FR3054432A1 - INTRAOCULAR LENS WITH ADJUSTABLE CENTERING - Google Patents

Abstract

It is an implant comprising an optical central part (2) forming a lens, having an optical center (C), and a peripheral part called haptic (3; 8,9), provided for fixing the lens (1) in the eye. The optical center (C) of the optical central part (2) is off-center, with respect to the circular periphery (6) of this optical central part (2), which is rotatably mounted on the circular inner edge (12) of a ring-shaped element (11) surrounding it. This element (11) is rotatably provided and has a circular outer edge (10) off-center with respect to its circular inner edge (12). The combination of rotations of the optical central part (2) and the ring-shaped element (11) makes it possible to adjust the position of the optical center (C) within a certain area. Such an intraocular lens (1) is in particular implantable in the crystalline sac.

Description

054 432

01184 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number:

(to be used only for reproduction orders)

©) National registration number

COURBEVOIE

©) Int Cl ⁸ : A 61 F2 / 16 (2017.01)

PATENT INVENTION APPLICATION

A1

©) Date of filing: 01.08.16. (30) Priority: © Applicant (s): COHEN GILBERT JOSEPH— FR. (72) Inventor (s): COHEN GILBERT JOSEPH. @) Date of public availability of the request: 02.02.18 Bulletin 18/05. (56) List of documents cited in the preliminary search report: See the end of this brochure (© References to other related national documents: ©) Holder (s): COHEN GILBERT JOSEPH. ©) Extension request (s): @) Agent (s): COHEN GILBERT.

£> 4 / INTRAOCULAR LENS WITH ADJUSTABLE CENTERING.

FR 3 054 432 - A1

It is an implant comprising an optical central part (2) forming a lens, having an optical center (C), and a so-called haptic peripheral part (3; 8, 9), intended to fix the lens (1) in the eye.

The optical center (C) of the optical central part (2) is offset from the circular periphery (6) of this optical central part (2), which is rotatably mounted on the circular inner edge (12) of a crown-shaped element (11) which surrounds it. This element (11) is provided for rotation and it has a circular outer edge (10) which is offset from its circular inner edge (12). The combination of the rotations of the optical central part (2) and the crown-shaped element (11) makes it possible to adjust the position of the optical center (C), within a certain area.

Such an intraocular lens (1) can in particular be implanted in the lens bag.

Adjustable centering intraocular lens

The present invention relates to an intraocular lens, which is an implant intended, once placed in a human eye, to focus the light rays received by the eye on its retina, by replacing the lens when transparency or refraction of the latter is defective. Such an implant is placed in the eyeball, in particular in the lens sac, during a surgical intervention.

In a generally known manner, an intraocular lens comprises an optical central part forming a lens, and a so-called haptic peripheral part, linked to the optical central part and intended to fix the latter in the eye.

As examples of such intraocular lenses, reference is made here to the published French patent applications FR 2 666 504 A1, FR 2 675 991 A1 and FR 2 931 356 A1. The embodiments described in these patent applications and in other documents are distinguished in particular from each other by the configuration of their haptics but, in general, the haptic forms with the optical part a one-piece body.

The correct centering of the intraocular lenses depends on the optical quality of the cornea-intraocular lens complex which refracts the light rays on the retina,

To date, the centering of the intraocular lenses depends on the shape of their haptic and on the fulcrum or anchoring points of the haptic in the eye, more particularly in the lens sac or on the capsulorhexis or in the sulcus or on the iris, depending on the method of attachment provided. For lack of better, haptics are currently used which allow an approximate centering answering the average of the implanted eyes.

Thus, the centering of an intraocular lens remains very imperfect today, the lens once placed in the crystalline sac being centered by the shape of its haptic. After a few days the fibrosis of the lens sac fixes the lens, but this fibrosis can change the position of the lens up to three months after it is put in place.

Currently, the centering of intraocular lenses becomes all the more important as the optical parts of these lenses are increasingly developed, with lenses correcting high-order aberrations, for example spherical aberrations, or providing a multiple focal or even providing a great depth of field. These complex optical parts are very sensitive to the centering of intraocular lenses, with consequences on the quality of sight of patients.

-2 implanted.

In summary, the centering of intraocular lenses is an important problem and becomes more and more with the optical evolution of these lenses.

Faced with this problem, the present invention aims to provide an intraocular lens designed to allow precise adjustment of the centering of the optical part, relative to a chosen axis, this during the implantation of the lens or during a second intervention, the proposed solution being independent of the shape of the haptic as well as the mode or position of fixation of the lens in the eye.

To this end, the invention mainly relates to an intraocular lens with adjustable centering, the lens comprising in known manner a central optical part forming a lens, having an optical center, and a so-called haptic peripheral part, linked to the central optical part and designed to fix the latter in one eye, this lens being essentially characterized in that:

the optical center of the optical central part occupies an off-center position, relative to the circular periphery of this optical central part, the optical central part is rotatably mounted, by its circular periphery, on the circular inner edge of a shaped element crown, surrounding said optical central part, the element in the form of a crown is provided for rotation and it has a circular outer edge off-center with respect to its circular internal edge, so that, by the combination of the rotations of the optical central part and of the crown-shaped element, the position of the optical center can be adjusted within a certain area.

In a first main embodiment of such an intraocular lens, the crown-shaped element belongs directly to the peripheral or haptic part of the lens. In this case, the intraocular lens consists of only two parts, namely the central optical part and the haptic, the latter being rotatable and thus participating in the adjustment of the centering.

In a second main embodiment of such an intraocular lens, the element in the form of a crown is an intermediate element, placed between the central optical part and the peripheral or haptic part, the latter forming an external crown or ring in which is rotatably mounted the intermediate element in the shape of a crown. In the latter case, the intraocular lens consists of three parts, namely the central optical part, the intermediate crown and the haptic, the latter being fixed unlike the previous case.

-3In both cases, by combining the rotation of the optical central part and the rotation of the crown-shaped element, which both have an eccentricity, the position of the optical center can be adjusted. the lens, and thus bring this optical center to a chosen point within a certain area.

In particular, by choosing an eccentricity equal to the eccentricity of the circular outer edge of the crown-shaped element for the optical center of the optical central part, said optical center can be brought to any desired point within a circular area, the radius of which depends on the value of this offset. The common value of the two eccentricities is advantageously between 0.25 and 1 millimeter, and it is preferably equal to approximately 0.5 millimeter, which allows an adjustment of the position of the optical axis within a circular area whose radius is between 0.5 and 2 millimeters.

The invention thus allows a precise adjustment of the centering of the optical part of an intraocular lens, in a sufficiently large and appropriate area, and in particular a alignment of the optical center with a particular chosen axis such as the line of sight or the visual axis, this during the implantation of the intraocular lens or during a subsequent intervention.

The intraocular lens which is the subject of the invention thus has a double practical interest:

on the one hand, it makes it possible to obtain an optical centering different from that imposed by the shape of the haptic, in the case of an implantation in the cristailinian sac or in the sulcus or of a fixation on the iris, or imposed by the place of capsulorhexis in the case of anchoring on the capsulorhexis, this during a first intervention;

on the other hand, it makes it possible to modify the centering of the lens after its final fixing, ie typically three months after its implantation, in order to refocus on the axis chosen during a second intervention.

The invention will in any case be better understood, and other characteristics and advantages will be highlighted, with the aid of the description which follows, referring to the appended schematic drawing representing, by way of examples, some forms of execution of this intraocular lens with adjustable centering; in this drawing:

Figure 1 is an overall front view of an intraocular lens according to a first embodiment of the invention;

FIG. 2 is a front view of the central optical part alone of the intraocular lens of the figure;

FIG. 3 is a cross-sectional view of this optical central part,

-4 following the line III-III of Figure 2;

Figure 4 is a front view of the single haptic of this intraocular lens, with its crown-shaped element;

Figure 5 is a cross-sectional view of the crown-shaped element, along V-V of Figure 4;

Figures 6 and 7 are diagrams illustrating the use of the intraocular lens according to the invention, with two different settings;

FIG. 8 represents, in front view, a second embodiment of the intraocular lens according to the invention.

The description given below and the figures to which this description refers correspond to an intraocular lens placed in the lens bag, without this resulting in a limitation of the scope of the invention, in particular the haptic which may vary according to the fixation site: lens bag, capsulorhexis, sulcus or iris.

Reference will first be made to FIGS. 1 to 5 which represent a first embodiment of an intraocular lens, generally designated by the reference numeral 1.

This intraocular lens 1 comprises an optical central part 2, and a peripheral or haptic part 3.

The central optical part 2, shown alone in FIGS. 2 and 3, itself comprises an optical part proper forming a lens 4, which has any shape suitable for the desired optical correction, for example a biconvex shape corresponding to a converging lens. This lens portion 4 has an optical center C, which is defined as the particular and unique point such that an incident light ray at this point is not deflected.

The optical central part 2 also includes, surrounding its lens part 4, a border 5 of generally annular and flattened shape, integral with the lens part 4. The border 5 is delimited on the outside by a circular edge 6. This circular external edge 6 has an eccentricity e, with respect to the optical center C of the part forming lens 4.

For example, the lens portion 4 has a diameter of 5.5 millimeters, while the offset e has a value of 0.5 millimeters. The border 5 has a maximum width of about 1 millimeter. In the widest zone of this border 5 is dug a through hole or a manipulation cavity 7, the axis of the hole or cavity 7 being able to be located at a radial distance of 0.7 millimeter from the circular outer edge 6 of the border 5.

The optical central part 2, which has just been described, can be produced for example from hydrophilic acrylic material, and it is introduced into the eye in the state of

-5 partial dehydration; its rehydration will allow it to increase in size by around 10%. The dimensions indicated above are those obtained after complete rehydration.

The haptic 3, shown alone in FIGS. 4 and 5, comprises in the illustrated example two branches 8 and 9 in the shape of a "J", connected at points diametrically opposite to the circular outer edge 10 delimiting an element in the shape of a crown 11 .

In a known manner, the two branches 8 and 9 ensure the particularly rotational stability of the haptic 3 in the lens sac.

The element in the form of a crown 11 has a circular internal edge 12 which is offset from its circular external edge 10, with an eccentricity e of value equal to that previously mentioned for the optical central part 2, ie 0.5 millimeter in the example considered.

More particularly, as shown in FIG. 5, the circular inner edge 12 of the crown-shaped element 11 comprises an annular groove 13, in which is engaged, in a rotary manner, the edge 5 of annular and flattened shape of the part optical center 2. The annular groove 13 is delimited by two lips of unequal widths, either for example an anterior lip (with reference to the patient) of 0.3 millimeter and a posterior lip (with reference to the patient) of 0.5 millimeter, which provides stabilization of the optical central part 2 during implantation.

The crown-shaped element 11 is pierced with at least one through hole, in the example illustrated two through holes 14 and 15, diametrically opposite or not, which on the one hand allow the manipulation of the haptic 3 for its positioning, and which on the other hand allow the circulation of fluids. In particular, use is made during implantation of viscoelastic gels which must be removed from the lens sac at the end of the intervention, and the holes 14 and 15 allow the evacuation of these gels if the intraocular lens 1 obstructs the capsulorhexis, especially when attached to capsulorhexis.

Haptic 3 as previously described can be produced, for example, from hydrophobic acrylic material.

The combination of the rotations of the optical central part 2 and of the element in the form of a crown 11 makes it possible, taking into account their respective eccentricities, to adjust the position of the optical center C within a certain circular area, zone which has a radius of 1 millimeter in the case of an eccentricity equal to 0.5 millimeter. The optical central part 2 and the crown-shaped element 11 are rotated using their respective manipulation holes 7 and 14,

-615 and an appropriate tool.

Figures 6 and 7 illustrate, by way of example, two distinct settings which can thus be obtained. In the case of FIG. 6, the optical center C is located at a distance from the visual axis A. In the case of FIG. 7, the optical center C is brought into superposition with the visual axis A.

FIG. 8 represents a second embodiment of the intraocular lens 1, the elements corresponding to those described above being designated by the same references and not being described again.

In this embodiment, the two branches 8 and 9 of the haptic 3 are connected, at diametrically opposite points, to an outer ring or ring 16 in which the element in the form of a crown 11 is rotatably mounted. Thus this element in the form of a crown 11 constitutes an intermediate element, placed between the optical central part 2 and the haptic 3. A connection by complementarity of shapes, for example with annular groove, is made between the circular outer edge 10 of the intermediate element in crown shape 11, on the one hand, and the circular inner edge of the crown or outer ring 16, on the other hand. As before, the combination of the rotations of the optical central part 2 and of the crown-shaped element 11 makes it possible to adjust the position of the optical center C, the crown-shaped element 11 rotating here inside the crown or outer ring 16 and of the haptic 3 which remain fixed.

It goes without saying that the invention is not limited to the sole embodiments of this intraocular lens which have been described above, by way of examples; on the contrary, it embraces all of the variant embodiments and applications respecting the same principle. It is thus, in particular, that one would not depart from the scope of the invention:

- by any modification of the haptics and in particular of its branches, the number and shape of which can vary, depending on the need or not for pressing on the periphery of the crystalline sac,

- by changes or adaptations of material and dimensions,

- by any localization and fixation of this intraocular lens other than in the lens sac, especially in the sulcus or on the iris, or even fixation with capsulorhexis.

Claims (10)

1) Intraocular lens with adjustable centering, the lens (1) comprising an optical central part (2) forming a lens, having an optical center (C), and a so-called haptic peripheral part (3; 8,9), linked to the part optical unit (2) and designed to fix the latter in one eye, characterized in that: the optical center (C) of the optical central part (2) occupies an off-center position, relative to the circular periphery (6) of this optical central part (2), - the optical central part (2) is rotatably mounted, by its circular periphery (6), on the circular internal edge (12) of a crown-shaped element (11), surrounding said optical central part (2), - the element in the form of a crown (11) is provided for rotation and it has a circular external edge (10) off-center with respect to its circular internal edge (12), so that, by the combination of the rotations of the optical central part (2) and the crown-shaped element (11), the position of the optical center (C) can be adjusted within a certain area. 2) Intraocular lens according to claim 1, characterized in that the crown-shaped element (11) belongs directly to the peripheral or haptic part (3) of the lens (1). 3) Intraocular lens according to claim 1, characterized in that the crown-shaped element (11) is an intermediate element, placed between the central optical part (2) and the peripheral or haptic part (3), the latter forming a crown or outer ring (16) in which is rotatably mounted the intermediate element in the form of a crown (11). 4) Intraocular lens according to claim 2 or 3, characterized in that the eccentricity (e) of the optical center (C) of the optical central part (2) is equal to the eccentricity (e) of the circular outer edge (10 ) of the crown-shaped element (11). 5) Intraocular lens according to claim 4, characterized in that the common value of the two eccentricities (e) is between 0.25 and 1 millimeter, and is preferably equal to about 0.5 millimeter. 6) Intraocular lens according to one of claims 1 to 5, characterized in that the central optical part (2) comprises a lens part (4) -8 itself and, surrounding this lens-forming part (4), a border (5) of generally annular and flattened shape, delimited externally by a circular edge (10) having an eccentricity (e) relative to the optical center (C) of the lens portion (4). 7) Intraocular lens according to claim 6, characterized in that in the widest zone of the border (5) of annular and flattened shape is dug a through hole or a handling cavity (7), 8) Intraocular lens according to claim 6 or 7, characterized in that the circular inner edge (12) of the crown-shaped element (11) has an annular groove (13), in which the edge is rotatably engaged (5) annular and flattened of the central optical part (2). 9) Intraocular lens according to claim 8, characterized in that the annular groove (13) is delimited by two lips of unequal widths. 10) Intraocular lens according to one of claims 1 to 9, characterized in that the crown-shaped element (11) is pierced with at least one through hole (14,15), for its manipulation and for circulation fluids. 1/5