JP2019118688A - Intraocular lens - Google Patents

Abstract

To provide an intraocular lens that allows tacking to be performed more accurately when inserted into an eye by an intraocular lens insertion instrument.SOLUTION: An intraocular lens 1 is inserted into an eye by an intraocular lens insertion instrument. The intraocular lens 1 comprises an optical part 2, a front support part 3, and a rear support part 7. The shape of the optical part 2 is a disk shape. The front support part 3 bends and extends forward from the optical part 2 in a state in which the intraocular lens 1 is installed in the intraocular lens insertion instrument, and a tip thereof is a free end. The rear support part 7 bends and extends rearward from the optical part 2 in the state in which the intraocular lens 1 is installed in the intraocular lens insertion instrument, and a tip thereof is a free end. The front support part 3 and the rear support part 7 are formed in a structure that is not point-symmetrical with respect to an optical axis of the optical part 2.SELECTED DRAWING: Figure 8

Description

  The present disclosure relates to an intraocular lens inserted into an eye by an intraocular lens insertion device.

  Heretofore, as one of cataract surgery methods, a method of inserting a foldable soft intraocular lens into the eye instead of the removed lens is used. In addition, in order to correct the refractive power of the eye, an intraocular lens may be inserted in front of the crystalline lens. For the insertion of the intraocular lens into the eye, an intraocular lens insertion instrument called an injector may be used.

  The intraocular lens insertion device may fold the intraocular lens in a state in which the anterior support portion and the posterior support portion of the intraocular lens are deformed and positioned on the optical portion (a state in which so-called "tacking" is performed). is there. By performing the tacking, for example, the possibility of the occurrence of breakage or the like of the support portion is reduced.

  In the intraocular lens insertion device described in Patent Document 1, the rear support portion is pushed by the plunger to perform tacking of the rear support portion. In addition, when the entire intraocular lens is pushed forward by the plunger, the front support portion contacts the inner wall of the insertion portion, and tacking of the front support portion is performed.

JP, 2016-190023, A

  As disclosed in Patent Document 1, the mechanism for tacking the front support and the mechanism for tacking the rear support are often different. In consideration of this situation, a technique for improving the accuracy of tacking by improving the intraocular lens insertion device has been proposed, but it is still required to further improve the accuracy of tacking.

  A typical object of the present disclosure is to provide an intraocular lens that can be tacked more accurately when inserted into the eye by an intraocular lens insertion device.

  An intraocular lens provided by an exemplary embodiment of the present disclosure is an intraocular lens to be inserted into the eye by an intraocular lens insertion device, wherein the disc-shaped optical portion and the intraocular lens are the intraocular While being installed in the lens insertion device, the lens supports and extends from the optical unit toward the front of the intraocular lens insertion device, while the distal end is a free end, and the intraocular lens is the eye And a rear support portion having a distal end as a free end while being curved and extended from the optical unit to the rear of the intraocular lens insertion device when installed in the inner lens insertion device, the front support The portion and the rear support portion are formed in a structure which is not point-symmetrical with respect to the optical axis of the optical portion.

  The intraocular lens in the present disclosure is more accurately tacked when inserted into the eye by an intraocular lens insertion device.

It is the perspective view which looked at the intraocular lens insertion instrument 100 from diagonally upper right. It is the perspective view which looked at the plunger 300 from diagonally upper right. It is a schematic explanatory drawing which shows the state to which the movement and deformation | transformation of the intraocular lens 200 were performed appropriately. It is a figure which shows an example of the state where tacking of the back support part 207 of the intraocular lens 200 is not performed normally. It is a figure which shows an example of the state where tacking of the back support part 207 of the intraocular lens 200 is not performed normally. It is a figure which shows an example of the state where tacking of the front support part 203 of the intraocular lens 200 is not performed normally. It is a top view of the intraocular lens 1A of a 1st aspect. It is a figure which shows the state in which tacking of the intraocular lens 1A of a 1st aspect is performed. It is a top view of intraocular lens 1B of the 2nd mode. It is a figure which shows the state in which tacking of the intraocular lens 1B of a 2nd aspect is performed. It is a top view of the intraocular lens 1C of a 3rd aspect. They are (a) top view of intraocular lens 1D of the 1st modification, and (b) right side view. It is a top view of intraocular lens 1E of the 2nd modification. FIG. 14 is a cross-sectional view taken along line AA in FIG.

<Overview>
The intraocular lens exemplified in the present disclosure includes an optic, an anterior support, and a posterior support, and is inserted into the eye by an intraocular lens insertion device. The optic is disk shaped. The anterior support portion is curved and extends from the optical portion toward the front of the intraocular lens insertion device when the intraocular lens is installed in the intraocular lens insertion device, and the distal end is a free end. The back support portion is curved and extends from the optical portion toward the back of the intraocular lens insertion device when the intraocular lens is installed in the intraocular lens insertion device, and the distal end is a free end. The front support and the rear support are formed in a structure that is not point-symmetrical with respect to the optical axis of the optical unit.

  In the intraocular lens exemplified in the present disclosure, the structure of the anterior support and the structure of the posterior support are not point-symmetrical with respect to the optical axis of the optical part. Therefore, when the mechanism for tacking the front support and the mechanism for tacking the rear support are different, each of the front support and the rear support is easily deformed according to the mechanism of tacking. . Thus, the accuracy of tacking is improved.

  The front support portion and the rear support portion may have different deformation characteristics from each other by being formed in a structure that is not point-symmetrical with respect to the optical axis of the optical portion. In this case, each of the front support and the rear support deforms more appropriately according to the mechanism of the respective tacking. The deformation characteristic may be at least one of the manner of application of a force causing deformation, the degree of deformation, and the ease of deformation.

  The intraocular lens insertion device may include a nozzle whose passage area decreases in the forward direction, and an insertion port provided at the tip of the nozzle. The intraocular lens may be inserted into the eye through the insertion port by pushing the passage inside the intraocular lens insertion device forward. The front support may be folded on the lens surface of the optical unit by contacting the inner wall of the nozzle in the process of pushing the intraocular lens forward. In this case, the operation of pushing the intraocular lens causes both the tacking of the anterior support and the insertion of the intraocular lens into the eye. Therefore, the intraocular lens is appropriately inserted into the eye with a simple operation.

  The intraocular lens insertion device may include a rod-like push-out member that pushes the intraocular lens forward. The rear support may be folded on the lens surface of the optical unit by being pushed forward by the pushing member. In this case, the operation of pushing the pushing member forward causes both the tacking of the rear support and the insertion of the intraocular lens into the eye. Therefore, the intraocular lens is appropriately inserted into the eye with a simple operation.

  However, it is also possible to modify the specific method for tacking the anterior support and the posterior support by means of an intraocular lens insertion device. For example, in the process of moving the intraocular lens forward, tacking of the front support portion may be performed by bringing the front support portion into contact with a projection or the like provided in the passage of the intraocular lens insertion device. In addition, the intraocular lens insertion device may be configured to perform in advance tacking of at least one of the front support and the rear support before the intraocular lens is pushed forward by the push-out member. Even in such a case, when the mechanism for tacking the front support and the mechanism for tacking the rear support are different, the structure of the front support and the structure of the rear support are not point symmetrical It is effective.

  The front support may be longer than the rear support. In this case, when the front support passes through the inside of the nozzle, at least one of the contact area of the front support and the inner wall of the nozzle and the contact time is easily secured, so that the front support is folded more accurately. In addition, since the rear support is shorter than the front support, the possibility of improper bending of the rear support is reduced when a part of the rear support is pushed out by the push-out member. Thus, the accuracy of tacking is improved.

  The average value of the thickness of the front support may be smaller than the average of the thickness of the rear support. In this case, since the average value of the thickness of the rear support is larger than that of the front support, there is a possibility that improper bending may occur in the rear support when a part of the rear support is pushed out by the pushing member. descend. Thus, the accuracy of tacking is improved.

  Also, if the anterior support is thinner and longer than the posterior support, the stress caused by the anterior support contacting the capsule when the intraocular lens is fixed in the capsule, and the posterior support It is easy for the stress generated by contact to be close to the value. Thus, the position at which the optical unit is held can easily approach the center of the capsule.

  The proximal end of the front support may project further away from the optical axis of the optical unit than the proximal end of the rear support. In this case, in the process of moving the intraocular lens forward in the intraocular lens insertion device, the protrusion formed at the proximal end of the front support, the filling in the inner wall of the nozzle and the passage (e.g. ) Stress is likely to be applied. As a result, the front support is properly bent by the stress applied to the protrusion. Also, since the proximal end of the posterior support is not provided with the same protrusion as the anterior support, there is a possibility that the proximal end of the posterior support may inhibit proper movement and deformation of the intraocular lens. Low. Therefore, the accuracy of tacking is appropriately improved.

  The base end may be a range of one half of the total length of the support from the position where the support and the optical unit are connected.

  Of the front support portion, at least an outer peripheral surface facing in a direction away from the optical axis of the optical portion may be provided with a frictional force increasing portion generating a frictional force larger than the frictional force applied to the outer peripheral surface of the rear support portion. . In this case, in the process of moving the intraocular lens forward in the intraocular lens insertion device, stress applied from the filling (for example, viscoelastic substance) in the inner wall of the nozzle and the passage to the anterior support by the frictional force increasing portion To increase. As a result, the front support is properly bent by stress. Further, the frictional force applied to the outer peripheral surface of the rear support portion is smaller than the frictional force applied to the outer peripheral surface of the front support portion. Therefore, the frictional force applied to the posterior support is unlikely to inhibit proper movement and deformation of the intraocular lens. Therefore, the accuracy of tacking is appropriately improved.

  In addition, the specific structure of a frictional force increase part can be selected suitably. For example, the frictional force increasing portion may be provided by forming unevenness on the outer peripheral surface of the front support portion. By applying plasma treatment to roughen the surface roughness of the outer peripheral surface, a frictional force increasing portion may be provided. By increasing the thickness of the front support portion (that is, the thickness in the direction parallel to the optical axis of the optical portion) to increase the contact area of the inner wall of the nozzle and the packing and the outer peripheral surface of the rear support portion May be provided. The front support portion may be provided with a frictional force increasing portion by forming a rib extending in a direction parallel to the optical axis.

  In addition, the frictional force increasing portion may be provided at one of the distal end and the proximal end of the front support, or may be provided at both the distal end and the proximal end. Also, the frictional force increasing portion may be provided on the entire outer peripheral surface of the front support portion. In this case, the tacking accuracy of the front support portion is further improved.

  In the intraocular lens according to the present disclosure, at least one of the shape, the angle, the weight ratio, the thickness, the surface roughness, and the like of the support portion such that the center of the optical portion approaches the center of the capsule as much as possible when fixed in the capsule. It has been adjusted. Thus, the intraocular lens in the present disclosure is suitably fixed within the capsule of the patient's eye, with the structure of the support not being point-symmetrical.

Embodiment
(Intraocular lens insertion device)
Hereinafter, typical embodiments of the present disclosure will be described with reference to the drawings. First, with reference to FIG. 1 and FIG. 2, an example of the intraocular lens insertion instrument used in order to insert the intraocular lens 1 of this embodiment in the eye of a patient's eye is demonstrated. In the following description, the direction of the nozzle 180 side of the main body portion 101 in the intraocular lens insertion device 100 (lower left side in FIG. 1) is the front of the intraocular lens insertion device 100 and the direction of the pressing portion 370 of the plunger 300 (The upper right side in the drawing of FIG. 1) is the rear of the intraocular lens insertion device 100. Further, the upper side of the drawing of FIG. 1 is the upper side of the intraocular lens insertion device 100, the lower side of the drawing of FIG. 1 is the lower side of the intraocular lens insertion device 100, and the lower right side of FIG. The upper left side in the drawing of FIG. 1 is the left of the intraocular lens insertion device 100.

  The overall configuration of the intraocular lens insertion device 100 of the present embodiment will be described with reference to FIG. The intraocular lens insertion device 100 is used to insert the deformable intraocular lens 1 (details will be described later) into the eye. The intraocular lens insertion device 100 includes a body portion 101 and a plunger 300. The main body portion 101 is substantially cylindrical, and the intraocular lens 1 is inserted into the eye through a passage inside the main body portion 101. The plunger 300 is rod-shaped, and can move in the passage in the inside of the main body portion 101 in the front-rear direction. The plunger 300 pushes the intraocular lens 1 filled in the inside of the main body portion 101 by moving forward along the pushing shaft (shaft of the passage) A.

  The main body portion 101 and the plunger 300 of the present embodiment are formed of a resin material. The intraocular lens insertion device 100 may be formed by molding, cutting by cutting out resin, or the like. Since the intraocular lens insertion device 100 is made of a resin material, the user can easily discard the used intraocular lens insertion device 100.

  In the present embodiment, the inner wall of the main body portion 101 is lubricated in order to smoothly insert the adhesive soft intraocular lens 1 into the eye. Further, the intraocular lens insertion device 100 of the present embodiment is formed to be colorless and transparent or colorless and translucent. Therefore, the user can easily visually recognize the deformed state of the intraocular lens 1 filled in the intraocular lens insertion device 100 from the outside of the intraocular lens insertion device 100.

  The main body unit 101 will be described with reference to FIG. The main body portion 101 includes a main body cylindrical portion 110, an installation portion 130, and a nozzle (insertion portion) 180.

  The main body cylindrical portion 110 is formed in a cylindrical shape extending in the front-rear direction, and is positioned on the rear end side (base end side) of the main body portion 101. A projecting portion 111 gripped by the user is formed on the outer periphery slightly forward of the rear end of the main body tubular portion 110.

  The installation portion 130 is connected to the front end side of the main body cylindrical portion 110. The placement unit 130 is filled with the intraocular lens 1. In detail, the installation unit 130 includes the holding unit 160 and the setting unit 170. The holding unit 160 holds the intraocular lens 1 when the intraocular lens insertion device 100 is in the storage state. The set portion 170 is provided rotatably around the axis of the tip. When the setting unit 170 is rotated, the intraocular lens 1 held by the holding unit 160 is moved to a standby position where it can be pushed out by the plunger 300 and positioned.

  The nozzle 180 is connected to the front end side of the installation unit 130. The passage area in the nozzle 180 becomes smaller toward the front in order to make the intraocular lens 1 smaller in the process of pushing the intraocular lens 1 forward. That is, the nozzle 180 is formed with a tapered internal space. At the front end of the nozzle 180, a cylindrical insertion portion 182 whose tip is obliquely cut is provided. The insertion portion 182 is inserted into the eye. At the front end of the insertion portion 182, an insertion port 183, which is an opening for discharging the intraocular lens 1 from the internal passage to the front, is formed. The passage inside the main body portion 101 penetrates from the rear end of the main body cylindrical portion 110 to the insertion port 183 at the front end of the nozzle 180.

  The schematic configuration of the plunger 300 will be described with reference to FIG. The plunger 300 of the present embodiment includes a pushing member 310, a shaft base 350, and a pressing portion 370.

  The pressing portion 370 is formed at the rear end of the plunger 300. The pressing portion 370 is a plate-like member extending in a direction orthogonal to the extrusion axis A (see FIG. 1). When the user pushes the plunger 300 forward, the finger of the user contacts the pressing portion 370.

  The shaft base 350 is a rod-like member extending forward from the front end side of the pressing portion 370. In the present embodiment, the shaft base 350 is formed so that the shape of the cross section orthogonal to the extrusion axis A is substantially H-shaped. Rotation of the circumferential direction of extrusion axis A of plunger 300 to main part 101 is suppressed by inserting axis base 350 in main part cylinder part 110 whose shape of the section orthogonal to extrusion axis A is substantially rectangular. . When the plunger 300 moves forward and reaches a position where insertion of the intraocular lens 1 into the eye is completed, the inclined portion 353 formed at the lower end of the front end of the shaft base 350 is formed at a predetermined position of the main body 101 Contact the sloped surface. As a result, the front end of the plunger 300 is prevented from excessively protruding from the insertion port 183 (see FIG. 1).

  The pushing member 310 is a rod-like member, and extends forward from the front end of the shaft base 350 along the axial direction of the pushing axis A. The extrusion member 310 is formed so that the shape of the cross section orthogonal to the extrusion axis A is substantially circular. Further, the thickness of the pushing member 310 is such that it can pass through the insertion port 183 of the main body portion 101. The pushing member 310 moves forward in the passage of the main body portion 101 along the pushing axis A, thereby tacking the intraocular lens 1 and discharging the intraocular lens 1 from the insertion port 183 into the eye.

(Normal tacking)
The normal movement and deformation of the intraocular lens 200 when the intraocular lens 200 is inserted into the eye by the intraocular lens insertion device 100 of the present embodiment will be described with reference to FIG. The intraocular lens 200 shown in FIG. 3 is a conventional intraocular lens in which the structure of the front support portion 203 and the structure of the rear support portion 207 are point-symmetrical with respect to the optical axis of the optical portion 202. It differs from the intraocular lens 1 of the present embodiment.

  First, the operator can push the intraocular lens 200 held by the holding unit 160 (see FIG. 1) of the installation unit 130 by the plunger 300 by rotating the setting unit 170 (see FIG. 1). Move to a standby position where Here, as shown in FIG. 3A, the proximal end portion of the rear support portion 207 in the intraocular lens 200 held by the holding portion 160 is shifted in either the left or right direction with respect to the extrusion axis A. There is. As an example, in the present embodiment, the proximal end 204B of the rear support portion 207 is located on the right side (lower side in FIG. 3) with respect to the extrusion axis A. The left and right direction in which the support portions 203 and 207 of the intraocular lens 200 extend may be the reverse direction to the present embodiment. In addition, the intraocular lens insertion device 100 of the present embodiment is a so-called preset type device in which the intraocular lens 1 is filled in advance. However, the technique exemplified in the present disclosure can also be applied to an intraocular lens insertion device or the like in which the intraocular lens 1 is filled immediately before inserting the intraocular lens 1 into a patient's eye.

  Next, the worker injects a filler (for example, a visco-elastic substance, water or the like) into the installation portion 130 using a syringe or the like to start forward movement of the plunger 300. As a result, as shown in FIG. 3A, the pushing member 310 of the plunger 300 comes in contact with a part of the rear support portion 207 of the intraocular lens 200.

  When the plunger 300 is further pushed forward, as shown in FIG. 3B, the rear support portion 207 is moved by the pushing member 310 in a direction approaching the optical portion 202 (that is, forward). Thereafter, the rear support portion 207 is deformed and moved on the lens surface (upper side) of the optical portion 202 to be folded, and the tip of the rear support portion 207 faces the front. As a result, tacking of the rear support portion 207 is performed.

  When the plunger 300 is further pushed forward, the pushing member 310 contacts the optical unit 202, and the entire intraocular lens 200 moves forward. As shown in FIG. 3C, when the intraocular lens 200 reaches the nozzle 180, the front support portion 203 contacts the inner wall of the nozzle 180 which is tapered. Specifically, the proximal end portion of the front support portion 203 contacts the inner wall on the left side of the nozzle 180 and receives stress, so that the front support portion 203 is deformed in the direction (that is, the rear) approaching the optical portion 202. Further, the vicinity of the tip end portion of the front support portion 203 is deformed rearward by being in contact with the right inner wall of the nozzle 180 and receiving stress. As a result, as shown in FIG. 3D, the front support portion 203 is deformed and moved onto the lens surface of the optical portion 202 and folded, and the tip end of the front support portion 203 faces rearward. That is, tacking of the front support portion 203 is performed.

  As the plunger 300 is further pushed forward, the optical part 2 of the intraocular lens 200 also contacts the inner wall of the tapered nozzle 180. As a result, as shown in FIGS. 3D and 3E, the intraocular lens 200 is slightly folded in a state in which the front support portion 203 and the rear support portion 207 are tacked. Thereafter, the intraocular lens 200 is inserted into the eye from the insertion port 183.

(Tacking abnormality)
Next, with reference to FIG. 4 and FIG. 5, an example of the state where tacking of the back support part 207 is not normally performed is demonstrated. In the example shown in FIG. 4, an inappropriate bending occurs in the rear support portion 207 while the rear support portion 207 is deformed and moved forward by the pushing member 310. As a result, the vicinity of the tip end portion of the rear support portion 207 which should be moved onto the lens surface of the optical portion 202 is caught on the side surface of the optical portion 202. When the pushing member 310 is further pushed in this state, at least a part of the rear support portion 207 enters the lower side (rear side) of the optical portion 202, and tacking is not normally performed. Further, in the example shown in FIG. 5, in the process in which the rear support portion 207 is deformed and moved forward by the pushing member 310, the tip end side of the rear support portion 207 is appropriately bent backward. Also in this case, the tacking of the rear support portion 207 is not normally performed. Such a tacking abnormality is particularly likely to occur when the rod-like pushing member 310 is brought into contact with one point of the rear support portion 207 and pushed out. In addition, such a tacking abnormality is more likely to occur as the rear support portion 207 is longer and as the rear support portion 207 is thinner. In addition, such a tacking abnormality is more likely to occur as the resistance of the rear support portion 207 to the filling filled in the installation portion 130 increases.

  An example of a state in which tacking of the front support portion 203 is not normally performed will be described with reference to FIG. In the example shown in FIG. 6, the proximal end of the front support 203 is in contact with the inner wall on the left side of the nozzle 180, but the stress received from the inner wall on the left is insufficient. But not fully bent backwards. Also, although the tip of the front support 203 is in contact with the right inner wall of the nozzle 180, the stress applied by the tip from the inner wall on the right is insufficient, so the front support 203 is not bent backward. . As a result, the intraocular lens 200 is moved forward without the front support portion 203 being tacked.

  The inventor of the present application has conceived the idea of suppressing the occurrence of the above-mentioned tacking abnormality by improving the structure of the intraocular lens. Specifically, the intraocular lens 1 (1A, 1B, 1C, 1D, 1E) according to the present disclosure does not have point symmetry with respect to the optical axis O of the optical unit, the structure of the front support and the structure of the back support. By using the structure, occurrence of tacking abnormality is suppressed. The details will be described below.

(First aspect)
The intraocular lens 1A of the first aspect of the present embodiment will be described with reference to FIGS. 7 and 8. First, a schematic configuration of the intraocular lens 1A will be described. The schematic configuration of the intraocular lens 1A to be described below is common to the intraocular lenses 1B, 1C, 1D, and 1E according to the other aspect and modification of this embodiment. The intraocular lens 1A includes an optical unit 2, a front support 3A, and a rear support 7A. The intraocular lens 1A of this embodiment is a so-called one-piece type intraocular lens in which the optical portion 2 and the pair of support portions 3A and 7A are integrally molded. However, at least a part of the technique exemplified in the present disclosure can also be applied to a so-called three-piece intraocular lens in which the optical part 2 and the pair of support parts 3A and 7A are formed as separate members. For the material of the intraocular lens 1A, various soft materials such as a simple substance such as BA (butyl acrylate) or HEMA (hydroxyethyl methacrylate), a composite material of acrylic acid ester and methacrylic acid ester, or the like can be adopted. The optical unit 2 applies a predetermined refractive power to the patient's eye. The shape of the optical part 2 is a disk shape. The optical axis O of the optical unit 2 extends in the vertical direction through the center of the optical unit 2. The pair of supports 3A, 7A support the optic 2 within the capsule of the patient's eye.

  In a state where the intraocular lens 1A is installed in the intraocular lens insertion device 100, the front support portion 3A is provided from the outer peripheral portion of the optical portion 2 to the front of the intraocular lens insertion device 100 (left in FIGS. 7 and 8). It curves and extends out. That is, the front support 3A has a loop shape curved in the circumferential direction, and the tip 5A of the front support 3A is a free end.

  In the state where the intraocular lens 1A is installed in the intraocular lens insertion device 100, the back support 7A is provided from the outer peripheral portion of the optical unit 2 to the rear of the intraocular lens insertion device 100 (rightward in FIGS. 7 and 8). It curves and extends out. That is, similarly to the front support 3A, the rear support 7A is also formed in a loop shape curved in the circumferential direction, and the distal end 9A of the rear support 7A is also a free end.

  The structures of the front support 3A and the rear support 7A of the intraocular lens 1A according to the first embodiment will be described in detail with reference to FIGS. 7 and 8. In the intraocular lens 1A of the first embodiment, the length of the front support 3A is longer than the length of the rear support 7A. More specifically, in the intraocular lens 1A according to the first embodiment as an example, the length of the front support 3A is the same as the front support in the intraocular lens 200 of the comparative point symmetry shape illustrated in FIGS. Longer than 203. Also, the length of the rear support 7A is shorter than the rear support 207 in the comparative intraocular lens 200 illustrated in FIGS.

  As shown in FIG. 8, when the front support 3A passes through the inside of the nozzle 180, the contact area and contact time of the front support 3A and the inner wall of the nozzle 180 are easily secured, so the front support 3A is accurate. It is easy to fold well. For example, as described with reference to FIG. 6, the stress received from the inner wall on the left side of the nozzle 180 may be insufficient in the base end 4A of the front support 3A. However, even in this case, since the front support 3A is long in the intraocular lens 1A, the contact area and the contact time of the tip 5A of the front support 3A and the inner wall on the right side of the nozzle 180 can be easily secured. As a result, as shown in FIG. 8, the distal end portion 5A of the front support 3A and its vicinity receive sufficient stress from the inner wall on the left side of the nozzle 180, and deform and move rearward accurately.

  In addition, as described with reference to FIGS. 4 and 5, the longer the rear support portion 207 is, the more likely it is that the rear support portion 207 is bent improperly. However, as shown in FIG. 8, in the intraocular lens 1A, since the back support 7A is short, improper bending is less likely to occur in the back support 7A. Thus, the rear support 7A is tacked with high accuracy.

  As described above, by forming the length of the front support 3A longer than the length of the rear support 7A, the accuracy of tacking of at least one of the front support 3A and the rear support 7A can be compared for comparison. It improves compared to the intraocular lens 200. In the intraocular lens 1A of the first embodiment, the accuracy of tacking of both the front support 3A and the rear support 7A is improved compared to the intraocular lens 200 for comparison.

  As shown in FIGS. 7 and 8, in the intraocular lens 1A according to the first embodiment, the thickness (the cross-sectional area in a cross section orthogonal to the length direction) from the proximal end 4A to the distal end 5A of the front support 3A The average value is smaller than the average value of the thickness from the proximal end 8A to the distal end 9A of the rear support 7A. As an example, in the first embodiment, the thickness of the front support 3A is greater than the thickness from the base 8A to the tip 9A of the rear support 7A over the entire range from the base 4A to the tip 5A. small. However, a portion of the front support 3A may be thinner than a portion of the rear support 7A. Further, in the example shown in FIGS. 7 and 8, the width of the front support 3A and the width of the rear support 7A when the intraocular lens 1A is viewed in the vertical direction are adjusted to the thickness of the front support 3A. The thickness of the rear support 7A is different. However, the thickness of the front support 3A and the thickness of the rear support 7A may be different by adjusting the thickness of the front support 3A and the rear support 7A in the vertical direction. In the intraocular lens 1A of the first embodiment, the thickness of the front support portion 3A is thinner than the front support portion 203 of the comparative point-symmetrical intraocular lens 200 illustrated in FIGS. In addition, the thickness of the rear support 7A is thicker than the rear support 207 in the comparative intraocular lens 200 illustrated in FIGS.

  As described with reference to FIGS. 4 and 5, the thinner the rear support portion 207, the easier it is for the rear support portion 207 to be bent improperly. However, as shown in FIG. 8, in the intraocular lens 1A, since the back support 7A is thick, it is difficult for the back support 7A to be bent improperly. Thus, the rear support 7A is tacked with high accuracy. Further, when the intraocular lens 1A is fixed in the capsule of the patient's eye, the stress received by the anterior support 3A from the capsule and the stress received by the posterior support 7A from the capsule tend to be close to each other. Thus, the position at which the optical unit 2 is held can easily approach the center of the capsule.

(Second aspect)
The intraocular lens 1B according to the second aspect of the present embodiment will be described with reference to FIGS. 9 and 10. In the intraocular lens 1B, the proximal end 4B of the front support 3B protrudes in the direction away from the optical axis O of the optical unit 2 as compared to the proximal end 8B of the rear support 7B. That is, the base end 4B of the front support 3B is provided with a protrusion 6B that protrudes outward. In addition, it is also possible to change the position which forms the protrusion part 6B, the magnitude | size of the protrusion part 6B, and a shape. In the present embodiment, the base end 4B represents a portion of the front support 3B in the range of 1/2 of the total length of the front support 3B from the position where the front support 3B and the optical unit 2 are connected.

  As described with reference to FIG. 6, when stress applied to the proximal end portion of the front support portion 203 from the inner wall on the left side of the nozzle 180 is insufficient, tacking is difficult to be appropriately performed. However, as shown in FIG. 10, in the second embodiment, the protrusion formed on the proximal end 4B of the front support 3B in the process of moving the intraocular lens 1B forward in the passage of the intraocular lens insertion device 100 The portion 6B is susceptible to stress from the inner wall of the nozzle 180 and the filling in the passage. As a result, the front support 3B is appropriately bent by the stress applied to the protrusion 6B. Further, the base end 8B of the rear support 7B is not provided with the same protrusion as the front support 3B. Accordingly, the proximal end 8B of the rear support 7B is unlikely to contact the inner wall, and the proximal end 8B is less likely to receive stress from the filling. Therefore, the stress applied to the proximal end 8B of the rear support 7B is unlikely to inhibit the proper movement and deformation of the intraocular lens 1B.

  In addition, when the intraocular lens 1B is fixed in the capsule, at least the shape, angle, weight ratio, thickness, surface roughness, etc. of the support parts 3B and 7B so that the center of the optical part 2 approaches the center of the capsule as much as possible. One has been adjusted. Therefore, the intraocular lens 1B is appropriately fixed in the capsule of the patient's eye while having the structure of the supports 3B and 7B which are not point-symmetrical.

(Third aspect)
An intraocular lens 1C according to a third aspect of the present embodiment will be described with reference to FIG. In the intraocular lens 1C, a friction that generates a friction force larger than the friction applied to the outer peripheral surface of the rear support 7C on at least the outer peripheral surface of the front support 3C facing in the direction away from the optical axis O of the optical unit 2 A force increasing portion 6C is provided. Although the frictional force increasing portion 6C illustrated in FIG. 11 is provided only on the outer peripheral surface of the front support portion 3C, the frictional force increasing portion also on at least one of the top surface, the bottom surface, and the inner peripheral surface of the front support portion 3C. 6C may be provided. Further, in the intraocular lens 1C illustrated in FIG. 11, the frictional force increasing portion 6C is provided by forming the physical unevenness on the surface of the front support portion 3C.

  As described with reference to FIG. 6, when stress applied to the proximal end portion of the front support portion 203 from the inner wall on the left side of the nozzle 180 is insufficient, tacking is difficult to be appropriately performed. In addition, if the stress in the vicinity of the front end portion of the front support portion 203 is insufficient from the inner wall on the right side of the nozzle 180, the front support portion 203 is unlikely to be bent backward. However, in the third embodiment, sufficient frictional force is generated between the proximal end 4C of the front support 3C and the inner wall of the nozzle 180 by the frictional force increasing portion 6C. Therefore, the front support 3C is appropriately bent by the stress applied to the proximal end 4C. In addition, a sufficient frictional force is also generated between the vicinity of the tip 5C of the front support 3C and the inner wall of the nozzle 180 by the frictional force increasing portion 6C. Therefore, the front support 3C is appropriately bent by the stress applied in the vicinity of the tip 5C. In addition, the frictional force generated between the front support 3C moving forward and the filling is also increased by the frictional force increasing portion 6C. Therefore, the tacking of the front support portion is likely to be appropriately performed. Furthermore, the frictional force applied to the rear support 7C is smaller than the frictional force applied to the front support 3C. Therefore, the frictional force applied to the rear support 7C is also unlikely to inhibit appropriate movement and deformation of the intraocular lens 1C.

  The frictional force increasing portion 6C illustrated in FIG. 11 is provided over the entire outer peripheral surface of the front support 3C. However, it is also possible to change the position and range in which the frictional force increasing portion 6C is provided. For example, the frictional force increasing portion 6C may be provided only on the outer peripheral surface of the proximal end 4C of the front support 3C, or may be provided only on the outer peripheral surface of the distal end 5C of the front support 3C. .

(First modification)
It is also possible to change the specific configuration of the frictional force increasing portion. An intraocular lens 1D of a first modified example provided with a frictional force increasing portion 6D will be described with reference to FIG. As shown in FIG. 12B, in the intraocular lens 1D of the first modified example, the average value of the thickness (height) HF in the vertical direction of the front support 3D is the thickness in the vertical direction of the rear support 7D ( Height) Larger than the average value of HB. As a result, the contact area between the inner wall of the nozzle 180 and the filling and the front support 3D is increased, so that the frictional force applied to the front support 3D is increased. That is, the surface of the front support portion 3D that faces in the direction (outward) away from the optical axis O is the frictional force increase portion 6D.

  As an example, in the first modification, the thickness HF in the vertical direction of the front support 3D is from the base 8D to the tip 9D of the rear support 7D over the entire length from the base 4D to the tip 5D. Is greater than the thickness HB in the vertical direction of the However, the thickness HF in the vertical direction of a part of the front support 3D may be larger than the thickness HB in the vertical direction of a part of the rear support 7D.

  Further, in the intraocular lens 1D, as shown in FIG. 12A, the average value of the thickness (width) TF of the front support 3D when viewed from above and below is the back support when viewed from above and below It is smaller than the average value of the thickness (width) TB of 7D. As a result, the average value of the thickness from the proximal end 4D to the distal end 5D of the front support 3D is smaller than the average value of the thickness from the proximal end 8D to the distal end 9D of the rear support 7D. There is. Therefore, as described in the first embodiment (see FIGS. 7 and 8), when the rear support 7D is tacked, it is difficult for the rear support 7D to be bent improperly. In addition, the average value of the thickness of front support part 3D may be the same as the average value of the thickness of back support part 7D. In this case, when the optical unit 2 is fixed in the capsule of the patient's eye, the optical unit 2 easily approaches the center of the capsule.

(2nd modification)
An intraocular lens 1E according to a second modification including the frictional force increasing portion 6E will be described with reference to FIGS. 13 and 14. As shown in FIG. 13, in the intraocular lens 1E of the second modified example, a frictional force increasing portion 6E is provided at the base end portion 4E of the front support portion 3E. As shown in FIGS. 13 and 14, the friction force increase portion 6E of the second modification is a rib extending upward and downward from the outer end of the front support 3E. By providing the frictional force increasing portion 6E, the contact area between the inner wall of the nozzle 180 and the filling, and the front support portion 3E increases, so the frictional force applied to the front support portion 3E increases.

  In addition, it is also possible to change the structure of the frictional force increase part 6E illustrated by FIG. 13 and FIG. For example, a rib-like frictional force increasing portion may be provided over the entire range from the proximal end 4E to the distal end 5E of the front support 3E. The rib-like frictional force increasing portion may extend to one of the upper side and the lower side of the front support 3E. Further, the rib-like frictional force increasing portion may be provided at a position other than the outer end of the front support 3E. Even in this case, when the intraocular lens 1E moves forward, the force applied from the filling to the front support 3E is increased by the frictional force increasing portion.

  The techniques disclosed in the above embodiments are merely examples. Therefore, it is also possible to change the technique illustrated in the above embodiment. For example, in the above embodiment, in order to facilitate understanding of the features of the first to third aspects, the first modification, and the second modification, each is illustrated separately. However, it is also possible to combine a plurality of techniques separately exemplified in the above embodiment. For example, two or more of the features of the first aspect, the second aspect, the third aspect, the first modification, and the second modification may be combined and adopted in one intraocular lens 1.

DESCRIPTION OF SYMBOLS 1 intraocular lens 2 optical part 3 front support part 4 base end part 5 tip part 6B protrusion part 6C, 6D, 6E friction force increase part 7 back support part 8 base end part 9 tip part 100 intraocular lens insertion instrument 180 nozzle 183 Insertion slot 310 Pushing member

Claims (8)

An intraocular lens inserted into an eye by an intraocular lens insertion device,
Disk-shaped optical section,
A front support portion having a distal end as a free end, with the intraocular lens being curvedly extended from the optical portion toward the front of the intraocular lens insertion device when the intraocular lens is installed in the intraocular lens insertion device; ,
A back support having a distal end as a free end and a curved extension extending from the optical unit toward the rear of the intraocular lens insertion device with the intraocular lens installed in the intraocular lens insertion device; ,
Equipped with
The intraocular lens characterized in that the front support portion and the rear support portion are formed in a structure which is not point symmetrical with respect to the optical axis of the optical portion. An intraocular lens according to claim 1, wherein
The intraocular lens characterized in that the front support portion and the rear support portion are formed in a structure that is not point-symmetrical with respect to the optical axis of the optical portion, so that their deformation characteristics are different from each other. An intraocular lens according to claim 1 or 2,
The intraocular lens insertion device is
A nozzle whose passage area decreases as it goes forward;
An insertion slot provided at the front end of the nozzle;
Equipped with
The intraocular lens is inserted into the eye through the insertion port by pushing the internal passage of the intraocular lens insertion device forward.
The intraocular lens characterized in that the front support portion is folded on the lens surface of the optical portion by being in contact with the inner wall of the nozzle in the process of pushing the intraocular lens forward. An intraocular lens according to claim 3, wherein
The intraocular lens insertion device includes a rod-like push-out member that pushes the intraocular lens forward,
The intraocular lens characterized in that the rear support portion is folded on the lens surface of the optical portion by being pushed forward by the pushing member. The intraocular lens according to claim 4, wherein
An intraocular lens, wherein the anterior support is longer than the posterior support. An intraocular lens according to claim 4 or 5,
An intraocular lens, wherein the average value of the thickness of the front support portion is smaller than the average value of the thickness of the rear support portion. An intraocular lens according to any one of claims 4 to 6,
An intraocular lens, wherein a proximal end portion of the front support portion protrudes in a direction away from an optical axis of the optical portion as compared with a proximal end portion of the rear support portion. An intraocular lens according to any one of claims 4 to 7, wherein
A frictional force increasing portion for generating a frictional force larger than the frictional force applied to the outer peripheral surface of the rear support portion is provided on the outer peripheral surface of the front support portion facing in a direction away from the optical axis of the optical portion. Intraocular lens characterized by.

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