CN201015617Y

CN201015617Y - High-efficiency bimirror type adjustable artificial crystalline lens

Info

Publication number: CN201015617Y
Application number: CNU2007201406380U
Authority: CN
Inventors: 林瑞腾
Original assignee: NEW VISION Inc
Current assignee: NEW VISION Inc
Priority date: 2006-12-30
Filing date: 2007-03-19
Publication date: 2008-02-06
Anticipated expiration: 2017-03-19

Abstract

The utility model relates to a double-spectacle lens adjustable artificial lens comprising a front spectacle lens, a rear spectacle lens and support legs. Two supported legs are provided and respectively arranged and upper and lower end of the front spectacle lens and the rear spectacle lens and each support leg has two extending connection sections respectively connected with ends of the front spectacle lens and the rear spectacle lens; the artificial lens and the support legs are made of plastic variant materials. Relative displacement of the front spectacle lens and the rear spectacle lens of the double-spectacle lens adjustable artificial lens provided by the utility model generates 'adding' effect or the maximum adjustability A. The maximum A can be 2 to 5 times of prior single-spectacle lens adjustable artificial lens. Best matching relationship between the front spectacle lens and the rear spectacle lens is determined by relative displacement and structure hereof jointly.

Description

High efficiency bimirror formula accommodating intraocular lens

Technical field

This utility model relates to a kind of Ophthalmologic apparatus, especially a kind of bimirror formula accommodating intraocular lens in order to treatment postcataract and presbyopia patient vision (Accommodating Intraocular Lens is called for short AIOL).

Background technology

Presbyopia (being commonly called as the presbyopia) is to increase the eyeball variation that causes because of the age.Its possible therapeutic modality contains wears presbyopia's glasses or bi-focal glasses and operation method such as peripapillary scleral ectasia art (SEB) and ciliary muscle excision.For the presbyopia treatment of postcataract, accommodating intraocular lens (AIOL) also is one of to select.The AIOL that provides in the market all uses single mirror (single-optics), and bimirror formula (dual-optics) AIOL does not then have actual clinical as yet.Though the notion of bimirror formula AIOL has Sarfaraz (United States Patent (USP) 5,275,623,1994) and Cumming (United States Patent (USP) 6,197,059,2001), Tran (United States Patent (USP) 6,616,691,2003) etc. the people proposes, and existing product is made by German Human Optics company, but owing to lack correct theory and specific design formula, its degree of regulation (Accommodating amplitude is hereinafter to be referred as " A ") all fails to reach the requirement of practical value, and the A value needs at least more than the 3.0D diopter (diopter).For the presbyopia patient, require the A value of AIOL be required to be on the occasion of, and implant AIOL for child's postcataract, then require " bear " A value could compensate the myopia that in the future produces and move because of the axis oculi growth.

Summary of the invention

The purpose of this utility model is to improve the deficiency of existing theory and design, a kind of high efficiency bimirror formula accommodating intraocular lens (AIOL) is provided, produce positive A value at 3D between the 10D, for 1.5 to 5 times of existing product and produce negative A value-2.0D and arrive-6.0D, this is not had by existing product.

The purpose of this utility model is achieved in that

A kind of bimirror formula accommodating intraocular lens, it comprises preceding mirror, back mirror and leg, and described leg is two, is located at the two ends up and down of described preceding mirror and back mirror respectively, and each leg has two connecting portions that stretch out, and it is connected with the end of preceding mirror with the back mirror respectively; Described intraocular lens and leg thereof are that plasticity modification material is made.

In use, described leg engages with the cornice (capsular bag) of the former lens of postoperative.When ciliary muscle contraction, apart from increasing, and then produce the visual accommodation effect between the mirror of front and back, reach required A value, this value can be plus or minus, is decided by the refractive power and the moving direction thereof of front and back mirror.

This novel lens design principle is a basis woods formula new formula what follows: (referring to Fig. 1).

A=M (dS1)+M ' is equation (1) (dS2)

M＝(P1/P)Mo-C，M’＝(P2/P)Mo，

Mo＝(Z/1336)(2Pc+ZP)，

C＝Z2(P1P2/1336)，

Z＝1-S(Pc/1336)，

Wherein every symbolic representation:

DS1 and dS2: before and after being respectively eyeglass move axially distance, moving forward is positive sign, after move and be negative sign.

P1 and P2: the refractive power of eyeglass before and after being respectively

P: be total dioptric power, P=P1+Z ' P2, Z '=1-d ' is (P1/1336).

Pc: be corneal refractive power

S: be preceding mirror and cornea coverage, S=d+ (P2/P) d '

D: be the spacing of preceding mirror and cornea

D ': be the front and back mirror spacing

Above-mentioned formula provides two kinds of optimal design modes;

For positive A value: require P1＞0 (dS1＞0) and P2＜0 (dS2＜0)

For negative A value: require P1＜0 (dS1＜0) and P2＞0 (dS2＞0)

The bimirror formula accommodating intraocular lens that this utility model provides is based on above-mentioned new design formula, the advantage that has is: this optimal design is based on shown in the equation (1), for a certain specific AIOL total dioptric power (P), the M value is proportional to P1, or P-Z ' P2, therefore, more negative P2 value produces bigger M value, and by parity of reasoning, is worth its " addition " effect for reaching M and M ', then require dS2＜0. (when P2＜0), to reach M ' (S to)＞0.Satisfying above-mentioned (a) or (b) during condition, front and back mirror relative displacement produces " addition " effect or maximum A value.This maximum A value can be 2 to 5 times of existing single mirror AIOL.The matching relationship of mirror is determined simultaneously by its relative displacement and both structures before and after this best.

These novel the above characteristics, if it is there is not above-mentioned design formula, then unpredictable.This also is that prior art is inaccessible.Above characteristics can be further clear and definite in following specific embodiment.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing.

The AIOL schematic diagram that Fig. 1 provides for this utility model (positive A and negative A);

The AIOL structural representation that Fig. 2 provides for this utility model;

The sketch map that mirror moves before and after can be respectively before and after among the AIOL embodiment 3 that Fig. 3 A provides for this utility model;

Mirror reach before among the AIOL embodiment 3 that Fig. 3 B provides for this utility model, the sketch map that back mirror is motionless;

The different structure sketch map that Fig. 4 A-4F provides for this utility model for lens in the bimirror formula accommodating intraocular lens, Fig. 4 A is a biconvex lens structure, Fig. 4 B is the planoconvex lens structure, protruding 4C is the saturating combinative structure of convexo-convex, Fig. 4 D is the biconcave lens structure, Fig. 4 E is the planoconcave lens structure, and Fig. 4 F is concavo-concave lens arrangement.

The specific embodiment

Embodiment 1:

As shown in Figure 1, a kind of bimirror formula accommodating intraocular lens (AIOL), it comprise before mirror 1 and after

Mirror 2, the distance of front and back lens are d ', and the distance of preceding mirror 1 and cornea 3 is d.This intraocular lens makes the patient imaging point 4 can be fallen on the retina by ciliary muscle contraction.

But described intraocular lens makes for retrospective modification material, for example uses polymethyl methacrylate (PMMA), and acryl (Acrylic, acrylic fiber) or silicon (Silicon) are made.

Before mirror be positive refractive power (P1＞0), between+the 60D, optimum 30D is to 60D at+15D.Back mirror is negative refractive power (P2＜0), and optimum-20 arrives-10D.Before mirror to reach (being dS1＞0), back mirror should be motionless or be moved (dS2＜0) backward, should avoid to reach simultaneously, so situation causes and subtract each other effect, lowers efficiency, specifically principle is seen embodiment 3.Under said structure, for example, for moving apart from dS1+dS2=1.5mm, calculate according to new formula, can reach degree of regulation A=3D to 10D, this is worth than general single mirror IOL (the about 2D of A value), exceeds 2 to 5 times, for reaching clinical practice, the variable quantity of front and back mirror distance or its displacement are between 0.5 to 2.0mm.

Embodiment 2:

Structure as shown in Figure 1, and is still opposite with embodiment 1, and preceding mirror is negative refractive power (P1＜0), and to-5D, optimum-30D is to-10D at-40D.Back mirror is positive refractive power (P2＞0), and optimum+20 are arrived+40D.Preceding mirror is to reach (being dS1＞0), and back mirror can move (dS2＜0) motionless or backward.Under said structure,, can reach degree of regulation A=-2.0D and arrive-6.0D for moving apart from dS1+dS2=1.5mm.

Embodiment 3:

The bimirror formula accommodating intraocular lens (AIOL) that being illustrated in figure 2 as this utility model provides is implanted the structure chart in the eye, and front and

back mirror

13,14 respectively has a pair of leg 15, and this leg is connected the usefulness as the fixed position with end 16 before the former crystalline lens cornice 10.The angle 18,19 that two legs and front and back mirror respectively are is about 30 to 90 degree.When ciliary muscle above-below direction arrow as shown in Figure 3A shrank, mirror moved front and back respectively before and after Fig. 3 A performance, and mirror reach before Fig. 3 B performance, back mirror is motionless, because of about 90 degree of its leg angle.Above-mentionedly either way can reach positive A value.Mirror can be biconvex before described being somebody's turn to do, plano-convex or convexoconcave lens (shown in Fig. 4 A, 4B and 4C), and back mirror can be concave-concave, plano-concave or concavo-convex (shown in Fig. 4 F, Fig. 4 E, Fig. 4 D).This intraocular lens and leg materials used can be the plasticity chemical material and are illustrated in figure 2 as bimirror formula accommodating intraocular lens (AIOL) that this utility model provides and implant structure chart in the eye, front and

back mirror

13,14, a pair of leg 15 is respectively arranged, be with 10 end 16 to be connected behind this leg and the crystalline lens.The angle 18,19 that two legs and front and back mirror respectively are is about 30 to 90 degree.When ciliary muscle contraction, mirror moves front and back respectively before and after Fig. 3 A performance, and mirror reach before Fig. 3 B performance, back mirror is motionless, because of about 90 degree of its leg angle.Above-mentionedly either way can reach positive A value.Mirror can be biconvex before described being somebody's turn to do, plano-convex or convexoconcave lens (shown in Fig. 4 A, 4B and 4C), and back mirror can be concave-concave, plano-concave or concavo-convex (shown in Fig. 4 F, Fig. 4 E, Fig. 4 D).Materials used can be the plasticity chemical material, comprises polymethyl methacrylate (PMMA), acryl (acrylic fiber, acrylic) or silicon (silicon).

Embodiment 4:

Present embodiment is similar to embodiment 3, but the front and back mirror changes over, promptly before mirror be negative refractive power, back mirror is a positive refractive power, under this structure, produces and bears the A value.

Claims

1. bimirror formula accommodating intraocular lens, it is characterized in that: comprise preceding mirror, back mirror and leg, described leg is two, is located at the two ends up and down of described preceding mirror and back mirror respectively, each leg has two connecting portions that stretch out, and it is connected with the end of preceding mirror with the back mirror respectively; Described intraocular lens makes for plasticity modification material.

2. bimirror formula accommodating intraocular lens according to claim 1 is characterized in that: mirror is the lens of positive diopter before described, and described back mirror is negative dioptric lens.

3. bimirror formula accommodating intraocular lens according to claim 2 is characterized in that: mirror is positive refractive power P1＞0 before described, and diopter is D at least+15, arrives between+60 D at+15 D; Described back mirror is that negative refractive power-10 is to-20 D.

4. bimirror formula accommodating intraocular lens according to claim 3 is characterized in that: the mirror diopter is that 30 D are to 60 D before described.

5. bimirror formula accommodating intraocular lens according to claim 1 is characterized in that: mirror is negative dioptric lens before described, and described back mirror is the lens of positive diopter.

6. bimirror formula accommodating intraocular lens according to claim 5 is characterized in that: described back mirror is a positive refractive power, D at least+20, or+20 to+40 D; Mirror is a negative refractive power before described, and diopter arrives-5 D at-40 D.

7. bimirror formula accommodating intraocular lens according to claim 1 is characterized in that: the angle that the upper and lower side horizontal direction of two described legs and described front and back mirror respectively is is 30 to 90 degree.

8. bimirror formula accommodating intraocular lens according to claim 1 is characterized in that: the variable quantity of distance is between 0.5 to 2.0 millimeter between the mirror of described front and back.

9. bimirror formula accommodating intraocular lens according to claim 1 is characterized in that: described should preceding mirror be biconvex, plano-convex or convexoconcave lens, and described back mirror is concave-concave, plano-concave or meniscus.

10. bimirror formula accommodating intraocular lens according to claim 1 is characterized in that: described intraocular lens and a pair of leg thereof are PMMA or acryl by polymethyl methacrylate, and promptly acrylic fiber or silicon materials are made.