CN106264787B - Artificial iris capable of fixing artificial lens and material and processing method thereof - Google Patents
Artificial iris capable of fixing artificial lens and material and processing method thereof Download PDFInfo
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Abstract
The invention provides an artificial iris capable of fixing an artificial lens, a material and a processing method thereof, wherein the artificial iris comprises an artificial iris diaphragm, a loop for fixing the artificial iris and a fixing structure for fixing the artificial lens, and the artificial iris can penetrate through a scleral wall and be flexibly fixed on the scleral wall by utilizing a protruding structure of the artificial iris, so that the operation of suture fixation is avoided. The artificial iris provided by the invention is also provided with a fixing structure for fixing the artificial lens, so that the artificial lens can be conveniently fixed on the iris for cataract patients with damaged capsular bag.
Description
Technical Field
The invention relates to the field of medical equipment, in particular to an artificial iris capable of fixing an artificial lens, a material and a processing method thereof.
Background
The iris belongs to the middle layer of the eyeball and is in front of the ciliary body, so that the iris can automatically adjust the size of the pupil and has the function of adjusting the amount of light entering the eye. As a biological soft tissue material, the iris has viscoelastic properties such as hysteresis, relaxation, creep, and strain rate dependence.
The important mechanical characteristics of the iris make the iris often have abnormal functions such as increase of spherical aberration and aberration, double vision, glare, photophobia, amblyopia, low vision after trauma and visual acuity reduction when no iris or iris defect is caused by eye trauma or congenital abnormality.
The atrophic iris can not be regenerated by means of medicines and the like at present, and can only be repaired by means of operations. Common surgical procedures are iris suturing and artificial iris implantation. The iris stitching is to use the elasticity of the remaining normal iris tissues of the patient to stretch and stitch the iris tissues together, thereby playing a certain role in controlling light and limiting aberration.
The best treatment is replacement with an artificial iris, which is implanted using synthetic materials to partially or fully replace the iris. However, at present, no synthetic material capable of completely replacing the iris exists, the iris diaphragm is arranged on the hard intraocular lens of the current product, the material is polymethyl methacrylate, a large operation incision is needed, the incision size is about 10mm, the implantation process is complex, and the operation effect and popularization are limited. An ideal artificial iris material should have properties similar to those of an iris, with viscoelastic properties such as hysteresis, relaxation, creep, strain rate dependence, etc.
Currently, the main ways of fixing artificial implants in the eye are the suture fixing way and the loop supporting way.
The suture fixing mode is that the artificial implant is fixed by the suture after the suture passes through the tissue, the space in the eye is limited, the suture overlapping in the eye is very difficult, the operation difficulty is high, and the operation effect is limited.
The method of supporting the haptics by holding the haptics against the ends of the closed space in a confined closed space is simple and convenient to operate, such as fixation in the capsular bag of an intraocular lens, but has a limitation in that the operation can be performed only in the closed space and is not suitable for fixation of an artificial iris in the anterior chamber angle, ciliary sulcus, or the like.
The existing artificial iris operation is usually fixed on the residual iris or the root of the iris or in the ciliary sulcus in a suture line mode, the mode needs complex suture and knotting operation in a narrow and closed space in eyes, the operation difficulty is high, and the operation development is limited. Numerous patients with iris defects are not effectively treated.
In addition, patients with iris damage due to lesions and trauma often have lens diseases or trauma, not only can cataract occur, but also can be accompanied by lens capsular bag lesions or injuries, and the fixing difficulty of the artificial lens is increased.
Therefore, there is a need for an iris prosthesis with an fixated intraocular lens and a material and method for manufacturing the same that solve the above-mentioned problems.
Disclosure of Invention
In order to overcome the defects of the prior art, the artificial iris, the material and the processing method thereof are provided, the artificial iris can penetrate through the scleral wall and can be flexibly fixed on the scleral wall by utilizing the self-convex structure of the artificial iris, thereby avoiding the operation of suture fixation and ensuring that the operation is simple and easy.
In particular, the present invention relates to the following aspects.
In a first aspect of the invention, an artificial iris capable of fixing an artificial lens is provided, which comprises an artificial iris diaphragm, a loop for fixing the artificial iris and a fixing structure for fixing the artificial lens, wherein the artificial iris diaphragm is a disc-shaped structure with a central hole in the center, the periphery of the loop is provided with a protruding structure which can penetrate through a scleral wall and be flexibly fixed on the scleral wall, and the back surface or the front surface of the artificial iris diaphragm is provided with the fixing structure for fixing the artificial lens, so that the artificial lens can be conveniently implanted into a patient with a damaged capsular bag.
In one embodiment of the invention, the diameter of the periphery of the artificial iris diaphragm is 9-13mm, the thickness of the artificial iris diaphragm is 0.3-0.7mm, the aperture of the central hole is 3-5mm, the artificial iris diaphragm is provided with 3-4 uniformly distributed small holes for the circulation of aqueous humor, and the diameter of the small holes is 0.15-0.25 mm.
Further, preferably, the artificial iris diaphragm has a peripheral diameter of 10-11mm, a thickness of 0.4-0.5mm, and a central hole diameter of 4 mm.
In one embodiment of the invention, the number of the haptics for fixing the artificial iris is 3-4, the length of the haptics is 4-6mm, the thickness is 0.3-0.5mm, the width is 0.8-1.2mm, and the top ends of the haptics are of an anti-slip 'letter' structure; each loop is provided with 2-3 bulges with different sizes, the length of the bulge is 0.6-1.0mm, the thickness is 0.3-0.5mm, and the width is 0.5-0.8 mm.
In one embodiment of the invention, the front surface of the artificial iris diaphragm is provided with an artificial lens fixing structure which is 2 circular arc bulges uniformly distributed, the inner diameter of the circular arc is 5-7mm, the length of the circular arc is 2-4mm, the height of the circular arc is 0.7-0.9mm, the width of the circular arc is 0.3-0.5mm, the circular arc is provided with a groove with the length of 0.5-0.8mm and the width of 0.2-0.4mm, and a loop for fixing the artificial iris can pass through the groove, so that the artificial lens is fixed.
In one embodiment of the invention, the front surface of the artificial iris diaphragm is provided with a fixing structure for fixing an artificial lens, the fixing structure is 3-4 circular arc bulges which are uniformly distributed, the inner diameter of the circular arc is 5-7mm and is just the diameter of the optical area of the artificial lens, the length of the circular arc is 3-5mm, the height of the circular arc is 0.7-0.9mm, the width of the circular arc is 0.3-0.5mm, and the top end of the circular arc is provided with a flanging with the thickness of 0.2mm and the width of 0.2mm, so that the artificial lens is prevented from falling off from the iris diaphragm.
In one embodiment of the invention, the back of the artificial iris diaphragm is provided with a fixing structure for fixing an artificial lens, the fixing structure is 3-4 circular arc bulges which are uniformly distributed, the inner diameter of the circular arc is 5-7mm and is just the diameter of the optical area of the artificial lens, the length of the circular arc is 3-5mm, the height of the circular arc is 0.7-0.9mm, the width of the circular arc is 0.3-0.5mm, and the top end of the circular arc is provided with a flanging with the thickness of 0.2mm and the width of 0.2mm, so that the artificial lens is prevented from falling off from the iris diaphragm.
In a second aspect of the invention, there is provided a synthetic material for use in processing an artificial iris, comprising:
a matrix polymer material;
silica gel color master batch;
wherein, the silica gel color master is uniformly dispersed in the matrix polymer material in a copolymerization or blending way, and the dosage of the silica gel color master is 0.5-2%.
In one embodiment of the present invention, the color of the silica gel color master batch includes, but is not limited to, black, blue, gray, green; the light transmittance of the material obtained by copolymerizing or blending the silica gel color master batch and the matrix polymer material is less than 0.2 percent within the wavelength range of 300-1100 nm.
In one embodiment of the present invention, the silica gel color masterbatch is black and is synthesized from a silica gel containing 20% to 35% black colorant and 65% to 80% black colorant, including but not limited to iron black, carbon black, sudan black.
In one embodiment of the present invention, the matrix polymer material includes, but is not limited to, silicone, polymethyl methacrylate, hydrophilic acrylate, hydrophobic acrylate biocompatible materials.
In a third aspect of the present invention, there is provided a method for processing an artificial iris, comprising the steps of:
firstly, mixing various components of medical-grade liquid silica gel in a certain proportion, then adding 0.5-2% of silica gel color master batch, stirring and mixing uniformly, and removing bubbles in vacuum; and then accurately injecting the product into a mold through a pressurizer, locking the mold, placing the mold in an environment with the temperature of 120-150 ℃ for heating and molding, taking out the mold after 30-50 minutes, opening the mold, taking out the product, and cleaning, drying and sterilizing the product to obtain the artificial iris.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the artificial iris can pass through the scleral wall and be flexibly fixed on the scleral wall by utilizing the self convex structure of the artificial iris, thereby avoiding the operation of suture fixation, having simple and easy operation, not only ensuring the iris to be stable in eyes, but also not needing suture fixation when being implanted, ensuring the iris to pass through a small incision easily due to the viscoelasticity of the artificial iris, and not causing damage. The artificial iris provided by the invention is also provided with a fixing structure for fixing the artificial lens, so that the artificial lens can be conveniently fixed on the iris for cataract patients with damaged capsular bag.
The features of the present invention will be apparent from the accompanying drawings and from the detailed description of the preferred embodiments which follows.
Drawings
FIG. 1 is a schematic front view of an artificial iris of the present invention using three haptics and two intraocular lens-securing grooves;
FIG. 2 is a schematic front view of an artificial iris of the present invention using four haptics and two grooves;
FIG. 3 is a schematic front view of an artificial iris of the present invention using four loops and four arcs with flanges;
FIG. 4 is a schematic front view of an artificial iris of the present invention using three loops and four arcs with flanges;
FIG. 5 is a schematic front view of an artificial iris of the present invention using three loops and three arcs with flanges;
FIG. 6 is a schematic front view of an artificial iris of the present invention using four haptics and three flanged arcs;
FIG. 7 is a schematic view of the back side of an artificial iris of the present invention using four haptics and three flanged arcs;
FIG. 8 is a schematic view of the back side of an artificial iris of the present invention using four haptics and four flanged arcs;
FIG. 9 is a schematic view of the back side of an artificial iris of the present invention using three haptics and four flanged arcs;
FIG. 10 is a schematic view of the back side of an artificial iris of the present invention using three loops and three arcs with flanges;
FIG. 11 is a partial cross-sectional view of an arc of the cuff of the present invention;
FIG. 12 is a graph showing the transmittance of the artificial iris of the present invention at 300-1100nm wavelength.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Referring to fig. 1 and 2, the present invention provides an artificial iris structure including an artificial iris diaphragm 1, a haptic 4 for fixing the artificial iris, and a circular arc or a boss 6 for fixing the artificial lens.
The artificial iris diaphragm 1 of the artificial iris is a completely opaque disc-shaped structure with a central hole 2 in the center, 3-4 small holes 3 are uniformly distributed on the artificial iris diaphragm 1 and are used for the circulation of aqueous humor, the peripheral diameter of the artificial iris diaphragm 1 is 9-13mm, the thickness of the artificial iris diaphragm is 0.3-0.7mm, and the aperture of the central hole 2 is 3-5 mm. The peripheral diameter of the preferred artificial iris diaphragm 1 is 10-11, the thickness is 0.4-0.5mm, and the aperture of the central hole 2 is 4 mm.
The artificial iris diaphragm 1 is provided with 3-4 evenly distributed small holes 3 for the circulation of aqueous humor, and the diameter of the small holes 3 is 0.15-0.25 mm. 3 small holes on the artificial iris diaphragm 1 are distributed at an interval of 120 degrees, or 4 small holes are distributed at an interval of 90 degrees, and the diameter of the small hole 3 is preferably 0.2 mm.
The number of the loop 4 for fixing the artificial iris is 3-4, the length of the loop 4 is 4-5mm, the thickness is 0.4-0.5mm, the width is 0.8-1.2mm, and the top end of the loop 4 is of an anti-slip 'letter' structure. Each loop is provided with 2-3 bulges 5 with different sizes, the length of each bulge 5 is 1-2mm, the thickness is 0.3-0.5mm, and the width is 0.6-1.0 mm. 1-3 bulges 5 can be selected to clamp the artificial iris at the sclera puncture hole, so as to achieve the purpose of fixing the artificial iris in the eye.
As shown in fig. 3 to 6, the artificial iris diaphragm 1 can be provided with 2 circular arc 6 bulges uniformly distributed on the front surface, the inner diameter of the circular arc 6 is 5-7mm, the length of the circular arc 6 is 2-4mm, the height of the circular arc 6 is 0.7-0.9mm, the width of the circular arc 6 is 0.3-0.5mm, a groove 8 with the length of 0.5-0.8mm and the height of 0.2-0.4mm is arranged on the circular arc 6, and a loop 4 of the artificial lens can pass through the groove 8, thereby fixing the artificial lens.
As shown in figure 11, the artificial iris diaphragm can also be provided with 3-4 circular arcs 6 uniformly distributed on the front surface, the inner diameter of the circular arc 6 is 5-7mm and is just equal to the diameter of the optical area of the artificial lens, the length of the circular arc 6 is 3-5mm, the height of the circular arc 6 is 0.7-0.9mm, the width of the circular arc 6 is 0.3-0.5mm, the top end of the circular arc 6 is provided with a flange 7 with the thickness of 0.2mm and the width of 0.2mm, so that the artificial lens is prevented from falling off from the iris diaphragm.
Referring to fig. 7 to 10, the artificial iris diaphragm 1 may also have 3 to 4 circular arcs 6 uniformly distributed on the back surface, the inner diameter of the circular arc 6 is 5 to 7mm, the size of the circular arc 6 is just equal to the optical zone diameter of the artificial lens, the length of the circular arc 6 is 3 to 5mm, the height of the circular arc 6 is 0.7 to 0.9mm, the width of the circular arc 6 is 0.3 to 0.5mm, the top end of the circular arc 6 is provided with a flange 7 with the thickness of 0.2mm and the width of 0.2mm, so as to prevent the artificial lens from falling off from the iris diaphragm.
The artificial iris manufactured by the material is basically opaque, can block most of external light, overcomes the phenomena of glare and photophobia and improves the visual acuity. The artificial iris made of the material has the light transmittance of less than 0.2 percent (see figure 12) in the wavelength range of 300-1100 nm.
The material of the artificial iris of the invention comprises silica gel color master batch, but not limited to silica gel, polymethyl methacrylate, hydrophilic acrylate and hydrophobic acrylate matrix polymer material.
The artificial iris of the invention is synthesized by adopting silica gel color master batch and matrix polymer material in a copolymerization or blending mode, has the relevant characteristics of hysteresis, relaxation, creep deformation, strain rate and the like of the human iris, and can play a role in blocking external light of the human iris. The artificial iris synthesized by the silica gel material has good strength, good toughness, softness and elasticity, can be implanted by adopting a small incision with the thickness of less than 2.2mm, and has convenient operation process, small postoperative risk and better operation effect than the iris diaphragm with the crystal which adopts polymethyl methacrylate.
The artificial iris of the invention adopts a compression molding mode, various components of liquid silica gel are firstly mixed according to a certain proportion, then 0.5-2% of silica gel color master is added, the mixture is stirred and mixed evenly, the vacuum pumping is carried out, the operation time is controlled within 4 hours, then the mixture is precisely injected into a mold through a pressurizer, after the mold is locked, the mold is placed in an environment with the temperature of 120 plus materials and 150 ℃ for heating and molding, the mold is taken out after 30-50 minutes, the mold is opened, the product is taken out, and the qualified product is obtained after cleaning, drying and sterilization.
The artificial iris processed by the method has the Shore hardness (Shore A) of 35-45, the elongation rate of more than 70%, the tear resistance strength of the loop of more than 0.4N/mm, and the tensile strength of the artificial iris diaphragm of more than 600 KPa.
When the artificial iris is implanted in an operation, the artificial iris is implanted into the anterior chamber through an implanter or implantation forceps, after the artificial iris is naturally unfolded, 25-gauge injection needles are used for respectively guiding the loop 4 to the outside of the sclera, one convex part is selected to be clamped at a puncture of the sclera according to the size of an eyeball due to the elastic retraction of the material of the loop 4, and the redundant loop 4 is trimmed and then embedded and fixed in the scleral lamina without additional suture fixation, so that the plane of the septum 1 of the artificial iris can be effectively consistent with the annular plane of the root part of the original iris. When the artificial lens is implanted subsequently, the artificial lens is implanted into the anterior chamber, then the artificial lens is shifted to the front of the artificial iris, one haptic 4 of the artificial lens penetrates through one groove 8 of the upper projection 5 part of the iris diaphragm, and then the other haptic 4 of the artificial lens penetrates through the other groove 8 of the upper projection 5 part of the iris diaphragm, thereby fixing the artificial lens on the iris diaphragm; or the artificial lens is implanted into the anterior chamber firstly, then the artificial lens is shifted to the front or the back of the artificial iris, the loop 4 is horizontally placed, the edge of the optical area of the artificial lens is placed in the circular arc 6 (or the L-shaped boss), and the artificial lens is clamped and fixed by the circular arc 6 (or the L-shaped boss) and the flanging 7. The artificial lens can also be fixed on the artificial iris diaphragm 1 by passing the loop 4 of the artificial lens through the empty groove on the circular arc 6 bulge on the artificial iris diaphragm 1, thereby completing the operation.
Example 1:
proportioning: the silica gel color master batch comprises 35 percent of iron oxide black and 65 percent of silica gel, the proportion of the components of silica gel MED6820 (A, B) is weighed according to the ratio of 1:1, then the silica gel color master batch with the amount of 0.5 percent of the color master batch is added, the mixture is uniformly mixed, degassing and foaming are carried out for 10 minutes under the vacuum degree of minus 0.1MPa, then the mixed silica gel is injected into a mold through a pressurizer, the mold is placed in an oven at the temperature of 140 ℃, and the silica gel is taken out after 30 minutes. The diameter of the processed artificial iris diaphragm 1 is 12mm, the thickness is 0.5mm, the diameter of the central hole 2 is 4mm, and the number of the loops 4 is 3.
The light transmittance under the wavelength of 300-1100nm is less than or equal to 0.03 percent through testing. The Shore hardness (Shore A) is 45, the elongation is 82.2%, the tear resistance of the loop 4 is 0.55N/mm, and the tensile strength of the artificial iris diaphragm is 650 KPa.
Example 2:
proportioning: the silica gel color master batch comprises 20 percent of carbon black and 80 percent of silica gel: weighing the components of the silica gel MED6820 (A, B) according to the ratio of 1:1, adding silica gel color masterbatch with the amount of 2.0 percent of the color masterbatch, uniformly mixing, degassing for 10 minutes under the vacuum degree of-0.1 MPa, injecting the mixed silica gel into a mold through a pressurizer, putting the mold into an oven at the temperature of 140 ℃, and taking out after 40 minutes. The diameter of the processed artificial iris diaphragm 1 is 11mm, the thickness is 0.40mm, the diameter of the central hole 2 is 3.5mm, and the number of the loops 4 is 3.
The light transmittance at the wavelength of 300-1100nm is less than or equal to 0.03 percent through testing, the Shore hardness (Shore A) is 40, the elongation is 91.5 percent, the tear resistance of the loop 4 is 0.51N/mm, and the tensile strength of the artificial iris diaphragm is 632 KPa.
Example 3:
proportioning: the silica gel color master batch comprises 35 percent of iron oxide black and 65 percent of silica gel, the proportion of the components of silica gel MED6820 (A, B) is weighed according to the ratio of 1:1, then the silica gel color master batch with the amount of 1.0 percent of the color master batch is added, the mixture is uniformly mixed, degassing and foaming are carried out for 10 minutes under the vacuum degree of minus 0.1MPa, then the mixed silica gel is injected into a mold through a pressurizer, the mold is placed in an oven at the temperature of 150 ℃, and the silica gel is taken out after 30 minutes. The diameter of the processed artificial iris diaphragm 1 is 12mm, the thickness is 0.40mm, the diameter of the central hole 2 is 4.5mm, and the number of the loops 4 is 3.
The light transmittance at the wavelength of 300-1100nm is less than or equal to 0.03 percent through testing. The Shore hardness (Shore A) is 37, the elongation is 94.3%, the tear resistance of the loop 4 is 0.45N/mm, and the tensile strength of the artificial iris diaphragm is 620 KPa.
Example 4:
proportioning: silica gel color masterbatch containing 25% of iron oxide black and 75% of silica gel, silica gel MED6820 (A, B) component proportion is weighed according to 1:1, then silica gel color masterbatch with the amount of 1.5% of the color masterbatch is added, the mixture is uniformly mixed, degassing and foaming are carried out for 10 minutes under the vacuum degree of minus 0.1MPa, then the mixed silica gel is injected into a mold through a pressurizer, the mold is placed into a baking oven with the temperature of 120 ℃, and the silica gel is taken out after 50 minutes. The diameter of the processed artificial iris diaphragm 1 is 10mm, the thickness is 0.40mm, the diameter of the central hole 2 is 4.0mm, and the number of the loops 4 is 4.
The light transmittance at the wavelength of 300-1100nm is less than or equal to 0.02 percent through testing. The Shore hardness (Shore A) is 35, the elongation is 91.2%, the tear resistance of the loop 4 is 0.42N/mm, and the tensile strength of the artificial iris diaphragm is 602 KPa.
Example 5:
taking 65g of dimethyl (siloxane and polysiloxane) (cas: 63148-62-9) in a 250ml container, accurately weighing 35g of nano iron black powder, stirring strongly for 0.5 hour, performing ultrasonic treatment for 0.5 hour to fully disperse the nano iron black, and performing vacuum defoaming on the dispersion system to obtain the black silica gel color master batch.
The artificial iris with different tensile strengths is obtained through different material proportions, processing time and temperatures.
The artificial iris of the invention can pass through the scleral wall and be flexibly fixed on the scleral wall by utilizing the self convex structure of the artificial iris, thereby avoiding the operation of suture fixation, the operation is simple and easy, the iris is kept stable in eyes, the fixation of the suture is not needed when the iris is implanted, the iris can easily pass through a small incision due to the viscoelasticity of the iris, and the iris can not be damaged. The artificial iris provided by the invention is also provided with the bulge structure for fixing the artificial lens, so that the artificial lens can be conveniently fixed on the iris for cataract patients with damaged capsular bag.
Claims (7)
1. The utility model provides a can fix artificial iris of intraocular lens which characterized in that, it includes that artificial iris separates, fixes the artificial iris and uses the loop and fix the circular arc arch of intraocular lens, the artificial iris separates to have the discoid structure of central hole for the center, the loop has protruding structure all around, can pass the scleral wall and fix on the scleral wall in a flexible way to avoid the operation of suture fixation, the circular arc arch sets up on the back or the front that the artificial iris separates, make things convenient for the impaired patient of capsular bag to implant intraocular lens, wherein, there is a groove on the circular arc arch, and intraocular lens's loop can be followed pass in the protruding groove of circular arc, thereby fix intraocular lens.
2. The artificial iris of claim 1 wherein the artificial iris diaphragm has a peripheral diameter of 9-13mm, a thickness of 0.3-0.7mm, and a central aperture of 3-5mm, and has 3-4 evenly distributed apertures for the passage of aqueous humor, the apertures having a diameter of 0.15-0.25 mm.
3. The artificial iris of claim 2 wherein the artificial iris diaphragm has a peripheral diameter of 10-11mm, a thickness of 0.4-0.5mm and a central aperture of 4 mm.
4. The artificial iris of claim 1 wherein the number of the haptics for fixing the artificial iris is 3-4, the length of the haptics is 4-6mm, the thickness is 0.3-0.5mm, the width is 0.8-1.2mm, and the top ends of the haptics are of a slip-proof 'letter' structure; each loop is provided with 2-3 bulges with different sizes, the length of the bulge is 0.6-1.0mm, the thickness is 0.3-0.5mm, and the width is 0.5-0.8 mm.
5. The artificial iris of claim 1 wherein the artificial iris diaphragm has 2 evenly distributed circular protrusions on the front surface, the inner diameter of the circular protrusions is 5-7mm, the length of the circular protrusions is 2-4mm, the height of the circular protrusions is 0.7-0.9mm, and the width of the circular protrusions is 0.3-0.5 mm.
6. The artificial iris of claim 1 wherein the front surface of the iris diaphragm is provided with 3-4 circular protrusions distributed uniformly, the inner diameter of the circular protrusions is 5-7mm, the size of the circular protrusions is just equal to the optical zone diameter of the artificial lens, the length of the circular protrusions is 3-5mm, the height of the circular protrusions is 0.7-0.9mm, the width of the circular protrusions is 0.3-0.5mm, and the top ends of the circular protrusions are provided with flanges with the thickness of 0.2mm and the width of 0.2mm to prevent the artificial lens from falling off the iris diaphragm.
7. The artificial iris of claim 1 wherein the back of the iris diaphragm is provided with 3-4 circular protrusions distributed uniformly, the inner diameter of the circular protrusions is 5-7mm, the size of the circular protrusions is just equal to the optical zone diameter of the artificial lens, the length of the circular protrusions is 3-5mm, the height of the circular protrusions is 0.7-0.9mm, the width of the circular protrusions is 0.3-0.5mm, and the top ends of the circular protrusions are provided with flanges with the thickness of 0.2mm and the width of 0.2mm to prevent the artificial lens from falling off the iris diaphragm.
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| CN110859686A (en) * | 2019-09-11 | 2020-03-06 | 易虹 | Method for designing an intraocular lens for providing vision correction to a patient due to AMD loss of vision and positioning mechanism for an intraocular lens |
| CN111467077B (en) * | 2020-04-20 | 2022-02-15 | 西安眼得乐医疗科技有限公司 | Comprehensive artificial lens implant for congenital cataract |
| CN111481322B (en) * | 2020-04-20 | 2022-02-15 | 西安眼得乐医疗科技有限公司 | Adjustable bag inner ring |
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| CN106264787A (en) | 2017-01-04 |
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