JP6016490B2 - Intraocular lens - Google Patents

Description

  The present invention relates to an intraocular lens, and more particularly to an intraocular lens to be mounted in a lens capsule.

  Cataract is known as a disease relating to the human eye. This “cataract” is a disease that causes a decrease in visual acuity and the like due to white turbidity of the lens that performs the lens function inside the eyeball.

  Cataract surgery and intraocular lens implantation have been performed to restore the visual acuity of patients who have developed this cataract. The above-mentioned operation is an operation in which a white and cloudy lens is removed and an artificial intraocular lens (IOL) is inserted therein.

  An intraocular lens transplanted into the eye by intraocular lens transplantation is composed of a lens body having a lens function instead of a crystalline lens and a support portion that supports the lens body. This type of intraocular lens is most preferably housed in the capsular bag that remains after the lens is removed. As a result, normal visual acuity can be ensured by an intraocular lens instead of a white cloudy crystalline lens.

  However, even if normal vision is ensured by the intraocular lens, the patient may develop secondary cataracts (PCO). Lateral cataract is a lens epithelial cell (LEC: Lens Epithelial Cells) that migrates to the back side of the lens body after the intraocular lens transplantation described above, and becomes fibrotic or proliferates and stratifies. It is a complication that develops due to the opacification of the opposite lens capsule (ie, posterior capsule).

Various techniques are known for suppressing the subsequent cataract.
For example, in patent document 1, the ring-shaped protrusion is formed in one surface of the optical part in an intraocular lens. By placing the intraocular lens in the capsular bag, the ridge presses the posterior capsule of the capsular bag. This prevents lens epithelial cells from migrating to the posterior capsule.
Moreover, in patent document 2, the artificial lens kit for mounting | wearing an intraocular lens is prepared separately. [0060] describes that a groove or hole for allowing aqueous humor to circulate is formed in the anterior capsule side ring and the posterior capsule side ring in the artificial lens kit. It is described that by adopting this configuration, aqueous humor (referred to herein as “aqueous humor”) circulates in the lens capsule, and as a result, lens epithelial cells are not regenerated.
On the other hand, Patent Document 3 describes a technique after a subsequent cataract has occurred. More specifically, when a subsequent cataract develops, the posterior capsule needs to be incised. In this incision, a surgical laser is used. At that time, the surgical laser may be accidentally irradiated onto the intraocular lens, and an unintended recess may be formed in the intraocular lens. To prevent this, two spatial tabs are provided on the intraocular lens. Moreover, wrinkles can be prevented from being formed in the posterior capsule by these two space tabs.

JP-A-8-257046 JP 2003-235881 A JP-A-61-85939

However, in the prior art, there are still many points to be improved.
For example, in the technique described in Patent Document 1, a protrusion is formed over the entire circumference of the peripheral portion of the optical unit. For this reason, the aqueous humor is not sufficiently circulated between the optical part and the posterior capsule.
In the technique described in Patent Document 2, the intraocular lens and the artificial lens kit are originally formed separately. Furthermore, although it has been described that aqueous humor circulates in the capsular bag, it is only in the capsular bag.
In addition, the technique described in Patent Document 3 is premised on the later occurrence of secondary cataract. Although such a technique is necessary, there is an increasing demand for a technique for preventing secondary cataracts in the first place.

  Therefore, a main object of the present invention is to provide an intraocular lens that suppresses the risk of developing subsequent cataract by sufficiently circulating aqueous humor between the lens capsule and the lens capsule.

  As described above, various intraocular lenses have been developed for secondary cataracts. The present inventors first examined a technique for preventing secondary cataracts from developing in the first place. As a specific mechanism, we focused on the mechanism of circulating aqueous humor in the capsular bag so that lens epithelial cells are not regenerated. However, as in Patent Document 2, it was speculated that if the circulation of the aqueous humor was completed in the lens capsule, the onset of the subsequent cataract could not be sufficiently suppressed.

  As a result, the present inventors have used two circulatory mechanisms, “circulation mechanism between the lens capsule and the lens capsule” and “circulation mechanism in the lens capsule”, which have never been considered before, in the intraocular lens. I got the knowledge to install.

Note that Patent Document 3 is a technique based on the premise that after cataract has developed as described above. Therefore, the above knowledge is not disclosed at all.
Further, the intraocular lens described in Patent Document 3 has a positioning hole at a position close to the outer periphery. This positioning hole is used to position the intraocular lens while inserting an IOL hook or the like when inserting the intraocular lens into the crystalline lens capsule, so that the intraocular lens can be rotated. To make it easier, it should be located as close to the outermost periphery of the lens body as possible. However, if this is the case, after the intraocular lens is inserted, if the lens capsule shrinks following the shape of the intraocular lens and the lens body is covered by the anterior capsule, the positioning hole is likely to close.

  As described above, the technique described in Patent Document 3 is specific in terms of the technical idea that the two circulation mechanisms, “circulation mechanism between the lens capsule and the lens capsule” and “circulation mechanism in the lens capsule”. It is completely different in the sense of a simple structure.

Aspects of the present invention based on the above findings are as follows.
The first aspect of the present invention is:
An intraocular lens to be inserted into the lens capsule, provided with a lens body having a lens function, a support part for supporting the lens body in the lens capsule, and in contact with the posterior capsule to separate the lens body from the posterior capsule An intraocular lens comprising a protruding portion,
A first circulation mechanism is provided between the outside of the capsular bag and the inside of the capsular bag, through which the aqueous humor can circulate through the intracapsular / external communication portion provided in the lens body; and
A second circulation in which the aqueous humor can circulate in the lens capsule through the intracapsular communication portion provided in the protrusion between the lens body and the posterior capsule and the other region. An intraocular lens characterized in that a mechanism is provided.
According to a second aspect of the present invention, in the invention according to the first aspect,
When the intraocular lens is inserted into the lens capsule, the lens capsule separates between the lens capsule and the lens capsule by attaching the anterior capsule formed with a hole and the lens body, and The region between the lens main body and the posterior capsule and the other region in the lens capsule are separated by the protrusion.
According to a third aspect of the present invention, in the invention according to the first or second aspect,
The first circulation mechanism has a first through hole provided in the lens body, and at least between a region between the lens body and the posterior capsule in the lens capsule and outside the lens capsule. The aqueous humor is free to circulate,
The second circulation mechanism has any one of a notch and a second through hole provided in the projecting portion.
According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects,
After the intraocular lens is inserted, the first through hole is disposed at a position where the first through hole is not blocked by the anterior capsule when the anterior capsule is attached to the main surface of the lens body. It is characterized by that.
According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects,
The protruding portion is provided along the outer periphery of the lens body, and protrudes to the extent that the posterior capsule does not contact the lens body.
According to a sixth aspect of the present invention, in the invention according to the fifth aspect,
The protrusion protrudes in the thickness direction of the lens body from 0.5 mm to 3 mm from the boundary between the lens body and the protrusion before being inserted into the lens capsule. The seventh aspect of the invention is:
An intraocular lens to be inserted into the capsular bag, a lens body having a lens function, a support portion for supporting the lens body in the capsular bag, and an outer periphery of the lens body to separate the lens body from the posterior capsule An intraocular lens comprising a provided protrusion,
When the intraocular lens is inserted into the lens capsule, the lens capsule separates between the lens capsule and the lens capsule by attaching the anterior capsule formed with a hole and the lens body, and The region between the lens body and the posterior capsule in the lens capsule and the other region are separated by the protrusion,
A first circulation mechanism is provided between the outside of the lens capsule and inside the lens capsule, through which the aqueous humor can circulate via the lens body; and
A second circulatory mechanism is provided in the capsular bag, between the region between the lens body and the posterior capsule and the other region, through which the aqueous humor can circulate through the protrusion,
The first circulation mechanism has a first through hole provided in the lens body, and after inserting an intraocular lens, the main surface of the lens body and the anterior capsule come into contact with each other. By disposing the first through hole closer to the center side from the outer periphery of the lens body to the extent that the first through hole is not blocked by the anterior capsule, at least the lens body and the posterior capsule in the lens capsule Aqueous humor can circulate freely between the area between and outside the lens capsule,
The second circulation mechanism has either one of a notch and a second through hole provided in the protrusion,
The protrusion protrudes in the thickness direction of the lens body from 0.5 mm to 3 mm from the boundary between the lens body and the protrusion before being inserted into the lens capsule. It is an inner lens.

  ADVANTAGE OF THE INVENTION According to this invention, the onset risk of secondary cataract can be suppressed by fully circulating aqueous humor between the lens capsule and the lens capsule.

(A) It is the schematic which shows the cross-section of an eyeball. (B) It is the cross-sectional schematic for demonstrating a mode that aqueous humor circulates in the eye. It is the schematic which shows the intraocular lens in this embodiment. (A) is a top view, (b) is a side view when it sees from the arrow A of (a). It is the schematic which shows the intraocular lens in this embodiment. (A) is sectional drawing in B-B 'of Fig.2 (a), (b) is sectional drawing in C-C'. It is the schematic which shows the usage method of the intraocular lens in this embodiment. (A) is sectional drawing which shows a mode immediately after insertion of an intraocular lens. (B) is a top view which shows a mode that the front capsule adhered to the front surface of the lens main body for a while after (a). (C) is sectional drawing which shows a mode after an anterior capsule united with the front surface of the lens main body. However, for convenience of explanation, a part of the intraocular lens is viewed from the side.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the present embodiment, description will be given in the following order.
1. Structure of eyeball A) Overall structure of eyeball B) Lens C) Lens capsule D) Circulation of aqueous humor 2. Intraocular lens A) Overall structure of intraocular lens B) Lens body a) Optical part b) Internal / external communication part c) Sac deposition target part C) Protrusion part D) Support part Intraocular lens usage (mechanism)
4). 4. Effects of the embodiment Other

<1. Eyeball Structure>
Here, prior to the description of the intraocular lens according to the present invention, the structure of the eyeball in which the intraocular lens is used will be described with reference to FIG. FIG. 1A is a schematic diagram showing a cross-sectional structure of an eyeball. FIG. 1B is a schematic cross-sectional view for explaining how aqueous humor circulates in the eye.

A) Overall Structure of Eyeball As shown in FIG. 1A, the eyeball 101 is entirely spherical, and is covered and protected by the sclera 103 except for the front cornea 102 portion. The space from the cornea 102 to the surface of the iris 106 is called the anterior chamber 105, and the space from the back surface of the iris 106 to the lens is called the posterior chamber. These spaces are filled with a bodily fluid called aqueous humor.

  A regular circular hole formed by the iris 106 is called a pupil 107, and functions to adjust the amount of light incident on the inside of the eyeball 101 by adjusting its size. A crystalline lens 111 is present behind the iris 106. There is a vitreous body 113 behind the lens, and there is a retina 112 that converts light incident into the eye into a signal and transmits it to the brain.

B) Lens The lens 111 is colorless and transparent and has a convex lens shape, and is covered with a thin film called a lens capsule 108. The crystalline lens is connected to the ciliary body 110 through the capsular bag 108 and the ciliary band 109 (Chin band). The ciliary body 110 has ciliary muscles and controls the thickness of the crystalline lens 111 to perform focusing. That is, when looking close, the ciliary body 110 contracts and the ciliary band 109 relaxes, so that the crystalline lens 111 becomes thick, and the refractive power of the crystalline lens 111 increases so that the near can be seen. On the other hand, it is considered that the ciliary body 110 relaxes when the distance is viewed, and the ciliary band 109 is pulled, so that the crystalline lens 111 becomes thin, and the refractive power of the crystalline lens 111 decreases, so that the distant place can be seen. .

C) Lens capsule The lens capsule 108 is a film-like structure rich in elasticity. Hereinafter, the portion of the lens capsule 108 on the outer side of the eye (that is, the cornea 102 side) when viewed from the lens equator line E is referred to as “anterior capsule”, and the portion of the eye that is viewed from the lens equator line E (that is, the retina 112 side) Called the “posterior capsule”.

D) Circulation of aqueous humor As shown in FIG. 1 (b), aqueous humor is secreted from the ciliary protrusion 110 a in the ciliary body 110. Then, it passes between the lens capsule 108 and the iris 106 to reach the anterior chamber, and the aqueous humor is discharged from the Schlemm's canal 118b via the trabecular meshwork 118a.

<2. Intraocular lens>
Next, the intraocular lens will be described. It is assumed that the intraocular lens in the present embodiment is attached after the lens 111 is removed by the cataract operation of the eyeball.

A) Overall Structure of Intraocular Lens FIG. 2 is a schematic diagram showing an intraocular lens in the present embodiment. (A) is a top view, (b) is a side view when it sees from the arrow A of (a). FIG. 3 is a similar schematic diagram. (A) is sectional drawing in BB 'of Fig.2 (a), (b) is sectional drawing in CC'.

  As shown in FIG. 2A, the intraocular lens 1 is provided along the outer periphery of the lens body 2 so as to separate the lens body 2 from the posterior capsule and the lens body 2 having a substantially circular shape in plan view. The projecting portion 3 and two arm-like and wire-like support portions 4 extending from the outer peripheral portion of the lens body 2 are provided.

  In addition, as shown in FIG.2 (b), the protrusion part 3 is provided in order to separate the lens main body 2 (especially optical part 21) from a back capsule. Furthermore, the protruding portion 3 is provided to contact the posterior capsule as a substitute for the lens body 2. Further, the region between the lens body 2 and the posterior capsule in the lens capsule 108 is separated from other regions by the presence of the protrusion 3. A region between the lens body 2 and the posterior capsule is also referred to as a “lens lower region”. The region other than the “lens lower region” in the lens capsule 108 is also referred to as “region other than the lens lower region” or simply “other region”.

  In the present embodiment, the lens body 2, the protruding portion 3, and the support portion 4 are all made of a soft material (soft acrylic). And each is integrally formed.

B) Lens body The lens body 2 in the present embodiment is located at the approximate center O of the entire intraocular lens 1, and the shape thereof is a circular or elliptical part in plan view. In the lens body 2 in the present embodiment, an optical part 21 and an intracapsular / external communication part 22 are formed from a circular center toward the outer periphery. The optical part 21 is a part having a lens function. A sac deposition scheduled portion 23 is formed on the outermost peripheral portion of the lens body 2. In addition, when the intraocular lens 1 is inserted into the capsular bag 108, in the lens body 2 having the opposing main surface, the surface on the cornea 102 side is referred to as “front surface”, and the surface on the retina 112 side is referred to as “rear surface”. say.

a) Optical part The optical part 21 has a predetermined refractive power. This refractive power is to give the focal length desired by the wearer instead of the lens after removing the cataract lens. That is, when the intraocular lens 1 is inserted into the crystalline lens capsule 108 and light from outside the eye passes through the optical unit 21, the wearer of the intraocular lens 1 can obtain a desired focal length. This is a so-called lens function. FIG. 3 shows a case where both the front surface and the rear surface of the intraocular lens 1 (particularly the optical unit 21) have a convex shape.

b) Internal / external communication portion In the present embodiment, the internal / external communication portion 22 is provided on the outer peripheral portion of the optical unit 21. The aqueous humor can circulate between the outside of the lens capsule 108 and the inside of the lens capsule 108 via the intracapsular / external communication portion 22 provided in the lens body 2.

  In the present specification, the intracapsular / external communication portion 22 is referred to as a first circulation mechanism. As for the internal / external communication part 22, the through-hole 22b is specifically mentioned. In the present embodiment, the through hole 22b has openings on the front surface and the rear surface of the lens body 2 and penetrates the lens body 2 in the thickness direction (optical axis direction). By virtue of this through-hole 22b, it becomes possible to circulate the aqueous humor at least between the lens lower region in the lens capsule 108 and the outside of the lens capsule 108.

  As shown in FIGS. 2 and 3A, a groove 22c extending from the opening 22a to the outermost periphery of the lens body 2 may be formed together with the through hole 22b. The aqueous humor can circulate between the outside of the lens capsule 108 and the lower lens region by the through-hole 22b, and the aqueous humor can also circulate between the outside of the lens capsule 108 and the region other than the lower lens region by the groove 22c. It becomes.

In this specification, the “through hole 22b” is an “opening 22a” formed on the front surface of the lens body 2, and is a hole formed by passing the lens body 2 through the opening 22a. Refers to that.
Further, the “groove 22 c” refers to a structure that is open on the front surface of the lens body 2 but does not penetrate the lens body 2. Therefore, when the groove 22c is provided, the aqueous humor outside the lens capsule 108 travels along the groove 22c to the region near the side surface of the lens body 2 in the lens capsule 108 (that is, a part of the region other than the lens lower region). Flows in. Or, conversely, aqueous humor flows out of the lens capsule 108 through the groove 22c and out of the lens capsule 108.
Whether it is “through hole 22b” or “groove 22c”, it has a structure in which the outside of the lens capsule 108 and the inside of the lens capsule 108 are communicated.

  In addition, although the through-hole 22b and the groove | channel 22c may be single or plural, it is preferable that a plurality of through-holes 22b and grooves 22c are provided in order to actively exchange aqueous humor inside and outside the lens capsule 108. In the present embodiment, the through hole 22b and the groove 22c are arranged to face each other across the center of the lens body 2. And eight through-holes 22b and grooves 22c are arranged at equal intervals in the circumferential direction.

c) Sac deposition plan part In this embodiment, as shown to Fig.2 (a), the annular | circular sac deposition plan part 23 is provided in the outermost periphery part of the intracapsular external communication part 22. As shown in FIG.
This sac deposition scheduled portion 23 is a space secured as a part where the anterior sac adheres to the lens body 2 after the above-described cataract surgery and intraocular lens 1 transplantation are performed. Note that “attaching” is also referred to as “adhering”. Accordingly, the “sac deposition planned part” may be rephrased as “sac adhesion planned part”.
After the above operation is performed, a part of the anterior capsule (the portion facing the lens body 2 in the anterior capsule) is excised by the above operation. Further, the lens 111 is removed from the lens capsule 108, and the intraocular lens 1 is present. Then, the lens capsule 108 contracts so as to cover the intraocular lens 1. As a result, when the intraocular lens 1 is inserted into the lens capsule 108, the anterior capsule in which a hole is formed and the lens body 2 are adhered to each other, whereby the lens body 2 is located between the lens capsule 108 and the lens capsule 108. It is classified by. More specifically, the lens body 2 covers the portion (hole) cut out in the anterior capsule. That is, when the lens body 2 covers the hole formed in the lens capsule 108 by the above operation, the outside of the lens capsule 108 and the inside of the lens capsule 108 are partitioned.

  By the way, in this specification, “partitioning” includes a state in which a certain region and a certain region are completely partitioned by a partition, and both regions are communicated with each other, and an incomplete partition is also included. . As this incomplete partition, the protrusion part 3 in which the notch 31b in the below-mentioned C) protrusion part exists is mentioned, for example.

  When the space between the outside of the lens capsule 108 and the inside of the lens capsule 108 is partitioned, even if the lens body 2 has a through-hole 22b serving as the inside / outside communicating portion 22, the inside / outside communicating portion 22 is blocked by the anterior capsule. There is also a possibility that it will be. Therefore, as in the present embodiment, the capsular attachment scheduled portion 23 is provided on the outermost peripheral portion of the lens body 2. By doing so, even if the anterior capsule adheres to the lens body 2 after the operation, the first circulation mechanism can be held.

  In addition, as a magnitude | size of the space (the width of the ring as said in this embodiment) ensured as the sac deposition part 23, if it is a magnitude | size which can hold | maintain a 1st circulation mechanism good. Furthermore, even if some of the plurality of through-holes 22b and grooves 22c are partially or completely blocked, the sac has a size that allows replacement of aqueous humor in the other through-holes 22b and grooves 22c. You may employ | adopt the deposition plan part 23. FIG. Further, “the through hole 22b is not blocked by the anterior capsule” in this specification refers to a case where all the through holes 22b are not completely blocked. Even if a part of the through-hole 22b is covered with the anterior capsule, or some of the multiple through-holes 22b are completely blocked by the anterior capsule, the first circulation mechanism can be maintained. If there is, the sac deposition scheduled part 23 may be made small, and the sac inside / outside communication part 22 may be provided near the outer periphery.

  As shown in FIG. 2 (a), the sac deposition scheduled part 23 may partially overlap with the intra-sac communication part 22. In the case of this embodiment, both the through hole 22b and the groove 22c are provided in the lens body 2. The groove 22c extends to the outermost periphery of the lens body 2. Therefore, the sac deposition scheduled portion 23 overlaps at least a part of the groove 22c. That is, when the anterior capsule adheres to the intraocular lens 1 after the operation, the anterior capsule covers a part of the groove 22c. However, if the opening 22a of the lens body 2 is not completely blocked by the anterior capsule, the inside and outside of the lens capsule 108 can be communicated with each other through the through hole 22b. Furthermore, if the opening 22a opened to the outside of the lens capsule 108 communicates with the groove 22c, the aqueous humor entering from the opening 22a can flow along the groove 22c. As a result, the aqueous humor outside the lens capsule 108 can pass under the covered front capsule and reach the region near the side surface of the lens body 2 in the lens capsule 108. Therefore, the state where the outside of the lens capsule 108 and the inside of the lens capsule 108 are communicated can be maintained.

  In the present embodiment, the intracapsular / external communication portion 22 is formed on the outer peripheral side of the optical portion 21. This is a treatment for preventing the internal / external communication part 22 from inhibiting the optical function exhibited by the optical part 21. If the intracapsular / external communication part 22 is present in the optical part 21, there is a possibility that the wearer of the intraocular lens 1 may reduce the amount of light in the region of the intracapsular / external communication part 22. On the other hand, if the intracapsular / external communication portion 22 exists in the vicinity of the outermost periphery of the lens body 2, the intracapsular / external communication portion 22 may be completely blocked by the anterior capsule as described above. Therefore, in the present embodiment, the capsular attachment scheduled portion 23 is provided in the outermost peripheral portion of the lens body 2, and the optical portion 21 is provided in the center of the lens body 2 while ensuring a certain amount of space, and desired optical characteristics. Has a structure that can be demonstrated without delay.

  In addition, as in this embodiment, in order for the lens body 2 to cover the hole formed in the anterior capsule during surgery, the diameter of the lens body 2 is larger than the diameter of the hole in the anterior capsule. Larger is preferable. Of course, even if the diameter of the hole in the anterior capsule is larger, the lens body 2 becomes a lid due to the contraction of the lens capsule 108, but not all edges of the anterior capsule incision part adhere to the lens body 2. In some cases, heterogeneous adhesion may occur, such as a part adhering to the lens body 2 and another part adhering to the posterior capsule. In such a case, since the force applied to the lens body 2 is inhomogeneous due to the contraction of the lens capsule 108, there is a risk that the fixing position of the lens body 2 may be tilted or escape from the lens capsule in some cases. The visual function of the wearer may be impaired. Further, when making a large hole in the anterior capsule, there is a risk of destroying the lens capsule 108 itself, which increases the difficulty of the operation. For this reason, making a large hole in the anterior capsule is generally avoided. Considering the above, it is better to set the diameter so that the lens body 2 can be used as a lid to some extent even immediately after the insertion of the intraocular lens 1.

C) Protruding portion In the present embodiment, the protruding portion 3 is provided along the outer periphery of the lens body 2 as shown in FIG. Specifically, the protruding portion 3 protrudes from the rear surface of the lens body 2 as a starting point. The protrusion 3 is provided so as to come into contact with the posterior capsule so as to separate the lens body 2 from the posterior capsule. Then, even if the lens capsule 108 contracts following the shape of the intraocular lens 1, the protrusion 3 protrudes with such a length that the posterior capsule does not contact the lens body 2. This protrusion 3 earns a distance between the rear surface of the lens body 2 and the posterior capsule.

  Of course, this protrusion part 3 also has the meaning of reducing the contact opportunity of the lens main body 2 and a back capsule. On the other hand, it has the meaning of circulating aqueous humor outside the lens capsule 108 in the lens capsule 108. Therefore, the protrusion 3 protrudes with a length that allows the aqueous humor to circulate in the lens capsule 108. If the length of the protrusion 3 is not sufficient, sufficient space cannot be secured between the lower lens region, that is, between the rear surface of the lens body 2 and the posterior capsule, and the aqueous humor is circulated less in the lower lens region. It will disappear. In order to prevent this, the protruding portion 3 has the length of the above-described degree.

  Further, as one of the features of the protruding portion 3 of the present embodiment, the second is such that the aqueous humor can circulate through the protruding portion 3 in the lens capsule 108 and between the lower lens region and the other region. It is mentioned that a circulation mechanism is provided.

  This second circulation mechanism is constituted by an intracapsular communication portion 31 provided in the protruding portion 3. Examples of the intracapsular communication part 31 include a through hole 31a and a notch 31b. Hereinafter, the through hole 22b of the first circulation mechanism in the lens body 2 is referred to as a “first through hole”, and the through hole 31a provided in the protruding portion 3 is referred to as a “second through hole”.

  If the protrusion 3 is simply provided along the outer periphery of the lens main body 2, the lower portion of the lens becomes a closed region due to the protrusion 3. In this case, even if the lens body 2 does not come into contact with the posterior capsule due to the projecting portion 3, if lens epithelial cells remain in the lens lower region when the intraocular lens 1 is installed, The lens epithelial cells may proliferate. However, in the present embodiment, the second circulation mechanism (the second through hole 31a and the notch 31b) is provided for the protruding portion 3. Thereby, it becomes possible to circulate the aqueous humor between the lens lower region and the other region via the intracapsular communication portion 31 provided in the protruding portion 3.

  By providing the second through hole 31a, the aqueous humor can be circulated in the lens capsule 108 between the lower lens region and the other region. A similar effect can be expected for the notch 31b. Further, by providing the notch 31b, the aqueous humor can be effectively circulated in the lens capsule, and further, the contact area between the protruding portion 3 and the posterior capsule can be reduced. .

  Even in the case where only the second through hole 31a is provided in the protrusion 3, and the protrusion 3 is a ring-shaped protrusion, the circulation in the lens capsule 108, and further, the lens capsule 108 by the first circulation mechanism It is certainly possible to carry out internal and external circulation. However, it is estimated that the flow of aqueous humor tends to stagnate in the vicinity of the contact portion between the protruding portion 3 and the posterior capsule as compared with other portions. Further, when the protruding portion 3 and the posterior capsule come into contact with each other, lens epithelial cells present around the contact portion cause a foreign body reaction, and lens epithelial cell degeneration and abnormal proliferation that cause secondary cataract are promoted.

Therefore, as shown in FIG. 2B and FIG. 3B, it is possible to promote circulation of the aqueous humor near the contact portion between the posterior capsule and the protruding portion 3 by providing the protruding portion 3 with a notch 31b. By reducing the contact area between the protrusion 3 and the posterior capsule, an effect of reducing the foreign body reaction of the lens epithelial cells can be expected.
Further, by providing the notch 31b, the intraocular lens 1 can be easily folded when the intraocular lens 1 is inserted into the crystalline lens capsule 108. For folding, see <3. As will be described later in connection with the use method (mechanism) of the intraocular lens, it can be folded at the notch 31b. By doing so, compared to the case where there is no notch 31b, the burden on the operator during the operation is reduced, and the risk of damaging the intraocular lens 1 during folding is also reduced.

  By the way, the end 32 along the contour of the notch 31b is formed in the projecting portion 3 by the notch 31b. In this case, the end 32 is preferably rounded. This is because the rounded one is less likely to damage the lens capsule 108 and other intraocular tissues when the intraocular lens 1 is inserted. In particular, it is preferable that the end portion in the vicinity of the portion in contact with the posterior capsule in the protruding portion 3 is rounded.

After the intraocular lens 1 is inserted into the lens capsule 108, the lens capsule 108 contracts and covers the intraocular lens 1. At that time, if the end portion 32 is rounded, the possibility that the posterior capsule is torn by the end portion 32 can be reduced. Moreover, as described above, the aqueous humor can be sufficiently circulated in the lower lens region and other regions even when the lens capsule 108 is contracted. As a result, the aqueous humor can be sufficiently circulated inside and outside the lens capsule 108.
Further, the contact area between the protruding portion 3 and the posterior capsule can be reduced by rounding the end portion 32, and a large space can be secured especially in the vicinity of the posterior capsule. By doing so, it is also possible to amplify the effect obtained by the notch 31b as described above.

  The second through hole 31a and the notch 31b may be singular or plural, but a plurality of the second through holes 31a and the notches 31b are provided in order to actively exchange the aqueous humor inside and outside the lens capsule 108. Is preferred. In the present embodiment, the notches 31b face each other with the lens body 2 interposed therebetween. And four notches 31b are arranged at equal intervals in the circumferential direction. Further, the second through hole 31a is provided in a portion located in the middle between the notches 31b. Further, the second through hole 31a is formed near the posterior capsule in the protruding portion 3 so as to promote the circulation of aqueous humor near the posterior capsule as much as possible.

  Note that the protruding portion 3 does not need to protrude straight in the thickness direction of the lens body 2. That is, the protrusion 3 may protrude in a direction having a certain inclination from the thickness direction of the lens body 2. After all, it is sufficient if the lens body 2 has a size that does not contact the posterior capsule, and it is preferable that the shortest distance from the boundary between the lens body 2 and the protruding portion 3 to the posterior capsule satisfies the above conditions. If the protruding portion 3 has a distance between the lens body 2 and the posterior capsule by the above range, a space having a size suitable for circulation of aqueous humor can be secured as the lower lens region.

  By the way, again, the technique described in Patent Document 3 is a technique premised on the later occurrence of secondary cataract. There is no disclosure about the idea of circulating aqueous humor in the lens capsule 108 as in the present invention. Therefore, in the case of the intraocular lens 1 described in Patent Document 3, even if a ridge (tab) is formed toward the posterior capsule with respect to the optical unit 21, the wrinkle of the posterior capsule can be extended. It doesn't matter. That is, it is considered that the protrusion (tab) of the intraocular lens 1 described in Patent Document 3 does not have a height enough to circulate the aqueous humor in the lens capsule 108. Similarly, as described in the knowledge of the present invention, there is no disclosure about the idea of circulating aqueous humor inside and outside the lens capsule 108.

  Note that the length of the protruding portion 3 is set such that the posterior capsule does not contact the lens body 2 even when the lens capsule 108 contracts. As a result, a sufficient space is naturally generated in the lower lens region. Then, in the lens capsule 108, the aqueous humor can naturally circulate sufficiently between the lower lens region and the other region. That is, in order for the second circulation mechanism to function in this embodiment, the length of the protrusion 3 is a length that can prevent the posterior capsule from contacting the lens body 2 when the lens capsule 108 contracts. It can be said that it is good.

D) Supporting portion As shown in FIG. 2 (a), in this embodiment, the supporting portion 4 is a part of the intraocular lens 1, and is opened from the lens body 2 into an open loop shape and two arms. It is the part that extends to the direction. As a material, a case where a soft material (soft acrylic) is used as in the lens body 2 will be described. In addition, the support part 4 of this embodiment has the base part 41, the support part main body 42, and the front-end | tip part 43. FIG.

  When the intraocular lens 1 is viewed in plan, the support portion 4 has a smoothly continuous contour from the vicinity of the boundary between the lens body 2 and the support portion 4 to the distal end portion 43. The lens body 2 and the support portion 4 are integrally molded. When the intraocular lens 1 is inserted into the lens capsule 108, the lens capsule 108 and the support portion 4 come into contact with each other, so that the lens body 2 is held in the lens capsule 108 via the support portion 4. become. That is, the support part 4 plays a role of supporting the lens body 2 in the lens capsule 108.

  The base portion 41 of the support portion 4 is formed to be wide at the foot of the mountain toward the center O of the lens body 2 when viewed in plan, and is connected to the lens body 2 at the widest portion. By doing so, it is possible to suppress the possibility that the boundary portion between the lens body 2 and the support portion 4 is damaged.

  The support body 42 extends from the base 41 to the outside so as to draw an arc obliquely outward from the base 41. The tip portion 43 is formed to be slightly wider than the support portion main body 42.

  The support portion main body 42 is a portion that connects the base portion 41 and the tip portion 43. As described above, the support portion main body 42 has a contour describing a smoothly continuous arc. The support portion main body 42 may have any size, but in the present embodiment, it is an arm-like portion having the same thickness.

  The tip part 43 is a part located at the tip of the arm-shaped support part 4 as the name suggests. The cross-sectional view shape and the most advanced portion of the distal end portion 43 are rounded so as not to damage the lens capsule 108 even if it contacts the lens capsule 108. Moreover, the cross-sectional view shape of the base part 41 and the support part main body 42 may be rounded.

<3. Usage of intraocular lens (mechanism)>
Hereinafter, a method of using the intraocular lens 1 in the present embodiment will be described with reference to FIG. FIG. 4 is a schematic view showing a method of using the intraocular lens 1 in the present embodiment. (A) is sectional drawing which shows a mode immediately after insertion of the intraocular lens 1. FIG. (B) is a top view which shows a mode that the front capsule adhered to the front surface of the lens main body 2 for a while after (a). (C) is a cross-sectional view showing a state after the anterior capsule has adhered to the front surface of the lens body 2. However, for convenience of explanation, a part of the intraocular lens 1 is viewed from the side.

  First, when inserting the intraocular lens 1 into the eye, as shown in FIG. 4A, a wound is created on the surface of the eyeball 101 prior to that, and a circular hole is formed in the crystalline lens capsule 108. Through this hole, the cloudy lens 111 (lens cortex, lens nucleus) in the lens capsule 108 is removed.

  A known method may be used when the lens 111 that has developed cataract is removed from the lens capsule 108. As an example, a small hole of about 6 mm (CCC: Continuous Curve Capsular Hexis or Continuous Circular Capsule Hexis) is formed in the anterior capsule of the lens capsule 108, and ultrasonic emulsification (PEA) is used.

  In addition, the intraocular lens 1 is folded small beforehand. At this time, the intraocular lens 1 is folded in such a manner that the lens body 2 is folded in two so that the two support portions 4 do not overlap each other. Insert this into the injector. Then, the distal end 43 of the injector to which the intraocular lens 1 is attached is inserted into the wound created on the surface of the eyeball 101 (for example, the boundary between the cornea 102 and the sclera 103), and is exposed to the hole formed in the anterior capsule. In this state, the intraocular lens 1 is pushed out from the injector. Then, the intraocular lens 1 is inserted into the lens capsule 108 through the hole in the anterior capsule.

  Next, the folded intraocular lens 1 is developed into its original shape. In addition, shape memory property may be imparted to the intraocular lens 1. By doing so, the intraocular lens 1 can be naturally deployed without using an insulator or the like, and the burden on the operator can be reduced. The lens capsule 108 contracts with the progress of the operation, and as shown in FIG. 4B, the anterior capsule adheres at the capsular attachment scheduled portion 23 on the front surface of the lens body 2.

  As shown in FIG. 4C, even after the lens capsule 108 is contracted, the first through hole 22b and the groove 22c on the front surface of the lens body 2 secure a space in the sac deposition scheduled portion 23. Thanks to being, it is not completely blocked. And the communication state inside and outside the lens capsule 108 can be maintained. Therefore, aqueous humor secreted from the ciliary body 110 flows into the lens lower region in the lens capsule 108 through the lens body 2. Specifically, aqueous humor outside the lens capsule 108 flows into the lower lens region in the lens capsule 108 through the first through hole 22b. Similarly, aqueous humor outside the lens capsule 108 flows along the groove 22c and flows into the region near the side surface of the lens body 2 in the lens capsule 108 (region other than the lens lower region) (first circulation mechanism).

  The aqueous humor flowing into the lens capsule 108 in this way circulates between the lens lower region in the lens capsule 108 and the other region via the protrusion 3 in this case. More specifically, the aqueous humor circulates in the lens capsule 108 via the second through hole 31a and the notch 31b of the protrusion 3 (second circulation mechanism).

  The aqueous humor circulated in the lens capsule 108 flows out of the lens capsule 108 from the lens capsule 108 through the first through hole 22b and the groove 22c. Then, it passes between the lens capsule 108 and the iris 106 to reach the anterior chamber 105, and the aqueous humor is discharged from the Schlemm's canal 118b through the trabecular meshwork 118a (first circulation mechanism).

  In the present embodiment, in the first circulation mechanism, the outside of the lens capsule 108 and the lower lens region are communicated with each other. At the same time, in the second circulation mechanism, the lens lower region and the other region are communicated with each other in the lens capsule 108. That is, when the aqueous humor circulates, the lower region of the lens is the confluence of the aqueous humor, that is, the intersection of the inflow and out of the aqueous humor. In this embodiment, it has a great meaning to make the lower lens region an intersection of inflow and outflow of aqueous humor.

  As described above, the flow of aqueous humor tends to stagnate in the vicinity of the contact portion between the protruding portion 3 and the posterior capsule as compared with other portions. In particular, the vicinity of the contact portion between the protrusion 3 and the posterior capsule in the lower region of the lens is divided by the protrusion 3 while the space between the lens body 2 and the posterior capsule is narrow. For this reason, it is considered that the flow of aqueous humor tends to stagnate particularly in the lower lens region. Then, it is considered that lens epithelial cells are likely to proliferate in this portion.

  Therefore, by setting the lower lens region including the vicinity of the contact portion between the protrusion 3 and the posterior capsule as an intersection of the inflow and outflow of the aqueous humor, the intraocular lens has a relatively turbulent flow. 1 is configured. As a result, a stable state in which the lens epithelial cells adhere to the posterior capsule and proliferate is less likely to occur. The protrusion 3 in the present embodiment is not only “provides a sufficient space between the lens body 2 and the posterior capsule”, “sufficiently circulates the aqueous humor”, It also plays the role of “generating turbulence”. By doing so, it becomes possible not to create an environment in which the lens epithelial cells easily proliferate, and as a result, the risk of developing cataracts can be significantly reduced.

<4. Advantages of the embodiment>
In the present embodiment, the aqueous humor can be circulated inside and outside the lens capsule 108. Moreover, it has two circulation mechanisms, “the circulation mechanism between the lens capsule 108 and inside the lens capsule 108 (first circulation mechanism)” and “the circulation mechanism in the lens capsule 108 (second circulation mechanism)”. This can be achieved simply by providing the intraocular lens 1. By such two patterns of circulation, the aqueous humor can be exchanged efficiently inside and outside the lens capsule 108.

  As described above, in the present embodiment, the risk of developing subsequent cataract can be suppressed by sufficiently circulating the aqueous humor between the lens capsule 108 and the lens capsule 108 and within the lens capsule 108.

<5. Other>
The present invention is not limited to the contents of the above-described embodiment, and can be appropriately changed without departing from the gist thereof.

(First circulation mechanism)
In the above-described embodiment, the case where both the first through hole 22b and the groove 22c are provided as the first circulation mechanism has been described. On the other hand, the idea of the present invention can be applied even when one of the first through hole 22b and the groove 22c is provided as the first circulation mechanism.

  In the case where only the first through hole 22b is provided, the capsular attachment planned portion 23 is placed in the lens body 2 so that the first through hole 22b is not completely blocked when the anterior capsule is adhered to the intraocular lens 1. It should be provided in. Further, the first through hole 22b having the opening 22a on the front surface of the lens body 2 may have an opening on the rear surface of the lens body 2 as in the above embodiment. Furthermore, in addition to the rear surface of the lens body 2, a first through hole 22b having an opening on the side surface of the lens body 2 may be provided. By doing so, the aqueous humor outside the lens capsule 108 can be guided not only to the lens lower region in the lens capsule 108 but also to other regions (particularly the region near the side surface of the lens body 2). This also indicates that aqueous humor in both regions within the capsular bag 108 can be directed out of the capsular bag 108. A first through hole 22b having an opening 22a and an opening formed on the side surface of the lens body 2 and communicating only between the outside of the lens capsule 108 and the region near the side surface of the lens body 2 is provided. Of course.

  In contrast, only the groove 22c may be provided as the first circulation mechanism. In this case, however, it is necessary that at least a part of the groove 22c is exposed outside the lens capsule 108. If this condition is satisfied, as described above, the aqueous humor can pass under the anterior capsule by the groove 22c, and the inside and outside of the lens capsule 108 can be communicated with each other. The groove 22c provided on the front surface of the lens body 2 may be communicated with a hole having an opening on the rear surface of the lens body 2. By doing so, the aqueous humor flowing through the groove 22c under the anterior capsule is also guided to the lower lens region. This also indicates that aqueous humor in the lower lens region and other regions in the lens capsule 108 can be guided out of the lens capsule 108.

  An example of the intracapsular / external communication portion 22 other than the first through hole 22b and the groove 22c is that the intracapsular / external communication portion 22 is porous and can be permeated. By doing so, the aqueous humor permeates in the intracapsular / external communication portion 22. Thereby, it can be expected that the aqueous humor is exchanged inside and outside the lens capsule 108. Moreover, you may employ | adopt the structure which can make the clearance gap which can circulate aqueous humor between the anterior capsule and the lens main body 2 as the internal / external communication part 22.

(Second circulation mechanism)
In the above embodiment, the case where both the second through hole 31a and the notch 31b are provided in the protruding portion 3 as the intracapsular communication portion 31 in the second circulation mechanism has been described. On the other hand, the idea of the present invention can be applied even when one of the second through hole 31a and the notch 31b is provided as the second circulation mechanism.

  In addition, as an example of the intracapsular communication part 31 other than the second through hole 31a and the notch 31b, the structure of the protruding part 3 itself may be a support for supporting the lens body 2. By doing so, the partition of the protrusion 3 that separates the lower lens region from the other region is extremely small, and the aqueous humor can be circulated very smoothly. In addition, the contact area of the contact portion between the posterior capsule and the protruding portion 3 where the lens epithelial cells are considered to proliferate can be reduced to the minimum, and the development of secondary cataract can be effectively suppressed. In addition, like the 1st circulation mechanism, making the intracapsular communication part 31 permeate | transmittable as a porous thing is also mentioned.

(Place where the protrusion is provided)
In the above embodiment, the protrusion 3 is provided along the outer periphery of the lens body 2. On the other hand, the protruding portion 3 may be provided on the support portion 4. In that case, it is preferable to provide the protrusion 3 at the base 41. By doing so, the lens body 2 and the posterior capsule can be separated from each other, although not as much as along the outer periphery of the lens body 2.

Moreover, you may employ | adopt the structure which inserted the protrusion part 3 as a separate body between the capsule attachment plan part 23 of the lens main body 2, and the base part 41 of the support part 4. FIG. In addition, the intracapsular / external communication portion 22 may not interfere with the optical function of the optical portion 21. If this is the case, the first through hole 22b or the groove 22c that becomes the intracapsular / external communication portion 22 may have a shape having an optical function.
In the present specification, “the protruding portion 3 is provided along the outer periphery of the lens body 2” includes the protruding portion 3 that protrudes from the rear surface of the lens body 2 as in the above embodiment. The protrusion part 3 formed in the side surface of the lens main body 2 is also included.

(Configuration of intraocular lens)
In the above embodiment, the integrated intraocular lens in which the lens body 2 and the support portion 4 are integrated from the stage of the intermediate member has been described. On the other hand, the application range of the present invention extends to a multi-piece type intraocular lens 1 which is not an integral type.

(Other parts of the lens body)
In the above embodiment, the lens body 2 having the optical part 21, the intracapsular / external communication part 22, and the sac deposition scheduled part 23 has been described, but it may have a part having other functions. . For example, a transition region for smoothly transitioning between the optical unit 21 and the intracapsular communication unit 22 may be provided. Moreover, you may provide an edge part separately in the outer peripheral part seeing from the sac deposit | attachment scheduled part 23. FIG.

(Lens body (optical part) shape)
There is no restriction | limiting in particular as a shape of the optical part 21. FIG. That is, as long as the intraocular lens 1 is effective, it may be a convex lens, a concave lens, or a prism.

(Lens body and support material)
Moreover, although the soft material was mentioned as a constituent material of the lens main body 2, the support part 4, and the protrusion part 3, in fact, there is no restriction | limiting in particular. However, the lens body 2 is preferably made of a soft material that allows the lens body 2 to be folded. The term “foldable” described here is used to mean that the intraocular lens 1 including the lens body 2 can be folded into at least two. Therefore, the soft material constituting the lens body 2 may be a material having a high flexibility enough to fold the lens body 2. If a specific example is given except soft acrylic, soft materials, such as a silicone resin, hydrogel, and a urethane-type resin, can be used. Examples of the hard material include one or more selected from polypropylene (PP), polymethyl methacrylate (PMMA), a fluororesin (polyvinylidene fluoride), a polyimide resin, and the like.

(Can be folded)
On the other hand, of course, the present invention may be applied to the intraocular lens 1 that does not require folding. In that case, the hard material mentioned above may be used for the intraocular lens 1. However, in that case, a hole formed in the surface of the eyeball 101 or the lens capsule 108 is enlarged during the operation. Therefore, it is preferable to apply the present invention to the foldable intraocular lens 1.

(Support part)
Moreover, in said embodiment, although the support part 4 was comprised with the base part 41, the support part main body 42, and the front-end | tip part 43, this invention is not limited to the structure. That is, you may employ | adopt the support part 4 which consists only of the support part main body 42 without distinction like the base part 41 and the front-end | tip part 43. FIG. Further, the number of support portions 4 may be other than two. For example, three or more support portions may be provided, or one support portion formed so as to extend from the lens body 2 in the outer peripheral direction may be provided. After all, as long as the lens body 2 can be supported in the lens capsule 108, the known support portion 4 may be used.

(Dimension of intraocular lens)
The diameter of the lens body 2 in the present embodiment may be set to any size as long as the size is suitable for inserting the intraocular lens 1 into the intracapsular lens capsule 108. Similarly, the dimensions of the various parts of the lens body 2 (the optical part 21, the internal / external communication part 22, the capsular attachment part 23, etc.) are set to any dimensions as long as the conditions described in the above embodiment are satisfied. It doesn't matter.

  To describe a specific example of dimension setting, the diameter of the intraocular lens 1 is about 10 mm to 13 mm, and the diameter of the lens body 2 is preferably set to about 5 mm to 7 mm, more preferably 6 mm. good. Moreover, what is necessary is just to set the diameter of the optical part 21 to around 4 mm-5 mm. Moreover, what is necessary is just to set the width | variety (length of a radial direction) of the capsule attachment plan part 23 around 1 mm.

  As for the first circulation mechanism, the diameter of the first through hole 22b may be about 0.3 mm to 0.55 mm. If it is 0.3 mm or more, the aqueous humor can be sufficiently circulated inside and outside the lens capsule 108. If it is 0.55 mm or less, a sufficient space for the optical unit 21 can be secured, and the space occupied by the through-hole 22b on the front surface of the lens body 2 can be within an appropriate range. It becomes possible to maintain the mechanical strength of 1 appropriately. The width of the groove 22c may be about the same 0.3 mm to 0.55 mm. If it is 0.3 mm or more, the aqueous humor can be sufficiently circulated inside and outside the lens capsule 108. If it is 0.55 mm or less, the space occupied by the groove 22c on the front surface of the lens body 2 can be in an appropriate range, and the mechanical strength of the intraocular lens 1 can be appropriately maintained. Further, the depth of the groove 22c may be about 0.2 mm. Similarly, the mechanical strength of the intraocular lens 1 can be appropriately maintained.

  Further, regarding the second circulation mechanism, the diameter of the second through hole 31a may be about 0.3 mm to 0.55 mm. If it is 0.3 mm or more, the aqueous humor can be sufficiently circulated inside and outside the lens capsule 108. If it is 0.55 mm or less, the space occupied by the through-hole 31a in the protruding portion 3 can be in an appropriate range, and the mechanical strength of the intraocular lens 1 can be appropriately maintained. Further, the width of the notch 31b may be about 1 mm, and the depth of the notch 31b may be about 0.5 mm to 2.5 mm. Similarly, the mechanical strength of the intraocular lens 1 can be appropriately maintained.

  In addition, although it is a specific dimension of the protrusion part 3, in the state before inserting in the lens capsule 108, 0.5 mm-3 mm from the boundary of the lens main body 2 and the protrusion part 3, and the thickness direction of the lens main body 2 It preferably projects. If it is 0.5 mm or more, the aqueous humor can be sufficiently circulated between the lower lens region and the other region. If it is 3 mm or less, the lens body 2 will not be disposed on the anterior capsule side. If it becomes so, the possibility that the circulation of the aqueous humor may be hindered when the intraocular lens 1 or the lens capsule 108 covering the same contacts the iris 106 can be suppressed.

DESCRIPTION OF SYMBOLS 1 Intraocular lens 2 Lens main body 21 Optical part 22 Intracapsular inside-and-outside communication part 22a Opening 22b (1st) Through-hole 22c Groove 23 Encapsulated part 3 Protrusion part 31 Intracapsular communication part 31a (Second) Through-hole 31b Cutting Notch 32 End 4 Supporting part 41 Base part 42 Supporting part main body 43 Tip part 101 Eyeball 102 Cornea 103 Sclera 105 Anterior chamber 106 Iris 107 Pupil 108 Lens capsule 109 Ciliary zonule
110 Ciliary body 110a Ciliary projection 111 Lens 112 Retina 113 Vitreous body

Claims (7)

An intraocular lens to be inserted into the lens capsule, provided with a lens body having a lens function, a support part for supporting the lens body in the lens capsule, and in contact with the posterior capsule to separate the lens body from the posterior capsule An intraocular lens comprising a protruding portion,
A first circulation mechanism is provided between the outside of the capsular bag and the inside of the capsular bag, through which the aqueous humor can circulate through the intracapsular / external communication portion provided in the lens body; and
A second circulation in which the aqueous humor can circulate in the lens capsule through the intracapsular communication portion provided in the protrusion between the lens body and the posterior capsule and the other region. An intraocular lens characterized in that a mechanism is provided.   When the intraocular lens is inserted into the lens capsule, the lens capsule separates between the lens capsule and the lens capsule by attaching the anterior capsule formed with a hole and the lens body, and 2. The intraocular lens according to claim 1, wherein a region between the lens main body and the posterior capsule in the lens capsule and a region other than the lens body are divided by the protruding portion. The first circulation mechanism has a first through hole provided in the lens body, and at least between a region between the lens body and the posterior capsule in the lens capsule and outside the lens capsule. The aqueous humor is free to circulate,
The intraocular lens according to claim 1 or 2, wherein the second circulation mechanism has one of a notch and a second through hole provided in the protrusion. .   After the intraocular lens is inserted, the first through hole is disposed at a position where the first through hole is not blocked by the anterior capsule when the anterior capsule is attached to the main surface of the lens body. The intraocular lens according to claim 3.   The said protrusion part is provided along the outer periphery of the said lens main body, and protrudes to such an extent that a back capsule does not contact the said lens main body, The Claim 1 thru | or 4 characterized by the above-mentioned. Intraocular lens.   The protrusion protrudes in the thickness direction of the lens body from 0.5 mm to 3 mm from the boundary between the lens body and the protrusion before being inserted into the lens capsule. Item 6. An intraocular lens according to Item 5. An intraocular lens to be inserted into the capsular bag, a lens body having a lens function, a support portion for supporting the lens body in the capsular bag, and an outer periphery of the lens body to separate the lens body from the posterior capsule An intraocular lens comprising a provided protrusion,
When the intraocular lens is inserted into the lens capsule, the lens capsule separates between the lens capsule and the lens capsule by attaching the anterior capsule formed with a hole and the lens body, and The region between the lens body and the posterior capsule in the lens capsule and the other region are separated by the protrusion,
A first circulation mechanism is provided between the outside of the lens capsule and inside the lens capsule, through which the aqueous humor can circulate via the lens body; and
A second circulatory mechanism is provided in the capsular bag, between the region between the lens body and the posterior capsule and the other region, through which the aqueous humor can circulate through the protrusion,
The first circulation mechanism has a first through hole provided in the lens body, and after inserting an intraocular lens, the main surface of the lens body and the anterior capsule come into contact with each other. By disposing the first through hole closer to the center side from the outer periphery of the lens body to the extent that the first through hole is not blocked by the anterior capsule, at least the lens body and the posterior capsule in the lens capsule Aqueous humor can circulate freely between the area between and outside the lens capsule,
The second circulation mechanism has either one of a notch and a second through hole provided in the protrusion,
The protrusion protrudes in the thickness direction of the lens body from 0.5 mm to 3 mm from the boundary between the lens body and the protrusion before being inserted into the lens capsule. Inner lens.

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