Tekia accommodating intraocular lens
Passive-shift single-optic lenses, the only accommodative lens currently marketed, were designed to move forward under ciliary muscle contraction. More recently, a lens systems that employs an active-shift mechanism using repulsive mini-magnets as a means of making accommodation partially independent of the zonules and mechanical properties of the capsular bag was disclosed (see U. Briefly, the present invention provides an intraocular lens system and method for improving accommodation that remedies the loss of axial and centrifugal movement caused by shrinkage and loss of flexibility of the capsular bag following implantation of conventional lens systems.
Accommodation in these systems, however, remains limited by the loss of elasticity in the post-fibrotic capsule. A lens system of the present invention includes a flexible optic holder comprising a plurality of zonular capture haptics, in particular, regularly-spaced haptics that are adapted to allow or facilitate fusion of the capsular bag following placement of the optic holder within the capsular bag and ultimately to permit the sectioning of the fused capsular disc.
Unless it is already an integral part of the zonular capture haptic, the optic of the lens system may be inserted into the haptic during a second stage of the procedure.
Any mechanical means or chemically-induced tensioning or positioning of the haptic/optic complex, which may have been employed to control the accomodative state of the haptic-lens complex during the fusion and contraction of the healing capsular bag would be removed at this juncture.
The haptics of the optic holder are designed to allow maximum fusion of the anterior and posterior leaves of the capsular bag following placement of the optic holder in the capsular bag. Unfortunately, conventional IOLs, even those that profess to be accommodative, may be unable to provide sufficient spatial displacement of the lens along the optical axis to provide an adequate amount of accommodation for near vision.
Following introduction of the optic holder into the capsular bag, the natural or assisted process of fibrosis/fusion of the capsular bag occurs, thereby sealing and securely capturing the haptics within the capsular bag. Non-provisional application that claims the priority of U. In conventional extracapsular cataract surgery, the crystalline lens matrix is removed by phacoemulsification through a curvilinear capsularhexis leaving intact the thin walls of the anterior and posterior capsules, together with zonular ligament connections to the ciliary body and ciliary muscles.
The present invention provides an accommodative intraocular lens (AIOL) system and method for improving accommodation with an intraocular lens. The contraction of the ciliary muscle releases zonular tension (accomodative state) and allows the lens to alter to a more globular or spherical resting shape.
Apposition of the anterior and posterior leaves of the capsule to facilitate fusion may also be achieved by introduction of an air bubble anterior to the capsular bag.The restored elasticity of the present accomodative IOL system, which allows the optic to return to a resting state when zonular tension is released, is provided by angulated haptics which straighten under zonular tension, by the elasticity of the optic or a combination of both.