【発明の詳細な説明】（技術分野）本発明は、水晶体の嚢内に挿入されて用いられる眼内レ
ンズにして、焦点調節機能を有する眼内レンズに間する
ものである。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an intraocular lens that is used by being inserted into the capsule of a crystalline lens and has a focus adjustment function.
（背景技術）白内障手術後の視力矯正用レンズ等として用いられてい
る眼内レンズは、レンズの改良や手術技術の発達に伴い
、近年、我国においても、多（の臨床実験の下に、その
使用が増加してきており、従来から一般に用いられてい
る白内障用眼鏡やコンタクトレンズに比して、機能的に
極めて優れていることが認められている。(Background technology) With the improvement of lenses and the development of surgical techniques, intraocular lenses, which are used as vision correction lenses after cataract surgery, have recently been used in many clinical experiments in Japan. Their use has been increasing, and it has been recognized that they are extremely superior in terms of functionality compared to conventional cataract glasses and contact lenses.
ところで、このような眼内レンズは、眼から外科手術に
よって摘出された水晶体の代用品として、眼の前房内或
いは後房内において挿入される光学素子（人工水晶体）
であって、−ａに、第１１図に示されているように、両
凸或いは平凸円板形状のレンズ本体２と、レンズ本体２
から一体的に延び出させられて、レンズ本体２を眼内の
所定の位置に保持するための複数の支持部４とから構成
されている。しかし、このような構造の従来の眼内レン
ズは、焦点が固定であるため、レンズの焦点距離を近距
離に対応して設定した場合には、違距離の物体の像がボ
ケではっきり認識できないといった問題があり、逆にレ
ンズの焦点距離を遠距離に対応して設定、した場合には
、近距離の物体の像がボケて明瞭に知覚できないといっ
た問題を内在していた。Incidentally, such an intraocular lens is an optical element (artificial crystalline lens) inserted into the anterior or posterior chamber of the eye as a substitute for the crystalline lens surgically removed from the eye.
As shown in FIG. 11, -a includes a biconvex or planoconvex disk-shaped lens body 2;
It is composed of a plurality of support parts 4 that integrally extend from the lens body and hold the lens body 2 at a predetermined position within the eye. However, conventional intraocular lenses with this structure have a fixed focus, so if the focal length of the lens is set for close distances, the image of objects at different distances will be blurry and cannot be clearly recognized. On the other hand, if the focal length of a lens was set to correspond to a long distance, there was an inherent problem that the image of a close object would be blurred and could not be perceived clearly.
一方、これに対して、近年、特開昭６３−５７０４４号
公報において、液晶レンズを用い、この液晶レンズに対
する印加電圧を調節して、焦点距離を調節し得るように
した眼内レンズが提案されている。かかる液晶レンズを
用いた眼内レンズによれば、注目物体までの距離に応じ
て印加電圧を調節し、液晶レンズの焦点距離をその注目
物体までの距離に対応させるようにすることにより、注
目物体までの距離に拘わらず、注目物体の像を網膜上に
より鮮明に結像せしめて、その注目物体をより明瞭に認
識できるようにすることができるのである。On the other hand, in recent years, Japanese Patent Laid-Open No. 63-57044 has proposed an intraocular lens that uses a liquid crystal lens and whose focal length can be adjusted by adjusting the voltage applied to the liquid crystal lens. ing. According to an intraocular lens using such a liquid crystal lens, the applied voltage is adjusted according to the distance to the object of interest, and the focal length of the liquid crystal lens is made to correspond to the distance to the object of interest. Regardless of the distance to the object, the image of the object of interest can be formed more clearly on the retina, making it possible to recognize the object of interest more clearly.
ところが、かかる公報に開示の液晶レンズを用いた眼内
レンズにおいては、液晶レンズの構造自体が複雑な上、
レンズ本体（液晶レンズ）とは別に、瞳孔の開度を検出
する手段と、注目物体までの距離をその瞳孔の開度に基
づいて演算する手段と、その演算手段の演算結果に応じ
た電圧を液晶レンズに印加するための手段とを必要とす
るため、その構成が極めて複雑で、実現性に乏しく、ま
た実用性にも乏しいといった問題があった。However, in the intraocular lens using the liquid crystal lens disclosed in this publication, the structure of the liquid crystal lens itself is complicated, and
Separately from the lens body (liquid crystal lens), there is a means for detecting the aperture of the pupil, a means for calculating the distance to the object of interest based on the aperture of the pupil, and a voltage according to the calculation result of the calculation means. Since it requires a means for applying the voltage to the liquid crystal lens, there are problems in that the structure is extremely complicated, is difficult to realize, and is also poor in practicality.
（解決課題）ここにおいて、本発明は、このような事情を背景として
為されたものであり、その解決すべき課題とするところ
は、注目物体までの距離に応じて焦点距離を実質的に調
節し得る眼内レンズであって、構造が簡単で実用性に優
れたものを実現することにある。(Problem to be solved) The present invention has been made against this background, and the problem to be solved is to substantially adjust the focal length according to the distance to the object of interest. The object of the present invention is to realize an intraocular lens that has a simple structure and excellent practicality.
（解決手段）そして、かかる課題を解決するために、本発明にあって
は、水晶体嚢内に挿入して用いる眼内レンズを、（ａ）
凸レンズ機能を備えた光透過性材料からなる光学レンズ
部と、（ｂ）少なくとも知覚される光の光路部に相当す
る部分が光の透過を許容する光透過許容部とされた保持
部と、（ｃ）それら光学レンズ部と保持部とを、前記水
晶体嚢の前後の嚢部に付勢・接触せしめる状態で、知覚
される光の光路部外において弾性的に連結し、該水晶体
嚢の変形に応じて、それら光学レンズ部と保持部とが相
互に接近・離隔移動することを許容する連結手段とを、
含むように構成したのである。(Solution Means) In order to solve this problem, in the present invention, an intraocular lens used by being inserted into the crystalline lens capsule is (a)
(b) an optical lens portion made of a light-transmitting material having a convex lens function; (b) a holding portion in which at least a portion corresponding to the optical path portion of the perceived light is a light transmission permitting portion that allows transmission of light; c) The optical lens part and the holding part are elastically connected outside the optical path of the perceived light in a state where they are biased and in contact with the front and rear capsule parts of the lens capsule, and the lens capsule is prevented from deforming. Accordingly, a connecting means that allows the optical lens part and the holding part to move toward and away from each other,
It was designed to include.
（作用）このような構造の眼内レンズにおいては、眼内の毛様体
に包蔵された毛様体筋が緊張若しくは弛緩して、水晶体
嚢の厚さが変化すると、その水晶体嚢の厚さの変化に応
じて光学レンズ部が網膜に対して前後に相対的に変位す
る。つまり、注目物体までの距離の変化に追随するよつ
に、毛様体筋が緊張若しくは弛緩すると、その注目物体
までの距離の変化に応じて光学レンズ部、ひいては眼内
レンズの焦点が前後に移動するのであり、その結果とし
て、注目物体までの距離に拘わらず、その注目物体の像
が網膜上により鮮明に結像せしめられて、その注目物体
の像がより明瞭に認識され得るようになるのである。(Function) In an intraocular lens with such a structure, when the ciliary muscles housed in the ciliary body in the eye tense or relax and the thickness of the lens capsule changes, the thickness of the lens capsule changes. The optical lens section is displaced back and forth relative to the retina in response to changes in the retina. In other words, when the ciliary muscle tenses or relaxes as the distance to the object of interest changes, the focus of the optical lens, and eventually the intraocular lens, shifts back and forth in response to changes in the distance to the object of interest. As a result, regardless of the distance to the object of interest, the image of the object of interest is formed more clearly on the retina, and the image of the object of interest can be recognized more clearly. It is.
そして、本発明においては、そのような実質的な焦点調
節機能が、光学レンズ部と保持部とを連結手段で弾性的
に連結しただけの簡単な構造で得られる上に、その実質
的な焦点の調節操作が、上述のように、毛様体筋の緊張
乃至は弛緩による眼本来の焦点調節機能によって行なわ
れるようになっていることから、前記公報（特開昭６３
−５７０４４号）に開示の眼内レンズのように、レンズ
本体以外の装備を設けることを不要と為し得るのであり
、また電源の交換乃至は充電の如き特別な保守を不要と
為し得ることから、極めて優れた実用性が得られるので
ある。In the present invention, such a substantial focus adjustment function can be obtained with a simple structure in which the optical lens part and the holding part are elastically connected by a connecting means, and the substantial focus adjustment function As mentioned above, the adjustment operation is performed by the eye's original focus adjustment function through tension or relaxation of the ciliary muscles.
-57044), it is possible to eliminate the need for equipment other than the lens body, and it is also possible to eliminate the need for special maintenance such as replacing the power supply or charging. Therefore, extremely excellent practicality can be obtained.
（実施例）以下、本発明をより一層具体的に明らかにするために、
その実施例を図面に基づいて詳細に説明する。(Example) Hereinafter, in order to clarify the present invention more specifically,
The embodiment will be described in detail based on the drawings.
先ず、第１図および第２図には、本発明の一実施例であ
る眼内レンズ１０が示されている。それらの図から明ら
かなように、本実施例の眼内レンズ１０は、円盤状の平
凸レンズ形状とされた光学レンズ部としてのレンズ材１
２と、同じ（円盤状の平凸レンズ形状とされた保持部と
しての背面部材１４と、それ゛らレンズ部材１２と背面
部材１４とを所定の距離を隔てて互いに共軸的に且つ弾
性的に連結する連結手段としての４本の可撓性のループ
部材１６とから構成されている。First, FIGS. 1 and 2 show an intraocular lens 10 which is an embodiment of the present invention. As is clear from these figures, the intraocular lens 10 of the present example has a lens material 1 as an optical lens portion in the shape of a disk-shaped plano-convex lens.
2, the same as (the back member 14 as a holding part made into a disc-shaped plano-convex lens shape, and the lens member 12 and the back member 14 separated by a predetermined distance from each other coaxially and elastically) It is composed of four flexible loop members 16 as connecting means.
ここで、レンズ部材１２は、ポリメチルメタクリレート
、シリコン、ヒドロキシメチルメタクリレートガラス、
シリコーンエラストマ等の、透光性を有する通常の眼内
レンズ構成材料から構成されており、眼内の虹彩１８の
内孔である瞳孔２０（第３図参照）の開口径よりも大き
な直径、具体的には、４〜８ＩｆｆＩ１１程度の直径を
もって構成されている。そして、第２図に示されている
ように、凸面が外側、すなわち背面部材１４とは反対側
に位置する状態で配置されている。Here, the lens member 12 is made of polymethyl methacrylate, silicon, hydroxymethyl methacrylate glass,
It is made of a normal intraocular lens component material that has translucency, such as silicone elastomer, and has a diameter larger than the aperture diameter of the pupil 20 (see Figure 3), which is the inner hole of the iris 18 in the eye. Specifically, it is configured to have a diameter of about 4 to 8 IffI11. As shown in FIG. 2, the convex surface is located on the outside, that is, on the opposite side from the back surface member 14.
なお、ここで、レンズ部材１２には、第１図に示されて
いるように、後述の水晶体嚢２２（第３図参照）内への
眼内レンズ１０の挿入操作およびその挿入操作後の位置
合わせ操作を容易に行ない得るようにするために、通常
、網膜で知覚される光の光路部の外側の部位において、
フック等を挿入・保合させるための複数（ここでは、４
個）の通孔２４が形成されることとなる。Here, as shown in FIG. 1, the lens member 12 includes an operation for inserting the intraocular lens 10 into the lens capsule 22 (see FIG. 3), which will be described later, and a position after the insertion operation. In order to facilitate the alignment operation, normally, at a location outside the optical path of light perceived by the retina,
Multiple (here, 4) for inserting and securing hooks, etc.
2) through holes 24 are formed.
また、前記背面部材１４は、レンズ部材１２と同様の透
光性材料から構成され、その直径も、レンズ部材１２と
略同じ大きさに設定されている。Further, the back member 14 is made of the same light-transmitting material as the lens member 12, and its diameter is set to be approximately the same size as the lens member 12.
そして、レンズ部材１２と同様に、凸面が外側、すなわ
ちレンズ部材１２と反対側に位置する状態で、配置され
ている。And, like the lens member 12, it is arranged with the convex surface located on the outside, that is, on the opposite side to the lens member 12.
さらに、前記連結手段としてのループ部材１６は、通常
の眼内レンズに用いられるポリメチルメタクリレートポ
リフッ化ビニリデン、ポリプロピレン、シリコーン、ヒ
ドロキシエチルメタクリレート等の材料から構成されて
おり、Ｕ字形状に成形されている。そして、第１図およ
び第２図に示されているように、レンズ部材１２および
背面部材１４の光軸（中心軸）回りに互いに９０°の回
転対象となる状態で、且つ眼内レンズＩＯの側面から見
て、レンズ部材１２および背面部材１４の光軸（眼内レ
ンズ１０の光軸）に対して所定角度傾斜せしめられた状
態で、それぞれの各一端部において、レンズ部材１２お
よび前面部材１４の外周部に形成された取付穴に突入せ
しめられて、溶着固定されている。Further, the loop member 16 as the connecting means is made of materials such as polymethyl methacrylate, polyvinylidene fluoride, polypropylene, silicone, and hydroxyethyl methacrylate used in ordinary intraocular lenses, and is formed into a U-shape. There is. As shown in FIGS. 1 and 2, the lens member 12 and the back member 14 are rotated by 90 degrees around the optical axis (center axis), and the intraocular lens IO is When viewed from the side, the lens member 12 and the front member 14 are tilted at a predetermined angle with respect to the optical axes of the lens member 12 and the back member 14 (optical axis of the intraocular lens 10), and the lens member 12 and the front member 14 are arranged at one end of each of the lens member 12 and the front member 14, respectively. It is inserted into a mounting hole formed on the outer periphery and fixed by welding.
そして、ここでは、水晶体嚢２２内へ挿入しない非拘束
状態において、眼内レンズ１０の全体の厚さが水晶体の
厚さと略同様の厚さとなるように、具体的には、水晶体
の厚さが通常約４鴫であるところから、全体の厚さが３
〜５論程度となるように、それらループ部材１６によっ
て、レンズ部材１２および背面部材１４が相互に連結せ
しめられ、後述するように、水晶体嚢２２内への眼内レ
ンズ１０の挿入・セット状態において、レンズ部材１２
の外側面（凸面）および背面部材１４の外側面（凸面）
が、それぞれループ部材１６の弾性力に基づいて、水晶
体嚢２２の前嚢部２６および後嚢部２８に付勢・接触せ
しめられるようになっている。Here, specifically, the thickness of the crystalline lens is adjusted so that the overall thickness of the intraocular lens 10 is approximately the same as the thickness of the crystalline lens in the unrestricted state where it is not inserted into the lens capsule 22. The overall thickness is 3.
The lens member 12 and the back member 14 are connected to each other by the loop members 16 so that the intraocular lens 10 is inserted and set into the lens capsule 22 as described later. , lens member 12
The outer surface (convex surface) of the back member 14 and the outer surface (convex surface) of the back member 14
are biased and brought into contact with the anterior capsule part 26 and the posterior capsule part 28 of the crystalline lens capsule 22 based on the elastic force of the loop member 16, respectively.
なお、前記各ループ部材１６の端部が突入されて溶着固
定されるレンズ部材１２および背面部材１４の取付穴は
、前記レンズ部材１２に形成された通孔２４と同様、視
覚の妨げとならないように、網膜で知覚される光の光路
部から外れた部位に形成されることとなる。Note that the mounting holes of the lens member 12 and the back member 14 into which the end portions of the respective loop members 16 are inserted and fixed by welding are made so as not to obstruct vision, similar to the through holes 24 formed in the lens member 12. In other words, it is formed in a region that is outside the optical path of light perceived by the retina.
ところで、このような眼内レンズ１０は、第３図に示さ
れているように、水晶体嚢２２からの核及び皮質の摘出
後、それら核及び皮質を摘出した水晶体嚢２２の切開口
から、レンズ部材１２が水晶体嚢２２の前嚢部２６側に
位置し、前面部材１４が水晶体嚢２２の後嚢部２８側に
位置するように、水晶体嚢２２内に挿入され、それらレ
ンズ部材１２と背面部材１４の光軸が眼の光軸と一致す
るように、水晶体嚢２２内で位置合わせされる。By the way, as shown in FIG. 3, such an intraocular lens 10 is constructed by removing the nucleus and cortex from the lens capsule 22, and then inserting the lens through an incision in the lens capsule 22 from which the nucleus and cortex were extracted. The lens member 12 and the back member are inserted into the lens capsule 22 such that the member 12 is located on the anterior capsule 26 side of the lens capsule 22 and the front member 14 is located on the posterior capsule 28 side of the lens capsule 22. 14 is aligned within the lens capsule 22 so that its optical axis coincides with the optical axis of the eye.
なお、かかる水晶体嚢２２内に挿入・セットされた眼内
レンズ１０は、前述のように、ループ部材１６の弾性力
に基づいて、レンズ部材１２の外側凸面が水晶体嚢２２
の前嚢部２６に、また背面部材１４の外側凸面が水晶体
嚢２２の後嚢部２８に、それぞれ付勢・接触せしめられ
ることにより、水晶体嚢２２内のセット位置に安定して
保持されることとなる。Note that the intraocular lens 10 inserted and set in the lens capsule 22 has the outer convex surface of the lens member 12 aligned with the lens capsule 22 based on the elastic force of the loop member 16, as described above.
The outer convex surface of the back member 14 is biased and brought into contact with the anterior capsule part 26 of the lens capsule 22 and the posterior capsule part 28 of the lens capsule 22, thereby being stably held at the set position within the lens capsule 22. becomes.
また、ここで、水晶体嚢２２内への眼内レンズ１０の挿
入・セット操作は、前述のように、レンズ部材１２に形
成された通孔２４内に、フック等を挿入・保合させて行
なわれることとなる。In addition, here, the operation of inserting and setting the intraocular lens 10 into the lens capsule 22 is performed by inserting and securing a hook or the like into the through hole 24 formed in the lens member 12, as described above. It will be.
眼の水晶体嚢２２内にこのように挿入・セットされた眼
内レンズ１０は、上述のように、ループ部材１６の弾性
力に基づいて、レンズ部材１２の外側凸面において水晶
体嚢２２の前嚢部２６に付勢・接触せしめられる一方、
背面部材１４の外側凸面において水晶体嚢２２の後嚢部
２８に付勢・接触せしめられた状態で、セット位置に保
持される。As described above, the intraocular lens 10 inserted and set into the lens capsule 22 of the eye is attached to the anterior capsule portion of the lens capsule 22 on the outer convex surface of the lens member 12 based on the elastic force of the loop member 16. While being energized and brought into contact with 26,
The outer convex surface of the back surface member 14 is urged and brought into contact with the posterior capsule portion 28 of the crystalline lens capsule 22, and is held at the set position.
従って、毛様体３０に包蔵された毛様体筋の緊張若しく
は弛緩によって水晶体嚢２２の厚さが変化すると、その
水晶体嚢２２の厚さの変化に応じ、ループ部材１６の弾
性力に基づいて、あるいはループ部材１６の弾性力に抗
して、眼内レンズ１０のレンズ部材１２と背面部材１４
とが相互に接近・離隔移動せしめられ、その結果、それ
らレンズ部材１２および背面部材１４が網膜に対してそ
れぞれ接近若しくは離隔移動せしめられることとなる。Therefore, when the thickness of the lens capsule 22 changes due to tension or relaxation of the ciliary muscle housed in the ciliary body 30, the elastic force of the loop member 16 changes according to the change in the thickness of the lens capsule 22. , or the lens member 12 and back member 14 of the intraocular lens 10 against the elastic force of the loop member 16.
are moved toward or away from each other, and as a result, the lens member 12 and the back surface member 14 are moved toward or away from the retina, respectively.
そして、それらレンズ部材１２および背面部材１４が網
膜に対してそれぞれ接近若しくは離隔移動せしめられる
結果、それらレンズ部材１２および背面部材１４からな
る眼内レンズ１０の全体としての焦点位置が網膜に対し
て前後に相対移動する。As a result of the lens member 12 and the back member 14 being moved toward or away from the retina, the overall focal position of the intraocular lens 10 made up of the lens member 12 and the back member 14 moves forward and backward relative to the retina. Move relative to.
つまり、注目物体までの距離の変化に追随するように毛
様体筋が緊張若しくは弛緩すると、その注目物体までの
距離の変化に応じて眼内レンズ１０の焦点が前後に移動
せしめられるのであり、それによって、その注目物体の
像が、従来の固定焦点の眼内レンズに比べて、網膜上に
より鮮明に結像されるのである。そして、それ故に、注
目物体の像を、その注目物体までの距離に拘わらず、よ
り明瞭に知覚・認識することが可能となるのであり、し
かも、その構造が極めて簡単で、特別な保守も特に必要
ではないため、実用性にも優れているのである。In other words, when the ciliary muscles tense or relax to follow changes in the distance to the object of interest, the focus of the intraocular lens 10 is moved back and forth in accordance with the change in the distance to the object of interest. As a result, the image of the object of interest is more clearly formed on the retina than with conventional fixed-focus intraocular lenses. Therefore, it is possible to perceive and recognize the image of the object of interest more clearly regardless of the distance to the object of interest, and its structure is extremely simple and requires no special maintenance. Since it is not necessary, it is also highly practical.
なお、上側の眼内レンズ１０では、連結手段としてのル
ープ部材１６が、眼内レンズ１０の側面から見て、眼内
レンズ１０の光軸（レンズ部材１２および背面部材１４
の光軸）に対してそれぞれ傾斜した状態で設けられてい
たが、第４図および第５図に示されているように、眼内
レンズ１０の側面から見て、その眼内レンズ１０の光軸
と一敗するように、４本のループ部材１６を設けること
も可能であり、また第６図、第７図および第８図に示さ
れているように、弓形、バネ形、■形等に成形したルー
プ部材１６でレンズ部材１２と背面部材１４とを弾性的
に連結するようにすることも可能である。さらに、連結
手段は、網膜で知覚される光の光路部外でレンズ部材１
２と背面部材１４とを弾性的に連結し、水晶体嚢２２等
の眼組織を傷付けることな（、水晶体嚢２２内へのセッ
ト状態において、水晶体嚢２２の前・後嚢部２６゜２８
にレンズ部材１２および背面部材１４を付勢・接触せし
めて、水晶体嚢２２の厚さの変化によってそれらレンズ
部材１２および背面部材１４の接近・離隔移動を許容す
るものであればよいが、その連結手段としてループ部材
１６を用いる場合には、第１図および第２図に示す眼内
レンズ１０のように、レンズ１０の側面から見て、ルー
プ部材１６が眼内レンズ１０の光軸に対して傾斜した状
態で設けられることが、水晶体嚢２２内への眼内レンズ
１０の挿入時における引っ掛かりを無くす上で望ましく
、またレンズ部材１２と背面部材１４が共軸状態を保持
して接近・離隔移動するようにするために、第１図乃至
第８図に示すように、複数本のループ部材１６をセット
で用いることが望ましい。In the upper intraocular lens 10, the loop member 16 as a connecting means is connected to the optical axis of the intraocular lens 10 (the lens member 12 and the back member 14 when viewed from the side of the intraocular lens 10).
However, as shown in FIGS. 4 and 5, when viewed from the side of the intraocular lens 10, the light from the intraocular lens 10 is It is also possible to provide four loop members 16 so as to be connected to the shaft, and as shown in FIGS. It is also possible to elastically connect the lens member 12 and the back member 14 with a loop member 16 formed into a shape. Furthermore, the coupling means is arranged to connect the lens member outside the optical path of light perceived by the retina.
2 and the back member 14, so as not to damage the eye tissues such as the lens capsule 22 (in the state set in the lens capsule 22, the anterior and posterior capsule parts 26 and 28 of the lens capsule 22 are connected elastically).
The lens member 12 and the back member 14 may be biased and brought into contact with each other to allow the lens member 12 and the back member 14 to move toward and away from each other depending on changes in the thickness of the lens capsule 22. When the loop member 16 is used as a means, as in the intraocular lens 10 shown in FIGS. It is preferable to provide the intraocular lens 10 in an inclined state in order to avoid getting caught when inserting the intraocular lens 10 into the lens capsule 22, and also to allow the lens member 12 and the back member 14 to maintain a coaxial state and move toward and away from each other. In order to achieve this, it is desirable to use a plurality of loop members 16 as a set, as shown in FIGS. 1 to 8.
また、前記実施例の眼内レンズ１０では、光学レンズ部
としてのレンズ部材１２および保持部としての背面部材
１４の双方に凸レンズ機能が付与されていたが、保持部
としての背面部材１４には必ずしも凸レンズ機能を持た
せる必要はなく、例えば第９図に示す如き、平円盤形状
のものを背面部材１４として採用することも可能であり
、また、第４図および第５図に示す如く、網膜で知覚さ
れる光の光路部に相当する部分が通孔３２とされた構造
のものを採用することも可能である。第４図および第５
図に示す眼内レンズでは、通孔３２が光透過許容部とさ
れているのである。Further, in the intraocular lens 10 of the above embodiment, both the lens member 12 as an optical lens part and the back member 14 as a holding part were provided with a convex lens function, but the back member 14 as a holding part does not necessarily have a convex lens function. It is not necessary to provide a convex lens function; for example, it is possible to use a flat disc-shaped member as shown in FIG. 9 as the back member 14, and as shown in FIGS. It is also possible to adopt a structure in which a portion corresponding to the optical path of the perceived light is a through hole 32. Figures 4 and 5
In the intraocular lens shown in the figure, the through hole 32 is a light transmission permitting portion.
ただし、ここにおいて、前記実施例の眼内レンズ１０の
ように、光学レンズ部としてのレンズ部材１２だけでな
く、保持部としての背面部材１４にも凸レンズ機能を付
与したものにおいては、水晶体嚢２２の厚さの変化に応
じて眼内レンズ全体としての焦点位置が変化するもので
あれば、レンズ部材１２と背面部材１４の何れの凸レン
ズ機能（屈折度数）を大きくしてもよいが、一方の凸レ
ンズ機能を他方の凸レンズ機能に比して充分小さくする
ことが、ひいてはレンズ部材１２が水晶体嚢２２の前嚢
部２６側若しくは後嚢部２８側に配されるもので、レン
ズ部材１２だけに凸レンズ機能を持たせるようにした方
が、より小さい凸レンズ機能で効率的な焦点調節機能が
得られるためにより望ましい。However, here, in an intraocular lens 10 of the above embodiment, in which not only the lens member 12 as an optical lens part but also the back member 14 as a holding part is provided with a convex lens function, the lens capsule 22 The convex lens function (refractive power) of either the lens member 12 or the back member 14 may be increased as long as the focal position of the intraocular lens as a whole changes in response to changes in the thickness of the Making the convex lens function sufficiently smaller than the other convex lens function means that the lens member 12 is disposed on the anterior capsule 26 side or the posterior capsule 28 side of the lens capsule 22, so that only the lens member 12 has a convex lens. It is more desirable to have such a function because an efficient focus adjustment function can be obtained with a smaller convex lens function.
さらに、前記実施例では、背面部材１４がその外側凸面
で水晶体嚢２２の後嚢部２８に直接接触せしめられるよ
うになっていたが、背面部材１４は必ずしもその外側面
で水晶体嚢２２の後嚢部２８に直接接触するようになっ
ている必要はなく、例えば第１０図に示すように、知覚
光の光路部外の背面部材１４の外側面外周部に突起部３
４を設けて、背面部材１４の外側面と水晶体嚢２２の後
嚢部２８との間に所定の間隙を設けるようにしてもよい
。このようにすれば、レーザ照射による後発性白内障の
治療に際して、レーザ光が背面部材１４に合焦すること
を良好に回避して、背面部材１４がレーザ光で損なわれ
ることを良好に防止することが可能となるのである。Furthermore, in the embodiment described above, the back surface member 14 is brought into direct contact with the posterior capsule portion 28 of the lens capsule 22 on its outer convex surface, but the back surface member 14 does not necessarily have to be in direct contact with the posterior capsule portion 28 of the lens capsule 22 on its outer surface. For example, as shown in FIG. 10, there is a protrusion 3 on the outer periphery of the back member 14 outside the optical path of the perceived light.
4 may be provided to provide a predetermined gap between the outer surface of the back member 14 and the posterior capsule portion 28 of the lens capsule 22. In this way, when treating secondary cataracts by laser irradiation, the laser beam can be effectively prevented from focusing on the back surface member 14, and the back surface member 14 can be effectively prevented from being damaged by the laser light. becomes possible.
更にまた、前記実施例では、レンズ部材１２が平凸レン
ズ形状とされていたが、このレンズ部材１２は、両凸レ
ンズ形状としてもよく、またメニスカス形状としてもよ
い。Furthermore, in the embodiment described above, the lens member 12 has a plano-convex lens shape, but the lens member 12 may have a biconvex lens shape or a meniscus shape.
ただし、水晶体嚢２２内への挿入時に粘性物質を使用す
る場合のように、粘性物質の表面張力乃至は粘着力でレ
ンズ部材１２と背面部材１４が密着する恐れがある場合
には、それを防止するために、例えばレンズ部材１２と
してメニスカス形状のものを用いて、レンズ部材１２と
背面部材１４との間に隙間ができるようにすることが望
ましく、またレンズ部材１２として平凸レンズ形状や両
凸レンズ形状のものを採用する場合には、レンズ部材１
２と背面部材１４の互いに対向する面の少なくとも一方
の外周部に突起部を設けて、レンズ部材１２と背面部材
１４との間に所定の隙間ができるようにすることが望ま
しい。However, if there is a risk that the lens member 12 and the back member 14 may come into close contact with each other due to the surface tension or adhesive force of the viscous material, such as when a viscous material is used when inserting it into the lens capsule 22, this can be prevented. In order to do this, it is desirable to use a meniscus-shaped lens member 12, for example, to create a gap between the lens member 12 and the back member 14, and also to use a plano-convex lens shape or a biconvex lens shape as the lens member 12. When adopting lens member 1,
It is desirable to provide a protrusion on the outer periphery of at least one of the mutually opposing surfaces of the lens member 12 and the back member 14, so that a predetermined gap is created between the lens member 12 and the back member 14.
加えて、保持部としての背面部材１４は、前記実施例の
眼内レンズ１０のように、光学レンズ部としてのレンズ
部材１２と略同様の直径と為すことが、水晶体嚢２２へ
の眼内レンズ１０の挿入時において、水晶体嚢２２の切
開部を必要以上に大きくしない上で、また水晶体嚢２２
内のセット位置に眼内レンズ１０を安定して保持する上
で望ましいが、水晶体嚢２２内への挿入時および挿入後
において、水晶体嚢２２を傷付けることなく、眼内レン
ズ１０をそのセット位置に安定して保持できる直径であ
れば、必ずしもレンズ部材１２と同等の直径に限定され
るものではない。In addition, like the intraocular lens 10 of the embodiment described above, the back member 14 serving as a holding portion has a diameter that is approximately the same as that of the lens member 12 serving as an optical lens portion. 10, the incision of the lens capsule 22 should not be made larger than necessary, and the lens capsule 22 should be
It is desirable to stably hold the intraocular lens 10 in the set position within the lens capsule 22, but it is desirable to hold the intraocular lens 10 in the set position without damaging the lens capsule 22 during and after insertion into the lens capsule 22. The diameter is not necessarily limited to the same diameter as the lens member 12 as long as it can be stably held.
その他、具体例を一々列挙することは割愛するが、本発
明が、その趣旨を逸脱しない範囲内において、種々なる
変更、修正、改良等を施した態様で実施できることは、
言うまでもないところである。In addition, although it is omitted to list specific examples one by one, the present invention can be implemented with various changes, modifications, improvements, etc. without departing from the spirit thereof.
It goes without saying.
（発明の効果）以上の説明から明らかなように、本発明に従う眼内レン
ズによれば、水晶体内に挿入・セットされるレンズ本体
だけの極めて簡単な構造で、注目物体までの距離に応じ
て、レンズの焦点距離を実質的に調節することができる
のであり、そのように、自動焦点調節機能を極めて簡単
な構造で実現し得るようにしたところに、本発明の大き
な工業的意義が存するのである。(Effects of the Invention) As is clear from the above description, the intraocular lens according to the present invention has an extremely simple structure consisting of only the lens body inserted and set in the crystalline lens, and the intraocular lens according to the , the focal length of the lens can be substantially adjusted, and the great industrial significance of the present invention resides in that the automatic focus adjustment function can be realized with an extremely simple structure. be.
第１図は、本発明に従う眼内レンズの一例を示す平面図
であり、第２図はその正面図であり、第３図は、第１図
の眼内レンズの水晶体嚢内へのセット状態を示す説明図
である。第４図は、本発明に従う眼内レンズの別の一例
を示す第１図に相当する図であり、第５図は、第４図の
眼内レンズの一部切欠正面図である。第６図乃至第８図
は、それぞれ、本発明に従う眼内レンズの更に異なる例
を概略的に示す正面図である。第９図は、本発明に従う
眼内レンズの保持部として採用可能な背面部材の一例を
示す斜視図であり、第１０図は、同じく、保持部として
採用可能な背面部材の更に異なる一例を示す断面図であ
る。第１１図は、従来の眼内レンズの一例を示す平面図
である。１０：眼内レンズ１２：レンズ部材（光学レンズ部）１４：背面部材（保持部）１６：ループ部材（連結手段）２２：水晶体嚢 ２６：前嚢部２８：後嚢部
３０：毛様体３２：通孔（光透過許容部）第３図第５図１フ第６図第９図第１０図FIG. 1 is a plan view showing an example of an intraocular lens according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 shows a state in which the intraocular lens of FIG. 1 is set in the lens capsule. FIG. FIG. 4 is a diagram corresponding to FIG. 1 showing another example of the intraocular lens according to the present invention, and FIG. 5 is a partially cutaway front view of the intraocular lens of FIG. 4. 6 to 8 are front views schematically showing further different examples of intraocular lenses according to the present invention. FIG. 9 is a perspective view showing an example of a back surface member that can be used as a holder for an intraocular lens according to the present invention, and FIG. 10 is a perspective view showing a still different example of a back surface member that can also be used as a holder. FIG. FIG. 11 is a plan view showing an example of a conventional intraocular lens. 10: Intraocular lens 12: Lens member (optical lens part) 14: Back member (holding part) 16: Loop member (connecting means) 22: Lens capsule 26: Anterior capsule part 28: Posterior capsule part
30: Ciliary body 32: Through hole (light transmission permitting part) Figure 3 Figure 5 Figure 1 Figure 6 Figure 9 Figure 10
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27981388AJP2718961B2 (en) | 1988-11-04 | 1988-11-04 | Intraocular lens |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27981388AJP2718961B2 (en) | 1988-11-04 | 1988-11-04 | Intraocular lens |
| Publication Number | Publication Date |
|---|---|
| JPH02126847Atrue JPH02126847A (en) | 1990-05-15 |
| JP2718961B2 JP2718961B2 (en) | 1998-02-25 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27981388AExpired - Fee RelatedJP2718961B2 (en) | 1988-11-04 | 1988-11-04 | Intraocular lens |
| Country | Link |
|---|---|
| JP (1) | JP2718961B2 (en) |
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| JP2718961B2 (en) | 1998-02-25 |
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| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees | Free format text:JAPANESE INTERMEDIATE CODE: R250 | |
| S111 | Request for change of ownership or part of ownership | Free format text:JAPANESE INTERMEDIATE CODE: R313113 | |
| R350 | Written notification of registration of transfer | Free format text:JAPANESE INTERMEDIATE CODE: R350 | |
| LAPS | Cancellation because of no payment of annual fees |