JPH06218001A - One piece intraocular implanted lens - Google Patents

Abstract

PURPOSE:To provide an one piece intraocular implanted lens provided with a supporting arm part which has proper elasticity and flexibility and at the same time, enough mechanical strength. CONSTITUTION:Between contour shapes of both sides in the width direction of a root part 21, the contour shape standing up from a point P1 is made into a shape expressed by a curve P1P5 being convex toward the middle line 24 and on the other hand, a curve P2P3 expressing the contour of the base end part of the contour shape standing up from a point P2 is made into a curved shape being convex toward the middle line 24, In addition, a curve P3P4 following this base end part is formed in such a way that it is approximately along the curve of the middle line 24 and it becomes a curve being concave toward the middle line 24 side with a curvature being larger than the curvature of curve of the curve P1P5 on the opposite side and the middle line 24 makes a specified angle to the diameter direction LD.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intraocular lens which is implanted in the eye instead of a crystalline lens whose function is impaired by a cataract or the like, and a lens arm and a supporting arm which supports the lens in the eye. And an integrally formed one-piece intraocular lens made of the same material.

[0002]

2. Description of the Related Art An intraocular lens to be implanted in an eye instead of a crystalline lens whose function is impaired due to cataract or the like is composed of a substantially circular lens portion and a supporting arm portion for supporting the lens portion in the eye. However, in general, a one-piece intraocular lens is one in which the support arm and the lens are integrally formed of the same material, and the support arm and the lens are separately formed and fixed to the lens. The two-piece or three-piece intraocular lens is used.

In this case, in the two-piece or three-piece intraocular lens, since the supporting arm portion is made of a material different from that of the lens portion, it is considered that the supporting arm portion has sufficient elasticity and flexibility. At the same time, it is possible to choose a material having sufficient strength relatively freely. On the other hand, since it is necessary to provide a mounting hole or the like for fixing the support arm portion to the lens portion, the effective area of the lens portion is limited and the manufacturing process is relatively complicated.

In this respect, the one-piece intraocular lens does not need to be provided with a mounting hole or the like in the lens portion, so that a large effective area of the lens portion can be secured and the manufacturing process can be relatively simplified. It has become possible to be. However, in the one-piece intraocular lens, the supporting arm portion must be made of the same material as the lens portion, so that the degree of freedom in selecting the material is limited, and the one-piece intraocular lens does not necessarily have sufficient elasticity, flexibility and strength. I can't choose the material. For this reason, conventionally, it has been attempted to provide the support arm portion with an appropriate shape so as to have elasticity, flexibility and strength.

FIGS. 8 and 9 show conventional one-piece intraocular lenses 100 and 200 disclosed in JP-A-3-503253. In each of the examples, two supporting arm portions 102 and 202 having the same shape are provided at symmetrical positions with the centers of the lens portions 101 and 201 as the symmetrical centers.
Mainly, the shapes of the root portions 121 and 221 are different from each other.

8 and 9, the root portion 12 is now
The curve connecting the midpoints in the width direction of Nos.
24 and 224 and the rising points on both sides of the root parts 121 and 221 from the outer circumference of the lens parts 101 and 201 are P1 and P2, respectively, and the midpoints of P1 and P2 are P0 and the lens part 1
The direction of a straight line passing through the center O of 01 and 201 and the midpoint P0 is defined as the diametrical direction LD, and the tangential direction of the point P2 is defined as Ls. Then, the example shown in FIG.
The width of 21 is wider than that of the intermediate portion 123 and the tip portion 122. Also, the midline 124 is from the point P0 to the diametrical direction L.
It is a curve that curves to one side of D, and this curve has a shape such that this curve continuously continues to the intermediate portion 123 and the tip portion 122. At the same time, one side portion of the root portion 121 in the width direction, that is, the side portion 121a rising from the point P1 has a curved shape with a large curvature convex toward the midline, and the other side portion, that is, a point. The side portion 121b rising from P2 is a curve which is inscribed from the point P2 to the tangent line Ls of the point P2 and has a radius of curvature larger than the radius D / 2 of the lens portion 101 and which is the root portion 121b.
From the middle section 123 to the middle section 124
It has a curved line that substantially follows the curved line. In this example, the width of the root portion 121 is wide, and the shape of the side portion rising from the point P2 is a curved shape inscribed in the tangent line of the point P2, and it smoothly transitions from the outer periphery of the lens portion 101. Because it is a curve, the root 12
1 has a large strength. On the other hand, there is a problem that the root part 121 and the part from the root part 121 to the intermediate part 123 are too strong in elasticity and lack flexibility, and it may be difficult to insert them into the eye.

Further, the example shown in FIG. 9 was conceived in order to eliminate the drawbacks of the example shown in FIG. 8, and as shown in the partially enlarged view of FIG. The width immediately becomes almost the same as the middle part 223 and the tip part 222, and the center line 224 in the root part 221 is set.
Is substantially the same as the diametrical direction LD, and both side portions 221a and 221b of the root portion 221 have substantially the same shape. That is, the root portion 221 rises along the substantially diametrical direction LD and is largely curved in the portion up to the intermediate portion 223.
The flexibility from the root portion 221 to the intermediate portion 223 can be ensured.

[0008]

However, the above-mentioned FIG.
Although the example shown in FIG. 8 is excellent in that it is more flexible than the example shown in FIG. 8, the mechanical strength of the root portion 221 and the portion from the root portion 221 to the intermediate portion 223 is weak. It turned out to be flawed. That is, if stress is repeatedly applied to the root portion 221 and the portion from the root portion 221 to the intermediate portion 223 during handling before or during surgery for intraocular insertion, this portion becomes brittle,
In some cases, it turned out that there is a risk of breaking.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a one-piece intraocular eye provided with a supporting arm portion which has appropriate elasticity and flexibility and at the same time has sufficient mechanical strength. It is to provide a lens.

[0010]

In order to solve the above-mentioned problems, a one-piece intraocular lens according to the present invention comprises (1)
A lens part and a supporting member for holding the lens part in the eye, and a part of the outer peripheral part of the lens part is continuously extended outward from the outer peripheral part and is formed of the same material as the lens part. In a one-piece intraocular lens having a support arm portion, the support arm portion, while the root portion thereof rises at a predetermined angle on one side with respect to the diameter direction of the lens portion passing through the root portion, It has a shape that sharply curves to the other side in the diametrical direction as it goes from the root portion to the succeeding middle portion, and the root portion is thicker than the middle portion and the tip portion continuing from the middle portion. In addition, the configuration is characterized in that it is formed so as to sharply narrow at the portion that transitions from the root portion to the intermediate portion. As an aspect of Configuration 1, (2) One-piece intraocular eye of Configuration 1 In the lens, The curved shape from the root to the tip of the support arm is formed by combining a plurality of curved lines having different curvatures, and (3)
In the one-piece intraocular lens according to any one of configurations 1 and 2, the support arm portion has a distal end formed thicker than an intermediate portion between the root and the distal end. It was done.

[0011]

According to the above configuration 1, the shape of the root portion of the support arm is formed so that the root portion of the supporting arm portion rises at a predetermined angle to one side with respect to the diameter direction of the lens portion passing through the root portion, and Forming a shape that sharply curves to the other side with respect to the diametrical direction toward the subsequent intermediate portion, and
The root portion is formed thicker than the intermediate portion and a tip portion continuing from the intermediate portion, and is formed so as to be sharply thinned at a portion where the root portion transitions to the intermediate portion. Due to the configuration, it has a proper flexibility required at the time of insertion, and at the same time, has a supporting arm portion having sufficient elasticity for fixing in the eye and having sufficient mechanical strength. It is now possible to obtain a one-piece intraocular lens.

According to the configuration 2, the curved shape from the root to the tip of the support arm is formed by combining a plurality of curved lines having different curvatures, so that insertion into the eye is easier. It became possible to obtain a one-piece intraocular lens.

Further, according to the structure 3, since the distal end portion of the supporting arm portion is formed thicker than the intermediate portion between the root portion and the distal end portion, the insertion into the eye becomes easier.

[0014]

1 is a plan view of a one-piece intraocular lens according to an embodiment of the present invention, FIG. 2 is a side view of the embodiment, FIG. 3 is a partially enlarged view of FIG. 1, and FIG. FIG. 5 and FIG. 6 are views showing the shape in XY coordinates, and FIG. 5 and FIG.
FIG. 7 is a cross-sectional view of the eyeball after the one-piece intraocular lens of the embodiment is inserted into the eyeball. An embodiment will be described below with reference to these drawings.

In FIG. 1, reference numeral 10 is a one-piece intraocular lens, reference numeral 1 is a lens portion, and reference numeral 2 is a supporting arm portion.
In this one-piece intraocular lens 10, two supporting arms 2 and 2 having the same shape are symmetrically provided outside the lens unit 1 with a center O of the lens unit 1 as a symmetrical center.

Both the lens portion 1 and the support arm portion 2 are made of polymethylmethacrylate (PMMA). Here, the lens portion 1 is a convex lens having a substantially circular shape in plan view, and the diameter of the lens is about 7 mm. The lens unit 1 is not limited to the convex lens, and a concave lens, a plano-convex lens, a plano-concave lens, a meniscus lens, an aspherical lens, or the like can be used as necessary.

The support arm portion 2 is formed by extending a part of the outer peripheral portion of the lens portion 1 outward, and has a root portion 21 which is an extension start portion from the outer periphery of the lens portion 1 and a tip end of the support arm portion 2. And a middle portion 23 located between the tip portion 22 and the root portion 21, and the root portion 21 is the root portion 21.
The lens portion rises at a predetermined angle θ (θ = 0 to 45 °) on one side (right side in the figure) with respect to the diametrical direction of the lens section passing through, and the diametrical direction is increased toward the intermediate section 23. A portion that has a shape that sharply curves to the other side (left side in the drawing), and that the root portion 21 is formed thicker than the intermediate portion 23 and the tip portion 22 and that transitions from the root portion 21 to the intermediate portion 23. It is formed so as to sharply become thinner at. The tip 22 is inscribed in an imaginary circle C having a diameter of about 13.5 mm centered on the center O of the lens unit 1. Further, the tip portion 22 is the intermediate portion 23.
It is formed slightly thicker than Below, this support arm 2
The shape of is specifically described.

Now, a curve connecting the middle points in the width direction of the supporting arm portion 2 is a center line 24, and rising points on both sides of the root portion 2 from the outer circumference of the lens portion 1 are P1, P2, P1, P2, respectively.
The center point is P0, the diameter direction of the lens portion 1 passing through the center point P0 is the diameter direction LD, and the change points of the curves representing the contour lines on both sides of the support arm portion 2 in the width direction are P3, P4, P5, respectively. P6
, P7, P8, P9, P10, respectively.

Here, the curves representing the contour of the supporting arm portion 2 on one side in the width direction, that is, the curves rising from the point P1, are the curves P1 P5, P5 P6, and P6 P7.
And a curve P7 P8 and a curve P8 P10 and a curve inscribed in the imaginary circle C are connected, and the curve representing the contour on the other side, that is, the curve rising from the point P2 is the curve P2 P3 and the curve P3 P4 is connected to the curve P4 P9 and the curve along the imaginary circle C.

In this case, the feature of the shape of the root portion 21 is that the contour shape on one side of the contour shapes on both sides in the width direction of the root portion 21, that is, the contour shape rising from the point P1 is the midline 24. It is represented by one curve P1 P5 which is convex towards it, which curve P1 P5 is immediately connected to the curve P5 P6 which represents the contour of the intermediate section 23. On the other hand, the contour shape on the other side, that is, the curve P2 P3 representing the contour of the base end portion of the contour shape rising from the point P2 has a convex curve shape toward the midline 24. The curve P3 P4 following the portion is substantially along the curve of the median line 24, and is a curve concave toward the median line 24 side with a curvature larger than that of the curve of the curve P1 P5 on the opposite side. Further, the center line 24 is formed so as to form an angle θ with the diametrical direction LD. That is, by this, the root part 21
Compared to the thickness of the base end portion of the root portion 21 to the intermediate portion 2
The transitional portion to 3 is slightly thicker, and the transitional portion is formed so as to be sharply curved to the left and at the same time sharply thinned. Due to this feature point, when stress is applied to the support arm portion 2, a part of this stress can be absorbed by the base end portion of the root portion 21 having sufficient strength, whereby the root portion 21. Since the intermediate portion 23 has a proper elasticity and flexibility, it has sufficient strength to withstand repeated stress.

Next, the shape of the support arm portion 2 will be concretely described by the coordinate value of each point (see FIG. 4) and the radius of curvature of each curve in the XY coordinates with the center O of the lens portion 1 as the origin. Shown in. Each of these values is as follows.

XY coordinates P0; X = 2.2819, Y = 2.6538 P1; X = 1.8247, Y = 2.9867 P2; X = 2.6726, Y = 2.2551 P3; X = 2.8051, Y = 2.7309 P4; X = 3.0520, Y = 3.5892 P5; X = 2.5989, Y = 2.9867 P6; X = 2.3875, Y = 4.1229 P7; X = 2.0791, Y = 4.4657 P8; X = 0.4862, Y = 5.6804 P9; X = 0.5532, Y = 5.7918 P10; X = 0.2339, Y = 5.8193 Curvature radius Curve rising from point P1 Curve P1 P5; 0.5889 Curve P5 P6; Straight curve P6 P7; 3.0 Curve P7 P8; 9.12 Curve P8 P10; Curve rising from 3.72 point P2 Curve P2 P3; 0.3 Curve P3 P4; 0.55 Curve P4 P9; 9.25 As shown in FIG. 2, the support arm portion 2 forms an angle α (α = 0 to 15) with respect to a plane orthogonal to the optical axis of the lens portion 1, depending on the purpose. It is formed so as to form.

The one-piece intraocular lens 10 described above is shown in FIG.
7 to 7, the gripping tool 40 such as tweezers or a dedicated tool is used to insert into the eye from an incision 31a formed by incising a part of the cornea of the eyeball 30. As shown in FIG. 7, it is fixed in the eye by the support arm 2 near the iris 32.

In this case, since the base portion 21 has the above-mentioned shape, the support arm portion 2 has both appropriate elasticity and flexibility, and is easily deformed according to the shape of the insertion portion at the time of insertion. It is possible, there is little risk of damaging the insertion part, the insertion work is easy, and after insertion, it can be firmly fixed in the eye with appropriate elasticity. Moreover, since it has sufficient strength, there is no risk of damage during handling.

In the above-described embodiment, the example in which the two support arm portions 2 are provided is shown, but the support arm portions may be one or three or more. Further, as a material forming the lens 1 and the support arm portion 2, any material that can be used as a lens material and at the same time has appropriate elasticity may be used. In addition to PMMA, for example, hydroxyethyl methacrylate,
Silicone, polysulfone, fluorine-based polymer, polycarbonate and the like can be used.

[0026]

As described above in detail, in the one-piece intraocular lens of the present invention, the shape of the root portion of the support arm portion has a predetermined angle on one side with respect to the diameter direction of the lens portion passing through the root portion. Forming a shape that sharply curves toward the other side with respect to the diametrical direction as it goes up from the root portion toward the following intermediate portion, and the root portion is the intermediate portion and the intermediate portion. Is formed thicker than the distal end portion continuing from the above, and is formed so as to be rapidly thinned at the portion transitioning from the root portion to the intermediate portion, so that it is required at the time of insertion. (EN) A one-piece intraocular lens having a supporting arm portion having a sufficient flexibility for fixing in the eye and a sufficient mechanical strength while having an appropriate flexibility. Also,
The curved shape from the root to the tip of the support arm is formed by combining a plurality of curved lines having different curvatures to obtain a one-piece intraocular lens that is easier to insert into the eye. Furthermore, by forming the tip of the support arm thicker than the intermediate portion between the root and the tip,
Insertion into the eye was made easier.

[Brief description of drawings]

FIG. 1 is a plan view of a one-piece intraocular lens according to an embodiment of the present invention.

FIG. 2 is a side view of an embodiment.

3 is a partially enlarged view of FIG.

FIG. 4 is a diagram showing the shape of a support arm portion in XY coordinates.

FIG. 5 is a diagram showing a state of intraocular insertion.

FIG. 6 is a diagram showing a state of intraocular insertion.

FIG. 7 is a cross-sectional view of the eyeball after the one-piece intraocular lens of one embodiment is inserted into the eyeball.

FIG. 8 is a diagram showing a configuration of a conventional one-piece intraocular lens.

FIG. 9 is a diagram showing a configuration of a conventional one-piece intraocular lens.

FIG. 10 is a partially enlarged view of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lens part, 2 ... Support arm part, 10 ... One piece intraocular lens, 21 ... Root part, 22 ... Intermediate part, 23 ... Tip part, 2
4 ... Medium line, LD ... Diameter direction.

Claims (3)

[Claims] 1. A lens part, and a support member for holding the lens part in the eye, wherein a part of an outer peripheral part of the lens part is continuously extended outward from the outer peripheral part to form a lens part. In a one-piece intraocular lens having a supporting arm formed of the same material, the supporting arm forms a predetermined angle on one side with respect to a diameter direction of the lens part whose root passes through the root. Is formed so as to rise from the root portion to a subsequent intermediate portion and sharply curves to the other side in the diametrical direction, and the root portion continues from the intermediate portion and the intermediate portion. Formed thicker than the tip,
A one-piece intraocular lens, wherein the one-piece intraocular lens is characterized in that it is formed so as to sharply become thinner at a portion where the root portion transitions to an intermediate portion. 2. The one-piece intraocular lens according to claim 1, wherein the curved shape from the root to the tip of the support arm is
A one-piece intraocular lens comprising a combination of a plurality of curves having different curvatures. 3. The one-piece intraocular lens according to claim 1, wherein the support arm portion has a distal end formed thicker than the intermediate portion. lens.