Patent Publication Number: US-2021161653-A1

Title: Intraocular lens injector

Description:
TECHNICAL FIELD 
     The present invention relates to an intraocular lens injector. 
     DESCRIPTION OF RELATED ART 
     Cataract surgery involves the removal of a cloudy crystalline lens by ultrasonic emulsification followed by implantation of an intraocular lens into an eye. Currently, an intraocular lens made of a soft material such as silicone elastomer is injected into an eye using an intraocular lens injector. 
     This kind of intraocular lens injector may have various shapes. For example, the intraocular lens injector described in Patent Document 1 has a plurality of handles 24 (flanges) that serve as members on which the operator places his/her fingers when injecting the intraocular lens 1, as illustrated in FIG. 4 of Patent Document 1. 
     PRIOR ART DOCUMENT 
     Patent Document 
     
         
         [Patent Document 1] Japanese Unexamined Patent Publication No. 2007-185255 
       
    
     SUMMARY OF THE INVENTION 
     Problem to be Solved by the Invention 
     The operation of the intraocular lens injector is very delicate. Therefore, it is an urgent problem to improve the workability of the operator. In particular, a smooth operation of the plunger at the time of injecting an intraocular lens contributes to a significant improvement in workability. 
     It is a technical problem of the present invention to provide an intraocular lens injector capable of smoothly performing an operation at the time of injecting an intraocular lens. 
     Means for Solving the Problem 
     The present inventors observed the condition of the operator&#39;s hand at the time of injecting the intraocular lens. In an example described in Patent Document 1, the arrangement of the flanges is vertically symmetrical, as illustrated in FIG. 4( b ). With this arrangement, the operator does not feel much load on his/her fingers when he/she starts to push the plunger with his/her thumb, regardless of whether he/she puts his/her index finger and middle finger on the upper side and the lower side of the front flange, respectively, or he/she puts his/her index finger and middle finger on the upper side and the lower side of the rear flange, respectively. On the other hand, in the case of using the rear flange, the distance between the flange and the rear end portion of the plunger (the portion pressed by the thumb) is shortened when the plunger is finished being pressed, and the operator feels a large load on his/her fingers. A large load can be a factor which destabilizes an operation. When the front flange is used, the distance between the flange and the rear end of the plunger can be secured to some extent, but it is better to reduce the load on the operator, if possible. 
     Focusing on this point, the present inventors have devised a configuration in which a plurality of flanges is provided and the shape of the front flange is to be vertically non-symmetrical. 
     The configurations obtained based on the above findings are as follows. 
     A first aspect of the invention provides 
     an intraocular lens injector, including:
         a hollow body having a lens setting portion on which an intraocular lens is set;   a plunger that moves through an inside of the hollow body in an axial direction of the hollow body;   a pushing member that pushes out the intraocular lens from the lens setting portion by moving together with the plunger, through the inside of the hollow body, and toward front part of the axial direction of the hollow body;   a first flange protruded from an outer circumferential surface of the hollow body; and   a second flange arranged on a rear end side with respect to the first flange and protruded from the outer circumferential surface of the hollow body,       

     wherein the hollow body is configured so that a shape of the first flange on the A direction side toward a center of gravity of the hollow body in which the first flange is arranged from a center of the hollow body, and a shape of the first flange on the A′ direction side which is the opposite direction to the A direction, are non-symmetrical, when viewed from the axial direction, and 
     the second flange is configured to protrude toward at least the A′ direction, when the hollow body is viewed from the axial direction, and 
     the first flange is configured not to protrude toward the A′ direction, or configured so that a protruding distance of the first flange toward the A′ direction is smaller than a protruding distance of the first flange toward the A direction and smaller than a protruding distance of the second flange toward the A′ direction. 
     A second aspect of the present invention is the invention according to the first aspect, wherein the first flange on the A direction side and the second flange on the A′ direction side, are configured so that a protruding distance thereof is 10 mm or more. 
     A third aspect of the present invention is the invention according to the first or second aspect, wherein the lens setting portion is arranged on a tip end side with respect to the first flange, and the lens setting portion is arranged in the A direction when viewing the hollow body from the axial direction. 
     A fourth aspect of the present invention is the invention according to the first aspect, 
     wherein the first flange on the A direction side and the second flange on the A′ direction side, are configured so that a vertically protruding distance thereof in the axial direction of the hollow body is 10 mm or more, 
     the lens setting portion is arranged on a tip end side with respect to the first flange, and 
     the lens setting portion is arranged in the A direction when viewing the hollow body from the axial direction. 
     A fifth aspect of the present invention is the invention according to any one of the first to fourth aspects, wherein at least one of the first flange and the second flange has a configuration movable in the axial direction of the hollow body. 
     A sixth aspect of the present invention is the invention according to the fifth aspect, 
     wherein indexes corresponding to at least one of the first flange and the second flange are provided to the hollow body, and at least one of the displayed indexes is varied according to a movement of at least one of the first flange and the second flange. 
     The protruding distances of the first flange on the A direction side and the second flange on the A′ direction side are preferably 15 mm or more, and a preferable example of the upper limit is 20 mm. 
     The separation distance between the first flange and the second flange in the axial direction of the hollow body is preferably 10 to 60 mm, and more preferably 10 to 35 mm. 
     Moreover, it is preferable that the second flange is provided as a distinct body separated from the first flange. 
     Furthermore, as for arrangement in the axial direction, the first flange is preferably arranged closer to the second flange compared to the midpoint of the distance between the nozzle provided at the front tip end of the hollow body and the second flange. 
     The protruding distances of the first flange and the second flange may be the same or different from each other. When they are different, it is preferable that the protruding distance of the first flange is 50% or more (preferably 60% or more, more preferably 60 to 140%, and still more preferably 80 to 120%) based on the protruding distance of the second flange. 
     Another aspect of the present invention is as follows. In addition, the aspects and preferable examples of this embodiment may be applied to each of other aspects described below. 
     An intraocular lens injector, including: 
     a hollow body having a lens setting portion on which an intraocular lens is set; 
     a plunger that moves through an inside of the hollow body in an axial direction of the hollow body; and 
     a pushing member that pushes out the intraocular lens from the lens setting portion by moving together with the plunger, through the inside of the hollow body, and in the axial direction of the hollow body; and 
     a flange that is provided in the hollow body and can move in an axial direction of the hollow body. 
     The flange in the above aspect may be the only flange in the intraocular lens injector. That is, it may be the only flange before and after the movement of the flange. 
     Still another aspect of the present invention is as follows. 
     An adaptor for intraocular lens injector, including:
         a hollow body having a lens setting portion on which an intraocular lens is set;   a plunger that moves through an inside of the hollow body in an axial direction of the hollow body;   a pushing member that pushes out the intraocular lens from the lens setting portion by moving together with the plunger, through the inside of the hollow body, and in the axial direction of the hollow body; and   a second flange protruded from an outer circumferential surface of the hollow body;       

     wherein the adaptor includes a first flange, 
     the hollow body is configured so that a shape of the first flange on the A direction side toward a center of gravity of the hollow body in which the first flange is arranged from a center of the hollow body, and a shape of the first flange on the A′ direction side which is the opposite direction to the A direction, are non-symmetrical, when viewed from the axial direction after the adaptor is attached to the intraocular lens injector; 
     the second flange is configured to protrude toward at least the A′ direction, when the hollow body is viewed from the axial direction after the adaptor is attached to the intraocular lens injector; and 
     the first flange is configured not to protrude toward the A′ direction, or configured so that a protruding distance of the first flange toward the A′ direction is smaller than a protruding distance of the first flange toward the A direction and smaller than a protruding distance of the second flange toward the A′ direction. The adapter in the above-described aspect may further include an adapter body (suitably semi-cylindrical) and an engagement portion (e.g., an opening) that engages with the flange. 
     Still another aspect of the present invention is as follows. 
     An adaptor for intraocular lens injector, including:
         a hollow body having a lens setting portion on which an intraocular lens is set;   a plunger that moves through an inside of the hollow body in an axial direction of the hollow body; and   a pushing member that pushes out the intraocular lens from the lens setting portion by moving together with the plunger, through the inside of the hollow body, and in the axial direction of the hollow body;       

     wherein the adaptor includes a first flange and a second flange, 
     the hollow body is configured so that a shape of the first flange on the A direction side toward a center of gravity of the hollow body in which the first flange is arranged from a center of the hollow body, and a shape of the first flange on the A′ direction side which is the opposite direction to the A direction, are non-symmetrical, when viewed from the axial direction after the adaptor is attached to the intraocular lens injector; 
     the second flange is configured to protrude toward at least the A′ direction, when the hollow body is viewed from the axial direction after the adaptor is attached to the intraocular lens injector; and 
     the first flange is configured not to protrude toward the A′ direction, or configured so that a protruding distance of the first flange toward the A′ direction is smaller than a protruding distance of the first flange toward the A direction and smaller than a protruding distance of the second flange toward the A′ direction. 
     SUMMARY OF THE INVENTION 
     The present invention provides an intraocular lens injector capable of smoothly performing an operation at the time of injecting an intraocular lens. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         FIG. 1  is a schematic plan view of a conventional intraocular lens injector. 
         FIG. 2  is a schematic side view of a conventional intraocular lens injector when viewed from the left side (Y1 direction). 
         FIG. 3  is a schematic side view of an intraocular lens injector of this embodiment when viewed from the left side (Y1 direction). 
         FIG. 4  is a schematic side view of a usage aspect of the conventional intraocular lens injector. 
         FIG. 5  is a schematic side view of a usage aspect of the intraocular lens injector of this embodiment. 
         FIG. 6  is a schematic front view of the conventional intraocular lens injector when viewed from the axial direction of the hollow body (X1 direction). 
         FIG. 7( a )  is a schematic front view of the intraocular lens injector of this embodiment when viewed from the axial direction of the hollow body (X1 direction).  FIG. 7( b )  and  FIG. 7( c )  are schematic front views of the intraocular lens injector of this embodiment when viewed from the axial direction of the hollow body (X1 direction), in which the first flange is deformed. 
         FIG. 8  is a schematic perspective view of this embodiment applied to the intraocular lens injector described in WO 2018/003854. 
         FIG. 9  is a schematic perspective view of a configuration in which a displayed index is varied according to the movement of the flange  14 ;  FIG. 9( a )  illustrates the configuration before the movement of the flange, and  FIG. 9( b )  illustrates the configuration after movement of the flange. 
         FIG. 10  is a schematic perspective view of an adaptor of the intraocular lens injector of this embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Embodiments of the present invention will be described hereafter, with reference to the drawings. In the present specification, “to” refers to a predetermined value or more and a predetermined value or less. 
     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, 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 tip end 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 X1 direction and X2 direction correspond to a length direction of the intraocular lens injector  1 , and the Y1 direction and Y2 direction correspond to a width direction of the intraocular lens injector, and the Z1 direction and Z2 direction correspond to a height direction of the intraocular lens injector  1 . 
     The main feature portion in this embodiment is the part relating to the flange. Therefore, the intraocular lens injector is depicted as a configuration simplified except for the part relating to the flange. 
     Of course, except for the part relating to the flange, the known configuration of the intraocular lens injector may be adopted. For example, the configuration of WO2018/003854 by the present applicant may be adopted. Unless otherwise described below, a known configuration of an intraocular lens (for example, a configuration of WO 2018/003854) may be adopted, as if fully set forth herein. 
       FIG. 1  is a schematic plan view of the conventional intraocular lens injector  1000 . 
       FIG. 2  is a schematic side view of the conventional intraocular lens injector  1000  when viewed from the left side (Y1 direction). 
     This embodiment is illustrated in  FIG. 3  based on the simplified configuration. 
       FIG. 3  is a schematic side view of the intraocular lens injector  1  of this embodiment when viewed from the left side (Y1 direction). A part of the plunger  9  and the pushing member  10  inside the intraocular lens injector  1  are indicated by a dash-dot-dash line. 
     Note that, in the conventional configuration of  FIG. 1  and  FIG. 2 , a feature is indicated by a numeral of the corresponding feature of this embodiment of  FIG. 3  with “zero” added after the last digit thereof. 
     An intraocular lens injector  1  of this embodiment includes: 
     a hollow body  5  having a lens setting portion  11  on which an intraocular lens  4  is set; 
     plunger  9  that moves through an inside of the hollow body  5  in an axial direction of the hollow body  5 ; 
     pushing member  10  that pushes out the intraocular lens  4  from the lens setting portion  11  by moving together with the plunger  9 , through the inside of the hollow body  5 , and in the axial direction of the hollow body  5 ; 
     first flange  14   a  protruded from an outer circumferential surface of the hollow body  5 ; and 
     second flange  14   b  arranged on a rear end side with respect to the first flange  14   a  and protruded from the outer circumferential surface of the hollow body  5 . 
     The hollow body  5  is a main body of the intraocular lens injector  1 . A lens setting portion  11  is provided at the front part side of the hollow body  5 . The intraocular lens  4  is set on the lens setting portion  11 . 
     The conventional configuration may be adopted for the configuration in the lens setting portion  11  of this embodiment. For example, in the conventional intraocular lens injector  1000 , the intraocular lens  40  is held by the stopper  110   b  when the lid  110   a  of the lens setting portion  110  is opened, as illustrated in  FIG. 1 . At the time of injecting the intraocular lens  40 , the stopper  110   b  is removed. 
     The lens setting portion  11  of this embodiment does not have to be provided with the openable/closable lid  11   a.  The intraocular lens  4  may already be set on the lens setting portion  11  at the shipping stage of the intraocular lens injector  1 . 
     As the rear end  9 ′ of the plunger  9  is pushed, the plunger  9  moves inside the hollow body  5  in the axial direction of the hollow body  5  to push the intraocular lens  4  from the tip end  5   a  (opening of the nozzle) of the hollow body  5 . The plunger  9  is disposed coaxially with the hollow body  5 . The plunger  9  is provided movably in the axial direction of the hollow body  5 . The rear end  9 ′ may have a shape that curves toward the rear end side to make it easier to receive the thumb of the operator (e. g., reference numeral  9 ′ in  FIGS. 4 and 5 ). 
     The pushing member  10  pushes the intraocular lens  4  set on the lens setting portion  11  forward, so that the intraocular lens  4  is released from the tip end  5   a  (opening of the nozzle) of the hollow body  5 . Pushing member  10  is formed in an elongated rod shape. The pushing member  10  is coupled to the tip end part of the plunger  9  and moves integrally with the plunger  9  in the axial direction of the hollow body  5 . The pushing member  10  may be integrally molded with the plunger  9 . 
     One of the main characteristics of the first flange  14   a  is that the shape on the A direction side (Z1 direction side in this embodiment) and the shape on the A′ direction side which is an opposite direction to the A direction (Z2 direction side in this embodiment) are non-symmetrical, when the hollow body  5  is viewed from the axial direction. It is one of the major differences from  FIG. 2 . 
     In view of the foregoing, one of the major characteristics is that the second flange  14   b  is configured to protrude toward at least the A′ direction (toward Z2 direction), when the hollow body  5  is viewed from the axial direction. 
     Moreover, one of the major characteristics is that the first flange  14   a  is configured not to protrude toward the A′ direction (toward Z2 direction) (see, for example,  FIG. 7( a ) , this embodiment adopts mainly this example), or configured so that a protruding distance Ha′ of the first flange  14   a  toward the A′ direction (toward Z2 direction) is smaller than a protruding distance Ha of the first flange  14   a  toward the A direction (toward Z1 direction) and smaller than a protruding distance Hb of the second flange  14   b  toward the A′ direction (toward Z2 direction), as illustrated in  FIG. 7( c )  below. 
     “A direction” refers to the protruding direction of the first flange  14   a.  For example, in  FIGS. 7 and 8  below, the Z1 direction corresponds to the A direction. More specifically, “A direction” refers to the direction from a center O of the hollow body  5  toward a center of gravity G of the hollow body  5  in which the first flange  14   a  is arranged, when viewing the hollow body  5  from the axial direction. The center of gravity G refers to a center of gravity in a configuration including the hollow body  5  and the first flange  14   a  when viewing the hollow body  5  from the axial direction. The center O usually coincides with the center of gravity of the cross section of the hollow body  5  before the first flange  14   a  is provided. 
     The “protruding distance” refers to a value obtained by subtracting the radius (half width) on the outer circumference side of the hollow body  5  from the distance between the first flange  14   a  or second flange  14   b  and the perpendicular line with respect to the A-A′ direction, the perpendicular line passing through the center O of the hollow body  5 , when viewing the hollow body  5  from the axial direction. The value being zero or less (for example, the A′ direction side of the first flange  14   a  in  FIG. 7( b ) ) means that there is no protrusion. 
     The A-A′ direction (Z1-Z2 direction) means the two opposite directions on a straight line passing through an origin which is the center of the hollow body  5  on the YZ plane perpendicular to the axis of the hollow body  5 , that is, the X axis. 
     The shape on the A direction side (Z1 direction side) refers to a shape in the area on the A direction side (upper side) with respect to the perpendicular line (Y1-Y2 direction) which passes through the center O of the hollow body  5  and is perpendicular to the A-A′ direction (Z1-Z2 direction). 
     Similarly, the shape on the A′ direction side (Z2 direction side) refers to a shape in the area on the A′ direction side (lower side) with respect to the perpendicular line (Y1-Y2 direction) which passes through the center O of the hollow body  5  and is perpendicular to the A-A′ direction (Z1-Z2 direction). 
     The first flange  14   a  is configured so as not to protrude toward the A′ direction side (Z2 direction side), or so that the protruding distance of the first flange  14   a  on the A′ direction side (Z2 direction side) is reduced as described above. Therefore, the first flange  14   a  has a non-symmetrical shape with respect to the perpendicular line (Y1-Y2 direction) which passes through the center O of the hollow body  5  and is perpendicular to the A-A′ direction (Z1-Z2 direction). 
     The arrangement relationship and the magnitude relationship between the first flange  14   a  and the second flange  14   b  produce the following effects. 
       FIG. 4  is a schematic side view of a usage aspect of the conventional intraocular lens injector  1000 . 
       FIG. 5  is a schematic side view of a usage aspect of the intraocular lens injector  1  of this embodiment. 
     In the case where an operator uses the conventional intraocular lens injector  1000 , as illustrated in  FIG. 4 , the distance between the flange  140  and the rear end portion  90 ′ of the plunger  90  (the portion pressed by the thumb) is shortened when the plunger  90  is finished being pressed, and the operator feels a large load on his/her fingers. 
     On the other hand, in the case where an operator uses the intraocular lens injector  1  of this embodiment, as for the natural position of the operator&#39;s finger, his/her thumb presses against the plunger  9  while hooking his/her index finger on the first flange  14   a  protruding toward the A direction (Z1 direction) and his/her middle finger on the second flange  14   b  protruding toward the A′ direction (Z2 direction) which is opposed to the A direction (Z1 direction), as illustrated in  FIG. 5 . At that time, the distance between the index finger and the thumb can be secured to be wider than before. This means that even when the plunger  9  is finished being pushed, the distance between the first flange  14   a  (index finger) and the rear end  9 ′ of the plunger  9  (thumb) can be secured. The distance between the index finger on the first flange  14   a  and the plunger  9  is set to be larger than the distance between the middle finger on the second flange  14   b  and the plunger  9 . This makes it easier for the operator to put his/her strength exclusively on his/her index finger, and thus the load on the operator can be reduced. 
       FIG. 6  is a schematic front view of the conventional intraocular lens injector  1000  when viewed from the axial direction of the hollow body  5  (X1 direction). 
       FIG. 7( a )  is a schematic front view of the intraocular lens injector  1  of this embodiment when viewed from the axial direction of the hollow body  5  (X1 direction).  FIG. 7( b )  and  FIG. 7( c )  are schematic front views of the intraocular lens injector  1  of this embodiment when viewed from the axial direction of the hollow body  5  (X1 direction), in which the first flange  14   a  is deformed. 
     As illustrated in  FIG. 6 , as for the arrangement, the conventional flange  140  is provided protruding in an annular shape at the rear end of the hollow body  50 . When the intraocular lens injector  1000  is viewed from the X1 direction, the flange  140  has a vertically symmetrical structure. 
     In contrast, the first flange  14   a  of this embodiment has a non-symmetrical structure (a structure in which the first flange  14   a  exists only on the upper side). Since the first flange  14   a  exists only on the upper side, the middle finger on the lower second flange  14   b  does not interfere with the first flange  14   a.  It greatly improves the operability of the operator. 
     Incidentally, the structure of the first flange  14   a  of this embodiment is, in other words, a structure that “is protruded from the outer circumferential surface of the hollow body  5  in the A direction of two directions, the A direction and the A′ direction, that are opposite to each other”. As illustrated in  FIG. 7( a ) , this structure includes a structure that does not protrude in the right-left direction but only in the upward direction when the intraocular lens injector  1  is viewed from the axial direction of the hollow body  5  (the second flange  14   b  is indicated by dashed line). Also contemplated is the structure that protrudes in the right-left direction in addition to the upward direction, as illustrated in  FIG. 7( b ) , when the intraocular lens injector  1  is viewed from the axial direction of the hollow body  5 . Also contemplated is the structure having two or more protrusions as illustrated in  FIG. 7( c ) . 
     In the first flange  14   a  which also protrudes toward the A′ direction as illustrated in  FIG. 7( c ) , when the protruding distance Ha′ is smaller than the protruding distance Ha of the first flange  14   a  toward the A direction and smaller than the protruding distance Hb of the second flange  14   b  toward the A′ direction, the middle finger on the lower second flange  14   b  does not interfere with the first flange  14   a  compared to those described in Patent Document 1. 
     In this case, the specific protruding distance Ha′ of the first flange  14   a  toward the A′ direction may be such that the middle finger does not interfere when the operator puts his/her middle finger on the second flange  14   b.  The distance may be, for example, less than 5 mm. 
     A second flange  14   b  protruding toward at least the A′ direction (Z2 direction) is provided behind the first flange  14   a.  This is a major difference from the flange  140  of the conventional intraocular lens injector  1000 . 
     In view of the foregoing, the intraocular lens injector  1  with the above configuration reduces the load on the operator&#39;s fingers, stabilizes the operation, and smoothly performs an operation at the time of injecting an intraocular lens  4 . 
     The second flange  14   b  of this embodiment is provided as a distinct body, separated from the first flange  14   a.  The second flange  14   b  may protrude not only toward the A′ direction (Z2 direction) but also toward the A direction (Z1 direction), or, like a conventional one, it may have a circular shape when viewed in the axial direction. In other words, the second flange  14   b  may have a conventional vertically symmetrical structure. In the following  FIG. 8 , the above description is reflected in a known intraocular lens injector  1 . 
       FIG. 8  is a schematic perspective view of this embodiment applied to the intraocular lens injector  1000  described in WO 2018/003854. 
     In  FIG. 8 , the same numeral as that in the present specification indicates one having the same configuration. The numerals described herein are as described in WO2018/003854. 
     The separation distance L between the first flange  14   a  and the second flange  14   b  in the axial direction of the hollow body  5  may be 10 to 60 mm, and is preferably 10 to 35 mm. With the distance being 10 mm or more, even when the plunger  9  is finished being pushed, the distance between the first flange  14   a  (index finger) and the rear end  9 ′ of the plunger  9  (thumb) can be sufficiently secured. With the distance being 35 mm or less, the distance between the operator&#39;s index finger and thumb can be extended without difficulty. 
     Furthermore, as for arrangement in the X1-X2 direction, the first flange  14   a  is preferably arranged closer to the second flange compared to the midpoint of the distance between the tip end  5   a  of the hollow body  5  and the second flange  14   b.    
     The separation distance L may be the distance in the X1-X2 direction when the operator puts his/her index finger on the first flange  14   a  and middle finger on the second flange  14   b.  By way of example of the definition of the separation distance L, it may be a distance between the protruding portion of the first flange  14   a  and the protruding portion of the second flange  14   b  on the outer circumference of the hollow body  5  in the axial direction of the hollow body  5 , or may be the shortest distance between the first flange  14   a  and the second flange  14   b.    
     The protruding distances Ha and Hb of the first flange  14   a  (toward the A direction (toward the Z1 direction)) and the second flange  14   b  (toward the A′ direction (toward the Z2 direction)) in the vertical direction to the axial direction of the hollow body  5  are preferably 10 mm or more. With the distance being 10 mm or more, the operator&#39;s fingers are sufficiently caught on the first flange  14   a  and the second flange  14   b,  so that the operability can be further improved. The distance is preferably 15 mm or more. There is no particular limitation on the upper limit of the protruding distances Ha and Hb. However, with the protruding distances Ha and Hb being 20 mm or less, the operative field during the surgical procedure can be secured to be sufficiently wide, and the operator can visually recognize how the intraocular lens  4  is injected into the eye without hindrance. 
     In the case where the protruding distances Ha and Hb of the first flange  14   a  (toward the A direction (toward the Z1 direction)) and the second flange  14   b  (toward the A′ direction (toward the Z2 direction)) in the vertical direction to the axial direction of the hollow body  5  are 10 mm or more, there is no limitation on the direction and shape of the protrusion, as long as it is protruded from the outer circumferential surface of the hollow body  5  when viewing the hollow body  5  from the axial direction. For example, even when protruding toward the front or toward the rear, the first flange  14   a  appears to protrude in the A direction (Z1 direction) when viewing the hollow body  5  from the axial direction. The above-described protruding distances Ha and Hb are determined based on this appearance. 
     The protruding distances Ha and Hb of the first flange  14   a  (toward the A direction (toward the Z1 direction)) and the second flange  14   b  (toward the A′ direction (toward the Z2 direction)) may be the same or different from each other. When they are different, it is preferable that the protruding distance Ha of the first flange  14   a  (toward the A direction (toward the Z1 direction)) is 50% or more (preferably 60% or more, more preferably 60 to 140%, and still more preferably 80 to 120%) based on the protruding distance Hb of the second flange  14   b  (toward the A′ direction (toward the Z2 direction)). 
     The lens setting portion  11  is arranged on the tip end side with respect to the first flange  14   a,  and then the lens setting portion  11  is preferably arranged in the A direction (Z1 direction), when the hollow body  5  is viewed from the axial direction. More specifically, when the hollow body  5  is cross-sectionally viewed with respect to the YZ plane, the lid  11   a  of the lens setting portion  11  (or inlet for hyaluronic acid, a window for monitoring the intraocular lens  4 , etc.) is preferably provided on the outer circumference of the hollow body  5  in the A direction (Z1 direction). Namely, it is preferable that the direction in which the lens setting portion  11  is arranged, that is, the direction in which the optical surface of the intraocular lens  4  faces upward is same as the direction in which the first flange  14   a  protrudes. 
     When the operator grasps the intraocular lens injector  1  of this configuration, the lens setting portion  11  is naturally in the upper position as illustrated in  FIG. 5 . When the operator injects the intraocular lens  4  into the patient&#39;s eye, the operator naturally puts his/her index finger on the first flange  14   a  and middle finger on the second flange  14   b.  Therefore, the operator can observe the intraocular lens  4  being pushed out of the lens setting portion  11  while taking a natural posture. 
     It is preferable that at least one of the first flange  14   a  and the second flange  14   b  has a configuration movable in the axial direction of the hollow body  5 . A shorter distance between the tip end  5   a  of the hollow body  5 , that is, the opening of the nozzle through which the intraocular lens  4  is pushed out, and the first flange  14   a  may allow some operators to more smoothly perform an operation at the time of injecting the intraocular lens  4 . With the above configuration, it is possible to meet this type of request tailored to a particular operator. 
     Alternatively, both of the first flange  14   a  and the second flange  14   b  may have a configuration movable in the axial direction of the hollow body  5 . A “configuration movable” means a configuration that can be movable in the axial direction, and fixed in an arbitrary position after movement. With this configuration, even when the plunger  9  is finished being pushed while the distance between the first flange  14   a  and the second flange  14   b  is kept constant, the distance between the first flange  14   a  (index finger) and the rear end  9 ′ of the plunger  9  (thumb) can be secured. Then, the distance between the tip end  5   a  of the hollow body  5  and the first flange  14   a  can be shortened, as requested by the operator. As a result, an operation at the time of injecting an intraocular lens  4  can be performed very smoothly. 
     Alternatively, only the second flange  14   b  may have a configuration movable in the axial direction of the hollow body  5 . With this configuration, the distance between the first flange  14   a  and the second flange  14   b  can be varied, tailored to the operator. 
     As the specific configuration movable in the axial direction of the hollow body  5 , for example, a configuration may be adopted, in which at least one of the first flange  14   a  and the second flange  14   b  may be rotated about the axial direction of the hollow body  5  as a central axis, so as to be moved forward and backward. Alternatively, at least one of the first flange  14   a  and the second flange  14   b  may be pushed in the axial direction of the hollow body  5  so as to be moved. A notch or the like for locking at least one of the first flange  14   a  and the second flange  14   b  may be provided at a predetermined position in the axial direction of the hollow body  5 . 
     It is preferable that the hollow body  5  is provided with index N according to the arrangement of at least one of the first flange  14   a  and the second flange  14   b.  It is preferable that the displayed index N is varied according to the movement of at least one of the first flange  14   a  and the second flange  14   b.    
     The type of the index N is not particularly limited, and may be a numerical value indicating the size of a hand (glove size). When the index N is the glove size, the operator can grasp at a glance which glove size corresponds to at least one of the positions of the first flange  14   a  and the second flange  14   b.  As a result, the arrangement of the first flange  14   a  and the second flange  14   b  suitable for the operator can be attained at the time of injecting the intraocular lens  4 , and the operation for injecting the intraocular lens  4  can be performed very smoothly. 
     The technical scope of the present invention is not limited to the embodiment described above but includes modes to which various modifications or improvements are made to the extent of deriving the specific effects obtained by the constituent features of the invention and combinations thereof. 
     For example, the intraocular lens injector of this embodiment may be, for example, a disposable type made of resin, or it may be a repeatedly usable type. However, the disposable type is preferable because it does not need to be cleaned and disinfected each time, which saves time and effort. 
     (Flange Movable in Axial Direction) 
     In this embodiment, a configuration with at least one of the first flange  14   a  and the second flange  14   b  having a configuration movable in the axial direction of the hollow body  5  has been described as a preferable example. 
     On the other hand, a vertically symmetrical flange  140  provided on the hollow body  50  of the conventional intraocular lens injector  1000 , which is made movable in the axial direction of the hollow body  50 , may be used in this embodiment. 
     In such a case, the distance between the tip end  5   a  of the hollow body  5  and the first flange  14   a  can be varied, tailored to the operator. This configuration can also be used to solve the problem to provide an intraocular lens injector  1  capable of smoothly performing an operation at the time of injecting an intraocular lens  4 . Therefore, this configuration can be an invention by itself. Such a configuration is as follows. 
     An intraocular lens injector  1 , including:
         a hollow body  5  having a lens setting portion  11  on which an intraocular lens  4  is set;   plunger  9  that moves through an inside of the hollow body  5  in an axial direction of the hollow body  5 ;   pushing member  10  that pushes out the intraocular lens  4  from the lens setting portion  11  by moving together with the plunger  9 , through the inside of the hollow body, and in the axial direction of the hollow body  5 ; and   flange  14  that is provided in the hollow body  5  and can move in an axial direction of the hollow body  5 .       

       FIG. 9( a )  is a schematic perspective view illustrating that the index N is configured to be varied according to the arrangement of the flange  14 , before movement of the flange  14 .  FIG. 9( b )  is a diagram after movement of the flange  14 . 
     As illustrated in  FIG. 9 , when the index N is the glove size, the operator can grasp at a glance which glove size corresponds to the positions of the flange  14 . As a result, the arrangement of the flange  14  suitable for the operator can be attained at the time of injecting the intraocular lens  4 , and the operation for injecting the intraocular lens  4  can be performed very smoothly. 
     The flange  14  in the above-described configuration may be the only flange  14  in the intraocular lens injector  1 . That is, it may be the only flange  14  before and after the movement of the flange  14 . Alternatively, like the conventional flange  14 , the flange  14  may be protruded from the outer circumference of the hollow body  5  so that the intraocular lens injector  1  is vertically symmetrical when viewed from the lateral direction. 
     (First Flange  14   a  Diverted as Adaptor) 
     The first flange  14   a  may be produced by integrally molding with the hollow body  5 , or may be prepared as an adaptor  17  separated from the hollow body  5 . For example, the adaptor  17  may be fixed to flange  140  of the conventional intraocular lens injector  1000 , the flange  140  protruding in an annular shape when viewed from the axial direction of the hollow body  50 . 
       FIG. 10  is a schematic perspective view illustrating an adaptor  17  for an intraocular lens injector  1  of this embodiment. 
     By adopting this configuration, the effect of this embodiment can be enjoyed by engaging the adaptor  17  with the conventional intraocular lens injector  1000 . 
     There is no particular limitation on this adaptor  17  as long as it is provided with the first flange  14   a.  Such a configuration is as follows. 
     An adaptor  17  for intraocular lens injector  1 , including:
         a hollow body  5  having a lens setting portion  11  on which an intraocular lens  4  is set;   plunger  9  that moves through an inside of the hollow body  5  in an axial direction of the hollow body  5 ;   pushing member  10  that pushes out the intraocular lens  4  from the lens setting portion  11  by moving together with the plunger  9 , through the inside of the hollow body, and in the axial direction of the hollow body  5 ; and   second flange  14   b  protruded from an outer circumferential surface of the hollow body  5  (or the conventional flange  140 );       

     wherein the adaptor  17  includes first flange  14   a,    
     when viewing the hollow body  5  from the axial direction after the adaptor  17  is attached to the intraocular lens injector  1 , 
     the hollow body is configured so that a shape of the first flange  14   a  on the A direction side toward a center of gravity G of the hollow body  5  in which the first flange  14   a  is arranged from a center O of the hollow body  5 , and a shape of the first flange  14   a  on the A′ direction side which is the opposite direction to the A direction, are non-symmetrical, and 
     the second flange  14   b  is configured to protrude toward at least the A′ direction, and 
     the first flange  14   a  is configured not to protrude toward the A′ direction, or configured so that a protruding distance Ha′ of the first flange  14   a  toward the A′ direction is smaller than a protruding distance Ha of the first flange  14   a  toward the A direction and smaller than a protruding distance Hb of the second flange  14   b  toward the A′ direction. 
     Specific configurations of the adaptor  17  are as follows. For example, an adaptor body  18  is prepared having a semi-cylindrical shape which is a shape following the outer circumference of the hollow body  5 . The first flange  14   a  is formed which is protruded from a semi-cylindrical outer circumferential surface of the adaptor body  18 . A portion of the adaptor body  18 , which is to be the rear end of the adaptor  17  when it is attached to the hollow body  5 , is then provided with a configuration that can engage with the flange  140  of the conventional intraocular lens injector  1000 . 
     There is no limitation on such an engageable aspect. For example, an opening  18   a  is provided in the adaptor body  18  behind the first flange  14   a , and the adaptor  17  is fixed by putting the conventional flange  140  through the opening  18   a  upwardly from below. In that case, since the opening  18   a  can fix the conventional flange  140 , the shape of the adaptor body  18  is not necessarily semi-cylindrical. 
     On the other hand, instead of or in addition to the flange  140  of the conventional intraocular lens injector  1000 , the adaptor body  18  may be engaged with the outer circumference of the hollow body  5 . 
     Another engageable aspect is to provide a distinct clip-shaped protrusion on the adaptor body  18  that is separated from the first flange  14   a , the distinct protrusion locking the conventional flange  140  like a clip. 
     In order to reflect a suitable example of the separation distance L between the first flange  14   a  and the second flange  14   b  in this embodiment, the separation distance L between the opening  18   a  in the adaptor body  18  and the first flange  14   a  is preferably from 10 to 60 mm (more suitably from 10 to 35 mm). In the case of an aspect other than the opening  18   a,  when the adaptor  17  is attached to the intraocular lens injector  1 , the adaptor  17  preferably has a configuration in which the separation distance L between the first flange  14   a  and the second flange  14   b  is 10 to 35 mm. Incidentally, the protruding distance Ha is preferably 10 to 20 mm, as in this embodiment. 
     Further, a configuration with at least one of the first flange  14   a  and the second flange  14   b  movable in the axial direction of the hollow body  5 , as described in this embodiment, may be adopted for the above-described adaptor  17 . 
     (First Flange  14   a  and Second Flange  14   b  Diverted as Adaptor) 
     The first flange  14   a  and the second flange  14   b  may be integrated, and then prepared as an adaptor  17  which is a distinct body separated from the hollow body  5 . Such a configuration is as follows. 
     An adaptor  17  for intraocular lens injector  1 , including: 
     a hollow body  5  having a lens setting portion  11  on which an intraocular lens  4  is set; 
     plunger  9  that moves through an inside of the hollow body  5  in an axial direction of the hollow body  5 ; 
     pushing member  10  that pushes out the intraocular lens  4  from the lens setting portion  11  by moving together with the plunger  9 , through the inside of the hollow body, and in the axial direction of the hollow body  5 ; 
     wherein the adaptor  17  includes a first flange  14   a  and a second flange  14   b,    
     when viewing the hollow body  5  from the axial direction after the adaptor  17  is attached to the intraocular lens injector  1 , 
     the hollow body is configured so that a shape of the first flange  14   a  on the A direction side toward a center of gravity G of the hollow body  5  in which the first flange  14   a  is arranged from a center O of the hollow body  5 , and a shape of the first flange  14   a  on the A′ direction side which is the opposite direction to the A direction, are non-symmetrical, and 
     the second flange  14   b  is configured to protrude toward at least the A′ direction, and 
     the first flange  14   a  is configured not to protrude toward the A′ direction, or configured so that a protruding distance Ha′ of the first flange  14   a  toward the A′ direction is smaller than a protruding distance Ha of the first flange  14   a  toward the A direction and smaller than a protruding distance Hb of the second flange  14   b  toward the A′ direction. 
     In this case, in addition to the first flange  14   a,  the second flange  14   b  is formed so as to be arranged on a rear end side with respect to the first flange  14   a  and protruded from the outer circumferential surface of the adaptor  18 . In that case, the second flange  14   b  is made to protrude in a direction (A′ direction) opposite to the protruding direction (A direction) of the first flange  14   a.  In this connection, the adaptor body  18  preferably is elastic and has an approximately C-shape, that is, a part of the cylinder being cut out in the longitudinal direction. With this shape, the hollow body  5  can be fit into the adaptor body  18  to fix the adaptor  17 . 
     When this adaptor  17  is attached to the hollow body  5 , the substantially C-shaped opening  18   a  is oriented in the right-left direction (horizontal direction). As a result, the first flange  14   a  can protrude upward from the outer circumferential surface on the tip end side of the adaptor  17 , and the second flange  14   b  can protrude downward from the outer circumferential surface of the rear end side with respect to the first flange  14   a.    
     DESCRIPTION OF SIGNS AND NUMERALS 
       1  Intraocular lens injector 
       4  Intraocular lens 
       5  Hollow body 
       5   a  Tip end (of hollow body) 
       9  Plunger 
       9 ′ Rear end (of plunger) 
       10  Pushing member 
       11  Lens setting portion 
       11   a  Lid (of lens setting portion) 
       14   a  First flange 
       14   b  Second flange 
       14  Flange 
       17  Adaptor for intraocular lens injector 
       18  Adaptor body 
       18   a  Opening 
       110   b  Stopper