CA2237318A1 - Flexible intraocular implant - Google Patents
Flexible intraocular implant Download PDFInfo
- Publication number
- CA2237318A1 CA2237318A1 CA 2237318 CA2237318A CA2237318A1 CA 2237318 A1 CA2237318 A1 CA 2237318A1 CA 2237318 CA2237318 CA 2237318 CA 2237318 A CA2237318 A CA 2237318A CA 2237318 A1 CA2237318 A1 CA 2237318A1
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- Prior art keywords
- optical portion
- implant
- diameter
- optical
- circle
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Classifications
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- 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
- A61F2/1613—Intraocular lenses having special lens configurations, e.g. multipart lenses; having particular optical properties, e.g. pseudo-accommodative lenses, lenses having aberration corrections, diffractive lenses, lenses for variably absorbing electromagnetic radiation, lenses having variable focus
- A61F2/1616—Pseudo-accommodative, e.g. multifocal or enabling monovision
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- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Abstract
A unitary intraocular implant made of a flexible material and provided with a substantially circular optical portion (50) and a haptic portion consisting of two attachment elements (52, 54) that each comprise a contact portion (56) for engaging the inner wall of the eye, as well as connecting means (58). Said contact portions have the shape of an arc of a circle with substantially the same centre as the optical portion. The length of the chord (C) adjacent to each contact portion (56) is substantially the same as the diameter (D) of the optical portion. Each connecting means (58) consists of a continuous web defined by edges (60, 62) having a regular curvature, and the distance between the two points on the web that are located on a common line perpendicular to the axis of symmetry (XX') of the implant in the direction of the attachment elements is smaller than the diameter of the optical portion.
Description
CA 02237318 1998-0~-11 , FLEXIBLE INTRAOCULAR IMPLANT
The present invention has for its object a flexible intraocular implant.
Intraocular implants constitute systems for correcting human eyesight which may, in a certain number of cases, replace contact lenses or external 5 corrector glasses. In other cases, these implants may be combined for example with corrector lenses to obtain a suitable correction of the eyesight. An intraocular implant is essentially composed of an optical portion of generally circular or slightly ovalized shape which forms the optical corrector system proper. It also comprises a haptic portion which serves to position and attach the 10 optical portion inside the eye in the suita~le position.
The so-called cataract operation is now most often being carried out in accordance with the operating technique called phaco-emulsification. This technique allows the ablation of the opaque crystalline lens by the introductioninto the eye of an ultrasonic probe provided with an irrigation/suction system. By 15 the combined action of the ultrasounds and the flow of BBS, the crystalline is withdrawn by em~ ification.
This operating technique presents the advantage over the prior techniques of requiring only an incision of reduced dimensions in the cornea in order to introduce into the eye the material necessary for this ablation. It will therefore be 20 readily understood that it is advantageous to have available intraocular implants which may be introduced inside the eye and positioned via the incision of reduced dimensions which is the only one necessary during the lens ablation operation.
With the implants which are most often developed at the present time and which are made of PMMA, i.e. a rigid material, whatever the precautions taken 25 for producing the haptic portions, the incision must necessarily have a sufficient CA 02237318 1998-0~-11 dimension to allow at least the optical portion of the impl~nt, whose diameter is of the order of 6 mm, to pass.
In order to make it possible to reduce even further the dimensions of the implant in the phase of introduction inside the eye through the incision, it has5 already been proposed to produce implants with the aid of flexible and hydrophilic materials known under the name of HYDROGEL. Thanks to the very great flexibility of this material, it is possible to bend or roll the implant, including its optical portion, to pass it though the incision, the implant resuming its normal shape and dimensions when it is positioned in the eye.
However, by reason of its very great flexibility, the production of the haptic portion of the implant raises particular problems for ensuring attachment and suitable positioning of the implant inside the eye, particularly when this implant is positioned in the capsular sac. It will be understood in particular that it is necessary that the haptic portion develops a sufficient force of hold in order to 15 avoid the risks of ejection of the implant out of the capsular sac.
In order to solve this problem, European Patent Application 579 528 describes a plurality of types of flexible implants adapted to be implanted in the posterior chamber.
Accompanying Figure 1 a shows in simplified manner the general shape of 20 one of the embocliments described in the European Patent Application mentioned hereinbefore. This implant essentially comprises a circular optical portion 10 and a haptic portion constituted by two attachment elements respectively lererellced12 and 14. According to this embodiment, each attachment element comprises a contact portion 16 in the form of an arc of circle intended to come into contact25 with the inner wall of the eye and, more precisely, of the capsular sac, thiscontact portion 16 being connected to the periphery of the optical portion 10 by CA 02237318 1998-0~-11 ~ 3 two arms 18 and 20 which thus define therebetween, in each attachment element, a window 22 of relatively large dimensions. Such an implant effectively holds itin place in the capsular sac in efficient manner, avoiding the risks of ejectionthereof out of the capsular sac.
However, such an implant presents certain drawbacks concerning its positioning in the eye. As the implant is made of a supple material such as hydrogel, the implant is introduced in the eye through an incision after this implant has been bent into two, as shown schematically in Figure lb. The bent implant is m~int~ined in this position with the aid of a surgical instrument 24 in 10 the form of forceps, the ends of the arms of the forceps such as 26 presenting three contact or ~ipp~lg points 28, 30 and 32. Due to the presence of the windows 22 in the implant ~ffaçhing elements, the points of contact 28 and 32 ofthe surgical instrument hold the attachment elements of the haptic portion badlyor not at all, in bent form. This results in that they are relatively free during the 15 implantation of the implant in the eye which, on the one hand, renders passage of the implant through the incision made in the cornea more difficult and, on the other hand, risks c~l~sing the contact portions 16 to break.
In addition, it is seen that, as the contact portion 16 has a length greater than that of the diameter of the optical portion 10, the dimensions of the implant 20 once bent still remain relatively large during its passage in the incision made in the cornea.
It is an object of the present invention to provide an intraocular implant made of a flexible material which presents characteristics such that its implantation in the eye, particularly with the aid of the tool defined hereinabove, 25 is facilitated while ensuring the same quality of hold of the implant in the eye after it has been placed in position.
CA 02237318 1998-0~-11 In order to attain this object, according to the invention, the unitOEy intraoculOE implant made of a flexible material OEnd provided with a sub~t~nti~lly circulOE optical portion and a haptic portion consisting of two attachment elements diOEmetrally opposite with respect to said optical portion, each S ~tt~çhment element comprising a contact portion for en~ging the inner wall of the eye, as well as meOEns for connecting said contact portion to the periphery of said optical portion, said contact portions having the shape of OEn OEC of a circle with subst~nti~lly the same centre as the optical portion, is chOEacterized in that the length of the chord adjacent to each contact portion is sub~t~nti~lly the same 10 as the diameter of the optical portion, in that each connecting means consists of a continuous web extending between said contact portion and the periphery of said optical portion, said web being defined by edges having the shape of a curve with regulOE curvature, each curve extending between one end of the contact portion OEnd a point of the periphery of the optical portion, and the distance between the 15 two points on the edges of the web that OEe located on a common line perpendiculOE to the axis of symmetry of the implant in the direction of the ~tt~çhment elements being smaller than the diameter of said optical portion.
It will be understood that, thanks to the fact that the attachment elements OEe continuous, these attachment elements will be well m~int~ined in bent 20 position with the aid of the surgical instrument serving to insert it in the eye. In addition, it will be understood that, thanks to the relatively short length of the contact portions which is of the order of m~pnitllcle of the diOEmeter of the optical portion, the transverse dimensions of the implant once bent is reduced to a maxilllulll since it corresponds subst~nti~lly to half the diameter of the optical 25 portion. Finally, it is seen that, as each web connecting the contact portion to the periphery of the optical portion presents at least one portion of which the width is CA 02237318 1998-0~-11 reduced with respect to that of the contact portion and the optical portion, there is effectively obtained, at the level of each contact portion, an effect of anchoring between the front and rear walls of the capsular sac after the implant has been placed in position, this ensuring hold of the implant in the capsular sac.
According to a prererled form of embo(liment, the optical portion of the implant is limited by two respectively anterior and posterior surfaces in the form of spherical caps each limited by a circle, the circle of the anterior surface presenting a diameter smaller than that of the posterior surface.
It will be understood that this arrangement makes it possible to reduce the 10 thickness of the optical portion in its thickest zone, i.e. that corresponding to its optical axis while m~ g the same curvature of the posterior face of the optical portion. Better bending qualities of the optical portion are thus obtained, due to the reduction of its thickness, while m~ the same quality of contact of the posterior face of the implant on the posterior wall of the capsular 15 sac.
Other characteristics and advantages of the invention will appear more readily from reading the following description of an embodiment of the inventiongiven by way of non-limiting example. The description refers to the accompanying Figures in which:
Figure 1 a, already described, shows a flexible intraocular implant of known type.
Figure lb, already described, illustrates the mode of bending and inserting the implant of Figure l_ in the eye.
Figure 2a is a front view of a flexible implant according to the invention.
Figure 2b is a side view of the implant of Figure 2a, and CA 02237318 1998-0~-11 Figure 3 is a schematic side view of the implant, showing the mode of geometric definition of the attachment elements of the haptic portion of the implant.
T_e general shape of the flexible unitary implant will be described with lerelellce to Figures 2a and 2b. The implant is constituted by a subst~nti~lly circular optical portion 50 and by a haptic portion constituted by two attachment elements 52 and 54 disposed subst~nh~lly diametrally opposite with respect to the optical portion 50. O is the centre of the optical portion, XX' the axis of symmetry of the implant in the direction of the ~tt~hment elements 52, 54 and 10 YY' the second axis of symmetry of the impl~nt. Finally, ZZ' is the axis of revolution of the optical portion of the implant 50. As the two ~tt~çhment elements 52 and 54 are identical, only the attachment portion 52 will be described in detail. The implant is pleI~l ~bly made of hydrogel.
The latter is constituted by a contact portion 56 having the general form of 15 an arc of circle of centre O and diameter Dl . The chord C which is adjacent to the attachment portion 56 has a length subst~nti~lly equal to the diameter D of the optical portion. The edge 56a of the contact portion is rounded in cross section.
The contact portion 56 is connected to the periphery 50a of the optical portion by two assemblies 58 in continuous web form which therefore extend from the 20 periphery 50a of the optical portion up to the contact portion 56. This web is limited by two edges 60 and 62 respectively which each have the shape of a curve presenting a regular curvature. More precisely, each curve defining a contour (sic.) 60, 62 is l~lerelably connected tangentially to the periphery SOa of the optical portion and it is connected by a bent portion 64 to the contact portion 25 56. The variable radius of curvature of the edges 60, 62 is such that, between the contact portion and the periphery of the optical portion, the length l between two CA 02237318 1998-0~-11 points Pl and P2 of the edges of one of the webs 58 is less than the diameter D of the optical portion. Preferably again, the angle at the centre _ corresponding to the two points P'l and P'2 of connection to the periphery 50a of the optical portion is less than 180 degrees but greater than 90 degrees. This angle _ may advantageously be included between 110 and 130 degrees.
As is shown more clearly in Figure 2b, each web 58 presents a thickness which decreases from the contact portion 56 up to the periphery 50a of the optical portion. In addition, it is seen in this Figure that the diameter D2 of the circle limiting the anterior diopter 70 in the form of a spherical cap is smaller than the 10 diameter D3 of the posterior diopter 72 likewlse in the form of a spherical cap.
This difrelence in di~meter makes it possible, thanks to a larger di~meter D3, for the posterior diopter, to ensure a good contact between the posterior wall of the capsular sac while reducing the thickness e of the optical portion along its axis of revolution ZzT.
D2 plerel~bly measures 5.5 mm and D3, 6mm. In addition, the diameter Dl of the haptic portion is equal to 11 mm. The thickness El of the contact portion 56 is included between 0.4 and 0.5 mm, while the thickness E2 of the web in its zone of connection to the optical portion is of the order of 0.2 to 0.25 mm.
Referring now to Figure 3, there will be described the mode of definition of the shape of the attachment elements 52 and 54 (anterior face in the case of Figure 3) is disposed (sic~ on a toric surface portion T shown in broken lines in Figure 3. This portion of torus is defined by the rotation of a circle of centre O' and of radius Rl about the optical axis ZZ' of the implant. During this rotation, 25 the centre O' describes a circle of diameter D4, this circle being centred on axis ZZ' and disposed in a plane orthogonal to this axis. The radius Rl is preferably included between 5 and 30 mm and the diameter D3 is included between 5 and 30 mm.
It should be added that the invention exploits only the properties of flexibility and of pliability of the hydrogel and not its hydrophilic properties. The 5 implant according to the invention may there~l e be produced equally well in another flexible material such as silicone which is also well known for m~kin~
intraocular implants.
The present invention has for its object a flexible intraocular implant.
Intraocular implants constitute systems for correcting human eyesight which may, in a certain number of cases, replace contact lenses or external 5 corrector glasses. In other cases, these implants may be combined for example with corrector lenses to obtain a suitable correction of the eyesight. An intraocular implant is essentially composed of an optical portion of generally circular or slightly ovalized shape which forms the optical corrector system proper. It also comprises a haptic portion which serves to position and attach the 10 optical portion inside the eye in the suita~le position.
The so-called cataract operation is now most often being carried out in accordance with the operating technique called phaco-emulsification. This technique allows the ablation of the opaque crystalline lens by the introductioninto the eye of an ultrasonic probe provided with an irrigation/suction system. By 15 the combined action of the ultrasounds and the flow of BBS, the crystalline is withdrawn by em~ ification.
This operating technique presents the advantage over the prior techniques of requiring only an incision of reduced dimensions in the cornea in order to introduce into the eye the material necessary for this ablation. It will therefore be 20 readily understood that it is advantageous to have available intraocular implants which may be introduced inside the eye and positioned via the incision of reduced dimensions which is the only one necessary during the lens ablation operation.
With the implants which are most often developed at the present time and which are made of PMMA, i.e. a rigid material, whatever the precautions taken 25 for producing the haptic portions, the incision must necessarily have a sufficient CA 02237318 1998-0~-11 dimension to allow at least the optical portion of the impl~nt, whose diameter is of the order of 6 mm, to pass.
In order to make it possible to reduce even further the dimensions of the implant in the phase of introduction inside the eye through the incision, it has5 already been proposed to produce implants with the aid of flexible and hydrophilic materials known under the name of HYDROGEL. Thanks to the very great flexibility of this material, it is possible to bend or roll the implant, including its optical portion, to pass it though the incision, the implant resuming its normal shape and dimensions when it is positioned in the eye.
However, by reason of its very great flexibility, the production of the haptic portion of the implant raises particular problems for ensuring attachment and suitable positioning of the implant inside the eye, particularly when this implant is positioned in the capsular sac. It will be understood in particular that it is necessary that the haptic portion develops a sufficient force of hold in order to 15 avoid the risks of ejection of the implant out of the capsular sac.
In order to solve this problem, European Patent Application 579 528 describes a plurality of types of flexible implants adapted to be implanted in the posterior chamber.
Accompanying Figure 1 a shows in simplified manner the general shape of 20 one of the embocliments described in the European Patent Application mentioned hereinbefore. This implant essentially comprises a circular optical portion 10 and a haptic portion constituted by two attachment elements respectively lererellced12 and 14. According to this embodiment, each attachment element comprises a contact portion 16 in the form of an arc of circle intended to come into contact25 with the inner wall of the eye and, more precisely, of the capsular sac, thiscontact portion 16 being connected to the periphery of the optical portion 10 by CA 02237318 1998-0~-11 ~ 3 two arms 18 and 20 which thus define therebetween, in each attachment element, a window 22 of relatively large dimensions. Such an implant effectively holds itin place in the capsular sac in efficient manner, avoiding the risks of ejectionthereof out of the capsular sac.
However, such an implant presents certain drawbacks concerning its positioning in the eye. As the implant is made of a supple material such as hydrogel, the implant is introduced in the eye through an incision after this implant has been bent into two, as shown schematically in Figure lb. The bent implant is m~int~ined in this position with the aid of a surgical instrument 24 in 10 the form of forceps, the ends of the arms of the forceps such as 26 presenting three contact or ~ipp~lg points 28, 30 and 32. Due to the presence of the windows 22 in the implant ~ffaçhing elements, the points of contact 28 and 32 ofthe surgical instrument hold the attachment elements of the haptic portion badlyor not at all, in bent form. This results in that they are relatively free during the 15 implantation of the implant in the eye which, on the one hand, renders passage of the implant through the incision made in the cornea more difficult and, on the other hand, risks c~l~sing the contact portions 16 to break.
In addition, it is seen that, as the contact portion 16 has a length greater than that of the diameter of the optical portion 10, the dimensions of the implant 20 once bent still remain relatively large during its passage in the incision made in the cornea.
It is an object of the present invention to provide an intraocular implant made of a flexible material which presents characteristics such that its implantation in the eye, particularly with the aid of the tool defined hereinabove, 25 is facilitated while ensuring the same quality of hold of the implant in the eye after it has been placed in position.
CA 02237318 1998-0~-11 In order to attain this object, according to the invention, the unitOEy intraoculOE implant made of a flexible material OEnd provided with a sub~t~nti~lly circulOE optical portion and a haptic portion consisting of two attachment elements diOEmetrally opposite with respect to said optical portion, each S ~tt~çhment element comprising a contact portion for en~ging the inner wall of the eye, as well as meOEns for connecting said contact portion to the periphery of said optical portion, said contact portions having the shape of OEn OEC of a circle with subst~nti~lly the same centre as the optical portion, is chOEacterized in that the length of the chord adjacent to each contact portion is sub~t~nti~lly the same 10 as the diameter of the optical portion, in that each connecting means consists of a continuous web extending between said contact portion and the periphery of said optical portion, said web being defined by edges having the shape of a curve with regulOE curvature, each curve extending between one end of the contact portion OEnd a point of the periphery of the optical portion, and the distance between the 15 two points on the edges of the web that OEe located on a common line perpendiculOE to the axis of symmetry of the implant in the direction of the ~tt~çhment elements being smaller than the diameter of said optical portion.
It will be understood that, thanks to the fact that the attachment elements OEe continuous, these attachment elements will be well m~int~ined in bent 20 position with the aid of the surgical instrument serving to insert it in the eye. In addition, it will be understood that, thanks to the relatively short length of the contact portions which is of the order of m~pnitllcle of the diOEmeter of the optical portion, the transverse dimensions of the implant once bent is reduced to a maxilllulll since it corresponds subst~nti~lly to half the diameter of the optical 25 portion. Finally, it is seen that, as each web connecting the contact portion to the periphery of the optical portion presents at least one portion of which the width is CA 02237318 1998-0~-11 reduced with respect to that of the contact portion and the optical portion, there is effectively obtained, at the level of each contact portion, an effect of anchoring between the front and rear walls of the capsular sac after the implant has been placed in position, this ensuring hold of the implant in the capsular sac.
According to a prererled form of embo(liment, the optical portion of the implant is limited by two respectively anterior and posterior surfaces in the form of spherical caps each limited by a circle, the circle of the anterior surface presenting a diameter smaller than that of the posterior surface.
It will be understood that this arrangement makes it possible to reduce the 10 thickness of the optical portion in its thickest zone, i.e. that corresponding to its optical axis while m~ g the same curvature of the posterior face of the optical portion. Better bending qualities of the optical portion are thus obtained, due to the reduction of its thickness, while m~ the same quality of contact of the posterior face of the implant on the posterior wall of the capsular 15 sac.
Other characteristics and advantages of the invention will appear more readily from reading the following description of an embodiment of the inventiongiven by way of non-limiting example. The description refers to the accompanying Figures in which:
Figure 1 a, already described, shows a flexible intraocular implant of known type.
Figure lb, already described, illustrates the mode of bending and inserting the implant of Figure l_ in the eye.
Figure 2a is a front view of a flexible implant according to the invention.
Figure 2b is a side view of the implant of Figure 2a, and CA 02237318 1998-0~-11 Figure 3 is a schematic side view of the implant, showing the mode of geometric definition of the attachment elements of the haptic portion of the implant.
T_e general shape of the flexible unitary implant will be described with lerelellce to Figures 2a and 2b. The implant is constituted by a subst~nti~lly circular optical portion 50 and by a haptic portion constituted by two attachment elements 52 and 54 disposed subst~nh~lly diametrally opposite with respect to the optical portion 50. O is the centre of the optical portion, XX' the axis of symmetry of the implant in the direction of the ~tt~hment elements 52, 54 and 10 YY' the second axis of symmetry of the impl~nt. Finally, ZZ' is the axis of revolution of the optical portion of the implant 50. As the two ~tt~çhment elements 52 and 54 are identical, only the attachment portion 52 will be described in detail. The implant is pleI~l ~bly made of hydrogel.
The latter is constituted by a contact portion 56 having the general form of 15 an arc of circle of centre O and diameter Dl . The chord C which is adjacent to the attachment portion 56 has a length subst~nti~lly equal to the diameter D of the optical portion. The edge 56a of the contact portion is rounded in cross section.
The contact portion 56 is connected to the periphery 50a of the optical portion by two assemblies 58 in continuous web form which therefore extend from the 20 periphery 50a of the optical portion up to the contact portion 56. This web is limited by two edges 60 and 62 respectively which each have the shape of a curve presenting a regular curvature. More precisely, each curve defining a contour (sic.) 60, 62 is l~lerelably connected tangentially to the periphery SOa of the optical portion and it is connected by a bent portion 64 to the contact portion 25 56. The variable radius of curvature of the edges 60, 62 is such that, between the contact portion and the periphery of the optical portion, the length l between two CA 02237318 1998-0~-11 points Pl and P2 of the edges of one of the webs 58 is less than the diameter D of the optical portion. Preferably again, the angle at the centre _ corresponding to the two points P'l and P'2 of connection to the periphery 50a of the optical portion is less than 180 degrees but greater than 90 degrees. This angle _ may advantageously be included between 110 and 130 degrees.
As is shown more clearly in Figure 2b, each web 58 presents a thickness which decreases from the contact portion 56 up to the periphery 50a of the optical portion. In addition, it is seen in this Figure that the diameter D2 of the circle limiting the anterior diopter 70 in the form of a spherical cap is smaller than the 10 diameter D3 of the posterior diopter 72 likewlse in the form of a spherical cap.
This difrelence in di~meter makes it possible, thanks to a larger di~meter D3, for the posterior diopter, to ensure a good contact between the posterior wall of the capsular sac while reducing the thickness e of the optical portion along its axis of revolution ZzT.
D2 plerel~bly measures 5.5 mm and D3, 6mm. In addition, the diameter Dl of the haptic portion is equal to 11 mm. The thickness El of the contact portion 56 is included between 0.4 and 0.5 mm, while the thickness E2 of the web in its zone of connection to the optical portion is of the order of 0.2 to 0.25 mm.
Referring now to Figure 3, there will be described the mode of definition of the shape of the attachment elements 52 and 54 (anterior face in the case of Figure 3) is disposed (sic~ on a toric surface portion T shown in broken lines in Figure 3. This portion of torus is defined by the rotation of a circle of centre O' and of radius Rl about the optical axis ZZ' of the implant. During this rotation, 25 the centre O' describes a circle of diameter D4, this circle being centred on axis ZZ' and disposed in a plane orthogonal to this axis. The radius Rl is preferably included between 5 and 30 mm and the diameter D3 is included between 5 and 30 mm.
It should be added that the invention exploits only the properties of flexibility and of pliability of the hydrogel and not its hydrophilic properties. The 5 implant according to the invention may there~l e be produced equally well in another flexible material such as silicone which is also well known for m~kin~
intraocular implants.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Unitary intraocular implant made of a flexible material and provided with a substantially circular optical portion (50) and a haptic portion consisting of two attachment elements (52, 54) diametrally opposite with respect to said optical portion, each attachment element comprising a contact portion (56) for engaging the inner wall of the eye, as well as means (58) for connecting said contact portion to the periphery of said optical portion, said contact portions having the shape of an arc of a circle with substantially the same centre as the optical portion, characterized in that the length of the chord (C) adjacent to each contact portion (56) is substantially the same as the diameter (D) of the optical portion, in that each connecting means (58) has the form of a continuous web extending between said contact portion and the periphery of said optical portion, said web being defined by edges (60, 62) having the shape of a curve with regular curvature, each curve extending between one end of the contact portion and a point of the periphery of the optical portion, and the distance between the two points on the edges of the web that are located on a common line perpendicular to the axis of symmetry (XX') of the implant in the direction of the attachment elements being smaller than the diameter of said optical portion.
2. Implant according to Claim 1, characterized in that said optical portion (50) is limited by two surfaces, respectively anterior (70) and posterior in the form of spherical caps each limited by a circle, the circle of the anterior surface presenting a diameter (D2) smaller than that (D3) of the posterior surface.
3. Implant according to Claim 2, characterized in that the diameter of the circle of the posterior surface is of the order of 6 mm and in that the diameter of the circle of the anterior surface is of the order of 5.5 mm.
4. Implant according to any one of Claims 1 to 3, characterized in that one of the faces of the attachment elements (52, 54) of the haptic portion is defined by a toric surface portion (T) having as axis the axis of revolution of said optical portion.
5. Implant according to any one of Claims 1 to 4, characterized in that each attachment element (52, 54) has a thickness, in the direction of the axis of revolution of the optical portion, which decreases from the contact portion (56)towards the periphery (50a) of the optical portion.
6. Implant according to any one of Claims 1 to 5, characterized in that it is made of hydrogel.
7. Implant according to any one of Claims 1 to 5, characterized in that it is made of silicone.
8. Implant according to any one of Claims 1 to 7, characterized in that the diameter (D1) of the contact portions is of the order of 11 mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9513385 | 1995-11-13 | ||
| FR9513385A FR2740969B1 (en) | 1995-11-13 | 1995-11-13 | FLEXIBLE INTRAOCULAR IMPLANT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2237318A1 true CA2237318A1 (en) | 1997-05-22 |
Family
ID=9484479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2237318 Abandoned CA2237318A1 (en) | 1995-11-13 | 1996-11-07 | Flexible intraocular implant |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0863730A1 (en) |
| JP (1) | JP2000500048A (en) |
| CA (1) | CA2237318A1 (en) |
| FR (1) | FR2740969B1 (en) |
| WO (1) | WO1997017915A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5928282A (en) * | 1997-06-13 | 1999-07-27 | Bausch & Lomb Surgical, Inc. | Intraocular lens |
| AU2004229073B2 (en) * | 1999-07-29 | 2006-09-21 | Bausch & Lomb Incorporated | Intraocular lenses |
| US6685741B2 (en) | 1999-07-29 | 2004-02-03 | Bausch & Lomb Incorporated | Intraocular lenses |
| US9398949B2 (en) * | 2007-01-29 | 2016-07-26 | Emmetropia, Inc. | Intraocular lens system |
| CN103655002A (en) * | 2013-12-13 | 2014-03-26 | 无锡合众信息科技有限公司 | Hydrogel intraocular lens and preparing method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4298996A (en) * | 1980-07-23 | 1981-11-10 | Barnet Ronald W | Magnetic retention system for intraocular lens |
| DE3169818D1 (en) * | 1980-08-05 | 1985-05-15 | Choyce David P | Intraocular lens |
| US4562600A (en) * | 1983-10-18 | 1986-01-07 | Stephen P. Ginsberg | Intraocular lens |
| US4769035A (en) * | 1987-06-02 | 1988-09-06 | Kelman Charles D | Artificial lens and the method for implanting such lens |
| FR2693649B1 (en) * | 1992-07-16 | 1994-10-14 | Corneal | Flexible intraocular implant. |
-
1995
- 1995-11-13 FR FR9513385A patent/FR2740969B1/en not_active Expired - Fee Related
-
1996
- 1996-11-07 JP JP9518617A patent/JP2000500048A/en active Pending
- 1996-11-07 EP EP96938268A patent/EP0863730A1/en not_active Withdrawn
- 1996-11-07 WO PCT/FR1996/001751 patent/WO1997017915A1/en not_active Application Discontinuation
- 1996-11-07 CA CA 2237318 patent/CA2237318A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| FR2740969B1 (en) | 1998-02-13 |
| JP2000500048A (en) | 2000-01-11 |
| WO1997017915A1 (en) | 1997-05-22 |
| EP0863730A1 (en) | 1998-09-16 |
| FR2740969A1 (en) | 1997-05-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |