CA2246764A1 - Intraocular implant for correcting short-sightedness - Google Patents
Intraocular implant for correcting short-sightedness Download PDFInfo
- Publication number
- CA2246764A1 CA2246764A1 CA002246764A CA2246764A CA2246764A1 CA 2246764 A1 CA2246764 A1 CA 2246764A1 CA 002246764 A CA002246764 A CA 002246764A CA 2246764 A CA2246764 A CA 2246764A CA 2246764 A1 CA2246764 A1 CA 2246764A1
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- CA
- Canada
- Prior art keywords
- extensions
- implant
- posterior
- portions
- intraocular implant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/16—Intraocular lenses
- A61F2/1602—Corrective lenses for use in addition to the natural lenses of the eyes or for pseudo-phakic eyes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/16—Intraocular lenses
- A61F2002/1681—Intraocular lenses having supporting structure for lens, e.g. haptics
Abstract
A posterior-chamber intraocular implant for correcting short-sightedness in a phakic eye is disclosed. The implant includes a substantially circular optical portion (30) consisting of a front dioptric surface (40), a rear dioptric surface (42) and a haptic portion. The haptic portion includes two extensions (32, 34) joined to the edge of the optical portion, of which the ends are spaced apart by a distance greater than the diameter of a dilated pupil, and two attachment portions (52, 54). The front surface of each extension comprises a toroidal portion (44) joined to the front dioptric surface, the rear surface of each extension comprises a toroidal portion (46) engaging the lens circumference and joined to the rear dioptric surface, and a connecting portion (48), and the rear dioptric surface and the toroidal portions on the rear surfaces of the extensions define a recess (50) for freely altering the curvature of the front lens surface.
Description
.. 1 INTRAOCULAR IMPLANT FOR CORRECTING SHORT-SIGHTEDNESS
The present invention has for its object an intraocular implant for correcting short-si~hte-1ness.
More precisely, the invention has for its object an intraocular implant for S correcting short-si~hterlness which is inten~le~l to be positioned in the posterior chamber of a phakic eye, i.e. an eye of which the lens was not removed during anoperation for ablation of the cataract.
Two important types of intraocular implant intended for correcting short-sighte~lness can be cited. In the first type of implant, the latter is intçncle-l to be 10 positioned in the anterior chamber of the eye. In accompanying Figure 1, a hllm~n eye has been shown in horizontal section, comprising thererole the cornea 10, the iris 12 with the pupil 14 and the lens 16 contained in the capsular sac 18 itself joined by 70m~ 21 on the inner wall of the eye.
Conventionally, anterior chamber 20 de~i~n~tes the space inside the eye 15 which extends between the cornea 10 and the iris 12. On the other hand, posterior chamber ~lesign~tes all the internal part of the eye to the rear of the iris 14.This posterior chamber therefore comprises a zone 22 which extends between the iris 12 and the anterior face of the lens 16 and a zone 24 inset with respect to the lens 16.
In the first type of implant for short-~ighte~lness, the latter is positioned in the anterior chamber 20. In this case, one of the difficulties encountered is that, in order to be able to correct the short-sightedness effectively, the optical portion of the implant necessarily presents a relatively thick edge. Taking into account the reAl-ce-l dimensions of the anterior charnber, there is therefole a real risk of the edge of the optical portion of the implant, positioned in the anterior chamber, tr~llm~ti7ing the 25 inner face of the cornea 10. Such tr~llm~ti~m may have serious consequences since the cells of the inner face of the tr~llm~ti7ell cornea c~nnot regenerate and this affectation (sic) tends to develop towards the central portion of the cornea, i.e. the one which performs the most important role in vision.
This is why, in the second type of implant for short-sightedness, an implantation of the latter in the posterior chamber is proposed and, in the case of the S phakic eye, in zone 22 of the posterior chamber, i.e. the one which extends between the iris and the anterior face of the lens 16.
The present invention concerns the second type of implant, i.e. a posterior chamber implant for phakic eye.
The positioning of such an implant also raises certain difficulties. In fact, the 10 space between the posterior face of the iris and the anterior face of the lens 16 is relatively reduced. This results in the implant being in contact both with the posterior face of the iris and the anterior face of the lens. This problem is rendered still more complex as the pupil 14 dilates and contracts depending on the light conditions to which the eye is subjected and, on the other hand, depending on the 15 desired or necessary accommodation, the shape of the lens 16 and in particular its anterior face 16a and therefole in particular the curvature of the front face 16a of the lens, is altered.
Furthermore, after having been positioned in the zone 22 of the posterior ch~mber, the implant is subjected to effects of pressure resulting from the aqueous 20 humor and the vitreous humor present in the anterior chamber and the posterior ch~mber and external pressures which may be applied to the whole of the eye. It is necessary that, under the effect of these di~erellt pressures, there is no risk of the implant leaving the posterior chamber and passing into the anterior chamber.
It is an object of the present invention to provide an intraocular implant for 25 short-sightedness for the posterior chamber of a phakic eye which better solves the problems set forth hereinabove, particularly by better allowing the respective deformations of the lens and the iris, while ensuring a very good holding of theimplant in place in the posterior chamber.
To attain this object, the posterior-chamber intraocular implant for correcting short-.ei~hte-lness in a phakic eye, comprising a subst~nti~lly circular optical portion S conei.e~ins~ of a front dioptric surface and a rear dioptric surface and a haptic portion, is characterized in that said haptic portion includes at least two extensions joined to the edge of the optical portion, of which the ends are spaced apart by a diametral distance greater than the diameter of a dilated pupil, and at least two portions for attachment on the wall of the chamber, the front surface of each extension 10 comprising a toroidal portion joined to the front dioptric surface, said toroidal portions being adapted to allow slide of the posterior face of the iris on said implant, the rear surface of each extension comprising a toroidal portion joined to the rear dioptric surface and forming portion en~ in~ the lens cil culllrelence, and a connecting portion, the rear dioptric surface and the toroidal portions of the rear 15 surfaces of said extensions defining a recess with respect to the surface (S)co~ -i"p; said connecting portions for freely altering the curvature of the front lens surface.
It will be understood that, thanks to the presence of the extensions, the intraocular implant is well held in the posterior chamber, whatever the degree of 20 dilation of the pupil of the iris. It will also be understood that, thanks to the presence of the recess formed in the posterior face of the optical portion of the implant, a free alteration of the curvature of the anterior face of the lens is allowed. It is also seen that, thanks to the presence of the toroidal engagement portions, the implant is in contact with the anterior face of the lens only by a peripheral zone not directly 25 concerned by the vision and over a very reduced ~nmll~r zone. Finally, it will also be understood that, thanks to the presence of the toroidal portion joined to the front dioptric surface of the implant, the iris may slide freely with respect to the anterior face of the implant during ~ tion or contraction of the pupil without there being a risk of the iris "sticking" on t_e implant.
Other characteristics and advantages of the invention will better appear from 5 reading the following description of a plerelled embodiment of the invention given by way of non-limiting example. The description refers to the accon~a lying Figures, in which:
Figure 1, already described, shows the diLrelel~l parts of the inside of the hllm~n eye.
Figure 2 is a view in front elevation of the implant for short-sighte~lness according to the invention.
Figure 3 is a side view of the implant of Figure 2.
Figure 4 is a top view showing the positioning of the implant for short-~ighte-lness in the posterior chamber of the eye; and Figure 5 is a view in detail of the implant showing a loop for attaching the haptic portion.
Referring firstly to Figures 2 and 3, a l~rt;relled embodiment of the implant for short-sightedness will be described. This latter comprises a sub~t~nti~lly circular optical portion 30 of radius (sic) D. In the particular example described, this 20 di meter is equal to 5.5 mm. More generally, the diameter D is included between 4 and 6 mm. At each end of the optical zone 30 in the direction of vertical axis XX', the implant comprises an exten~ion refelellced 32 and 34 respectively, which arejoined to the periphery 30a of the optical portion. These exten~ions belong to the haptic portion of the implant. In the example considered, the extensions are limite~l 25 by a free edge 34a and 32a of subst~nh~lly semi-circular form. In the exampleshown, the haptic portion also comprises two lateral portions 36 and 38 which join S
the exten.~ion~ 32 and 34 on either side of the optical portion 30. The optical portion 30 is, of course, limitefl by a front dioptric surface 40 which, in the example in question, is plane, and by a rear dioptric surface 42 which is concave. The anterior face of the exten~ions 32 and 34 is limited by a toroidal surface portion 44 which is 5 joined to the periphery of the front dioptric surface 40. If the posterior face of the exten~ions 32 and 34 is now considered, it is seen that it is defined firstly by a toroidal surface portion 46 forming eng~gçment surface then by a zone of connection 48, which is also toroidal or truncated. It is also seen that, with respect to the surface S which contains the connection surfaces 48 of the extensions 32 and 10 34, the rear dioptric surface 42 and the toroidal zone 46 define a posterior recess 50 whose function will be set for~h hereinafter. The lateral portions 36 and 38 present anterior and posterior faces which extend the anterior and posterior faces of the ext~n~ions 32 and 34.
As shown more clearly in Figure 2, the diametral distance between the ends 15 of the extensions 32 and 34, refelellced L in the Figures, is subst~nh~lly greater than the diameter D of the optical portion. In the example in question, L is equal to 8 m~n. More generally, L is included between 7 and 9 mm.
Finally, the haptic portion of the implant comprises, in addition to the extensions 32 and 34 and plerel~bly the lateral zones 36 and 38, two ~ chment 20 loops 50 and 52 and 54 which comprise an end 52a, 54a for connection on the ext~n~ions 32 or 34 and a free end 54b, 52b. In the particular example in question, the loops 52 and 54 are of the so-called "C" type.
As is well known, the free ends of the loops 52b and 54b are intended to engage on the inner wall of the posterior chamber in order to hold the implant in 25 place so that the optical portion 30 rem~in~ correctly centred, particularly with respect to the pupil 14.
In order to avoid, under the action of the pressures or of an external stress, the optical portion of the implant moving in the direction of the optical axis of the eye, each loops 52 and 54 preferably presents an ~n~ tion in a plane cont~ining the optical axis. In Figure 5, loop 54 has been shown more particularly; it is seen 5 that the first portion 54' of ~e loop closest to the end 54a makes an angle a with a plane orthogonal to the optical axis and that the second portion 54" closest to the end 54b makes an angle b with this same direction. The angulation correspon(1in~ to angle a tends to move the loop away from the anterior face of the optical portion while ~n~ll~tion b tends to bring it closer. This angulation means that, under the 10 effect of stresses applied to the loops in the direction of the principal plane of the implant, any axial displacement of the implant is subst~nti~lly avoided.
It goes without saying that the means for attachment of the haptic portion might take a form other than the loops shown in Figure 2.
It should also be noted that, in order to avoid an effect of suction of the lS implant with respect to the lens, due to the engagement portions 48 of the extensions and the lateral zones 36 and 38, there is provided, either in these zones of theextensions or in these zones of the lateral parts, a passage co~ icating the recess S0 with the interior of the eye in order to render pressures equal. It is also possible to provide that the total width L' of the implant at the level of the lateral zones 36 20 and 38 be such that a natural passage is produced between the engagement zones of the lateral portions and the anterior face of the lens. In that case, the pressures are rendered equal automatically.
Likewise prererably, in order to facilitate introduction of the implant in the eye, the lateral dimensions of the loops 52 and 54 are less than or equal to L'.
= =
More precisely, the lateral portions of the haptic portion each present a subst~nti~lly rectilinear free edge which joins the subst~nti~lly semi-circular edges of said çxt~n~ions.
Figure 4 shows the implant for short-sightedness positioned in the posterior 5 chamber 22 of the eye, the lens being at rest, i.e. without there being accommodation. This Figure shows that the anterior face of the implant is in contact with the posterior face of the iris 12 via the toroidal surface 44, which allows the iris to slide on the anterior face of the implant during dilations or contractions of the pUpil.
Figure 4 also shows that the posterior face of the implant is in contact with the anterior face of the lens 1 6a via the toroidal engagement surface 46 which effectively performs its role of engagement as the radius of curvature of the anterior face of the lens decreases to effect accommodation, Figure 4 showing the lens in its state of "non-accommodation". Moreover, the contact between the lens and the 15 surface 46 is a contact between a sphere and a toroidal surface portion. The contact surface is thererole ~nmll~r and very re~ ceA The first consequence of this is that this contact is produced on the peripheral zone of the lens and not on its central zone. The second consequence is that the central portion of the lens is opposite the recess 50 of the posterior face of the implant. This recess thererore allows an 20 alteration of the radius of curvature of the anterior face 16a of the lens without there being any contact between the lens and the posterior face 42 of the optics of the implant. This thel erore allows the curvature of the lens to be freely altered.
The projection of the loops on a plane orthogonal to the optical axis of the implant is l~rere.~bly entirely contained in that portion of said plane limited by the 25 straight lines ofthe plane co..l;.;..;..~ the projections on this plane ofthe free edges of the lateral portions of the haptic portion.
The present invention has for its object an intraocular implant for correcting short-si~hte-1ness.
More precisely, the invention has for its object an intraocular implant for S correcting short-si~hterlness which is inten~le~l to be positioned in the posterior chamber of a phakic eye, i.e. an eye of which the lens was not removed during anoperation for ablation of the cataract.
Two important types of intraocular implant intended for correcting short-sighte~lness can be cited. In the first type of implant, the latter is intçncle-l to be 10 positioned in the anterior chamber of the eye. In accompanying Figure 1, a hllm~n eye has been shown in horizontal section, comprising thererole the cornea 10, the iris 12 with the pupil 14 and the lens 16 contained in the capsular sac 18 itself joined by 70m~ 21 on the inner wall of the eye.
Conventionally, anterior chamber 20 de~i~n~tes the space inside the eye 15 which extends between the cornea 10 and the iris 12. On the other hand, posterior chamber ~lesign~tes all the internal part of the eye to the rear of the iris 14.This posterior chamber therefore comprises a zone 22 which extends between the iris 12 and the anterior face of the lens 16 and a zone 24 inset with respect to the lens 16.
In the first type of implant for short-~ighte~lness, the latter is positioned in the anterior chamber 20. In this case, one of the difficulties encountered is that, in order to be able to correct the short-sightedness effectively, the optical portion of the implant necessarily presents a relatively thick edge. Taking into account the reAl-ce-l dimensions of the anterior charnber, there is therefole a real risk of the edge of the optical portion of the implant, positioned in the anterior chamber, tr~llm~ti7ing the 25 inner face of the cornea 10. Such tr~llm~ti~m may have serious consequences since the cells of the inner face of the tr~llm~ti7ell cornea c~nnot regenerate and this affectation (sic) tends to develop towards the central portion of the cornea, i.e. the one which performs the most important role in vision.
This is why, in the second type of implant for short-sightedness, an implantation of the latter in the posterior chamber is proposed and, in the case of the S phakic eye, in zone 22 of the posterior chamber, i.e. the one which extends between the iris and the anterior face of the lens 16.
The present invention concerns the second type of implant, i.e. a posterior chamber implant for phakic eye.
The positioning of such an implant also raises certain difficulties. In fact, the 10 space between the posterior face of the iris and the anterior face of the lens 16 is relatively reduced. This results in the implant being in contact both with the posterior face of the iris and the anterior face of the lens. This problem is rendered still more complex as the pupil 14 dilates and contracts depending on the light conditions to which the eye is subjected and, on the other hand, depending on the 15 desired or necessary accommodation, the shape of the lens 16 and in particular its anterior face 16a and therefole in particular the curvature of the front face 16a of the lens, is altered.
Furthermore, after having been positioned in the zone 22 of the posterior ch~mber, the implant is subjected to effects of pressure resulting from the aqueous 20 humor and the vitreous humor present in the anterior chamber and the posterior ch~mber and external pressures which may be applied to the whole of the eye. It is necessary that, under the effect of these di~erellt pressures, there is no risk of the implant leaving the posterior chamber and passing into the anterior chamber.
It is an object of the present invention to provide an intraocular implant for 25 short-sightedness for the posterior chamber of a phakic eye which better solves the problems set forth hereinabove, particularly by better allowing the respective deformations of the lens and the iris, while ensuring a very good holding of theimplant in place in the posterior chamber.
To attain this object, the posterior-chamber intraocular implant for correcting short-.ei~hte-lness in a phakic eye, comprising a subst~nti~lly circular optical portion S conei.e~ins~ of a front dioptric surface and a rear dioptric surface and a haptic portion, is characterized in that said haptic portion includes at least two extensions joined to the edge of the optical portion, of which the ends are spaced apart by a diametral distance greater than the diameter of a dilated pupil, and at least two portions for attachment on the wall of the chamber, the front surface of each extension 10 comprising a toroidal portion joined to the front dioptric surface, said toroidal portions being adapted to allow slide of the posterior face of the iris on said implant, the rear surface of each extension comprising a toroidal portion joined to the rear dioptric surface and forming portion en~ in~ the lens cil culllrelence, and a connecting portion, the rear dioptric surface and the toroidal portions of the rear 15 surfaces of said extensions defining a recess with respect to the surface (S)co~ -i"p; said connecting portions for freely altering the curvature of the front lens surface.
It will be understood that, thanks to the presence of the extensions, the intraocular implant is well held in the posterior chamber, whatever the degree of 20 dilation of the pupil of the iris. It will also be understood that, thanks to the presence of the recess formed in the posterior face of the optical portion of the implant, a free alteration of the curvature of the anterior face of the lens is allowed. It is also seen that, thanks to the presence of the toroidal engagement portions, the implant is in contact with the anterior face of the lens only by a peripheral zone not directly 25 concerned by the vision and over a very reduced ~nmll~r zone. Finally, it will also be understood that, thanks to the presence of the toroidal portion joined to the front dioptric surface of the implant, the iris may slide freely with respect to the anterior face of the implant during ~ tion or contraction of the pupil without there being a risk of the iris "sticking" on t_e implant.
Other characteristics and advantages of the invention will better appear from 5 reading the following description of a plerelled embodiment of the invention given by way of non-limiting example. The description refers to the accon~a lying Figures, in which:
Figure 1, already described, shows the diLrelel~l parts of the inside of the hllm~n eye.
Figure 2 is a view in front elevation of the implant for short-sighte~lness according to the invention.
Figure 3 is a side view of the implant of Figure 2.
Figure 4 is a top view showing the positioning of the implant for short-~ighte-lness in the posterior chamber of the eye; and Figure 5 is a view in detail of the implant showing a loop for attaching the haptic portion.
Referring firstly to Figures 2 and 3, a l~rt;relled embodiment of the implant for short-sightedness will be described. This latter comprises a sub~t~nti~lly circular optical portion 30 of radius (sic) D. In the particular example described, this 20 di meter is equal to 5.5 mm. More generally, the diameter D is included between 4 and 6 mm. At each end of the optical zone 30 in the direction of vertical axis XX', the implant comprises an exten~ion refelellced 32 and 34 respectively, which arejoined to the periphery 30a of the optical portion. These exten~ions belong to the haptic portion of the implant. In the example considered, the extensions are limite~l 25 by a free edge 34a and 32a of subst~nh~lly semi-circular form. In the exampleshown, the haptic portion also comprises two lateral portions 36 and 38 which join S
the exten.~ion~ 32 and 34 on either side of the optical portion 30. The optical portion 30 is, of course, limitefl by a front dioptric surface 40 which, in the example in question, is plane, and by a rear dioptric surface 42 which is concave. The anterior face of the exten~ions 32 and 34 is limited by a toroidal surface portion 44 which is 5 joined to the periphery of the front dioptric surface 40. If the posterior face of the exten~ions 32 and 34 is now considered, it is seen that it is defined firstly by a toroidal surface portion 46 forming eng~gçment surface then by a zone of connection 48, which is also toroidal or truncated. It is also seen that, with respect to the surface S which contains the connection surfaces 48 of the extensions 32 and 10 34, the rear dioptric surface 42 and the toroidal zone 46 define a posterior recess 50 whose function will be set for~h hereinafter. The lateral portions 36 and 38 present anterior and posterior faces which extend the anterior and posterior faces of the ext~n~ions 32 and 34.
As shown more clearly in Figure 2, the diametral distance between the ends 15 of the extensions 32 and 34, refelellced L in the Figures, is subst~nh~lly greater than the diameter D of the optical portion. In the example in question, L is equal to 8 m~n. More generally, L is included between 7 and 9 mm.
Finally, the haptic portion of the implant comprises, in addition to the extensions 32 and 34 and plerel~bly the lateral zones 36 and 38, two ~ chment 20 loops 50 and 52 and 54 which comprise an end 52a, 54a for connection on the ext~n~ions 32 or 34 and a free end 54b, 52b. In the particular example in question, the loops 52 and 54 are of the so-called "C" type.
As is well known, the free ends of the loops 52b and 54b are intended to engage on the inner wall of the posterior chamber in order to hold the implant in 25 place so that the optical portion 30 rem~in~ correctly centred, particularly with respect to the pupil 14.
In order to avoid, under the action of the pressures or of an external stress, the optical portion of the implant moving in the direction of the optical axis of the eye, each loops 52 and 54 preferably presents an ~n~ tion in a plane cont~ining the optical axis. In Figure 5, loop 54 has been shown more particularly; it is seen 5 that the first portion 54' of ~e loop closest to the end 54a makes an angle a with a plane orthogonal to the optical axis and that the second portion 54" closest to the end 54b makes an angle b with this same direction. The angulation correspon(1in~ to angle a tends to move the loop away from the anterior face of the optical portion while ~n~ll~tion b tends to bring it closer. This angulation means that, under the 10 effect of stresses applied to the loops in the direction of the principal plane of the implant, any axial displacement of the implant is subst~nti~lly avoided.
It goes without saying that the means for attachment of the haptic portion might take a form other than the loops shown in Figure 2.
It should also be noted that, in order to avoid an effect of suction of the lS implant with respect to the lens, due to the engagement portions 48 of the extensions and the lateral zones 36 and 38, there is provided, either in these zones of theextensions or in these zones of the lateral parts, a passage co~ icating the recess S0 with the interior of the eye in order to render pressures equal. It is also possible to provide that the total width L' of the implant at the level of the lateral zones 36 20 and 38 be such that a natural passage is produced between the engagement zones of the lateral portions and the anterior face of the lens. In that case, the pressures are rendered equal automatically.
Likewise prererably, in order to facilitate introduction of the implant in the eye, the lateral dimensions of the loops 52 and 54 are less than or equal to L'.
= =
More precisely, the lateral portions of the haptic portion each present a subst~nti~lly rectilinear free edge which joins the subst~nti~lly semi-circular edges of said çxt~n~ions.
Figure 4 shows the implant for short-sightedness positioned in the posterior 5 chamber 22 of the eye, the lens being at rest, i.e. without there being accommodation. This Figure shows that the anterior face of the implant is in contact with the posterior face of the iris 12 via the toroidal surface 44, which allows the iris to slide on the anterior face of the implant during dilations or contractions of the pUpil.
Figure 4 also shows that the posterior face of the implant is in contact with the anterior face of the lens 1 6a via the toroidal engagement surface 46 which effectively performs its role of engagement as the radius of curvature of the anterior face of the lens decreases to effect accommodation, Figure 4 showing the lens in its state of "non-accommodation". Moreover, the contact between the lens and the 15 surface 46 is a contact between a sphere and a toroidal surface portion. The contact surface is thererole ~nmll~r and very re~ ceA The first consequence of this is that this contact is produced on the peripheral zone of the lens and not on its central zone. The second consequence is that the central portion of the lens is opposite the recess 50 of the posterior face of the implant. This recess thererore allows an 20 alteration of the radius of curvature of the anterior face 16a of the lens without there being any contact between the lens and the posterior face 42 of the optics of the implant. This thel erore allows the curvature of the lens to be freely altered.
The projection of the loops on a plane orthogonal to the optical axis of the implant is l~rere.~bly entirely contained in that portion of said plane limited by the 25 straight lines ofthe plane co..l;.;..;..~ the projections on this plane ofthe free edges of the lateral portions of the haptic portion.
Claims (10)
1. Posterior-chamber intraocular implant for correcting short-sightedness in a phakic eye, comprising a substantially circular optical portion (30) consisting of a front dioptric surface (40) and a rear dioptric surface (42) and a haptic portion, characterized in that said haptic portion includes at least two extensions (32,34) joined to the edge of the optical portion, of which the ends are spaced apart by a diametral distance (L) greater than the diameter of a dilated pupil, and at least two portions (52, 54) for attachment on the wall of the chamber, the front surface of each extension comprising a toroidal portion (44) joined to the front dioptric surface, said toroidal portions being adapted to allow slide of the posterior face of the iris on said implant, the rear surface of each extension comprising a toroidal portion (46) forming portion engaging the lens circumference and connected to the rear dioptric surface and a connecting portion (48), the rear dioptric surface and the toroidal portions of the rear surfaces of said extensions defining a recess (50) with respect to the surface (S) containing said connecting portions for freely altering the curvature of the front lens surface.
2. Intraocular implant according to Claim 1, characterized in that it comprises two extensions (32,34) diametrally opposite with respect to the optical part.
3. Intraocular implant according to Claim 2, characterized in that each extension (32,34) presents a free edge substantially in the form of a semi-circle, said extensions being joined together by lateral portions (36, 38) joined to the periphery of the optical portion, the anterior and posterior faces of said lateral portions (36, 38) extending respectively the toroidal portions (44,46) of the anterior and posterior faces of said extensions and the portions (48) for connection of said extensionswhereby the posterior face of the implant engages only on the periphery of the lens.
4. Intraocular implant according to Claim 3, characterized in that at least one of the extensions and/or at least one of the lateral portions of the haptic portionpresents an opening (28) made in the posterior face of the implant to communicate said recess (50) with the rest of the posterior chamber (22) thus avoiding a phenomenon of suction.
5. Intraocular implant according to either one of Claims 3 and 4, characterized in that it comprises two attachment elements (52, 54), each element having the shape of a curved loop presenting a first end for connection to the free edge of the corresponding extension and a free end.
6. Intraocular implant according to Claim 5, characterized in that each loop presents, in projection on a plane containing the optical axis of the implant, a first portion close to its first end, making an angle a with a plane orthogonal to theoptical axis so that said first portion moves away from the anterior face of theoptical portion, and a second portion close to the second end of the loop, making an angle b with a plane orthogonal to the optical axis so that said second portion moves closer to the anterior face of the optical portion, whereby said optical portionsubstantially does not move in the direction of the optical axis under the effect of the stresses applied to the implant.
7. Intraocular implant according to any one of Claims 3 to 6, characterized in that said lateral portions (36, 38) of the haptic portion each present a substantially rectilinear free edge (36a, 38a) which joins the substantially semi-circular edges of said extensions.
8. Intraocular implant according to Claims 5 and 7, characterized in that the projection of said loops on a plane orthogonal to the optical axis of the implant is entirely contained in that portion of said plane limited by the straight lines of the plane containing the projections on this plane of the free edges (36a, 38a) of the lateral portions of the haptic portion.
9. Intraocular implant according to any one of Claims 1 to 8, characterized in that the diameter (D) of the optical portion is included between 4 and 6 mm.
10. Intraocular implant according to any one of Claims 1 to 9, characterized in that the diametral distance (L) between the ends of the extensions is included between 7 and 9 mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9602053A FR2744908B1 (en) | 1996-02-20 | 1996-02-20 | MYOPIC INTRAOCULAR IMPLANT |
| FR9602053 | 1996-02-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2246764A1 true CA2246764A1 (en) | 1997-08-28 |
Family
ID=9489374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002246764A Abandoned CA2246764A1 (en) | 1996-02-20 | 1997-02-19 | Intraocular implant for correcting short-sightedness |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6110202A (en) |
| EP (1) | EP0886504A1 (en) |
| JP (1) | JP2000504612A (en) |
| CA (1) | CA2246764A1 (en) |
| FR (1) | FR2744908B1 (en) |
| WO (1) | WO1997030657A1 (en) |
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| DE4211265C1 (en) * | 1992-04-03 | 1993-07-29 | Adatomed Pharmazeutische Und Medizintechnische Gesellschaft Mbh, 8000 Muenchen, De | |
| WO1995028897A2 (en) * | 1994-04-19 | 1995-11-02 | Mcdonald Henry H | Lens insertable between the iris and the natural lens |
| FR2723691B1 (en) * | 1994-08-22 | 1997-01-24 | Philippe Crozafon | INTRAOCULAR IMPLANT |
| US5928282A (en) * | 1997-06-13 | 1999-07-27 | Bausch & Lomb Surgical, Inc. | Intraocular lens |
-
1996
- 1996-02-20 FR FR9602053A patent/FR2744908B1/en not_active Expired - Fee Related
-
1997
- 1997-02-19 CA CA002246764A patent/CA2246764A1/en not_active Abandoned
- 1997-02-19 JP JP9529850A patent/JP2000504612A/en active Pending
- 1997-02-19 US US09/125,371 patent/US6110202A/en not_active Expired - Fee Related
- 1997-02-19 EP EP97906223A patent/EP0886504A1/en not_active Ceased
- 1997-02-19 WO PCT/FR1997/000306 patent/WO1997030657A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0886504A1 (en) | 1998-12-30 |
| FR2744908A1 (en) | 1997-08-22 |
| JP2000504612A (en) | 2000-04-18 |
| US6110202A (en) | 2000-08-29 |
| FR2744908B1 (en) | 1998-06-12 |
| WO1997030657A1 (en) | 1997-08-28 |
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| EEER | Examination request | ||
| FZDE | Dead |