An artificial cornea

Abstract

The present invention relates to an artificial cornea, comprising a cornea body, an inner support ring, several stress wires and an outer support ring; the cornea body is provided with a sclera at the periphery, the outer support ring is provided at the periphery of the sclera, and the inner circumference of the outer support ring is preset in the outer ring layer of the sclera, the cornea body is provided with an inner support ring in the middle, and the middle of the inner support ring is a central optical part; the inner end of the stress wire is connected to the outer edge of the inner support ring, radially extends outward, and is buried in the outer layer of the cornea body, and finally passes through the interlayer of the sclera and its outer end is connected to the inner circle of the outer support ring. The artificial cornea of ​​this case uses prestress to share the intraocular pressure of the central optical part of the artificial cornea to the broad corneal limbal tissue, so as to avoid the local artificial cornea from compressing the original corneal tissue under long-term pressure, thereby enhancing the stability of the artificial cornea in the eye.

Description

Technical Field

[0001] The invention relates to the field of medical ophthalmic equipment, and in particular to an artificial cornea. Background Art

[0002] Currently, more than 10 million people in the world are blind due to corneal diseases, which is the second leading cause of blindness, second only to cataracts. 80% of them can be cured through corneal transplantation. However, traditional corneal transplantation has two major drawbacks: one is the difficulty in obtaining corneal donors, and the other is the low success rate of the operation. The emergence and application of artificial corneas have brought hope to patients with corneal blindness.

[0003] Artificial cornea is a product made of medical polymer materials that is similar to the human cornea. When replacing the original corneal tissue, the current permanent artificial cornea is subjected to a large intraocular pressure. This pressure is mainly borne by a pre-set ring-shaped, perforated ring-shaped or disc with tissue engineering materials buried between the inner layers of the cornea. Some also add a ring on the inner side of the cornea to increase the area that resists this pressure. However, it is inevitable that under long-term pressure, the tissue strength will be slowly weakened, the tissue shape will be changed, and finally cracks will appear between the artificial material and the original cornea, which will cause the fluid in the eye to flow out, and even bacteria outside the eye may enter, leading to the failure of the operation.

[0004] In view of this, the inventor conducted in-depth research on the above-mentioned defects in the prior art, and thus came up with this case. Summary of the invention

[0005] In order to solve the above technical problems, we proposed an artificial cornea, which uses prestress to share the intraocular pressure of the central optical part of the artificial cornea to the broad tissue of the corneal margin, avoiding the local artificial cornea from compressing the original corneal tissue under long-term pressure, thereby enhancing the stability of the artificial cornea in the eye.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] An artificial cornea comprises a cornea body, an inner support ring, a plurality of stress wires and an outer support ring; a sclera is arranged on the periphery of the cornea body, the outer support ring is arranged on the periphery of the sclera, and the inner circumference of the outer support ring is preset in the outer ring layer of the sclera, an inner support ring is arranged in the middle of the cornea body, and the middle of the inner support ring is a central optical part; the inner end of the stress wire is connected to the outer edge of the inner support ring, extends radially outward, and is buried in the outer layer of the cornea body, and finally passes through the layer of the sclera and its outer end is connected to the inner circle of the outer support ring; the stress wires are evenly distributed between the outer edge of the inner support ring and the inner circle of the outer support ring; the stress wires are made of transparent material with prestress and biocompatibility; the cornea body, inner support ring and outer support ring of the artificial cornea are formed of transparent material with biocompatibility.

[0008] An outer support ring is preset outside the cornea body and between the sclera layers, and is connected to the inner support ring through radial stress wires. The stress wires are also buried between the layers of the original cornea body, and there is tension between the stress wires, the cornea body and the outer support ring. When this tension is applied to a spherical object such as an eyeball, it can pre-provide a force to pull the artificial cornea toward the center of the eyeball, and this force just balances the outward force of the intraocular pressure on the artificial cornea, so that the artificial cornea is almost unaffected by the intraocular pressure, and all the pressure is borne by the outer support ring between the sclera layers preset outside the corneal edge.

[0009] Preferably, a circle of through holes is provided in the center of the inner support ring, and the through holes are watertightly connected to the central optical part through threads. The through holes on the inner support ring are evenly distributed, and there is a spacing between adjacent through holes.

[0010] According to the above technical solution, the present invention arranges the sclera on the periphery of the corneal body, the outer support ring is arranged on the periphery of the sclera, and the inner circumference of the outer support ring is preset in the outer ring layer of the sclera, the middle of the corneal body is provided with an inner support ring, and the middle of the inner support ring is the central optical part; the inner end of the stress wire is connected to the outer edge of the inner support ring, extends radially outward, and is buried in the outer layer of the corneal body, and finally passes through the layer of the sclera and its outer end is connected to the inner circle of the outer support ring;

[0011] An outer support ring is preset outside the cornea body and between the sclera layers, and is connected to the inner support ring through radial stress wires. The stress wires are also buried between the layers of the original cornea body, and there is tension between the stress wires, the cornea body and the outer support ring; this tension can be suitable for spherical objects such as eyeballs, especially when used on spherical objects such as eyeballs, it can pre-provide a force to pull the artificial cornea toward the center of the eyeball, and this force just balances the outward force of the intraocular pressure on the artificial cornea, so that the artificial cornea is almost unaffected by the intraocular pressure. All the pressure is borne by the outer support ring preset between the sclera layers outside the cornea. This outer support ring has a large circumference and can withstand a large tension between the sclera layers. Even if it takes a long time, it will not cause obvious displacement. Even if there is a small amount of displacement, it will not affect the effect of the operation. Thus, the purpose of novel design, reasonable structure and good application effect is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 The figure is a schematic diagram of the structure of an artificial cornea disclosed in an embodiment of the present invention.

[0014] The numbers and letters in the figure represent the corresponding component names:

[0015] 1. Corneal body 2. Inner support ring 3. Stress wire 4. Outer support ring 5. Sclera 6. Corneal limbus 7. Central optical part 8. Penetration hole DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The present invention is further described in detail below with reference to examples and specific implementation modes.

[0018] Example

[0019] like Figure 1As shown, an artificial cornea comprises a cornea body 1, an inner support ring 2, a plurality of stress wires 3 and an outer support ring 4; a sclera 5 is arranged on the periphery of the cornea body 1, the outer support ring 4 is arranged on the periphery of the sclera 5, and the inner circumference of the outer support ring 4 is preset in the outer ring layer of the sclera 5, an inner support ring 2 is arranged in the middle of the cornea body 1, and the middle of the inner support ring 2 is a central optical part 7; the inner end of the stress wire 3 is connected to the outer edge of the inner support ring 2, extends outward radially, and is buried in the outer layer of the cornea body 1, and finally passes through the layer of the sclera 5 and its outer end is connected to the inner circle of the outer support ring 4;

[0020] Since an outer support ring 4 is preset on the outside of the cornea body 1 and between the layers of the sclera 5, and is connected to the inner support ring 2 through radial stress wires 3, the stress wires 3 are also buried between the layers of the original cornea body 1, and there is already tension between the stress wires 3, the cornea body 1 and the outer support ring 4; when this tension is used on a spherical object such as an eyeball, it can pre-provide a force to pull the artificial cornea toward the center of the eyeball, and this force just balances the outward force of the intraocular pressure on the artificial cornea, so that the artificial cornea is almost unaffected by the intraocular pressure, and all the pressure is borne by the outer support ring 4 preset between the layers of the sclera 5 outside the corneal margin 6.

[0021] At the same time, a circle of penetration holes 8 is provided in the center of the inner support ring 2, and the holes of the penetration holes 8 are watertightly connected to the central optical part 7 through threads. The stress wires 3 are evenly distributed between the outer edge of the inner support ring 2 and the inner circle of the outer support ring 4. The penetration holes 8 on the inner support ring 2 are evenly distributed, and there is a spacing between adjacent penetration holes 8. The stress wires 3 are made of a transparent material with prestress and biocompatibility. The corneal body 1, the inner support ring 2 and the outer support ring 4 of the artificial cornea are formed of a transparent material with biocompatibility.

[0022] In this example, the artificial cornea is provided with a sclera 5 on the periphery of the corneal body 1, the outer support ring 4 is provided on the periphery of the sclera 5, and the inner circumference of the outer support ring 4 is preset in the outer ring layer of the sclera 5, the middle of the corneal body 1 is provided with an inner support ring 2, and the middle of the inner support ring 2 is a central optical part 7; the inner end of the stress wire 3 is connected to the outer edge of the inner support ring 2, extends radially outward, and is buried in the outer layer of the corneal body 1, and finally passes through the layer of the sclera 5 and its outer end is connected to the inner circle of the outer support ring 4;

[0023] An outer support ring 4 is preset outside the corneal body 1 and between the sclera 5 layers, and is connected to the inner support ring 2 through radial stress wires 3. The stress wires 3 are also buried between the layers of the original corneal body 1, and there is tension between the stress wires 3 and the corneal body 1 and the outer support ring 4; this tension can be suitable for spherical objects such as eyeballs, especially when used on spherical objects such as eyeballs, it can pre-provide a force to pull the artificial cornea toward the center of the eyeball, and this force just balances the outward force of the intraocular pressure on the artificial cornea, so that the artificial cornea is almost unaffected by the intraocular pressure. All the pressure is borne by the outer support ring 4 between the sclera 5 layers preset outside the corneal margin 6. This outer support ring 4 has a large circumference and can withstand a large tension between the sclera 5 layers. Even if it takes a long time, it will not cause obvious displacement. Even if there is a small amount of displacement, it will not affect the effect of the operation. Thus, the purpose of novel design, reasonable structure and good application effect is achieved.

[0024] The above is only a preferred embodiment of the artificial cornea of ​​the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the creative concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. An artificial cornea, characterized in that: It comprises a cornea body, an inner support ring, several stress wires and an outer support ring; a sclera is arranged on the periphery of the cornea body, an outer support ring is arranged on the periphery of the sclera, and the inner circumference of the outer support ring is preset in the outer ring layer of the sclera, an inner support ring is arranged in the middle of the cornea body, and the middle of the inner support ring is a central optical part; the inner end of the stress wire is connected to the outer edge of the inner support ring, extends radially outward, and is buried in the outer layer of the cornea body, and finally passes through the layer of the sclera and its outer end is connected to the inner circle of the outer support ring; the stress wires are evenly distributed between the outer edge of the inner support ring and the inner circle of the outer support ring; the stress wires are made of transparent material with prestress and biocompatibility; the cornea body, inner support ring and outer support ring of the artificial cornea are formed of transparent material with biocompatibility.

2. An artificial cornea according to claim 1, characterized in that: A circle of through holes is provided in the center of the inner support ring, and the through holes are watertightly connected to the central optical part through threads; the through holes on the inner support ring are evenly distributed, and there is a spacing between adjacent through holes.

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