Intraocular lens insertion instrument

Abstract

To improve operability in an intraocular lens insertion instrument that can be used both by a rotation operation method and a pressure operation method.SOLUTION: An intraocular lens insertion instrument includes a cylindrical body 12, an extrusion member 50 for extruding an intraocular lens from a lens installation part 26 by moving the inside of the cylindrical body 12 in an axial direction, a pressing member 60 configured to be separated from the extrusion member 50 for moving the extrusion member 50 in an axial direction by pressing the rear end of the extrusion member 50 along the axial direction, and a mechanical transmission mechanism for converting the drive by rotation operation of a rotation member 70 into a linear movement. The intraocular lens can be extruded by moving the extrusion member 50 forward independently of the pressing member 60 by the rotation operation R of the rotation member 70 in the mechanical transmission mechanism.SELECTED DRAWING: Figure 2

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, for example, the technology of Patent Document 1 is known. The intraocular lens insertion device described in Patent Document 1 is compatible with both the so-called rotation operation method and the pushing operation method. In the case of the rotation operation method, a plunger that meshes with the rotation member by a screw is moved in the axial direction of the inserter body by rotating a rotation member connected to the rear end of the inserter body. In the case of the pushing operation method, the rotation member is rotated by pushing the plunger, and the plunger moves forward in the axial direction of the inserter body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2018 / 003854 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology disclosed in Patent Document 1 has concerns about operability in that touching the plunger during operation of the rotating member creates resistance to the rotational movement when using the rotational operation method. Therefore, further improvements to address operability concerns have been desired in an intraocular lens insertion device that can be used with both the rotational operation method and the pressing operation method.

[0006] Therefore, the present disclosure has been made to solve the above-mentioned problems, and aims to improve the operability of an intraocular lens insertion device that is compatible with both rotational operation methods and pressing operation methods. [Means for solving the problem]

[0007] An intraocular lens insertion device provided by a typical embodiment of the present disclosure includes a cylindrical body having a lens mounting section in which an intraocular lens is mounted, a pusher member that pushes the intraocular lens out of the lens mounting section by moving inside the cylindrical body in the axial direction of the cylindrical body, a pressing member that is separate from the pusher member and presses the rear end of the pusher member along the axial direction, thereby enabling axial movement of the pusher member, and a mechanical transmission mechanism that converts drive generated by rotational operation of a rotating member into linear movement, and an intraocular lens insertion device that is capable of pushing out the intraocular lens by moving the pusher member forward independently of the pressing member by rotating the rotating member in the mechanical transmission mechanism.

[0008] According to the intraocular lens insertion device of the present disclosure, it is possible to improve operability in an intraocular lens insertion device that is compatible with both a rotation operation method and a pressure operation method. [Brief description of the drawings]

[0009] [Figure 1] 1 is an overall perspective view showing an intraocular lens insertion instrument according to a first embodiment. [Diagram 2] FIG. 1 is an exploded perspective view showing an intraocular lens insertion instrument according to a first embodiment. [Diagram 3] FIG. 1 is a plan view of an intraocular lens according to a first embodiment. [Figure 4] FIG. 2 is a right side view of the intraocular lens according to the first embodiment. [Diagram 5] FIG. 2 is a plan view showing the intraocular lens insertion instrument according to the first embodiment before operation. [Figure 6] 4 is a plan view showing the movement of a push-out member and a pressing member during a rotation operation of the intraocular lens insertion device in the first embodiment. FIG. [Figure 7] 4 is a plan view showing the movement of a push-out member and a push-pressing member during a pushing operation of the intraocular lens insertion device in the first embodiment. FIG. [Figure 8] FIG. 11 is an exploded perspective view showing an intraocular lens insertion instrument according to a second embodiment. [Figure 9] FIG. 11 is a plan view showing an intraocular lens insertion instrument according to the second embodiment before operation. [Figure 10] 13 is a plan view showing the movement of a push-out member and a press-down member during a rotation operation of the intraocular lens insertion device in the second embodiment. FIG. [Figure 11] 13 is a plan view showing the movement of a push-out member and a push-up member during a pushing operation of the intraocular lens insertion device of the second embodiment. FIG. [Figure 12] FIG. 11 is an exploded perspective view showing an intraocular lens insertion instrument according to a third embodiment. [Figure 13] 13 is a side view showing a state during a pressing operation of the intraocular lens insertion device in embodiment 3. FIG. [Figure 14] 13 is a side view showing a state during a rotation operation of the intraocular lens insertion device in embodiment 3. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] <Overview> The intraocular lens insertion device exemplified in the present disclosure includes a cylindrical body, a pusher member, a pressing member, and a mechanical transmission mechanism. The cylindrical body has a lens installation section in which an intraocular lens is installed. The pusher member pushes out the intraocular lens from the lens installation section by moving inside the cylindrical body in the axial direction of the cylindrical body. The pressing member is configured to be a separate pusher member, and enables the axial movement of the pusher member by pressing the rear end of the pusher member along the axial direction. The mechanical transmission mechanism converts the drive by the rotation operation of the rotating member into linear movement. Then, by the rotation operation of the rotating member in the mechanical transmission mechanism, the pusher member can be moved forward independently of the pressing member, thereby pushing out the intraocular lens. As a result, since the pusher member and the pressing member are configured to be separate, the pressing member does not move in conjunction with the rotation operation by the rotating member, and even if it touches the pressing member, it does not become a resistance to the rotation operation, so that the operability can be improved. As described above, the operability can be improved in an intraocular lens insertion device that can be used for both the rotation operation method and the pressing operation method.

[0011] The mechanical transmission mechanism may be configured such that the rotating member is formed with a first screw portion and is attached to the cylindrical body so as to be rotatable around the axis of the cylindrical body, and the pushing member is formed with a second screw portion that screws with the first screw portion, and the drive generated by the rotation of the rotating member is converted into linear movement. This allows the pushing member to be reliably moved by the screw configuration of the rotating member and the pushing member, and can favorably improve operability.

[0012] The rotating member may be disposed on the distal side of a flange portion that protrudes from the outer surface of the cylindrical body and hooks the user's fingers, and the extrusion member may be entirely housed inside the cylindrical body with the second screw portion meshed with the first screw portion. By disposing the rotating member on the distal side of the flange portion, the rotating member is closer to the distal end, which suppresses the shaking of the rotating operation by the rotating member and improves operability. In addition, since the extrusion member is difficult to touch directly, it is possible to further prevent mutual interference in operation.

[0013] In addition, the mechanical transmission mechanism may have an idling release mechanism that prevents the rotating member in the mechanical transmission mechanism from idling due to the operating force of the pressing operation of the pressing member. This prevents the rotating member in the mechanical transmission mechanism from idling due to the operating force of the pressing operation of the pressing member, so that even if the rotating member is touched, it does not become a resistance to the pressing operation, thereby further improving operability.

[0014] <Embodiment 1> Hereinafter, a first embodiment, which is one of typical embodiments of the present disclosure, will be described with reference to FIGS. 1 to 7. FIG.

[0015] In the following description, the directions shown in each drawing are described as the direction toward the tip of the nozzle 34 side of the main body 12 of the intraocular lens insertion instrument 10 (the lower left side of the drawing in Figs. 1 and 2) as the front of the intraocular lens insertion instrument 10, and the direction toward the pressing member 60 (the upper right side of the drawing in Figs. 1 and 2) as the rear of the intraocular lens insertion instrument 10. In addition, the upper side of the drawing in Figs. 1 and 2 is described as the upper side of the intraocular lens insertion instrument 10, the lower side of the drawing in Figs. 1 and 2 is described as the lower side of the intraocular lens insertion instrument 10, the lower right side of the drawing in Figs. 1 and 2 is described as the left side of the intraocular lens insertion instrument 10, and the upper left side of the drawing in Figs. 1 and 2 is described as the right side of the intraocular lens insertion instrument 10.

[0016] <Overall Configuration of Intraocular Lens Insertion Instrument 10> Referring to FIGS. 1 and 2, the overall configuration of the intraocular lens insertion instrument 10 according to Embodiment 1 will be described. The intraocular lens insertion instrument 10 is used to insert a deformable intraocular lens 1 (see FIGS. 3 and 4, details will be described later) into the eye. The intraocular lens insertion instrument 10 includes a main body portion 12 (cylindrical body), an extrusion member 50, a pressing member 60, and a mechanical transmission mechanism. The main body portion 12 is substantially cylindrical, and the intraocular lens 1 is inserted into the eye through a passage inside the main body portion 12. The main body portion 12 has a lens installation portion 26 where the intraocular lens 1 is installed. The extrusion member 50 has a rod-shaped portion and moves forward (in the direction along the extrusion axis A, in other words, in the axial direction of the main body portion 12) along the extrusion axis A in the passage inside the main body portion 12, thereby being a member that extrudes the intraocular lens 1 filled in the lens installation portion 26. The pressing member 60 is a member that enables the axial movement of the extrusion member 50 by pressing the extrusion member 50 in the direction along the extrusion axis A. The mechanical transmission mechanism has a spiral groove 78 (first screw portion) formed in a rotating member 70 and is rotatably attached around the axis of the main body portion 12. A screw shaft 58 (second screw portion) that engages with the spiral groove 78 (first screw portion) is formed on the extrusion member 50. Thus, the extrusion member 50 is configured to be converted into linear movement by driving by the rotation operation R of the rotating member 70.

[0017] The intraocular lens insertion device 10 can realize both a first operation and a second operation. The first operation is an operation in which the pushing member 50 is moved forward by a rotation operation R of the rotating member 70 in the mechanical transmission mechanism, thereby making it possible to push out the intraocular lens 1. This is a so-called rotation operation method. The second operation is an operation in which the rotating member 70 in the mechanical transmission mechanism is rotated idly to move the pushing member 50 forward by a pressing operation P of the pressing member 60, thereby making it possible to push out the intraocular lens 1. This is a so-called pressing operation method. In addition, the pushing member 50 and the pressing member 60 are configured to be separated, and in the first operation, the pushing member 50 is moved forward independently of the pressing member 60 by the driving force of the mechanical transmission mechanism. Here, the rotating member 70 in the mechanical transmission mechanism is disposed on the tip side of the flange portion 16 that protrudes from the outer surface of the main body portion 12 and is used to hook the fingers of the user's hand. Specifically, the rotating member 70 is disposed between the lens mounting portion 26 and the flange portion 16, at a position spaced apart from the flange portion 16. In other words, the rotating member 70 and the pressing member 60 are disposed at positions spaced apart from each other.

[0018] The main body 12 (cylindrical body), the extrusion member 50, the pressing member 60, and the mechanical transmission mechanism in the intraocular lens insertion instrument 10 of the present embodiment 1 are formed by injection molding using a resin material (e.g., polypropylene) or the like. The intraocular lens insertion instrument 10 may be formed by cutting work such as scraping out a resin. The intraocular lens insertion instrument 10 may be of a cartridge type in which the nozzle 34 is replaceable. Since the intraocular lens insertion instrument 10 is formed of a resin material, the user can easily dispose of the intraocular lens insertion instrument 10 after use. Note that the intraocular lens insertion instrument 10 of the present embodiment 1 is a so-called preload type, and illustrates an example in which the intraocular lens 1 is shipped in a preloaded state.

[0019] In the present embodiment 1, a lubricating coating is applied to the inner wall of the main body 12 in order to smoothly insert the adhesive soft intraocular lens 1 into the eye. The intraocular lens insertion device 10 of the present embodiment 1 is formed to be colorless transparent or colorless translucent. Therefore, the user can easily visually check the deformation state of the intraocular lens 1 filled inside the intraocular lens insertion device 10 from the outside of the intraocular lens insertion device 10.

[0020] <Main body 12 (cylindrical body)> The main body 12 will be described with reference to Figures 1 and 2. The main body 12 includes, from the rear to the front, a main body tube portion 14, a lens installation portion 26, and a nozzle 34.

[0021] The main body tube portion 14 is formed in a cylindrical shape extending in the front-rear direction. The main body tube portion 14 is located on the rear end side of the main body portion 12. A flange portion 16 that protrudes outward from the outer circumferential surface is provided at the rear end position in the longitudinal direction of the main body tube portion 14. When in use, a user holds the flange portion 16 by hooking their fingers. The inner surface of the main body tube portion 14 is formed in a cross-sectional shape that guides the shaft portion 62 of the pressing member 60 described later, and is configured in a cylindrical shape along the extrusion axis A.

[0022] A rotation guide section 18 is formed on the front side of the main body tube section 14. The rotation guide section 18 is configured in a cylindrical shape with a diameter smaller than that of the main body tube section 14. In this embodiment, the outer surface of the rotation guide section 18 is configured with an arc surface 18a that guides the inner circumferential surface of the rotating member 70 described later, and an upper horizontal surface 20 and a lower horizontal surface 22 that are parallel to each other and are cut out in a horizontal plane. An upper slit 20a that opens in a continuous manner in the front-rear direction is formed on the upper horizontal surface 20. Similarly, a lower slit 22a that opens in a continuous manner in the front-rear direction is formed on the lower horizontal surface 22. In this embodiment, the inner surface of the rotation guide section 18 is formed in a substantially rectangular cross-sectional shape that guides a guide block 54 (mechanical transmission mechanism) described later, and is configured in a cylindrical shape along the extrusion axis A. A tip tube section 24 is configured on the front side of the rotation guide section 18. A fitting hole that connects the connecting section 32 of the lens installation section 26 is formed on the front end surface of the tip tube section 24.

[0023] The lens setting section 26 is connected to the front end side of the tip tube portion 24. The lens setting section 26 is configured to have a cylindrical interior and is equipped with a setting section main body 30, a top plate portion 28, etc. The setting section main body 30 is a box-shaped member with an open top. The intraocular lens 1 before being pushed out by the pushing member 50 is set (loaded) inside the setting section main body 30 in the lens setting section 26. A connecting portion 32 that connects to the tip tube portion 24 is configured on the rear end side of the setting section main body 30.

[0024] The top plate portion 28 is disposed across the nozzle 34 and the installation unit main body 30, and is a lid member that covers the upper openings thereof. The top plate portion 28 may be formed by injection molding using a resin material (e.g., polypropylene), cutting processing by scraping out resin, or the like. The top plate portion 28 is flat and is formed so as to cover the openings of the nozzle 34 and the installation unit main body 30. The top plate portion 28 is provided with a groove-shaped guide portion (not shown) that guides the extrusion member 50 along the extrusion direction (extrusion axis A).

[0025] The nozzle 34 is connected to the front end side of the lens installation section 26. The nozzle 34 has an insertion section 36 and a tapered section 44. The internal passage area of ​​the tapered section 44 becomes smaller toward the front in order to deform the intraocular lens 1 small in the process of pushing the intraocular lens 1 forward. In other words, the tapered section 44 has a hollow passage shape (inner cavity shape) in which the passage through which the intraocular lens 1 passes becomes narrower toward the tip.

[0026] The insertion section 36 is connected to the front end of the nozzle 34. The insertion section 36 is a portion to be inserted (inserted, pierced) into the eye. The insertion section 36 is formed in a cylindrical shape. The inner surface of the insertion section 36 has a substantially circular cross section, and the central axis and the extrusion axis A coincide with each other. The open end face at the tip of the insertion section 36 is formed with an inclined open end face 38 (bevel) that opens to eject the intraocular lens 1 forward from the internal passage. The inclined open end face 38 is formed in a notch shape with the tip cut obliquely at an angle with respect to a virtual plane perpendicular to the central axis (extrusion axis A) of the insertion section 36. The internal passage of the main body section 12 penetrates from the rear end of the main body tube section 14 to the inclined open end face 38 at the front end of the nozzle 34. The insertion section 36 has an open tip portion 40 located at the forefront of the inclined open end face 38. The insertion section 36 also has a slit 42 cut from the end face located at the rear end of the inclined open end face 38 toward the rear in the axial direction.

[0027] <Extrusion member 50> The pushing member 50 is a member that pushes out the intraocular lens 1 from the lens mounting portion 26 by moving inside the main body portion 12 (cylindrical body) along the axial direction (pushing axis A) of the main body portion 12. The pushing member 50 has a rod-shaped portion 52, a guide block 54 (mechanical transmission mechanism), and a screw shaft 58 (second screw portion, mechanical transmission mechanism). The rod-shaped portion 52 is a rod-shaped member that extends along the pushing axis A. The rod-shaped portion 52 is formed so that the shape of a cross section perpendicular to the pushing axis A is approximately circular. The rod-shaped portion 52 has a thickness that allows it to pass through the insertion portion 36 and the inclined opening end surface 38 of the main body portion 12. The rod-shaped portion 52 of the pushing member 50 moves forward along the pushing axis A inside the passage of the main body portion 12 to tack the intraocular lens 1 and to eject the intraocular lens 1 from the inclined opening end surface 38 into the eye.

[0028] The guide block 54 is integrally connected to the rod-shaped portion 52 at the rear end of the rod-shaped portion 52. The guide block 54 has a substantially rectangular parallelepiped shape. A shaft-shaped screw shaft 58 protrudes from the upper and lower surfaces of the guide block 54. The protruding amounts of the screw shafts 58 have the following relationship. The screw shaft 58 on the upper slit 20a side protrudes upward from the upper slit 20a and protrudes to a position where it screws into a spiral groove 78 (first screw portion) of a rotating member 70, which will be described later. The screw shaft 58 on the lower slit 22a side protrudes downward from the lower slit 22a and protrudes to a position where it screws into a spiral groove 78 (first screw portion) of a rotating member 70, which will be described later.

[0029] <Pressing member 60> The pressing member 60 allows the extrusion member 50 to move in the axial direction by pressing the extrusion member 50 along the extrusion axis A. The pressing member 60 is located rearward of the extrusion member 50 on the extrusion axis A and is configured separately from the extrusion member 50. A plate-shaped pressing operation part 64 extending in a direction perpendicular to the extrusion axis A (see FIG. 1) is formed at the rear end of the pressing member 60. The pressing operation part 64 is a part that is contacted by the user's finger when the user pushes it forward. A shaft part 62 extending along the extrusion axis A is formed in front of the pressing operation part 64. A tip surface 62a of the shaft part 62 is a part that contacts the rear end surface 56 of the guide block 54 and pushes it forward along the extrusion axis A. A slit 66 is provided at the tip of the shaft part 62 along the extrusion axis A. A claw part 68 is provided at the tip surface 62a of the shaft part 62. The tip surface 62a of the shaft portion 62 can pass forward along the extrusion axis A along the inner surface of the main body tube portion 14 by moving the claw portions 68 radially inward due to the elastic deformation of the slits 66. When the tip surface 62a of the shaft portion 62 reaches the inner surface of the rotation guide portion 18, the claw portions 68 move radially outward due to the elastic deformation of the slits 66 and engage with a step between the inner surface of the main body tube portion 14 and the inner surface of the rotation guide portion 18. The position where the claw portions 68 engage with the pressing member 60 is the initial position before the pressing operation P is performed. Furthermore, the engagement of the claw portions 68 prevents the pressing member 60 from slipping out rearward from the initial position.

[0030] <Mechanical transmission mechanism> The mechanical transmission mechanism is a mechanism that transmits the drive generated by the rotation operation R of the rotating member 70 to the guide block 54 and converts the extrusion member 50 into a linear movement. The mechanical transmission mechanism has the rotating member 70, a spiral groove 78 (first screw portion), the guide block 54, and a screw shaft 58 (second screw portion). The rotating member 70 is a cylindrical member formed by connecting two half-split bodies. A spiral groove 78 (first screw portion) is formed on the inner peripheral surface of the rotating member 70. The two half-split bodies of the rotating member 70 are attached so as to be rotatable in the direction around the axis of the rotation guide part 18 by the engagement of the engaging part 74 and the engaged part 76. The outer surface of the rotating member 70 is formed with a concave-convex groove 72 that alternates between concave and convex. The concave-convex groove 72 allows the user's fingers to hook the rotating member 70 and rotate it easily. The mechanical transmission mechanism is attached to the rotating member 70 so as to be rotatable about the axis of the main body 12, with a spiral groove 78 (first screw portion) formed in the rotating member 70. The pushing member 50 is configured with a screw shaft 58 (second screw portion) that screws into the spiral groove 78 (first screw portion). This transmits the drive generated by the rotation operation R of the rotating member 70 to the guide block 54, thereby moving the pushing member 50 along the pushing axis A.

[0031] <Intraocular lens 1> An example of an intraocular lens 1 inserted into the eye by an intraocular lens insertion device 10 will be described with reference to Figs. 3 and 4. The intraocular lens 1 includes an optical part 2 and a support part 3. The intraocular lens 1 of the present embodiment 1 is a so-called one-piece type intraocular lens in which the optical part 2 and the support part 3 are integrally molded. The intraocular lens 1 used in the present embodiment 1 is integrally molded with the optical part 2 and a pair of support parts 3, that is, a front support part 3A and a rear support part 3B. The intraocular lens 1 can employ various soft resin materials as the soft 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 1 is exemplified in the present embodiment 1, at least a part of the technology exemplified in the present disclosure can also be applied to a so-called three-piece type intraocular lens in which the optical part 2 and the support part 3 are formed of separate members.

[0032] The optical part 2 provides a predetermined refractive power to the patient's eye. The optical part 2 is disc-shaped. The optical axis L of the optical part 2 passes through the center of the optical part 2 and extends in the vertical direction. The optical part 2 has a first surface 2A that contacts the top plate part 28 of the lens installation part 26 as described later, and a second surface 2B formed on the opposite side of the first surface 2A, as end faces in the optical axis L direction. The support part 3 supports the optical part 2 inside the eye. As an example, the intraocular lens 1 of the present embodiment 1 is provided with a front support part 3A and a rear support part 3B as a pair of support parts 3. In addition, the front support part 3A and the rear support part 3B are curved and extended radially outward from the outer peripheral edge part 2C of the optical part 2, and are formed at positions that are point symmetrical with respect to the optical axis L, which is the center of the optical part 2. The front support part 3A has a root part 6A connected to the outer peripheral edge part 2C of the optical part 2 via a connecting part 4A, has a loop shape curved in the circumferential direction, and has an open tip part 8A. (That is, the tip part 8A is a free end). The rear support part 3B has a root part 6B connected to the outer peripheral edge part 2C of the optical part 2 via a connecting part 4B, has a loop shape curved in the circumferential direction, and has an open tip part 8B (That is, the tip part 8B is a free end). The front support part 3A is located on the inclined opening end face 38 side from the optical part 2 in the main body part 12. The rear support part 3B is located on the rear side (the side away from the inclined opening end face 38) from the optical part 2 in the main body part 12. The outer peripheral edge part 2C is also called "edge".

[0033] 5 to 7, the operation when the first embodiment exemplified in the present disclosure is adopted will be described. The intraocular lens insertion device 10 is capable of implementing both a first operation and a second operation. Note that when describing the first operation and the second operation, illustration of the intraocular lens 1 held in the lens setting section 26 will be omitted.

[0034] <First operation (rotation operation method) Fig. 5, 6> The first operation is an operation in which the push-out member 50 is moved forward by a rotation operation R of the rotating member 70 in the mechanical transmission mechanism, thereby making it possible to push out the intraocular lens 1. This is a so-called rotation operation method.

[0035] FIG. 5 shows a state before the rotation operation R, which is the first operation, is performed. The screw shaft 58 (second screw portion) is held in a state where it is screwed into the spiral groove 78 (first screw portion) of the rotating member 70 at a rear position. The pressing member 60 is held in an initial position. When the rotation operation R of the rotating member 70 is performed as shown in FIG. 6, the screw shaft 58 (second screw portion) screwed into the spiral groove 78 (first screw portion) moves forward along the groove of the spiral groove 78. As a result, the drive by the rotation operation R of the rotating member 70 is transmitted to the guide block 54, and the extrusion member 50 is moved along the extrusion axis A. At this time, the extrusion member 50 is moved forward independently of the pressing member 60 by the driving force of the mechanical transmission mechanism during the first operation (the pressing member 60 does not move). As a result, since the extrusion member 50 and the pressing member 60 are separate, the pressing member 60 does not move in conjunction with the rotation operation R by the rotating member 70. Even if the pressing member 60 is touched, it does not provide resistance to the rotation operation, thereby improving operability.

[0036] <Second operation (pressing operation method) Fig. 5, 7> The second operation is an operation in which the pressing operation P of the pressing member 60 causes the rotating member 70 in the mechanical transmission mechanism to rotate idly, thereby moving the push-out member 50 forward, thereby making it possible to push out the intraocular lens 1. This is a so-called pressing operation method. In addition, in this disclosure, "idling" refers to a state in which the rotating member 70 itself rotates in a state in which no operating force of the rotation operation R is applied to the rotating member 70.

[0037] FIG. 5 shows the state before the pressing operation P which is the second operation. The screw shaft 58 (second screw portion) is held in a screwed state at a rearward position of the spiral groove 78 (first screw portion) of the rotating member 70. The pressing member 60 is held at the initial position. When the pressing operation P of the pressing member 60 is performed as shown in FIG. 7, the front end surface 62a of the pressing member 60 abuts against the rear end surface 56 of the guide block 54 and is further pressed forward. Then, the guide block 54 is pressed by the pressing member 60, and the screw shaft 58 (second screw portion) is pushed forward along the groove of the spiral groove 78. As a result, the extrusion member 50 moves forward while the rotating member 70 idles, enabling the intraocular lens 1 to be extruded. Thus, by the pressing operation P of the pressing member 60, the extrusion member 50 is moved along the extrusion axis A.

[0038] ≪Embodiment 2≫ Hereinafter, Embodiment 2 which is one of the typical embodiments in the present disclosure will be described with reference to FIGS. 8 to 11.

[0039] In Embodiment 2, there is an idle rotation prevention mechanism that does not idle the rotating member 70 in the mechanical transmission mechanism by the operating force of the pressing operation P of the pressing member 60. As a result, in the second operation (pressing operation method), even when the operating force of the pressing operation P of the pressing member 60 is applied, the extrusion member 50 can be moved forward to extrude the intraocular lens 1 without idling the rotating member 70. Here, in the description of Embodiment 2, the configurations different from those in Embodiment 1 will be described in detail, and the configurations substantially the same as those in Embodiment 1 will be denoted by the same reference numerals as in Embodiment 1, and the detailed description will be omitted.

[0040] <Overall Configuration of Intraocular Lens Insertion Instrument 200> The overall configuration of an intraocular lens insertion instrument 200 of the second embodiment will be described with reference to Fig. 8. The intraocular lens insertion instrument 200 is used to insert a deformable intraocular lens 1 (see Figs. 3 and 4, details will be described later) into the eye. The intraocular lens insertion instrument 200 includes a main body 12 (cylindrical body), a pushing member 250, a pressing member 260, and a mechanical transmission mechanism. Note that the main body 12 (cylindrical body) in the second embodiment has substantially the same configuration as in the first embodiment, and therefore is denoted by the same reference numerals as in the first embodiment, and detailed description thereof will be omitted.

[0041] <Extrusion member 250> The pushing member 250 is a member that moves inside the main body portion 12 (cylindrical body) along the axial direction (pushing axis A) of the main body portion 12, thereby pushing out the intraocular lens 1 from the lens installation portion 26. The pushing member 250 has a rod-shaped portion 252, a first guide block 254a, a second guide block 254b (mechanical transmission mechanism), and a screw shaft 258 (second screw portion, mechanical transmission mechanism).

[0042] The rod-shaped portion 252 is a rod-shaped member extending along the extrusion axis A. The rod-shaped portion 252 is formed so that the cross section perpendicular to the extrusion axis A has a substantially circular shape. The rod-shaped portion 252 has a thickness such that it can pass through the insertion portion 36 and the inclined opening end surface 38 of the main body portion 12. The rod-shaped portion 252 of the pushing member 250 moves forward along the extrusion axis A within the passage of the main body portion 12, thereby tacking the intraocular lens 1 and expelling the intraocular lens 1 from the inclined opening end surface 38 into the eye.

[0043] The mechanical transmission mechanism includes a first guide block 254a and a second guide block 254b. The first guide block 254a and the second guide block 254b are separate. The first guide block 254a is disposed on the front side along the extrusion axis A. The second guide block 254b is disposed on the rear side along the extrusion axis A.

[0044] The first guide block 254a is integrally connected to the rod-shaped portion 252 at the rear end of the rod-shaped portion 252. The first guide block 254a and the second guide block 254b both have a substantially rectangular parallelepiped shape.

[0045] The second guide block 254b is formed with a through hole 257 penetrating along the extrusion axis A. The inner diameter of the through hole 257 is configured to a diameter that allows the second shaft portion 263 of the pressing member 260 to pass through. A shaft-shaped screw shaft 258 protrudes from the upper and lower surfaces of the second guide block 254b. The protruding amount of the screw shaft 258 has the following relationship. The screw shaft 258 on the upper slit 20a side protrudes upward from the upper slit 20a and protrudes to a position where it screws into a spiral groove 78 (first screw portion) of the rotating member 70 described later. The screw shaft 258 on the lower slit 22a side protrudes downward from the lower slit 22a and protrudes to a position where it screws into a spiral groove 78 (first screw portion) of the rotating member 70 described later.

[0046] <Pressing member 260> The pressing member 260 allows the extrusion member 250 to move in the axial direction by pressing the extrusion member 250 along the extrusion axis A. The pressing member 260 is located rearward of the extrusion member 250 on the extrusion axis A and is configured separately from the extrusion member 250. A plate-shaped pressing operation part 264 extending in a direction perpendicular to the extrusion axis A (see FIG. 1) is formed at the rear end of the pressing member 260. The pressing operation part 264 is a part that is contacted by the user's finger when the user pushes it forward. A first shaft part 262 extending along the extrusion axis A is formed in front of the pressing operation part 264. A second shaft part 263 extending along the extrusion axis A is formed in front of the first shaft part 262. The second shaft part 263 is thinner than the first shaft part 262 and is formed with a thickness that can pass through the through hole 257 of the second guide block 254b. A tip end surface 266 of the second shaft portion 263 is a portion that comes into contact with a rear end surface 256 of the first guide block 254a and pushes it forward along the pushing axis A. The position of the pressing member 260 immediately before the second shaft portion 263 enters the through hole 257 is the initial position before the pressing operation P is performed.

[0047] 9 to 11, the operation when the second embodiment exemplified in the present disclosure is adopted will be described. The intraocular lens insertion device 200 is capable of implementing both the first operation and the second operation. Note that when describing the first operation and the second operation, illustration of the intraocular lens 1 held in the lens setting section 26 will be omitted.

[0048] <First operation (rotation operation method) Fig. 9, 10> The first operation is an operation in which the pushing member 250 is moved forward by a rotation operation R of the rotating member 70 in the mechanical transmission mechanism, thereby making it possible to push out the intraocular lens 1. This is a so-called rotation operation method.

[0049] FIG. 9 shows a state before the rotation operation R, which is the first operation, is performed. The screw shaft 258 (second screw portion) is held in a state where it is screwed into the spiral groove 78 (first screw portion) of the rotating member 70 at a rear position. The pressing member 260 is held in an initial position. When the rotation operation R of the rotating member 70 is performed as shown in FIG. 10, the screw shaft 258 (second screw portion) screwed into the spiral groove 78 (first screw portion) moves forward along the groove of the spiral groove 78. As a result, the drive by the rotation operation R of the rotating member 70 is transmitted to the second guide block 254b, and the extrusion member 250 moves forward along the extrusion axis A. Then, the first guide block 254a is pushed by the forward movement of the second guide block 254b and moves forward along the extrusion axis A. At this time, during the first operation, the push-out member 250 is moved forward by the driving force of the mechanical transmission mechanism independently of the pressing member 260 (the pressing member 260 does not move). As a result, since the push-out member 250 and the pressing member 260 are configured separately, the pressing member 260 does not move in conjunction with the rotation operation R by the rotating member 70, and even if the pressing member 260 is touched, it does not resist the rotation operation, which can improve operability.

[0050] <Second operation (pressing operation method) Fig. 9, 11> The second operation is an operation in which the pressing operation P of the pressing member 260 causes the rotating member 70 in the mechanical transmission mechanism to rotate idly, thereby moving the pushing member 250 forward, thereby making it possible to push out the intraocular lens 1. This is a so-called pressing operation method.

[0051] FIG. 9 shows a state before the pressing operation P, which is the second operation, is performed. The screw shaft 258 (second screw portion) is held in a state where it is screwed into the spiral groove 78 (first screw portion) of the rotating member 70 at a rear position. The pressing member 260 is held in an initial position. When the pressing operation P of the pressing member 260 is performed as shown in FIG. 11, the tip surface 266 of the pressing member 260 passes through the through hole 257 of the second guide block 254b, abuts against the rear end surface 256 of the first guide block 254a, and is pressed further forward. Then, the first guide block 254a moves forward by the pressing of the pressing member 260, leaving the second guide block 254b behind (while remaining in a position where it is screwed into the spiral groove 78 (first screw portion) of the rotating member 70 at a rear position), and the rod-shaped portion 252 integral with the first guide block 254a can push out the intraocular lens 1. As a result, the pushing member 250 is moved along the pushing axis A by the pushing operation P of the pressing member 260. At this time, the rotating member 70 does not rotate idly because the second guide block 254b does not move and remains in a position where it is screwed into the spiral groove 78 (first screw portion) of the rotating member 70 at a rear position. That is, the through hole 257 of the second guide block 254b and the second shaft portion 263 of the pressing member 260 function as an "idling release mechanism" that does not allow the operating force of the pushing operation P of the pressing member 60 to cause the rotating member 70 in the mechanical transmission mechanism to rotate idly.

[0052] Third Embodiment Hereinafter, a third embodiment, which is one of typical embodiments of the present disclosure, will be described with reference to Fig. 12. The third embodiment will be described in a form different from the idling release mechanism of the second embodiment. Also, in the description of the third embodiment, configurations different from the first and second embodiments will be described in detail, and configurations substantially similar to the first and second embodiments will be denoted by the same reference numerals as the first and second embodiments, and detailed description thereof will be omitted.

[0053] <Overall configuration of intraocular lens insertion device 300> The overall configuration of the intraocular lens insertion instrument 300 of the second embodiment will be described with reference to FIG. 12. The intraocular lens insertion instrument 300 is used to insert a deformable intraocular lens 1 (see FIGS. 3 and 4, details of which will be described later) into the eye. The intraocular lens insertion instrument 300 includes a main body 312 (cylindrical body), a pusher member 50, a pressing member 60, and a mechanical transmission mechanism. The pusher member 50 and the pressing member 60 in the third embodiment are substantially similar in configuration to those in the first embodiment, and therefore the same reference numerals as those in the first embodiment are used, and detailed descriptions thereof will be omitted. The main body 312 (cylindrical body) is substantially similar in configuration to those in the first embodiment, except for the configurations of the rotation guide portion 318 and the stopper member 390, and therefore the same reference numerals as those in the first embodiment are used, and detailed descriptions thereof will be omitted.

[0054] <Mechanical transmission mechanism> The mechanical transmission mechanism in the third embodiment is a mechanism that transmits the drive by the rotation operation R of the rotating member 370 to the guide block 54 and converts the extrusion member 50 into a linear movement. The mechanical transmission mechanism has the rotating member 370, the helical groove 378 (first screw portion), the guide block 54, and the screw shaft 58 (second screw portion). In the third embodiment, the screw shaft 58 (second screw portion) is configured only above the guide block 54. The rotating member 370 is a cylindrical member by connecting two half-split bodies 371, 380. A helical groove 378 (first screw portion) is formed on the inner peripheral surface of the rotating member 370. The two half-split bodies 371, 380 of the rotating member 370 are attached rotatably around the axis of the rotation guide part 318 in the main body part 312 (cylindrical body) by the engagement of the engaging part 374 and the engaged part 376. The outer surface of the rotating member 370 is formed with a concave-convex groove 372 that alternates between concave and convex. The concave-convex groove 372 allows the user's finger to hook the rotating member 370 for easy rotation. The mechanical transmission mechanism is formed with a spiral groove 378 (first screw portion) in the rotating member 370, and is attached to the main body 12 so as to be rotatable in the axial direction. The pushing member 50 is formed with a screw shaft 58 (second screw portion) that screws into the spiral groove 378 (first screw portion). This transmits the drive generated by the rotation operation R of the rotating member 370 to the guide block 54, moving the pushing member 50 along the pushing axis A.

[0055] Moreover, the two half-split bodies 371, 380 of the rotating member 370 are configured with guide pins 379 at the four corners of one half-split body 371, and guide holes 381 for receiving the guide pins 379 are configured at the four corners of the other half-split body 380. Also, a stopper member 390 is configured between the rotation guide parts 318 of the main body tube part 14. Here, the two half-split bodies 371, 380 of the rotating member 370 are inserted and held in the guide holes 381 before the engaging part 374 and the engaged part 376 engage with each other. Furthermore, when the two half-split bodies 371, 380 of the rotating member 370 are brought close to each other, the engaging part 374 and the engaged part 376 engage with each other to form a cylindrical member, but the engagement is not completed due to the interference of the stopper member 390. In other words, the half-split body 371 of the rotating member 370 is in a state of riding on the stopper member 390 (floating state). Here, the height at which the stopper member 390 interferes (in the radial direction of the main body tubular portion 14) is set to a height at which the screw shaft 58 cannot be screwed into the helical groove 378 (first screw portion) of the rotating member 370. Also, the axial length of the rotation guide portion 318 of the main body tubular portion 14 is a length that has an extra gap S equal to the axial length of the stopper member 390 compared to the axial length of the rotating member 370. That is, there is a relationship of "axial length of the stopper member 390 = gap S" and "axial length of the rotation guide portion 318 = axial length of the rotating member 370 + axial length of the stopper member 390".

[0056] <Second operation (pressing operation method) Fig. 12, 13> The screw shaft 58 (second screw portion) is held by the stopper member 390 in a state where it is not screwed into the helical groove 378 (first screw portion) of the rotating member 370. When the pressing operation P of the pressing member 60 is performed in this state, the tip surface 62a of the pressing member 60 abuts against the rear end surface 56 of the guide block 54 and is pressed further forward. Then, the guide block 54 is pushed forward by the pressing of the pressing member 60 without the screw shaft 58 (second screw portion) being screwed into the groove of the helical groove 378. As a result, the pushing member 50 moves forward without the rotating member 370 rotating idly, making it possible to push out the intraocular lens 1. As a result, the pushing operation P of the pressing member 60 moves the pushing member 50 along the pushing axis A. That is, the stopper member 390 functions as an "idle release mechanism" that does not allow the rotating member 370 to rotate idly in the mechanical transmission mechanism by the operating force of the pressing operation P of the pressing member 60.

[0057] <First operation (rotation operation method) Fig. 12, 14> On the other hand, when performing the rotation operation R, which is the first operation, the rotation member 370 is slid axially backward by the gap S (the axial length of the stopper member 390) in the rotation guide portion 318 (in other words, slid to an axial position where the stopper member 390 does not interfere). Then, the two half bodies 371, 380 of the rotation member 370 are engaged with the engaging portion 374 and the engaged portion 376, and attached so as to be rotatable around the axis of the rotation guide portion 318. This allows the rotation operation R to be performed in the same manner as in the first embodiment.

[0058] Thus, according to the intraocular lens insertion device according to the embodiment of the present disclosure, the push-out member 50, 250 and the pressing member 60 are configured to be separate, so that the pressing member 60 does not move in conjunction with the rotation operation R by the rotating members 70, 370, and even if the pressing member 60 is touched, it does not become a resistance to the rotation operation R, thereby improving operability. As described above, in an intraocular lens insertion device that is compatible with both the rotation operation method and the pressing operation method, it is possible to improve operability.

[0059] Furthermore, the screw-fit configuration between the rotating members 70, 370 and the pushing members 50, 250 allows the pushing members 50, 250 to be moved reliably, which can favorably improve operability.

[0060] In addition, by disposing the rotating members 70, 370 closer to the tip than the flange portion 16, the rotating members 70, 370 are closer to the tip, which suppresses the shaking of the rotation operation R by the rotating members 70, 370, and improves operability. In addition, since the push-out members 50, 250 are configured to be difficult to touch directly, they can be further prevented from interfering with each other in their operations. In addition, when the pressing operation P is performed by the pressing member 60, the rotating members 70, 370 are in a positional relationship that makes it difficult to come into contact with them, which suppresses resistance to the pressing operation P, and improves operability.

[0061] In addition, since the rotating members 70, 370 in the mechanical transmission mechanism do not rotate freely due to the operating force of the pressing operation P by the pressing member 60, even if the rotating members 70, 370 are touched, there is no resistance to the pressing operation P, thereby further improving operability.

[0062] Furthermore, the rotating members 70, 370 may be disposed between the lens mounting portion 26 and the flange portion 16, at a position spaced apart from the flange portion 16. This results in a positional relationship in which the pressing member 60 is even less likely to come into contact with the rotating members 70, 370 during the pressing operation P.

[0063] 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.

[0064] In this embodiment, the mechanical transmission mechanism is described as being configured such that the rotating member is attached to the cylindrical body so as to be freely rotatable in the axial direction, but is not limited thereto. For example, the mechanical transmission mechanism may be configured such that the rotating member rotates about a rotation axis perpendicular to the extrusion axial direction of the extrusion member. That is, the mechanical transmission mechanism may be configured such that the rotating member rotates around a gear (pinion gear) that is rotated by the rotation of the rotating member, and the extrusion member has teeth (rack bar) cut at a pitch corresponding to that of the gear. In this way, the mechanical transmission mechanism may be configured to convert the drive generated by the rotation of the rotating member into linear movement. [Explanation of symbols]

[0065] 1. Intraocular Lenses 2 Optical Department 2A 1st page 2B 2nd side 2C Outer periphery 3 Support part 3A Front support part 4A Connection part 6A Base part 8A tip part 3B Rear support part 4B Connection part 6B Base part 8B Tip part 10 Intraocular lens insertion device 12 Main body (cylindrical body) 14 Main body cylinder 16 Flange 18 Rotation guide section 18a Circular surface 20 Upper horizontal plane 20a Upper slit 22 Lower horizontal plane 22a Lower slit 24 Tip tube part 26 Lens installation section 28 Top plate 30 Installation unit main body 32 Connecting part 34 Nozzle 36 Insertion section 38 Slanted opening end face 40 Opening tip 42 Slit 44 Tapered section 50 Extrusion member 52 Rod-shaped part 54 Guide block (mechanical transmission mechanism) 56 Rear end surface 58 Screw shaft (second screw part, mechanical transmission mechanism) 60 Pressing member 62 Shaft 62a Tip surface 64 Pressing operation section 66 Slit 68 Claw 70 Rotating parts (mechanical transmission mechanisms) 72 Uneven groove 74 Engagement part 76 Engaged part 78 Spiral groove (first screw part, mechanical transmission mechanism) 200 Intraocular lens insertion device 250 Extrusion parts 252 Rod-shaped part 254a First guide block 254b Second guide block (mechanical transmission mechanism) 256 Rear end surface 257 Through hole (idling release mechanism) 258 Screw shaft (second screw part, mechanical transmission mechanism) 260 Pressing member 262 First shaft 263 Second shaft (idling release mechanism) 264 Pressing operation part 266 Tip surface 300 Intraocular lens insertion device 312 Main body (cylindrical body) 318 Rotation guide section 370 Rotating Parts 371 One half of the body 372 Uneven groove 374 Engagement part 376 Engaged part 378 Spiral groove (first screw part, mechanical transmission mechanism) 379 Guide Pin 380 The other half 381 Guide hole 390 Stopper parts (slip release mechanism) A Extrusion shaft (center shaft) L optical axis R Rotation operation (first operation) P Pressing operation (second operation) S Gap

Claims

1. A cylindrical body having a lens mounting portion in which an intraocular lens is mounted; a push-out member that moves inside the cylindrical body in an axial direction of the cylindrical body to push out the intraocular lens from the lens placement portion; a pressing member that is separate from the pushing member and that presses a rear end of the pushing member along the axial direction to allow the pushing member to move in the axial direction; a mechanical transmission mechanism for converting a drive force generated by a rotation operation of the rotating member into a linear movement; An intraocular lens insertion device capable of pushing out the intraocular lens by moving the pusher member forward independently of the pressing member through a rotational operation of the rotating member in the mechanical transmission mechanism.

2. 2. The intraocular lens insertion device according to claim 1, The mechanical transmission mechanism includes: the rotating member is formed with a first thread portion and is attached to the cylindrical body so as to be rotatable about an axis of the cylindrical body; The extrusion member is formed with a second screw portion that screws into the first screw portion, An intraocular lens insertion device configured to convert drive generated by rotation of the rotating member into linear movement.

3. 2. The intraocular lens insertion device according to claim 1, The rotating member is disposed on the distal end side of a flange portion that protrudes from the outer surface of the cylindrical body and is adapted to hook the fingers of a user's hand, The push-out member is entirely housed within the cylindrical body with the second screw portion meshing with the first screw portion.

4. The intraocular lens insertion device according to any one of claims 1 to 3, an intraocular lens insertion device having an idling release mechanism that prevents the rotating member in the mechanical transmission mechanism from idling due to the operating force of the pressing operation of the pressing member;

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