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
  • A61F2/1613—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

Definitions

• the present invention relates to a flexible monobloc intraocular implant.
• intraocular implants can be classified into two main categories depending on the nature of the material with which they are made.
• rigid intraocular implants which are most often made using PMMA or derived products and in which the elasticity of the haptic part of the implant is obtained by giving it a form allowing its elastic deformation.
• flexible intraocular implants which are manufactured with a material which is most often a hydrophilic acrylic or a silicone-based compound.
• the essential advantage of flexible intraocular implants is that, for their introduction into the eye, the optical part which is itself flexible can be folded, which allows the implantation in the eye of the system to through a comedian incision of reduced size.
• new techniques for lens ablation exist, in particular phacoemulsification, which require only the making of a coma incision of precisely reduced size, of the order of 3.5 mm.
• the optical part is folded in half according to one of its diameters. It is desirable that, during this folding, the behavior of the haptic part is such that the overall size of the folded intraocular implant is not greater in the direction orthogonal to the folding diameter than half the diameter of the implant. It is also desirable that the general shape of the folded implant, including its haptic part, promotes and facilitates the placement of the implant in the eye and more precisely in the capsular bag.
• haptic part made of flexible material are very significantly different of course from those of haptic parts made of rigid material such as PMMA.
• haptic parts made of rigid material such as PMMA.
• intraocular implants made of flexible material have a relatively massive haptic part which often consists of two symmetrical portions which ensure by their periphery a significant length of contact between the ends of the haptic parts and the internal wall of the eye. or the capsular bag.
• Such a configuration of the haptic parts ensures correct centering of the optical part of the implant in the eye.
• An object of the present invention is to provide a flexible monobloc intraocular implant which, while ensuring correct centering and holding of the optical part inside the eye, avoids the phenomenon of arching and therefore of axial displacement of the optical part and which, moreover, in a folded state, has a general shape which favors the insertion of the folded implant into the eye.
• the monobloc intraocular implant made of a flexible material comprising a substantially circular optical part and a haptic part constituted by two haptic assemblies arranged symmetrically with respect to a first diameter of the optical part, is characterized in that each haptic assembly comprises two haptic members symmetrical to one another with respect to a second diameter of the optical part orthogonal to the first diameter, each haptic member being arranged in the plane of the optical part and comprising two arms, each arm having a first end connected to the periphery of the optical part and a second end, and a substantially straight contact portion, the ends of which are connected to the second ends of said arms, the arms of the haptic organs not being arranged in radii of the optical part, the four contact portions é both substantially tangent to the same circle concentric with the optical part.
• the assembly constituted by the four organs haptics remains in the optical plant of the intraocular implant, which makes it possible to avoid any arching phenomenon and therefore displacement of the optical part.
• the two haptic organs are symmetrical with respect to the diameter YY ′ of the optical part which is the folding diameter of the implant, these two haptic organs are superposed after folding thus facilitating the insertion of the implant into the eye through an incision reduced size.
• FIG. 1 is a front view of the intraocular implant
• FIG. 2 is a side view of the implant of Figure 1;
• FIG. 3 is a front view of the folded implant
• FIG. 5 is a view of the intraocular implant placed in the capsular bag and which shows the deformations of the haptic part. Referring first to Figures 1 and 2, we will describe a preferred embodiment of the intraocular implant.
• the implant which is, as already indicated, monobloc and entirely made of a so-called flexible material of the hydrophilic acrylic type or composed of silicone and constituted by an optical part 10 of substantially circular shape having a periphery 10a and by a part haptic which is constituted by two haptic assemblies respectively referenced 12 and 14 and arranged symmetrically with respect to a first diameter XX 'of the optical part.
• Each haptic assembly 12 and 14 is constituted by two haptic bodies referenced 16 and 18 for the haptic assembly 12.
• the haptic assemblies 12 and 14 being identical, only the haptic assembly 12 will be described in detail.
• the haptic organs 16 and 18 of the haptic assembly 12 are symmetrical with respect to the optical diameter YY ′, this diameter being orthogonal to the first of the diameters XX ′ and constituting the folding diameter of the intraocular implant with a view to its placement in the eye.
• the haptic member 16 we see that it consists of two substantially straight arms 20 and 22 which extend from a first end 20a connected to the periphery 10a of the optical part 10 at one end terminal 20b. The same goes for the arm 22 which has the ends 22a and 22b. It is important to observe that the mean line of the arms 22 and 20 is not disposed along a radius of the optical part 10.
• the haptic member 16 is completed by a contact portion 24 whose ends are connected to the ends 20b and 22b arms 20 and 22.
• a structure which has the general form of a parallelogram constituted by the periphery of the optical part 10, the arms 20 and 22 and the contact portion 24. This form of parallelogram naturally surrounds a recess 26.
• the contact portion 24 and the arms 20 and 22 have a width e which is between 40 and 50 hundredths of a millimeter and preferably equal to 45 hundredths of a millimeter .
• the contact portions 24 of the four haptic organs are substantially arranged tangentially to a circle of diameter Dl concentric with the optical part 10.
• the outer edges 24a of the contact portions 24 are arranged substantially tangentially to the circle of diameter Dl.
• the angle at the center a corresponding to the radii RI and R2 is less than 90 °.
• it is of the order of 60 °. It is understood that thus the two haptic organs of the same haptic set are closer to each other than are the corresponding haptic organs belonging to two different haptic sets.
• the outer edge 20c of the outer arm 20 of a haptic member is connected substantially tangentially to the periphery 10a of the optical part and is substantially arranged on the same arc of a circle as the outer edge 20'c of the arm 20 ' of the haptic organ 16 '. It can also be seen that the portion 10b of the periphery of the optical part between the haptic members 16 and 18 of the same haptic assembly has a recess 32 symmetrical with respect to the folding diameter YY 'and which is connected continuously to the leaves 30 arms 22.
• the haptic organs have a thickness h in a direction orthogonal to the optical plane which increases slightly from the end 20a of an arm 20 to the end 20b of this same arm corresponding to the contact portion.
• the thickness h near the periphery of the optical part is for example 0.22 mm while the thickness h 'of the contact portions is equal to 0.30 mm.
• the arms of the haptic organs have a greater width than the current part of the arm, this width being defined by connecting leaves 28 and 30. It is understood that, thanks when these leaves 28 and 30 are present, the portions of limited length of the arms corresponding to these leaves define an embedding zone when forces are applied to the haptic organs.
• FIG. 3 shows the deformation of the haptic part when the implant is placed in the capsular bag 40.
• the capsular bag has a diameter D 2 less than the diameter Dj of the implant, the four haptic organs are subjected to a elastic deformation. Under the effect of this constraint, the haptic organs deform in such a way that their contact zones 24 slide on the wall of the capsular bag in the direction of the arrows F and F, tending to move away, the haptic organs behaving substantially like deformable parallelograms. As a result, the deformed haptic members remain in the plane of the optical part 10.

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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)

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• 1997
  • 1997-08-01 FR FR9709862A patent/FR2766699B1/fr not_active Expired - Fee Related
• 1998
  • 1998-07-30 EP EP98941494A patent/EP0999807A1/de not_active Withdrawn
  • 1998-07-30 WO PCT/FR1998/001693 patent/WO1999005993A1/fr not_active Application Discontinuation

Non-Patent Citations (1)

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