Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Eye prosthesis – Intraocular lens
Patent
1986-04-04
1987-02-10
Frinks, Ronald L.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Eye prosthesis
Intraocular lens
A61F 216
Patent
active
046421157
DESCRIPTION:
BRIEF SUMMARY
This application is based on International Application PCT/SU 84/00047 filed Aug. 16, 1984.
TECHNICAL FIELD
The present invention relates generally to medicine and more specifically to ophthalmology, having particular reference to an artificial eye lens.
PRIOR ART
It is common knowledge that surgical treatment of various eye diseases necessitates very frequently the removal of the crystalline lens (lensectomy) followed by its substitution with an artificial (intraocular) lens. As a rule, the majority of such artificial lenses need further suturing of the supporting elements to the iris, which is in fact a rather complicated surgical intervention, especially when the lens is to be fixed to the inferior portion of the iris. This operation is fraught with possible dislocation of the lens when the pupil is being dilated, which may be the case if the lens is introduced through a puncture in the iris as it is known, e.g., from USSR Inventor's Certificate No. 545,352, wherein an artificial lens provides for the presence of a lens and supporting legs outside the pupillary area, and the lens has at least one loop-shaped leg to pass a suture attaching the lens to the iris.
With a view to attaining a simplified artificial lens implantation technique and its more reliable fixing, another artificial eye lens has been devised, described in USSR Inventor's Certificate No. 858,819. In such an artificial lens the top loop-shaped leg is in effect composed of two lugs arranged oppositely each other in a horizontal plane of the lens in its top portion, and the plane of said loop-shaped leg is offered at an angle of from 5 to 8 degrees with the plane of the lens so as to establish springiness. A bottom supporting leg is also provided.
A disadvantage inherent in the aforesaid known artificial lens resides in the fact that it involves the formation of a large incision (up to 4 mm long) in the top portion of the iris followed by application of a Supramide (R) suture, which prolongs substantially the operative time and offers additional technical difficulties during the lens implantation. Moreover, a possibility cannot be ruled out for the pupil deformation and enlargement of the incision as a result of the suture cutting through thinned distrophically changed structures resulted from a prolonged compression of the iridal tissues. This in turn may lead not only to dislodging but also to off-centring of the artificial eye lens. In addition, such an artificial eye lens may rather frequently be the cause of an inflammatory reaction of the eye due to forceful interaction of the lens supporting elements with the eye tissues rich in blood vessels and nerves.
ESSENCE OF THE INVENTION
It is an essential and primary object of the present invention to provide the supporting elements of an artificial eye lens made in such a manner as to ensure simple and convenient implantation of the artificial lens, render the operative techniques simpler, attain more reliable attachment of the eye lens and make the operation less traumatic.
The aforesaid object is accomplished due to the fact that in an artificial eye lens, comprising a lens proper and three supporting elements, one of which is formed as a loop and the two other are arranged at the same side of the lens oppositely to said loop-shaped element, according to the invention, each of the two elements situated on the same side of the lens is shaped as a V-shaped leg fastened on the lens anterior surface with one of the ends of its one side, and due to the fact that the sides of the V-shaped legs diverge along the lateral lens surface and are inclined towards the posterior surface of the lens in such a manner that the other sides of said legs are situated in the lens principal plane and faces each other with the vacant ends of the legs.
An advantageous feature of such an artificial eye lens consists in that large incisions in the iris are no longer necessary due to the aforesaid orienting of the two V-legs made fast on the anterior lens surface, since no necessity arises for passing the
REFERENCES:
patent: 3673616 (1972-07-01), Fedorov
patent: 3922728 (1975-12-01), Krasnov
patent: 4242760 (1981-01-01), Rainin
patent: 4316292 (1982-02-01), Alexeev
patent: 4366582 (1983-01-01), Faulkner
patent: 4437194 (1984-03-01), Hahs
patent: 4536895 (1985-08-01), Bittner
patent: 4579557 (1986-04-01), Fedorov et al.
Frinks Ronald L.
Kievsky Nauchno-Issledovatelsky Institut Klinicheskoi I Experime
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