Injector for intraocular lens system

Abstract

Disclosed is an injector which comprises an injector housing having a longitudinal axis and an injection probe disposed along the longitudinal axis. The injector further comprises an intraocular lens disposed in the housing. The intraocular lens comprises first and second interconnected viewing elements, and the optical axes of the first and second viewing elements are substantially aligned. The optical axes are substantially orthogonal to the longitudinal axis of the housing. The injector further comprises a lens carrier which engages one of the viewing elements. The viewing elements are moveable in response to longitudinal movement of the lens carrier relative to the injector housing. The longitudinal movement causes both (i) the optical axes to be displaced relative to each other and (ii) the viewing elements to be disposed substantially on the longitudinal axis of the injector housing.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

Various embodiments disclosed herein pertain to insertion of intraocular lenses into the eye of a patient, as well as methods and devices for preparing an intraocular lens for insertion, and for achieving the insertion itself.

2. Description of the Related Art

Artificial intraocular lenses are often implanted to replace or supplement the natural crystalline lens. Such a lens may be implanted where the natural lens has developed cataracts or has lost elasticity to create a condition of presbyopia. Implantation devices have been developed to roll or fold an intraocular lens, and/or assist in implanting a rolled or folded lens through a small incision in the patient's eye. However, these known implantation devices suffer from various drawbacks, many of which are addressed by certain embodiments disclosed herein.

SUMMARY OF THE INVENTION

One aspect of the invention is an injector which comprises an injector housing having a longitudinal axis and an injection probe disposed along the longitudinal axis. The injector further comprises an intraocular lens disposed in the housing. The intraocular lens comprises first and second interconnected viewing elements, and the optical axes of the first and second viewing elements are substantially aligned. The optical axes are substantially orthogonal to the longitudinal axis of the housing. The injector further comprises a lens carrier which engages one of the viewing elements. The viewing elements are moveable in response to longitudinal movement of the lens carrier relative to the injector housing. The longitudinal movement causes both (i) the optical axes to be displaced relative to each other and (ii) the viewing elements to be disposed substantially on the longitudinal axis of the injector housing.

Another aspect of the invention is an injector which comprises an injector housing and an intraocular lens disposed within the housing. The intraocular lens has first and second interconnected viewing elements. The injector further comprises a lens carrier. The lens carrier is moveable relative to the injector housing along a continuously longitudinal path from a first position in which (a) the lens carrier engages the intraocular lens and (b) optical axes of the viewing elements are substantially aligned, to a second position in which (a) one of the viewing elements is forward of the other and (b) the viewing elements are at least partially compacted.

Another aspect of the invention is an injector which comprises an injector housing and an intraocular lens disposed within the housing. The intraocular lens has first and second interconnected viewing elements. The injector further comprises a lens carrier which is operable to move the intraocular lens from a home position of the intraocular lens along a continuously longitudinal path. The continuously longitudinal path extends distally from the home position, past a single-element engagement surface located distal of the home position, and between opposed lens-compacting surfaces located distal of the single-element engagement surface.

Another aspect of the invention is a method of preparing for implantation an intraocular lens having first and second interconnected viewing elements. The method comprises advancing the intraocular lens along a continuously longitudinal path such that one of the viewing elements is situated forward of the other and both of the viewing elements are compacted.

Another aspect of the invention is a method of preparing for implantation an intraocular lens having first and second interconnected viewing elements. The method comprises advancing the intraocular lens along a continuously longitudinal path, and causing, via the advancing, both: (a) one of the viewing elements to be situated forward of the other; and (b) both of the viewing elements to be compacted.

Another aspect of the invention is a method of preparing for implantation an intraocular lens having first and second interconnected viewing elements. The method comprises advancing the intraocular lens along a continuously longitudinal path. The method further comprises: while the intraocular lens is being advanced along the continuously longitudinal path, changing the intraocular lens from a first state in which optical axes of the viewing elements are substantially aligned, to a second state in which the optical axes are not substantially aligned. The method further comprises: while the intraocular lens is being advanced along the continuously longitudinal path, compacting the intraocular lens.

Certain objects and advantages of the invention are described herein. Of course, it is to be understood that not necessarily all such objects or advantages may be achieved in accordance with any particular embodiment of the invention. Thus, for example, those skilled in the art will recognize that the invention may be embodied or carried out in a manner that achieves or optimizes one advantage or group of advantages as taught herein without necessarily achieving other objects or advantages as may be taught or suggested herein.

All of the embodiments summarized above are intended to be within the scope of the invention herein disclosed. However, despite the foregoing discussion of certain embodiments, only the appended claims (and not the present summary) are intended to define the invention. The summarized embodiments, and other embodiments of the present invention, will become readily apparent to those skilled in the art from the following detailed description of the preferred embodiments having reference to the attached figures, the invention not being limited to any particular embodiment(s) disclosed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of one embodiment of an injector for an intraocular lens system.

FIG. 2 is a perspective view of the injector of FIG. 1, with the lens system in a displaced condition.

FIG. 3 is a perspective view of the injector of FIG. 1, with the lens system in a displaced and folded/crushed/compacted condition.

FIG. 4 is a perspective view of the injector of FIG. 1, with the lens system in the displaced and folded/crushed/compacted condition and an actuator thereof removed.

FIG. 5 is a perspective view of the injector of FIG. 1, with the lens system in the displaced and folded/crushed/compacted condition and a plunger thereof advanced forward.

FIG. 6 is a partial side sectional view of a housing of the injector of FIG. 1.

FIG. 7 is a detail perspective view of the actuator and lens system.

FIG. 8 is a detail perspective view of compacting members of the injector of FIG. 1.

FIG. 9 is a perspective view of the housing.

FIG. 10 is a side sectional view of the operation of the actuator.

FIG. 11 is a perspective view of the injector.

FIG. 12 is a rear detail view of one of the compacting members.

FIG. 13 is a perspective view of another embodiment of the injector.

FIG. 14 is a side sectional view of the injector of FIG. 13.

FIG. 15 is another side sectional view of the injector of FIG. 13.

FIG. 16 is a partial side sectional view of another embodiment of the injector.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIGS. 1-12 depict one embodiment of an injector 100 for injecting an intraocular lens 200 into the eye of a patient. In one embodiment, the intraocular lens 200 comprises an accommodating intraocular lens having two or more interconnected viewing elements or two or more interconnected optics. One, both or all of the viewing elements of the lens 200 may comprise an optic or lens having refractive (or diffractive) power. Alternatively, one, both or all of the viewing elements may comprise an optic with a surrounding or partially surrounding perimeter frame member or members, with some or all of the interconnecting members attached to the frame member(s). As a further alternative, one of the viewing elements may comprise a perimeter frame with an open/empty central portion or void located on the optical axis, or a perimeter frame member or members with a zero-power lens or transparent member therein. In still further variations, one of the viewing elements may comprise only a zero-power lens or transparent member.

In another embodiment, the intraocular lens 200 may comprise any of the various embodiments of accommodating intraocular lenses described in U.S. Patent Application Publication No. 2003/0078656, published Apr. 23, 2003, titled ACCOMMODATING INTRAOCULAR LENS SYSTEM WITH SEPARATION MEMBER, or any of the various embodiments of accommodating intraocular lenses described in U.S. patent application Ser. No. 10/958,871, filed Oct. 5, 2004, titled INTRAOCULAR LENS. The entire disclosure of the above-mentioned publication and the entire disclosure of the above-mentioned patent application are hereby incorporated by reference herein and made a part of this specification. In still other embodiments, the intraocular lens 200 may comprise a single-optic system, of the accommodating or non-accommodating type.

In one embodiment, where the lens 200 comprises a dual-optic system (or, more generally, a dual-viewing-element system), the injector 100 manipulates the lens 200 in two stages while moving the lens 200 along a single axis, specifically a longitudinal axis A-A of the injector 100. (The longitudinal axis A-A is also referred to herein as an “injection axis” of the injector.) In a first stage of manipulation, the injector 100 displaces first and second optics 202, 204 of the lens 200 into a non-coaxial relation (see FIGS. 2, 6), in which the optical axes B-B, C-C of the first and second optics 202, 204 are displaced relative to each other. Displacing the optics 202, 204 and their respective optical axes in this manner reduces the overall thickness of the lens 200. In a second stage of manipulation, the injector 100 compacts, folds or crushes the (thus-displaced) lens 200 into an injection channel 135 (see FIGS. 3, 4, 8) oriented along the injection axis A-A of the injector 100.

In one embodiment, the first optic 202 comprises an anterior optic and the second optic 204 comprises a posterior optic. The terms “anterior” and “posterior” are derived from the positions preferably assumed by the optics 202, 204 upon implantation of the lens 200 in an eye.

The injector 100 generally comprises a housing 102 and an actuator/lens carrier or “sled” 104 slidably mounted on the housing 100. The lens 200 is (initially) stored in the housing 102 in a home position, in a substantially unstressed storage condition (see FIG. 1; also known as a “neutral” or “packaged” condition). In the storage condition the optics 202, 204 are arranged substantially coaxially, with their respective optical axes B-B, C-C substantially aligned or collinear, and with their optical axes B-B, C-C oriented substantially orthogonal to the longitudinal axis A-A of the injector 100/housing 102. As the user advances the actuator 104 distally or forward along the housing, actuator pins 106, 108 formed on the actuator 104 (see FIG. 7) simultaneously advance forward in slots 110, 112 formed in the bottom of the housing 102. Because the pins 106, 108 protrude through the slots 110, 112 and engage one of the viewing elements of the lens 200, the forward advance of the pins 106, 108 urges the lens 200 forward or distally within the housing, generally along the slots 110, 112 and along the longitudinal axis A-A.

As the lens 200 is advanced forward, the first optic 202 comes into contact with an inclined portion or ramp portion 120 of the housing 102 (see FIG. 6). The inclined portion 120 forces the first optic 202 to move rearward and downward relative to the advancing second optic 204. Thus the first optic 204 falls behind the advancing second optic 204, urging the optics 202, 204 into a flatter, non-coaxial “displaced” condition as shown in FIGS. 2 and 6. As seen in FIG. 2, the optics 202, 204 preferably remain disposed substantially along the longitudinal axis A-A of the injector 100/housing 102 when the lens 200 is in the displaced condition shown in FIGS. 2 and 6. In one embodiment, the optics 202, 204 of the lens 200 are relatively displaced into a condition in which the optics do not “overlap” at all, as viewed along the optical axis of either optic. In still another embodiment, the optics 202, 204 are relatively displaced until the optics 202, 204 are in substantially planar, side-by-side alignment (either overlapping or non-overlapping) such that the thickness of the lens 200 is minimized.

The inclined portion 120 may be considered one type of “single-element engagement surface” as it is one of a variety of suitable structures which may be employed to engage one, but not the other, of the viewing elements of a two-viewing-element lens 200 as the lens 200 advances distally through the injector housing 102.

After the optics 202, 204 have been relatively displaced as shown in FIG. 6, the lens 200 and actuator 104 may be further advanced until the lens 200 is situated between a pair of compacting members or wedge plates 130, 132 (see FIG. 2). Tabs 134, 136 formed on the actuator 104 (and extending through slots 138, 139 formed on the sides of the housing 102, upon sufficient advancement of the actuator 104) engage the compacting members 130, 132 and urge the members 130, 132 forward along with the lens 200 and actuator 104.

As the compacting members 130, 132 move forward, they converge on the lens 200, due to the tapered configuration of the members' outer edges and the housing 102. Each of the compacting members 130, 132 forms a corresponding face 131, 133 in the form of a half-channel on its inner edge (see FIG. 8). Consequently, the converging faces 131, 133 compact, crush and/or fold the lens 200 (which is preferably urged into the “displaced” condition shown in FIGS. 2 and 6 before compacting) in the injection channel 135, which is formed at the meeting of the two members 130, 132 once the members have been driven all the way forward. The injection channel 135 thus formed is substantially aligned on the injection axis A-A with an injection probe or nozzle 140 formed by the housing 102, and a plunger 142. This injection channel 135, which preferably has a cross-section which substantially matches that of an inner lumen of the injector probe 140, holds the folded/crushed and displaced lens 200 ready for further distal longitudinal movement into the injector probe 142.

When the compacting members 130, 132 have reached the forwardmost/distalmost position just described and shown in FIG. 3, the members 130, 132 will have converged (and moved laterally) sufficiently for the tabs 134, 136 of the advancing lens carrier 104 to clear and disengage from the rearward surfaces of the members 130, 132. The lens carrier 104 may thus be further advanced distally, detached from the housing 102 and discarded (see FIG. 4).

As seen in FIG. 9, the housing 102 preferably forms a disengagement ramp 180 on its underside. The ramp 180 is positioned to force the pins 106, 108 of the lens carrier 104 to move downward and disengage from the lens 200 (and, if desired, disengage from the slots 110, 112) as the lens 200 moves between the compacting members 130, 132. The lens carrier preferably forms a flexible pin tab 182 (see FIGS. 4, 7) which is configured to contact the ramp 180 upon sufficiently distal movement of the lens carrier 104, and flex downward under the urging of the ramp 180, thus disengaging the pins 106, 108 as discussed above.

Once the compacting members 130, 132 have folded or compacted the lens 200, application of pressure to the plunger 142 drives the tip 143 of the plunger forward, into the injection channel 135 between the plates 130, 132 and against the “crushed” or “folded” lens 200 disposed therebetween (see FIG. 5). With continued application of pressure, the plunger 142 urges the lens 200 into the inner lumen of the probe 140. The end of the probe 140 may be inserted into the eye of a patient in the typical manner, for delivery of the lens 200 from the tip of the probe.

As seen in FIG. 12, each of the compacting members 130, 132 may include a lead-in 150 at the rearward or proximal end of the corresponding face 131, 133 to ensure that the tip 143 of the plunger 142 is easily inserted between the converged compacting members 130, 132.

FIGS. 13-15 depict another embodiment of the injector 100, which can be similar to the embodiment of FIGS. 1-12, except as further described and depicted herein. In this embodiment, the actuator/lens carrier 104 may comprise a thin elongate member or strip formed from a suitable polymer film (e.g., PET film). When the lens 200 is in the storage position (see FIG. 14), the first optic 202 rests on the actuator 104, and the second optic 204 is in contact with the adjacent wall of the housing 102. The actuator 104 is then drawn forward through the tip of the probe 140, and the actuator in turn pulls the lens 200 forward, causing displacement of the optics into a non-coaxial condition as described above (see FIG. 15). Once the lens 200 has been drawn between the compacting members 130, 132, the members may be converged by applying pressure to handles 160, 162 formed thereon. (Accordingly, the handles 160, 162 comprise an alternative (or supplement) to the actuator tabs 134, 136 discussed above.) With the lens 200 fully compacted, the plunger 142 may be employed in the usual manner, to push the lens through the injection channel 135 and out the tip of the probe 140.

Accordingly, in the embodiments of FIGS. 1-12 and 13-15, both the lens carrier 104 and the lens 200 are moved longitudinally, along a continuously longitudinal path, from a first or home position (FIG. 1) in which the lens carrier 104 engages the lens 200 and the optical axes B-B, C-C of the viewing elements or optics 202, 204 are substantially aligned, to a second position (FIG. 3) in which one of the viewing elements/optics is forward of the other and the viewing elements/optics are at least partially compacted. The continuously longitudinal path is, in these embodiments, generally coincident with the longitudinal axis or injection axis A-A. The continuously longitudinal path extends distally from the home position, past the single-element engagement surface 120 located distal of the home position, and between the opposed lens-compacting surfaces of the compacting members 130, 132, which are located distal of the single-element engagement surface 120.

The lens carrier 104 and the lens 200 are moved further longitudinally, along the continuously longitudinal path, from the second position to a third position in which the (displaced and compacted) lens 200 is situated within the injector probe 142. From the third position, the lens 200 is urged longitudinally, along the continuously longitudinal path, out the distal tip of the probe 142.

FIG. 16 depicts another embodiment of the injector 100, which can be similar to the embodiments of FIG. 1-12 or 13-15, except as further described and depicted herein. In the injector 100 of FIG. 16, the lens 200 is configured to move distally, along a continuously longitudinal path in which only a distal portion 302 thereof is substantially coincident with the longitudinal axis/injection axis A-A. Operation of the lens carrier 104 moves the lens distally and along an upslope 304, whereupon the first optic 202 contacts the single-element engagement surface 120. The surface 120 causes the first optic 202 to fall behind the second optic 204, thus displacing the lens 200 as described and depicted above. Once past the upslope 304, the displaced lens 200 proceeds distally, substantially along the longitudinal axis A-A, until the lens 200 reaches the compacting members (not shown in FIG. 16). The compacting and injection process then continues in the manner described and depicted above.

It is contemplated that the lens 200 may be positioned within (any of the embodiments of) the injector 100 (e.g., with the lens in the storage condition) during manufacture/assembly of the injector. The injector 100, with the lens 200 thus disposed inside, may then be sterilized as a unit, either at the point of manufacture or at some downstream location. Where appropriate, the sterilized injector-lens assembly may be contained in a sterile package, wrapper, bag, envelope, etc. in which the injector-lens assembly may remain until arrival at the point (or time) of use. (The injector-lens assembly may be sterilized before and/or after placement in the package, etc.) This facilitates a simple point-of-use procedure for medical personnel involved in implanting the lens 200 contained in the injector 100: after opening (any) packaging, the physician, or other medical personnel, can compact and insert the lens 200 using the injector 100 as discussed above, without (any need for) removing the lens 200 from the injector 100. Accordingly, there is no need to handle the lens 200 or manually load it into an insertion device at the point of use, both of which can be difficult and tedious, and can compromise the sterility of the lens.

Except as further described herein, any of the embodiments of the injector shown in FIGS. 1-16 may be similar to any of the embodiments of the injector disclosed in U.S. patent application Ser. No. 10/637,376, filed Aug. 8, 2003, titled METHOD AND DEVICE FOR COMPACTING AN INTRAOCULAR LENS. The entire disclosure of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

Although this invention has been disclosed in the context of certain preferred embodiments and examples, it will be understood by those skilled in the art that the present invention extends beyond the specifically disclosed embodiments to other alternative embodiments and/or uses of the invention and obvious modifications and equivalents thereof. Thus, it is intended that the scope of the present invention herein disclosed should not be limited by the particular embodiments described above, but should be determined only by a fair reading of the claims that follow.

Claims

1. An injector for injecting an intraocular lens along an injection direction, the injector, having proximal and distal ends, comprising: a housing, which stores the intraocular lens;an actuator, slidably mounted on said housing, which moves the intraocular lens distally within the housing and is removable when advanced past the distal end of the injector; anda pair of compacting members;wherein the housing and outer edges of the compacting members have a tapered configuration such that the compacting members, with the lens situated therebetween, by the actuator, converge on the lens to compact said intraocular lens as the compacting members move along the injection direction.

2. The injector of claim 1, further comprising handles formed on the compacting members.

3. The injector of claim 1, wherein said housing further comprises an injector probe.

4. The injector claim 1, wherein each of the compacting members comprises a face in the form of a half-channel on an inner edge, and wherein the compacting members together form an injection channel once the compacting members have been fully driven forward.

5. An injector for an intraocular lens, the intraocular lens having an optical axis and including an anterior surface and a posterior surface, the injector, having proximal and distal ends, comprising: an injector housing, which stores the intraocular lens, having a longitudinal axis and an injection probe disposed along the longitudinal axis;a compressive element disposed in the housing, the compressive element including a pair of wedges defining opposing compressing surfaces; andan advancer having a portion disposed outside the housing and a portion disposed in the housing, the advancer configured to engage with the compressive element and move the opposing compressive surfaces forward through the injector housing from a first position to a second position, the second position being disposed between the first position and the injector probe,wherein the opposing compressive surfaces of the compressive element converge towards each other as they move within the housing toward the second position, the compressive surfaces separated by a first distance transverse to the longitudinal axis when in the first position and by a second distance less than the first distance when in the second position, andfurther wherein the advancer is removable when moved past the distal end of the injector.

6. The injector of claim 5, wherein the compressive surfaces form an injection channel when the opposing compressive surfaces are in a forward most position.

7. The injector of claim 5, further comprising a plunger at least partially disposed outside the housing configured to be advanced within the injector probe.

8. The injector of claim 5, wherein the advancer comprises tabs that engage the opposing compressive surfaces.

9. The injector of claim 8, wherein the tabs extend through slots disposed in the housing, wherein the housing has sides, and the slots are disposed along the sides of the housing.

10. The injector of claim 5, further comprising one or more slots disposed on a bottom surface of the housing.

11. The injector of claim 10, wherein the advancer includes one or more pins that protrude through the one or more slots, the one or more pins and one or more slots configured to guide the intraocular lens within the housing.

12. The injector of claim 11, wherein the one or more pins extend from the advancer.

13. The injector of claim 5, wherein each wedge has an outer edge that engages the housing and an inner edge including a face in the form of a half-channel.

14. The injector of claim 6, wherein a cross-section dimension of the injection channel is equal to a cross-section dimension of an inner lumen of the injection probe.