WO1998020813A1 - Cornee artificielle - Google Patents
Cornee artificielle Download PDFInfo
- Publication number
- WO1998020813A1 WO1998020813A1 PCT/JP1997/004076 JP9704076W WO9820813A1 WO 1998020813 A1 WO1998020813 A1 WO 1998020813A1 JP 9704076 W JP9704076 W JP 9704076W WO 9820813 A1 WO9820813 A1 WO 9820813A1
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- WIPO (PCT)
- Prior art keywords
- artificial cornea
- eye
- optical
- support
- section
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/142—Cornea, e.g. artificial corneae, keratoprostheses or corneal implants for repair of defective corneal tissue
Definitions
- the present invention relates to artificial corneas. More specifically, it is used to replace the cornea that has lost or lost the cornea due to ocular tissue diseases, etc., and to restore visual function. Related to the artificial cornea. Background art
- the artificial cornea is generally composed of an optical part made of a light-transmitting material having good biocompatibility, and an artificial cornea which is fixed to the surface of human eye tissue, or has an anterior layer and a posterior layer of the cornea. It is composed of a supporting portion for supporting the optical portion by inserting the optical portion.
- an optical part and a support part are integrally formed of the same material, but these optical parts and the support part are formed of different materials. Combinations are known.
- materials for such artificial corneas polymethyl methacrylate, silicone, and the like are mainly used.o
- These artificial corneas are made of soft, porous fluororesin whose support is only a microporous structure. Therefore, it is difficult to prevent the outflow of aqueous humor in the eye and the invasion of bacteria and the like.
- an artificial cornea having a support member made of a hard material such as metal has been proposed.
- it is extremely difficult to suture the support member with a suturing needle to suture the support member with a suturing needle, and this also causes the loss of aqueous humor.
- the corneal tissue is necrotic, the corneal tissue is necrotic, and the artificial cornea falls off. There is a drawback.
- corneal prostheses suffer from problems such as increased intraocular pressure, loss of aqueous humor from the pores, invasion of bacteria, and adhesion to the surrounding ocular tissue.
- the inventors of the present invention have conducted intensive studies, and found that the present inventors have found that the present inventors have found that the present inventors have found that the present inventors have found that the present inventors have found that the present inventors have found that the present inventors have found that the present inventors have found that there is a need for cohesion with ocular tissues, the outflow of aqueous humor in the eye, and bacteria in the eye. Solved problems such as invasion and irritation to the conjunctiva The determined artificial cornea was found (Japanese Patent Application Laid-Open No. 9-118727). As shown in FIG. 8, the artificial cornea is composed of an optical part 2 and a support part 3 having a fine gap structure, and a non-permeable layer 5 is provided on the surface.
- the cornea is a high-value, highly-utilized, artificial cornea that has solved various conventional problems.
- Akira was made with the aim of making further improvements to the corneal prosthesis ⁇ > 0
- the down-growth force gradually progressed and proliferated. If 1 covers the back of the optical section 2, it must be strong enough to prevent the transparent section of the optical section 2 from being maintained. As described above, the support portion 3 has a fine gap. Due to the structure, even if the corneal tissue 6 and the artificial cornea 10 are firmly joined to each other, it is possible to obtain the artificialness by the dangling. The cornea 10 is pushed forward (outside the eye) and is removed from the corneal tissue 6 and falls off. Power
- the present invention has been made in view of the above prior art, and has good fusion with ocular tissue, prevents outflow of aqueous humor in the eye, and invasion of bacteria and the like into the eye. In addition to preventing, it can reduce irritation to the conjunctiva of the eyelids, and can also inhibit the progress of down-growth,
- the purpose of the present invention is to provide an artificial cornea that is not likely to reduce the transparency of the optical part and to float and fall off from an implanted state. Disclosure of the invention
- the present invention provides an optical section having a front surface and a rear surface, which is made of an optically transparent material, and which supports at least a part of the optical section.
- An artificial cornea comprising a support part of the eye, and a support part on the side facing the inner part of the eye when the artificial cornea is implanted, protruding radially outward from the support part.
- the present invention relates to an artificial cornea characterized by being provided with a projected collar portion.
- FIG. 1 is a schematic cross-sectional view showing one embodiment when the artificial cornea of the present invention is implanted in corneal tissue.
- FIG. 2 is a schematic cross-sectional view showing one embodiment of the artificial cornea of the present invention.
- FIG. 3 is a schematic cross-sectional view showing one embodiment of the artificial cornea of the present invention.
- FIG. 4 is a schematic cross-sectional view showing one embodiment of the artificial cornea of the present invention.
- FIG. 5 is a schematic cross-sectional view showing one embodiment of the artificial cornea of the present invention.
- FIG. 6 is a schematic sectional view of the artificial cornea obtained in Example 1 of the present invention.
- FIG. 7 is a schematic sectional view of the artificial cornea obtained in Example 2 of the present invention.
- FIG. 8 is a schematic sectional view showing a tenth embodiment when a conventional artificial cornea is implanted in corneal tissue.
- FIG. 9 is a schematic cross-sectional view showing one embodiment when a conventional artificial cornea is implanted in corneal tissue.
- the artificial cornea of the present invention has an anterior surface and a posterior surface, is, and has an optical portion made of an optically transparent material, and at least a part of the optical portion. It consists of a support part for surrounding and supporting, and a support part on the side facing the inside of the eye when the artificial cornea is implanted, and a radial outward part from the support part. It is characterized by the fact that a protruding cover part is provided on the base.
- the optical part used for the artificial cornea of the present invention has a front surface and a rear surface, and is made of an optically transparent material.
- the optical part is located almost at the center of the artificial cornea, and performs its visual function by maintaining transparency.
- the material used for the optical part is the inner surface of the artificial cornea (later
- aqueous humor may come into direct contact with the aqueous humor in the eye, so it is harmless to the human body and preferably safe.
- contact lenses intraocular lenses
- Such materials include, for example, polyurethanes, silicones, polymethyl methacrylates, etc.
- Polyester represented by resin, polyethylene terephthalate, etc., etc. are clarified, and the transparent ones are evident from these. Is selected and used.
- the planar shape of the optical section is not particularly limited, and may be any shape as long as there is no problem in practical use, but the mechanical strength is maintained while maintaining the mechanical strength. In order to prevent deformation due to pressure from inside, and in normal corneal transplantation, it is necessary to punch out the corneal replacement part with a circular treadpan. Considering the fact that there are many points, it is preferable that the shape be circular.
- the diameter of the optical section is generally different because it depends on the size of the site of the eye tissue to be replaced with the artificial cornea. Cannot be determined. The reason is that the diameter between the ends of the support portion (the outer diameter of the support portion) differs depending on the size of the tissue to be replaced, and therefore, it is a component of the support portion. That is, the optical portion is determined in consideration of the width of the support portion where the suturing property and cell invasiveness can be exhibited without impairing the visual function. In consideration of these facts, and from a practical point of view, it is preferable that the diameter of the optical section is usually about 2 to 8 mm, more preferably about 3 to 6 mm. It is better.
- the thickness of the optical section is preferably about 0.05 to about L mm from the viewpoint of mechanical strength. Such a thickness may be changed by changing the thickness of the center part and the peripheral part in order to provide the number of bends as necessary, for example, the optical part. At least part of the surface should be spherical.
- the optical In order to provide the lens unit with a lens power, spherical surfaces having different curvatures may be provided on the front surface and the rear surface of the optical unit, respectively.o
- a support section is used to fix the optical section in the eye.
- the support portion is provided so as to surround and support at least a part of the optical portion.
- the supporting portion is formed of a flexible material having a fine gap structure.
- the flexible material having the fine interstitial structure has an advantage that the suture with the eye tissue is facilitated and the adhesion with the eye tissue is strengthened.
- cells and capillaries derived from the surrounding eye tissue in which the artificial cornea is implanted penetrate into the fine gaps of the flexible material, and the artificial cornea and the eye tissue As a result, and become tightly bound with affinity.
- the flexible material having the fine interstitial structure has a mechanical strength to the extent that it is not torn by suturing, and cells derived from the surrounding ocular tissue are physically separated. It has a gap that allows it to penetrate into the interior, is fused with ocular tissue, adheres tightly, and is more biocompatible. It is preferably used as a material that comes into contact with or is implanted in living organisms, such as contact lenses and intraocular lenses. You can use materials that can be used. Such materials include, for example, polyurethan, silicone, collagen, polypropyrene, polystyrene, and the like. Such materials include spunbond nonwoven fabrics made of the above materials, and soft foams having open cells represented by sponges.
- the average pore size of the fine pores into which cells can enter is described by Jean T. Jacob-LaBarre (Progress in Biomedica 1 Polymers, Plenum Press, New York, P. 27-39, (1990)). According to), it is 10 to 10 0 // 111. As a result, even the flexible material used in the present invention has a microstructure having a gap (void size) in a range of almost this range. It just needs to be a thing.
- the planar shape of the support portion is not particularly limited, and may be any shape as long as there is no problem in practical use, but the mechanical strength is maintained while maintaining the mechanical strength. It is preferable to have a concentric annular shape from the viewpoint of preventing deformation due to pressure from inside.
- the inner diameter is usually equal to the diameter of the optical portion.
- the outer diameter varies depending on the size of the portion of the ocular tissue to be replaced with the artificial cornea, it cannot be determined unconditionally.
- it should be the same size as the incised eye tissue (excised corneal piece) at the replacement site or about 0.5 mm larger.
- it is preferably about 6 to 20 mm, especially about 7 to 16 mm in practical terms.
- the thickness of the support portion is not generally specified, but is usually about 0.1 to 3 mm, and more preferably about 0.2 to 2.5 mm. And are preferred in practical terms. In particular, it is ideal that the thickness of the supporting portion is approximately the same as the thickness of the corneal incision cross section, and furthermore, a non-permeable layer described later is provided. If it is installed, [(thickness of non-permeable layer) + (thickness of support portion)-1 (thickness of collar portion)] is the thickness of the corneal incision section. This is very good.
- the support portion is provided with the curvature of the cornea. It is preferable to provide a curvature that matches.
- the cells derived from the eye tissue grow in the microscopic interstices of the flexible material, they adhere to the interfacial interface when the cells grow.
- such flexible materials are, after all, difficult to firmly bond to ocular tissue.
- a surface modification such as plasma treatment.
- the surface modification of the flexible material refers to the surface of the material forming the fine interstitial structure, for example, in the case of a nonwoven fabric, the surface of a fiber, for example, open cells. In the case of a foam with a bubble, the decoration on the surface is used.
- a non-permeable layer is provided on at least the surface or the inside of the flexible material constituting the supporting portion. Is preferred.
- the aqueous humor in the eye can be seen from the fine gaps in the flexible material. Can be effectively prevented from escaping.
- the surface of the flexible material (the surface in contact with the eyelid conjunctiva) is provided with a water-impermeable layer, the surface of the water-impermeable layer is smooth.
- the eyelid conjunctiva that occurs when you blink There is an IJ point that it is possible to reduce the irritation caused by friction.
- the water-impermeable layer has a substantially non-water content or a water content. It is preferable to have a low water content of 10% or less.
- Materials used for the impermeable layer include, for example, contact with living bodies such as contact lenses and intraocular lenses, and implantation in living bodies. It is possible to use materials used as waste materials, such as polyurethan, silicone, and polymethylene Acryl resin represented by crelet, polystyrene resin represented by polyethylene phthalate, etc. It is. These resins may contain a fluorine atom for improving the water impermeability, or may contain a fluorine atom.
- the method of forming the water-impermeable layer on at least the surface or inside of the flexible material is not particularly limited.
- the method for forming the water-impermeable layer is as follows. A method of attaching a non-permeable film to the front surface of a flexible film by preparing a non-permeable film as a flexible material, (mouth) A non-permeable film is provided as the non-permeable layer, and the non-permeable film is bonded between two flexible films. (C) contacting a flexible material with a solution prepared by dissolving the material used for the impermeable layer with an appropriate solvent before the solvent completely evaporates.
- a raw material monomer of the material used for the non-permeable layer is brought into contact with a flexible material in advance, and the appropriate material such as heat or light is applied to the flexible material.
- a method of forming a water-impermeable layer on at least the surface of at least the flexible material by giving the glue and polymerizing the raw material monomer. can give .
- the method (2) is adopted, if a hydrophobic flexible material and a hydrophobic monomer are used as the raw material monomer, the hydrophobic monomer can be used.
- Nomars may enter the microscopic gaps in the flexible material and fill the gaps, preventing ocular tissue from penetrating the flexible material after implantation.
- the flexible material may be subjected to surface treatment such as plasma treatment in advance, or the raw material monomer may be instantaneously applied to the flexible material. It is preferred that the polymer be brought into contact with the polymer and polymerized quickly.
- the thickness of the water-impermeable layer cannot be determined unequivocally because it differs depending on the material of the flexible material, etc., but usually sufficient water-impermeable property is required.
- the amount is preferably about 0.05 to 0.5 mm. 0
- the impermeable layer provided on the flexible material effectively prevents the outflow of aqueous humor and invasion of bacteria and the like, and reduces irritation to the eyelid conjunctiva.
- it is provided on the surface of the flexible material on the side in front of the obtained artificial cornea, particularly on the entire surface of the flexible material. It is preferred that it be broken.
- the non-permeable layer When the suture is performed, if the non-permeable layer is made of a flexible material, the non-permeable layer should be passed through a suture needle without leaving the non-permeable layer. You only have to suture. On the other hand, if the impermeable layer is made of a relatively hard material, the suture needle may not be able to pass through it, so healing of the wound after implanting the artificial cornea may be difficult. Therefore, it is small enough to prevent the invasion of bacteria and the outflow of aqueous humor after surgery. It is preferable that a hole is provided. Also, it is preferable that the hole is provided with an angle so as to follow the curve of the suture needle.
- the artificial cornea of the present invention when implanted, the artificial cornea protrudes radially outward from the support portion on the side facing the inner part of the eye when implanted. This is the one that was set up.
- the artificial cornea of the present invention by virtue of the presence of the brim, allows the corneal incision surface where the brim is a wound to be captured by the intraocular force. And the physical shape of the downloose (the invasion of the corneal tissue into the posterior surface of the corneal prosthesis due to the proliferation of cells from the corneal tissue) is physically blocked. , Prevent. As a result, it is possible to further prevent the floating and falling off of the artificial cornea, and the cells proliferated by down-growth can be further improved. The light does not reach the optical part, and the transparent part of the optical part is surely maintained.
- the material used for the collar part is harmless to humans, has passed safety, and can achieve the purpose of the present invention.
- the same materials as those used for the optical section, the support section, the water-impermeable layer, and the like can be used. .
- the collar portion protrudes radially outward from the support portion.
- the shape of the collar portion is excellent in safety and achieves the purpose of the present invention.
- the human cornea of the supporting portion when implanted, it extends radially over the entire circumference of the artificial cornea on the side facing the inner part of the eye.
- the compound is formed so that the effects of the present invention can be effectively exhibited.
- the effects of the present invention such as the prevention of the fall of the artificial cornea can be sufficiently exhibited.
- the collar preferably protrudes more than 0.5 mm radially outward from the support part, and consideration is given to ease of insertion into the inside of the eye. In this case, it is preferable that the projection is 2 mm or less, and it is usually preferable that the projection is about lmm.
- the thickness of the collar (in the direction of the optical axis of the eye) is determined in consideration of ease of insertion into the inside of the eye, spacing between the iris, and securing the volume of the anterior chamber. However, it is desirable that the thickness be less than lmm, preferably 0.1 to 0.5 mm, in order to avoid adversely affecting the eyes.
- the extreme pressure can be extremely high even at a normal intraocular pressure (about 20 mmHg) or a maximum of 50 mmHg. It is preferable that the material and the thickness are such that they have sufficient strength to prevent deformation. When viewed from the side of the strength of the applied force, the thickness of the hub portion is preferably at least 0.1 mm, for example. Better o
- FIG. 1 is a schematic cross-sectional view showing one embodiment when the artificial cornea of the present invention is implanted in corneal tissue.
- the artificial cornea 1 of the present invention comprises an optical part 2 having a front surface 2a and a rear surface 2b, and a support part 3, and the artificial cornea 1 is formed. Facing the inner part of the eye when implanted in corneal tissue 6
- the support portion 3 on the side (inside of the eye chamber) 7 is provided with a collar portion 4 protruding radially outward from the support portion 3, and the surface of the support portion 3 is further provided.
- (Outside the eye) 8 is provided with a water-impermeable layer 5 o
- the corneal incision wound surface 9 in which the brim portion 4 is a wound is located closer to the inner eye chamber 7 than the inner cornea 7.
- the optical section 2 The posterior surface is no longer covered. ⁇
- the transparent part of the optics 2 is reliably maintained, and the implanted artificial cornea 1 rises and falls off. There is no danger
- the lid part 4 is separate from the optical part r and the support part 3 (which is attached later), and is inside the eye chamber. 7, but in the present invention, the hub part 4 includes the optical part 2 and the Z or the support part.
- FIG. 2 shows an optical unit 2 and a support unit 3, and a hub unit 4 integrated with the optical unit 2 projects radially outward from the support unit 3.
- FIG. 2 is a schematic cross-sectional view showing one embodiment of the artificial cornea 1 of the present invention, which is provided with a non-permeable layer 5 on the surface of the support portion 3.
- FIG. 3 shows the optical unit 2 and the support unit 3.
- the collar unit 4 is separate from the optical unit 2 and the support unit 3, and the support unit 3 is provided on the side surface of the support unit 3.
- One embodiment of the artificial cornea 1 of the present invention which is provided so as to protrude radially outward from the lower end of the side surface of the support 3 and has a non-permeable layer 5 provided on the surface of the support portion 3 Schematic cut showing the mode It is a plan view.
- FIG. 4 shows that the optical part 2, the support part 3, and the force are formed, and the collar part 4 integrated with the support part 3 protrudes radially outward from the support part 3.
- FIG. 2 is a schematic cross-sectional view showing one embodiment of the artificial cornea 1 of the present invention provided with a non-permeable layer 5 on the surface of the support portion 3.
- FIG. 5 includes an optical unit 2 and a support unit 3, and a water-impermeable layer 5 integrated with the optical unit 2 is provided on the surface of the support unit 3, and furthermore, FIG. An annular collar 4 having an opening approximately the same as the diameter of the optical unit 2 in the center of the optical unit 2, and a part of the optical unit 2 protrudes from the opening.
- FIG. 3 is a schematic cross-sectional view showing one embodiment of the artificial cornea 1 of the present invention which is pulled out and protrudes radially outward from the support part 3 of the present invention.
- the artificial corneas 1 shown in the schematic cross-sectional views of FIGS. 1 to 5 are each provided with a curvature, but the artificial cornea of the present invention is limited to the presence or absence of the curvature. It is not something that will be done.
- the method for producing the artificial cornea of the present invention is not particularly limited, and various methods can be used.
- an optical part 2 for example, an optical part 2, a support part 3, a brim part 4, and a water-impermeable layer 5 are separately manufactured, respectively.
- the optical part 2 and the impermeable layer 5 are formed by, for example, injection molding, compression molding, roll molding, cast molding from a solution, or the like. You can use the body (sheet) and so on. Further, as described above, for example, a non-woven fabric, a soft foam, or the like can be used for the support portion 3. If an adhesive is used for the joining, the transparency of the optical section 2 is required. It is necessary to make sure that there is no loss.
- the optical part 2 and the brim part 4 are integrally formed, for example, and then the support part 3 and the like are formed.
- the non-permeable layer 5 and the non-permeable layer 5 can be joined by using, for example, an adhesive or the like as appropriate.
- the integral molding of the optical section 2 and the collar section 4 can be easily performed by using a mold having a desired shape, for example, by injection molding, compression molding, or the like. Can be obtained.
- the support 3 and the water-impermeable layer 5, and the bonding thereof are the same as those of the artificial cornea 1 shown in FIG. 1, for example. No.
- the brim section is made of the same material as the support section.
- a similar fine interstitial structure may be provided so as to be integral with the corneal tissue.
- the artificial cornea of the present invention thus obtained has the above-mentioned constitution, so that the artificial cornea is well fused with the eye tissue, and the aqueous humor in the eye flows out and does not contain bacteria. In addition to preventing any invasion into the eyes, it can also reduce irritation to the conjunctiva of the eyelids, and further inhibit the progress of downgrowth. There is no possibility that the transparency of the optics will be reduced due to down-growth, and there is no possibility that the optic will emerge from the buried state and fall off.
- the artificial cornea of the present invention is in contact with tears and aqueous humor in order to improve the compatibility with tears and aqueous humor and to provide at least good optical properties.
- a surface modification is applied to a portion to be removed, preferably to the entire surface.
- the method of applying surface modification to the artificial cornea of the present invention is not particularly limited.
- a method for applying acrylonitrile amide or hydroxyethyl methacrylate is available.
- Hydrophilic components such as creates (monomers) Is suitable for graft bonding (polymerization) to the surface of artificial cornea, hydrophilic polymer such as corona discharge treatment, plasma treatment, collagen, etc.
- the artificial cornea may be immersed in a solution dissolved in such a solvent, and then irradiated with a light beam to crosslink and modify the cornea.
- Example 1 Production of an artificial cornea having an impermeable layer formed on one surface (front surface) and a collar portion provided on the other surface (rear surface)]
- a 0.5 mm thick non-woven fabric made of poly (polyurethane) (basis weight: 50 g Zm 2 ) is a ring donut with an outer diameter of 7 mm and an inner diameter of 4 mm. I punched it with a trepan.
- the artificial cornea thus obtained is sterilized with ethylene oxide gas, and then implanted in rabbit eyes. did it . After that, the progress was observed. Even though 26 weeks had passed after implantation, the artificial cornea did not fall off, and there was no buoyancy. However, the optics of the corneal prosthesis remain transparent, as if they were tightly fused with the eye tissue, and the outflow of aqueous humor in the eye and infection in the eye were maintained. No inflammation such as illness was observed, and the condition was in good condition.
- Example 2 Production of an artificial cornea in which the optical part and the water-impermeable layer are integrated and the optical part penetrates from the center of the collar part
- An artificial cornea 1 having a shape (dimensions are as shown in FIG. 7) as shown in FIG. 5 was produced.
- a 10 mm diameter, 5 mm thick piece made of polyethylene terephthalate is cut and polished to make a 4 mm diameter, 1.3 mm thick transparent piece.
- a suture small hole having a diameter of 0.4 mm was appropriately provided at a position away from the optical part 2 of the non-permeable layer 5 (see FIG. Not shown).
- a 0.5 mm thick polyethylene terephthalate cloth is treaded into a ring donut shape with an outer diameter of 7.25 mm and an inner diameter of 4 mm. I punched.
- the piece made of polyethylene terephthalate is 0.3 mm in thickness (of the collar section 4) and has an outer diameter of 0.3 mm. It was cut and polished into a ring donut shape with a diameter of 9 mm and an inner diameter of 4 mm.
- the ring donor obtained in (2) The central opening of the support 3 was inserted. Then, from the direction where the support part 3 is fitted, the center opening of the ring-shaped donut-shaped collar part 4 obtained in (3) is inserted into the optical part 2. It fits along the outer circumference. A part of the optical part 2 (thickness: 0.3 mm) can be protruded from the central opening of the part. Further, the part where the optical part 2 and the collar part 4 were fitted together was welded by heat.
- the artificial cornea thus obtained was sterilized with ethylene oxide gas, and then implanted in a rabbit eye. It was easy to sew. After that, the progress was observed, but 13 weeks after the implantation, In addition, the corneal prosthesis is not only detached, but also has no buoyancy, and is firmly fused with the eye tissue, maintaining the transparency of the optical part of the prosthesis As it was, no inflammation such as outflow of aqueous humor in the eye and infection in the eye was observed, and a favorable condition was maintained.
- the artificial cornea of the present invention can be easily sutured to the eye tissue, and can be easily fixed to the eye tissue. Therefore, the artificial cornea is well fused with the eye tissue, and the aqueous humor in the eye can be obtained. It can prevent the outflow of bacteria and bacteria from entering the eye, reduce irritation to the eyelid conjunctiva, and further reduce It prevents the progress of the grounding, and the dangling may reduce the transparency of the optical part, and may cause the optical part to rise and fall from the implanted state.
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Transplantation (AREA)
- Ophthalmology & Optometry (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
- Materials For Medical Uses (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU48862/97A AU721065B2 (en) | 1996-11-13 | 1997-11-10 | Artificial cornea |
EP97911494A EP0891753A4 (en) | 1996-11-13 | 1997-11-10 | ARTIFICIAL CORNEA |
US09/101,279 US6391055B1 (en) | 1996-11-13 | 1997-11-10 | Artificial cornea |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8/301848 | 1996-11-13 | ||
JP30184896 | 1996-11-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998020813A1 true WO1998020813A1 (fr) | 1998-05-22 |
Family
ID=17901895
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/004076 WO1998020813A1 (fr) | 1996-11-13 | 1997-11-10 | Cornee artificielle |
Country Status (8)
Country | Link |
---|---|
US (1) | US6391055B1 (ja) |
EP (1) | EP0891753A4 (ja) |
KR (1) | KR19990077175A (ja) |
CN (1) | CN1208336A (ja) |
AU (1) | AU721065B2 (ja) |
ID (1) | ID21031A (ja) |
TW (1) | TW364843B (ja) |
WO (1) | WO1998020813A1 (ja) |
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WO2002039930A1 (fr) * | 2000-11-17 | 2002-05-23 | Menicon Co., Ltd. | Film a usage medical et procede de production de celui-ci, cornee artificielle faisant appel a ce film et procede de production de celle-ci |
US20200179100A1 (en) * | 2010-09-30 | 2020-06-11 | KeraMed, Inc. | Corneal Implants |
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KR20140113655A (ko) | 2011-11-21 | 2014-09-24 | 바이오미메디카, 인코포레이티드 | 정형외과적 임플란트를 뼈에 앵커링하기 위한 시스템, 장치, 및 방법 |
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US9974646B2 (en) | 2012-09-05 | 2018-05-22 | University Of Miami | Keratoprosthesis, and system and method of corneal repair using same |
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1997
- 1997-11-10 EP EP97911494A patent/EP0891753A4/en not_active Withdrawn
- 1997-11-10 CN CN97191687A patent/CN1208336A/zh active Pending
- 1997-11-10 US US09/101,279 patent/US6391055B1/en not_active Expired - Fee Related
- 1997-11-10 WO PCT/JP1997/004076 patent/WO1998020813A1/ja not_active Application Discontinuation
- 1997-11-10 ID IDW980042D patent/ID21031A/id unknown
- 1997-11-10 AU AU48862/97A patent/AU721065B2/en not_active Ceased
- 1997-11-10 KR KR1019980705315A patent/KR19990077175A/ko not_active Application Discontinuation
- 1997-11-11 TW TW086116873A patent/TW364843B/zh active
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JPH02104364A (ja) * | 1988-03-02 | 1990-04-17 | Minnesota Mining & Mfg Co <3M> | 角膜移植片およびその製法 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002039930A1 (fr) * | 2000-11-17 | 2002-05-23 | Menicon Co., Ltd. | Film a usage medical et procede de production de celui-ci, cornee artificielle faisant appel a ce film et procede de production de celle-ci |
US20200179100A1 (en) * | 2010-09-30 | 2020-06-11 | KeraMed, Inc. | Corneal Implants |
US11612477B2 (en) * | 2010-09-30 | 2023-03-28 | KeraMed, Inc. | Corneal implants |
Also Published As
Publication number | Publication date |
---|---|
US6391055B1 (en) | 2002-05-21 |
EP0891753A4 (en) | 1999-09-22 |
EP0891753A1 (en) | 1999-01-20 |
ID21031A (id) | 1999-04-08 |
AU4886297A (en) | 1998-06-03 |
KR19990077175A (ko) | 1999-10-25 |
CN1208336A (zh) | 1999-02-17 |
TW364843B (en) | 1999-07-21 |
AU721065B2 (en) | 2000-06-22 |
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