CN113662707A

CN113662707A - Artificial lens for correcting high myopia

Info

Publication number: CN113662707A
Application number: CN202110855404.9A
Authority: CN
Inventors: 张明瑞; 裴秀娟; 王明坤; 史小文
Original assignee: TIANJIN CENTURY KANGTAI BIO-MEDICAL ENGINEERING CO LTD
Current assignee: TIANJIN CENTURY KANGTAI BIO-MEDICAL ENGINEERING CO LTD
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2021-11-19

Abstract

The invention discloses an intraocular lens for correcting high myopia, comprising a lens body, the intraocular lens body comprising an optical part in the shape of anterior concave and kyphosis and at least two haptics evenly distributed in the outer circumferential direction of the optical part. The end face protrudes from the loop to form a square step with a right angle, the thickness of the optical part decreases from the center of the circle to the surrounding, the angle between the loop and the front surface of the optical part is 5°~12°, and the thickness of the loop is 0.35mm~0.7mm; intraocular lens The total diameter of the body is 10.5~13.5mm, the diameter of the optical part is 6.25mm~7.0mm, the thickness of the square side step is 0.05~0.4mm, and the haptics are arranged rotationally symmetrically or mirror-symmetrically about the central axis of the optical part; the present invention has a structure Simple, reasonable concave-convex design of the optical part, which increases the close fit with the posterior capsule, reduces the opacity rate of the posterior capsule, thickens the haptic design, increases the diameter of the optical part, improves the stability of the intraocular lens, and is more suitable for patients with high myopia The structure and physiological state of the eye can reduce the risk of fundus complications after cataract surgery for high myopia.

Description

Artificial lens for correcting high myopia

Technical Field

The invention belongs to the technical field of artificial lenses, and particularly relates to an artificial lens with high capsular bag stability and low posterior capsular opacification rate for correcting high myopia.

Background

Axial high myopia refers to myopia with axial length greater than 26mm and diopter of-6.00D, and in recent years, the number of patients with axial high myopia and cataract in China is increased year by year, and the visual impairment is very serious. With the rapid development and development of the ultrasonic emulsification technology, for cataract patients with combined ultrahigh myopia, in order to restore the normal refractive state of the operative eye while increasing the stability of intraocular tissues and preventing retinal detachment, the negative power intraocular lens is applied to clinical application and needs to implant a lower power or negative power intraocular lens to eliminate the myopia state for the patients with original high myopia.

At present, the existing low-power intraocular lenses are few, the optical part is mostly designed to be flat, biconcave or biconvex, the loop is thin, the loop type is single, the included angle between the optical part and the loop is too small or even 0 degrees, so that the loop supporting force is small, the whole product is thin, the design is single, the product stability is not good enough, the rotation is easy to occur, the product cannot be well attached to a posterior capsule, and the incidence rate of posterior capsule opacification is high.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide an intraocular lens for correcting high myopia, which has a simple structure, a reasonable concave-convex design of an optical part, increased close fit with a posterior capsule, reduced posterior capsule opacification rate, thickened haptic design, increased diameter of the optical part, improved stability of the intraocular lens, increased close fit with the posterior capsule, reduced posterior capsule opacification rate, better suitability for the structure and physiological state of eyes of a high myopia patient, strong support of a posterior capsule membrane, effective maintenance of the shape of a vitreous body, reduction of forward gushing of the vitreous body, reduction of traction of the vitreous body to a retina and reduction of the risk of fundus complications after high myopia cataract surgery.

In order to achieve the purpose, the invention provides an intraocular lens for correcting high myopia, which comprises an intraocular lens body, wherein the intraocular lens body comprises an optical part which is concave-front and convex-back, and at least two haptics which are uniformly distributed on the outer circumference of the optical part, the optical power of the optical part is-10D-15D, the back end surfaces of the optical part protrude out of the haptics to form square steps with right angles, the thickness of the optical part decreases from the center to the periphery, and the included angle between the haptics and the front end surface of the optical part is 5-12 degrees.

Preferably, the total diameter of the artificial lens body is 10.5-13.5 mm, and the diameter of the optical part is 6.25-7.0 mm;

preferably, the thickness of the square step is 0.05-0.4 mm;

preferably, the thickness of the haptics is 0.35 mm-0.7 mm;

preferably, the haptics are rotationally or mirror-symmetrically disposed about the optic's central axis;

preferably, the haptics are square, oval or contoured in shape;

preferably, the haptics have circular or shaped threading holes therein;

preferably, the material of the artificial lens body is hydrophilic acrylate material or hydrophobic acrylate material.

The artificial lens for correcting the high myopia provided by the invention has the following beneficial effects:

1. the invention effectively solves the technical problems of less artificial lens with low degree, thin loop, single loop type, small loop supporting force, poor product stability and high incidence rate of posterior capsule opacification in the prior art, and ensures that the artificial lens has good stability by the optical part with concave front and convex back, the included angle between the loop and the optical part and the thickened loop and the optical part, can be more tightly jointed with the posterior capsule, can play a role of supporting vitreous body to a certain extent, and reduces the risk of retinal detachment after cataract operation to a great extent by implanting the artificial lens. Moreover, the central thickness of the optical part is increased, the rear end surface of the optical part protrudes out of the haptics and has a heightened right-angle square-side step design, the close fit degree with the posterior capsule is further increased, and the posterior capsule turbidity rate is reduced. The high-strength back capsular sac can be closely attached to the back capsular sac, is more suitable for the structure and physiological state of eyes of patients with high myopia, can effectively maintain the shape of the vitreous body under the strong supporting effect of the back capsular sac, reduces the forward surge of the vitreous body, can reduce the traction of the vitreous body to the retina, and reduces the risk of eyeground complications after the high myopia cataract operation.

2. The two-loop, three-loop or four-loop artificial lens can be designed according to requirements, the stability of the artificial lens is greatly improved through optimizing large compression force and large contact area with the capsular bag, the incidence rate of posterior capsular membrane wrinkles is reduced, the selection range is wide, and the artificial lens with more proper degrees is provided.

3. The rear end face of the optical part forms a strong sharp right-angled square-edge step which can block the migration and proliferation of lens epithelial cells and generate an effective barrier effect on the migration of the lens epithelial cells, so that the incidence rate of postoperative posterior cataract and lens anterior capsule contraction is low, the operation rate of laser lens posterior capsule incision is reduced, and the risk of retinal detachment can be reduced by the complete lens posterior capsule.

4. The artificial lens is made of hydrophilic acrylate material, has good toughness, can be processed at normal temperature, has large optical part and thick loops, and the loops of the artificial lens made of the material have diversified shapes, strong plasticity, good loop supporting force, wide contact range with the capsular bag and good product stability, and can prevent the capsular bag from shrinking.

Drawings

FIG. 1 is a schematic representation of the anterior-posterior direction of an intraocular lens with three haptics for correcting high myopia according to the present invention.

Fig. 2 is a schematic view of the structure of fig. 1 from the rear to the front.

Fig. 3 is a side view of fig. 1.

FIG. 4 is a schematic representation of an intraocular lens with four haptics for correcting high myopia according to the present invention from an anterior-posterior direction.

Fig. 5 is a schematic view of the structure of fig. 4 from the rear to the front.

Fig. 6 is a side view of fig. 4.

FIG. 7 is a schematic representation of an intraocular lens with two haptics for correcting high myopia according to the present invention from an anterior to posterior direction.

Fig. 8 is a structural view from the rear to the front in fig. 7.

Fig. 9 is a side view of fig. 7.

FIG. 10 is a schematic representation of an alternative embodiment of an IOL of the present invention having two haptics for correcting high myopia from an anterior to posterior direction.

Fig. 11 is a structural view from the rear to the front in fig. 10.

Fig. 12 is a side view of fig. 10.

In the figure:

1. the optical part 11, the square side step 2, the loop 21 and the threading hole.

Detailed Description

The present invention will be further described with reference to the following specific embodiments and accompanying drawings to assist in understanding the contents of the invention.

As shown in figures 1-12, an intraocular lens for correcting high myopia provided by the present invention comprises an intraocular lens body implanted in a posterior capsular bag of a human eye having a natural crystalline lens for correcting a refractive condition of the human eye. The intraocular lens body comprises an optical part 1 which is concave-convex in front and convex-back and at least two loops 2 which are uniformly distributed in the outer circumferential direction of the optical part 1. The optical part 1 has the focal power of-10D-15D, and the back end surface of the optical part protrudes out of the loop 2 to form a square step 11 with a right angle, which can block the migration and proliferation of lens epithelial cells and generate an effective barrier effect on the migration of the lens epithelial cells, so that the incidence rate of postoperative posterior cataract and lens anterior capsular contraction is low, the operation rate of laser lens posterior capsular incision is reduced, and the complete lens posterior capsular can reduce the risk of retinal detachment. The thickness of the optical part 1 decreases from the center to the periphery, and the included angle between the loop 2 and the front end surface of the optical part 1 is 5-12 degrees. The total diameter of the artificial lens body is 10.5-13.5 mm, the diameter of the optical part is 6.25-7.0 mm, and the thickness of the square step 11 is 0.05-0.4 mm. The haptics 2 are rotationally symmetrical or mirror-symmetrically arranged about the central axis of the optical portion 1, the shape of the haptics 2 is square, oval or special-shaped, the thickness of the haptics 2 is 0.35 mm-0.7 mm, and the haptics 2 are provided with circular or special-shaped threading holes 21. The material of the artificial lens body is hydrophilic acrylate material or hydrophobic acrylate material, the material is good in toughness, can be processed at normal temperature, the optical part is large, the loop 2 is thick, the artificial lens loop 2 made of the material is diversified, the plastic manufacturability is strong, the loop 2 supporting force is good, the contact range with the capsular bag is wide, the product stability is good, and the capsular bag can be prevented from shrinking.

Example 1:

as shown in FIGS. 1-3, the present invention provides a three-haptic intraocular lens for correcting high myopia, which is made of a hydrophilic acrylate material having a refractive index of 1.460 and a water content of 26%. The number of the haptics 2 is three, the haptics 2 are radially symmetrical about the central axis of the optical portion 1 and are elliptical, the included angle between the haptics 2 and the front end surface of the optical portion 1 is 10 degrees, and threading holes 21 for suspending the optical portion 1 are arranged on the haptics 2. The total diameter of the intraocular lens body is 11mm, the diameter of the optical portion is 6.5mm, the haptic thickness is 0.45mm, and the thickness of the square-edged step 11 is 0.3 mm.

Meanwhile, mechanical properties of the artificial lens tested under the intraocular condition are simulated according to the mechanical properties and the testing method of YY0290.3, and the details are shown in Table 1:

TABLE 1

Example 2:

4-6, the present invention provides an intraocular lens for correcting high myopia having four haptics 2 which is made from a hydrophilic acrylate material having a refractive index of 1.460 and a water content of 26%. The number of the haptics 2 is four, the haptics 2 are radially symmetrical about the central axis of the optical portion 1 and are elliptical, the included angle between the haptics 2 and the front end surface of the optical portion 1 is 10 degrees, and threading holes 21 for suspending the optical portion 1 are arranged on the haptics 2. The total diameter of the intraocular lens body is 11mm, the diameter of the optical portion is 6.5mm, the haptic thickness is 0.45mm, and the thickness of the square-edged step 11 is 0.3 mm.

Meanwhile, mechanical properties of the artificial lens tested under the intraocular condition are simulated according to the mechanical properties and the testing method of YY0290.3, and the details are shown in Table 2:

TABLE 2

Example 3:

as shown in fig. 7-9, the first intraocular lens for correcting high myopia provided by the present invention has two haptics 2, wherein the number of the haptics 2 is two, the number of the haptics 2 is rotationally symmetric about the central axis of the optical portion 1, the shape is C-shaped, and the included angle between the haptics 2 and the anterior surface of the optical portion 1 is 10 °, and the refractive index of the material is 1.460 and the water content thereof is 26%. The total diameter of the intraocular lens body is 11mm, the diameter of the optical portion is 6.5mm, the haptic thickness is 0.45mm, and the thickness of the square-edged step 11 is 0.3 mm.

Meanwhile, mechanical properties of the artificial lens tested under the intraocular condition are simulated according to the mechanical properties and the testing method of YY0290.3, and the details are shown in Table 3:

TABLE 3

Example 4:

as shown in fig. 10-12, the second intraocular lens for correcting high myopia provided by the invention has two haptics 2, the number of the haptics 2 is two, the haptics 2 are radially symmetrical about the central axis of the optical portion 1 and have a C-shape, the included angle between the haptics 2 and the front end surface of the optical portion 1 is 10 degrees, and threading holes 21 for suspending the optical portion 1 are arranged on the haptics 2. The total diameter of the intraocular lens body is 11mm, the diameter of the optical portion is 6.5mm, the haptic thickness is 0.45mm, and the thickness of the square-edged step 11 is 0.3 mm.

Meanwhile, mechanical properties of the artificial lens tested under the intraocular condition are simulated according to the mechanical properties and the testing method of YY0290.3, and the details are shown in Table 4:

TABLE 4

In order to verify that the intraocular lens provided by the invention has the technical effects of large compressive force, large contact angle range with the capsular bag and great guarantee of stability of the intraocular lens in the capsular bag, the four types of haptic intraocular lenses of examples 1-4 and the intraocular lens for correcting high myopia in the prior art are respectively selected, mechanical properties of the four groups of intraocular lenses tested under intraocular conditions are simulated according to YY0290.3 mechanical properties and a testing method, and specific data are detailed in Table 5:

TABLE 5

As can be seen from the table 5, the intraocular lens for correcting high myopia provided by the invention has the advantages that the mechanical performance of the intraocular lens with the focal power of 5D is far better than that of the prior art, the center of the optical part 1 is thickened, the included angle between the loop 2 and the optical part 1 is increased, the loop is thickened, the thickness of the square-edge step 11 is increased, the optical part 1 with the concave-convex design is more easily attached to the posterior capsule, the incidence rate of posterior capsule opacification is greatly reduced, the compression force is large, the range of the contact angle between the optical part and the capsular bag is large, the stability in the capsular bag is ensured, and the intraocular lens has a great market popularization prospect.

The invention effectively solves the technical problems of less artificial crystalline lens with low degree, thin loop 2, single loop 2 type, small supporting force of the loop 2, poor product stability and high incidence rate of posterior capsule opacification in the prior art, and ensures that the artificial crystalline lens and the posterior capsule can be more tightly jointed by the optical part with the concave front and the convex back, the included angle between the loop 2 and the optical part 1 is enlarged, and the loop and the optical part are thickened, thereby playing a role of supporting vitreous body to a certain extent, and reducing the risk of retinal detachment after cataract operation to a great extent by implanting the artificial crystalline lens. Moreover, the central thickness of the optical part 1 is increased, the back end surface of the optical part 1 protrudes out of the haptics 2 and is provided with heightened right-angled square-edge steps 11, the close fit degree with the posterior capsule is further increased, and the posterior capsule turbidity rate is reduced. The high-strength back capsular sac can be closely attached to the back capsular sac, is more suitable for the structure and physiological state of eyes of patients with high myopia, can effectively maintain the shape of the vitreous body under the strong supporting effect of the back capsular sac, reduces the forward surge of the vitreous body, can reduce the traction of the vitreous body to the retina, and reduces the risk of eyeground complications after the high myopia cataract operation.

1. Terms indicating the positional relationship such as "anterior" and "posterior" are relative to the distance of the posterior capsule of the eye. For example, in the case of the intraocular lens of the present invention, the posterior face of the optical portion is the optical portion that is closer to the posterior capsule of the eye than the anterior face of the optical portion.

"haptics" refers to the portions attached to the optic that serve to both support the optic and transfer the compressive forces generated by the contraction and flexure of the ciliary muscles to the optic.

3. The "contact angle" is the angle at which the haptics of the intraocular lens support eye tissue in close to full contact with the haptics when compressed to a prescribed diameter simulating the size of the capsular bag of 10 mm.

4. "compression force" means the compression force generated by the haptics when the haptics are compressed to a prescribed diameter simulating the size of the capsular bag with the body free to move.

The inventive concept is explained in detail herein using specific examples, which are given only to aid in understanding the core concepts of the invention. It should be understood that any obvious modifications, equivalents and other improvements made by those skilled in the art without departing from the spirit of the present invention are included in the scope of the present invention.

Claims

1. an intraocular lens for correcting high myopia, is characterized in that, comprises intraocular lens body, and described intraocular lens body comprises the optic part that is anteroconcave and kyphosis and at least two are evenly distributed in the outer circumferential direction of optic part. Hap, the optical power of the optical part is -10D ~ 15D and its rear end surface is convex in the haptic to form a square side step with a right angle, the thickness of the optical part decreases from the center of the circle to the surrounding, the front end of the optical part and the haptic The included angle of the faces is 5°~12°.

2. The intraocular lens for correcting high myopia according to claim 1, wherein the total diameter of the intraocular lens body is 10.5-13.5mm, and the diameter of the optical part is 6.25mm-7.0mm .

3 . The intraocular lens for correcting high myopia according to claim 1 , wherein the thickness of the square edge steps is 0.05-0.4 mm. 4 .

4 . The intraocular lens for correcting high myopia according to claim 1 , wherein the thickness of the haptics is 0.35mm˜0.7mm. 5 .

5 . The intraocular lens for correcting high myopia according to claim 4 , wherein the haptics are arranged in rotational symmetry or mirror symmetry with respect to the central axis of the optical portion. 6 .

6 . The intraocular lens for correcting high myopia according to claim 5 , wherein the shape of the haptics is square, oval or special-shaped. 7 .

7 . The intraocular lens for correcting high myopia according to claim 6 , wherein the loop has a round or special-shaped threading hole. 8 .

8 . The intraocular lens for correcting high myopia according to claim 1 , wherein the material of the intraocular lens body is a hydrophilic acrylate material or a hydrophobic acrylate material. 9 .