stimulation on palpebral conjunctiva and further, inhibit progression of the down growth, and which has no possibility of reduction in transparency of the optical element due to the down growth as well as detachment and extrusion from the implanted state.

The invention provides a cell-less heterogenetic cornea material and manufacturing method and use, the manufacturing method for the product is: acquires the fresh animals' cornea at first; eliminates the cell membrane of the cornea material and nucleic acid with chemical method and enzyme method; carries on dehydration process to the cell-less heterogenetic cornea material; stores for backup. The method eliminates the antigenicity of the heterogenetic cornea material through eliminating the cell elements in the cornea material. At the same time, it reserves the integrity of glue fiber and transparency of the cornea. The material can be applied to construction of manmade cornea or used as the medical material for cornea transplantation, and cornea refraction operation directly.

An artificial cornea for implantation into a human body is made by a method that includes the steps of providing a natural animal cornea that has a substrate, crosslinking and fixing the substrate, minimizing the antigens from the substrate, and coupling an active layer to the substrate.

The present invention provides an artificial corneal implant having an optically clear central core and a porous, hydrophilic, biocompatible skirt peripheral to the central core. In one embodiment, the central core is made of an interpenetrating double network hydrogel and the skirt is made of poly(2-hydroxyethyl acrylate) (PHEA). In another embodiment, both the central core and the skirt are made of interpenetrating double network hydrogels. The artificial corneal implant may also have an interdiffusion zone in which the skirt component is interpenetrated with the core component, or vice versa. In a preferred embodiment, biomolecules are linked to the skirt, central core or both. These biomolecules may be any type of biomolecule, but are preferably biomolecules that support epithelial and/or fibroblast cell survival and growth. Preferably, the biomolecules are linked in a spatially selective manner. The present invention also provides a method of making an artificial corneal implant using photolithography.

The invention comprises a method of making molded, double-crosslinked (i.e., two stages of crosslinking), transparent, collagen materials using a novel combination of diafiltration, lyophilization, and homogenization. The collagen material can be used not only as an ophthalmic device, but also as a tissue scaffold, drug delivery device, wound dressing, or other collagen hydrogel based device.

An ocular lens treated so that at least a portion of the lens perimeter diminishes peripheral light focus on the interior of the eye in use, so as to ameliorate photic eye disturbances. The lens perimeter of intraocular lenses, artificial corneas and contact lenses are treated to diminish peripheral light focus.

A bicontinuous microemulsion of water, a monomer, and a surfactant copolymerizable with the monomer is polymerized to form a transparent and porous polymer defining interconnected pores. The pores may have a pore diameter in the range of 10 to 100 mm. The microemulsion may further include a drug such that, when the polymer is formed, the drug is dispersed in one or both of the polymer and the pores and is releasable therefrom when the polymer is in contact with a liquid. The drug may be an ophthalmic drug and the polyer can be used to form drug delivery devices, such as contact lenses and artificial corneas.

This invention discloses methods to attach and grow a monolayer of cultured human corneal endothelial cells onto the endothelial side of the stroma synthesized from biopolymer to generate a more bio-equivalent artificial cornea. The approaches will include the use of attachment and growth promoting agents such as fibronectin, laminin, RGDS, collagen type IV, bFGF conjugated with polycarbophil, and EGF conjugated with polycarbophil. The patent also describes a method to create a self-sustaining polymer containing adhesive molecules and growth factors to support the attachment and proliferation of cultured human corneal endothelial cells for corneal transplantation either as a half-thickness device or full-thickness button replacement. An approach for the implantation of cultured retinal pigment epithelial (RPE) cells into the sub-retinal space for treatment of age-related macular degeneration (ARMD) is disclosed in this invention. This method will enable the delivery of the transplanted RPE in a sheet of monolayer cells and will be better suited to perform their physiological function.

The invention discloses a preparation method for artificial corneas. The preparation method comprises the following steps of (1) collecting age-appropriate pig eyeballs; (2) scraping corneal epithelial cells and corneal endothelial cells of the pig eyeballs, reserving bowman layers, preparing lamellar corneas by using a lamellar blade, and drilling size-specific corneal slices; (3) putting the corneal slices obtained in step (2) in liquid nitrogen for 8-35 minutes, slowly rewarming the corneal slices to room temperature under normal temperature and normal pressure after the corneal slices are taken out, repeating the operation for 4-12 times; (4) putting the corneal slices which are subjected to freezing-thawing treatment in step (3) in normal saline for carrying out ultrasonic cleaning, wherein the ultrasonic working frequency is 20-250 kHz, and the ultrasonic time is 15-65 minutes; (5) putting the corneal slices which are subjected to ultrasonic treatment in a buffer system, carrying out enzymolysis on DNA (Deoxyribose Nucleic Acid) of corneal stromal cells by using endonuclease, and obtaining the artificial corneas. According to the artificial corneas prepared by the preparation method disclosed by the invention, gaps between natural collagen fibers of the artificial corneas are beneficial for inducing the growth of the corneal cells and the growth of nerve fibers of an acceptor and promoting the repairing and the reconstructing of corneas of a donor.

The invention discloses an artificial cornea which is composed of an optical portion and a supporting portion. The optical portion and the supporting portion are integrally formed through three-dimensional printing, the optical portion is arranged in the center of the artificial cornea, the supporting portion is arranged at the periphery of the optical portion and of a net-shaped multi-hole structure, and accordingly the biological synthesis between the artificial cornea and a receptor tissue is improved. An artificial cornea in the prior art uses a lens column-supporting two-piece mode, an optical portion and a supporting portion of the artificial cornea in the prior art are separated, and aqueous fluid leakage and serous complication like endoophthalmitis are prone to happening after operation to cause transplantation failure. The integrated artificial cornea is manufactured through a three-dimensional printing technique. By means of an integrated structure, the whole artificial cornea is firm and stable in structure, not prone to deforming and capable of solving the problems caused by the two-piece artificial cornea. Individual data models can be manufactured according to parameters of an eyeball in different age groups or CT and UBM three-dimensional scanning parameters of a patient, so that individual artificial cornea can be manufactured.

The present invention features a hybrid superporous hydrogel scaffold for cornea regeneration and a method for producing the same. The hybrid hydrogel is composed of a superporous poly(2-hydroxyethyl methacrylate) (PHEMA) and poly(methyl methacrylate) (PMMA) copolymer mixed with collagen. The hybrid scaffold can be used as a suturable hybrid corneal implant or keratoprosthesis.

The construction of human corneal endothelium cell line with corneal endothelium as material includes the steps of: the first adherent culture of human corneal endothelium cell inside DMEM/F12 culture liquid with ox embryo serum in 20 wt%, chondroitin sulfate oxidizing and degrading matter, epidermal cell growth factor, basic fibroblast growth factor and ox eye auxin to obtain pure corneal endothelium cell; and the subsequent secondary culture in trypsinization process. The technological process is scientific and reasonable, and up to now, passage cell of 106-th generation has been obtained. The human corneal endothelium cell line of the present invention has no any virus or cancer genetic transfection, has no any tumorigenicity, and is expected to be used in direct artificial cornea production and clinical application.

An artificial cornea is fabricated by separately culturing live stromal cells, live corneal endothelial cells (CECs) and live corneal epithelial cells (CEpCs), and 3D bioprinting separate stromal, CEC and CEpC layers to encapsulate the cells into separate hydrogel nanomeshes. The CEC layer is attached to a first side of the stromal layer and the CEpC layer to a second side of the stromal layer to define the artificial cornea.

The invention relates to technology of medical biological material with natural polymer, and discloses a tussah silk fibroin film and a preparation method thereof. Nontoxic dihydric alcohol is added into tussah silk solution so as to be taken as a cross-linking agent which is injected into a mold, and the tussah silk fibroin film is formed after the mixture drying. According to weight, the tussah silk fibroin film contains 40-90% of tussah silk fibroin; the protein leaching loss of the film in water with the temperature 37 DEG C for 24 hours is less than 3%, the tensile strength at break is greater than 20Mpa, and the tensile elongation at the break is greater than 20%. As an extra chemical cross-linking agent or chemical denaturant does not need to be added in the preparation process, the biocompatibility of the tussah silk fibroin can not be reduced, and can be kept good. The tussah silk fibroin difficult to dissolve can be used for covering materials for artificial cornea, endocranium, gullet, heart valve, blood vessels and wound surfaces, and can be used for temporal covering, and isolating tissues, and can be taken as medicine releasing materials and the like.

The present invention features a superporous hydrogel scaffold for corneal regeneration or replacement and a method for producing the same. The superporous hydrogel is composed of a poly(2-hydroxyethyl methacrylate) (PHEMA) and poly(methyl methacrylate) (PMMA) copolymer mixed with collagen. The scaffold can be used as a suturable hybrid corneal implant or keratoprosthesis.