JP4054551B2 - Intraocular lens polishing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for polishing an intraocular lens, and more particularly to a polishing method for polishing while keeping an edge sharp, and a polishing apparatus and a polishing tool used in the polishing method.
[0002]
[Prior art]
Conventionally, after the intraocular lens is placed in the sac of a patient's eye, lens epithelial cells remaining in the sac are proliferated, thereby causing a subsequent cataract in which the posterior capsule part becomes clouded. In order to suppress the subsequent cataract, attempts have been made to regulate cell proliferation by sharpening the edge of the intraocular lens.
[0003]
As shown in FIG. 6, such an attempt is made by placing an intraocular lens 100 with a sharp edge in the sac 101 and pressing the posterior capsule at the edge portion, thereby posterior capsule 103 and intraocular lens. An angle is formed at the contact point with 100 so that the proliferation of the cell 102 does not progress further toward the central part of the posterior capsule.
[0004]
An intraocular lens having a sharp edge is cut into an intraocular lens shape by sharpening the edge of an intraocular lens substrate such as PMMA by cutting, or in an intraocular lens form having a sharp edge in advance. After injecting and hardening a base material, it can obtain by manufacturing methods, such as a molding which takes out an intraocular lens.
[0005]
[Problems to be solved by the invention]
However, when the intraocular lens obtained by the above-described method is polished as the final finish, the edge of the intraocular lens is also polished by conventional buffing or tumbling polishing, and the edge is sharp. It will not become. In such a case, it is also conceivable to mask the edge periphery including the edge with a masking tape in advance to protect the edge from polishing. However, since the lens diameter of the intraocular lens is small and the edge thereof is thin, it is very troublesome to mask the edge with tape while exposing the lens surface to be polished. Further, the masking tape has a drawback that it is easily peeled off during polishing.
[0006]
In view of the above problems of the prior art, an object of the present invention is to provide a method for polishing an intraocular lens capable of easily polishing the lens surface while keeping the edge of the intraocular lens sharp.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is characterized by having the following configuration.
[0008]
(1) In a method of polishing a lens surface of an intraocular lens, a hole provided in a fixing base on which the intraocular lens is placed, and the intraocular lens when the intraocular lens is placed in the hole The intraocular lens is inserted into a hole having a depth at which the height of the edge of the lens is the same as or lower than the height of the edge of the opening formed in the hole. The surface portion of the intraocular lens located above the edge of the opening is polished by a polishing means.
(2) In the polishing method according to (1), the opening diameter of the opening formed in the hole is substantially the same as the lens diameter of the intraocular lens.
(3) In the polishing method of (2), the fixing base is rotated with the optical axis of the intraocular lens as a substantially rotating axis, and a sponge-like polishing means disposed opposite to the fixing base is provided on the fixing base. The polishing is performed by pressing the intraocular lens with a predetermined pressure while rotating in the direction opposite to the rotation direction.
(4) In the intraocular lens polishing method according to (1) to (3), the intraocular lens is fixedly held on the fixing table by sucking a lens surface opposite to the polishing surface of the intraocular lens. Features.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. In this embodiment, a description will be given using a three-piece lens in which an optical part and a support part of an intraocular lens are separately manufactured and then integrated.
[0012]
First, the case where the present invention is applied by buffing as Example 1 and the case where the present invention is applied by tumbling polishing as Example 2 are shown and described below.
[0013]
<Example 1>
FIG. 1 is a diagram showing a schematic configuration of an intraocular lens 100 (only an optical part is shown) used in the present embodiment. The intraocular lens 100 includes a lens front surface 100a, a lens rear surface 100b, and an outer periphery 100c (a side surface portion of the intraocular lens 100 that connects the lens front surface 100a and the lens rear surface 100b discontinuously).
[0014]
The base material of the intraocular lens used in the present embodiment is generally used conventionally, such as an acrylic base material, PMMA (polymethyl methacrylate), silicone, HEMA (hydroxyethyl methacrylate), and composite materials using these materials. Intraocular lens substrates can be used.
[0015]
In addition, the intraocular lens is prepared by pouring the intraocular lens base material into the intraocular lens mold in advance and then curing it, and then molding the intraocular lens from the intraocular lens formwork or the intraocular lens base material. Can be obtained by a conventionally known method such as once producing a flat plate and cutting and forming from it by cutting. At this time, an edge 100d, which is a joint point between the lens front surface 100a (lens rear surface 100b) and the outer periphery 100c, is formed to be as sharp as possible.
[0016]
FIG. 2 shows a schematic configuration of an intraocular lens polishing apparatus used in the present embodiment. Reference numeral 1 denotes a polishing apparatus main body. The polishing apparatus main body 1 is roughly divided into a base part 10 for placing the intraocular lens 100 and a polishing part 20 installed above the base part 10. A plurality of columnar fixing bases 11 for fixing and holding the intraocular lens 100 are arranged at a predetermined interval on the base part 10 (four fixing bases 11 are arranged in FIG. 1).
[0017]
The fixed base 11 is attached to the base part 10 via a rotating shaft 12. Rotating means 13 having a motor is disposed on the base 10, and each rotating shaft 12 is rotated by the rotating means 13. The fixed base 11 can also be rotated by the rotation of the rotating shaft 12.
[0018]
FIG. 3A is a view showing a cross section of the fixed base 11. A recessed portion (hole) 15 that is recessed in a columnar shape for inserting and placing the intraocular lens 100 is provided at the center of the upper surface of the fixed base 11. The opening diameter of the recess 15 is slightly larger than the diameter of the intraocular lens 100.
[0019]
When the opening diameter of the recess 15 is sufficiently larger than the diameter of the intraocular lens 100, the intraocular lens 100 may move around in the recess 15 during polishing, and the intraocular lens 100 may be damaged. . Further, when the intraocular lens 100 is inserted into the recess 15, if the gap between the opening diameter and the diameter of the intraocular lens is wide, a polishing means (in this embodiment, a sponge) having elastic force provided above during polishing is used. There is a risk that the edge 100d may be polished by touching the outer periphery 100c of the edge from this gap.
[0020]
Therefore, the opening diameter of the concave portion 15 is a diameter that allows the intraocular lens 100 to be inserted into the concave portion 15 and does not move around in the concave portion 15, and is as small as possible so that the polishing means does not come into contact with the outer periphery 100 c or the edge 100 d. Thus, it is preferable that the diameter of the intraocular lens 100 is substantially the same.
[0021]
As shown in FIG. 3B, the depth of the recess 15 is such that when the lens rear surface 100 b (or the lens front surface 100 a) of the intraocular lens 100 is brought into contact with the bottom of the recess 15, the edge 100 d It has a depth (dimension) that is the same height as or lower than the edge 15a of the opening, so that the edge 100d does not protrude from the edge 15a of the opening.
[0022]
As described above, the edge 100d of the intraocular lens 100 is positioned at the same position as or lower than the edge 15a of the opening of the recess 15, so that the outer periphery 100c and the edge 100d of the intraocular lens 100 are polished at the time of polishing. Can be prevented. Accordingly, the polishing unit 20 can polish only the lens surface (the lens front surface 100a or the lens rear surface 100b) exposed without being protected by the recess 15.
[0023]
Such a fixing base 11 is formed of a material that is not deformed by a force applied during polishing by the polishing unit 20 (for example, a metal that is not easily rusted such as stainless steel, ceramics, glass, and hardened plastic).
[0024]
Reference numeral 14 denotes an injection nozzle for injecting an abrasive onto the intraocular lens 100 fixedly held on a fixed base. The abrasive is appropriately jetted onto the intraocular lens while being polished in the state of being mixed with pure water.
[0025]
Reference numeral 16 denotes a suction path provided in the fixed base 11 and the rotary shaft 12, and the suction port 16 a is provided in the center of the bottom of the recess 15. The suction path 16 is joined to a suction pump (not shown). By the suction operation of the suction pump, the intraocular lens 100 is sucked from the suction port 16a in the recess 15 and is thereby fixedly held on the fixed base 11.
[0026]
Reference numeral 21 denotes a polishing means provided in the polishing unit 20, and is positioned so as to face the fixed base 11 by the same number (four in this embodiment) as the fixed base 11. The polishing means used in this example uses a cylindrical sponge. In this embodiment, a sponge is used. However, the present invention is not limited to this, and any material that can be polished with a certain degree of elasticity without damaging the intraocular lens 100 may be used. .
[0027]
Reference numeral 22 denotes a mounting base for mounting the polishing means 21 (sponge). In the present embodiment, the polishing means 21 is attached to the mounting base 22 using a double-sided tape on one side. The mounting base 22 is attached to the polishing unit 20 via a rotating shaft 23. The rotating shaft 23 is rotated by rotating means 24 installed inside the polishing unit 20. The rotation mechanism unit 24 includes a motor, and the mounting base 22 can be rotated by rotating the rotation shaft 23 by driving the motor.
[0028]
25 moves the polishing unit 20 in the vertical direction with respect to the base unit 10, and when the polishing means 21 is rotating (during polishing to the intraocular lens 100), the mounting table 22 is moved back and forth with respect to the fixed table 11 This is a polishing unit driving means for driving in the vertical direction of the drawing. Reference numeral 30 denotes a control means for controlling the driving of the rotation means 13 and 24, the drive means 25, the ejection nozzle 14, and the like.
[0029]
The mounting base 22 and the rotating shaft 23 are attached to the polishing unit 20 with a slight inclination with respect to the fixed base 11 in the front side of the drawing. Further, the rotation of the mounting base 22 is opposite to the rotation direction of the fixed base 11. With such a configuration, the polishing means 21 can be effectively pressed against the intraocular lens 100, and the polishing can be efficiently performed by the mutual rotation of the polishing means and the fixing base.
[0030]
A method of polishing the intraocular lens 100 with the polishing apparatus having the above configuration will be described below.
When the lens front surface 100a is polished, the intraocular lens 100 is inserted into the concave portion 15 of the fixing base 11 with the lens rear surface 100b, which is the lens surface opposite to the polished surface, facing downward. The intraocular lens 100 is sucked from the suction port 16a by a suction pump (not shown) and is fixedly held in the recess 15. Next, the control unit 30 drives the rotating means 11 and 24 to rotate the fixed base 11 and the polishing means 21. When the fixed base 11 and the polishing means 21 start to rotate, the control unit 30 injects an appropriate amount of abrasive onto the intraocular lens 100 from the ejection nozzle 14. At the same time, the polishing unit 20 is lowered to the lower side (the base unit 10 side) using the driving unit 25, and the tip portion of the polishing unit 21 is applied to the fixed base 11 with a predetermined pressure (a degree that the polishing unit 21 is slightly deformed). Press to start polishing.
[0031]
Here, only the lens front surface 100 a of the intraocular lens 100 placed on the fixed base 11 is exposed, and only this portion is polished by the polishing means 21. After the polishing is completed, the intraocular lens 100 is then turned over to expose the lens rear surface 100b from the fixed base 11, and the polishing is performed in the same manner. By performing such polishing, the edge outer periphery 100c and the edge 100d are not polished. Therefore, the edge 100d was formed during the manufacture of the intraocular lens even after the polishing of both surfaces of the intraocular lens 100 was completed. A sharp edge shape can be maintained.
[0032]
Here, FIG. 7 shows an electron micrograph of the edge of the intraocular lens polished by the above polishing method. As a comparative example, an electron micrograph of the edge of an intraocular lens by conventional buffing is shown in FIG. 8 (the intraocular lens shown in FIGS. 7 and 8 has a sharp edge at the time of manufacture). As shown in these drawings, the edge portion (FIG. 7) of the intraocular lens polished by the above polishing method is not rounded and maintains sharpness. On the other hand, the edge of the intraocular lens (FIG. 8) performed by conventional buffing is rounded by polishing.
[0033]
In Example 1, although the recessed part 15 shall be provided in the fixing stand 11, it does not restrict to this. A polishing tool for protecting the edge 100d can be newly attached to a fixed base of a polishing apparatus conventionally used for buffing. FIG. 4 is a diagram illustrating the configuration of the polishing tool. FIG. 4A is a schematic external view of the polishing tool as viewed from above, and FIG. 4B is a cross-sectional view showing a state in which the polishing tool is attached to a fixed base of the polishing apparatus. Those given the same reference numerals as those shown in the above-described embodiment have the same functions and will not be described.
[0034]
Reference numeral 40 denotes a polishing instrument body. The polishing tool 40 has a circular flat plate shape having substantially the same diameter as the fixed base. The material is not deformed by the force applied at the time of polishing in the polishing section 20, and is preferably resistant to rust and wear resistant. For example, stainless steel or ceramics can be used. Four screw holes 42 are provided in the outer peripheral portion of the polishing tool 40 for attaching to the fixing base 50 of the polishing apparatus with screws. The screw hole 42 has a wood screw hole shape so that the screw head does not protrude above the screw hole when the screw is closed. Further, the thickness of the peripheral portion of the screw hole 42 is sufficient to allow the screw to be attached.
[0035]
Reference numeral 43 denotes a concave portion provided with an opening (hole) 41 having a diameter approximately the same as the diameter of the intraocular lens 100 at the center thereof. The depth of the opening 41, that is, the thickness of the bottom of the recess 43 (region around the opening) is such that the height of the edge 100 d of the intraocular lens 100 when the intraocular lens 100 is inserted into the opening 41. It has a thickness (depth of the opening 41) that is the same as or below the edge of the opening 41.
[0036]
In addition, various types of polishing instruments 40 having different depths of the opening 41 can be used depending on the thickness of the intraocular lens to be polished. It can also correspond to a lens.
[0037]
In this case, when the intraocular lens 100 of the thickest type is used and the intraocular lens 100 is inserted into the opening 41, the edge 100d of the intraocular lens 100 is the same height as the edge of the opening 41, What is necessary is just to prepare the grinding | polishing instrument 40 which has the depth of the opening part 41 (thickness of the bottom of the recessed part 43) located below it.
[0038]
As long as the polishing tool 40 has the depth of the opening 41 as described above, the intraocular lens having any thickness has the edge 100d when the intraocular lens 100 is inserted into the opening 41. The height is the same as or lower than the height position of the opening edge of the opening 41. When polishing, the polishing means is made of an elastic soft material, so that even if the edge 100d is located slightly below the opening edge of the opening 41, the polishing means will be the surface to be polished of the intraocular lens. Polishing can be performed.
[0039]
The diameter of the recess 43 is preferably as wide as possible. This is because when the diameter of the concave portion 43 is small, the polishing means that presses against the intraocular lens 100 from above is difficult to contact the intraocular lens 100.
[0040]
By attaching such a polishing tool 40 to the fixing base 50, it is possible to prevent polishing of the outer periphery and the edge of the edge of the intraocular lens 100 during polishing, similarly to the fixing base 11 shown in the above embodiment. The present invention can be applied even to a polishing apparatus conventionally used.
[0041]
In the embodiment described above, polishing is performed using an intraocular lens before the support portion is attached, but the present invention is not limited thereto, and a three-piece intraocular lens in which the support portion is bonded to the optical portion, The present invention can also be applied to a one-piece intraocular lens in which an optical part and a support part are integrally formed. In this case, the configuration of the polishing tool 40 described above may be slightly changed, and a polishing tool 60 having a groove 61 for storing a support portion as shown in FIG. 5A may be used. Since the support part of the intraocular lens is generally attached to the optical part by inclining from the outer periphery of the edge to the front side of the lens, when polishing the front side of the lens, the support part is not exposed from the bottom of the recess as shown in FIG. The bottom shape of the concave portion 43 shown in b) may be a mortar-like bottom shape 62 as shown in FIG. 5B, and a groove 61 for the support portion may be provided there.
[0042]
Further, when the rear surface side of the lens is polished, the support portion faces downward, so that the bottom shape of the concave portion 43 shown in FIG. 4B is a mountain-shaped bottom shape 63 as shown in FIG. A groove 61 for the support portion may be provided there. In addition, a polishing instrument used for polishing the rear surface side of the lens needs to have a suction path 64 for fixing and holding the intraocular lens 100 at the center of the opening.
[0043]
Even when the intraocular lens 100 to which the support portion is attached is polished as described above, the edge is removed by using the polishing tool shown in FIGS. It is possible to polish the intraocular lens 100 while keeping it sharp.
[0044]
<Example 2>
FIG. 9A is a diagram showing the appearance of a tumbling polishing apparatus to which the present invention is applied.
Reference numeral 60 denotes a polishing apparatus main body, which is an octagonal columnar container having a hollow interior for containing the intraocular lens 100. Reference numeral 61 denotes a lid. By removing the lid 61, an intraocular lens can be inserted into the apparatus main body 60. Reference numeral 62 denotes a roller portion that is rotationally driven by a motor (not shown). As shown in the figure, two roller portions 62 are installed in parallel at a predetermined interval. After the apparatus main body 60 is placed on the two roller portions 62, the rotation of the roller portion 62 causes the device main body 60 to rotate in the direction opposite to the rotation direction of the roller boom portion 62.
[0045]
FIG. 6B is a diagram illustrating an internal configuration of the apparatus main body 60.
A plurality of fixed bases 63 are attached to the inner wall of the apparatus main body 60 (in the figure, four attached states are shown). The fixing table 63 has substantially the same shape as the fixing table shown in the first embodiment, and a recess (hole) for inserting and placing the intraocular lens 100 is provided on the upper surface of the fixing table 63. . The shape of the recess is such that the opening diameter is substantially the same as the diameter of the intraocular lens, and when the intraocular lens 100 is inserted into the recess, the edge 100d of the intraocular lens 100 is the edge of the opening of the recess. The shape is the same as the height position or located below the height position, and has the same function as the concave portion shown in the first embodiment.
[0046]
Reference numeral 64 denotes a polishing means for polishing the intraocular lens 100, and here glass beads are used. The diameter of the glass beads is preferably a diameter that does not enter the gap between the recess and the intraocular lens when the intraocular lens 100 is inserted and placed on the fixing base 63. In other words, the gap between the intraocular lens 100 and the opening diameter of the recess is preferably narrower than the diameter of the glass beads 64.
[0047]
In the polishing apparatus having the above configuration, the polishing method will be described below.
The lid of the apparatus main body 60 is removed, and the intraocular lens 100 is fixedly held by using a double-sided tape or the like in the recess of the fixing base 63 installed on the inner wall. Thereafter, an appropriate amount of abrasive is put into the apparatus main body 60, the lid is closed, and the apparatus main body 60 is placed on the roller unit 62. The surface of the intraocular lens 100 is polished by rotating the roller unit 62 to rotate the apparatus main body 60 and stirring the glass beads inside.
[0048]
When the polishing of one surface of the intraocular lens 100 is completed, the intraocular lens 100 is turned over and the same polishing operation is performed again to polish both surfaces of the intraocular lens. As in the first embodiment, even if polishing is performed, the edge 100d is not polished. Therefore, it is possible to perform polishing while keeping the edge sharp.
[0049]
As described above, in the second embodiment, the polishing method in the tumbling polishing is described. However, the fixing base 63 may not be provided in the apparatus main body 60. For example, as shown in FIG. 10, a plurality of polishing tools 70 having a shape that does not polish the edge 100 d are placed in the apparatus main body 60, and the polishing apparatus 70 is stirred together with the glass beads 64 by rotating the apparatus main body 60. Polishing can also be performed.
[0050]
Here, FIG. 10A is a view when the polishing tool 70 is viewed from above, and FIG. 10B is a view showing a horizontal cross section of the polishing tool 70 shown in FIG. 10A. .
As shown in FIGS. 10A and 10B, the polishing tool 70 is a substantially cylindrical jig, has a weight that can be stirred when the apparatus main body 60 is rotated, and even if it hits another polishing tool 70. It is made of a soft material that does not damage the intraocular lens 100. Examples of such materials include rubber, hard sponges, intraocular lens materials, and the like. Further, as shown in the figure, the outer appearance is not rounded and rounded, thereby preventing damage caused by contact between the polishing instrument 70 and the intraocular lens 100 attached to the other polishing instrument 70 during stirring. is doing.
[0051]
Reference numeral 71 denotes a recess provided in the polishing tool 70, which is provided on each of the top and bottom surfaces of the polishing tool 70. The concave portion 71 has the same function as the concave portion shown in the first embodiment and the concave portion provided in the fixing base 63 of the second embodiment, and the opening diameter of the concave portion 71 is substantially the same as the diameter of the intraocular lens 100. It has become. The depth of the recess 71 is such that when the intraocular lens 100 is inserted and placed in the recess 71, the height of the edge 100d is the same as or lower than the position of the edge 71a of the opening (bottom side of the recess). The depth is such that it is located. The attachment of the intraocular lens 100 to the polishing tool 70 (fixing and holding the intraocular lens 100 in the recess 71) can be performed, for example, with a double-sided tape or the like.
[0052]
After the intraocular lens 100 is attached to such a polishing tool 70, the polishing tool 70 is placed in the apparatus main body 60 and is stirred together with the polishing agent and the glass beads 64 to be polished.
[0053]
【The invention's effect】
As described above, in the present invention, after manufacturing an intraocular lens having a sharp edge, the lens portion can be easily polished while keeping the edge portion of the intraocular lens sharp.
[Brief description of the drawings]
FIG. 1 is a diagram showing the appearance of an intraocular lens used in the present embodiment.
FIG. 2 is a diagram showing a schematic configuration of a polishing apparatus.
FIG. 3 is a diagram showing details of a fixing base provided in the polishing apparatus.
FIG. 4 is a diagram showing a configuration of a polishing tool used for a fixed base.
FIG. 5 is a diagram showing a configuration of a polishing instrument for polishing an intraocular lens to which a support portion is attached.
FIG. 6 is a diagram showing suppression of cell proliferation and progression in the capsule with an intraocular lens having sharp edges.
FIG. 7 is an electron micrograph showing the periphery of an edge of an intraocular lens after being polished by the polishing method of the present invention.
FIG. 8 is an electron micrograph showing the periphery of the edge of an intraocular lens after being polished by conventional buffing.
FIG. 9 is a diagram showing a configuration of a polishing apparatus that performs tumbling polishing.
FIG. 10 is a diagram showing a configuration of a polishing tool placed in a polishing apparatus that performs tumbling polishing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Polishing apparatus main body 10 Base 11 Fixing base 13 Rotating means 15 Recess 20 Recess 20 Polishing section 21 Polishing means 24 Rotating means 25 Driving means 30 Control means 100 Intraocular lens 100d Edge

Claims (4)

  In the method for polishing a lens surface of an intraocular lens, a hole provided in a fixing base on which the intraocular lens is placed, the edge of the intraocular lens when the intraocular lens is placed in the hole The intraocular lens is inserted into a hole having a depth that is the same as or lower than the height of the edge of the opening formed in the hole. A method for polishing an intraocular lens, comprising polishing a surface portion of the intraocular lens located above the edge of the lens by a polishing means.   2. The method for polishing an intraocular lens according to claim 1, wherein the opening diameter of the opening formed in the hole is substantially the same as the lens diameter of the intraocular lens.   The polishing method according to claim 2, wherein the fixing base is rotated with the optical axis of the intraocular lens as a substantially rotating axis, and a sponge-like polishing means disposed facing the fixing base is defined as a rotation direction of the fixing base. A method for polishing an intraocular lens, wherein polishing is performed by pressing the intraocular lens with a predetermined pressure while rotating in the opposite direction.   The intraocular lens polishing method according to claim 1, wherein the intraocular lens is fixedly held on the fixing base by sucking a lens surface opposite to the polishing surface of the intraocular lens. Lens polishing method.

Images