CN216772129U - A moulding device of cornea for correcting myopia - Google Patents
A moulding device of cornea for correcting myopia Download PDFInfo
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- CN216772129U CN216772129U CN202021202861.5U CN202021202861U CN216772129U CN 216772129 U CN216772129 U CN 216772129U CN 202021202861 U CN202021202861 U CN 202021202861U CN 216772129 U CN216772129 U CN 216772129U
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- correcting myopia
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Abstract
A corneal shaping device for correcting myopia includes a fixed portion and a shaping portion, wherein the fixed portion is permeable to oxygen and a crosslinking agent, wherein the shaping portion comprises an ultraviolet-permeable material having a base that forms a curved surface complementary to a desired shape of a cornea.
Description
Technical Field
The present invention relates to a device for correcting myopia, and more particularly to a corneal shaping device.
Background
China is a country with high incidence of myopia, the total number of people with myopia is more than 4 hundred million, the incidence of myopia in people over 5 years old is as high as 40 percent, the incidence of myopia is far higher than that in countries and areas in Europe and America at the same period, and the tendency of low age, high degree and high speed of progression is shown. The prevalence rate (myopia rate) of myopia of students in China is always high and is the second place of the world, and the prevalence rate of high myopia of the college students in China is even up to 90%.
At present, China has huge demand for myopia correction, and besides the glasses correction, the demand for myopia refractive correction surgery is increasing day by day. The surgical treatment modes for correcting myopia mainly comprise excimer laser keratotomy, excimer laser in-situ keratomileusis, intrastromal corneal ring implantation, and the femtosecond technology appearing in recent years. However, in all of the above-mentioned surgical methods, the cornea of the patient, which is originally normal in thickness, needs to be thinned, which corresponds to artificial damage to the normal cornea, and complications such as keratoectasia, corneal flap displacement, and dry eye may occur after the surgery. Especially for low myopia patients, the selection of a myopia correction mode is often a dilemma, if the lens wearing correction is selected, the frame glasses obviously influence the daily activities of the patients, and the corneal contact lenses increase the discomfort of the ocular surface, influence the metabolism of the cornea, increase the infection probability of the eyes and other problems; if the above-mentioned surgical treatment is selected, severe complications may be caused after the corneal ablation operation. In addition, the existing myopia treatment means and control means have limited indication range, some patients with thin cornea are difficult to perform corneal refractive surgery, and some children patients cannot tolerate the treatment of orthokeratology lens.
In recent years, corneal crosslinking has become a potential technique for correcting myopia. The technology has a long history and has been used for treating diseases such as keratoconus for a long time. It is performed by applying a corneal cross-linking agent, such as riboflavin, to the corneal surface and then irradiating with ultraviolet light. The fibers in the corneal stroma undergo a crosslinking reaction under the action of ultraviolet light and a crosslinking agent, become hard, can maintain the shape, and resist certain pressure and stress.
However, the current use of corneal crosslinking techniques to correct myopia is either only possible in patients with abnormal structures of the cornea (keratoconus) or is very limited with respect to diopter changes.
Therefore, the development of a safe and effective novel device for correcting myopia by applying the corneal crosslinking technology does not affect the life and vision quality of patients, avoids the problem of complications after the existing corneal surgery, and is a difficult problem to overcome urgently.
Disclosure of Invention
The cornea shaping device for correcting myopia can overcome the problems in the prior art, and after the cornea shape is shaped, the cornea keeps a desired shape for a period of time by using a cornea cross-linking technology.
In one aspect, the corneal shaping device for correcting myopia of the present invention comprises a fixed portion and a shaping portion, wherein the fixed portion is permeable to oxygen and a crosslinking agent, wherein the shaping portion comprises a material that is permeable to ultraviolet light, and a base portion of the shaping portion forms a curved surface complementary to a desired shape of the cornea.
The fixation portion may be fixed to or near the eyeball, head or head of the patient, allowing the shaping device to be positioned on the surface of the cornea, and limiting the range of motion of the corneal shaping device.
The shaping portion may use positive or negative pressure to change the shape of the cornea to a desired shape.
Drawings
FIG. 1 is a schematic view of an embodiment of a fixation section of a orthokeratology device of the present invention having fixation haptics for correcting myopia.
Figure 2a is a schematic view of another embodiment of the fixed portion of the orthokeratology device of the present invention having a suction ring configuration for correcting myopia.
Fig. 2b is a cross-sectional view of the embodiment of fig. 2 a.
Fig. 3 is a schematic view showing the fixed part of the cornea shaping device for correcting myopia according to the present invention attached to an eyelid retractor.
Fig. 4 is a schematic view showing that the fixing part of the orthokeratology device for correcting myopia of the present invention has a plate-like or sheet-like structure.
Figure 5 is a schematic view of one embodiment of the fixed portion of the orthokeratology device of the present invention having conduits for oxygen and cross-linking agents.
Fig. 6 is a schematic view of the orthokeratology device for correcting myopia of the present invention fixed near the head using a fixing bracket.
Figure 7a is a cross-sectional view of one embodiment of the shaping portion of the corneal shaping device for correcting myopia of the present invention wherein the top surface of the shaping portion is planar.
Fig. 7b corresponds to the embodiment of fig. 7a, wherein the shaping part is a complete view.
Fig. 8 is a schematic view of ultraviolet irradiation, in which the top surface of the shaping portion is a curved surface.
Detailed Description
The various components of the corneal shaping device for correcting myopia of the present invention are described in detail below.
Fixed part
The anchoring moiety is permeable to oxygen and the crosslinking agent. For example, the fixation part comprises a solid material that is permeable to oxygen, such as a silicon material or a polytetrafluoroethylene material. In addition, the anchoring portion may also have ducts or apertures for the passage of oxygen and the cross-linking agent.
The fixing mode of the fixing part comprises the following steps:
fixed on eyeball
The fixation portion may be a ring structure having 2 or more haptics on the outside. The fixation haptics may be sutured or clamped to the limbus or sclera of the patient (see fig. 1).
The anchoring portion may have a vacuum suction ring structure, the annular rim of which may be in contact with the cornea, limbus or corneal surface of the patient, and the suction ring structure may have a vacuum suction nozzle, the interior of which is a cavity (see fig. 2a, 2 b). After suction, a negative pressure occurs inside the ring structure of the anchoring portion, which sucks up the cornea, limbus or sclera.
The fixed part may be connected to the eyelid retractor, which is rigid or elastic (see figure 3). When the connection is elastic, it should generate an elastic force or stress directed toward the eyeball.
The fixation portion may have a plate-like or sheet-like structure that is supported to the conjunctival sac or conjunctival fornix. The plate-like or sheet-like structure extends into the conjunctival fornix of the patient and provides a fixed support force (see fig. 4).
Is fixed on the head
The anchoring portion may be secured to the head using a strap or helmet and the external anchoring structure of the shaping portion may be secured to the patient's cornea by a rigid or elastic brace.
Fixed near the head
The external fixation structure of the shaping portion may be rigidly or elastically connected to a slit lamp, an operating bed or the ground (not shown in the figures) using a fixation bracket (see fig. 6).
Moulding part
The shaping portion may be slidably connected to the fixing portion (see fig. 7a, 7 b). The sliding process can be controlled by the connecting means and the position between the two can be locked (not shown in the figures).
The shaping portion comprises a material transparent to ultraviolet light, such as quartz glass.
The shaping portion and the fixation portion may be air tight. When negative pressure is applied, negative pressure may be generated between the shaping portion and the cornea.
The base of the shaping portion forms a curved surface complementary to the desired topography of the cornea. For example, if it is desired to shape the anterior corneal surface into a spherical surface with a radius of curvature of 8.0mm, the bottom surface of the shaped portion may be shaped into a concave spherical surface with a radius of curvature of-8.0 mm.
The top surface of the shaping portion may be a flat surface, a curved surface with refractive effect, such as a spherical surface or an aspherical surface, or a combination of a plurality of optical lenses, such as a structure similar to a fish-eye lens, which can make the ultraviolet light irradiated to the cornea uniform or focus on a specific area.
Use for correcting myopia
The cornea shaping device can be used together with an ultraviolet irradiation device for correcting myopia.
When the cornea is irradiated by ultraviolet light, the plastic region can be uniformly irradiated by the diffused light, and other modes can also be used for irradiation.
The irradiation pattern may include:
multiple beam illumination
Multiple ultraviolet beams are directed to the same point or points within the corneal stroma, each individual beam having an intensity less than the threshold for initiating corneal crosslinking, but an intensity that is higher than the threshold required for corneal crosslinking when collected at the target points.
Crosslinking at a particular spatial location within the corneal stroma can be triggered, for example, by crosslinking deep within the corneal stroma, but not superficial.
Pattern projection illumination
When the ultraviolet light is irradiated on the cornea, a projection device may be used to project a specific pattern image on the surface or inside of the cornea. If projected into the interior of the cornea, a lens may be used to focus the graphical image into the interior of the corneal stroma.
Light field projection illumination
The 3-dimensional image may be projected into the corneal stroma using a light field projection technique, or a curved surface projection technique. This is equivalent to projecting dynamic pattern images from different angles onto the cornea using a combination of multi-beam illumination and pattern projection illumination.
From a single image, the light intensity of each pixel point is smaller than the threshold value for initiating corneal crosslinking, but the light intensity collected to the target point is higher than the threshold value required by corneal crosslinking. Crosslinking at a particular spatial location within the corneal stroma layer can be triggered.
Examples
The patient adopts a sitting or recumbent position, preferably a recumbent position. After conventional disinfection and surface anesthesia, the fixed part is fixed in front of the eye of the patient, the cross-linking agent is dripped on the surface of the cornea, and a period of time is waited to ensure that the cross-linking agent fully permeates into the corneal stroma layer.
The shaped portion is brought into contact with the patient's cornea. Pressurizing the shaping portion or pumping air into a cavity between the shaping portion and the cornea to bring the bottom surface of the shaping portion into close contact with the cornea and change the shape of the cornea until a desired shape is obtained.
And starting ultraviolet light to irradiate the cornea according to a preset program, so that the cornea is subjected to a crosslinking reaction. During the reaction, the vicinity of the cornea may be in a high oxygen environment or oxygen may be delivered to the surface and vicinity of the cornea through a tube within the fixation section.
In the shaping and ultraviolet irradiation processes, the cross-linking agent can be continuously dropped into the conjunctival sac.
After the cornea is crosslinked and remains in shape, the irradiation with ultraviolet light may be terminated.
Claims (9)
1. A corneal shaping device for correcting myopia comprising a fixed portion and a shaping portion, wherein the fixed portion is permeable to oxygen and a cross-linking agent, and wherein the shaping portion comprises a uv-transparent material having a base that forms a curve complementary to a desired shape of the cornea.
2. The orthokeratology device of claim 1, wherein the fixation portion comprises a solid material that is permeable to oxygen.
3. The orthokeratology device of claim 1, wherein the fixation portion has a channel or aperture for passage of oxygen and a cross-linking agent.
4. The orthokeratology device for correcting myopia according to any of claims 1-3, wherein the fixation portion is a ring-like structure with 2 or more haptics outside the ring-like structure.
5. The orthokeratology device of any of claims 1-3, wherein the fixation portion has a vacuum negative pressure suction ring structure having a vacuum nozzle with a cavity therein, and wherein the shaping portion and the fixation portion are air tight.
6. The orthokeratology device for correcting myopia according to any of claims 1-3, wherein the fixation portion is connected to the lid speculum.
7. The orthokeratology device for correcting myopia according to any one of claims 1-3, wherein the fixation portion has a plate-like or sheet-like structure supported to the conjunctival sac or the conjunctival fornix.
8. The corneal shaping device for correcting myopia according to any one of claims 1-3, wherein the shaping portion is slidably coupled to the fixed portion.
9. The corneal shaping device for correcting myopia according to any one of claims 1-3, wherein a top surface of the shaping portion is planar or curved.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021202861.5U CN216772129U (en) | 2020-06-24 | 2020-06-24 | A moulding device of cornea for correcting myopia |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021202861.5U CN216772129U (en) | 2020-06-24 | 2020-06-24 | A moulding device of cornea for correcting myopia |
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| CN216772129U true CN216772129U (en) | 2022-06-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114053022A (en) * | 2020-08-04 | 2022-02-18 | 首都医科大学附属北京同仁医院 | A moulding device of cornea for correcting myopia |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114053022A (en) * | 2020-08-04 | 2022-02-18 | 首都医科大学附属北京同仁医院 | A moulding device of cornea for correcting myopia |
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