JP5398089B2 - Intraocular lens - Google Patents

Description

  The present invention relates to an intraocular lens.

  As is well known, surgery for inserting an intraocular lens into the eye after the patient's clouded lens has been removed has been widely performed as a treatment for cataracts of the eye. For example, Patent Document 1 below proposes an intraocular lens that is inserted into the eye after the lens is removed and sutured to the ciliary body in the treatment of cataract.

Japanese Patent No. 2792588

  Focusing on the visual object is an important issue for patients who have had their lenses removed and fitted with an intraocular lens. Even in a conventional intraocular lens, the focus is naturally focused only on a visual object at a predetermined distance determined according to the focal length of the intraocular lens. However, in the conventional intraocular lens, there is no mechanism for adjusting the focus with respect to an object having a distance different from the predetermined distance.

  Therefore, the problem to be solved by the present invention is to provide an intraocular lens that is mounted in the eye after the lens has been removed and that can be adjusted by the user.

In order to solve the above-described problems, an intraocular lens according to the present invention has a lens function and is accommodated inside the posterior capsule in the eye with the lens removed at least leaving the posterior capsule. And a front lens unit that has a lens function and is disposed at a position in front of the eye relative to the rear lens unit, wherein the front lens unit is a lens of the rear lens unit. A first lens disposed at a position facing the lens surface, and extending from a side edge of the first lens to a part of a region extending from an iris in the eye to the ciliary body. And a support portion having flexibility, and the support portion is formed in a shape extending to the side of the first lens, and is farthest from the center of the first lens among the shapes. The portion contacts the inside of the ciliary groove of the eye and the first label In the state where the extension portion supporting the lens and the first lens are arranged in the posterior chamber of the eye, when the ciliary body is pressed, a force for pushing the first lens forward in the eye is transmitted. And a sub-extension part that branches off from the side surface of the extension part and extends toward the back of the eye and contacts the surface of the ciliary body .

  Thus, the intraocular lens according to the present invention includes a plurality of lenses each including a rear lens unit disposed in the posterior capsule obtained by extracting the crystalline lens and a front lens unit disposed in front of the eye relative to the rear lens unit. The support part of the front lens part has flexibility. Therefore, when the eye of the user moves, it is converted into the movement of the front lens part by bending. When the front lens unit moves and the distance between the front lens unit and the rear lens unit changes, the focal length of the lens system composed of the front lens unit and the rear lens unit changes. Therefore, an intraocular lens that can change the focal length by moving the inside of the eye by the user can be realized.

  One of the first lens and the second lens may be a convex lens and the other may be a concave lens.

  According to this invention, one of the first lens and the second lens is a convex lens and the other is a concave lens. Therefore, the distance between the both lenses can be changed by combining the convex lens for hyperopia and the concave lens for myopia. An intraocular lens that can adjust the focal length over a wide range from a far place to a far place is realized.

  In addition, with the tip of the support portion in contact with a part of the region from the iris to the ciliary body in the eye, the support portion bends according to the movement of the region from the iris to the ciliary body. The support portion may have a bent shape that allows the first lens to move in the front-rear direction in the eye.

  According to the present invention, the support portion having bending is provided with a shape that bends, and when the region from the iris to the ciliary body moves due to the bent shape, the support portion bends, and the first lens moves back and forth in the eye. Move in the direction. Thereby, the focal length can be adjusted by effectively moving the front lens portion back and forth by the bent shape of the support portion.

  The support portion is formed in a shape extending to the side of the first lens disposed in the posterior chamber, and sandwiches a portion of the posterior chamber side of the iris of the eye to support the first lens. A part may be provided.

  According to this invention, the support part of the front lens part includes a clamping part that clamps a part of the posterior chamber side of the iris of the eye. Thereby, the front lens part can be reliably supported in the eye by clamping a part of the posterior chamber side of the iris.

  Moreover, the shape of the said clamping part is good also as a shape where the site | part which clamps the iris in the recording part is located in the front of the eye rather than the said 1st lens.

  According to this invention, since the shape of the holding portion is such that the portion holding the iris is positioned in front of the eye relative to the lens portion, the first lens is fixed to the posterior chamber of the eye by the holding portion. In the state, the first lens can be positioned further rearward, thereby providing a sufficient spacing between the first lens and the iris. Therefore, the adhesion between the first lens and the iris can be effectively suppressed.

  Further, the support portion is formed by a shape extending to the side of the first lens, and a portion of the shape farthest from the center of the first lens is in contact with the inside of the ciliary groove of the eye, An extending portion that supports the first lens may be provided.

  According to the present invention, the structure that supports the front lens portion includes a structure that extends to the side of the first lens and supports it by contacting the inside of the ciliary groove. Accordingly, the front lens portion is effectively supported by the structure in contact with the inside of the ciliary groove.

  Further, the extending portion has a bent shape, and the bent shape is in a state where a portion of the extending portion farthest from the center of the first lens is in contact with the inside of the ciliary groove of the eye, The first lens may have a shape that allows the first lens to move in the front-rear direction in the eye according to the movement of the ciliary groove.

  According to the present invention, the extending portion has such a shape that when the ciliary body moves in a state where the extending portion is fixed to the ciliary groove, the front lens portion moves in the front-rear direction in the eye accordingly. Therefore, when the patient moves the ciliary body to focus the eye, the front lens unit moves back and forth accordingly, so that the intraocular lens can focus the eye according to the distance to the target. Has the potential to be realized.

  The extending portion has flexibility, and the portion of the extending portion farthest from the center of the first lens is in contact with the interior of the ciliary groove of the eye. It is good also as a magnitude | size which at least one part bends.

  According to the present invention, the extension portion is made flexible, and the size thereof is such that at least a part of the extension portion bends in a state where the extension portion is inserted into and contacted with the ciliary groove. Say it. As a result, the extended portion is in a state of pressing the inside of the ciliary groove with a certain amount of force, so that it is effectively avoided that the tip of the extended portion is detached from the ciliary groove, and the intraocular lens is reliably secured. Can be fixed in the back chamber.

  The extending portion may include a plurality of leg portions extending in a direction away from the center of the first lens by a leg shape from a plurality of circumferential positions on the side edge of the first lens.

  According to the present invention, since the extending portion is formed as a plurality of leg portions having a leg shape, an intraocular lens that is securely fixed to the posterior chamber can be realized with a simple structure and shape.

  Further, the tip of the leg may be inserted into the ciliary groove of the eye so as to contact at least a part of the inside of the ciliary groove.

  According to the present invention, the extending portion is formed as a plurality of leg portions having a leg shape, and the tip of the leg portion is brought into contact with the inside of the ciliary groove, so that a simple leg portion is provided. The intraocular lens can be reliably fixed to the posterior chamber by a simple method of contacting the inside of the ciliary groove with the structure and its tip.

  The leg portion has a bent portion that is bent at a position between an end portion on the side close to the first lens and an end portion on the side far from the first lens in the leg shape, and the first lens is In the state of being arranged in the posterior chamber of the eye, when the ciliary groove presses the leg, the end of the leg close to the first lens is pushed forward in the eye. The leg portion may have a shape that is positioned in front of the eye with respect to the bent portion, and an end portion of the leg portion on the side far from the first lens is positioned in front of the eye with respect to the bent portion.

  According to the present invention, the shape of the leg portion is specifically set to a shape that extends from the side close to the lens portion to the back in the eye, and then bends and extends to the front in the eye. When the patient moves the ciliary groove so as to focus the eye on the visual object due to the bent shape in this way, the lens unit moves back and forth accordingly, so that the focus of the eye depends on the distance to the object. An intraocular lens that can be matched is realized.

  Further, the extending portion may have a ring-shaped annular portion that is inserted into the ciliary groove in the circumferential direction.

  According to the present invention, since the extending portion has the ring-shaped annular portion that is inserted into the ciliary groove in the circumferential direction, when the extending portion is inserted into the ciliary groove, The extending portion and the inside of the ciliary groove can be brought into contact with each other in a wide range in the circumferential direction. Therefore, the front lens portion can be reliably fixed to the posterior chamber.

  Further, in the extended portion, a portion that contacts the inside of the ciliary groove may be formed with a concave portion or a convex portion that fits into the concave and convex portions inside the ciliary groove.

  According to the present invention, the concave portion or the convex portion is formed in the portion of the extending portion that contacts the inside of the ciliary groove so as to be fitted to the concave and convex portions inside the ciliary groove. Due to the concave / convex fitting, the extension in the ciliary groove can be more reliably fixed.

  The front lens portion may include a sub-extension portion that extends from a side of the first lens and contacts the surface of the ciliary body.

  According to the present invention, since the secondary extending portion that extends from the side of the first lens portion and contacts the surface of the ciliary body is provided, the intraocular lens can be securely used without stitching by using the ciliary body. Can be fixed in the eye.

  In addition, the sub-extension part transmits the force for pushing the first lens forward in the eye when pressed by the ciliary body in a state where the first lens is disposed in the posterior chamber of the eye. A shape extending from the side of the first lens toward the back of the eye may be provided.

  According to the present invention, the sub-extending portion that contacts the surface of the ciliary body extends from the side of the first lens toward the back of the eye, and is thereby pressed by the ciliary body. A force for pushing the first lens forward in the eye is transmitted. Therefore, when the patient operates to move the ciliary body to focus the eye, the lens unit moves back and forth accordingly, so an intraocular lens that can focus the eye according to the distance to the target is provided. realizable.

1 is a perspective view of an intraocular lens in Embodiment 1 of the present invention. 2 is a side view of an intraocular lens in Embodiment 1. FIG. 1 is a front view of an intraocular lens in Embodiment 1. FIG. The figure which shows the state which inserted and fixed the intraocular lens in the eye. The side view which shows the example of the mode of a motion of an intraocular lens. FIG. 6 is a front view of a front lens unit according to the second embodiment. Sectional drawing of the front lens part of Example 2. FIG. FIG. 6 is a front view of a front lens unit according to a third embodiment. FIG. 6 is a front view of a front lens unit of Example 4. FIG. 10 is a front view of a front lens unit of Example 5. FIG. 10 is a front view of a front lens unit of Example 6. The figure which shows the 1st example of the front-end | tip of a leg part. The figure which shows the 2nd example of the front-end | tip of a leg part. The figure which shows the 3rd example of the front-end | tip of a leg part. The figure which shows the 4th example of the front-end | tip of a leg part. The figure which shows the example of the mode of the ciliary body and ciliary groove after lens extraction. The figure which shows the example of the recessed part of the front-end | tip of a leg part. The figure which shows the function of the recessed part of the front-end | tip of a leg part. FIG. 10 is a perspective view of a front lens unit according to a seventh embodiment. FIG. 10 is a side view of a front lens unit according to a seventh embodiment. The figure which shows the state which inserted and fixed the intraocular lens of Example 7 in the eye. FIG. 20 is a side view showing an example of the movement of the intraocular lens of Example 7. FIG. 10 is a cross-sectional view of a front lens unit according to an eighth embodiment. The figure which shows the example of the recessed part of the front-end | tip of a subleg part. The figure which shows the function of the recessed part of the front-end | tip of a subleg part.

  Embodiments of the present invention will be described below with reference to the drawings. First, FIGS. 1 to 3 are a perspective view, a side view, and a front view of an intraocular lens of the present invention. Eye) direction (side, front, etc.).

  As shown in the figure, the intraocular lens is composed of two lenses, that is, a front lens portion 1 disposed relatively forward in the eye and a rear lens portion 1 ′ disposed relatively rearward in the eye. . The front lens portion 1 and the rear lens portion 1 'are separate bodies. Both the front lens portion 1 and the rear lens portion 1 ′ are disposed in the posterior chamber of the eye (after the iris) after removing the lens due to cataract, for example. However, the lens should be removed in the form of leaving the posterior capsule (extracapsular extraction).

  The front lens unit 1 is disposed in front of the posterior capsule. As will be described later, the front lens unit 1 has a structure for sandwiching the iris, a structure that is inserted into the ciliary groove and abuts on the inside (and a structure that abuts on the surface of the ciliary body), They are fixed to the posterior chamber (without suturing). The posterior lens portion 1 ′ is housed inside the posterior capsule and is stably held in the posterior capsule by contacting the inner surface of the posterior capsule.

  The front lens unit 1 includes a lens 2 (first lens), a clamping unit 3, and a leg unit 4 (extension unit). For example, the lens 2 is placed in the posterior chamber of the eye (region behind the iris) after the lens that has become cloudy due to cataracts is removed from the patient's eye, and performs the lens function of the lens.

  The clamping unit 3 supports and fixes the lens 2 in the posterior chamber by sandwiching the iris. The clamping unit 3 includes a pair of arms 30 and 30. As shown in FIG. 2, the arms 30, 30 are formed to extend from the side edges on the left and right sides of the lens 2, bent from the middle, and when the iris 30 is not sandwiched, The tips 31 and 31 are formed so as to contact each other.

  The sandwiching portion 3 is formed of a material having elasticity (flexibility, flexibility), and a doctor (operator) elastically deforms the sandwiching portion 3 so that a part of the portion facing the posterior chamber of the iris is formed on the arm 30. It is picked between the tips 31 and 31 of 30. Thereby, the iris is continuously held by the elastic restoring force of the arms 30 and 30. The lens 2 is supported in the posterior chamber by performing this clamping operation in the same manner with the clamping portions 3 formed on the left and right sides of the intraocular lens 3 in the figure.

  As shown in FIG. 2, the pair of arms 30, 30 of the clamping unit 3 extends obliquely from the side edge of the lens 2 toward the front of the eye (that is, the distal end 31 of the arms 30, 30 is more forward than the root side). (As described above, the description of the front, the rear, and the like also refers to the front and the rear of the face of the patient wearing the front lens unit 1 in the eye). Thereby, the space | interval between the lens 2 and an iris can be provided so that it may mention later. This produces an important effect of preventing (suppressing) adhesion between the lens 2 and the iris.

  In the embodiment shown in FIGS. 1 to 3, the leg 4 has a structure composed of four legs. The four legs have bent portions 40 and 41, a base portion 42 on the lens 2 side with respect to the bent portion 40, an intermediate portion 43 between the bent portions 40 and 41, and a distal end side with respect to the bent portion 41. A distal end portion 44. As shown in FIG. 2, the root portion 42 has a shape that extends rearward from the lens 2 (the bent portion 40 is behind the eye 2 rather than the lens 2). The intermediate portion 43 has a shape extending from the bent portion 40 to the front of the eye (the bent portion 41 is in front of the eye rather than the bent portion 40). The tip 44 has a shape extending in a (substantially) parallel direction with the lens.

  1 to 3 is merely an example, and the leg 4 can have various shapes in the present invention as will be described later. What is necessary is just to shape | mold the clamping part 3 and the leg part 4 integrally with the lens 2 with a resin material etc., for example. Alternatively, they may be formed separately from the lens 2 and later joined (adhered or the like).

  A rear lens portion 1 ′ is shown in the lower part of FIGS. 1 to 3. As described above, the posterior lens portion 1 ′ is housed inside the posterior capsule from which the crystalline lens has been removed. As shown in the drawing, the lens 2 of the front lens unit 1 and the lens 2 ′ of the rear lens unit 1 ′ may be arranged so as to be separated from each other and so that the lens surfaces (curved surfaces of the lenses) face each other. . At this time, it is preferable that the optical axes of the lens 2 and the lens 2 ′ are arranged so as to overlap the visual axis of the eye.

  The rear lens portion 1 ′ includes a lens 2 ′ (second lens) having a lens function and a loop portion 3 ′. In the example of FIGS. 1 to 3, a pair of loop portions 3 ′ is formed on the side edge of the lens 2 ′ opposite to the optical axis. The loop portion 3 ′ has a loop shape and is flexible (elastic). In a state where the posterior lens portion 1 ′ is housed inside the posterior capsule, the pair of loop portions 3 ′ is bent, and the posterior capsule is pushed from the inside by its elastic restoring force. Is fixed. The loop portion 3 ′ may be molded integrally with the lens 2 ′, or may be formed separately and then bonded (for example, bonded).

  The lens 2 of the front lens unit 1 and the lens 2 'of the rear lens unit 1' may be either a plus lens (convex lens) or a minus lens (concave lens), respectively. That is, the lens 2 may be a plus lens, the lens 2 'may be a minus lens, the lens 2 may be a minus lens, and the lens 2' may be a plus lens. Furthermore, both the lens 2 and the lens 2 'may be a plus lens, or both may be a minus lens. The plus lens (convex lens) may be any of a biconvex lens, a plano-convex lens, and a meniscus lens, and the minus lens (concave lens) may be any of a biconcave lens, a plano-concave lens, and a meniscus lens.

  As is well known, the focal length of a lens system composed of both lenses is determined according to the focal lengths of the front lens portion 1 and the rear lens portion 1 'and the distance between both lenses. As will be described later, in the intraocular lens of the present invention, since the position of the lens 2 of the front lens unit 1 can be moved back and forth, the distance between the two lenses changes, and the focal length of the lens system comprising both lenses accordingly. Changes. This opens up the possibility for the user wearing the intraocular lens of the present invention to adjust the focal length of the intraocular lens depending on the position up to the visual target. In particular, when one of the lens 2 and the lens 2 'is a minus lens for myopia and the other is a plus lens for hyperopia, the possibility that the range in which the focus can be adjusted is widened is improved.

  FIG. 4 shows a cross-sectional view of the eye with the front lens portion 1 and the rear lens portion 1 ′ shown in FIGS. 1 to 3 attached (fixed). As is known, in the eye, the front of the iris 101 is called the anterior chamber and the rear is called the posterior chamber. The front lens unit 1 is disposed in the posterior chamber. There is a ciliary body 102 on the rear side of the iris 101, and a crystalline lens is usually supported on the center of the ciliary body 102 in the eye. A groove-like region extending in the circumferential direction between the iris 101 and the ciliary body 102 is called a ciliary groove 103.

  First, the lens that becomes cloudy due to cataract is removed leaving the posterior capsule 104 (extracapsular extraction). Then, a part of the cornea 100 is incised, and the posterior lens portion 1 ′ is bent from the loop portion 3 ′ and accommodated in the sac. For example, using the elasticity (flexibility) of the posterior lens portion 1 ′, the posterior lens portion 1 ′ is rolled and inserted into the cartridge, and the tip of the cartridge is made to reach the inside of the posterior capsule 104 through the cornea 100. What is necessary is just to discharge | emit back lens part 1 '. Next, the front lens unit 1 is inserted into the posterior chamber. Also in this case, for example, using the elasticity (flexibility) of the front lens unit 1, the front lens unit 1 is rolled and inserted into the cartridge, the tip of the cartridge is made to reach the posterior chamber through the cornea 100, and there. The front lens unit 1 may be discharged.

  When the front lens portion 1 is fixed to the posterior chamber, the iris is held by the holding portion 3 and the leg portion 4 is inserted into the ciliary groove 103 and fixed. Among these, in the clamping part 3, it clamps so that a part of back surface of an iris may be pinched with the arm of the right and left clamping parts 3 and 3. FIG. In the leg portion 4, the tip of the leg portion 4 is fixed in contact with the innermost part of the ciliary groove 103. Note that the tip of the leg portion 4 does not necessarily need to be in the innermost part of the ciliary groove 103, but may be in contact with at least a part of the ciliary groove 103.

  As a main point of the present invention, any part of the front lens portion 1 including the sandwiching portion 3 and the leg portion 4 is not sutured in the eye. Further, the length of the leg 4 may be designed so that the leg 4 is slightly bent in a state where the tip of the leg 4 is inserted into the ciliary groove 103. As described above, the front lens unit 1 is reliably fixed to the posterior chamber by a composite fixing method using two types of methods using the sandwiching part and the leg part. The posterior lens portion 1 'is also stably held in the posterior capsule by the loop portion 3'.

  The front lens unit 1 of the present invention has a function of moving the position of the lens 2 back and forth by an action (reflection action) for focusing the eye of the patient. The function will be described with reference to FIG.

  According to medical knowledge, when a human attempts to focus the eye, force acts in the direction indicated by arrow 200 in FIG. This force distorts the leg portion 4 of the front lens portion 1 as shown in FIG. That is, the bent portion 41 is pressed in the direction of the lens 2, and the base portion 42 and the intermediate portion 43 of the leg portion 4 change to a posture closer to the lens 2.

  Thereby, the attitude | position of the root part 42 changes to the direction of the arrow 201, and the lens 2 is pushed in the intraocular front. When the force of the arrow 200 is lost, the lens 2 returns to the original position. When the lens 2 moves back and forth in this way, the distance between the lens 2 and the lens 2 'changes. As is well known, when the distance between two lenses changes, the focal length of a lens system composed of two lenses also changes accordingly. Accordingly, if a patient wearing the front lens unit 1 and the rear lens unit 1 ′ of the present invention moves the ciliary groove to focus the eye on the visual target, the focal length of the intraocular lens is visually It becomes possible to adjust according to the object.

  6 to 11 show another embodiment of the intraocular lens of the present invention. In the following embodiments, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and redundant description is omitted.

  The front lens portion 1a of the second embodiment shown in FIGS. 6 and 7 is an example in which the tip of the leg portion 4 is connected in the circumferential direction to form the annular portion 5. In this example, the leg portion has a bent portion 40 as in FIG. 1 and the like, and the leg portion 4 is first extended from the side edge of the lens 2 or the sandwiching portion 30 toward the back in the eye, and the bent portion. It bends at 40 and goes to the annular portion 5 in the front of the eye.

  As shown in FIG. 7, the annular portion 5 is formed as a flat shape whose cross-sectional shape is short in the visual axis direction of the eye (for example, the vertical direction shown in FIG. 2). 6 and 7, the front lens portion 1a of the second embodiment sandwiches a part of the rear side of the iris with the sandwiching portion 3, and inserts the annular portion 5 into the ciliary groove 103 over the entire circumference. What is necessary is just to arrange | position in an eye so that the radial direction outer end part of 5 may contact | abut the crevice groove | channel 103, for example in the innermost part. Since the annular portion 5 contacts the ciliary groove over the entire circumference, stable fixation is realized. In that case, it is suitable for insertion to a ciliary groove that the annular part 5 is flat shape.

  FIG. 8 shows the front lens portion 1b of the third embodiment. The example of FIG. 8 is an example in which there are six legs 4. Also in this example, the tips of the six leg portions 4 are inserted and fixed in the innermost portion of the ciliary groove. In the present invention, the number of leg portions 4 is not limited to four as shown in FIG. 1, and the number of leg portions 4 is not limited to six as shown in FIG. )

  FIG. 9 shows the front lens portion 1c of the fourth embodiment. This front lens portion 1c is an example in which the annular portion 5 in FIG. 5 is not formed over the entire circumference. In this example, the arc portion 5c is formed so as to connect only between the tips of the leg portions 4 adjacent to the left and right sides of the sandwiching portion 3. The present invention is not limited to this example, and a shape that forms only a part of the annular portion in FIG. 6 is also possible.

  FIG. 10 shows the front lens portion 1d of the fifth embodiment. The front lens portion 1d has a structure that serves as both a leg portion and a sandwiching portion. Specifically, a plate-like portion 4d having a width similar to that of the lens 2 and a thin plate shape (flat shape) in the thickness direction (visual axis direction) is provided on each of the left and right sides of the lens 2 in the drawing. . There is a cut portion 31 near the middle of the plate-like portion 4d, which serves as a clamping portion by clamping the back side of the iris. Furthermore, the tip side of the plate-like portion 4d corresponds to a leg portion, and the tip is brought into contact with, for example, the innermost portion of the ciliary groove. That is, the front lens portion of the present invention includes a plate-like plate-like portion that serves as both the extending portion and the clamping portion, and the clamping portion is provided at an intermediate portion (not necessarily the center) of the plate-like portion. It may be a cut portion that is formed and sandwiches the iris, and the tip of the plate-like portion may abut against the inside of the ciliary groove.

  The plate-like portion 4d may be formed by bending a flat plate at three locations. That is, in FIG. 10, the broken line intersecting with the cut portion 31 is a fold line protruding forward in the eye, the broken line 40d is a fold line protruding backward in the eye, and the broken line 41d is a fold line protruding forward in the eye. It is. And what is necessary is just to let the front end side rather than the broken line 41d extend in a horizontal direction (perpendicular to a visual axis).

  With the above shape, the cut portion 31 protrudes forward in the eye, so that the iris can be easily held, and the tip side of the broken line can be easily inserted into the ciliary groove. In addition, due to the action of the three folding lines described above, the lens 2 moves forward when the force indicated by the arrow 200 is applied as in FIG. 5 described above, and the lens 2 returns backward when the force is no longer applied. In the case of the shape of FIG. 10, the leg portion and the like are formed thick, so that the strength is improved.

  The front lens portion 1d shown in FIG. 10 may be modified as shown in FIG. In Example 6 of FIG. 11, in the plate-shaped part 4d, it has the shape where the periphery of the notch part 31 was deeply pierced. In the case of this shape, it is suitable for reliable clamping by the cut portion 31 by avoiding unnecessary contact with the iris or by facilitating bending at the cut portion 31.

  In the intraocular lens of the present invention, the tip shape of the leg can have various forms. 12 to 15 show four examples of the shape of the tip of the leg.

  In the example of FIG. 12, the tip 45a of the leg 4 has a curved shape. In this example, the curved surface comes into surface contact with the innermost part (inside) of the ciliary groove, and the leg portion 4 is securely fixed to the ciliary groove. In the example of FIG. 13, the tip 45 b of the leg 4 has a sharp shape having a corner. In this example, a corner | angular part collides with the innermost part (inside) of a ciliary groove, and the leg part 4 is fixed to a ciliary groove reliably.

  In the example of FIG. 14, the tip 45c of the leg portion 4 has a spherical shape. In this example, the outermost part (inside) of the ciliary groove is in surface contact with the spherical shape, and the leg 4 is securely fixed to the ciliary groove. In the example of FIG. 15, the tip 45d of the leg portion 4 has a planar shape. In this example, the leg portion 4 is securely fixed to the ciliary groove by making planar contact with the innermost part (inside) of the ciliary groove.

  12 to 15 may have a plate shape (flat shape), and FIGS. 12 to 15 may show only a plane orthogonal to the visual axis. In that case, for example, the tip 45b of FIG. 13 is in line contact with the innermost part of the ciliary groove.

  In the intraocular lens of the present invention, the following modifications may be further added to the tip shape of the leg. This will be described with reference to FIGS.

  According to the knowledge newly obtained by the inventor, the ciliary body 102 tends to be enlarged (deformed) after the lens is removed. In this enlargement (deformation), for example, as shown in FIG. 16, a deformation that narrows the ciliary groove 103 occurs. Thereby, the uneven | corrugated shape which exists in the surface of a ciliary groove approaches the iris 101 side.

  In order to cope with this deformation (or use this deformation), it is preferable to form a recess 46 in the vicinity of the tip 45 of the leg portion 4 as shown in FIG. The position where the concave portion 46 is formed is on the side of the leg 4 that is opposite to the iris (on the side facing the ciliary body) during intraocular fixation, and can contact the enlarged (deformed) ciliary groove. A position close to the tip may be used.

  Thereby, as shown in FIG. 18, the convex part of the ciliary body 102 is inserted into the concave part 46 of the leg part 4, and the fixing of the leg part 4 to the ciliary groove is further ensured. The recess 46 may be the leg of FIG. 1, FIG. 12 to FIG. 15, the leg 4 of another shape, the annular part of FIG. 7, or the arc part of FIG. If formed, the function shown in FIG. 18 is realized. Moreover, in this invention, you may form not only the formation of a recessed part but the uneven | corrugated | grooved part (or recessed part, convex part) fitted with the uneven | corrugated shape in the ciliary groove 103. FIG.

  In the front lens portion described above, a structure (a leg portion, an annular portion, etc.) that contacts the inside of the ciliary groove is formed. However, the front lens portion of the present invention is not limited thereto, and further contacts the ciliary body. A structure may be formed. Examples thereof are shown in FIGS.

  FIG. 19 is a perspective view of the front lens portion 1e of Example 7, and FIG. 20 is a side view thereof. The front lens portion 1e includes a secondary leg portion 4 'that branches off from the side surface of the intermediate portion 43 of the leg portion 4 and extends obliquely toward the rear in the eye. The front view of the front lens unit 1e may be the same as that shown in FIG. 3, for example. In other words, the extending direction seen from the front of the auxiliary leg 4 ′ may be the same direction as the leg 4. Alternatively, the extending direction as viewed from the front of the auxiliary leg 4 ′ may be different from the extending direction of the leg 4. Further, the auxiliary leg portion 4 ′ is not limited to the structure shown in FIGS. 19 and 20, and may be branched from any portion of the leg portion 4 or may be extended from the side edge of the lens 2.

  An example of a state in which the front lens unit 1e is mounted in the eye is shown in FIG. As described above, the clamping part 3 clamps a part of the iris, and the tip part 44 of the leg part 4 abuts the inside of the ciliary groove 103. The tip of the auxiliary leg 4 ′ comes into contact with the ciliary body 102. As described above, since the ciliary body 102 tends to be enlarged after the lens is extracted, the tip of the auxiliary leg portion 4 ′ surely contacts the surface of the ciliary body 102. The front lens unit is combined with the holding of the iris 101 by the clamping unit 3 and the contact of the leg 4 with the inside of the ciliary groove 103 and the contact of the auxiliary leg 4 'with the ciliary body 102. 1e is fixed in the eye (back chamber).

  The front lens portion 1e further improves the function of focusing by the patient by forming the auxiliary leg portion 4 '. This is shown in FIG. According to the inventor's knowledge, when a patient wearing the front lens portion 1e in the eye tries to focus the eye on the target, in addition to the force in the direction indicated by the arrow 200 described above, ciliary A force 200 ′ also acts on the body 102. The force 200 'presses the secondary leg 4' in the direction of the arrow 200 "shown.

  This action is combined with the action of the force 200 pressing the leg portion 4 as described above, and the leg portion 4 is distorted, so that the posture of the root portion 42 of the leg portion 4 is greatly changed in the direction of the arrow 201. As a result, the lens 2 is largely pushed forward in the eye. When the force of the arrows 200 and 200 'disappears, the lens 2 returns to the original position.

  That is, in the front lens portion 1e, not only the movement of the ciliary groove 103 but also the movement of the ciliary body 102 is transmitted, and the lens 2 moves back and forth. Then, the moving range of the lens 2 can be made larger than when only the movement of the ciliary groove 103 is transmitted. Furthermore, according to the knowledge obtained by the inventors, the expansion and contraction movement of the ciliary body is relatively larger than the expansion and contraction movement of the ciliary groove. Therefore, the forward / backward movement width of the lens 2 in the front lens portion 1e is increased by forming the auxiliary leg portion 4 '.

  If the range of movement forward and backward of the lens 2 becomes larger, the distance between the lens 2 and the lens 2 'also becomes larger. Therefore, the change width of the focal length of the lens system composed of the lens 2 and the lens 2 ′ becomes larger. Therefore, the patient wearing the front lens unit 1e can see the subject in a relatively wide distance range from himself / herself.

  The structure that contacts the ciliary body 102 in the intraocular lens of the present invention is not limited to the above example, and any structure that contacts the ciliary body 102 can be used. For example, the auxiliary leg portion 4 'may be added to the front lens portion 1a shown in FIGS. Such an embodiment 8 is shown in FIG. FIG. 23 is a cross-sectional view of the front lens portion 1f of Example 8 taken along the line AA corresponding to FIG.

  The front view of the front lens portion 1f may be the same as that shown in FIG. In other words, the extending direction seen from the front of the auxiliary leg 4 ′ may be the same direction as the leg 4. Alternatively, the extending direction as viewed from the front of the auxiliary leg 4 ′ may be different from the extending direction of the leg 4. In the front lens portion 1f, as described above, the clamping portion 3 clamps a part of the iris, the annular portion 5 contacts the inside of the ciliary groove in the circumferential direction, and the tip of the auxiliary leg portion 4 ′ has a hair. It touches the body. Thus, the intraocular lens is securely fixed in the eye by the composite structure.

  The above-described concave portion (convex portion, concave-convex portion) at the tip of the leg 4 shown in FIGS. 17 and 18 may be formed on the tip of the auxiliary leg 4 ′. Examples thereof are shown in FIGS. 24 and 25. In the example of FIG. 24, a recess 46 'is formed in the vicinity of the tip 45' of the auxiliary leg 4 '. The concave portion 46 'may be the tip of the auxiliary leg portion 4' of the front lens portion 1e, 1f described above.

  Thus, when the intraocular lens is mounted in the eye, as shown in FIG. 25, the convex portion of the ciliary body 102 is inserted into the concave portion 46 ′ of the auxiliary leg portion 4 ′, and the auxiliary leg portion 4 ′ It is securely fixed to the surface of the body 102. The concave portion 46 ′ is not limited to the front lens portions 1 e and 1 f described above, and may be formed at the tip of the contact portion with the ciliary body formed in the intraocular lens. Further, the present invention is not limited to the formation of the single concave portion 46 ′, and a concave and convex shape (for example, a plurality of concave portions and convex portions) that fits with the concave and convex shape on the surface of the ciliary body 102 may be formed.

  The embodiments of the present invention described above can be appropriately changed without departing from the spirit described in the claims. For example, the shape and structure of the sandwiching portion are not limited to the above-described example of the arm shape, and at least a part of the posterior chamber side of the iris 101 can be sandwiched and an interval can be formed between the lens 2 and the iris 101. Any shape and structure may be used. Moreover, although the shape of the leg part 4 was made into the shape bent in two places in the said Example, this invention is not limited to it, The shape bent in more places (three places, four places, etc.) may be sufficient. Alternatively, the bending direction may be different from the above-described illustration. Further, the bent portion may be bent in a curvilinear (R shape) instead of a bend having a corner portion.

  Further, in the above description, the mode including both the clamping portion 3, the extending portion (the leg portion 4, the annular portion 5), and the auxiliary extending portion 4 ′ has been described. However, in the present invention, only one of them is provided. Only a combination of parts may be provided. For example, it is good also as a structure provided only with the extension part (the leg part 4, the annular part 5), without providing the clamping part 3. FIG. These shapes can be obtained simply by deleting the clamping part 3 in FIGS. Further, the present invention may have a structure with three or more lenses, including two of the above embodiments as a part.

DESCRIPTION OF SYMBOLS 1 Front lens part 1 'Back lens part 2 Lens (1st lens)
2 'lens (second lens)
3 Arm (clamping part)
4 legs (extension part)
4 'deputy leg (deputy extension)
5 Annular part (extension part)

Claims (12)

A posterior lens unit that has a lens function and is accommodated inside the posterior capsule in the eye in a state where the lens is removed leaving at least the posterior capsule;
A front lens part that has a lens function and is disposed at a position in the eye in front of the rear lens part,
The front lens part is
A first lens disposed at a position facing a lens surface of a second lens that is a lens of the rear lens portion;
A supporting portion that extends from a side edge of the first lens to a part of a region from the iris in the eye to the ciliary body to support the first lens, and has a flexibility;
The support portion includes:
The first lens is formed by a shape extending to the side of the first lens, and a portion of the shape farthest from the center of the first lens is in contact with the interior of the ciliary groove of the eye to support the first lens. Extending part to be
In a state where the first lens is disposed in the posterior chamber of the eye, when it is pressed by the ciliary body, it branches from the side surface of the extending portion so as to transmit a force for pushing the first lens forward in the eye. A sub-extension part that extends toward the back of the eye and contacts the surface of the ciliary body,
Intraocular lens comprising the.   The intraocular lens according to claim 1, wherein one of the first lens and the second lens is a convex lens and the other is a concave lens.   With the tip of the support part in contact with a part of the region from the iris to the ciliary body in the eye, the support part bends according to the movement of the region from the iris to the ciliary body, The intraocular lens according to claim 1, wherein the support portion has a bent shape that enables the first lens to move in the front-rear direction in the eye.   The support portion is formed in a shape extending to the side of the first lens disposed in the posterior chamber, and sandwiches a portion of the posterior chamber side of the iris of the eye to support the first lens. The intraocular lens according to claim 1, comprising:   5. The intraocular lens according to claim 4, wherein a shape of the clamping part is a shape in which a portion of the clamping part that clamps the iris is positioned in front of the eye with respect to the first lens. The extended portion has a bent shape, and the bent shape is a state in which the furthest portion of the extended portion from the center of the first lens is in contact with the inside of the ciliary groove of the eye. like in accordance with the movement of the groove, intraocular lens according to claim 1 which is shaped to allow the movement in the longitudinal direction of the first lens within the eye. The extending portion is flexible, and at least a portion of the extending portion is in a state in which a portion of the extending portion farthest from the center of the first lens is in contact with the interior of the ciliary groove of the eye. The intraocular lens according to claim 1, wherein a part of the intraocular lens has a size to be bent. The elongated portion, the circumferential direction of a plurality of locations on the side edge of the first lens, claims 1 comprises a plurality of legs extending away from the center of the first lens by leg shape 7 The intraocular lens according to any one of the above. The intraocular lens according to claim 8 , wherein a tip of the leg portion is inserted into the ciliary groove of the eye and abuts on at least a part of the inside of the ciliary groove. The leg portion has a bent portion that is bent at a position between an end portion on the side close to the first lens and an end portion on the side far from the first lens in the leg shape,
In a state where the first lens is disposed in the posterior chamber of the eye, when the ciliary groove presses the leg, the first lens is pushed forward in the eye and is close to the first lens of the leg. The leg has a shape in which the end on the side is located in front of the eye with respect to the bent portion, and the end on the side farther from the first lens of the leg is located in front of the eye than the bent portion. The intraocular lens according to claim 8 or 9 . The intraocular lens according to any one of claims 1 to 10 , wherein the extending portion has an annular annular portion that is inserted into the ciliary groove in the circumferential direction. In the extended portion, the abutting portion in the interior of the ciliary groove, claims 1 recesses or protrusions to the interior of the irregularities and the fitting of the ciliary groove is formed according to any one of 11 Intraocular lens.

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