Patent Publication Number: US-6712848-B1

Title: Deformable intraocular lens injecting apparatus with transverse hinged lens cartridge

Description:
RELATED APPLICATIONS 
     This application is a continuation of application Ser. No. 08/691,491, filed Aug. 2, 1996, now U.S. Pat. No. 5,928,295; and a Continuation-In-Part (CIP) of: 
     1) U.S. patent application entitled “Apparatus and Method for Preparing an Intraocular Lens for Insertion”, Ser. No. 08/649,433, filed May 17, 1996; now abandoned; 
     2) U.S. patent application entitled “Deformable Intraocular Lens Injecting Apparatus with Deformable Tip Plunger”, Ser. No. 08/570,564, filed Dec. 11, 1995; now U.S. Pat. No. 5,772,666; 
     3) U.S. patent application entitled “Transverse Hinged Deformable Intraocular Lens Injecting Apparatus”, Ser. No. 08/547,908, filed Oct. 25, 1995; now U.S. Pat. No. 5,616,148; 
     4) U.S. patent application entitled “Transverse Hinged Deformable Intraocular Lens Injecting Apparatus”, Ser. No. 08/547,295, filed Oct. 25, 1995; now U.S. Pat. No. 5,620,450; 
     5) U.S. patent application entitled “Deformable Intraocular Lens Injection System, and Method Thereof”, Ser. No. 08/449,103, filed May 24, 1995; now abandoned; 
     6) U.S. patent application entitled “Deformable Intraocular Lens Injecting Device, Ser. No. 08/403,530, filed Mar. 14, 1995; now abandoned; 
     7) U.S. patent application entitled “Deformable Intraocular Lens Insertion System”, Ser. No. 08/401,523, filed Mar. 10, 1995; now U.S. Pat. No. 5,807,400; 
     8) U.S. patent application entitled “Deformable Intraocular Lens Injection Systems and Methods of Use Thereof”, Ser. No. 08/368,792, filed Jan. 4, 1995; now pending; 
     9) U.S. patent application entitled “Disposable Intraocular Lens Insertion System, Ser. No. 08/345,360, filed Nov. 18, 1994; now abandoned; 
     10) U.S. patent application entitled “Intraocular Lens Insertion System”, Ser. No. 08/240,520, filed Jul. 19, 1994; now abandoned; 
     11) U.S. patent application entitled “Hingeless Cartridge for Insertion of a Deformable Intraocular Lens”, Ser. No. 08/196,855, filed Feb. 15, 1994; U.S. Pat. No. 5,941,886; 
     12) U.S. patent application entitled “Methods of Implantation of a Deformable Intraocular Lens, Ser. No. 08/195,717, filed Feb. 14, 1994; now abandoned; and 
     13) U.S. patent application entitled “Intraocular Lens Insertion System”, Ser. No. 07/953,251, filed Sep. 30, 1992, now abandoned, all fully incorporated herein by reference. 
    
    
     FIELD OF THE INVENTION 
     This invention is directed to a deformable intraocular lens injecting apparatus including a transverse hinged closure for loading the deformable intraocular lens into a lens delivery passageway of the lens injecting apparatus. In a preferred embodiment, the lens injecting apparatus includes a lens cartridge having a transverse hinged configured to open and close for loading the deformable intraocular lens into a lens delivery passageway of the lens cartridge. 
     BACKGROUND OF THE INVENTION 
     The present invention is directed to surgical apparatus for the implantation of a deformable intraocular lens into the eye. STAAR Surgical Company of Monrovia, California developed the concept of using a “shooter” type device for implanting a deformable intraocular lens into the eye, and supplied such devices in the United States beginning around 1986. 
     The STAAR “shooter” apparatus includes a separate lens injecting device and a separate one-piece hinged cartridge (i.e. a lens holding portion connected to a nozzle portion) that can be assembled together for operation. The hinged cartridge opens along a longitudinal axis to allow a deformable intraocular lens to be loaded in a flat configuration in the two open halves of the lens delivery passageway. When the lens cartridge is closed, a lens delivery passageway is defined therein and the deformable intraocular lens is folded about its center into a curved folded configuration inside the lens delivery passageway. The loaded lens cartridge is then assembled with the lens injecting device which includes a lens cartridge receiver and a movable plunger for forcing the deformable intraocular lens along the lens delivery passageway into the eye. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide an improved deformable intraocular lens injecting apparatus. 
     A second object of the present invention is to provide an improved deformable intraocular lens injecting apparatus including an improved lens cartridge. 
     A third object of the present invention is to provide a lens cartridge which is easy to load with a deformable intraocular lens. 
     A fourth object of the present invention is to provide a deformable intraocular lens injecting apparatus including a transverse hinged lens cartridge configured to open and close for loading the deformable intraocular lens into the lens cartridge. 
     A fifth object of the present invention is to provide a deformable intraocular lens injecting apparatus including a hinged lens cartridge and a lens injecting device including a lens cartridge receiver and a movable plunger. 
     A sixth object of the present invention is to provide a deformable intraocular injecting apparatus including a lens cartridge having a lens holding portion connected to a nozzle portion, the lens holding portion including wall portions connected together by a transverse hinge and configured to be opened and closed for loading a deformable intraocular lens into the lens cartridge. 
     A seventh object of the present invention is to provide a deformable intraocular lens injecting apparatus including a lens cartridge having a lens holding portion connected to a nozzle portion, the lens holding portion including a movable wall portion connected to a stationary wall portion by a transverse hinge. 
     A eighth object of the present invention is to provide a deformable intraocular lens injecting apparatus including a lens cartridge having a lens holding portion connected to a nozzle portion, the lens holding portion including a movable wall portion connected to a stationary wall portion by a transverse hinge, and the movable wall portion including a protrusion extending inwardly into the lens delivery passageway for folding the deformable to intraocular lens into the lens delivery passageway when closing the movable wall portion. 
     The present invention is directed to a lens injecting apparatus for implanting a deformable intraocular lens into the eye. The lens injecting apparatus is provided with a lens delivery passageway therethrough accessible by means of a transverse hinged closure. 
     In one preferred embodiment, the lens injecting apparatus is a one (1) piece or component arrangement (i.e. no lens cartridge). For example, the lens injecting apparatus comprises a housing with an injecting tip and a passageway provided therethrough, a movable plunger disposed within said housing, and a transverse hinged closure along the side of the housing to allow a deformable intraocular lens to be loaded through an opening or window through the side of the housing into the lens delivery passageway when the transverse hinged closure is opened, and seal the opening or window when the transverse hinged closure is closed. 
     In another preferred embodiment, the lens injecting apparatus is a two (2) piece or component arrangement, including 1) a lens injecting device including a lens cartridge receiver; and 2) a lens cartridge. For example, the lens injecting device comprises a housing, a lens cartridge receiver provided at one end of the housing, and a movable plunger disposed in the housing. The lens cartridge, for example, is a one (1) piece or component arrangement including a lens holding portion having a transverse hinged closure connected to a nozzle portion. Once a deformable intraocular lens is loaded into the lens cartridge, the lens cartridge is then loaded into the lens cartridge receiver of the lens injecting device. 
     The transverse hinged closure arrangement utilized in the lens injecting apparatus according to the present invention orients the hinge transverse relative to the orientation of the lens delivery passageway. Specifically, the axis of the hinge is not parallel with the longitudinal axis of the lens delivery passageway. Preferably, the axis of the hinge is set at forty-five (45) to ninety (90) degrees relative to the longitudinal axis of the lens delivery passageway. An angle of ninety (90) degrees is most preferred, especially in embodiments where the transverse hinged closure is utilized for folding the deformable intraocular lens into the lens delivery passageway so that the portion of the transverse hinged closure contacting and forcing the deformable intraocular lens into the lens delivery passageway is aligned with the lens delivery passageway. 
     In a preferred embodiment, the lens delivery passageway is linear, however, curvilinear arrangements can be utilized. Further, the lens delivery passageway may be contoured (e.g. include one or more grooves) for further folding the deformable intraocular lens as it is moved along or through the lens delivery passageway. In addition, the lens delivery passageway may taper inwardly in a direction of advancement of the deformable intraocular lens through the lens delivery passageway. 
     Preferably, the transverse hinged closure is configured to substantially seal the lens delivery passageway when closed to prevent the deformable intraocular lens from escaping when the deformable intraocular lens is being forced through the lens delivery passageway. 
     In some embodiments, the transverse hinged closure provides little or none compressive force on the deformable intraocular lens loaded into the lens delivery passageway when the transverse hinged closure is fully closed. In other embodiments, the transverse hinged closure purposely provides compressive forces on the deformable intraocular lens loaded into the lens delivery passageway when the transverse hinged closure is fully closed. 
     In other embodiments, the transverse hinged closure does not seal the lens delivery passageway, but instead is used to fold the lens into the lens delivery passageway when the transverse hinged closure is being closed. If the deformable intraocular lens is sufficiently folded and captured inside the lens delivery passageway, the deformable intraocular lens can be advanced past the location of the transverse hinged closure, for example by the plunger tip, to a forward portion of the lens injecting apparatus. The forward portion of the lens injecting apparatus can have a completely closed lens delivery passageway portion having an inwardly tapering or lens folding configuration providing radially inwardly directed compressive forces to be exerted onto the deformable intraocular lens by the inner walls of the lens delivery passageway as the deformable intraocular lens is being advanced therethrough. 
     The transverse hinged closure is preferably arranged to stay closed when shut, and more preferably positively locks when shut (e.g. releasably locks to allow reopening for inspection of lens or reuse of lens injecting apparatus, or permanently locks preventing reopening and reuse). In some preferred embodiments, the inner surface of the transverse hinged closure serves as an inner wall of the lens delivery passageway, preferably contiguous with remaining inner wall portions of the lens injecting apparatus. Further, the inner surface of the transverse hinged closure can be contoured (e.g. provided with at least one groove, protrusion, or complex contoured surface design) to facilitate folding of the deformable intraocular lens when closing the transverse hinged closure and/or when advancing the deformable intraocular lens through the lens delivery passageway. 
     In the preferred two (2) piece or component arrangement, the transverse hinged lens cartridge is held closed once inserted into the lens receiver of the lens injecting device. For example, a cylindrical portion of the housing of the lens injecting device serves as a lens cartridge receiver, and the band strength of the cylindrical portion maintains the transverse hinged lens cartridge closed when the lens cartridge is inserted into the lens cartridge receiver. 
     In one preferred embodiment, the transverse hinged closure includes a protrusion for forcing the center of the deformable intraocular lens downwardly while the ends of the lens are held by sides of an opening through the side of the housing to cause the deformable intraocular lens to fold into the lens delivery passageway as the transverse hinged closure is being closed. 
     In another preferred embodiment, the deformable intraocular lens injecting apparatus includes a lens injecting device and a lens cartridge receiver. The lens cartridge of the present invention has a lens holding portion connected to a nozzle portion. Together, the lens holding portion and the nozzle portion define a lens delivery passageway, through which a deformable intraocular lens is introduced to the capsule of the eye. The longitudinal axis of the lens cartridge is substantially parallel to the lens delivery passageway. 
     The lens holding portion of the lens cartridge of the present invention includes a movable wall portion which is movably connected to a stationary wall portion. The movable wall portion moves about an axis which is not parallel to the longitudinal axis of the lens cartridge. In the most preferred embodiment of the present invention, the movable wall portion swings about a transverse hinge which connects the movable wall portion to the stationary wall portion. The transverse hinge is configured in the most preferred embodiment so that there exists a plane normal to the axis of the transverse hinge which contains the longitudinal axis of the lens cartridge. 
     The lens cartridge of the present invention also includes means for releasably locking the lens cartridge in the lens injecting device. In the most preferred embodiment of the present invention, an extension is included on the lens holding portion of the lens cartridge. The extension engages an L-shaped slot in the lens injecting device to releasably lock the lens cartridge therein. 
     In use, the stationary wall portion of the lens cartridge is grasped in a first hand of the user. With a second hand, the user opens the lens cartridge by pushing the movable wall portion about the transverse hinge to expose a substantial portion of the lens delivery passageway of the lens cartridge. While the lens cartridge is in an open configuration, a deformable intraocular lens is placed on the exposed lens delivery passageway. The user then closes the movable wall portion to complete the loading of the lens in the lens cartridge. The lens cartridge is then ready for assembly with the lens injecting device. Grasping the lens cartridge in the first hand and the lens injecting device in the second hand, the extension of the lens cartridge is aligned with the L-shaped slot in the lens injecting device. The lens cartridge is then guided into slot in the lens injecting device to releasably lock the lens cartridge therein. 
     Thus, the user of the lens injecting apparatus of the present invention may more easily load a deformable intraocular lens into the lens cartridge. Further, the user may more easily assemble the lens cartridge with the lens injecting device. In short, the deformable intraocular lens implantation procedure is improved. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a deformable intraocular lens injecting apparatus according to the present invention. 
     FIG. 2A is a side elevational view of a first preferred embodiment of a lens cartridge according to the present invention in a closed configuration. 
     FIG. 2B is a cross-sectional view of at the lens cartridge shown in FIG.  2 A. 
     FIG. 3A is a side elevational view of the lens cartridge shown in FIG. 2A in an open configuration. 
     FIG. 3B is a rear end elevational view of the lens cartridge shown in FIG.  3 A. 
     FIG. 4 is a cross-sectional view of the lens cartridge as indicated in FIG. 2A loaded with a partially folded deformable intraocular lens. 
     FIG. 5 is a longitudinal cross-sectional view of the lens injecting apparatus shown in FIG.  1 . 
     FIG. 6 is a longitudinal cross-sectional view of the lens cartridge shown in FIGS. 2A and 2B. 
     FIG. 7 is a longitudinal cross-sectional view of a second preferred embodiment of the lens cartridge according to the present invention. 
     FIG. 8 is a longitudinal cross-sectional view of a third preferred embodiment of the lens cartridge according to the present invention. 
     FIG. 9A is a transverse cross-sectional view of the lens cartridge, as indicated in FIG.  8 . 
     FIG. 9B is a transverse cross-sectional view of the lens cartridge, as indicated in FIG.  8 . 
     FIG. 9C is a transverse cross-sectional view of the lens cartridge, as indicated in FIG.  8 . 
     FIG. 9D is a transverse cross-sectional view of the lens cartridge, as indicated in FIG.  8 . 
     FIG. 10 is a longitudinal cross-sectional view of a fourth preferred embodiment of the lens cartridge according to the present invention. 
     FIG. 11 is a transverse cross-sectional view of the lens cartridge, as indicated in FIG.  10 . 
     FIG. 12 is a longitudinal cross-sectional view of a fifth preferred embodiment of the lens cartridge according to the present invention. 
     FIG. 13 is a transverse cross-sectional view of the lens cartridge, as indicated in FIG.  12 . 
     FIG. 14 is a rear end elevational view of the lens cartridge shown in FIG. 12 with a deformable intraocular lens in a flat configuration ready to be loaded into the lens cartridge. 
     FIG. 15 is a rear end elevational view of the lens cartridge shown in FIG. 12 with a deformable intraocular lens in a partially folded configuration partially loaded into the lens cartridge. 
     FIG. 16 is a side longitudinal cross-sectional view of a sixth preferred lens cartridge according to the present invention. 
     FIG. 17 is a transverse cross-sectional view of the lens cartridge, as indicated in FIG.  16 . 
     FIG. 18 is a side elevational view of a seventh preferred embodiment of the lens cartridge according to the present invention in a closed configuration. 
     FIG. 19 is a side elevational view of the seventh preferred embodiment of the lens cartridge according to the present invention in an open configuration. 
     FIG. 20 is a further embodiment of the lens cartridge of the present invention showing the positioning of a lens prior to loading the cartridge. 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     A preferred deformable intraocular lens injecting apparatus  10  according to the present invention is shown in FIGS. 1 to  6 . 
     The lens injecting apparatus  10  comprises two (2) separate main components including 1) a lens injecting device  12 ; and 2) a lens cartridge  14 . The lens injecting apparatus  10  is shown fully assembled in FIG. 1 with the lens cartridge  14  connected to the lens injecting device  12 . 
     The lens injecting device  12  comprises a lens cartridge receiver  16  for receiving the lens cartridge  14  when assembled, and a movable plunger  18  for forcing a deformable intraocular lens through the lens cartridge  14  into the eye during the implantation operation. 
     The lens injecting apparatus comprises a tubular body  20  slidably accommodating the movable plunger  18 . The tubular body  20  is provided with a cone-shaped portion  22  defining the lens cartridge receiver  16 . Specifically, the cone-shaped portion  22  is provided with a cylindrical round hole in the end thereof defining a cylindrical-shaped sleeve for accommodating a portion of the lens cartridge  14 . The cone-shaped portion  22  is also provided with a longitudinal slot  24  extending into a transverse slot  26  defining a “bayonet” type connection between the lens cartridge  14  and the lens injecting device  12 . 
     The lens injecting device  12  is also provided with a finger grip  28  allowing a user to grip the lens injecting device  12  between the fore finger and middle finger, and the plunger  18  is provided with a thumb grip  30 . The plunger  18  is provided with a spring  31  (FIG. 5) located inside the tubular body  30  and mounted on the plunger  18  of the lens injecting device  12  so that a user pushes the plunger  18  forward against an opposite spring force provided by the spring  31  when gripping the finger grip  28  with the fore finger and middle finger and pressing the thumb grip  30  with the user&#39;s thumb. 
     A first preferred lens cartridge  14  is shown in the closed configuration in FIGS. 2A and 2B and in the open configuration in FIGS. 3A and 3B. A detailed longitudinal cross-sectional view of the lens cartridge  14  is shown in FIG.  6 . 
     The lens cartridge  14  comprises a lens holding portion  32  connected to a nozzle portion  34 . Preferably, the lens cartridge  14  is a one-piece construction, for example, made by plastic injection molding with autoclavable plastic (e.g. polyethylene). However, the lens holding portion  32  and nozzle portion  34  can be made as separate components and assembled together. 
     The lens cartridge  14  includes an extension  36  set substantially perpendicular relative to a longitudinal axes of the lens cartridge  14  for cooperating with the transverse slot  26  in the cone-shaped portion  22 . When loading the lens cartridge  14  into the lens cartridge receiver  16  of the cone-shaped portion  22 , the extension  26  is directed into the longitudinal slot  24 . The lens cartridge  14  is rotated relative to the lens injecting device  12  so that the extension  26  is then directed into the transverse slot  26  providing a locking “bayonet” type connection between the lens injecting device  12  and lens cartridge  14 . This connection arrangement ensures no relative movement between the lens injecting device  12  and the lens cartridge  14  during use of the lens injecting apparatus  10 . 
     The lens cartridge  14  is configured to open and close for loading the deformable intraocular lens into a lens delivery passageway through the lens cartridge  14 . In the embodiment shown in FIGS. 1 to  3 , the lens holding portion  32  includes a stationary wall portion  38  connected to a movable wall portion  40  by a transverse hinge  42 . The hinge  42  is considered “transverse”, since the hinge axis is substantially perpendicular or transverse relative to a longitudinal axes of the lens cartridge  14 . 
     The lens cartridge  14  is provided with a lens delivery passageway  44  extending through the lens holding portion  32  into the nozzle portion  34 . The back end  46  of the lens cartridge  14  is provided with an opening  48  serving as an entrance (e.g. for plunger tip) into the lens delivery passageway  44 , and the front end  50  of the lens cartridge  14  is provided with an opening  52  at nozzle tip  50  serving as an exit (e.g. for deformable intraocular lens) from the lens delivery passageway  44 . 
     The movable wall portion  40  is provided with a protrusion  56  extending inwardly into the lens delivery passageway  44 . The protrusion  56  is used to fold a center portion of the deformable intraocular lens into the lens delivery passageway  44  when closing the movable wall portion  40 . Specifically, a deformable intraocular lens L (e.g. plate type IOL or three piece type) can be loaded into the lens cartridge  14  by positioning a deformable intraocular lens in a flat configuration so that opposite edge portions of the deformable intraocular lens rest on the open edges  58  of the stationary wall portion  38 , as shown in FIG.  3 A. 
     When the movable wall portion  40  is being closed (e.g. by user pressing down on movable wall portion  40  with index finger while supporting stationary wall portion  38  between thumb and fore finger of other hand), the inwardly extending protrusion  56  makes contact with a center portion of the deformable intraocular lens L. As the movable wall portion  40  is further closed, the protrusion  56  forces the center portion of the deformable intraocular lens L downwardly into the lens delivery passageway  44 . When the deformable intraocular lens L is fully loaded into the lens delivery passageway, the deformable intraocular lens is folded or bent and in contact with the inner surface of the stationary wall portion  38  (FIG. 4) while opposite edges of the deformable intraocular lens L fold upwardly into opposite grooves  60  provided in the inner surface of the movable wall portion  40 . 
     The hinge  42  is a “live” type hinge molded in the plastic lens cartridge  14  so that the wall thickness decreases to allow bending. Preferably, the wall is thinned from the outside surface of the lens cartridge  14  so that the dimensions of the lens delivery passageway  44  are accurately maintained to prevent any edge that could potentially scrape or otherwise damage the surface of the deformable intraocular lens, in particular the optic portion, when advancing the deformable intraocular lens through the lens delivery passageway  44 . Alternatively, the movable wall portion  40  and the remaining portion of the lens cartridge are separate components assembly together along a hinge (e.g. snap-fit interlocking members or hinge pin designs). 
     In the first embodiment of the lens cartridge  14  shown in FIG. 6, the grooves  60  extend only along the length of the movable wall portion  40 . However, the grooves  60  can be extended forward further along lens delivery passageway  44  extending through the lens holding portion  32 , or extended even further into the lens delivery passageway of the nozzle portion  34 . Further, a single rifled groove (i.e. spiral configuration) can be substituted for the pair of grooves  60  to cause one end of the lens to continue to fold around the remaining portion of the lens to more tightly wrap the deformable intraocular lens as it is advanced through the lens delivery passageway. 
     The protrusion  56  shown in FIG. 6 tapers downwardly in the direction of the advancing deformable intraocular lens. Alternatively, the protrusion  56  can be modified so as to not taper, or taper in the opposite direction. In addition, the shape of the lower surface of the protrusion  56  can be curvilinear (e.g. concave, convex) continuous, discontinuous, or a combination of shapes, as opposed to being a linear ramp-shaped structure shown in FIG.  6 . 
     The deformable intraocular lens L is loaded into the lens cartridge  14  by positioning the deformable intraocular lens L, as shown in FIG.  3 A. Specifically, the deformable intraocular lens L bridges and rests on the edges  58  (FIG.  3 B). The user then forces the movable wall portion  40  downwardly while holding the remaining portion of the lens cartridge  14  so that the protrusion  56  forces the center of the deformable intraocular lens L downwardly causing the deformable intraocular lens L to fold along its center into the lens delivery passageway  44 . The lens cartridge  14  is then loaded into the lens cartridge receiver  16  of the lens injecting device  12  by aligning the extension  36  of the lens cartridge  14  with the longitudinal slot  24  of the lens injecting device  12 . The lens cartridge  12  is force rearwardly, and then rotated to lock the extension  36  into the transverse slot  24 . 
     A second preferred embodiment of the lens cartridge according to the present invention is shown in FIG.  7 . 
     The lens cartridge  14 ′ is provided with a hinge located forward of the extension  36 ′, as opposed to being located behind the extension  36  in the embodiment shown in FIG.  6 . This configuration allows a user to grip the extension  36 ′ between the thumb and finger of one hand to facilitate opening the movable wall portion  40 ′. Optionally, the lens cartridge  14 ′ can also be provided with an additional extension  36 ′ below to facilitate gripping the lens cartridge  14 ′ during opening and closing. Further, the additional extension  36 ′ provides added stability when the lens cartridge  14 ′ is loaded into the lens injecting device  12 . 
     A third embodiment of the lens cartridge  14 ″ is shown in FIG.  8 . 
     The lens cartridge  14 ″ is provided with a pair of grooves  60 ″ (See FIG. 2B) extending along the lens delivery passageway  44 ″ in both the lens holding portion  32 ″ and the nozzle portion  34 ″ (See FIGS. 9A to  9 B). The pair of grooves  60 ″ terminate at a position in the nozzle portion  34 ″, however, the pair of grooves  60 ″ can extend further forward and terminate all the way at the nozzle tip  54 ″. Further, the protrusion  56 ″ is shown as having a substantially constant depth along its length except for tapering into the lens delivery passageway  44 ″ in the nozzle portion  34 ″ at the front end of the protrusion  56 ″. Alternatively, the protrusion  56 ″ can taper linearly or curvilinearly in depth in either direction of the lens delivery passageway  44 ″ in other designs. 
     A fourth embodiment of the lens cartridge  114  is shown in FIGS. 10 and 11. 
     The lens cartridge  114  is provided with a movable wall portion  140  having a flat plate-like arrangement with a protrusion  156  extending inwardly into the lens delivery passageway  144 . The flat plate-like arrangement allows for a wider hinge connection improving strength and opening stability verses the more point-like hinge connection of the embodiment shown in FIG.  3 B. Further, the pair of grooves  160  are provided in the stationary wall portion  138  as opposed to the movable wall portion  40  in the embodiment shown in FIG.  3 B. In addition, the movable wall portion  140  is provided with an indent  141  at its free end to provide a catch to facilitate opening the lens cartridge  114 . 
     A fifth preferred embodiment of the lens cartridge  114 ′ is shown in FIGS. 12 to  15 . 
     The lens cartridge  114 ′ is provided with a movable wall portion defined by a hinged cantilever member  156 ′ for inserting the deformable intraocular lens into the lens delivery passageway  144 ′. In this embodiment, even with the cantilever member  156 ′ closed, the lens delivery passageway  144 ′ through the lens holding portion  132 ′ remains partially open due to the pair of slots  161 ′ located on either sides of the cantilever member  156 ′ (See FIG.  13 ). The cantilever member  156 ′ is provided with an extended tip  157 ′ to facilitate lifting the cantilever member  156 ′ for loading the deformable intraocular lens. In an alternative embodiment, the cantilever member  156 ′ is not hinged, thus, relying on its resilience to bend along its length to provide a hinge-like action for loading the deformable intraocular lens. 
     A sixth preferred embodiment of the lens cartridge according to the present invention is shown in FIGS. 16 and 17. 
     The lens cartridge  214  is configured for loading a deformable intraocular lens L in a flat configuration, as shown in FIG.  17 . This is accomplished by providing an oval-shaped lens delivery passageway in the lens holding portion  232 . The movable wall portion  240  is provided with a non-contoured essentially flat inner top wall  261  (i.e. no pair of grooves). Alternatively, the inner wall of the movable wall portion  261  can be provided with some surface contouring to begin folding the flat loaded lens when closing the movable wall portion  261 . 
     In this embodiment the forward end of the lens holding portion  232  and part of the nozzle portion  234  are provided with a ramp-shaped protrusion  256  dividing a pair of grooves in front of the movable wall portion  240  to facilitate folding of the deformable intraocular lens as it is advanced forward. 
     A seventh embodiment of the lens cartridge according to the present invention is shown in FIGS. 18 and 19. 
     The lens cartridge  315  is provided with an upper movable wall portion  340   a  and a lower movable wall portion  340   b . The upper movable wall portion  340   a  is connected to a remaining portion of the lens holding portion  332  by hinge  342   a , and the lower movable wall portion  340   b  is connected to the remaining portion of the lens holding portion by hinge  342   b . Thus, this is a double-hinge type design with no stationary wall portion characteristic of the embodiment shown in FIGS. 2 and 3.