KR102469239B1 - Manufacturing method for contact lens having lacrimal damping holes and thereof - Google Patents

Abstract

The present invention relates to a method for manufacturing a contact lens having a tear damping hole. In the contact lens having a tear damping hole according to the manufacturing method of the present invention, a plurality of through holes spaced apart from each other by a certain distance are located in the fitting part outside the optical part. However, each of the plurality of through holes is formed as a lachrymal damping hole having an opening at the top and an indentation at the bottom, so that the slight contraction of the outer periphery due to the tension of the eyelid when closing the eye due to blinking and the tear fluid by restoration when opening the eye By enabling smooth inflow and outflow, it gives a good feeling of wearing, has the advantage of less dryness, less hula phenomenon, and less light bleeding, and optionally forms a single tear circulation path and damping holes there By installing the tear circulation effect can be further enhanced.

Description

Manufacturing method of contact lens having tear damping hole {MANUFACTURING METHOD FOR CONTACT LENS HAVING LACRIMAL DAMPING HOLES AND THEREOF}

The present invention relates to a method for manufacturing a contact lens having a tear damping hole, and more particularly, a plurality of tear damping holes spaced apart from each other at a certain distance from each other on the outside adjacent to the optical part, and the tear damping hole is is curved, and the upper part has a linear or curved plucking structure, so when blinking, the outer periphery of the eyelids (eyelid) contracts finely due to the tension (lung eye) and tear fluid due to restoration (open eye) It relates to a method for manufacturing a contact lens having a tear damping hole that provides a good feeling of wearing by enabling smooth inflow and discharge of the contact lens, less dryness, less hula effect, and less light blurring.

Contact lenses are lenses that are worn on the corneal surface of the eye and are used for vision correction to correct refractive errors such as myopia, astigmatism, and farsightedness, for treatment to promote regeneration of damaged corneas and to relieve pain, and to change the color of the pupil. It is widely used for cosmetic purposes to change or make pupils look clear and large, and for replacement of glasses during sports activities.

For a contact lens attached to the cornea with a tear layer (tear layer) in between, tension due to capillary action uniformly and radially acts on the edge of the contact lens to attach the contact lens to the cornea, and balances with the impact caused by blinking. When the contact lens in the state is out of the equilibrium position, a change occurs in the gap of the lacrimal fluid layer, and a restoring force is generated in the lens according to the tension caused by the non-uniform capillary action due to this change.

Contact lenses are affected by various parameters such as the frictional force between the eyelid and the lens according to blinking, the force caused by the acceleration of the eyelid, the thickness and resilience of the tear layer, the viscous resistance, the blinking period, the BC (base curve) of the lens, and the lens diameter. Its equilibrium and translational and restoring motions are determined.

The cornea, which is the outermost part of the eye, is an avascular tissue, so it does not receive oxygen from the blood, but only receives oxygen from the air through diffusion, and the contact lens has fine holes to allow the delivery of dissolved oxygen in the tear fluid.

Contact lens materials such as HEMA (2-hydroxy-ethyl methacrylate) widely used on the market deliver oxygen through the diffusion of tear fluid, so the higher the water content, the higher the oxygen permeability, and the softer the lens, the better the fit and the softer the lens. In order to maintain the shape, the center thickness becomes relatively thick and the adhesion of internal substances such as proteins and fats becomes severe, whereas materials such as silicone hydrogel, which have oxygen transmission ability, generally have a high water content at a low moisture content. It shows oxygen permeability, and if the water content is too high, it can absorb too much tear fluid and cause dryness.

On the other hand, if the oxygen supply to the cornea is reduced due to severe adhesion of the contact lens to the eye or prolonged continuous wearing, etc., hypoxia is induced in the cornea, and corneal edema, corneal epithelial damage, corneal neovascularization, ulcerative keratitis, corneal infiltration There is a risk of causing diseases such as

In addition, since the contact lens has a certain water content, it can absorb tear fluid and cause a lack of tear fluid, so if the contact lens is worn continuously for a long time, there is a risk of causing eye dryness and congestion.

Therefore, supply of fresh lacrimal fluid to the lacrimal fluid layer between the contact lens and the cornea is a very important problem in contact lenses.

Typical conventional known technologies in this regard include the following.

U.S. Patent Publication No. 6,010,219 A (published on Jan. 4, 2000) consists of a central part, a tear storage part, and a peripheral part, and penetrates the tear storage part for the purpose of preventing corneal edema and lens adhesion by reducing the tear fluid pressure formed in the tear storage part. Disclosed is a ball-shaped contact lens for correcting corneal refraction.

However, this prior art has a problem that when the tear storage portion is located on the outer periphery of the lens and a through hole is formed therein, the negative pressure adsorption force is lowered, reducing the effect of correcting myopia and causing the hula phenomenon.

Korean Patent Registration No. 10-08881725 (registered on January 28, 2009) discloses a contact lens including a tear circuit and a through hole forming a concave surface so that tears are stored and circulated along the circumferential direction of the inner surface made of a curved surface to contact the cornea. In the above, the tear circulation path forming the concave surface is formed to overlap the end of the iris, and has a width of 0.8 mm to 1 mm toward the center of the contact lens, and a constant width and a convex surface in the center of the circumferential direction of the tear circulation path. It is divided into two or more parts in the direction of the cornea to form a tear circulation space and a protruding corneal contact portion is formed, and the tear circulation path is formed to enhance the osmotic function formed by the through hole formed in the tear circulation space. are doing

Korean Patent Registration No. 10-1978909 (registered on May 14, 2019) is a contact lens comprising an inner surface formed in a curved surface to contact the cornea and an outer surface that does not contact the cornea, and tears are stored in the circumferential direction of the inner surface and a tear circulation unit formed to circulate; at least one inlet provided in the tear circulation unit and passing through the inner surface and the outer surface to allow tears to flow into the tear circulation unit; And a discharge part formed on the inner surface and connected to the tear circulation part to discharge tears in the tear circulation part to the outside of the contact lens, wherein the tear circulation part is formed as a groove along the circumferential direction from the inner surface at least. A jig capable of manufacturing a contact lens is proposed, including one tear circulation path, so that tears can be smoothly supplied and discharged to the cornea.

On the other hand, Korean Patent Registration No. 10-2061813 (registered on December 26, 2019) is a contact lens formed in a curved surface and including an inner surface in contact with the cornea and an outer surface not in contact with the cornea, along the circumferential direction of the inner surface. At least one tear circuit formed in a ring shape and through which tears are supplied and circulated along the path; It is formed on the inner surface and includes at least one discharge groove for transporting tears and discharging them to the outside in communication with the tear circulation passage, wherein the tear circulation passage or discharge groove contracts when closed eyes and restores the outer surface of the lens by restoring tears when opening eyes. At least one suction hole is formed to introduce the generated tears, the discharge groove is formed so as not to open the inner surface, and a discharge hole through which tears are discharged is formed on one side to propose a contact lens having a suction function have.

However, all of the prior art has a structure in which at least two mutually communicated cylindrical tear circuits are formed with a through hole or a suction hole and an inlet hole, and these through holes or suction holes and inlet holes have the same diameter at the upper and lower parts and in the center. It is formed in a cylindrical shape with a suction hole and an inlet hole, or the bottom edge of the tear circuit where the suction hole and the inlet hole are formed is formed sharply, so that much more sensory nerves are distributed than the fingertips when wearing contact lenses, stimulating the very sensitive surface of the cornea, causing a foreign body sensation. In addition to the problem of causing inflammation, the through hole or the upper part of the suction hole and inlet hole is formed without chamfering, so the inflow and discharge of tear fluid by contraction and restoration due to the tension of the eyelid during blinking is not sufficiently satisfactory. has a problem.

US Patent Publication No. 6,010,219 A (published on January 4, 2000) Korean Registered Patent Publication No. 10-08881725 (registered on January 28, 2009) Korean Registered Patent Publication No. 10-1978909 (registered on May 14, 2019) Korean Registered Patent Publication No. 10-2061813 (registered on December 26, 2019)

An object of the present invention is to provide a good feeling of wearing by enabling smooth inflow and discharge of tear fluid due to fine contraction of the outer periphery (when closing eyes) and restoration (when opening eyes) of the outer periphery due to the tension of the eyelid during blinking, thereby imparting a good feeling of wearing and less dryness. , Less hula phenomenon, less light bleeding, selectively forming a single tear circulation path and installing a damping hole therein to provide an effective method for manufacturing a contact lens having a tear damping hole that enhances the tear circulation effect. It is to do.

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The above object of the present invention is, (A) a male mold having three penetrating pins formed in a concave round portion with a lower portion of R = 2 to 3 mm in order to mold a contact lens formed of a curved surface and having a through hole so as to contact the cornea, and the through hole molding a contact lens by injecting and curing a resin monomer for molding a contact lens between a female mold having an annular groove accommodating a pin; (B) the female mold is released from the male mold, and while the contact lens is manually processed in a state where the molded contact lens is fixed to the male mold having the through pin, the upper part of the through hole is finely cut with a bite so that the cross section is inclined forming a tear damping hole by forming a straight opening part; (C) taking out the contact lens on which the opening portion is formed; wherein the contact lens has an optical portion, a fitting portion positioned outside the optical portion, and an outer periphery positioned outside the fitting portion; Three through-holes spaced apart from each other at a certain distance in the fitting part are formed by the above-described through-pin; The fitting part has a thickness of 0.12 to 0.14 mm, the tear damping hole is located 4.5 to 5.0 mm away from the center of the main body, and the height of each of the tear damping hole and the indented part is 0.015 to 0.025 mm, and the tear damping hole has a height of 0.015 to 0.025 mm. The height of the cylindrical central portion between the and the indentation is 0.08 to 0.10 mm, and the diameter of the cylindrical central portion is 0.115 to 0.125 mm, which can be smoothly achieved by the manufacturing method of a contact lens having a tear damping hole.
Optionally, in the contact lens forming step, a male mold is used in which the plurality of penetrating pins are formed on a hemispherical protruding rim for forming a lacrimal fluid circuit, the bottom width of the lacrimal fluid circuit is 0.7 to 0.9 mm, and R=2.5/1000. It can also be formed to ~3.5/1000.

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The contact lens according to the manufacturing method of the contact lens having tear damping holes according to the present invention has a plurality of tear damping holes spaced apart from each other at a certain distance from each other on the outside adjacent to the optical part, and the lower part of the tear damping holes is curved The upper part is a straight or curved indentation part, so that the slight contraction of the outer periphery due to the tension of the eyelid when closing the eyes due to blinking and the inflow and discharge of tear fluid by restoration when opening the eyes can be smoothly performed, so that it is comfortable to wear. It has the advantage of less dryness, less hula phenomenon, and less light bleeding, and optionally, the tear circulation effect can be further enhanced by forming a single tear circulation path and installing a damping hole therein.

1 is a perspective view of a contact lens having a tear damping hole according to the manufacturing method of the present invention.
2 is a cross-sectional view and a partially enlarged view of the wearing state of FIG. 1;
3 is a cross-sectional view and a partially enlarged view of another worn state of FIG. 1;
4 is a plane dimension view of an example of a contact lens having a tear damping hole according to the manufacturing method of the present invention.
Figure 5 is another similar perspective view of Figure 1;
6 to 8 are questionnaire evaluation results of Test Examples 1 to 3, respectively.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Fig. 1 is a perspective view of a contact lens 1 having a tear damping hole according to the manufacturing method of the present invention, Fig. 2 is a cross-sectional view and a partially enlarged view of the wearing state of Fig. 1, and Fig. 3 is a tear fluid according to the manufacturing method of the present invention. An exemplary plane dimension view of a contact lens 1 having a damping hole, and FIG. 4 is another similar perspective view of FIG. 1, which will be referred to together for convenience of description.

The contact lens (1) having a tear damping hole according to the manufacturing method of the present invention is a body having an inner surface (2b) formed in a curved surface to contact the cornea (10) and an outer surface (2a) spaced apart from the cornea (10) (2) is formed.

The body 2 has an optical part 3 located in the central part, a fitting part 4 located outside the optical part 3, and an outer periphery part 5 located outside the fitting part 4. is integrally formed by, and a tear damping hole 6, which is characteristic of the present invention, is formed in the fitting part 4.

The optical part 3 is an area where the pupil, which is accompanied by a change in diameter due to the contraction and relaxation of the iris, is located, and the fitting part 4 located outside the optical part 3 is radially formed by the capillarity of the tear fluid. When the contact lens 1 is moved from the equilibrium position due to eye blinking at the same time as the contact lens 1 is fixed by the applied tension, according to the tension caused by the capillary action that undergoes non-uniform change according to the gap of the lacrimal fluid layer It is an area to restore the contact lens 1 to the equilibrium position, and the periphery of the outer periphery 5 located outside the fitting part 4 forms a tear passage 5a formed to be slightly lifted from the cornea 10, When blinking, it functions as a passageway for excretion and inflow of tear fluid.

Here, the tear damping hole 6 is formed between the upper opening part 6b and the lower recessed part 6a, and the cylindrical central part located between the opening part 6b and the recessed part 6a (reference numerals not shown). Since the thickness of the above-mentioned cylindrical central part is formed to be about 25 to 35% thinner than the thickness of the main body 2, when the slight contraction force of the outer periphery due to the tension of the eyelid acts when closing the eye due to blinking, Of course, by enabling the inflow and discharge of tear liquid by the restoring force to be smoothly performed during eye opening, it is possible to impart a good feeling of wearing with less fear of dryness.

The indentation portion 6a may be formed in a convex round curved shape forming an incline, and the plucking portion 6b may be cut in a straight line or curved shape forming an inclination by a cutting tool.

It is important that the indentation (6a) has a convex round shape of R = 2 ~ 3mm, because the cornea (10) is very sensitive with about 50 times more nerves than the fingertips, so it is a comfortable contact with little foreign body sensation A wearing feeling of the lens 1 is imparted.

In the contact lens 1 according to the manufacturing method of the present invention, the dimensions are not strictly limited, but the thickness of the main body 2 including the fitting part 4 is generally 0.12 to 0.14 mm, specifically 0.125 to 0.14 mm. 0.135mm, outer diameter is generally 12mm ~ 14mm, specifically 12mm ~ 13mm, R = 7.3 ± 0.1, leak damping hole (6) is spaced equidistant from each other at a radius 4.5 ~ 5.0mm from the center of the body (2) You can have 3, 6 or 8 locations.

In addition, the height of each of the opening part 6b and the indentation part 6a of the tear damping hole 6 (the vertical height of the part in contact with the cylindrical center part) is 0.015 to 0.025mm, and the opening part 6b and the indentation part The height of the cylindrical central portion between (6a) is 0.08 to 0.10 mm, and the diameter of the tear damping hole 6, more precisely, the diameter of the cylindrical central portion is generally 0.115 to 0.125 mm.

On the other hand, in the manufacturing method of the present invention, it is possible to selectively form a single circular lacrimal fluid circulation path 7 in the contact lens 1, in which case the lacrimal fluid damping hole 6 is formed in a circular shape. They are located at equal intervals on the lachrymal circuit 7, and the width of the bottom of the lachrymal circuit 7 is 0.7 to 0.9 mm and R = 2.5/1000 to 3.5/1000.

Next, the manufacturing method of the contact lens 1 having the tear damping hole of the present invention is as follows.
Since the method of molding a contact lens having a through hole using a male mold formed with a female mold and a through pin is known, a detailed description thereof will be briefly mentioned with reference to the known technologies mentioned in this specification.

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(A) contact lens molding step:

A male mold having a plurality of through pins formed in a concave round portion of R = 2 to 3 mm at the bottom and a female mold having an annular groove for accommodating the through pins in order to mold a contact lens formed of a curved surface and having a through hole to be in contact with the cornea. In the meantime, a contact lens molding resin monomer such as HEMA is injected and cured to mold a contact lens having a recessed portion formed at the bottom of the through hole.

(B) tear damping hole formation step:

The female mold is released from the male mold, and in a state where the molded contact lens is fixed to the male mold having the through pin, the contact lens is hand processed and at the same time finely cuts the upper part of the through hole formed with the indentation at the bottom to form a cutout By doing so, a leak damping hole is formed.

(C) Taking out the completed tear damping hole forming contact lens:

The contact lens in which the tear damping hole is formed by forming the tearing portion is taken out from the male mold and packed in a container containing a solvent of physiological saline.

Meanwhile, it is needless to say that, optionally, in the contact lens forming step, a male mold formed on a hemispherical protruding rim for forming the lacrimal fluid circulation path may be used.

Example:

The body including the fitting part 4 has a thickness of 0.13 mm, and three tear damping holes 6 are located equidistantly from each other at a distance of 4.55 mm from the center of the body 2, and the tear damping holes ( 6), the height of each of the open-ended portion 6b and the recessed portion 6a is 0.02 mm, and the height of the cylindrical central portion between the open-ended portion 6b and the recessed portion 6a is 0.09 mm, and the cylindrical central portion is 0.09 mm high. The diameter is 0.12 mm, the indentation part 6a is formed as a round part with R = 2 ~ 3 mm, and the tearing part 6b is formed in a straight line. A contact lens (diameter 12.390 mm and base curve R = 7.3) having only a damping hole was manufactured.

Experimental Example 1:

A contact lens having a tear damping hole manufactured in Example was provided, and a survey was conducted on the fit and dryness, movement (hula effect), and light bleeding at the time of initial wearing, and the data of the respondents were summarized and the results is shown in Figure 6.

As a result, it was confirmed that a satisfactory result was significantly higher than that of the conventional contact lens having two tear circuits and three simple through holes.

Experimental Example 2:

Following the initial wear evaluation in Experimental Example 1, a survey was conducted on fit, dryness, movement, and light bleeding after 6 hours of wearing, and the data of the responding people were summarized and the results are shown in FIG. 7.

The result was also confirmed to show a satisfactory result of a significant degree compared to the above-mentioned conventional contact lens.

Experimental Example 3:

Following the evaluation results of wearing for 6 hours in Experimental Example 2, a survey was conducted on fit, dryness, movement, and light bleeding after 2 to 3 days, and the data of the respondents were summarized and the results are shown in FIG. showed up

The result was confirmed to still show a satisfactory result of a significant degree compared to the conventional contact lens described above.

In the above, the present invention has been described through preferred embodiments and test examples, but those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, but these are also within the scope of the present invention.

1: contact lens having a tear damping hole according to the manufacturing method of the present invention
2: body
2a: outer surface 2b: inner surface
3: optical part 4: fitting part
5: outer periphery 5a: lacrimal passage
6: damping hole
6a: Indentation 6b: Opening
7: tear circuit
10: cornea

Claims (7)

delete delete delete delete delete (A) In order to mold a contact lens formed of a curved surface and having a through hole to be in contact with the cornea, a male mold having three through pins formed in a concave round portion of R = 2 to 3 mm at the bottom and an annular groove for accommodating the through pins Molding a contact lens by injecting and curing a resin monomer for forming a contact lens between branched molds;
(B) the female mold is released from the male mold, and while the contact lens is manually processed in a state where the molded contact lens is fixed to the male mold having the through pin, the upper part of the through hole is finely cut with a bite so that the cross section is inclined forming a tear damping hole by forming a straight opening part;
(C) taking out the contact lens on which the opening portion is formed;
The above-mentioned contact lens has an optical part, a fitting part located outside the optical part, and an outer periphery located outside the fitting part, and three through holes spaced apart from each other at a predetermined distance from the fitting part are connected to the through pin. formed by;
The fitting part has a thickness of 0.12 to 0.14 mm, the tear damping hole is located 4.5 to 5.0 mm away from the center of the main body, and the height of each of the tear damping hole and the recessed part is 0.015 to 0.025 mm, and the tear damping hole has a height of 0.015 to 0.025 mm. The height of the cylindrical central portion between the and the indentation is 0.08 to 0.10 mm, and the diameter of the cylindrical central portion is 0.115 to 0.125 mm.
A method for manufacturing a contact lens having a tear damping hole. The method of claim 6, wherein in the contact lens forming step, the plurality of penetrating pins use a male mold formed on a hemispherical protruding rim for forming a lacrimal fluid circuit, the bottom width of the lacrimal fluid circuit is 0.7 to 0.9 mm, and R = 2.5 / 1000 ~ 3.5 / 1000 A method for manufacturing a contact lens having a tear damping hole formed.

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