Intraocular lens and intraocular lens insertion device

Abstract

An object of the technology of the present disclosure is to provide a technology that enables an intraocular lens to be easily fixed inside or outside a lens capsule.SOLUTION: The intraocular lens 1 includes an optical part 2 and a plurality of support parts 3 that are joined to the optical part 2 so as to extend from the outer periphery of the optical part 2 and support the optical part 2 in the eye. The support part 3 has a linear part 3A extending linearly from the outer periphery of the optical part 2, a bent part 3A bent from the distal end side of the linear part 3B, and a curved part 3B extending from the bent part 3C to the distal end side and having a plurality of curvature radii.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an intraocular lens and an intraocular lens insertion tool. [Background technology]

[0002] Intraocular lenses are used in cataract treatment to replace opacified human lenses and correct refraction. In typical cataract surgery, the opacified lens is removed and an intraocular lens is inserted into the lens capsule. However, if the lens capsule ruptures during or after surgery, or if lens dislocation occurs due to weakness of the zonules that support the lens, it becomes necessary to fix the intraocular lens independently of the lens capsule after capsule extraction. While intraocular lens suture and intrascleral fixation are known as techniques for fixing an intraocular lens independently of the lens capsule, these techniques are complex and highly invasive.

[0003] Non-Patent Document 1 proposes an intraocular lens that does not require suturing to the ciliary sulcus. In addition, Patent Documents 1 to 3 disclose intraocular lenses that are provided with support parts for fixing the intraocular lens in the eye. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] Tsuyoshi Sugiura, "An Attempt at a New Sulcus-Fixed Intraocular Lens that Does Not Require Sutures to the Sulcus in Aphakic Eyes," IOL&RS, Vol. 28, No. 4, December 26, 2014, pp. 421-430 [Patent documents]

[0005] [Patent Document 1] US Patent Application Publication No. 2017 / 354494 [Patent Document 2] Special Publication No. 06-507570 [Patent Document 3] Special Publication No. 2013-523259 Summary of the Invention [Problem to be solved by the invention]

[0006] An intraocular lens that can be easily fixed either inside or outside the lens capsule depending on the condition of the patient's eye is useful for reducing the burden on the surgeon and the patient. Non-Patent Document 1 and Patent Documents 1 to 3 above do not propose an intraocular lens that can be easily fixed either inside or outside the lens capsule.

[0007] The technology disclosed herein aims to provide a technology that allows an intraocular lens to be easily fixed inside or outside the lens capsule. [Means for solving the problem]

[0008] The intraocular lens disclosed herein includes an optical portion and a plurality of haptics that are bonded to the optical portion so as to extend from the outer periphery of the optical portion and support the optical portion inside the eye, the haptics having a straight portion that extends linearly from the outer periphery of the optical portion, a bent portion that bends from a distal end of the straight portion, and a curved portion that extends from the bent portion toward the distal end and has a plurality of radii of curvature. An intraocular lens having such a configuration can be fixed inside the lens capsule or outside the lens capsule according to the condition inside the patient's eye.

[0009] In the intraocular lens, the curved portion has a first curved portion disposed on the bent portion side and a second curved portion disposed on the distal end side of the first curved portion, and the first curved portion is The intraocular lens may support the optical portion by making line contact with the lens capsule when inserted into the lens capsule inside the eye, and the second curved portion may support the optical portion by making line contact with the ciliary sulcus when the intraocular lens is inserted outside the lens capsule inside the eye.

[0010] In the intraocular lens, the first curved portion may have a radius of curvature corresponding to the diameter of the lens capsule, the second curved portion may have a radius of curvature corresponding to the distance between the ciliary sulci, and the second curved portion may have a larger radius of curvature than the first curved portion.

[0011] In the intraocular lens, the first curved portion may have a radius of curvature of 4.0 mm to 5.5 mm, and the second curved portion may have a radius of curvature of 5.0 mm to 6.75 mm.

[0012] In the intraocular lens, the two support portions are arranged at positions symmetrical with respect to the center of the optical portion, and the distance between the connection positions of the first curved portion and the second curved portion in the two support portions may be 8.0 mm to 13.5 mm.

[0013] In the intraocular lens, the two support portions may be arranged at positions symmetrical with respect to the center of the optical portion, and the distance between the tips of the linear portions of the two support portions may be 8.0 mm to 11.0 mm.

[0014] In the intraocular lens, the diameter of the optical portion may be 5.0 mm to 7.5 mm, and the total length of the intraocular lens may be 14.5 mm or less.

[0015] In the intraocular lens, the support portion may be formed separately from the optical portion.

[0016] In the intraocular lens, the optical portion may have a center hole provided at an optical center and penetrating the optical portion in a thickness direction.

[0017] In the intraocular lens, the optical portion may have a peripheral hole provided near a position where the optical portion is joined to the support portion and penetrating the optical portion in a thickness direction.

[0018] In the intraocular lens, at least one peripheral hole may be provided near each of the joining positions of the plurality of support portions.

[0019] In the intraocular lens, the central hole and the peripheral holes may have a circular planar shape with a diameter of 1 mm or less.

[0020] The intraocular lens may be usable in any of an intracapsular fixation technique, an extracapsular fixation technique, and a technique in which the optical portion is fixed relative to the capsular bag.

[0021] In the intraocular lens, a toric surface may be formed on at least one of the front and rear surfaces of the optical portion, and the central hole may be formed along the contour line of the toric surface so that the height of the entire circumference of each inner wall is constant.

[0022] The present disclosure can also be seen from the aspect of an intraocular lens insertion device. For example, the device may be an intraocular lens insertion device for inserting an intraocular lens into an eye, the device including a storage section for storing the intraocular lens, and the intraocular lens may be stored in the storage section in advance. [Effects of the Invention]

[0023] According to the technique disclosed herein, an intraocular lens can be easily fixed inside or outside the lens capsule. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a plan view of an intraocular lens according to a first embodiment. [Figure 2] FIG. 2 is a plan view of the intraocular lens according to the first embodiment. [Figure 3] FIG. 3 is a plan view of the intraocular lens according to the first embodiment. [Figure 4] FIG. 4 is a plan view of the intraocular lens according to the second embodiment. [Figure 5] FIG. 5 is a plan view of an intraocular lens according to a first modification of the second embodiment. [Figure 6] FIG. 6 is a plan view of an intraocular lens according to Modification 2 of Embodiment 2. FIG. [Figure 7]FIG. 7 is a diagram showing an intraocular lens according to a third modification of the second embodiment. [Figure 8] FIG. 8 is a diagram showing an intraocular lens according to a fourth modification of the second embodiment. [Figure 9] FIG. 9 is a perspective view of an intraocular lens insertion device according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0025] An intraocular lens and an intraocular lens insertion device according to embodiments of the present disclosure will be described below with reference to the drawings. Note that the configurations of the following embodiments are examples, and the present invention is not limited to the configurations of these embodiments. Note that in this disclosure, the notation "X to Y" representing a numerical range means a numerical range including the lower and upper limits, which are the endpoints, unless otherwise specified.

[0026] <Embodiment 1> FIG. 1 is a plan view of an intraocular lens 1 according to this embodiment, viewed from the optical axis side. The intraocular lens 1 includes a lens body 2 (an example of the "optical portion" in the present disclosure) having a predetermined refractive power, and two haptics 3 that are inserted into and joined to side portions (edge ​​portions or lip portions) of the lens body 2 so that the tips of the haptics 3 extend from the outer periphery of the lens body 2 toward the optical axis front surface of the lens body 2. The two haptics 3 are positioned symmetrically about the center of the lens body 2, constituting a pair of haptics. The intraocular lens 1 is a three-piece type in which the lens body 2 and the two haptics 3 are formed separately. For example, the lens body 2 is formed of a known soft material, and the haptics 3 are formed of a hard material such as polyvinylidene fluoride, polymethyl methacrylate, polypropylene, or polyamide. The haptics 3 have a higher elastic modulus than the lens body 2 and support the lens body 2 in the eye.

[0027] The intraocular lens 1 according to this embodiment can be used both when fixed inside the lens capsule and when fixed outside the lens capsule. Based on the condition of the patient's lens, the surgeon can select a surgical method in which the lens capsule is left inside the eye and the intraocular lens 1 is inserted into the lens capsule and fixed therein, or a surgical method in which the lens capsule is removed from the eye and the intraocular lens 1 is fixed to the ciliary sulcus. The intraocular lens 1 according to this embodiment can be used with either surgical method and can be stably fixed in the eye with either surgical method. Furthermore, the intraocular lens 1 can fix the lens body 2 with two haptics 3. Compared to a lens with three haptics, the intraocular lens 1 can be inserted into the eye through a smaller incision, reducing the burden on the surgeon and the patient.

[0028] FIG. 1 and FIGS. 2 and 3 (described later) illustrate a horizontal axis A1 and a vertical axis A2 passing through the center of the lens body 2. Also, FIG. 1 and FIGS. 2 and 3 (described later) illustrate imaginary circles B1, B2, and B3 concentrically on the lens body 2. The imaginary circles B1, B2, and B3 have increasing diameters in this order: the diameter of imaginary circle B1 is 10 mm, the diameter of imaginary circle B2 is 12 mm, and the diameter of imaginary circle B3 is 14 mm. The imaginary circle B1 represents an imaginary lens capsule within the eye. The lens capsule in an adult is known to have a diameter of approximately 8 mm to 11 mm. The imaginary circle B2 represents an imaginary ciliary sulcus within the eye. The distance between the ciliary sulci in an adult is known to be approximately 10 mm to 13.5 mm. The imaginary circle B3 represents the overall length of an intraocular lens that complies with the approval standards for intraocular lenses in Japan. This approval standard stipulates that the total length of an intraocular lens must be within the range of 10.5 mm to 14.5 mm, and in Figs. 1 to 3, the diameter of the imaginary circle B3 is illustrated as 14.0 mm.

[0029] In the intraocular lens 1 according to this embodiment, the haptics 3 support the lens body 2 by making line contact with the lens capsule or the ciliary sulcus. The diameter of the lens body 2 is 5.0 mm to 7.5 mm, which is smaller than the imaginary circle B1 (lens capsule). The haptics 3 need to extend outward to make line contact with the lens capsule or the ciliary sulcus. Specifically, the haptics 3 have a straight portion 3A extending linearly from the outer periphery of the lens body 2, a bent portion 3B bending from the distal end side of the straight portion 3A, and a curved portion 3C extending distally from the bent portion 3B and having multiple radii of curvature. The lens body 2 side of the haptics 3 is the base end side of the haptics 3, and the opposite side is the distal end side of the haptics 3. The haptics 3 have a shape in which the straight portion 3A and the curved portion 3C are connected by the bent portion 3B.

[0030] The haptics 3 fix the lens body 2 in the eye by bringing the curved portion 3C into line contact with the lens capsule or ciliary sulcus. To extend the curved portion 3C toward the lens capsule or ciliary sulcus, the straight portion 3A extends linearly from the lens body 2 so as to be parallel to the longitudinal axis of the lens body 2. Considering the diameter of the lens body 2 and the diameter of the lens capsule, the distance D1 between the tips of the straight portions 3A of the two haptics 3 is preferably 8.0 mm to 11.0 mm. By setting the distance D1 within the above range for a lens body 2 with a diameter of 5.0 mm to 7.5 mm, the curved portion 3C can be efficiently extended to the lens capsule. Under the above approval standards, the total length of the intraocular lens 1 is 14.5 mm or less. Therefore, by setting the straight portion 3A to a useful length, the length of the curved portion 3C necessary for fixing the intraocular lens 1 can be ensured.

[0031] The bent portion 3B is provided to connect the straight portion 3A and the curved portion 3C. The bent portion 3B is disposed between the straight portion 3A and the curved portion 3C, and is a bent portion for realizing the support portion 3 continuing from the straight portion 3A to the curved portion 3C. Since the radius of curvature of the curved portion 3C is 4.0 mm to 6.75 mm, in order to ensure the length of the curved portion 3C with such a radius of curvature, the bent portion 3B is formed with a radius of curvature that is considerably smaller than that of the curved portion 3C. For example, the radius of curvature of the bent portion 3B is preferably about 1.5 mm.

[0032] The curved portion 3C has a first curved portion 30C located on the bent portion 3B side (proximal end side) and a second curved portion 31C located distal to the first curved portion 30C. The first curved portion 30C supports the lens body 2 by making line contact with the lens capsule when the intraocular lens 1 is inserted into the lens capsule. The second curved portion 31C supports the lens body 2 by making line contact with the ciliary sulcus when the intraocular lens 1 is inserted outside the lens capsule. The first curved portion 30C and the second curved portion 31C are formed with different radii of curvature. The first curved portion 30C has a radius of curvature corresponding to the diameter of the lens capsule, and the second curved portion 31C has a radius of curvature corresponding to the distance between the ciliary sulci. Because the ciliary sulcus is located outside the lens capsule in the eye, the second curved portion 31C has a larger radius of curvature than the first curved portion 30C.

[0033] In Fig. 1 and Figs. 2 and 3 described below, points where the radius of curvature of the support portion 3 changes (inflection points) are indicated by imaginary black circles C. The support portion 3 has inflection points at the boundary point between the straight portion 3A and the bent portion 3B, the boundary point between the bent portion 3B and the first curved portion 30C, and the boundary point between the first curved portion 30C and the second curved portion 31C. In the example shown in Fig. 1, the boundary point between the bent portion 3B and the first curved portion 30C is located on an imaginary circle B1, and the boundary point between the first curved portion 30C and the second curved portion 31C is located on an imaginary circle B2.

[0034] For example, since the diameter of the lens capsule is approximately 8 mm to 11 mm, the radius of curvature of the first curved portion 30C for making line contact with the lens capsule is preferably 4.0 mm to 5.5 mm. FIG. 2 is a plan view of the intraocular lens 1 when the intraocular lens 1 is inserted into the lens capsule. The first curved portion 30C is along an imaginary circle B1 representing the lens capsule. FIG. 2 is a conceptual diagram showing the state in which the first curved portion 30C is in line contact with the lens capsule. By setting the radius of curvature of the first curved portion 30C in the range of 4.0 mm to 5.5 mm, the first curved portion 30C can be made to fit along the lens capsule and make contact with the lens. This allows for line contact with the capsule, making it possible to easily fix the intraocular lens 1 in the lens capsule.

[0035] Furthermore, since the distance between the ciliary sulci is approximately 10 mm to 13.5 mm, the radius of curvature of the second curved portion 31C is preferably 5.0 mm to 6.75 mm. FIG. 3 is a plan view of the intraocular lens 1 when inserted outside the lens capsule. The second curved portion 31C follows an imaginary circle B2 representing the ciliary sulcus. FIG. 3 is a conceptual diagram showing a state in which the second curved portion 31C is in line contact with the ciliary sulcus. By setting the radius of curvature of the second curved portion 31C in the range of 5.0 mm to 6.75 mm, the second curved portion 31C can be aligned along the ciliary sulcus and made in line contact with it. This allows the intraocular lens 1 to be easily fixed in the ciliary sulcus.

[0036] It is preferable that the distance D2 between the connecting positions of the first curved portion 30C and the second curved portion 31C in the two support parts 3 is 8.0 mm to 13.5 mm. By setting the distance D2 in this range, it is possible to ensure the lengths of the first curved portion 30C and the second curved portion 31C necessary to fix the intraocular lens 1 while keeping the intraocular lens 1 within the total length within the above-mentioned approval standards.

[0037] In cataract surgery, intraocular lenses are commonly inserted into the lens capsule. However, postoperative dislocation of the intraocular lens can sometimes require reoperation. This can occur when an intraocular lens is inserted outside the lens capsule in patients with weakened lens capsules and the zonules that support them. In addition, intrascleral fixation, a procedure in which the haptics of the intraocular lens are inserted into the sclera, can lead to problems such as tilting or decentration of the intraocular lens. If the haptics of the intraocular lens are too short during intrascleral fixation, the anterior chamber depth can become shallow, resulting in power deviations, which can lead to intraoperative and postoperative complications, or even damage to the haptics. Performing intrascleral fixation to prevent these problems increases the burden on the surgeon and patient.

[0038] The above-mentioned Non-Patent Document 1 and Patent Documents 1-3 do not disclose haptics with two or more radii of curvature. Haptics with only one radius of curvature cannot achieve line contact with either the lens capsule or the ciliary sulcus. As a result, such intraocular lenses cannot be used for fixation both within the lens capsule and outside the lens capsule. For example, if an intraocular lens intended for fixation within the lens capsule is fixed to the ciliary sulcus, the haptics will make point contact with the ciliary sulcus, resulting in insufficient fixation of the intraocular lens. Insufficient fixation of the intraocular lens can cause the intraocular lens, particularly the lens body, to tilt within the eye, resulting in the problem of not being able to achieve the desired visual acuity. On the other hand, the intraocular lens 1 according to this embodiment includes a curved portion 3C with two radii of curvature, allowing it to be easily fixed within or outside the lens capsule depending on the patient's intraocular condition. Since the intraocular lens 1 is sufficiently fixed within the eye, it can prevent tilt within the eye and provide the patient with the desired visual acuity.

[0039] Furthermore, since the intraocular lens 1 according to this embodiment can be fixed outside the lens capsule, there is no need for intrascleral fixation surgery, which reduces the burden on the surgeon and the patient. Furthermore, since the intraocular lens 1 has haptics 3 that are long enough to be fixed outside the lens capsule, the fixed position of the lens body 2 in the eye is not too shallow, which prevents deviation in power. Furthermore, the intraocular lens 1 has relatively long haptics 3 compared to the intraocular lenses disclosed in Non-Patent Document 1 and Patent Documents 1 to 3. Therefore, even if intraocular lens suturing surgery or intrascleral fixation surgery using the intraocular lens 1 is adopted, it is easy to fix the haptics 3 outside the lens capsule.

[0040] <Embodiment 2> Next, an intraocular lens according to embodiment 2 will be described. In recent years, a surgical technique (Optic capture) has been developed in which the anterior capsule is incised, the lens body of the intraocular lens is inserted into the lens capsule through the incision, and the support parts are extended from the incision to the outside of the lens capsule and fixed to the outside of the capsule, such as the ciliary sulcus (hereinafter, this technique is referred to as "optical capture"). When optic capture is used, there is a complication of fluid accumulation between the lens body and the posterior capsule (capsular There have been confirmed cases of capsule block syndrome (hereafter referred to as "capsule block syndrome"). Capsule block syndrome can cause myopia due to the optical part of the intraocular lens being displaced forward, or can lead to glaucoma due to the accumulation of pigment (melanin pigment in the iris) caused by the optical part rubbing against the iris. For this reason, if capsule block syndrome occurs, a procedure is required to incise the posterior capsule with a YAG laser to allow the accumulated fluid to escape, which increases the burden on the patient.

[0041] Therefore, an object of this embodiment is to provide an intraocular lens that can prevent the onset of capsule block syndrome.

[0042] 4 is a plan view of the intraocular lens 1 according to this embodiment, seen from the anterior capsule side, in a state where it is fixed in the eye by optic capture. Note that the same components as those of the intraocular lens 1 according to embodiment 1 shown in FIGS. 1 to 3 are given the same reference numerals, and their description will be omitted.

[0043] As shown in Fig. 4, when optic capture is employed, the anterior capsule of the lens capsule 50 is incised to form an incision 51, and the lens body 2 is inserted into the lens capsule 50 through the incision 51. The haptics 3 extend from the incision 51 to the outside of the lens capsule 50, and are fixed to the ciliary sulcus by aligning the second curved portion 31C along the ciliary sulcus. Note that the ciliary sulcus is not shown in Fig. 4.

[0044] In this embodiment, the lens body 2 of the intraocular lens 1 has a central hole 4 provided at the optical center and penetrating the lens body 2 in the thickness direction. Providing a hole at the optical center of an intraocular contact lens (ICL) used for myopia treatment and the like is described in Non-Patent Document 2 (Takushi Kawamorita, "Hole Implantable Collamer Lens KS-AquaPORT"). TM"," Science of Vision, Vol. 34, No. 4, December 28, 2013, pp. 148-151), and it is known that providing a hole at the optical center does not affect the optical characteristics (imaging characteristics). For this reason, it is appropriate to provide a hole at the optical center in the intraocular lens 1 according to this embodiment as well. The central hole 4 has a circular planar shape, and its diameter is preferably 1.0 mm or less. Furthermore, the diameter of the central hole 4 is more preferably 0.5 mm or less, and even more preferably 0.35 mm or less.

[0045] The diameter of the central hole 4 is preferably set to a size that does not affect the optical characteristics (imaging characteristics) of the lens body 2. Non-Patent Document 2 describes that in a perforated posterior chamber phakic lens, if the diameter of the hole provided in the lens is approximately 0.4 mm, sufficient circulation of aqueous humor can be ensured while suppressing optical loss. Therefore, the diameter of the central hole 4 is preferably approximately 0.4 mm in order to ensure sufficient circulation of aqueous humor while suppressing optical loss. Note that the planar shape of the central hole 4, which is used to suppress optical loss in the lens body 2, is not limited to a circle. The planar shape of the central hole 4 can be selected as appropriate from any shape, such as an ellipse or another polygon.

[0046] The intraocular lens 1 according to this embodiment has a central hole 4, which can prevent fluids such as aqueous humor from accumulating between the posterior capsule and the lens body 2. Aqueous humor circulates inside and outside the lens capsule via the central hole 4 of the lens body 2. This allows the intraocular lens 1 according to this embodiment to ensure the fluidity of aqueous humor in front of and behind the lens body 2, and can prevent the onset of capsule block syndrome.

[0047] The intraocular lens 1 according to this embodiment can be fixed inside or outside the lens capsule, similarly to the first embodiment. It can be used for both extracapsular fixation and optic capture (an example of a "technique for fixing the optical part to the capsular bag" in this disclosure).

[0048] <Variation 1> Next, an intraocular lens according to Modification 1 of Embodiment 2 will be described. FIG. 5 is a plan view of an intraocular lens 1 according to this modification, as viewed from the anterior capsule side, fixed in the eye by optic capture. In this modification, the lens body 2 has peripheral holes 5 provided near the bonding positions with the haptics 3 and penetrating the optical portion in the thickness direction. One peripheral hole 5 is provided near each of the haptics 3 (two in this modification), but it is sufficient that one or more peripheral holes 5 are provided in the lens body 2. Furthermore, at least one peripheral hole 5 may be provided near each haptic 3. In this modification, the two peripheral holes 5 are arranged in positions point-symmetrical to each other with respect to the central hole 4, but the peripheral holes 5 may be located near the bonding positions with the haptics 3.

[0049] The peripheral holes 5 have a circular planar shape similar to the central hole 4, and preferably have a diameter of 1 mm or less. Similarly to the central hole 4, the diameter of the peripheral holes 5 is more preferably 0.5 mm or less, and even more preferably 0.35 mm or less.

[0050] The intraocular lens 1 according to this modification is provided with a central hole 4 and peripheral holes 5, which can prevent fluids such as aqueous humor from accumulating between the posterior capsule and the lens body 2. As a result, the intraocular lens 1 according to this modification can ensure the fluidity of aqueous humor in front of and behind the lens body 2, and can prevent the onset of capsule block syndrome.

[0051] <Variation 2> Next, an intraocular lens according to Modification 2 of Embodiment 2 will be described. Fig. 6 is a plan view of the intraocular lens 10 according to this modification, viewed from the optical axis side. The intraocular lens 10 according to this modification is a one-piece lens that is preferably used in a surgical procedure in which the lens is fixed inside the lens capsule.

[0052] The intraocular lens 10 includes a lens body 10a (an example of the "optical portion" in the present disclosure) having a predetermined refractive power, and haptics 10b and haptics 10c connected to the lens body 10a. The haptics 10b and haptics 10c are provided to hold the lens body 10a within the lens capsule, and each haptic 10b, 10c has a long, flat plate shape. The haptics 10b and haptics 10c are connected to the lens body 10a via a joint 10d. The intraocular lens 10 is a so-called one-piece type in which the lens body 10a, haptics 10b, haptics 10c, and joint 10d are integrally molded using the same material. The intraocular lens 10 is formed, for example, from a flexible resin material.

[0053] In this modification, similar to the first modification, the lens body 10a of the intraocular lens 10 has a central hole 14 located at the optical center and penetrating the lens body 10a in the thickness direction. The central hole 14 has a circular planar shape, and its diameter is preferably 1 mm or less. The diameter of the central hole 14 is more preferably 0.5 mm or less, and even more preferably 0.35 mm or less.

[0054] Furthermore, in this modification, similar to the above modification 1, the lens body 10a has peripheral holes 15 that are provided near the joints 10d (an example of a "joining position") with the support portions 10b and that penetrate the lens body 10a in the thickness direction. One peripheral hole 15 is provided near each of the support portions 10b (two in this modification), but it is sufficient that one or more peripheral holes 15 are provided in the lens body 2. Furthermore, at least one peripheral hole 15 may be provided near each of the support portions 3. Note that in this modification, the two peripheral holes 15 are arranged in positions that are point-symmetrical to each other with respect to the central hole 14, but it is sufficient that the positions of the peripheral holes 15 are near the joints 10d.

[0055] Peripheral holes 15 have a circular planar shape similar to central hole 14, and preferably have a diameter of 1 mm or less. Similarly to central hole 14, peripheral holes 15 have a diameter of more preferably 0.5 mm or less, and even more preferably 0.35 mm or less.

[0056] The intraocular lens 10 according to this modification has a central hole 14 and peripheral holes 15, which can prevent fluids such as aqueous humor from accumulating between the posterior capsule and the lens body 10a. As a result, the intraocular lens 10 according to this modification can ensure the fluidity of aqueous humor in front of and behind the lens body 10a, and can prevent the onset of capsule block syndrome.

[0057] <Variation 3> Next, an intraocular lens according to Modification 3 of Embodiment 2 will be described. FIGS. 7(a) to 7(c) are diagrams showing the lens body 2 of the intraocular lens according to this modification. The intraocular lens according to this modification is a toric lens used to treat astigmatism. Haptics are omitted from FIG. 7. The intraocular lens according to this modification is a three-piece lens, but may also be a one-piece lens. In addition, FIGS. 7(a) to 7(c) will be described assuming that an XY plane perpendicular to the optical axis of the lens body 2 is set, and the X and Y axes are perpendicular to each other. Furthermore, a Z axis perpendicular to the XY plane is set, and the intersection of the X and Y axes is set as the optical center, which is also set as the origin O.

[0058] The lens body 2 has a front optical surface 20 that is spherical or aspherical and does not have a toric surface, and a rear optical surface 21 that is a toric surface. In the example shown in Figures 7(a) to (c), the steepest meridian overlaps the X-axis, and the steepest meridian overlaps the Y-axis. In this way, the lens body 2 having a toric surface may also be provided with a central hole 4 and peripheral holes 5, which are through-holes. As in the above-mentioned first modification, the central hole 4 may be provided without providing peripheral holes 5. By providing the central hole 4 and peripheral holes 5, the intraocular lens according to this modification can ensure the fluidity of aqueous humor in front of and behind the lens body 2 and suppress the onset of capsule block syndrome.

[0059] <Variation 4> Next, an intraocular lens according to Modification 4 of Embodiment 2 will be described. Fig. 8 is a diagram showing the lens body 2 of the intraocular lens according to this modification. In Fig. 8, as in Fig. 7(c), an XY plane perpendicular to the optical axis of the lens body 2 is set, and the X axis and Y axis are perpendicular to each other. The intersection of the X axis and the Y axis is set as the optical center, and the optical center is set as the origin O. In the example shown in Fig. 8, the most extreme meridian overlaps the X axis, and the least extreme meridian overlaps the Y axis.

[0060] Figure 8 shows the lens body 2 as viewed from the rear side of the optical axis. In the lens body 2, the optical surface 20 on the front side does not have a toric surface, and the optical surface 21 on the rear side is a toric surface. Figure 8 also shows the contour lines of the optical surface 21. The contour lines form an ellipse with the major axis overlapping the Y axis and the minor axis overlapping the X axis.

[0061] In the intraocular lens according to this modification, the central hole 4 is formed along the contour lines of the toric surface so that the height of the inner wall on the optical surface 21 side (toric surface side) is constant all around. In FIG. 8, the innermost contour line coincides with the outline of the central hole 4. In holes with uniform inner wall heights, the flow of fluid through the hole can be expected to be uniform. As a result, the intraocular lens according to this modification ensures the fluidity of aqueous humor in front of and behind the lens body 2 by making the flow of liquid through the central hole 4 uniform, thereby preventing the onset of capsule block syndrome. Note that the intraocular lens according to this modification may also have a peripheral hole 5 formed in the lens body 2.

[0062] According to the intraocular lens of the second embodiment described above, it is possible to prevent the onset of capsule block syndrome. Alternatively, as in the second modified example, it may be a one-piece type.

[0063] For example, the intraocular lens according to this embodiment can be summarized as follows. <Appendix 1> an optical unit; a plurality of support parts that are joined to the optical part so as to extend from the outer periphery of the optical part and support the optical part in the eye; An intraocular lens comprising: The optical portion has a center hole provided at the optical center and penetrating the optical portion in a thickness direction. Intraocular lens. <Appendix 2> the optical portion is provided in the vicinity of a joining position with the support portion, and has a peripheral hole penetrating the optical portion in a thickness direction. 1. An intraocular lens as described in Appendix 1. <Appendix 3> At least one peripheral hole is provided near each of the joining positions of the plurality of support portions. 1. An intraocular lens as described in Appendix 2. <Appendix 4> The central hole and the peripheral holes have a circular planar shape with a diameter of 1 mm or less. 4. An intraocular lens according to claim 2 or 3. <Appendix 5> The present invention can be used in any of intracapsular fixation techniques, extracapsular fixation techniques, and techniques for fixing the optical part to the capsular bag. 5. An intraocular lens according to any one of claims 1 to 4. <Appendix 6> a toric surface is formed on at least one of the front and rear surfaces of the optical portion; The central hole is formed along the contour line of the toric surface so that the height of the entire periphery of each inner wall is constant. 6. An intraocular lens according to any one of claims 1 to 5.

[0064] <Embodiment 3> Next, an intraocular lens insertion device for inserting the intraocular lens 1 according to the above-mentioned first and second embodiments into the eye will be described. Fig. 9 is a perspective view of the intraocular lens insertion device 100 according to this embodiment, viewed obliquely from above. The intraocular lens insertion device 100 includes a nozzle body 101 and a plunger 300 inserted into the nozzle body 101. The nozzle body 101 has a cylindrical shape with a substantially rectangular cross section, and includes a rear end portion 101c at one end that is open on the entire surface, and a tip portion 101a at the other end that is tapered to a narrow nozzle portion 150 and has an opening 101b at its tip.

[0065] In the following description, the direction from the rear end 101c of the nozzle body 101 to the tip end 101a is referred to as "front," the opposite direction as "rear," the top of the paper in Figure 9 is referred to as "up," the opposite direction as "down," the left side as you face forward is referred to as "left," and the opposite direction as "right." The top side corresponds to the front side of the optical axis of the lens body 2, the bottom side corresponds to the rear side of the optical axis of the lens body 2, and the front side corresponds to the extrusion direction by the plunger 300.

[0066] The tip portion 101a provided at the front end of the nozzle body 101 is internally connected to the nozzle portion 150 and has a cylindrical shape with a smaller diameter than the nozzle portion 150. Near the rear end portion 101c of the nozzle body 101, a plate-like protrusion protrudes upward and downward, and the surgeon inserts the plunger 300 into the nozzle. A holding portion 110, which can be used to hook a finger when pushing the nozzle body 101 toward the tip end, is provided integrally with the nozzle body 101. The nozzle body 101 also has a stage portion 120, which is provided behind the nozzle portion 150 and stores the intraocular lens 1. The nozzle portion 150 and the tip portion 101a are located closer to the tip end than the stage portion 120 and are connected to the stage portion 120. The stage portion 120 is connected to a stage lid portion 130, the upper side of which can be opened and closed. The stage portion 120 and the stage lid portion 130 in the closed state form a storage portion that serves as a space for storing the intraocular lens 1. The bottom side of the storage portion constitutes the stage portion 120, and the top side of the storage portion constitutes the stage lid portion 130. The space for storing the intraocular lens can be opened by opening the stage lid portion 130. A holding member 500 is attached to the stage portion 120 from the underside of the nozzle body 101. The holding member 500 stably holds the intraocular lens 1 within the stage part 120 even before use (during transportation).

[0067] The nozzle body 101, plunger 300, and holding member 500 of the intraocular lens insertion device 100 are made of resin such as polypropylene. Polypropylene has a proven track record as a material for medical devices and is a highly reliable material with excellent chemical resistance.

[0068] Furthermore, a confirmation window 170 is formed in a portion of the stage lid 130 by making the confirmation window 170 thinner than the surrounding area, thereby enabling the inside of the stage lid 130 to be viewed. The degree to which the confirmation window 170 should be made thinner than the surrounding area can be determined appropriately based on the material from which the stage lid 130 is made and the visibility of the intraocular lens through the confirmation window 170. Furthermore, by forming the confirmation window 170, it is expected that there will be an effect of reducing molding defects when the stage lid 130 is molded.

[0069] The intraocular lens insertion device 100 according to this embodiment is a preset type in which the intraocular lens 1 shown in Fig. 1 is stored in advance in the stage part 120 at the time of shipment. In the preset type intraocular lens insertion device 100, during manufacturing, the stage lid part 130 is opened, the holding member 500 is attached to the stage part 120, and the intraocular lens is placed on the stage part 120 with the front side of the optical axis facing up. Then, the intraocular lens insertion device 100 is shipped after the stage lid part 130 is closed.

[0070] The stage lid 130 is also provided with an injection hole 180 for injecting a viscoelastic substance onto the stage 120 before moving the intraocular lens 1 forward. The viscoelastic substance functions as a lubricant that reduces friction that occurs when the intraocular lens 1 is moved. The injection hole 180 is a hole that connects the inside and outside of the storage section when the stage lid 130 is closed. An operator, assistant, or nurse can use a syringe to inject the viscoelastic substance onto the stage 120 through the injection hole 180.

[0071] The stage lid 130 is also provided with a guide wall 190 for guiding the injection needle for injecting the viscoelastic material into the injection hole 180. The guide wall 190 is provided on the stage lid 130 so as to surround the injection hole 180 from the left side of the open end, passing through the front side of the open end, and continuously surrounding the right side of the open end. The surgeon abuts the injection needle of the syringe for injecting the viscoelastic material against the guide wall 190 and then moves the tip of the injection needle into the injection hole 180. In this way, the guide wall 190 can guide the injection needle for injecting the viscoelastic material into the injection hole 180. The surgeon then wets the intraocular lens with the viscoelastic material while keeping the stage lid 130 closed, and then removes the holding member 500. The surgeon then pushes the plunger 300 toward the tip of the nozzle body 101. The tip 101a communicates with the stage 120 via the nozzle 150, and the intraocular lens 1 pressed by the plunger 300 can pass through the nozzle 150 and move within the tip 101a. With the tip 101a of the intraocular lens insertion device 100 inserted into an incision made in the eye, the intraocular lens is pressed by the plunger 300, and the intraocular lens 1 is released into the eye from the opening 101b. By performing these operations, the intraocular lens insertion device By using 100, the intraocular lens 1 can be inserted into the eye through the incision.

[0072] The plunger 300 is inserted into the nozzle body 101 from the rear end portion 101c and is movable back and forth. By moving the plunger 300 forward, the intraocular lens insertion device 100 ejects the intraocular lens 1 from the nozzle portion 150, the tip portion 101a, and the opening 100b into the eye.

[0073] The intraocular lens 1 according to the present embodiment can be fixed in the eye whether it is inserted inside or outside the lens capsule by using the intraocular lens insertion device 100, and therefore, when inserted outside the lens capsule, it can be used in cases where the lens capsule is damaged, the zonules are weak, or the intraocular lens is dislocated. The intraocular lens 1 according to the present embodiment can be inserted into an eye that does not have a lens capsule, and is therefore advantageous over conventional intraocular lenses that can only be inserted inside the lens capsule because it can be inserted both inside and outside the lens capsule.

[0074] The above is a description of the present embodiment. However, the intraocular lens 1 and intraocular lens insertion device 100 disclosed herein are not limited to the above embodiment and may be modified in various ways within the scope of the technical concept of the present invention. For example, while the intraocular lens 1 according to the above embodiment has a curved portion 3C with two different radii of curvature, it may have a curved portion 3C with three or more different radii of curvature, or the curvature radius of the curved portion 3C may change in multiple stages. The size of the intraocular lens capsule and ciliary sulcus varies from person to person. By changing the curvature of the curved portion 3C to three or more different values ​​or in multiple stages, it is possible to realize an intraocular lens 1 suitable for fixing the lens capsule and ciliary sulcus, which vary from person to person. Furthermore, by matching the radii of curvature of the first curved portion 30C and the second curved portion 31C and adjusting the curvature radius of the curved portion to suit only one of the lens capsule curvature or the ciliary sulcus curvature, it is possible to convert the intraocular lens into an intracapsular lens or a ciliary sulcus-specific intraocular lens.

[0075] In the above embodiment, the intraocular lens insertion instrument 100 is a preset type in which the intraocular lens 1 is stored in advance, but the intraocular lens insertion instrument 100 disclosed herein is not limited to this. For example, the intraocular lens insertion instrument 100 may be a separate type in which the surgeon places the intraocular lens 1 in the intraocular lens insertion instrument 100 when using it.

[0076] The optical portion (lens body 2) may be not only a single focal optical portion, but also an optical portion having additional functions such as toric, multifocal, or EDOF (extended depth of focus). [Explanation of symbols]

[0077] 1: Intraocular lens 2: Lens body 3: Support part 3A: Straight section 3B: Bent part 3C: Curved section 30C: 1st curve part 31C: 2nd curve part 100: Intraocular lens insertion device 101: Nozzle body 101a:Tip 101b: Opening 101c: Rear end 110: Hold section 120: Stage section 130: Stage lid 150: Nozzle part 170: Check window 180: Injection hole 190: Guide wall 300: Plunger 500: Holding member

Claims

1. an optical unit; a plurality of support parts that are joined to the optical part so as to extend from the outer periphery of the optical part and support the optical part in the eye; An intraocular lens comprising: The support portion is a linear portion extending linearly from the outer periphery of the optical portion; a bending portion bent from a tip side of the straight portion; a curved portion extending from the bent portion toward the tip end and having a plurality of radii of curvature; An intraocular lens comprising:

2. the curved portion has a first curved portion disposed on the bent portion side and a second curved portion disposed on the distal end side of the first curved portion, the first curved portion supports the optical portion by making line contact with the lens capsule when the intraocular lens is inserted into the lens capsule inside the eye; the second curved portion supports the optical portion by making line contact with the ciliary sulcus when the intraocular lens is inserted outside the lens capsule inside the eye. The intraocular lens of claim 1 .

3. the first curved portion has a radius of curvature corresponding to the diameter of the lens capsule; the second curved portion has a radius of curvature corresponding to the distance between the ciliary sulci, The second curved portion has a larger radius of curvature than the first curved portion. The intraocular lens according to claim 2.

4. The radius of curvature of the first curved portion is 4.0 mm to 5.5 mm, The radius of curvature of the second curved portion is 5.0 mm to 6.75 mm. The intraocular lens according to claim 3.

5. The two support portions are arranged at positions symmetrical with respect to the center of the optical portion, The distance between the connection positions of the first curved portion and the second curved portion in the two support portions is 8.0 mm to 13.5 mm. The intraocular lens according to claim 2.

6. The two support portions are arranged at positions symmetrical with respect to the center of the optical portion, The distance between the tip ends of the straight portions of the two support portions is 8.0 mm to 11.0 mm. The intraocular lens of claim 1 .

7. the diameter of the optical portion is 5.0 mm to 7.5 mm; The total length of the intraocular lens is 14.5 mm or less. An intraocular lens according to any one of claims 1 to 6.

8. The support portion is formed separately from the optical portion. An intraocular lens according to any one of claims 1 to 6.

9. The optical portion has a center hole provided at the optical center and penetrating the optical portion in a thickness direction. The intraocular lens of claim 1 .

10. the optical portion is provided in the vicinity of a joining position with the support portion, and has a peripheral hole penetrating the optical portion in a thickness direction. The intraocular lens according to claim 9.

11. At least one peripheral hole is provided near each of the joining positions of the plurality of support portions. The intraocular lens of claim 10.

12. The central hole and the peripheral holes have a circular planar shape with a diameter of 1 mm or less. The intraocular lens according to claim 10 or 11.

13. The present invention can be used in any of intracapsular fixation techniques, extracapsular fixation techniques, and techniques for fixing the optical part to the capsular bag. The intraocular lens according to claim 9 or 10.

14. a toric surface is formed on at least one of the front and rear surfaces of the optical portion; The central hole is formed along the contour line of the toric surface so that the height of the entire periphery of each inner wall is constant. The intraocular lens according to claim 9 or 10.

15. An intraocular lens insertion device for inserting an intraocular lens into an eye, a storage section for storing the intraocular lens; The intraocular lens according to any one of claims 1 to 6 is stored in the storage section in advance. Intraocular lens insertion device.

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