Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Eye prosthesis – Intraocular lens
Patent
1998-08-14
2000-08-29
Nguyen, Dinh X.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Eye prosthesis
Intraocular lens
623 643, 623 611, 623 614, 623 638, 623 64, A61F 216
Patent
active
061102024
DESCRIPTION:
BRIEF SUMMARY
The present invention has for its object an intraocular implant for correcting short-sightedness.
More precisely, the invention has for its object an intraocular implant for correcting short-sightedness which is intended to be positioned in the posterior chamber of a phakic eye, i.e. an eye of which the lens was not removed during an operation for ablation of the cataract.
Two important types of intraocular implant intended for correcting short-sightedness can be cited. In the first type of implant, the latter is intended to be positioned in the anterior chamber of the eye. In accompanying FIG. 1, a human eye has been shown in horizontal section, comprising therefore the cornea 10, the iris 12 with the pupil 14 and the lens 16 contained in the capsular sac 18 itself joined by zonulas 21 on the inner wall of the eye.
Conventionally, anterior chamber 20 designates the space inside the eye which extends between the cornea 10 and the iris 12. On the other hand, posterior chamber designates 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-sightedness, 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 reduced dimensions of the anterior chamber, there is therefore a real risk of the edge of the optical portion of the implant, positioned in the anterior chamber, traumatizing the inner face of the cornea 10. Such traumatism may have serious consequences since the cells of the inner face of the traumatized cornea cannot regenerate and this affliction 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 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 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 desired or necessary accommodation, the shape of the lens 16 and in particular its anterior face 16a and therefore 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 chamber, the implant is subjected to effects of pressure resulting from the aqueous humor and the vitreous humor present in the anterior chamber and the posterior chamber and external pressures which may be applied to the whole of the eye. It is necessary that, under the effect of these different 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 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 the implant in place in the posterior chamber.
To attain this object, the posterior-chamber intraocular implant for correcting short-sightedness in a ph
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Barraquer Joaquin
Bos Gilles
Corneal Laboratoires
Nguyen Dinh X.
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