Intraocular lens insertion device

Abstract

To provide an intraocular lens insertion device allowing optimal insertion of an intraocular lens into a patient's eye regardless of the power of the intraocular lens to be inserted into the patient's eye.SOLUTION: An intraocular lens insertion device in which one intraocular lens is preloaded out of a plurality of types of intraocular lenses having different thickness of an optical part according to the power, includes a cylindrical insertion device body 10 in which the intraocular lens is preloaded, a plunger 12 for pushing out the intraocular lens disposed in a cylindrical inner part of the insertion device body 10, along a push-out shaft, and change means 30 for selectively changing an advancing path in which the plunger 12 advances in the cylindrical inner part of the insertion device body 10. The advancing path is determined by the change means 30 according to the power of the intraocular lens to be preloaded.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present disclosure relates to an intraocular lens insertion tool for inserting an intraocular lens into an eye. [Background technology]

[0002] Conventionally, a commonly used surgical method for cataracts is to insert a foldable soft intraocular lens into the eye instead of the crystalline lens. In some cases, the intraocular lens is inserted in front of the crystalline lens to correct the refractive power of the eye. An intraocular lens insertion tool called an injector is sometimes used to insert the intraocular lens into the eye.

[0003] As such an injector, an intraocular lens insertion device is known that pushes out an intraocular lens in a hollow portion where an inner diameter gradually decreases toward the tip of an insertion part with a notch formed at the tip, folding the intraocular lens small and ejecting it from the tip to the outside (for example, Patent Document 1). The intraocular lens insertion device of Patent Document 1 suppresses tacking failure of the front support part by making the tip of the plunger, which moves straight along the extrusion axis, oblique toward the inner wall surface. However, since the diopter of the patient's eye varies from person to person, intraocular lenses are used selectively (for example, Patent Document 2). In other words, it is common for a given model name of intraocular lens to be prepared with multiple intraocular lenses that differ only in the power (refractive power) of the optical part. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-190023 A [Patent Document 2] JP 2010-207279 A Summary of the Invention [Problem to be solved by the invention]

[0005] Here, the lower the power of the intraocular lens to be mounted, the thinner the optical part becomes, and the lower the rigidity of the optical part tends to be. Therefore, in the intraocular lens insertion device of the cited document 1, if the tip of the plunger is uniformly inclined toward the inner wall surface, there is a concern that the optical part is likely to be unintentionally deformed while pushing out the intraocular lens with a low power, which has a thin optical part and low rigidity.

[0006] Therefore, the present disclosure has been made to solve the above-mentioned problems, and aims to provide an intraocular lens insertion instrument that can suitably insert an intraocular lens into a patient's eye regardless of the power of the intraocular lens to be inserted into the patient's eye. [Means for solving the problem]

[0007] An intraocular lens insertion device provided by a typical embodiment of the present disclosure is an intraocular lens insertion device in which one intraocular lens is preloaded from among a plurality of types of intraocular lenses that differ only in thickness of an optical portion depending on the power, the intraocular lens being preloaded, the intraocular lens being preloaded in a cylindrical insertion device body, a plunger that pushes out the intraocular lens arranged inside the cylindrical insertion device body along an extrusion axis, Selected according to the plurality of types of intraocular lenses, The plunger of The insertion device body In The trajectory of the movement inside the cylinder Change Change Work like A change means is provided, and a travel trajectory is determined according to the power of the intraocular lens pre-filled by the change means.

[0008] According to the intraocular lens insertion device of the present disclosure, it is possible to provide an intraocular lens insertion device that can suitably insert an intraocular lens into a patient's eye regardless of the power of the intraocular lens to be inserted into the patient's eye. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a plan view of an intraocular lens insertion instrument. [Diagram 2] FIG. 2 is a side view of an intraocular lens insertion device. [Diagram 3] FIG. 2 is a plan view of an intraocular lens. [Figure 4] FIG. 2 is a right side view of the intraocular lens. [Diagram 5] 1 is a cross-sectional view of the optic portion of a low-power intraocular lens. [Figure 6] FIG. 2 is a cross-sectional view of the optic portion of a high-power intraocular lens. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] FIG. 3 is a cross-sectional view taken along line VIII-VIII in FIG. 2. [Figure 9] FIG. 11 is a cross-sectional view showing a schematic diagram of a guide mechanism for low power lenses. [Figure 10] FIG. 13 is a cross-sectional view showing a schematic guide mechanism for altitude. [Figure 11] 1 is a cross-sectional view showing an intraocular lens in a compact folded state. [Figure 12] 1 is a cross-sectional view showing a state in which an intraocular lens is rotated in the circumferential direction of an optical portion by a guide mechanism for low power. [Figure 13] 1 is a cross-sectional view showing the state when the intraocular lens is rotated in the circumferential direction of the optical portion by a guide mechanism for high power. [Figure 14] 11A and 11B are plan and side views showing a schematic view of the movement of the intraocular lens immediately after the intraocular lens is folded and the front support portion is placed on the outer periphery. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] <Summary> The intraocular lens insertion device exemplified in the present disclosure is an intraocular lens insertion device in which one intraocular lens is preloaded from among a plurality of types of intraocular lenses, the thickness of the optical portion of which differs depending on the power. The intraocular lens insertion device includes an insertion device body, a plunger, and a change means. The insertion device body is cylindrical and is preloaded with the intraocular lens. The plunger pushes out the intraocular lens placed inside the cylindrical insertion device body along the extrusion axis. The change means selectively changes the progression trajectory of the plunger moving inside the cylindrical insertion device body. The change means determines the progression trajectory depending on the power of the intraocular lens preloaded.

[0011] The intraocular lens insertion device of the present disclosure includes a change means for selectively changing the trajectory of the plunger moving inside the cylindrical interior of the insertion device body. The change means determines the trajectory of the plunger according to the power of the intraocular lens preloaded. Even for a low-power intraocular lens with a thin optical portion and low rigidity, the plunger's movement trajectory is determined according to the lens rigidity, so that tacking failures and the like can be suppressed and the lens can be folded appropriately. Therefore, it is possible to provide an intraocular lens insertion device that can appropriately insert an intraocular lens into a patient's eye regardless of the power of the intraocular lens to be inserted into the patient's eye.

[0012] The change means in the intraocular lens insertion device may be a mechanism in which a deflection mechanism is disposed on an extrusion axis along which the plunger advances inside the cylindrical interior of the insertion device body, and the trajectory of the plunger's advancement may be changed by changing the deflection angle of the deflection mechanism. Since the trajectory of the plunger's advancement is changed by changing the deflection angle of the deflection mechanism, the amount of deflection can be set finely. This makes it easy to set multiple types of deflection mechanisms, such as for low power bands, medium power bands, and high power bands.

[0013] The change means of the intraocular lens insertion device may change the left-right movement path of the plunger perpendicular to the optical axis of the intraocular lens. This allows the intraocular lens to be folded appropriately while the optical part is rotated in the circumferential direction and the movement path is determined taking into account the lens rigidity according to the power.

[0014] In the intraocular lens insertion device, the intraocular lens has a different radius of curvature of the optical surface depending on the power, the radius of curvature being larger for low power than for high power, and the changing means may have the plunger extrusion position closer to the extrusion axis when the intraocular lens has a low power than for high power. As a result, since the optical part of low power intraocular lenses tends to be thinner and less rigid, unintended deformation of the intraocular lens can be suppressed by moving the plunger extrusion position closer to the extrusion axis. Furthermore, even low power intraocular lenses with a thin optical part and low rigidity can be folded appropriately while suppressing tacking failures.

[0015] In the intraocular lens insertion device, the intraocular lens includes a pair of front and rear support parts extending radially outward from the outer periphery of the optical part, and the insertion device body is provided with a convex part that suppresses the inclination of the optical part when the pre-filled intraocular lens is pushed out by the plunger, and the convex part is disposed on the front side of the optical axis of the optical part, among positions facing the outer periphery of the optical part, on the side where the front support part is not disposed as viewed from the pushing axis, and the convex part protrudes in an arch shape from the bottom surface of the insertion device body toward the ceiling surface and is close to the outer periphery part of the optical part on the rear optical surface side. The convex part can suppress the inclination of the optical part when the intraocular lens is pushed out by the plunger, and can suppress the occurrence of a so-called "rear tacking state" in which the front support part of the intraocular lens is unintentionally tacked.

[0016] First Embodiment Hereinafter, a first embodiment, which is one of typical embodiments of the present disclosure, will be described with reference to the drawings.

[0017] The structure of the injector 1, which is an intraocular lens insertion instrument, will be described. As shown in FIG. 1 and FIG. 2, the injector 1 (intraocular lens insertion instrument) of this embodiment is composed of an insertion instrument body 10, a plunger 12, and the like. The insertion instrument body 10 includes an insertion section 20 and a placement section 22. Such an injector 1 is formed, for example, by injection molding using a resin material (for example, polypropylene) or the like. The injector 1 may also be formed by cutting out a resin. The injector 1 may be a cartridge type in which the insertion section 20 is replaceable. The injector 1 of this embodiment is a so-called preload type, and is shipped in a state in which the intraocular lens 100 is pre-loaded. The injector 1 of this embodiment can be loaded with an intraocular lens of model name MDL, which covers a range of lens powers from 1D to 30D in increments of 0.5D. In other words, the injector 1 of this embodiment is compatible with the range of diopters of the intraocular lenses 100 that can be filled, from 1D to 30D, and the intraocular lenses 100 are available in increments of 0.5D.

[0018] <Intraocular Lens 100> With reference to Figs. 3 and 4, an example of an intraocular lens 100 inserted into the eye by an injector 1 (intraocular lens insertion device) will be described. As shown in Figs. 3 and 4, the intraocular lens 100 used in this embodiment is a one-piece type intraocular lens in which the optical part 110 and a pair of support parts, a front support part 112A and a rear support part 112B, are integrally molded with a flexible material. The intraocular lens 100 can employ various soft resin materials as the flexible material, such as simple substances such as BA (butyl acrylate) and HEMA (hydroxyethyl methacrylate), and composite materials of acrylic acid ester and methacrylic acid ester. Although the so-called one-piece type intraocular lens 100 is exemplified in the first embodiment, at least a part of the technology exemplified in this disclosure can also be applied to a so-called three-piece type intraocular lens in which the optical part 110 and a pair of support parts (the front support part 112A and the rear support part 112B) are formed of separate members.

[0019] The optical part 110 provides a predetermined refractive power to the patient's eye. The optical part 110 is formed in a disk shape. The optical axis L of the optical part 110 passes through the center of the optical part 110 and extends in the up-down direction (thickness direction of the optical part 110). The front support part 112A and the rear support part 112B extend from the outer peripheral part 110a (edge) of the optical part 110 in a curved manner radially outward (outside), and are formed at positions that are point symmetrical with respect to the optical axis L, which is the center of the optical part 110. The front support part 112A has a root part 116A connected to the outer peripheral part 110a of the optical part 110 via the connecting part 114A, and has a loop shape curved in the circumferential direction, and the tip part 118A is open. (That is, the tip part 118A is a free end). The rear support part 112B has a root part 116B connected to the outer peripheral part 110a of the optical part 110 via a connecting part 114B, and has a loop shape curved in the circumferential direction, with a tip part 118B open (i.e., the tip part 118B is a free end). The optical part 110 has, as an end face in the optical axis L direction, a front optical surface 110c facing the ceiling surface 22b of the mounting part 22, and a rear optical surface 110b opposite the front optical surface 110c and facing the bottom surface 22c of the mounting part 22, as described later.

[0020] In the intraocular lens 100 of this embodiment, only the thickness of the optical portion 110 varies depending on the power of the lens, but the contour shape of the optical portion 110 as viewed from the optical axis direction and the shapes of the front support portion 112A and the rear support portion 112B do not change. That is, the radii of curvature of the front optical surface 110c and the rear optical surface 110b, and the thickness of the outer circumferential portion 110a (also called the edge) change depending on the power, and the thickness of the optical portion 110 changes.

[0021] FIG. 5 shows a cross-sectional view of the optical section 110 of an intraocular lens 100 with a diopter of 1D. FIG. 6 shows a cross-sectional view of the optical section 110 of an intraocular lens 100 with a diopter of 30D. Note that FIG. 5 and FIG. 6 are cross-sectional views at the position of the optical axis L. The radius of curvature of the optical surfaces (front optical surface 110c, rear optical surface 110b) in the intraocular lens 100 is relatively larger at the low diopter than at the high diopter. That is, when comparing the intraocular lens 100 with a diopter of 1D and the intraocular lens 100 with a diopter of 30D, the radius of curvature of the front optical surface 110c and the rear optical surface 110b are different. Accordingly, the thickness T1 of the optical section 110 of the 1D intraocular lens 100 is thinner than the thickness T2 of the optical section 110 of the 30D intraocular lens 100.

[0022] <About the insertion device body 10> The insertion instrument body 10 will be described in detail with reference to Figures 7 and 8. The insertion instrument body 10 includes an insertion section 20 and a mounting section 22. The insertion section 20 and the mounting section 22 are formed in a hollow cylindrical shape. A guide mechanism 30 for guiding the forward movement of the plunger 12 is provided on the inner wall of the cylindrical insertion instrument body 10. In the injector 1 of this embodiment, the guide mechanism 30 is detachable from the instrument body, and one guide mechanism 30 can be selected and attached from a plurality of types of guide mechanisms 30 with different shapes.

[0023] As shown in Figures 7 and 8, the insertion section 20 has a passage 20b (front passage). The passage 20b has a space through which the intraocular lens 100 passes narrower toward the tip 20a of the insertion section 20 in order to fold the intraocular lens 100. That is, the passage area gradually decreases toward the tip 20a. The passage area is the cross-sectional area of ​​the passage 20b in a cross section perpendicular to the extrusion direction of the intraocular lens 100 (leftward in Figure 7).

[0024] In addition, a notch (bevel) for sending the intraocular lens 100 to the outside is formed at the tip 20a of the insertion part 20. Then, the intraocular lens 100 that has passed through the passage 20b is folded small along the inner wall surface 20c (front inner wall surface), sent out from the notch at the tip 20a, and inserted into the eye. The inner wall surface 20c (first inner wall surface 24a and second inner wall surface 24b) are formed on both sides in a direction perpendicular to the central axis Lt direction of the passage 20b and parallel to the radial direction of the optical part 110 when the intraocular lens 100 is placed in the passage 20b. The first inner wall surface 24a and the second inner wall surface 24b are formed in a shape (incline) symmetrical with respect to the central axis Lt of the passage 20b.

[0025] The ceiling surface 20d (see FIG. 7) and the bottom surface 20e (see FIG. 8) are formed on both sides in a direction perpendicular to the central axis Lt of the passage 20b and parallel to the central axis (optical axis) L of the optical part 110 when the intraocular lens 100 is placed in the passage 20b. The bottom surface 20e is curved in a concave shape toward the outside of the passage 20b (the back side of the paper in FIG. 8). That is, the bottom surface 20e is a surface facing the first rail 32, the second rail 34, and the deflection part 36 of the guide mechanism 30 described later, and is concave in the protruding direction of the guide mechanism 30.

[0026] 7, 8, etc., assume that the X-axis, Y-axis, and Z-axis are mutually orthogonal, and define the direction parallel to the extrusion direction of the intraocular lens 100 (the direction of the central axis Lt of the passage 20b and the passage 22a, the direction of the extrusion axis Lp) as the X-axis direction. Then, the passage 20b is surrounded by two inner wall surfaces 20c (the first inner wall surface 24a and the second inner wall surface 24b) formed on both sides in the Y-axis direction, and a ceiling surface 20d (see FIG. 7) and a bottom surface 20e (see FIG. 8) formed on both sides in the Z-axis direction. The central axis Lt of the passage 20b coincides with the extrusion axis Lp.

[0027] 7 and 8, the mounting portion 22 is formed at a position rearward of the insertion portion 20 in the pushing direction of the plunger 12 (to the right in Figs. 7 and 8). Then, in a passage 22a (rear passage) formed inside the mounting portion 22, the intraocular lens 100 before being pushed out by the plunger 12 is pre-filled (placed) (see Fig. 8). The mounting portion 22 includes the passage 22a, a ceiling surface 22b, a bottom surface 22c, and the like.

[0028] The guide mechanism 30 (changing means) is a part formed on the ceiling surface 20d and the ceiling surface 22b side, and is a part that guides the pushing direction of the plunger 12. The guide mechanism 30 includes a first rail 32 (first guide protrusion), a second rail 34 (second guide protrusion), a deflection part 36 formed on the tip side of the first rail 32, and the like, as a pair of rail parts extending parallel to the central axis Lt.

[0029] The first rail 32 and the second rail 34 are formed in parallel along the central axis Lt (which is also the extrusion axis Lp in the extrusion direction of the plunger 12). The first rail 32 constitutes one wall surface (upper side in FIG. 7) of the guide mechanism 30, and protrudes from the ceiling surface 20d (see FIG. 7) and the ceiling surface 22b (see FIG. 7) to the bottom surface 20e (see FIG. 8) and the bottom surface 22c (see FIG. 8) (the front side of the paper in FIG. 7). The second rail 34 constitutes the other wall surface (lower side in FIG. 7) of the guide mechanism 30, and protrudes from the ceiling surface 22b (see FIG. 7) to the bottom surface 22c (see FIG. 8) (the front side of the paper in FIG. 7).

[0030] As shown in Fig. 7, in this embodiment, the first rail 32 includes a deflection section 36 (deflection mechanism). The deflection section 36 is formed at a position on the first rail 32 on the tip 20a side of the insertion section 20. The deflection section 36 protrudes from the ceiling surface 20d (see Fig. 7) side toward the bottom surface 20e (see Fig. 8) side in the passage 20b (see Fig. 7) of the insertion section 20. The deflection section 36 also protrudes from the ceiling surface 22b (see Fig. 7) side toward the bottom surface 22c (see Fig. 8) side in the passage 22a (see Fig. 7) of the placement section 22.

[0031] The deflection section 36 has a guide surface 36a formed such that the first rail 32 is inclined toward the second rail 34 side more than the rail surface 32b where the first rail 32 faces the second rail 34. The deflection section 36 is formed in an inclined shape (tapered shape) so that the guide surface 36a is gradually inclined toward the tip 20a side of the insertion section 20. That is, the inclination amount of the guide surface 36a of the deflection section 36 gradually increases toward the tip 20a side of the insertion section 20. Note that the guide surface 36a becomes a surface that deflects and guides the plunger 12, as described later. The deflection section 36 may be formed separately (separately) from the first rail 32. In this embodiment, as shown in FIG. 7, the front end portion 34a of the second rail 34 on the tip 20a side of the insertion section 20 is formed at a position rearward in the extrusion direction of the intraocular lens 100 from the front end portion 32a of the first rail 32 on the tip 20a side of the insertion section 20.

[0032] In this embodiment, the selection and attachment of the guide mechanism 30 are performed in the manufacturing process of the injector 1, and the injector 1 is shipped with the guide mechanism 30 selected in advance in consideration of the power of the intraocular lens 100 to be filled attached to the main body. For example, when the power of the intraocular lens 100 to be filled is 1D or more and 9D or less (referred to as a low power band), the guide mechanism 30A (see FIG. 9) is used, and when the power is more than 9D and 30D or less (referred to as a high power band), the guide mechanism 30B (see FIG. 10) is used. The manufacturing method of the injector 1 may be, for example, a first step of determining the power of the intraocular lens to be filled, a second step of selecting a guide mechanism corresponding to the power determined in the first step from among a plurality of guide mechanisms having different shapes, and a third step of assembling the injector 1 using the intraocular lens with the power determined in the first step and the guide mechanism selected in the second step. In the second step, a worker in the manufacturing process may select the guide mechanism by referring to a table showing the relationship between the combination of the power of the intraocular lens and the type of the guide mechanism. The guide mechanism 30A and the guide mechanism 30B have different shapes of the deflection portion 36. When the plunger 12 moving forward along the central axis Lt comes into contact with the deflection portion 36, the tip of the plunger 12 is deflected in a direction away from the central axis Lt and moves forward. In this embodiment, the guide mechanism 30A and the guide mechanism 30B have different amounts of deflection (i.e., the angle at which the guide surface 36a is inclined with respect to the central axis Lt). That is, the amount of deflection is larger in the guide mechanism 30B than in the guide mechanism 30A.

[0033] As shown in Fig. 8, a convex portion 22f is provided on the bottom surface 22c of the passage 22a formed inside the placement portion 22 to suppress the inclination of the optical portion 110 when the intraocular lens 100 is pushed toward the tip 20a of the insertion portion 20 by the plunger 12 and moves. The convex portion 22f is disposed at a position facing the outer peripheral portion 110a, which is the edge of the optical portion 110 of the intraocular lens 100, at the following location. The convex portion 22f is disposed on the front (tip 20a of the insertion portion 20) side (leftward in Fig. 8) of the optical axis L of the optical portion 110 of the intraocular lens 100, and on the side where the front support portion 112A of the intraocular lens 100 is not disposed as viewed from the central axis Lt (which is also the extrusion axis Lp in the extrusion direction of the plunger 12) (lower side of the central axis Lt in Fig. 8). The convex portion 22f protrudes from the bottom surface 22c toward the ceiling surface 22b in an arched shape and is close to the outer peripheral portion 110a on the rear optical surface 110b side of the optical portion 110. The convex portion 22f is tapered toward the protruding direction and has a rounded fillet processing applied to the tip. This convex portion 22f can suppress the inclination of the optical portion 110 when the intraocular lens 100 is pushed out by the plunger 12, and can suppress the occurrence of a so-called "rear tacking state" in which the front support portion 112A of the intraocular lens 100 is unintentionally tacked toward the rear optical surface 110b side.

[0034] It should be noted that the names "ceiling surface 20d", "bottom surface 20e", "ceiling surface 22b", "bottom surface 22c", etc. are for convenience and do not strictly define the up-down direction of the injector 1. For example, the bottom surface 20e is not always located below the intraocular lens 100. In other words, the up-down direction of the injector 1 may change during transportation, when the injector 1 is filled with a viscoelastic substance, when the intraocular lens 100 is inserted into the eye, etc.

[0035] A method of using the injector 1 (intraocular lens insertion instrument) of this embodiment will be described. In explaining the method of use, the injector 1 will be described as being filled with a low-power intraocular lens 100 and equipped with a guide mechanism 30A. When a user pushes the push-out portion formed at the base end of the plunger 12 to move the entire plunger 12 forward, the intraocular lens 100 with the rear support portion 112B tacked thereto is pushed out along the central axis Lt (which is also the push-out axis Lp in the pushing direction of the plunger 12).

[0036] As shown in FIG. 11, when the plunger 12 is further pushed out, the front support portion 112A also tacks onto the front optical surface 110c of the optical portion 110, and then the entire optical portion 110 is deformed into a roll shape and the intraocular lens 100 is ejected from the insertion port.

[0037] Fig. 12 shows a deformed state of the optical section 110 when the guide mechanism 30A is used. As shown in Fig. 12, when the front support section 112A is tacked onto the optical section 110, the tip 12a (see Figs. 7 and 8) of the plunger 12 comes into contact with the guide surface 36a of the deflection section 36, and the tip 12a of the plunger 12 advances while moving away from the central axis Lt. As the tip 12a of the plunger 12 advances and moves away from the central axis Lt, a circumferential rotation is imparted to the optical section 110, and the tip of the front support section 112A easily reaches the vicinity of the center of the optical section 110 (also see JP 2016-190023 A).

[0038] Here, a comparative injector 1 will be described in which the guide mechanism 30B is attached instead of the guide mechanism 30A. FIG. 13 shows the deformation state of the optical part 110 when the comparative guide mechanism 30B is used. In the comparative injector 1, the deflection amount by the guide mechanism 30A is larger than that by the guide mechanism 30A, so that the deformation of the optical part 110 is likely to be large when the intraocular lens 100 with a low power is pushed out. That is, the lower the power of the intraocular lens 100, the thinner the thickness of the optical part 110 becomes, and the stiffness of the optical part 110 is likely to be low accordingly. Therefore, the further the tip 12a of the plunger 12 is moved from the central axis Lt, the more the part of the optical part 110 with a low stiffness is pushed, and the optical part 110 is likely to be unintentionally deformed significantly.

[0039] Here, the inventors conducted repeated experiments and found a correlation that the low-power intraocular lens 100 is prone to unintended large deformation, while the front support part 112A is easy to tuck because the optical part 110 is thin. Based on this insight, the inventors arrived at a technical idea that allows the front support part 112A to be suitably tucked even if the deflection amount by the guide mechanism 30A is small for the low-power intraocular lens 100.

[0040] In other words, as shown in Fig. 14, even if the tip portion 118A of the front support portion 112A of the high-power intraocular lens 100 is placed on the outer peripheral portion 110a which is the edge of the optical portion 110, the center portion of the optical portion 110 is higher than the center portion of the low-power intraocular lens 100 (see Fig. 5), so the tip portion 118A of the front support portion 112A is unlikely to move from the outer peripheral portion 110a which is the edge to the center portion (see Fig. 6). Therefore, since the tacking of the front support portion 112A is likely to occur shallowly, the tacking property of the front support portion 112A is improved by rotating the optical portion 110 in the circumferential direction. On the other hand, since the central part of the optical part 110 of the low-power intraocular lens 100 is not raised higher (see FIG. 5) than the central part of the high-power intraocular lens 100 (see FIG. 6), when the tip part 118A of the front support part 112A is placed on the outer circumferential part 110a, which is the edge of the optical part 110, the tip part 118A is likely to move from the outer circumferential part 110a to the central part. Therefore, even if the circumferential rotation of the optical part 110 is reduced, the tucking of the front support part 112A is unlikely to become shallow.

[0041] In this way, the injector 1 of this embodiment can suitably tuck the front support part 112A from low power to high power by changing the deflection amount according to the power, focusing on the relationship between the power and the thickness of the optical part 110. Note that this embodiment is an example, and for example, the selectable types of guide mechanism 30 may be set to three types for the low power range, the medium power range, and the high power range, and the deflection angle may be selectable from three types.

[0042] Thus, the injector 1 (intraocular lens insertion device) according to the first embodiment of the present disclosure includes a guide mechanism 30 (changing means) that selectively changes the trajectory of the plunger 12 moving through the cylindrical interior of the insertion device body 10. The trajectory of the plunger 12 is determined according to the power of the intraocular lens 100 pre-loaded by the guide mechanism 30. Even if the intraocular lens 100 has a low power and a thin optical part 110 with low rigidity, the trajectory of the plunger 12 is determined according to the rigidity of the lens, so that tacking failures and the like can be suppressed and the lens can be folded appropriately. Therefore, it is possible to provide an injector 1 (intraocular lens insertion device) that can appropriately insert the intraocular lens 100 into the patient's eye regardless of the power of the intraocular lens 100 to be inserted into the patient's eye.

[0043] In addition, since the trajectory of the plunger 12 changes by changing the deflection angle by the deflection unit 36 ​​(deflection mechanism), the deflection amount can be set finely. This makes it easy to set multiple types of deflection unit 36, such as for low power range, medium power range, and high power range.

[0044] In addition, since the intraocular lens 100 is given a circumferential rotation at its optical portion 110 and the advancement angle is determined taking into account the lens rigidity according to the diopter, tacking problems and the like are suppressed and the lens can be folded suitably.

[0045] In addition, since the optical portion 110 of the low-power intraocular lens 100 tends to be thinner and less rigid, by positioning the extrusion position of the plunger 12 closer to the extrusion axis, it is possible to suppress unintended deformation of the intraocular lens 100. Furthermore, even if the low-power intraocular lens 100 has a thin optical portion 110 with low rigidity, it is possible to suppress tacking failures and the like and to fold it suitably.

[0046] In addition, the convex portion 22f can suppress the tilt of the optical portion 110 when the intraocular lens 100 is pushed out by the plunger 12, thereby suppressing the occurrence of a so-called “reverse tacking state” in which the front support portion 112A of the intraocular lens 100 becomes unintentionally tacked.

[0047] Although the embodiments of the present disclosure have been described above, the intraocular lens insertion device of the present disclosure is not limited to the above-described embodiments and can be embodied in various other forms. [Explanation of symbols]

[0048] 1 Injector (intraocular lens insertion device) 10 Insertion device body 12 Plunger 12a Tip 20 Insertion section 20a tip 20b aisle 20c Inner wall surface 20d Ceiling surface 20e Bottom 24a First inner wall 24b Second inner wall 22 Placement section 22b Ceiling surface 22c bottom 22f Convex 30 Guide mechanism (modification means) 30A Guide mechanism 30B Guide mechanism 32 First rail (first guide protrusion) 32a Front end 32b Rail surface 34 Second rail (second guide protrusion) 34a Front end portion 36 Deflection portion (deflection mechanism) 36a Guide surface 100 Intraocular lens 110 Optical portion 110a Outer peripheral portion 110b Rear optical surface 110c Front optical surface 112A Front support portion 112B Rear support portion 114A Connection portion 116A Base portion 118A Tip portion 114B Connection portion 116B Base portion 118B Tip portion L Optical axis Lp Extrusion axis Lt Central axis

Claims

1. An intraocular lens insertion device in which one intraocular lens is preloaded from among a plurality of types of intraocular lenses whose optical portion only has a different thickness depending on the power, A cylindrical insertion device body in which the intraocular lens is preloaded; A plunger that pushes out the intraocular lens disposed inside the cylindrical portion of the insertion instrument body along a push-out axis; a change means for changing a trajectory of the plunger moving through a cylindrical interior of the insertion instrument body, the change means being selected according to the plurality of types of intraocular lenses, An intraocular lens insertion tool, the moving trajectory of which is determined by the changing means in accordance with the power of the intraocular lens pre-filled.

2. 2. The intraocular lens insertion device according to claim 1, The change means is A deflection mechanism is disposed on an extrusion axis which is a direction in which the plunger advances inside the cylindrical interior of the insertion instrument body, An intraocular lens insertion device in which the moving trajectory changes as the deflection angle by the deflection mechanism changes.

3. The intraocular lens insertion device according to claim 1 or 2, The change means is an intraocular lens insertion device that changes a lateral movement trajectory of the plunger perpendicular to the optical axis of the intraocular lens.

4. The intraocular lens insertion device according to any one of claims 1 to 3, The intraocular lens has a radius of curvature of an optical surface that varies depending on the power, and the radius of curvature is larger for low power than for high power, The change means is an intraocular lens insertion device in which the pushing position of the plunger is closer to the pushing axis when the power of the intraocular lens is lower than that of the high power.

5. The intraocular lens insertion device according to any one of claims 1 to 4, The intraocular lens includes a pair of front support portions and a rear support portion extending radially outward from an outer circumferential portion of the optical portion, The insertion instrument body is provided with a convex portion that suppresses the inclination of the optical portion when the pre-loaded intraocular lens is pushed out by the plunger, the convex portion is disposed on a side of the optical axis of the optical portion, which is located forward of the optical axis of the optical portion and on a side where the front support portion is not disposed as viewed from the extrusion shaft, among positions facing an outer circumferential portion of the optical portion, The convex portion protrudes in an arched shape from a bottom surface of the insertion device body toward a ceiling surface and is close to an outer circumferential portion of the optical portion on the side of the posterior optical surface.

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