MULTI-PART INTRAOCULAR LENS WITH LOCKING MECHANISM

Abstract

A multi-part intraocular lens (IOL) with an interchangeable optic seated on a base and secured by a locking mechanism. The optic comprises an anterior surface with a diameter greater than a diameter of a ring of the base. The posterior side of the optic has a posterior surface, a transition region for contact with the base, and sidewalls and tabs radially outward of the transition region. The sidewalls and tabs overlap at least a portion of the ring to reduce or even prevent decentration and tilt of the optic. Each tab has a lateral extension for coupling to the base.

Claims

1. An intraocular lens assembly, comprising: a base comprising: a ring comprising an anterior surface and a posterior surface defining a ring thickness; and a plurality of haptics extending from an outer surface of the ring, wherein each of the plurality of haptics comprises a gusset region forming a ring-haptic junction with the outer surface of the ring; and an optic, comprising: an anterior side, a posterior side, and a plurality of tabs protruding from the posterior side; wherein each of the plurality of tabs comprises a lateral extension configured to be positioned posterior to a posterior surface of a haptic of the plurality of haptics when the tab is positioned in one of the ring-haptic junctions.

2. The intraocular lens assembly of claim 1, wherein the outer surface of the ring defines a ring diameter.

3. The intraocular lens assembly of claim 2, wherein the anterior side of the optic comprises an anterior surface defining an anterior surface diameter greater than the ring diameter.

4. The intraocular lens assembly of claim 1, wherein the posterior side of the optic comprises: a posterior surface; a transition region radially outward of the posterior surface; and a pair of sidewalls located radially outward of the transition region, wherein each sidewall has a sidewall height.

5. The intraocular lens assembly of claim 4, wherein the sidewall height is greater than the ring thickness.

6. The intraocular lens assembly of claim 1, wherein each lateral extension comprises an anterior surface configured to be positioned in contact with a posterior surface of one of the plurality of haptics.

7. The intraocular lens assembly of claim 1, wherein an inner surface of the ring comprises a groove.

8. The intraocular lens assembly of claim 7, further comprising a second optic positioned in the groove.

9. The intraocular lens assembly of claim 1, wherein each of the plurality of haptics comprises a notch for receiving the lateral extension of one of the plurality of tabs.

10. The intraocular lens assembly of claim 1, wherein the anterior surface of each lateral extension comprises a recess for receiving a raised feature.

11. An intraocular lens assembly, comprising: a ring comprising an anterior surface, a posterior surface, and a plurality of posts extending radially from the ring; and an optic, comprising: an anterior side, a posterior side, and a plurality of tabs protruding from the posterior side; wherein each of the plurality of tabs comprises a lateral extension configured to be positioned posterior to one of the plurality of posts when the optic is seated on the ring.

12. The intraocular lens assembly of claim 11, wherein an outer surface of the ring defines a ring diameter.

13. The intraocular lens assembly of claim 12, wherein the anterior side of the optic comprises an anterior surface defining an anterior surface diameter greater than the ring diameter.

14. The intraocular lens assembly of claim 11, wherein: the plurality of posts extend radially outward from an outer surface of the ring; the plurality of tabs are located along a perimeter of the posterior side of the optic; and rotation of the optic relative to the ring contacts an anterior surface of each lateral extension with a posterior surface of one of the plurality of posts.

15. The intraocular lens assembly of claim 11, wherein: the plurality of posts extend radially inward from an inner surface of the ring; the plurality of tabs are located radially inward from an edge of the posterior side of the optic; and rotation of the optic relative to the ring contacts an anterior surface of each lateral extension with a posterior surface of one of the plurality of posts.

16. The intraocular lens assembly of claim 11, wherein the ring further comprises a pair of haptics extending from the outer surface of the ring.

17. An intraocular lens assembly, comprising: a ring, comprising: an anterior surface and a posterior surface defining a ring thickness; and a plurality of openings extending through the ring thickness from the anterior surface to the posterior surface; and an optic, comprising: an anterior side, a posterior side, and a plurality of tabs protruding from the posterior side, each of the plurality of tabs comprising a lateral extension; wherein each of the plurality of tabs is configured to extend through one of the plurality of openings such that an anterior surface of each of the lateral extensions is positioned against the posterior surface of the ring.

18. The intraocular lens assembly of claim 17, wherein the posterior side of the optic comprises a plurality of sidewalls extending from a perimeter of the posterior side.

19. The intraocular lens assembly of claim 18, wherein: each of the plurality of sidewalls has a sidewall height; and the sidewall height is greater than the ring thickness.

20. The intraocular lens assembly of claim 17, wherein the ring further comprises a pair of haptics extending from an outer surface of the ring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings illustrate example embodiments of the present disclosure. The drawings are not necessarily to scale, may include similar elements that are numbered the same, and may include dimensions (in millimeters) and angles (in degrees) by way of example, not necessarily limitation. In the drawings:

[0013] FIG. 1 is a perspective view of a multi-part IOL according to the present disclosure;

[0014] FIG. 2 is a perspective view of a base usable in the multi-part IOL shown in FIG. 1;

[0015] FIG. 3 is a perspective view of a base usable in the multi-part IOL shown in FIG. 1;

[0016] FIGS. 4A and 4B are front and side views, respectively, of an optic of the multi-part IOL shown in FIG. 1;

[0017] FIGS. 5A and 5B are perspective and close-up perspective views, respectively, of the multi-part IOL shown in FIG. 1;

[0018] FIGS. 6-8 are top views of a base for a multi-part IOL, illustrating alternative locations for a locking mechanism;

[0019] FIG. 9 is a close-up partial view of an IOL with an alternative locking mechanism; and

[0020] FIG. 10 is a perspective view of the multi-part IOL shown in FIG. 1 with an additional optic.

DETAILED DESCRIPTION

[0021] Reference will now be made in detail to examples of the present disclosure, which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. In the discussion that follows, relative terms such as “about,” “substantially,” “approximately,” etc. are used to indicate a possible variation of .+−.10% in a stated value, numeric or otherwise, unless other variations are indicated.

[0022] The following detailed description describes various embodiments of multi-part IOLs and multi-part IOL systems. Features described with reference to any one embodiment may be applied to and incorporated into other embodiments.

I. Multi-Part IOL with Interchangeable Optic and Locking Mechanism—Overview

[0023] FIG. 1 depicts a multi-part intraocular lens (IOL) 10 designed for ease of insertion and assembly in a capsular bag to correct an eye condition. IOL 10 includes interchangeable optic 12 seated on top of (anterior to) base 14. FIG. 1 further depicts one sidewall 16 of a pair of sidewalls 16 on optic 12 and one tab 18 of a pair of tabs 18 positioned relative to a pair of haptics 20, which form part of a locking mechanism, discussed below in greater detail.

[0024] During surgery, a surgeon can insert and position base 14 in a capsular bag, insert optic 12 into the capsular bag, and then align and couple optic 12 to base 14 such that optic 12 is seated on base 14. Sidewalls 16 and tabs 18 formed on optic 12 overlap at least a portion of base 14 to facilitate the positioning of optic 12 on base 14 or orienting optic 12 relative to base 14 during surgery. When optic 12 is positioned on base 14, sidewalls 16 and tabs 18 reduce or even prevent tilt and decentration of optic 12.

II. Base for Supporting an Optic in a Multi-Part IOL

[0025] FIGS. 2 and 3 depict perspective views of embodiments of a base 14 for use in multi-part IOL 10. In general, various designs and configurations of base 14 include ring 22 formed with haptics 20.

[0026] As depicted in FIGS. 2 and 3, ring 22 is formed with anterior surface 24, posterior surface 26, inner surface 28 and outer surface 30. A distance between anterior surface 24 and posterior surface 26 defines a ring thickness. Outer surface 30 defines a ring circumference. Inner surface 28 and outer surface 30 define a ring width. Referring to FIG. 2, one or more of anterior surface 24, posterior surface 26, inner surface 28 and outer surface 30 may be formed as smooth, continuous surfaces. FIG. 3 depicts a type of base 14 in which one or more of anterior surface 24, posterior surface 26, inner surface 28 and outer surface 30 are formed with openings 32 that allow a surgeon to more easily insert and manipulate base 14 or assemble IOL 10. Inner surface 28 may be formed with a radially inward facing recess or groove 34 commonly used to retain other types of optics.

[0027] Referring still to FIGS. 2 and 3, base 14 includes haptics 20 coupled to ring 22. Haptics 20 are shaped for positioning and stabilizing base 14 in the capsular bag. Each of haptics 20 has a gusset region 20a, an elbow region 20b and a distal region 20c. Gusset region 20a may be configured to move an attachment location of haptics 20 radially outward from ring 22 and may have openings 36 to allow a surgeon to insert and manipulate base 14. A pair of openings 36 in haptics 20 may define an axis (B-B) for base 14, discussed in greater detail below. Distal region 20c may be configured to provide a contact area between haptics 20 and the capsular bag. Elbow region 20b may be configured to provide a flexibility of haptic 20 to allow distal region 20c to engage a capsular bag for positioning and stabilizing ring 22 in the capsular bag. An inner surface of gusset region 20a and outer surface 30 of ring 22 form ring-haptic junction 38. In some embodiments, haptics 20 and ring-haptic junctions 38 are configured to form part of a locking mechanism of IOL 10, discussed below in greater detail.

III. Optic for Seating on a Ring of the Base

[0028] Typically, if an optic (not shown) is positioned inside a ring (such as ring 22 depicted in FIG. 3), the optic will have a diameter smaller than an inner diameter of the ring. As a result, this type of optic will be more difficult to position in a ring, the optic zone will be smaller and the ring has the potential to increase glare or other effects.

[0029] FIGS. 4A and 4B depict front and side views, respectively, of optic 12 configured with a large optic zone capable of being seated on (instead of seated in) ring 22. Referring to FIG. 4A, optic 12 comprises anterior surface 40 in which the optic portion may be defined over the optic diameter (D.sub.OPTIC) of optic 12. Due to the optic 12 being positioned on or over the ring 22, the optic may therefore be more anteriorly positioned, as well as have a larger anterior surface 40. These features of the optic 12 may offer benefits, such as, for example, mitigating undesirable photic phenomena and reducing the prevalence of glint. In some embodiments, anterior surface includes openings 50, discussed below. Optic 12 has a posterior side with a posterior surface 42 defining a radius of curvature for a posterior optic surface diameter (D.sub.POS) less than D.sub.OPTIC. The posterior optic surface diameter (D.sub.POS) may be equal to or greater than a diameter of inner surface 28 of ring 22. The posterior side of optic 12 further includes transition region 44 between posterior surface 42 and sidewalls 16. In certain embodiments, an intersection of posterior surface 42 and transition region 44 forms an angle. In certain embodiments, D.sub.POS of posterior surface 42 is approximately the same as a diameter of inner surface 28 of ring 22, such that the width of transition region 44 equals the width of ring 22.

[0030] Optic 12 further comprises components used for an embodiment of a locking mechanism. As depicted in FIGS. 4A and 4B, the posterior side of optic 12 includes sidewalls 16 and tabs 18 formed near the outer circumference of optic 12. Each sidewall 16 is configured with a height (H.sub.SIDEWALL) and each tab 18 is configured with a height (H.sub.TAB) such that sidewalls 16 and tabs 18 extend in the posterior direction to overlap a base (such as base 14 depicted in FIG. 2 or FIG. 3). Sidewalls 16 and tabs 18 may be formed with heights (H.sub.SIDEWALL) and (H.sub.TAB), respectively, to facilitate positioning of optic 12 on base 14 during surgery and reduce or even prevent decentration and tilt post-surgery. As depicted in FIG. 4B, the height (H.sub.SIDEWALL) of sidewalls 16 may vary circumferentially, and each sidewall 16 may be tapered or curved to improve usability. In some embodiments, sidewalls 16 are formed with height (H.sub.SIDEWALL) less than the thickness of ring 22 such that sidewalls 16 overlap a portion of, but do not completely cover, ring 22. In other embodiments, sidewalls 16 are formed with height (H.sub.SIDEWALL) equal to or greater than the thickness of ring 22 such that sidewalls 16 overlap to extend a distance posterior to ring 22.

IV. Locking Mechanism for a Multi-Part IOL

[0031] IOL 10 includes a locking mechanism to facilitate optic 12 remaining seated on base 14 in a desired orientation. FIGS. 2, 3, 4A and 4B depict portions of one embodiment of a locking mechanism. Referring to FIGS. 2 and 3, ring 22 comprises haptics 20 and FIGS. 4A and 4B depict tabs 18, wherein each tab 18 includes lateral extension 46. When optic 12 is seated on ring 22, positioning lateral extensions 46 posterior to haptics 20 may lock optic 12 to base 14. In some embodiments, when optic 12 is seated on anterior surface 24 of ring 22, the height H.sub.TAB of tabs 18 ensures lateral extensions 46 are generally positioned posterior to haptics 20. When lateral extensions 46 are generally positioned posterior to haptics 20, rotation of optic 12 in a first direction (e.g., clockwise) relative to an optical axis (OA) positions lateral extensions 46 posterior and proximate to haptics 20 such that optic 12 and ring 22 are connected. In some embodiments, optic 12 is rotatable in the first direction until anterior surfaces 48 of lateral extensions 46 contact posterior surfaces of haptics 20 to lock optic 12 to base 14.

[0032] The locking mechanism allows optic 12 to be unlocked from base 14. To unlock optic 12 from base 14, if optic 12 and ring 22 are connected and optic 12 is rotated in an opposite direction (e.g., counterclockwise relative to optical axis OA), lateral extensions 46 may be moved from a position proximate to haptics 20 to a position that is not proximate to haptics 20 such that optic 12 and ring 22 are disconnected and optic 12 can be separated from ring 22.

V. Assembly of a Multi-Part IOL with an Interchangeable Optic and a Locking Mechanism

[0033] A multi-part IOL 10, including base 14 and optic 12, may be implanted using various surgical techniques. A multi-part IOL 10 may be implanted by initially delivering base 14 into the capsular bag in a rolled configuration using an injector (a.k.a., inserter or delivery tube) inserted through a corneal incision, through the capsulorhexis, and into the capsular bag.

[0034] Base 14 may be ejected from the injector and allowed to unfurl. With gentle manipulation, haptics 20 of base 14 engage the inside equator of the lens capsule and center ring 22 relative to the capsulorhexis. Openings 36 in haptics 20 may facilitate handling of base 14 and indicate an orientation of base 14, including an axis (B-B) associated with an orientation of base 14.

[0035] Optic 12 may also be delivered in a rolled configuration using an injector, positioning the distal tip thereof adjacent to base 14. Optic 12 may be ejected from the injector and allowed to unfurl. With gentle manipulation, optic 12 is centered relative to the capsulorhexis. Optic 12 may have openings 50 for ease of insertion into a capsular bag, for removal of optic 12 from a capsular bag, and to help align optic 12 relative to base 14. Referring to FIG. 5A, optic 12 may have two openings 50 on one side of optic 12 and one opening 50 on an opposite side to indicate an orientation of optic 12. Openings 50 may facilitate identifying an axis (O-O) associated with an orientation of optic 12. Openings 50 may also serve as toricity markers or indicators, for further facilitating alignment of optic 12, as well as more generally IOL 10, in some embodiments.

[0036] Once optic 12 has been delivered and unfurled in the capsular bag, optic 12 may be connected to base 14.

[0037] Optic 12 may be connected to base 14 by first seating optic 12 on base 14. Optic 12 may be positioned on base 14 such that sidewalls 16 overlap at least a portion of ring 22. A small force may be applied until transition region 44 contacts anterior surface 24 of ring 22. FIGS. 5A and 5B depict perspective and close-up partial perspective views, respectively, of IOL 10 with optic 12 seated on base 14.

[0038] Still referring to FIGS. 5A and 5B, once optic 12 is seated on base 14, optic 12 may be manipulated to generally position tabs 18 in ring-haptic junctions 38. With tabs 18 positioned in ring-haptic junctions 38, rotation of optic 12 relative to optical axis (OA) may position lateral extensions 46 under haptics 20. In some embodiments, positioning lateral extensions 46 under haptics 20 causes contact between anterior surfaces 48 of lateral extensions 46 and posterior surfaces of haptics 20. In the embodiment depicted in FIGS. 5A and 5B in which tabs 18 are generally positioned in ring-haptic junctions 38, a clockwise rotation of optic 12 relative to optical axis (OA) will position lateral extensions 46 posterior to haptics 20 such that anterior surfaces 48 contact posterior surfaces of haptics 20.

[0039] Referring to FIGS. 3 and 5A, base 14 may have a first axis (B-B) and optic 12 may have a second axis (O-O). Base 14 may be inserted in the capsular bag and manipulated to orient first axis (B-B). Openings 36 on base 14 may facilitate insertion and manipulation of base 14, which may include orienting first axis (B-B). Furthermore, openings 50 on optic 12 may facilitate insertion and manipulation of optic 12, including aligning second axis (O-O) relative to first axis (B-B) to align optic 12 relative to base 14.

[0040] If needed, IOL 10 including optic 12 and base 14 may be removed by generally reversing the steps described above. Removal of IOL 10 begins by rotating optic 12 relative to base 14 to disengage tabs 18 from haptics 20. In the embodiment depicted in FIGS. 5A and 5B, a counterclockwise rotation of optic 12 will disengage lateral extensions 46 from haptics 20 such that lateral extensions 46 are posterior to—but not proximate to—haptics 20.

[0041] A probe or similar device may enter the capsular bag containing multi-part IOL 10. A probe or similar device may engage openings 50 in optic 12 and rotate optic 12. As optic 12 is rotated, lateral extensions 46 disengage from haptics 20. With gentle manipulation, optic 12 may be lifted such that optic 12 and base 14 are disconnected. The probe may remove one or more of optic 12 and base 14.

VI. Alternative Locking Mechanisms

[0042] Tabs 18 with lateral extensions 46 engaging haptics 20 provide an interlocking connection between base 14 and optic 12. More generally, one or more interlocking connections may be provided between base 14 and optic 12. Each interlocking connection may include a pair of interlocking members, wherein one or both of the interlocking members are actuatable. FIGS. 6-8 depict embodiments of base 14 formed with features usable in locking mechanisms for IOL 10.

[0043] Referring to FIG. 6, a pair of posts 52 may be formed on outer surface 30 of ring 22. Optic 12 (not shown in FIG. 6) may be configured with tabs 18 as described above with respect to FIGS. 4A and 4B. Optic 12 may be seated on base 14 and rotated as described above. However, instead of lateral extensions 46 engaging haptics 20, lateral extensions 46 engage posts 52 exterior to ring 22. Referring to FIG. 7, a pair of posts 52 may be formed on inner surface 28 of ring 22. Optic 12 (not shown) may be configured with tabs 18 located radially inward of transition region 44. Optic 12 may be seated on base 14 and rotated as described above. However, instead of lateral extensions 46 engaging haptics 20, lateral extensions 46 engage posts 52 in the interior of ring 22.

[0044] Referring to FIG. 8, a pair of openings 54 may be formed in ring 22. Tabs 18 may be formed in transition region 44 of optic 12 (not shown). When optic 12 is seated on base 14, tabs 18 extend through openings 54 such that rotation of optic 12 relative to ring 22 causes lateral extensions 46 to engage posterior surface 26 of ring 22.

[0045] An advantage to the embodiments depicted in FIGS. 6-8 may be that optic 12 can be coupled to base 14 without using haptics 20, even if haptics 20 are present. Furthermore, in embodiments with tabs 18 radially inward of the optic diameter (D.sub.OPTIC), sidewalls 16 can span a larger portion of the circumference to provide additional stability and other benefits.

[0046] Referring to FIG. 9, IOL 10 may utilize a locking mechanism in which anterior surfaces 48 of lateral extensions 46 are angled, as indicated by angle 56. Rotation of optic 12 relative to base 14 contacts anterior surfaces 48 of lateral extensions 46 with posterior surfaces 58 of haptics 20. Continued rotation generates a tensile force in tab 18, which may assist in seating optic 12 on base 14.

[0047] FIG. 9 also depicts notch 60 formed on the haptic 20. Notch 60 may receive tab 18 and lateral extension 46 such that tab 18 is flush with (i.e., does not extend past) the posterior surface of haptic 20 when optic 12 is seated on base 14 and lateral extensions 46 are positioned in notches 60.

[0048] FIG. 9 further depicts lateral extension 46 with recess 62, which may correspond to a raised feature 64 on a corresponding mating feature of haptic 20. Raised feature 64 positioned in recess 62 restrains or even prevents optic 12 from decoupling from base 14.

VII. Multi-Part IOLs Support Additional Optics

[0049] Referring to FIG. 10, embodiments described herein allow for other optic components to be added to IOL 10. As depicted in FIG. 10, IOL 10 includes optic 12 seated on base 14, and further depicts second optic 66 seated on (first) optic 12. Using techniques and features described above, a surgeon can insert base 14, insert and couple (first) optic 12 to base 14 and insert and couple second optic 66 to (first) optic 12. Furthermore, base 14 depicted in FIG. 10 comprises groove 34 such that another optical component (not shown) can be supported by base 14. The capability of having multiple optical components in a stable structure, with an increased optic zone, increases the usability of multi-part IOLs 10 for treatment of eye conditions. Furthermore, IOL 10 may be assembled such that haptics 20 are not necessary for adding second optic 66.

[0050] In general, multi-part IOL 10, comprising base 14 and optic 12, including the alternative embodiments described herein, allows for optic 12 to be adjusted or exchanged while leaving base 14 in place, either intra-operatively or post-operatively. Examples of instances where this may be desirable include, without limitation: exchanging optic 12 to correct a suboptimal refractive result detected intra-operatively; exchanging optic 12 to correct a suboptimal refractive result detected post-operatively (residual refractive error); rotationally adjusting optic 12 relative to base 14 to fine tune tonic correction; laterally adjusting optic 12 relative to base 14 for alignment of optic 12 with the true optical axis (which may not be the center of the capsular bag); and exchanging optic 12 to address the changing optical needs or desires of the patient over longer periods of time. Examples of the latter instance include, but are not limited to: an adult or pediatric IOL patient whose original optical correction needs to be changed as s/he matures; a patient who wants to upgrade from a monofocal IOL to a premium IOL (toric, multifocal, accommodating or other future lens technology); a patient who is not satisfied with their premium IOL and wants to downgrade to monofocal IOL; and a patient who develops a medical condition where an IOL or a particular type of IOL is contra-indicated.

[0051] By way of example, not necessarily limitation, an IOL according to embodiments of the present disclosure may be used to treat cataracts, large optical errors in myopic (near-sighted), hyperopic (far-sighted), and astigmatic eyes, ectopia lentis, aphakia, pseudophakia, and nuclear sclerosis. However, for purposes of description, the IOL embodiments of the present disclosure are described with reference to cataracts, which often occurs in the elderly population.

[0052] The foregoing discussion of the disclosure has been presented for purposes of illustration and description. The foregoing is not intended to limit the disclosure to the form or forms disclosed herein. Although the disclosure has included description of one or more embodiments and certain variations and modifications, other variations and modifications are within the scope of the disclosure, e.g., as may be within the skill and knowledge of those in the art, after understanding the present disclosure. It is intended to obtain rights which include alternative embodiments to the extent permitted, including alternate, interchangeable and/or equivalent structures, functions, ranges or steps to those claimed, whether or not such alternate, interchangeable and/or equivalent structures, functions, ranges or steps are disclosed herein, and without intending to publicly dedicate any patentable subject matter.