Patent Publication Number: US-2019192284-A1

Title: Intraocular lens injector

Description:
TECHNICAL FIELD 
     The present invention relates to an intraocular lens injector used for injecting an intraocular lens into an eyeball (intraocular). 
     DESCRIPTION OF RELATED ART 
     Cataract surgery involves the removal of a cloudy crystalline lens by ultrasonic emulsification followed by implantation on an intraocular lens into an eye. Currently, an intraocular lens made of a soft material such as silicone elastomer is used and is injected into an eye using an intraocular lens injector. Patent document 1 discloses an intraocular lens injector with the following configuration: an injector main body containing an injection tube which in turn contains a nozzle portion. At the time of an actual surgery, the nozzle portion of the injection tube is injected into an incisional wound of an eyeball, and the intraocular lens is released from the nozzle portion by a rod contained within the intraocular lens injector. 
     Meanwhile, patent document 2 discloses a configuration of a cartridge used for injecting the intraocular lens, in which a circumferential protrusion is formed on an outer surface of the nozzle portion. When the nozzle portion is inserted into the incisional wound of the eyeball, the circumferential protrusion is brought into contact with the surface of the eyeball, thereby preventing the nozzle portion from being completely inserted into the incisional wound. 
     PRIOR ART DOCUMENT 
     Patent Document 
     [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2015-177845 
     [Patent Document 2] Japanese Patent No. 4685897 
     SUMMARY OF THE INVENTION 
     Problem to be Solved by the Invention 
     Regarding the above-described technologies described in patent documents 1 and 2, each has a different merit. 
     Namely, in the technique described in patent document 1, the nozzle portion can be inserted deeply into the incisional wound of the eyeball since there is no circumferential protrusion on the outer surface of the nozzle portion. When the nozzle portion is inserted deeply into the incisional wound of the eyeball, the intraocular lens can be guided into a lens capsule in a more reliable manner as compared to a shallow insertion. Accordingly, it is possible to forgo the trouble of using forceps or the like for housing the intraocular lens in the lens capsule, the intraocular lens being injected into the eye by the intraocular lens injector. 
     In the technique described in patent document 2, the nozzle portion can be inserted shallowly into the incisional wound of the eyeball due to the presence of a circumferential protrusion on the outer surface of the nozzle. In this instance the intraocular lens can be injected through a smaller incisional wound as compared with a case of a deep insertion. Accordingly, it is possible to use a Wound-assisted method, which reduces the size of the incisional wound and improves healing after surgery. The Wound-assisted method makes it possible to reduce the size of the incisional wound necessary for passage of the intraocular lens by using a tunnel portion of the incisional wound as an injection path for the intraocular lens. 
     Both techniques described above have their own advantages and benefits. Thus it is not surprising that among intraocular lens injector users (principally surgeons such as ophthalmologists), some will prefer a procedure to insert the nozzle portion deeply into the incisional wound of the eyeball while some will prefer the procedure to insert the nozzle portion shallowly, when performing cataract surgery. In order to cater to the preference of each user&#39;s technique, it is necessary to prepare both of having a nozzle portion with a circumferential protrusion or the like formed thereon, and an injector having the nozzle portion with no circumferential protrusion formed thereon. 
     A main object of the present invention is to provide the intraocular lens injector capable of flexibly responding to differences in intraocular lens injection procedure and technique. 
     Means for Solving the Problem 
     A first aspect of the present invention is an intraocular lens injector for injecting an intraocular lens into an eye, including: 
     a hollow body having a nozzle portion; and 
     an attachment member having a protruding surface disposed in a state of protruding to the outside from an outer circumferential surface of the nozzle portion, 
     wherein the attachment member is configured movably with respect to the hollow body. 
     A second aspect of the present invention is the intraocular lens injector according to the first aspect, wherein the attachment member is detachable and attachable from/to the hollow body. 
     A third aspect of the present invention is the intraocular lens injector according to the first or second aspect, wherein the attachment member is movable in an axial direction of the hollow body. 
     A fourth aspect of the present invention is the intraocular lens according to the third aspect, wherein the attachment member is movable in the axial direction of the hollow body while being attached to the hollow body. 
     A fifth aspect of the present invention is the intraocular lens according to any one of the first to fourth aspects, wherein an engaging portion which is engaged with the hollow body is formed in the attachment member, and an engaged portion is formed in the hollow body corresponding to the engaging portion. 
     A sixth aspect of the present invention is the intraocular lens injector according to the fifth aspect, wherein the engaging portion has a lock mechanism in which the attachment member is temporarily fixed to the hollow body by an engagement between the engaging portion and the engaged portion. 
     A seventh aspect of the present invention is the intraocular lens injector according to the fifth aspect, wherein the engaging portion includes a tongue piece having a plurality of engagement holes formed thereon, and the engaged portion includes a locking claw engaged with one of the plurality of engagement holes. 
     An eighth aspect of the present invention is the intraocular lens injector according to any one of the first to seventh aspects, wherein the attachment member is configured to restrict an injection amount by the protruding surface, when the nozzle portion is inserted into an incisional wound of an eyeball. 
     A ninth aspect of the present invention is the intraocular lens injector according to any one of the first to eighth aspects, wherein a viewing window is provided on the attachment member. 
     A tenth aspect of the present invention is the intraocular lens injector according to the ninth aspect, wherein the protruding surface is formed in a shape with an upper part cut out, and the viewing window is formed so as to communicate with a cutout portion of the protruding surface. 
     An eleventh aspect of the present invention is the intraocular lens injector according to any one of the first to tenth aspects, wherein the protruding surface is made of a soft resin. 
     A twelfth aspect of the present invention is the intraocular lens injector according to any one of the first to eleventh aspects, wherein the nozzle portion has a cutout portion formed along an axial direction of the hollow body, and a tapered portion is formed on the attachment member, to reduce an outer circumferential diameter of the nozzle portion, by being brought into contact with an outer circumferential surface of the nozzle portion, which is a portion where the cutout portion is formed. 
     A thirteenth aspect of the present invention is the intraocular lens injector according to any one of the first to twelfth aspects, wherein the hollow body has a lens installing portion, and an intraocular lens is installed on the lens installing portion. 
     Advantage of the Invention 
     According to the present invention, it is possible to respond flexibly to differences in procedures of intraocular lens injection surgery. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         FIG. 1  is a perspective view showing a configuration example of an intraocular lens injector according to a first embodiment of the present invention. 
         FIG. 2A  is a plan view showing a configuration example of the intraocular lens injector according to the first embodiment of the present invention,  FIG. 2B  is a side view,  FIG. 2C  is a sectional view taken along the line E 1 -E 1 . 
         FIG. 3  is a perspective view showing a configuration of an injector main body. 
         FIG. 4A  is a side view showing a configuration of an injector main body,  FIG. 4B  is a sectional view taken along the line F 1 -F 1  in  FIG. 4A , and  FIG. 4C  is an enlarged view of a portion F 2  in  FIG. 4B . 
         FIG. 5A  is a perspective view showing an injector main body in a state in which a rotation restricting part is opened, and  FIG. 5B  is a view seen from arrow G in  FIG. 5A . 
         FIG. 6  is a perspective view showing a configuration and an arrangement of a tip part of the injector main body. 
         FIG. 7  shows the configuration of an injection tube, wherein  FIG. 7A  is a plan view,  FIG. 7B  is a side view, and  FIG. 7C  is a bottom view. 
         FIG. 8  is a cross-sectional view taken along the line H-H in  FIG. 7B . 
         FIG. 9  is a perspective view showing a configuration of an attachment member. 
         FIG. 10  is a three-view diagram showing a configuration of an attachment member, wherein  FIG. 10A  is a plan view,  FIG. 10B  is a side view, and  FIG. 10C  is a rear view. 
         FIG. 11  shows a state in which an attachment member is attached to the injection tube, wherein  FIG. 11A  is a plan view,  FIG. 11B  is a side view, and  FIG. 11C  is a bottom view. 
         FIG. 12  shows a preferable embodiment when the attachment member is used, wherein  FIG. 12A  is a cross-sectional view as seen from the axial direction, and  FIG. 12B  is a cross-sectional view as seen from a direction orthogonal to the axial direction. 
         FIG. 13A  to  FIG. 13C  are views for explaining a procedure of attaching and detaching the attachment member, respectively. 
         FIG. 14  is an enlarged view of a portion E 5  in  FIG. 2 . 
         FIG. 15  is a cross-sectional view taken along the line E 2 -E 2  in  FIG. 2 . 
         FIG. 16A  is a cross-sectional view taken along line E 3 -E 3  in  FIG. 2 , and  FIG. 16B  is a cross-sectional view taken along the line E 4 -E 4  in  FIG. 2 . 
         FIG. 17  is a view for explaining a function of the attachment member. 
         FIG. 18  is a view showing an example of changing a protrusion amount of the nozzle member. 
         FIG. 19  is a perspective view showing a state in which the attachment member is attached to the injection tube in the intraocular lens injector according to a second embodiment of the present invention. 
         FIG. 20  is a perspective view showing a configuration of the injector tube according to the second embodiment of the present invention. 
         FIG. 21  is a perspective view showing a configuration of the attachment member according to the second embodiment of the present invention. 
         FIG. 22  shows the configuration of the attachment member according to the second embodiment of the present invention, wherein  FIG. 22A  is a plan view,  FIG. 22B  is a side view,  FIG. 22C  is a bottom view, and  FIG. 22D  is a rear view. 
         FIG. 23  shows a state in which the attachment member is attached to the injection tube, wherein  FIG. 23A  is a plan view,  FIG. 23B  is a side view, and  FIG. 23C  is a bottom view. 
         FIG. 24A  is a cross-sectional view taken along the line J 2 -J 2  in  FIG. 23 ,  FIG. 24B  is a cross-sectional view taken along the line J 1 -J 1  in  FIG. 23 , and  FIG. 24C  is an enlarged view of portion K in  FIG. 23B . 
         FIG. 25A  is a side view showing a state in which a locking claw is engaged with a rear engagement hole,  FIG. 25B  is a side view showing a state in which the locking claw is engaged with a central engagement hole, and  FIG. 25C  is a side view showing a state in which the locking claw is engaged with a front engagement hole. 
         FIG. 26  is a perspective view showing a configuration of the intraocular lens injector according to a third embodiment of the present invention. 
         FIG. 27A  is a plan view showing a configuration of the intraocular lens injector according to a third embodiment of the present invention, wherein  FIG. 27B  is a side view, and  FIG. 27C  is a cross-sectional view taken along the line M-M in (A). 
         FIG. 28  is a perspective view showing a configuration of the injector main body according to the third embodiment of the present invention,  FIG. 28A  shows a state in which the rotation restricting portion provided in the injector main body is opened, and  FIG. 28B  shows a state in which the rotation restricting portion is closed. 
         FIG. 29  shows a configuration of the injection tube according to a third embodiment of the present invention, wherein  FIG. 29A  is a plan view,  FIG. 29B  is a side view, and  FIG. 29C  is a bottom view. 
         FIG. 30A  is a perspective view of the injection tube as seen obliquely from above according to the third embodiment of the present invention, and  FIG. 30B  is a perspective view as seen diagonally from below. 
         FIG. 31  is a perspective view of the attachment member according to the third embodiment of the present invention as seen obliquely from above, wherein  FIG. 31A  shows the attachment member before being attached to the injection tube, and  FIG. 31B  shows the attachment member after being attached to the injection tube. 
         FIG. 32  shows a configuration of the attachment member according to the third embodiment of the present invention, wherein  FIG. 32A  is a plan view,  FIG. 32B  is a side view, and  FIG. 32C  is a bottom view. 
         FIG. 33  is a view as seen from arrow N in  FIG. 32B . 
         FIG. 34  is a longitudinal sectional view of the attachment member according to the third embodiment of the present invention, showing a state in which the engaging portion is closed. 
         FIG. 35  is a perspective view (part  1 ) showing a procedure for attaching the attachment member according to the third embodiment of the present invention. 
         FIG. 36  is a perspective view (part  2 ) showing a procedure for attaching the attachment member according to the third embodiment of the present invention. 
         FIG. 37  is a longitudinal sectional view showing a state in which the attachment member is attached to the injection tube according to the third embodiment of the present invention. 
         FIG. 38  is a longitudinal sectional view showing a state in which the attachment member attached to the injection tube is moved in an axial direction according to the third embodiment of the present invention. 
         FIGS. 39A to 39D  are views for explaining an arrangement relationship between a plunger and a rotation restricting portion according to the third embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Embodiments of the present invention will be described hereafter, with reference to the drawings. 
     &lt;Configuration of the Intraocular Lens Injector&gt; 
       FIG. 1  is a perspective view showing a configuration example of an intraocular lens injector according to a first embodiment of the present invention. Further,  FIG. 2A  is a plan view showing a configuration example of the intraocular lens injector according to the first embodiment of the present invention,  FIG. 2B  is a side view,  FIG. 2C  is a cross-sectional view taken along the line E 1 -E 1 . 
     An intraocular lens injector  1  is used for injecting an intraocular lens into an eye. In this embodiment, as an example of the intraocular lens, there is provided an intraocular lens  4  as a one-piece type intraocular lens  4  (see  FIG. 6 ) made of a soft material such as silicone elastomer or soft acrylic, including a circular optical portion  4   a  which performs an optical function and two supporting portions  4   b  that curve outward from two positions on the outer circumferential portion of the optical portion  4   a  and extend outward. 
     Further, in this embodiment, in describing a relative positional relationship and a direction of movement and the like of each part of the intraocular lens injector  1 , one of the X axis directions is defined as X1 direction, the other direction is defined as X2 direction, and one of the Y axis directions is defined as Y1 direction, the other direction is defined as Y2 direction, and one of the Z axis directions is defined as Z1 direction and the other direction is defined as Z2 direction, and X1 direction is defined as a front side (frontward), X2 direction is defined as a rear end side (rearward), Y1 direction is defined as a left side (leftward), and Y2 direction is defined as a right side (rightward), Z1 direction is defined as an upper side (upward), and Z2 direction is defined as a downside (downward). Among them, the X axis direction (X1 direction and X2 direction) corresponds to a length direction of the intraocular lens injector  1 , and the Y axis direction (Y1 direction and Y2 direction) corresponds to a width direction of the intraocular lens injector  1 , and the Z axis direction (Z1 direction and Z2 direction) corresponds to a height direction of the intraocular lens injector  1 . 
     The intraocular lens injector  1  has a configuration including an injector main body  5 , a slider  6 , an injection tube  7 , a rotary member  8 , a plunger  9 , a rod  10  (see  FIG. 2C ), and an attachment member  16 . These constituent elements are preferably constituted by resin molded products, respectively. The injector main body  5  and the injection tube  7  have a hollow structure and are coupled to each other to thereby constitute a hollow body. The slider  6  is attached to the injector main body  5 . The injection tube  7  is coupled to the tip part of the injector main body  5 . The rotary member  8  is rotatably connected to a rear end portion of the injector main body  5 . The plunger  9  is disposed coaxially with the injector main body  5 . A part of the plunger  9  is disposed inside of the injector main body  5  through the rotary member  8 , and the other part of the plunger  9  is disposed to protrude rearward from the rotary member  8 . The rod  10  is disposed inside of the hollow body which is composed of the injector main body  5  and the injection tube  7 . The attachment member  16  is a member attached to the hollow body so as to provide a predetermined additional function. 
     (Injector Main Body) 
       FIG. 3  is a perspective view showing the configuration of the injector main body. Further,  FIG. 4A  is a side view showing a configuration of an injector main body,  FIG. 4B  is a cross-sectional view taken along the line F 1 -F 1  in  FIG. 4A , and  FIG. 4C  is an enlarged view of a portion F 2  in  FIG. 4B . 
     The injector main body  5  is formed in a cylindrical shape as a whole. A lens installing portion  11  is provided at the tip part of the injector main body  5 . The intraocular lens  4  is installed on the lens installing portion  11 . The lens installing portion  11  is formed so as to protrude forward from an outer circumferential wall on a lower side of the injector main body  5 . 
     An injection tube coupling portion  5   a  is formed on the outer circumferential portion on the tip side of the injector main body  5 . Slits  12  are respectively formed on both left and right sides of the injector main body  5 . The slits  12  are formed on the tip side of the injector main body  5 . When the slider  6  is attached to the injector main body  5 , the slits  12  movably support the slider  6  in the axial direction (central axis direction) of the injector main body  5 . 
     The rear end of the injector main body  5  opens in a circular shape, through which the plunger  9  and the rod  10  can be inserted into the injector main body  5 . A rotation restricting portion  13 , a flange portion  14 , and a rotation supporting portion  15  are formed at the rear end portion of the injector main body  5  and in the vicinity thereof. The rotation restricting portion  13  restricts a rotation of the plunger  9  inserted into the injector main body  5 . 
       FIGS. 4  (A) to  4  (C) show the injector main body in a state in which the rotation restricting portion is closed. In contrast,  FIG. 5A  is a perspective view showing the injector main body in a state in which the rotation restricting portion is opened, and  FIG. 5B  is a view seen from arrow G in  FIG. 5A . 
     The rotation restricting portion  13  is formed slightly forward of the flange portion  14 . The rotation restricting portion  13  constitutes a part of an outer circumferential wall of the injector main body  5 , and is provided so as to be rotatable around a pivotally supporting portion  13   a  so as to open and close an opening formed on the outer circumferential wall. Further, a pair of sliding guides  13   b  is formed in the rotation restricting portion  13 , and a recessed guide groove  13   c  is formed between these sliding guides  13   b . The pair of sliding guides  13   b  is disposed in a tube of the injector main body  5  when the rotation restricting portion  13  is closed, and is disposed outside of the tube of the injector main body  5  when the rotation restricting portion  13  is opened. A closed state of the rotation restricting portion  13  is maintained, for example, by an engagement of recessed and protruded portions (not shown). When the rotation restricting portion  13  is rotated around the pivotally supporting portion  13   a  against a holding force caused by the engagement of the recessed and protruded portions, as shown in  FIG. 5 , the rotation restricting portion  13  is opened. Tip surfaces of the respective sliding guides  13   b  are formed as anti-falloff portions  13   d  (see  FIG. 4C ). The anti-falloff portions  13   d  prevent the plunger  9  from being pulled out from the injector main body  5 . 
     The flange portion  14  is a portion for hooking a finger (usually an index finger and a middle finger) of a user&#39;s hand, when operating the intraocular lens injector  1  by a push system. The rotation supporting portion  15  is provided slightly rearward of the flange portion  14 . The rotation supporting portion  15  is formed in a ring shape having a stepped structure protruding in a ring shape. 
     As shown in  FIG. 6 , the lens installing portion  11  includes a bottom surface portion  11   a , a lens receiving portion  11   b , and a lens guide portion  11   c . The lens receiving portion  11   b  receives and supports the intraocular lens  4  from below. The intraocular lens  4  is installed on the lens installing portion  11  in a state in which one supporting portion  4   b  is disposed in front and the other supporting portion  4   b  is disposed in rear. The intraocular lens injector  1  is of a preload type in which the intraocular lens  4  is previously installed on the lens installing portion  11  of the injector main body  5 . Therefore, the intraocular lens  4  is one of the components of the intraocular lens injector  1 . However, in executing the present invention, the intraocular lens injector  1  is not necessarily required to be the preload type. 
     A center portion in a width direction of the bottom surface portion  11   a  is slightly recessed. The lens receiving portion  11   b  is formed on both left and right sides of the lens installing portion  11 . The lens receiving portion  11   b  is formed to be one step higher than the bottom surface portion  11   a . This is because when the intraocular lens  4  is supported on the lens receiving portion  11   b , the optical portion  4   a  of the intraocular lens  4  is supported in a floating state from the bottom surface portion  11   a  without contacting the bottom surface portion  11   a . In the same manner as in the lens receiving portion  11   b , the lens guide portion  11   c  is formed on both right and left sides of the lens installing portion  11 . The lens guide portion  11   c  guides the optical portion  4   a  of the intraocular lens  4  supported by the lens receiving portion  11   b  so as to sandwich the optical portion  4   a  from both the left and right sides. The lens guide portion  11   c  is formed in a vertically upright state from the lens receiving portion  11   b . On upper end portions of the left and right lens guide portions  11   c , an inclined surface  11   d  and a restricting portion  11   e  are formed adjacent to each other in the axial direction of the injector main body  5 . The inclined surface  11   d  is formed so as to incline outwardly to easily receive the intraocular lens  4  on the lens installing portion  11 . The inclined surface  11   d  is formed on the tip side of the lens installing portion  11  with respect to the restricting portion  11   e  in the axial direction of the injector main body  5 . The restricting portion  11   e  is formed to protrude toward the center in the width direction of the lens installing portion  11 . The restricting portion  11   e  limits a movable range in a vertical direction of the intraocular lens  4  which is supported by the lens receiving portion  11   b.    
     (Slider) 
     As shown in  FIG. 1 ,  FIG. 2 , and  FIG. 6 , the slider  6  has a configuration including a lens pressing portion  6   a  and a pair of wing portions  6   b . The lens pressing portion  6   a  is disposed at the tip part of the slider  6 , and the pair of wing portions  6   b  is disposed in pairs on the left and right sides of the slider  6 . When the slider  6  is moved forward, as shown in  FIG. 6 , the lens pressing portion  6   a  is disposed so as to advance to the upper side of the optical portion  4   a  of the intraocular lens  4  which is installed on the lens installing portion  11 . 
     The pair of wing portions  6   b  is disposed outside of the outer circumferential wall portion of the injector main body  5 . The pair of wing portions  6   b  is the portions with which a user&#39;s finger (usually an index finger and thumb) is brought into contact, when the slider  6  is moved in the axial direction of the injector main body  5  during use of the intraocular lens injector  1 . The user is a surgeon such as an ophthalmologist performing surgery or a nurse assisting a surgeon. On the outer surface of each wing portion  6   b , unevenness for anti-falloff and a mark (triangular arrow in this embodiment) indicating the moving direction of the slider  6  are formed. Further, the outer surface of each wing portion  6   b  is curved from the rear end side toward the tip side so that the fingers of the user are easily caught, and unevenness for anti-falloff is formed on this curved portion. 
     (Injection Tube) 
       FIG. 7  shows the configuration of an injection tube, wherein  FIG. 7A  is a plan view,  FIG. 7B  is a side view, and  FIG. 7C  is a bottom view. Further,  FIG. 8  is a cross-sectional view taken along the line H-H in  FIG. 7B . 
     The injection tube  7  is a tube for folding the intraocular lens  4  small and guiding it into the eye, when the intraocular lens  4  installed on the lens installing portion  11  is injected into the eye. The injection tube  7  is made of a transparent or translucent material, so that a state of the intraocular lens  4  moving inside of the insertion tube  7  can be visually recognized from the outside. 
     The injection tube  7  has a hollow injection tube main body  7   a  and a narrow tubular nozzle portion  7   b . The injection tube  7  is attached to the tip part of the injection main body  5 . At this time, the lens installing portion  11  of the injector main body  5  is housed and disposed inside of the injector main body  7   a  of the injection tube  7 , together with the intraocular lens  4  installed thereon. An injection hole  7   c  is formed on an upper surface of the injection tube main body  7   a . The injection hole  7   c  is a hole through which a viscoelastic substance (for example, sodium hyaluronate etc.) is injected. The viscoelastic substance injected from the injection hole  7   c  is supplied to the intraocular lens  4  installed on the lens installing portion  11 . 
     Meanwhile, the rear end portion of the injection tube main body  7   a  is opened, and hooking portions  7   d  and wedge portions  7   e  are formed around the opening portion. The hooking portions  7   d  are disposed in pairs at the top and bottom, and the wedge portions  7   e  are disposed in pairs on the right and left. The hooking portions  7   d  are portions to be hooked on the injection tube coupling portion  5   a  of the injector main body  5  when the injection tube  7  is attached to the tip part of the injector main body  5 . The wedge portions  7   e  are portions to be inserted into an entrance portion of the slit  12  of the injector main body  5  when the injection tube  7  is attached to the injector main body  5 . 
     The injection tube main body  7   a  is divided into a first portion  7   f  and a second portion  7   g  in the axial direction of the injection tube  7 . The first portion  7   f  has an internal space capable of housing the lens installing portion  11  of the injector main body  5 , and is formed wider than the second portion  7   g . The second portion  7   g  is located forward of the first portion  7   f . The internal space of the injector main body  7   a  is gradually narrowed from the first portion  7   f  to the second portion  7   g  in order to fold the intraocular lens  4  small when the intraocular lens  4  is pushed out by the rod  10 . 
     A first protrusion  7   h , a second protrusion  7   i , and a third protrusion  7   j  are formed on the second portion  7   g  of the injection tube main body  7   a . These three protrusions  7   h ,  7   i , and  7   j  are formed as engaged portions, correspondingly to an engaging portion  16   b  described later, in order to make an engagement between the attachment member  16  and the injection tube  7 . The first protrusion  7   h  is formed in a state of protruding from one side (left side) surface of the second portion  7   g . The second protrusion  7   i  is formed in a state adjacent to and behind the first protrusion  7   h . The second protrusion  7   i  protrudes from one side (left side) surface of the second protrusion  7   i  with a protrusion amount smaller than that of the first protrusion  7   h . The third protrusion  7   j  is formed to protrude downward from the lower surface of the second portion  7   g . The third protrusion  7   j  is formed displaced rearward from the first protrusion  7   h.    
     The nozzle portion  7   b  is a portion to be inserted into the incisional wound of the eyeball, when the intraocular lens  4  is injected into the eye using the intraocular lens injector  1 . The nozzle portion  7   b  is formed at the tip part of the injection tube  7 . The nozzle portion  7   b  is formed so as to protrude forward from the tip of the second portion  7   g  of the injection tube main body  7   a . The nozzle portion  7   b  is formed in a substantially circular shape when viewed from the axial direction of the injection tube  7 . An outer circumferential diameter of the nozzle portion  7   b  is substantially uniform over an entire length Ln of the nozzle portion  7   b . The tip part of the nozzle portion  7   b  opens with an oblique incisional wound from the top to the bottom, through which the intraocular lens  4  is released to the outside. A cutout portion  7   k  is formed in an opening edge on a lower side of the nozzle portion  7   b . The cutout portion  7   k  is formed along the axial direction of the injection tube  7 . The cutout portion  7   k  is preferably formed in a V shape as shown in the figure. 
     (Attachment Member) 
       FIG. 9  is a perspective view showing a configuration of the attachment member. Further,  FIG. 10  is a three-view diagram showing a configuration of an attachment member, wherein  FIG. 10A  is a plan view,  FIG. 10B  is a side view, and  FIG. 10C  is a rear view. 
     As an example of the additional function described above, the attachment member  16  is a member that provides a function of limiting an injection amount of the nozzle portion  7   b  (hereinafter also referred to as “nozzle injection amount limiting function”) when the nozzle portion  7   b  is inserted into the incisional wound of the eyeball. The nozzle injection amount limiting function is realized (details will be described later) using a tip surface  16   d  of the sleeve portion  16   a  of the attachment member  16 . 
     The attachment member  16  is a member separate from the injection tube  7 , and is configured to be movable with respect to the injection tube  7 . A direction and a form of movement of the attachment member  16  with respect to the injection tube  7  are not particularly limited. For example, movement of the injection tube  7  in the axial direction, movement of the injection tube  7  in a direction intersecting (including orthogonal to) the axial direction of the injection tube  7 , movement of the injection tube  7  in a direction around the axis, and movement of the injection tube  7  in a direction around the axis that intersects (including orthogonal to) the axial direction of the injection tube  7 , and the like can be considered as the direction of the movement. Also, linear movement, rotational movement, twist movement, opening and closing (rocking) movement, expansion and contraction movement, and the like can be considered as the form of the movement. In this embodiment, the attachment member  16  is detachably attached to the injection tube  7  by the movement of the attachment member  16  with respect to the injection tube  7 . “Detachably” described here means that “the attachment member  16  can be attached to the injection tube  7  and the attachment member  16  can be detached from injection tube  7 ”. In the intraocular lens injector  1  of this embodiment, the attachment member  16  may be provided in a state of being attached to the injection tube  7  or in a state of being detached from the injection tube  7  in some cases. In each case, the attachment member  16  is one of the elements constituting the intraocular lens injector  1 . Further, when using the nozzle injection amount limiting function provided by the attachment member  16 , the attachment member  16  is attached to the injection tube  7 , and when the function is not used, the attachment member  16  is detached from the injection tube  7 . In the latter case, namely, even when the attachment member  16  is not used in the intraocular lens injection surgery, the attachment member  16  is still one of the elements constituting the intraocular lens injector  1 . 
     The attachment member  16  includes a sleeve portion  16   a  and an engaging portion  16   b . A through hole  16   c  is formed in the sleeve portion  16   a , so that the nozzle portion  7   b  of the injection tube  7  can be engaged therewith. The through hole  16   c  is formed in a state penetrating the sleeve portion  16   a  in the axial direction. The tip surface  16   d  of the sleeve portion  16   a  is formed to be obliquely inclined with respect to the central axis of the sleeve portion  16   a . The tip surface  16   d  of the sleeve portion  16   a  is disposed in a state of protruding outward (in a direction of enlarging the diameter) from the outer circumferential surface of the nozzle portion  7   b  when the attachment member  16  is attached to injection tube  7 . This shows that the tip surface  16   d  of the sleeve portion  16   a  is a portion corresponding to the “protruding surface”. 
     The shape of the protruding surface is not limited to an annular flat surface that is continuous in a circumferential direction like the tip surface  16   d  of the sleeve portion  16   a , and may be formed in any form as long as it exhibits the nozzle injection amount limiting function. For example, the protruding surface may be discontinuously disposed in the circumferential direction by arrangement at least at one place in the circumferential direction, preferably two places, or three or more places at 180 degrees pitch. Also, the protruding surface may be a curved surface. 
     The engaging portion  16   b  is a portion to be engaged with the injection tube  7  when the attachment member  16  is attached to the injection tube  7 . The engaging portion  16   b  is configured so that it can be engaged with the injection tube  7  and can release the engaged state, in order to make the attachment member  16  detachable from injection tube  7 . The engaging portion  16   b  has a configuration in which a substantially trapezoidal conical outer circumferential wall corresponding to the outer circumferential shape of the injection tube main body  7   a  (second portion  7   g ) of the injection tube  7  is partially cut out. A hook portion  16   e , a stopper portion  16   f , and a viewing window  16   g  are formed in the engaging portion  16   b . Among them, the hook portion  16   e  and the stopper portion  16   f  constitute a locking mechanism for temporarily positioning and fixing the attachment member  16  to the injection tube  7 . The hook portion  16   e  is a portion to be hooked on the first protrusion  7   h  of the injection tube  7 . On the inner circumferential side of the hook portion  16   e , a semicircular recessed portion  16   h  is formed. The recessed portion  16   h  is configured to be able to engage and disengage with/from the second protrusion  7   i  of the injection tube  7  from the direction around the axis of the injection tube  7 . “The direction around the axis” means a direction in which rotation is carried out around the central axis of a certain member. The stopper portion  16   f  is configured so that it can abut against the first protrusion  7   h  of the injection tube  7  from the direction around the axis of the injection tube  7 , and so that it can abut against the third protrusion  7   j  of the injection tube  7  from the axial direction of the injection tube  7 . The viewing window  16   g  is formed in a state in which the upper portion of the engaging portion  16   b  is cutout in a substantially V shape in plan view. The viewing window  16   g  is formed in order to allow a state of the intraocular lens  4  moving inside of the injection tube  7  to be visually recognized from the outside, even when the attachment member  16  is attached to the injection tube  7 . A material of the attachment member  16  is not particularly limited, and for example, metal, ceramic, resin, and the like are used, and a transparent or translucent material is preferable so that the state of the intraocular lens moving inside of the injection tube  7  can be visually recognized from the outside. Further, the protruding surface of the attachment member  16  is in direct contact with a cornea when the intraocular lens is injected into the eye, thereby adding a load on the cornea, and therefore the attachment member  16  is preferably made of a soft resin such as silicone, urethane or the like in order to reduce the load. 
       FIG. 11  shows a state in which the attachment member is attached to the injection tube, wherein  FIG. 11A  is a plan view,  FIG. 11B  is a side view, and  FIG. 11C  is a bottom view. 
     As shown in the figure, in a state in which the attachment member  16  is attached to the injection tube  7 , the nozzle portion  7   b  is engaged with the through hole  16   c  of the sleeve portion  16   a . At this time, the tip surface  16   d  of the sleeve portion  16   a  is disposed in a state protruding outward from the outer circumferential surface of the nozzle portion  7   b , and is disposed in a state inclined in the same direction as the cutout of the nozzle portion  7   b  with respect to the axial direction of the injection tube  7 . 
     In such a case, an inner diameter of the through hole  16   c  of the sleep portion  16   a  may be set to be equal to or slightly larger than the outer circumferential diameter of the nozzle portion  7   b  over an entire axial length of the sleeve portion  16   a , in order not to deform the shape of the nozzle portion  7   b  engaged with the through hole  16   c . Further, as other preferable embodiment, as shown in  FIG. 12A  and  FIG. 12B , a tapered portion  16   i  may be formed in a part of the through hole  16   c  of the sleeve portion  16   a . The tapered portion  16   i  is formed such that the diameter of the through hole  16   c  is gradually decreased toward the tip of the sleeve portion  16   a , on the tip side of the sleeve portion  16   a . A minimum diameter of the through hole  16   c  in the tapered portion  16   i  is set to be smaller than an outer circumferential diameter of the nozzle portion  7   b . Thereby, in a state in which the attachment member  16  is attached to the insertion tube  7 , the tapered portion  16   i  comes into contact with the outer circumferential surface of the nozzle portion  7   b  and a portion where the cut portion  7   k  is formed. Therefore, on the tip side of the sleeve portion  16   a , the outer circumference diameter of the sleeve portion  16   a  is reduced by a contact with the tapered portion  16   i.    
     Meanwhile, the hook portion  16   e  of the engaging portion  16   b  is hooked on the first protrusion  7   h . At this time, the recessed portion  16   h  is in a state of being engaged with the second protrusion  7   i  (see  FIG. 12A ). Further, the stopper portion  16   f  of the engaging portion  16   b  is in a state of approaching or contacting the third protrusion  7   j  of the injection tube  7 . At this time, positioning of the attachment member  16  with respect to the injection tube  7  is performed as follows. Namely, in the direction around the axis of the injection tube  7 , the position of the attachment member is determined when the recessed portion  16   h  is engaged with the second protrusion  7   i  of the injection tube  7 , and when the hook portion  16   e  is hooked on the first protrusion  7   h  of the injection tube  7 . Further, in the axial direction of the injection tube  7 , the position of the attachment member  16  is determined when the stopper portion  16   f  abuts on the third protrusion  7   j.    
     Here, when the attachment member  16  is detached from the insertion tube  7 , the engagement state between the attachment member  16  and the insertion tube  7  is released by moving the attachment member  16  in the axial direction of the injection tube  7 , after rotating the attachment member  16  in the direction around the axis of the injection tube  7 . Specifically, first, the attachment member  16  is turned in a direction of the arrow as shown in  FIG. 13A , thereby making the stopper portion  16   f  of the engaging portion  16   b  brought into contact with or close to the first protrusion  7   h  of the injection tube main body  7   a  as shown in  FIG. 13B . Thereby, the hook portion  16   e  of the engaging portion  16   b  is disengaged from the first protrusion  7   h  of the injection tube  7 , and the recessed portion  16   h  (see  FIGS. 10 and 12 ) inside of the hook portion  16   e  is disengaged from the second protrusion  7   i . Next, as shown in  FIG. 13C , the attachment member  16  is pulled out in the direction of the arrow along the axial direction of the injection tube  7 . Thereby, the attachment member  16  can be detached from the injection tube  7 . 
     Meanwhile, when the attachment member  16  is attached to the injection tube  7 , the attachment member  16  is engaged with the injection tube  7  by a procedure reverse to the above, namely, the attachment member  16  is moved in the axial direction of the injection tube  7 , and thereafter the attachment member  16  is rotated and moved in the direction around the axis of the injection tube  7 . Specifically, the attachment member  16  is engaged with the injection tube  7  from the direction opposite to the arrow as shown in  FIG. 13C , thereby making the stopper portion  16   f  of the engaging portion  16   b  brought into contact with or close to the third protrusion  7   j  of the injection tube  7  as shown in  FIG. 13B . Next, by turning the attachment member  16  in the opposite direction to the direction of detachment, the hook portion  16   e  of the engaging portion  16   b  is hooked on the first protrusion  7   h  of the injection tube  7 , and the recessed portion  16   h  is engaged with the second protrusion  7   i . Thereby, the attachment member  16  can be attached to the injection tube  7 . In this way, the attachment member  16  is attached to the injection tube  7 , and in this state, the movement of the attachment member  16  with respect to the axial direction of the injection tube  7  is restricted due to the engagement (contact) between the first protrusion  7   h  and the hook portion  16   e  and due to the engagement (contact) between the third protrusion  7   j  and the stopper portion  16   f . Therefore, the attachment member  16  cannot be moved in the axial direction of the injection tube  7 . In other words, the position of the attachment member  16  is fixed in the axial direction of the injection tube  7 . Further, the engagement state between the engaging portion  16   b  of the attachment member  16  and the engaging portion ( 7   h ,  7   i ,  7   j ) of the injection tube  7  is not released unless the attachment member  16  attached to the injection tube  7  is rotated in the direction around the axis of the injection tube  7 , because it is impossible to move the attachment member  16  in the axial direction of the injection tube  7  as described above. 
     (Rotary Member) 
     As shown in  FIG. 14 , the rotary member  8  is attached to the rear end portion of the injector main body  5 . In this attachment state, the rotary member  8  is disposed coaxially with the injector main body  5 , and is rotatably supported in the direction around the axis of the injector main body  5 . The rotary member  8  is formed in a cylindrical shape. The tip end and the rear end of the rotary member  8  are each opened in a circular shape. As shown in  FIG. 1  and  FIG. 2 , a plurality of ridges  8   a  are formed on the outer circumferential surface of the rotary member  8 . Each of the ridges  8   a  is formed to be parallel to the axial direction of the rotary member  8 . The rotary member  8  is a portion rotated by a user when the intraocular lens injector  1  is used by a screw system. At this time, when the plurality of ridges  8   a  are formed on the outer circumferential surface of the rotary member  8 , the finger of the user is caught on the ridges  8   a , so that it becomes easy to rotate the rotary member  8 . 
     First threaded portions  8   b  are formed on the inner circumferential surface of the rotary member  8 . The first threaded portions  8   b  are formed at a predetermined pitch. Further, two window portions  8   c  are formed on the tip part of the rotary member  8 . The two window portions  8   c  are formed at intervals of 180 degrees in the circumferential direction. These window portions  8   c  are portions for visually checking whether or not the injector main body  5  and the rotary member  8  are properly coupled. A pair of hooking claws  8   d  is formed on the inner circumferential portion of the tip of the rotary member  8 . The pair of hooking claws  8   d  is hooked on the rotation supporting portion  15  of the injector main body  5  when the rotary member  8  is coupled to the rear end portion of the injector main body  5 . Each of the hooking claws  8   d  is formed in the vicinity of the opening on the tip side of the rotary member  8  adjacent to each of the window portions  8   c . The rotary member  8  is rotatably supported in the direction around the axis of the injector main body  5  in a state in which the pair of hook claws  8   d  are hooked on the rotation supporting portion  15 . Further, the pair of hook claws  8   d  is fitted between the flange portion  14  of the injector main body  5  and the rotation supporting portion  15 . Therefore, the rotary member  8  is freely rotatable around the axis of the injector main body  5  but does not move in the axial direction of the injector main body  5 . 
     (Plunger) 
     The plunger  9  is disposed coaxially with the injector main body  5 . The plunger  9  is provided movably in the axial direction of the injector main body  5 . The plunger  9  has a bar shaped plunger shaft  9   a . As shown in  FIG. 15 , the tip part of the plunger  9  serves as a seal material attachment portion  9   b .  FIG. 15  is a cross-sectional view taken along the line E 2 -E 2  in  FIG. 2 . The seal material attachment portion  9   b  is composed of two circular disk portions having an outer circumferential diameter slightly smaller than the inner diameter of the injector main body  5 , and a seal member  17  is attached between the two disk portions. As the seal material  17 , for example, an  0  ring can be used. When the plunger  9  is moved in the axial direction (frontward) of the injector main body  5 , the seal member  17  is brought into contact with the inner circumferential surface of the injector main body  5 , thereby generating an appropriate sliding resistance. 
     The longitudinal sectional shape of the plunger shaft  9   a  is substantially cruciform as shown in  FIG. 16A  and  FIG. 16B .  FIG. 16A  is a cross-sectional view taken along the line E 3 -E 3  in  FIG. 2 , and  FIG. 16B  is a cross-sectional view taken along the line E 4 -E 4  in  FIG. 2 . As shown in  FIG. 1  and  FIG. 2 , second threaded portions  9   c  are formed on the upper surface and the lower surface of the plunger shaft  9   a , respectively. The second threaded portions  9   c  are formed corresponding to the first threaded portions  8   b  of the rotary member  8 . Therefore, the second threaded portions  9   c  are formed at the same pitch as the first threaded portions  8   b . The second threaded portions  9   c  are held in a state of constantly meshing with the first threaded portions  8   b  of the rotary member  8 . Therefore, when the rotary member  8  is rotated, the plunger  9  moves in the axial direction of the injector main body  5  in accordance with a rotation direction and a rotation amount of the rotary member  8 . The plunger  9  is a portion to be pushed in by the user when using the intraocular lens injector  1  by the push system. Here, the second threaded portions  9   c  of the plunger  9  and the corresponding first threaded portions  8   b  of the rotary member  8  mesh with each other in a relationship of groove threads and screw threads, and in this meshing portion, the first threaded portions  8   b  and the second threaded portions  9   c  are inclined at a predetermined taper angle with respect to the Z axis (vertical direction in the figure) as shown in  FIG. 14 . When the taper angle of these screw portions  8   b ,  9   c  is adjusted (set) to an appropriate angle, it is possible to rotate the rotary member  8  with little sense of resistance when the plunger  9  is pushed in. Particularly, in a case of 5° or more and 15° or less of the taper angle θ at the rear of the second threaded portions  9   c  in contact with the first threaded portions  8   b  of the rotary member  8  when the plunger  9  is pushed in, the rotary member  8  idles without catching the threaded portions  8   b ,  9   c , at the time of a forward movement of the plunger  9  by the pushing operation, which is preferable. Further, in order to efficiently apply a load to the rotary member  8 , which is necessary for moving the plunger  9  forward by the pushing operation, it is desirable to set a groove width (dimension in the Y axis direction) between the threaded portions  9   c  of the plunger  9  to 1.0 mm or more and 4.0 mm or less. Also, regarding a screw pitch, it is desirable to adjust the screw pitch in accordance with a release load of an installed intraocular lens. 
     The tip side of the plunger  9 , including the seal member attachment portion  9   b , is disposed so as to be inserted into the injector main body  5 , and the rear end side of the plunger  9  is disposed so as to protrude rearward from the rotary member  8 . In an initial state before use, a protruding dimension Lp (see  FIG. 2  (B)) of the plunger  9  with a rear end position of the rotary member  8  as a reference, is set to be equal to or larger than a movement dimension of the rod  10  required to push out the intraocular lens  4  from the tip of the injection tube  7 . Here, the initial state before use refers to a state before an operation is performed for pushing out the intraocular lens  4  using the rod  10  when using the intraocular lens injector  1 . In the intraocular lens injector  1  of this embodiment, the rod  10  can be moved forward by either of the rotational operation of the rotary member  8  and the pushing operation of the plunger  9 . Therefore, the initial state before use is the state in which neither the rotational operation of the rotation member  8  nor the pushing operation of the plunger  9  is performed. 
     In the initial state before use, the plunger  9  is largely drawn out so that the protruding dimension Lp of the plunger shaft  9   a  is substantially maximum or close to the maximum. In this state, the seal material attachment portion  9   b  of the plunger  9  is disposed in a state of being in proximity to or in contact with the rotation restricting portion  13  of the injector main body  5 . At this time, the seal material attachment portion  9   b  of the plunger  9  is opposed to the anti-falloff portions  13   d  of the rotation restricting portion  13 . Therefore, when attempting to move the plunger  9  rearward from the initial state before use, the seal material attachment portion  9   b  abuts on the anti-falloff portions  13   d . Thereby, fall-off of the plunger  9  from the injector main body  5  is prevented. 
     Further, when the tip side of the plunger  9  is inserted into the injector main body  5  together with the rod  10 , as shown in  FIG. 5 , the rotation restricting portion  13  is set in an opened state. Thereby, the tip side of the plunger  9  with the seal member  17  can be inserted into the injector main body  5  without interference with the rotation restricting portion  13 . Further, in this state, when the rotation restricting portion  13  is closed so as to be engaged with the plunger shaft  9   a  of the plunger  9 , as shown in  FIG. 16A  and  FIG. 16B , a part of the plunger shaft  9   a  (a portion where the second threaded portion  9   c  is formed) is engaged with the guide groove  13   c  of the sliding guide  13   b . At this time, as shown in  FIG. 16B , the two opposing surfaces of the guide groove  13   c  are disposed so as to support a part of the plunger shaft  9   a  from both sides. Thereby, the plunger  9  is supported movably in the axial direction of the injector main body  5 . However, the rotation of the plunger  9  with respect to the axial direction of the injector main body  5  is restricted by the rotation restricting portion  13 . 
     (Rod) 
     The rod  10  serves as releasing the intraocular lens  4  from the tip part (opening of the nozzle portion  7   b ) of the injection tube  7 , by pushing out the intraocular lens  4  forward, the intraocular lens  4  being installed on the lens installing portion  11 . The rod  10  is formed in an elongated rod shape. The rod  10  is coupled to the tip part of the plunger  9  and moves integrally with the plunger  9  in the axial direction of the hollow body. 
     &lt;Method of Using the Intraocular Lens Injector&gt; 
     Next, a method of using the intraocular lens injector  1  will be described. First, the user injects a viscoelastic substance into the injection hole  7   c  of the injection tube  7 . Thereby, the viscoelastic substance is supplied to the intraocular lens  4  installed on the lens installing portion  11  of the injector main body  5 . 
     Next, the user moves the slider  6  forward. Thereby, a lens abutting portion (not shown) formed at the tip part of the slider  6  comes into contact with the intraocular lens  4 , and pushes out the intraocular lens  4  as it is. Then, the intraocular lens  4  is deformed into a predetermined shape. When the intraocular lens  4  is deformed by the movement of the slider  6  in this manner, the intraocular lens  4  can be easily folded into a desired shape when the intraocular lens  4  is pushed out by the rod  10  by a subsequent operation. 
     Next, the user operates the intraocular lens injector  1  by the push system or the screw system to move the rod  10  forward together with the plunger  9 , thereby releasing the intraocular lens  4  from the nozzle portion  7   b  of the injection tube  7 . At this time, the rod  10  is brought into contact with the intraocular lens  4  while moving forward, and pushes out the intraocular lens  4  as it is. Then, the intraocular lens  4  moves inside of the injection tube  7  while being folded into a predetermined shape, and is released from the opening at the tip of the nozzle portion  7   b . Accordingly, the intraocular lens  4  can be injected into the eye in a small folded state by releasing the intraocular lens  4  in a state in which the nozzle portion  7   b  of the injection tube  7  is inserted into the incisional wound of the eyeball. Further, after intraocular injection, the intraocular lens  4  can be restored to its original shape by a restoring force of the intraocular lens  4  itself. 
     &lt;Effect of First Embodiment&gt; 
     Next, an effect of the intraocular lens injector  1  according to a first embodiment of the present invention will be described. 
     The intraocular lens injector  1  of this embodiment can cope with two different operation methods, that is, a screw system and a push system. The screw system is a method of pushing out the intraocular lens  4  by the rotational operation of the rotary member  8 , and the push system is a method of pushing out the intraocular lens  4  by a pushing operation of the plunger  9 . Therefore, in using the intraocular lens injector  1 , a user who prefers the screw system can push out the intraocular lens  4  by rotating the rotary member  8 , and a user who prefers the push system can push out the intraocular lens  4  by pushing the plunger  9 . Each operation method will be described below. 
     (Screw System) 
     When the intraocular lens injector  1  is used by the screw system, the user rotates the rotary member  8 . Specifically, while rotating the injector body  5  with one hand, the rotary member  8  is rotated with the other hand. At this time, the first threaded portions  8   b  of the rotary member  8  and the second threaded portions  9   c  of the plunger  9  are always kept in mesh with each other, including the initial state before use. Therefore, when the rotary member  8  is rotated in a predetermined direction (clockwise direction as seen from the rear end side of the intraocular lens injector  1 ), the plunger  9  moves forward in accordance with the rotation of the rotary member  8 , and the rod  10  also moves forward together with the movement of the plunger  9 . Further, since the rotation of the plunger  9  in the direction around the axis of the injector main body  5  is restricted by the rotation restricting portion  13 , the plunger  9  and the rod  10  move forward without rotating in the direction around the axis of the injector main body  5 . Thereby, the intraocular lens  4  installed on the lens installing portion  11  of the injector main body  5 , is pushed out from the tip of the nozzle portion  7   b  by the movement of the rod  10 . 
     (Push System) 
     When the intraocular lens injector  1  is used by the push system, an operation of pushing the plunger  9  is performed by the user. Specifically, a thumb is pressed against the rear end portion of the plunger  9  while hooking an index finger and a middle finger on the flange portion  14  of the injector main body  5 . Then, in this state, the plunger  9  is pushed forward. Then, a pushing force applied to the plunger  9  is converted to a force for rotating the rotary member  8  by the meshing between the first threaded portions  8   b  and the second threaded portions  9   c . Therefore, when the plunger  9  is pushed forward, the plunger  9  moves forward together with the rod  10  and the rotary member  8  rotates in accordance with the movement of the plunger  9 . Further, since the rotation of the plunger  9  in the direction around the axis of the injector main body  5  is restricted by the rotation restricting portion  13 , the plunger  9  and the rod  10  move forward without rotating in the direction around the axis of the injector main body  5 . Thereby, the intraocular lens  4  installed on the lens installing portion  11  of the injector main body  5 , is pushed out from the tip of the nozzle portion  7   b  by the movement of the rod  10 . 
     In this manner, the intraocular lens injector  1  of this embodiment can cope with either one of the operation methods such as the screw system and push system. Accordingly, the user of the intraocular lens injector  1 , can select either one of the operation methods, according to his/her preference, or according to other reasons, circumstances etc. Thereby, with one intraocular lens injector  1 , it is possible to flexibly cope with differences in procedures of an intraocular lens injection surgery. Further, it is possible to cater to both users of the user who prefers the screw system and the user who prefers the push system. Further, the first threaded portions  8   b  of the rotary member  8  and the second threaded portions  9   c  of the plunger  9 , are always in mesh with each other, including the initial state before use. Therefore, in the case of operating by the screw system, the intraocular lens  4  can be pushed out only by rotating the rotary member  8 . Further, in the case of operating by the push system, the first threaded portions  8   b  and the second threaded portions  9   c  are held in mesh with each other from the start to the end of the operation. Therefore, vibration or the like is unlikely to occur during the pushing operation of the plunger  9 . 
     (Nozzle Insertion Amount Limiting Function of the Attachment Member) 
     According to the intraocular lens injector  1  of this embodiment, it is possible to utilize the nozzle insertion amount limiting function provided by the attachment member  16  or to avoid its use. Specifically, the attachment member  16  is configured to be movable with respect to the injection tube  7 , thereby making it possible to attach and detach the attachment member  16  to/from the injection tube  7 . Therefore, in the state in which the attachment member  16  is attached to the injection tube  7 , the nozzle insertion amount limiting function can be used, and in the state in which the attachment member  16  is detached from the injection tube  7 , use of the nozzle insertion amount limiting function can be avoided. Explanation will be given hereinafter for a case of using the nozzle insertion amount limiting function and a case of not using the nozzle insertion amount limiting function separately. 
     (Case of Using the Nozzle Insertion Amount Limiting Function) 
     When using the nozzle insertion amount limiting function provided by the attachment member  16 , the attachment member  16  is set in a state of being attached to the injection tube  7 . Thereby, the nozzle portion  7   b  of the injection tube  7  is partially covered with the sleeve part  16   a  of the attachment member  16 . The nozzle insertion amount limiting function is exhibited by contact of the tip surface  16   d  of the sleeve part  16   a  with the outer surface  50   b  of the cornea  50 , when an incisional wound  50   a  is formed in the periphery of the cornea  50  of the eyeball, and the nozzle portion  7   b  of the injection tube  7  is inserted into the incisional wound  50   a  in a cataract surgery as shown in  FIG. 17 . At this time, the tip surface  16   d  of the sleeve part  16   a  functions as a stopper for limiting further insertion of the nozzle portion  7   b , by contact of the tip surface  16   d  of the sleeve part  16   a  with the outer surface  50   b  of the cornea  50 , and by this stopper function, the insertion amount of the nozzle portion  7   b  is limited. 
     Here, when the Wound-assisted method is applied, it is desirable to set a relative position of the injection tube  7  and the attachment member  16 , so that the protruding amount (Maximum value) L 1  of the nozzle portion  7   b  with respect to the tip surface  16   d  of the sleeve part  16   a  is 1.0 mm or more and 1.2 mm or less. Thereby, it is possible to limit the insertion amount of the nozzle portion  7   b  with respect to the incisional wound  50   a  of the cornea  50  to be equivalent to the protrusion amount L 1 . Accordingly, the intraocular lens  4  can be released from the tip of the nozzle portion  7   b  in a state of shallowly inserting the nozzle portion  7   b  into the incisional wound  50   a  of the cornea  50 . Further, in order to use the nozzle insertion amount limiting function, the movement of the attachment member  16  with respect to the axial direction of the insertion tube  7  is restricted by the engagement between the first protrusion  7   h  and the hook portion  16   e  and the engagement between the third protrusion  7   j  and the stopper portion  16   f  in a state in which the attachment member  16  is attached to the injection tube  7 . Therefore, after the intraocular lens  4  is released from the tip of the nozzle portion  7   b , the tip surface  16   d  of the attachment member  16  can be separated from the outer surface  50   b  of the cornea  50  simultaneously with pulling out the nozzle portion  7   b  from the incisional wound  50   a  of the cornea  50 . Further, when using the nozzle insertion amount limiting function, as described above, the injection tube  7  and the attachment member  16  are used in a combined state. Therefore, the engaging portion  16   b  of the attachment member  16  and the engaging portion ( 7   h ,  7   i ,  7   j ) of the injection tube  7  are always maintained in an engagement state, and the engagement state is not canceled. 
     (Case of not using the nozzle insertion amount limiting function) 
     Meanwhile, when the nozzle insertion amount limiting function provided by the attachment member  16  is not used, the attachment member  16  is detached from the injection tube  7 . Thereby, the nozzle portion  7   b  of the injection tube  7  is in a state in which its entire body is exposed to the outside without being covered by the sleeve portion  16   a  of the attachment member  16 . Therefore, when the nozzle portion  7   b  of the injection tube  7  is inserted into the incisional wound  50   a  of the cornea  50 , the nozzle portion  7   b  can be inserted more deeply than in the case of using the nozzle insertion amount limiting function described above. Accordingly, the intraocular lens  4  can be released from the tip of the nozzle portion  7   b  in a state in which the nozzle portion  7   b  is deeply inserted into the incisional wound  50   a  of the cornea  50 . 
     In this manner, in the intraocular lens injector  1  of this embodiment, the nozzle insertion amount limiting function can be used by attaching the attachment member  16  to the insertion tube  7 , and in addition, use of the nozzle insertion amount limiting function can be avoided by detaching the attachment member  16  from the injection tube  7 . Accordingly, the user of the intraocular lens injector  1 , can use the nozzle insertion amount limiting function or to avoid using it, according to his/her preference, or according to other reasons, circumstances etc. Thereby, even if there are user who prefers the procedure for inserting the nozzle portion  7   b  deeply into the incisional wound  50   a  of the eye ball and user who prefers the procedure to shallowly insert the nozzle portion  7   b , it is possible to flexibly deal with the preference of each user&#39;s technique. 
     Further, if a plurality of attachment members  16  having different sizes (particularly, lengths) of the sleeve portions  16   a  are prepared, it is possible to change (increase or decrease) the protrusion amount of the nozzle portion  7   b  with respect to the tip surface  16   d  of the sleeve portion  16   a , depending on the size of attached member  16  attached to injection tube  7  when using the nozzle insertion amount limiting function. For example, when it is desired to change the protrusion amount to a protrusion amount (for example, 5.0 mm or more and 6.5 mm or less) larger than the protrusion amount L 1  of the nozzle portion  7   b  shown in  FIG. 17 , as shown in  FIG. 18 , the protrusion amount (maximum value) L 2  of the nozzle portion  7   b  can be secured to be larger than the protrusion amount L 1  by using the attachment member  16  having a size compatible with the above protruding amount, for attachment to the injection tube  7 . Thereby, the insertion amount can be changed when inserting the nozzle portion  7   b  into the incisional wound  50   a  of the cornea  50 . 
     The intraocular lens injector  1  of this embodiment exhibits the effect of (hereinafter referred to as a “first effect”) enabling selection of the operation method of the intraocular lens injector  1  from the screw system and the push system, and the effect of (hereinafter referred to as a “second effect”) enabling selection as to whether or not to use the nozzle insertion amount limiting function. However, the first effect and the second effect are obtained by different configurations. Namely, the first effect is obtained by a configuration (hereinafter referred to as “first configuration”) including the injector main body  5 , the rotary member  8 , the plunger  9 , and the rod  10  described above, and the second effect is obtained by a configuration (hereinafter referred to as a “second configuration”) including the injection tube  7  and the attachment member  16  described above. Therefore, the first effect can be obtained even without the second configuration and the second effect can be obtained even without the first configuration. 
     Further, this embodiment employs a configuration in which the outer circumferential diameter of the nozzle portion  7   b  can be reduced by forming the tapered portion  16   i  in the through hole  16   c  of the attachment member  16  and bringing the tapered portion  16   i  into contact with the outer circumferential surface of the nozzle portion  7   b . Thereby, even if the size of the incisional wound formed on the eyeball is reduced, the tip part of the nozzle portion  7   b  can be easily inserted into the incisional wound. Further, when the intraocular lens  4  is passed through the nozzle portion  7   b  in a folded state in a predetermined shape, the nozzle portion  7   b  is pressed by the intraocular lens  4  from the inside and is deformed. At this time, if the cutout portion  7   k  is formed in the nozzle portion  7   b , even if the nozzle portion  7   b  is pressed by the intraocular lens  4  and is deformed, damage such as cracks and the like are less likely to occur in the nozzle portion  7   b . Further, an amount of deformation of the nozzle portion  7   b  is suppressed to minimum necessary for releasing the intraocular lens  4 . Therefore, the intraocular lens  4  can be injected from a smaller incisional wound. 
     Further, this embodiment employs a configuration in which a viewing window  16   g  is formed on the attachment member  16 . Therefore, even when the intraocular lens injector  1  is used with the attached member  16  attached to the injection tube  7 , the state of the intraocular lens  4  moving inside of the insertion tube  7  can be visually recognized from the outside through the viewing window  16   g . Accordingly, the user of the intraocular lens injector  1  can operate the intraocular lens injector  1  while visually checking the state of the intraocular lens  4  pushed out by the rod  10 , even when the attachment member  16  is attached. 
     Second Embodiment 
     Next, a second embodiment of the present invention will be described. 
       FIG. 19  is a perspective view showing a state in which the attachment member is attached to the injection tube in the intraocular lens injector according to a second embodiment of the present invention. Hereinafter, the configuration of the injection tube and the attachment member according to the second embodiment of the present invention will be described in detail. 
     (Injection Tube) 
       FIG. 20  is a perspective view showing the configuration of the injector tube according to the second embodiment of the present invention. 
     The injection tube  7  differs from that of the first embodiment only in the configuration of the engaged portion. Namely, the first embodiment employs a configuration in which the engaged portion is configured by three protrusions  7   h ,  7   i ,  7   j , but the second embodiment employs a configuration in which the engaged portion is configured by one locking claw  7   m . The locking claw  7   m  is formed in a substantially U-shape from both side surfaces to the lower surface of the second portion  7   g  of the injection tube main body  7   a , when viewed from the front. Further, the locking claw  7   m  is formed to protrude downward from the lower surface of the second portion  7   g.    
     (Attachment Member) 
       FIG. 21  is a perspective view showing the configuration of the attachment member according to the second embodiment of the present invention. Further,  FIG. 22  shows the configuration of the attachment member according to the second embodiment of the present invention, wherein  FIG. 22A  is a plan view,  FIG. 22B  is a side view,  FIG. 22C  is a bottom view, and  FIG. 22D  is a rear view. 
     The attachment member  16  includes a sleeve portion  16   a  and an engaging portion  16   b  similarly to the first embodiment, but the configuration of the engaging portion  16   b  is different. Namely, in the engaging portion  16   b , a tongue piece  16   j  is integrally formed in addition to the viewing window  16   g , but the hook portion  16   e  and the stopper portion  16   f  are not formed. The tongue piece  16   j  is formed so as to extend from the lower portion of the engaging portion  16   b  in the axial direction of the attachment member  16 . The tongue piece  16   j  is formed in a ladder shape having three engagement holes  16   k . In the following description, the three engagement holes  16   k  are distinguished by identification codes such as  16   k - 1 ,  16   k - 2 , and  16   k - 3 . The three engagement holes  16   k - 1 ,  16   k - 2 , and  16   k - 3  are formed side by side so as to be adjacent to each other with a predetermined interval in the axial direction of the attachment member  16 . Further, the three engagement holes  16   k - 1 ,  16   k - 2 , and  16   k - 3  are sequentially disposed from the front toward the rear in the axial direction of the attachment member  16 . The attachment member  16  has a configuration in which the locking claw  7   m  of the injection tube  7  is engaged with any one of the three engagement holes  16   k - 1 ,  16   k - 2 , and  16   k - 3 , thereby being engaged with the injection tube  7 . 
       FIG. 23  shows a state in which the attachment member is attached to the injection tube, wherein  FIG. 23A  is a plan view,  FIG. 23B  is a side view, and  FIG. 23C  is a bottom view. Further,  FIG. 24A  is a cross-sectional view taken along the line J 2 -J 2  in  FIG. 23 ,  FIG. 24B  is a cross-sectional view taken along the line J 1 -J 1  in  FIG. 23 , and  FIG. 24C  is an enlarged view of portion K in  FIG. 23B . 
     In the state in which the attachment member  16  is attached to the injection tube  7  as shown in the figure, the nozzle portion  7   b  is fitted into the through hole  16   c  of the sleeve portion  16   a . Further, the locking claw  7   m  formed on the injection tube  7  is engaged with the central engaging hole  16   k - 2  among the three engagement holes  16   k - 1 ,  16   k - 2 , and  16   k - 3  formed on the tongue piece  16   j  of the attachment member  16 . At this time, the tip surface  16   d  of the sleeve portion  16   a  is disposed to protrude outward from the outer circumferential surface of the nozzle portion  7   b , and is disposed in a state inclined in the same direction as the cutout of the nozzle portion  7   b  with respect to the axial direction of the injection tube  7 . 
     When using the nozzle insertion amount limiting function, the locking claw  7   m  is engaged with any one of the three engagement holes  16   k - 1 ,  16   k - 2 , and  16   k - 3 . In this case, the protrusion amount of the nozzle portion  7   b  with respect to the tip surface  16   d  of the sleeve portion  16   a  is changed depending on which engagement holes  16   k  is used for engagement with the locking claw  7   m .  FIG. 25A  is a side view showing a state in which the locking claw  7   m  is engaged with the rear engagement hole  16   k - 3 . In this state, the attachment member  16  is disposed relatively closer to the front in the axial direction of the injection tube  7 . Therefore, the protrusion amount of the nozzle portion  7   b  becomes relatively small. In contrast,  FIG. 25B  is a side view showing a state in which the locking claw  7   m  is engaged with the central engagement hole  16   k - 2 . In this state, the protrusion amount of the nozzle portion  7   b  becomes larger in the state of  FIG. 25A .  FIG. 25C  is a side view showing a state in which the locking claw  7   m  is engaged with the front engaging hole  16   k - 1 . In this state, the attachment member  16  is disposed relatively closer to the rear side in the axial direction of the injection tube  7 . Therefore, the protrusion amount of the nozzle portion  7   b  becomes larger in the state of  FIG. 25B . 
     As described above, in the second embodiment of the present invention, the protrusion amount of the nozzle portion  7   b  can be changed (adjusted) to three levels of large, medium, and small, by appropriately moving the attachment member  16  in the axial direction of the injection tube  7  so that the locking claw  7   m  is engaged with one of the engagement holes  16   k  of the tongue piece  16   j . Further, if more engagement holes  16   k  are formed on the tongue piece  16   j  of the attachment member  16 , the protrusion amount of the nozzle portion  7   b  can be changed in more stages. Further, if the attachment member  16  is pressed in the axial direction of the injection tube  7  in a state in which the locking claw  7   m  of the injection tube  7  is engaged with the central engagement hole  16   k - 2 , the tongue piece  16   j  of the attachment member  16  is elastically deformed (bending deformation) upon receiving a pressing force, and as a result, the locking claw  7   m  is engaged with the adjacent engagement hole  16   k - 1  or  16   k - 3 . Therefore, the protrusion amount of the nozzle portion  7   b  can be changed while the attachment member  16  is attached to the injection tube  7 . Thereby, the protrusion amount of the nozzle portion  7   b  can be changed without attaching or detaching the attachment member  16  to or from the injection tube  7 . Therefore, it is possible to save labor for detaching the attachment member  16  from the injection tube  7  and labor for placing the attachment member  16  on a tray or the like. Further, there is no risk of the user inadvertently dropping or losing the attachment member  16  detached from the injection tube  7 . 
     Further, when the nozzle insertion amount limiting function is not used, for example, the entire body of the nozzle portion  7   b  can be exposed by releasing the engagement state between the locking claw  7   m  and the tongue piece  16   j  and pulling out the attachment member  16  from the injection tube  7 . Alternatively, it is also acceptable that the entire body of the nozzle portion  7   b  is exposed when the attachment member  16  is moved backward by a predetermined amount while the attachment member  16  is attached to the injection tube  7 , and in this state, the attachment member  16  is engaged with the injection tube  7  by the engagement between the locking claw  7   m  and the engagement hole  16   k . When this configuration is employed, it is possible to switch whether or not to use the nozzle insertion amount limiting function without detaching the attachment member  16  from the injection tube  7 . Therefore, the attachment member  16  is not required to be detachable from the injection tube  7 . 
     Third Embodiment 
       FIG. 26  is a perspective view showing a configuration of the intraocular lens injector according to a third embodiment of the present invention. Further,  FIG. 27A  is a plan view showing the configuration of the intraocular lens injector according to the third embodiment of the present invention, wherein  FIG. 27B  is a side view, and  FIG. 27C  is a cross-sectional view taken along the line M-M in (A). 
     In the intraocular lens injector  1  according to the third embodiment of the present invention, a position and a configuration of the rotation restricting portion  13 , a configuration of part of the plunger  9 , a configuration of the injection tube  7 , and a configuration of the attachment member  16  are different. 
     (Position and Configuration of the Rotation Restricting Portion) 
       FIG. 28  is a perspective view showing a configuration of the injector main body according to the third embodiment of the present invention,  FIG. 28A  shows a state in which the rotation restricting portion provided in the injector main body is opened, and  FIG. 28B  shows a state in which the rotation restricting portion is closed. 
     The rotation restricting portion  13  is formed at the rear end portion of the injector main body  5  located slightly rearward of the flange portion  14  in the axial direction of the injector main body  5 . When the rotary member  8  is attached to the rear end portion of the injector main body  5 , the rotation restricting portion  13  is disposed inside of the rotary member  8  (see  FIG. 27C ). Therefore, the entire body of the rotation restricting portion  13  is shielded by the rotary member  8 . The function, the configuration, and the like of the rotation restricting portion  13  are basically the same as those of the first embodiment. 
     As described above, by employing a configuration in which the rotation restricting portion  13  is formed at the rear end portion of the injector main body  5  and the rotation restricting portion  13  is shielded by the rotary member  8  attached thereto, it is possible to shorten a length of the injector main body  5  and reduce a size of the intraocular lens injector  1 , compared to the first embodiment. Further, after assembling the intraocular lens injector  1 , the rotation restricting portion  13  is hidden inside of the rotary member  8 , and therefore the rotation restricting portion  13  cannot be opened. Therefore, it is possible to reduce the risk of decomposing the intraocular lens injector  1  by a surgeon or the like. Further, it is not necessary to form the rotation restricting portion  13  in front of the flange portion  14 , and therefore it is possible to reinforce the flange portion  14  by forming reinforcing ribs  18  on the outer circumferential surface of the injector main body  5 . Thereby, even when a strong force is applied to the flange portion  14  by the operation by the push system, deformation of the flange portion  14  can be suppressed. 
     Note that the third embodiment employs a configuration in which the entire body of the rotation restricting portion  13  is shielded by the rotary member  8 . However, the present invention is not limited thereto, and it is possible to reduce the risk of decomposing the intraocular lens injector  1  by a surgeon or the like, as long as at least a part of the rotation restricting portion  13  is shielded by the rotary member  8 . Further, the position of the rotation restricting portion  13  employed in the third embodiment can also be employed in the first embodiment and the second embodiment. 
     Further, the third embodiment employs a hook mechanism, in order to hold the rotation restricting portion  13  in a closed state. For example as shown in  FIG. 39A , the hook mechanism includes a first hook claw  13   e  formed in the rotation restricting portion  13  and a second hook claw  19  formed on the outer circumferential surface of the injector main body  5 .  FIGS. 39A to 39D  each shows a case in which the rotation restricting portion  13  is viewed from behind the injector main body  5 . 
     The first hook claw  13   e  is formed on the opposite side of the pivotally supporting portion  13   a  in the rotation restricting portion  13 . The pivotally supporting portion  13   a  connects the rotation restricting portion  13  and the injector main body  5  and supports the rotation restricting portion  13  so as to be rotatable (openable and closable). The second hook claw  19  is formed on the opposite side of the pivotally supporting portion  13   a  in the left-right direction. 
     In the hook mechanism having the above configuration, when the rotation restricting portion  13  is closed from the opened state, the first hook claw  13   e  of the rotation restricting portion  13  is caught by the second hook claw  19  of the injector main body  5  and locked. At this time, in a radial direction of the injector main body  5 , the first hook claw  13   e  is disposed relatively outside, and the second hook claw  19  is disposed relatively inside. Further, the plunger  9  is fitted into a guide groove  13   c  formed between the pair of sliding guides  13   b  of the rotation restricting portion  13 . Therefore, when the rotary member  8  is rotated so as to use the intraocular lens injector  1  by the screw system, the rotation of the plunger  9  in the direction around the axis of the injector main body  5  is restricted by the rotation restricting portion  13 . 
     Further, since the first threaded portions  8   b  of the rotary member  8  and the second threaded portions  9   c  of the plunger  9  are meshed with each other. Therefore, when the rotary member  8  is rotated so as to move the plunger  9  forward, a rotational force Fr is applied to the plunger  9  by the rotation of the rotary member  8 . When the rotational force Fr is applied to the plunger  9 , the rotation restricting portion  13  is pushed by the plunger  9 . As a result, the first hook claw  13   e  of the rotation restricting portion  13  is pressed against the second hook claw  19 . Therefore, it is possible to hold the first hook claw  13   e  and the second hook claw  19  in a locked state. Accordingly, there is no possibility that the first hook claw  13   e  and the second hook claw  19  are disengaged during the rotational operation of the rotary member  8 . 
     In contrast, for example as shown in  FIG. 39B , when a positional relationship between the pivotally supporting portion  13   a  of the rotation restricting portion  13  and the first hook claw  13   e  is right/left reversed, and when the second hook claw  19  is formed on the injector main body  5  in accordance with the reversed positional relationship, there is a possibility that the first hook claw  13   e  and the second hook claw  19  are disengaged during the rotational operation of the rotary member  8 . Specifically, when the rotational force Fr is applied to the plunger  9  by the rotational operation of the rotary member  8 , there is a case that the rotation restricting portion  13  is deformed or displaced by being pushed by the rotational force Fr, depending on the characteristics of a material constituting the injector main body  5  (including the rotation restricting portion  13 ). As a result, there is a possibility that the first hook claw  13   e  is displaced outwardly and disengaged from the second hook claw  19 . Therefore, as shown in  FIG. 39A , it is preferable that the rotational force Fr applied to the plunger  9  by the rotational operation of the rotary member  8  is applied in a direction to press the first hook claw  13   e  against the second hook claw  19 . 
     Further, as shown in  FIG. 39C , it is also possible to employ a configuration in which the first hook claw  13   e  of the rotation restricting portion  13  is disposed relatively inside and the second hook claw  19  of the injector main body  5  is disposed relatively outside. In this configuration as well, the rotational force Fr applied to the plunger  9  by the rotational operation of the rotary member  8  is applied in a direction to press the first hook claw  13   e  against the second hook claw  19 . Therefore, there is no possibility that the first hook claw  13   e  and the second hook claw  19  are disengaged during the rotational operation of the rotary member  8 . Incidentally, as shown in  FIG. 39D , when the positional relationship between the pivotally supporting portion  13   a  of the rotation restricting portion  13  and the first hook claw  13   e  is right/left reversed, and when the second hook claw  19  is formed on the injector main body  5  in accordance with the reversed positional relationship, there is a case that the rotation restricting portion  13  is deformed or displaced by being pushed by the rotational force Fr applied to the plunger  9 . As a result, there is a possibility that the first hook claw  13   e  is pushed outwardly and disengaged from the second hook claw  19 . Therefore, it is preferable to employ the configuration shown in  FIG. 39C . 
     Note that the hook mechanism shown in  FIGS. 39A to 39D  can be applied to the first embodiment and the second embodiment described above, and in this case as well, it is preferable to employ the configuration shown in  FIG. 39A  or  FIG. 39C . 
     (Configuration of the Plunger) 
     A pressing plate portion  9   d  is formed at the rear end portion of the plunger  9 . The pressing plate portion  9   d  is a portion for pressing a thumb of a surgeon in a case of the operation by the push system, and is formed so as to protrude radially more than the plunger shaft  9   a . In the pressing plate portion  9   d , unevenness may be provided on the surface against which the surgeon&#39;s thumb is pressed, for anti-falloff purpose. 
     When the pressing plate portion  9   d  is provided at the rear end portion of the plunger  9  as described above, the operation by the push system becomes easy. Further, the rear end portion of the plunger  9  comes into contact with the thumb on a wider surface compared with the first embodiment. Therefore the load applied to the thumb at the time of pushing the plunger  9  is dispersed. Therefore, a burden on the thumb can be reduced. 
     The configuration in which the pressing plate portion  9   d  is provided at the rear end portion of the plunger  9 , can be employed in the first embodiment and the second embodiment described above. 
     (Configuration of the Injection Tube) 
       FIG. 29  shows a configuration of the injection tube according to the third embodiment of the present invention, wherein  FIG. 29A  is a plan view,  FIG. 29B  is a side view, and  FIG. 29C  is a bottom view. Further,  FIG. 30A  is a perspective view of the injection tube according to the third embodiment of the present invention as seen obliquely from above, and  FIG. 30B  is a perspective view as seen diagonally from below. 
     The injection tube  7  has a hollow injection tube main body  7   a  and a narrow tubular nozzle portion  7   b , and an injection hole  7   c  is formed on the upper surface of the injection tube main body  7   a . The injection tube main body  7   a  is divided into a first portion  7   f  and a second portion  7   g . Further, the rear end portion of the injection tube main body  7   a  is opened, and a hook portion  7   d  and a wedge portion  7   e  are formed around the opening portion. A cutout portion  7   k  is formed in the nozzle portion  7   b . The above points are similar to those of the first embodiment. 
     An engaged portion  71  is formed on a lower surface side of the first portion  7   f  of the injection tube main body  7   a . Two small protrusions  71   a ,  71   b  and a recessed groove  71   c  are formed in the engaged portion  71 . The small protrusion  71   b  is disposed between the small protrusion  71   a  and the recessed groove  71   c  in the axial direction of the injection tube  7 . The small protrusion  71   a  has a slope  71   d . The slope  71   d  has an inclination such that the protrusion amount of the small protrusion  71   a  is gradually increased toward the tip side of the injection tube  7 . 
     A pair of right and left guide ribs  72  is formed, on both sides of the second portion  7   g  of the injection tube main body  7   a . The pair of guide ribs  72  performs a guide function for relatively positioning the injection tube  7  and the attachment member  16  in the direction around the axis of the injection tube  7  when the attachment member  16  is attached to the injection tube  7 . The pair of guide ribs  72  is formed so as to protrude like wings from both sides of the injection tube main body  7   a  (the second portion  7   g ). 
     (Configuration of the Attachment Member) 
       FIG. 31  is a perspective view of the attachment member according to a third embodiment of the present invention as seen obliquely from above,  FIG. 31A  shows the attachment member before being attached to the injection tube, and  FIG. 31B  shows the attachment member after being attached to the injection tube. Further,  FIG. 32  shows a configuration of the attachment member according to the third embodiment of the present invention, wherein  FIG. 32A  is a plan view,  FIG. 32B  is a side view, and  FIG. 32C  is a bottom view. Further,  FIG. 33  is a view as seen from arrow N in  FIG. 32B . Note that  FIG. 32  shows the attachment member before being attached to the injection tube. 
     As in the first embodiment, the attachment member  16  is a member that provides the nozzle insertion amount limiting function. The material of the attachment member  16  is preferably a resin, more preferably a transparent or translucent resin. The attachment member  16  is desirably made of an integrally molded product of resin. The attachment member  16  is a member separate from the injection tube  7 , and is configured to be movable with respect to the injection tube  7 . A movable direction of the attachment member  16  with respect to the injection tube  7  is an axial direction of the injection tube  7 . Further, the third embodiment is configured as follows: although the attachment member  16  cannot be detached from the insertion tube  7  after the attachment member  16  is attached to the injection tube  7 , the attachment member  16  can move in the axial direction of the injection tube  7  while the attachment member  16  is attached to the injection tube  7  (details will be described later). 
     A tip surface  161  as a protruding surface is formed at the tip part of the attachment member  16 . The protruding surface of the attachment member  16  is a portion that directly comes into contact with a cornea when the intraocular lens is injected into the eye. Therefore, in order not to damage the cornea as much as possible, a body portion (excluding the portion of the protruding surface) of the attachment member  16  may be formed of hard resin, and the portion of the protruding surface may be formed of a soft resin such as silicone or urethane. The tip surface  161  as the protruding surface is formed in a shape (C shape) in which the upper part of an annular ring is cut out. 
     A viewing window  162  is formed in the upper part of the attachment member  16 . A punched hole  163  is formed on the bottom of the attachment member  16 . The viewing window  162  is formed to allow the state of the intraocular lens  4  moving inside of the injection tube  7  to be visually recognized from the outside, even when the attachment member  16  is attached to the injection tube  7 . A width of the viewing window  162  is gradually narrowed from the rear end side toward the tip side of the attachment member  16  in accordance with a change in the width of the injection tube  7 . The tip side of the viewing window  162  is opened without being closed and communicates with a cutout portion of the tip surface  161 . Therefore, even when the attachment member  16  is attached to the injection tube  7 , the whole part from the injection tube main body  7   a  of the injection tube  7  to the nozzle portion  7   b  can be viewed from the outside through the viewing window  162 . Accordingly, when the intraocular lens  4  is pushed out through the nozzle portion  7   b  of the injection tube  7 , it is possible to visually recognize the state of the intraocular lens  4  moving inside of the injection tube  7  without being disturbed by the attachment member  16 . 
     A pair of left and right side plate portions  164  are provided on both sides of the attachment member  16 . As shown in  FIG. 34 , a slit groove  164   a  is formed on the inner surface of each side plate portion  164 . The slit groove  164   a  is formed corresponding to the guide rib  72  of the injection tube  7 . Note that  FIG. 34  is a longitudinal sectional view of the attachment member according to a third embodiment of the present invention, showing a state in which the engaging portion  167  is closed. Grip portions  165  are formed on the outer surface of each side plate portion  164 . The grip portions  165  are provided on the left and right sides of the attachment member  16  in order to be able to grip the attachment member  16  with an index finger and a thumb when the surgeon or the like handles the attachment member  16 . Each grip portion  165  has a concavo-convex structure so that a surgeon or the like can grip the attached member  16  easily. 
     A bridge portion  166  and an engaging portion  167  are provided at the rear portion of the attachment member  16 . The bridge portion  166  is formed at an upper portion of the attachment member  16  so as to bridge between the pair of side plate portions  164 . A part of the bridge portion  166  is formed by being bent into a waveform so as not to block the injection hole  7   c  when the attachment member  16  is attached to the injection tube  7 . The bridge portion  166  is connected to the engaging portion  167  by a connecting portion  168 . The connecting portion  168  is provided in one of the left and right directions. The connecting portion  168  is formed thin so as to have moderate flexibility. The engaging portion  167  is rotatably supported around the connecting portion  168  at the center (fulcrum) by utilizing the flexibility of the connecting portion  168 .  FIG. 33  shows a state in which the engaging portion  167  is opened, and from this state, by rotating the engaging portion  167  in a direction indicated by the two-dot chain line arrow in the figure, the engaging portion  167  can be closed. When the attachment member  16  is attached to the injection tube  7 , by rotating the engaging portion  167  so as to close it, the engaging portion  167  can be engaged with the engaged portion  71 . 
     A coupling claw  169  is formed in the bridge portion  166 . The coupling claw  169  is formed to protrude on the side opposite to the connecting portion  168  in the left-right direction. Meanwhile, a coupling hole  170  corresponding to the coupling claw  169  is formed in the engaging portion  167 . The coupling claw  169  and the coupling hole  170  serve as annularly coupling the bridge portion  166  and the engaging portion  167 , by connecting the bridge portion  166  and the engaging portion  167  on the side opposite to the connecting portion  168 . Specifically, the coupling claw  169  and the coupling hole  170  are engaged with each other and connected by rotating the engaging portion  167  so as to be closed, with the connecting portion  168  as a center. Thereby, the bridge portion  166  and the engaging portion  167  can be annularly coupled. When the attachment member  16  is attached to the injection tube  7 , the bridge portion  166  is disposed on the upper side of the injection tube main body  7   a  (the first portion  7   f ), and the engaging portion  167  is disposed on the lower side of the injection tube main body  7   a . Therefore, the injection tube main body  7   a  is surrounded by the bridge portion  166  and the engaging portion  167 . Further, in a state in which the bridge portion  166  and the engaging portion  167  are coupled, their inner circumferential surfaces have a shape corresponding to the outer circumferential surface of the injection tube main body  7   a.    
     The engaging portion  167  has a fixing piece  171  and a movable piece  172  extending forward from the fixing piece  171 . A hole  173  is formed between the movable piece  172  and the fixing piece  171 . The movable piece  172  has a bending property, with the connecting portion between the fixed piece  171  and the movable piece  172  as a fixed end and the tip part  172   a  of the movable piece  172  as a free end (referred to as “leaf spring property” hereafter). The fixing piece  171  and the movable piece  172  are formed corresponding to the small protrusions  71   a  and  71   b  and the recessed groove  71   c  constituting the engaged portion  71  of the injection tube  7 . The tip part  172   a  of the movable piece  172  is configured to be able to get over the small protrusion  71   a  by moving along the slope  71   d  of the small protrusion  71   a . Then, the tip part  172   a  of the movable piece  172  gets over the small protrusion  71   a  along the slope  71   d , whereby the attachment member  16  moves forward, and the protrusion amount of the nozzle portion  7   b  is changed. 
     A coupling bar  174  is formed at a lower portion of the attachment member  16  so as to bridge between the pair of side plate portions  164 . The coupling bar  174  is disposed so as to be opposed to the tip part  172   a  of the movable piece  172  when the engaging portion  167  is closed. In the axial direction of the attachment member  16 , a punched hole  163  is formed in front of the coupling bar  174 . 
     (Procedure for Attaching the Attachment Member) 
     Next, a procedure for attaching the attachment member  16  to the injection tube  7  will be described. Note that attachment of the attachment member  16  is performed in a manufacturing process (assembly process) of the intraocular lens injector  1 . 
     First, as shown in  FIG. 35 , the attachment member  16  with the engaging portion  167  opened, is disposed in front of the nozzle portion  7   b  of the injection tube  7 . 
     Next, as shown in  FIG. 36 , by bringing the attachment member  16  and the injection tube  7  relatively closer to each other, the attachment member  16  is put on the outside of the injection tube  7 . At this time, the attachment member  16  is inserted to the rear end portion of the injection tube  7 . Then, the nozzle portion  7   b  protrudes from the tip surface  161  of the attachment member  16  by a predetermined amount. Further, when the attachment member  16  is inserted into the injection tube  7 , a pair of guide ribs  72  formed on the injection tube  7  is engaged with a pair of slit grooves  164   a  formed in the attachment member  16  so as to correspond to the pair of guide ribs  72 . Thereby, the injection tube  7  and the attachment member  16  are positioned in the direction around the axis of the injection tube  7 . 
     Next, by rotating the engaging portion  167  so as to be closed, with the connecting portion  168  of the attached member  16  as a center, the coupling hole  170  of the engaging portion  167  and the coupling claw  169  of the bridge portion  166  are fitted and connected to each other. Thereby, the bridge portion  166  and the engaging portion  167  are annularly coupled. 
     With the above procedure, the attachment member  16  can be attached to the injection tube  7 . The attachment member  16  cannot be detached from the injection tube  7  after the attachment member  16  is attached to the injection tube  7 . Namely, in the third embodiment of the present invention, the attachment member  16  cannot be detached from the injection tube  7 . However, the attachment member  16  is configured to be movable with respect to the injection tube  7 . This point will be described hereafter. 
     First, as described above, when the attachment member  16  is attached to the injection tube  7 , the positional relationship between the small protrusion  71   a , the small protrusion  71   b , the recessed groove  71   c  of the injection tube  7 , and the fixing piece  171 , the movable piece  172 , the coupling bar  174  of the attachment member  16 , is as shown in  FIG. 37 . Namely, the small protrusion  71   a  is disposed between the tip part  172   a  of the movable piece  172  and the coupling bar  174 , and the small protrusion  71   b  is disposed between the tip part  172   a  of the movable piece  172  and the fixing piece  171 , in the axial direction of the injection tube  7 . Further, the tip part  172   a  of the movable piece  172  is disposed in contact (or close proximity) to a front surface of the small protrusion  71   b  adjacent to the slope  71   d  of the small protrusion  71   a , and the coupling bar  174  is disposed in contact (or close proximity) to an entire surface of the small protrusion  71   a.    
     When the attachment member  16  is moved from the above state, first, a surgeon or the like grips a pair of gripping portions  165  formed on both sides of the attachment member  16  with two fingers (usually an index finger and a thumb). Next, a force in a direction P is applied to the attachment member  16  while gripping the pair of gripping portions  165  with fingers. Then, the movable piece  172  formed at the lower part of the attachment member  16 , is deformed due to the leaf spring property of the movable piece  172  itself, while contacting the slope  71   d  of the small protrusion  71   a  of the injection tube  7 . Then, the tip part  172   a  of the movable piece  172  moves along the slope  71   d , and the movable piece  172  returns to an original shape due to its own leaf spring property when getting over the protruding end portion of the small protrusion  71   a.    
     Thereby, the positional relationship between the small protrusion  71   a , the small protrusion  71   b , the recessed groove  71   c  of the injection tube  7 , and the fixing piece  171 , the movable piece  172 , the coupling bar  174  of the attachment member  16 , is as shown in  FIG. 38 . Namely, the small protrusion  71   a  is disposed between the tip part  172   a  of the movable piece  172  and the fixing piece  171 , and the small protrusion  71   b  is also disposed between the tip part  172   a  of the movable piece  172  and the fixing piece  171  in the axial direction of the injection tube  7 . Further, the tip part  172   a  of the movable piece  172  is disposed in contact (or close proximity) to the front surface of the small protrusion  71   a , and the fixing piece  171  is disposed in contact (or close proximity) to the rear surface of the small protrusion  71   b.    
     As described above, in this embodiment, the attachment member  16  can move in the axial direction of the injection tube  7 , while the attachment member  16  is attached to the injection tube  7 . Therefore, the protrusion amount of the nozzle portion  7   b  can be changed, while the attachment member  16  is attached to the injection tube  7 . Thereby, the surgeon who prefers the procedure for inserting the nozzle portion  7   b  deeply into the incisional wound of an eyeball, uses the intraocular lens injector  1  in a state shown in  FIG. 37 , and the surgeon who prefers the procedure for shallowly inserting the nozzle portion  7   b , can use the intraocular lens injector  1  in a state shown in  FIG. 38 . Accordingly, the surgeon performing the cataract surgery can selectively use the intraocular lens injector  1  according to the procedure of his/her choice. 
     Note that the third embodiment employs the configuration in which the protrusion amount of the nozzle portion  7   b  can be adjusted in two stages by allowing the attachment member  16  to move in the axial direction of the injection tube  7 . However, the present invention is not limited to this configuration, and it is also acceptable to employ a configuration in which the protrusion amount of the nozzle portion  7   b  can be adjusted in multiple stages of three or more stages. 
     Further, the third embodiment employs the configuration in which the attachment member  16  cannot be returned to the position (backward) before the movement, due to the contact between the tip part  172   a  of the movable piece  172  and the small protrusion  71   a , after the attachment member  16  attached to the injection tube  7  is moved forward. However, the present invention is not limited to this configuration, and it is also acceptable to employ a configuration in which the attachment member  16  can be returned to its original position. 
     Modified Example, Etc 
     The technical scope of the present invention is not limited to the embodiment described above but includes various modes and modifications as far as the specific effects obtained by the constituent features of the invention and combinations thereof can be derived. 
     For example, in the above embodiment, the plunger  9  and the rod  10  are formed as separate members, but they may be formed as an integral structure. 
     Further, in the above embodiment, the viewing window  16   g  is formed in a state in which a part of the attachment member  16  is cut out. However, the present invention is not limited thereto, and a hole (not shown) having a proper size may be formed in a part of the attachment member  16 , and this hole may be used as a viewing window. 
     Further, in the above embodiment, the injector main body  5  and the injection tube  7  are mutually assembled to form a hollow body. However, the hollow body may have an integral structure (such as an integrally molded product of resin). 
     Further, in the above embodiment, the slider  6  is included in one of the components of the intraocular lens injector  1 . However, the slider  6  is an auxiliary member for folding the intraocular lens  4  into a desired shape, and is not always necessary to inject the intraocular lens  4  into the eye. Therefore, it is not necessary to provide the slider  6 , as long as the intraocular lens  4  can be folded into a desired shape merely by pushing out the intraocular lens  4  using the rod  10 , for example by devising the configuration of the lens installing portion  11  in the injector main body  5  and the configuration of the tip of the rod  10 . 
     DESCRIPTION OF SIGNS AND NUMERALS 
     
         
         
           
               1  Intraocular lens injector 
               4  Intraocular lens 
               5  Injector main body 
               7  Injection tube 
               7   b  Nozzle portion 
               7   k  Cutout portion 
               7   m  Locking claw 
               8  Rotary member 
               9  Plunger 
               9   c  Second threaded portion 
               10  Rod 
               11  Lens installing portion 
               13  Rotation restricting portion 
               13   d  Anti-falloff portion 
               16  Attachment member 
               16   a  Tip surface 
               16   b  Engaging portion 
               16   g  Viewing window 
               16   i  Tapered portion 
               16   j  Tongue piece 
               16   k  Engagement hole