Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Eye prosthesis – Intraocular lens
Patent
1988-06-08
1989-09-05
Frinks, Ronald L.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Eye prosthesis
Intraocular lens
A61F 216
Patent
active
048634620
DESCRIPTION:
BRIEF SUMMARY
This application claims priority from International Application PCT/SU86/00109, filed Oct. 29, 1986.
FIELD OF THE INVENTION
This invention relates to prosthetic devices and to means for their attachment to the human body and more specifically it concerns posterior-chamber intraocular prosthetic lenses.
PRIOR ART
It is common knowledge that surgical treatment of various eye diseases is not infrequently encountered with a necessity for removal of the crystalline lens followed by its substitution by a prosthetic lens or lenticulus, otherwise called intraocular lens. As a rule, the process of implantation of the prosthetic lenses into the posterior eye chamber is impeded due to such complications as rupture of the posterior lenticular capsule and vitreoptosis.
Known in the present state of the art is an intraocular lens by Shearing (cf, the Journal of the American Academy of the Ophthalmology, 1982, V.89, No. 8S, p. 128), comprising an optical lens and two diametrically opposite supporting elements that lie in a plane coplanar with the lens principal plane. However, said intraocular lens is difficult to implant, since insertion of the supporting elements in the slitlike posterior eye chamber is frequently liable to result in formation of folds of the posterior chamber, which in turn lead to rupture of the posterior lenticular capsule in the course of implantation. Thus, eye irrigation has to be resorted to. This, consequently prolongs the operating time, renders the surgical procedure less convenient, and contributes to a greater amount of corneal edema resulting from the effect of the irrigation fluid on the eye being treated. All this extends the postoperative treatment of the patients operated upon. Moreover, the aforementioned arrangement of the supporting elements fails to prevent the implanted intraocular lens from dislocation within the postoperative period.
Another intraocular lens by Pierce (cf. The Journal of the American Academy of Opthalmology, 1982, V.89, No. 8S, p. 130) comprises an optical lens and three radially arranged supporting elements coplanar with the lens principal plane. The intraocular lens is also to be inserted in the posterior eye chamber. To this end, the lens is introduced with one of its supporting elements into the posterior eye chamber, while the other two supporting elements are inserted by displacing the iris and putting over said elements. Such a procedure is also accompanied rather frequently by rupture of the posterior capsule, since when implanted in the posterior eye chamber, the flat supporting element moves towards the posterior lenticular capsule with an edge at a certain angle thereto. Thus, the edge of the supporting elements rests against the capsule and might injure the latter when being moved further on. Besides, arrangement of the supporting elements coplanarly with the lens principal plane results in the lens being liable to dislocate with respect to the visual axis rather frequently, thus affecting eyesight adversely. Furthermore, reliably holding of the intraocular lens needs application of an additional suture fixing the lens to the iris. This extends the operating time and renders the surgical procedure more traumatic which, eventually, results in a longer postoperative period of patients' rehabilitation.
ESSENCE OF THE INVENTION
It is a primary and essential object of the invention to provide a posterior-chamber intraocular prosthetic lens, wherein the shape of supporting elements would prevent postoperative complications.
Said object is accomplished due to the fact that in a posterior-chamber intraocular prosthetic lens, comprising an optical lens and at least two diametrically opposite supporting elements, according to the invention, each of the supporting elements is in fact a curvilinearly
shaped body, one of its lateral surfaces being convex and facing with its convex portion oppositely with respect to the lens principal plane, and the other lateral surface of said body is concave and faces with its concave portion towards the lens principal
REFERENCES:
patent: 4092743 (1978-06-01), Kelman
patent: 4159546 (1979-07-01), Shearing
patent: 4418431 (1983-12-01), Feaster
patent: 4588405 (1986-05-01), Knolle, Jr.
patent: 4601721 (1986-07-01), Kamerling
patent: 4610689 (1986-09-01), Greather
The Journal of The American Academy of Opthalmology, pp. 128-130, (Vol. 89, o. 8S, August Supplement, 1982).
Anisimov Sergei I.
Degtev Evgeny I.
Fedorov Svyatoslav N.
Juzhelevsky July A.
Karavaev Alexandr A.
Frinks Ronald L.
Mezhotraslevoi Nauchno-Tekhnichesky Komplex "Mikrokhirurgii Glaz
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