Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Eye prosthesis – Intraocular lens
Patent
1985-09-05
1987-12-01
Apley, Richard J.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Eye prosthesis
Intraocular lens
A61F 216
Patent
active
047101962
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a National Phase corresponding to PCT/BG85/0001, filed Jan. 4, 1985 and based, in turn, upon a Bulgarian application 63804 filed Jan. 5, 1984 under the International Convention.
This invention relates to an intraocular crystalline lens and can be used in medicine for intraocular correction of operational aphalsia after extraction of the opaque natural crystalline lens.
BACKGROUND OF THE INVENTION
An intraocular crystalline lens is known (see U.K. Pat. No. 2,118,841) which comprises a lenticular body with frontal and lateral apertures which are parallel to one another. The lenticular body is connected with two identical elastic asymmetric elements which are symmetrically disposed with respect to the center of the body, these elements extending from the lenticular body for contact with the supporting eye surface. The asymmetric elements have two parallel extreme parts, the ends of which are inserted in the lateral apertures of the lenticular body. Each elastic element consists of three consecutively connected sectors of which the middle one is supporting and the remaining two are connecting. The supporting sector consists of two steps which are separated by a concave arc.
A disadvantage of the known crystalline lens is the small length and the low elasticity of the connecting sectors which determine the total elasticity of the asymmetric element. Another shortcoming is that the two connecting sectors have a different elasticity and the supporting sector hence is not pressed equally on both sides to the supporting eye surface so that in the one step is obtained a greater pressure. This leads to damages to the supporting eye tissues, loss of cellules and decentrating of the crystalline lens in the eye.
OBJECT OF THE INVENTION
The object of the invention is to provide an intraocular crystalline lens which is stable, easily implanted, readily centered and which also has supporting elements which are of high elasticity.
SUMMARY OF THE INVENTION
This object is attained by an intraocular crystalline lens comprising a lenticular body with parallel frontal and lateral apertures whereby the lenticular body has two identical elastic asymmetric elements symmetrically disposed in respect of the center of the body and extending from the lenticular body for contact with a supporting eye surface. The elements each have two parallel straight extreme parts whose ends are inserted in the lateral apertures of the lenticular body whereby each elastic asymmetric element is composed of three adjoining sectors in succession, the middle sector being supporting while the other two are connecting.
According to the invention the supporting sector consists of a widening or bight and a supporting curve. The widening comprises an arc with a radius from 0.30 to 0.90 mm while the supporting curve is so formed that it can be engaged in an enveloping circumference with radius R equal to the radius of the supporting eye surface. The enveloping circumference is intersected by a concentric to the periphery of the lenticular body circumference with radius R equal to the radius of the enveloping circumference whereby between the plotted tangents to these circumferences through their point of intersection is formed an angle alpha from 1.5.degree. to 7.5.degree. and so that the connecting sectors have an equal easticity.
The supporting curve is formed by an arc with radius R equal to the radius of the supporting eye surface.
The supporting curve is formed as wavy and has at least two concave and convex parts.
The connecting sectors have the same form comprising an arc, the one end of which is connected with the supporting sector and the other--with the straight extreme part of the elastic element whereby both parallel extreme parts of the elastic element are disposed in one quadrant.
One of the connecting sectors has an elastic part composed of an elastic arc with central angle greater than 170.degree.. This elastic arc is connected is connected by means of arms respectively with
REFERENCES:
patent: 4328595 (1982-05-01), Sheets
patent: 4435855 (1984-03-01), Pannu
patent: 4502162 (1985-03-01), Gerhard et al.
patent: 4503570 (1985-03-01), Grendahh
patent: 4588405 (1986-05-01), Nuolle
patent: 4610689 (1986-09-01), Graether
American Medical Optics PC-80 Style Sheet, Sep. 1982.
Benchev Dimiter V.
Dyakov Nikola G.
Guguchkova-Yanchuleva Pravoslava T.
Apley Richard J.
Dubno Herbert
Prizant James
Ross Karl F.
V T P "Maimex"
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