CN106659566A - 有晶状体眼人工晶状体 - Google Patents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/16—Intraocular lenses
- A61F2/1601—Lens body having features to facilitate aqueous fluid flow across the intraocular lens, e.g. for pressure equalization or nutrient delivery
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
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- A61F2/161—Posterior chamber lenses for use in addition to the natural lenses of the eyes
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/16—Intraocular lenses
- A61F2/1613—Intraocular lenses having special lens configurations, e.g. multipart lenses; having particular optical properties, e.g. pseudo-accommodative lenses, lenses having aberration corrections, diffractive lenses, lenses for variably absorbing electromagnetic radiation, lenses having variable focus
- A61F2/1654—Diffractive lenses
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- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
- A61F2250/0053—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in optical properties
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Abstract
一种有晶状体眼人工晶状体,其被植入虹膜与晶状体之间,所述人工晶状体包括衍射光栅(5)和支承部(3),衍射光栅(5)配置于人工晶状体中央部(2)且形成有同心圆状的沟槽,支承部(3)配置于衍射光栅(5)的外侧且支承衍射光栅(5),在衍射光栅(5)的中心形成有孔(6)。
Description
技术领域
本发明涉及一种使用了衍射光栅的人工晶状体(透镜)的有晶状体眼人工晶状体(phakic intraocular lens)。
背景技术
有晶状体眼人工晶状体作为除了眼镜、隐形眼镜以外的矫正视觉疾病的一种手段而得到认知。作为该有晶状体眼人工晶状体,已知有植入虹膜与晶状体之间的人工晶状体(透镜)。
专利文献1中公开的有晶状体眼人工晶状体包括中央光学部分、周边触觉部分、以及具有前开口部和后开口部的贯通孔,沟槽设置在中央光学部的边界部或外侧。
现有技术文献
专利文献
专利文献1:日本特表2007-534360号公报
发明内容
发明要解决的问题
然而,在有晶状体眼人工晶状体中,在使用凸透镜的情况下,透镜的中央部分变厚,因此,若在凸透镜的中央部分开孔,则会使光学功能下降。
另外,在以往的有晶状体眼人工晶状体中,在瞳孔缩小的情况下,当孔不在中央而在周边时,会因虹膜形成堵塞而阻碍房水的流动。
本发明的目的在于提供一种能够使透镜(人工晶状体)的厚度变薄,能够改善房水的流动的有晶状体眼人工晶状体。
用于解决问题的手段
为了解决上述问题,本发明的有晶状体眼人工晶状体是一种植入虹膜与晶状体之间的有晶状体眼人工晶状体,其包括衍射光栅和支承部,所述衍射光栅配置于人工晶状体(透镜)中央部且形成有同心圆状的沟槽,所述支承部配置于所述衍射光栅的外侧且支承所述衍射光栅;在所述衍射光栅的中心形成有孔。
附图说明
图1是示出本发明实施例1的有晶状体眼人工晶状体的结构的图。
图2是本发明实施例1的具备有晶状体眼人工晶状体的眼的侧面截面图。
图3是示出本发明实施例1的有晶状体眼人工晶状体中具备的形成有沟槽的衍射光栅的概略结构的图。
图4是用于说明本发明实施例1的有晶状体眼人工晶状体中具备的形成有锯齿状沟槽的衍射光栅产生的单焦点的图。
图5是示出图4所示的形成有锯齿状沟槽的衍射光栅的细节的图。
图6是用于说明以往的有晶状体眼人工晶状体中具备的形成有锯齿状沟槽的衍射光栅产生的两个焦点的图。
图7是示出以往的有晶状体眼人工晶状体中具备的形成有锯齿状沟槽的衍射光栅的细节的图。
图8是示出根据本发明实施例2的有晶状体眼人工晶状体的结构的图。
具体实施方式
下面,参照附图详细地描述本发明实施例1的有晶状体眼人工晶状体。
(实施例1)
图1是示出本发明实施例1的有晶状体眼人工晶状体的结构的图。本发明实施例1的有晶状体眼人工晶状体1中由胶原蛋白的聚合物材料、胶原聚合物(Collamer)构成,植入虹膜与晶状体之间。有晶状体眼人工晶状体1包括:配置于人工晶状体的中央部2且形成有同心圆状沟槽的衍射光栅5,以及配置于衍射光栅外侧且支承衍射光栅5的支承部3。
4a和4b是有晶状体眼人工晶状体的标记(marking),设置在人工晶状体的中央部2的外侧。
在衍射光栅5的中心形成有一个圆状的孔6,孔6的直径是0.25mm至0.5mm。
图2是示出本发明实施例1的具备有晶状体眼人工晶状体的眼的侧面截面图。如图2所示,眼8具有角膜9、晶状体10、虹膜11、前房13和后房14。有晶状体眼人工晶状体1被植入虹膜11与晶状体10之间。在有晶状体眼人工晶状体1与晶状体10之间设置有间隙12。后房14中具有的房水会通过间隙12和衍射光栅5的孔6流向前房13。
图3是示出本发明实施例1的有晶状体眼人工晶状体中具备的形成有沟槽的衍射光栅的概略结构的图。在图3中,沟槽是缝隙,并示出衍射光栅的基本结构。
如图3所示,在衍射光栅5中形成有同心圆状沟槽5a至沟槽5d。沟槽5a至沟槽5d设置成离衍射光栅5的中心越远则沟槽与沟槽的间隔越小。即,沟槽5b与沟槽5c的间隔设置成小于沟槽5a与沟槽5b的间隔,沟槽5d与沟槽5c的间隔设置成小于沟槽5b与沟槽5c的间隔。从衍射光栅5的中心O到同心圆状的各个沟槽5a至沟槽5d的高度h用式(1)表示:
h=(2Rmλ)1/2 (1)
在此,λ是光的波长,m是整数,R是衍射光栅5的中心O到焦点P的距离。M为1时的高度h是从中心O到沟槽5a的距离。m为2时的高度h是从中心O到沟槽5b的距离。接下来,m为3以上时的高度h依前述类推。
图4是用于说明本发明实施例1的有晶状体眼人工晶状体中具备的形成有锯齿状沟槽的衍射光栅产生的单焦点的图。图5是示出图4所示的形成有锯齿状沟槽的衍射光栅的细节的图。
为了使衍射光栅5具有透镜作用,在沟槽形成有锯齿状部5A至锯齿状部5C。锯齿状部5A至锯齿状部5C形成为同心圆状,并设置成锯齿状部5B的宽度小于锯齿状部5A的宽度、锯齿状部5C的宽度小于锯齿状部5B的宽度。
设定锯齿状部5A至锯齿状部5C各部的折射率为nL,设定除了锯齿状部5A至锯齿状部5C以外区域的折射率为nW。为了延迟光的行进,将折射率nL设定为大于1。
图4中示出的形成有锯齿状沟槽的衍射光栅5使所有相位集中而获得单焦点P。为了获得该焦点P,如图5所示,需要将通过例如锯齿状部5B的上方和下方的光正好错开一个波长。即,根据长度×折射率=光程长,式(2)成立:
D(nL-nW)=λ (2)
在此,若设定λ为0.546μm(e线)、nL为1.46(透镜的折射率)、nW为1.336(房水的折射率),则高度D是4.4μm。锯齿状部5A至锯齿状部5C的各锯齿状部的高度D也是4.4μm。
图6是用于说明以往的有晶状体眼人工晶状体中具备的形成有锯齿状沟槽的衍射光栅产生的两个焦点的图。图7是示出以往的有晶状体眼人工晶状体中具备的形成有锯齿状沟槽的衍射光栅的细节的图。
在图6中,在沟槽形成锯齿状部5-1至锯齿状部5-3。为了形成两个焦点,对于锯齿状部5-1至锯齿状部5-3不进行全部的相位集中。平行射出的光加强,使高度D降低,由此使叠加的光强度减弱。对于高度D而言,若对两个焦点分配的强度比例为5∶5,则式(3)成立:
D(nL-nW)=0.5λ (3)
若将两个焦点的折射率nL、nW和波长λ设定为与单焦点的折射率nL、nW和波长λ相同,则高度D是2.2μm。即,图4所示的锯齿状部5A至锯齿状部5C各个锯齿状部的高度为D,而图6所示的锯齿状部5-1至锯齿状部5-3各个锯齿状部的高度则为D/2。
这样,基于实施例1所构成的有晶状体眼人工晶状体1,在人工晶状体的中央部2配置了形成有同心圆状沟槽的衍射光栅5,因此衍射光栅5作为凸透镜发挥功能,可以使有晶状体眼人工晶状体1的厚度变薄。由此,可以在人工晶状体的中央部2所形成的衍射光栅5的中心容易地开出孔6。另外,由于衍射光栅5较薄,因此有晶状体眼人工晶状体的光学功能不会降低。
另外,在衍射光栅5中心开出的孔6位于虹膜11与晶状体10之间的瞳孔的位置。因此,房水会容易地由后房14经由间隙12通过在衍射光栅5中心开出的孔6流入前房13。由此,能够使房水的流动得到改善。另外,即使设置有孔6,也能够获得与没有孔6时的光学特性基本相同的光学特性。
另外,衍射光栅5设定为离衍射光栅5的中心越远则沟槽的间隔越小,在沟槽形成有锯齿状部5A至锯齿状部5C,锯齿状部5A至锯齿状部5C的高度D根据式(2)调整为预定值,因此能够形成单焦点。从而,有晶状体眼人工晶状体的光学功能就不会下降。
(实施例2)
图8示出本发明第2实施例的有晶状体眼人工晶状体的结构的图。图8示出的本发明第2实施例的有晶状体眼人工晶状体的特征是在衍射光栅5的中心附近设置有孔6a、孔6b、孔6c三个孔。
孔6a、孔6b、孔6c三个孔设置在相对于衍射光栅5的中心的直径1.5mm以内,且孔6a、孔6b、孔6c各个孔的直径是0.1mm。
这样在衍射光栅5的中心附近设置孔6a、孔6b、孔6c三个孔时,也可以获得与实施例1的有晶状体眼人工晶状体的效果相同的效果。
在实施例2中,在相对于衍射光栅5的中心的直径1.5mm以内设置了三个孔,但是,例如,也可以在相对于衍射光栅5的中心的直径1.5mm以内设置两个孔。在这种情况下,两个孔各自的直径为0.15mm。
即,要设置成使在设置多个孔时的各个孔的面积总和小于或等于在设置一个孔时的孔的面积。
工业实用性
本发明可以适用于植入虹膜与晶状体之间的人工晶状体。
Claims (3)
1.一种植入虹膜与晶状体之间的有晶状体眼人工晶状体,包括:
衍射光栅,其配置于所述有晶状体眼人工晶状体的中央部且形成有同心圆状的沟槽;以及
支承部,其配置于所述衍射光栅的外侧且支承所述衍射光栅,
在所述衍射光栅的中心形成有孔。
2.根据权利要求1所述的有晶状体眼人工晶状体,所述孔的直径是0.25mm至0.5mm。
3.根据权利要求1或2所述的有晶状体眼人工晶状体,所述衍射光栅设定成离所述衍射光栅的中心越远则所述沟槽的间隔就越小,通过在所述沟槽形成锯齿状部并将所述锯齿状部的高度调整为预定值来形成单焦点。
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EP (1) | EP3173050B1 (zh) |
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Also Published As
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WO2016013121A1 (ja) | 2016-01-28 |
EP3173050A4 (en) | 2018-04-04 |
US11166807B2 (en) | 2021-11-09 |
KR20170024009A (ko) | 2017-03-06 |
US20170216019A1 (en) | 2017-08-03 |
RU2650208C1 (ru) | 2018-04-11 |
ES2775599T3 (es) | 2020-07-27 |
EP3173050B1 (en) | 2020-02-19 |
US20190183634A1 (en) | 2019-06-20 |
JPWO2016013121A1 (ja) | 2017-04-27 |
KR101840612B1 (ko) | 2018-03-20 |
EP3173050A1 (en) | 2017-05-31 |
CN106659566B (zh) | 2018-06-12 |
JP6263266B2 (ja) | 2018-01-17 |
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