APPARATUS FOR INJECTION MOULDING AN INTRAOCULAR LENS DEVICE

Description

Background of the Invention

[0001] The present invention relates to injection molding and more particularly relates to novel apparatus and methods for liquid injection molding an intraocular lens ("IOL"). Intraocular lenses having a single optic have been known and used for many years. IOL manufacturing has included cast molding, lathing and liquid injection molding (LIM). In the LIM technique, a cold liquid lens material, for example a premixed two-part liquid silicone, is injected into a heated mold cavity of the desired configuration and allowed to cure and harden. While LIM is a cost-effective technique for making intraocular lenses, improvements could be made to various aspects thereof such as, for example, surface finishes and gating designs that do not create unwanted knit lines, gate vestiges and the like.

[0002] More recently, accommodating intraocular lens devices having two optics interconnected by one or more haptics have been disclosed in the following U.S. patents and applications to Faezeh Sarfarazi. US 5,275,623 "Elliptical Accommodative Intraocular Lens For Small Incision Surgery";
US 6,423,094 "Accommodative Lens Formed From Sheet Material";
US 6,488,708 "Open Chamber Elliptical Accommodative Intraocular Lens System";
USSN 10/445,762 filed on 5/27/03 entitled "Mold for Intraocular Lens".

[0003] The Sarfarazi accommodating lens device includes two optics, one negative and the other positive for placing in the evacuated lens capsule of an eye. The optics are interconnected along their peripheries by one or more haptics which space the optics from each other and assist in properly positioning the device in the eye. The haptics are formed from a flexible material such that they may flex in response to forces exerted by the eye's ciliary muscles which control accommodation. The haptics will thus flex and bow further radially outwardly upon a compressive force being applied to the device, whereby the two optics are drawn closer together to achieve an accommodative effect in the eye. When the ciliary muscles relax, the haptics flex in the opposite direction (toward a straightened position) causing the optics to space further apart and the lens device returns the eye to its natural, unaccommodative state.

[0004] As stated above, single optic intraocular lenses have been known and used for decades while the two lens accommodative intraocular lens device is new and not yet seen on the market. It will be appreciated that manufacturing, packaging and otherwise handling a two optic lens device presents issues not present in the manufacture, packaging and handling of single optic intraocular lenses. In the '762 application listed above, a two optic IOL is injection molded in a mold cavity having a removable metal insert centrally located between first and second cavity blocks. The IOL first optic is formed between the first cavity block and a first surface of the mold insert and the second optic is formed between the second cavity block and the opposite surface of the mold insert. The haptics interconnect and are integrally formed with the first and second optics. The inner surfaces of the haptics are formed by the perimeter of the mold insert and the outer surfaces thereof are formed by the first and second cavity blocks. Silicone is injected into the cavity and allowed to cure to form the IOL. The cavity blocks are opened and the mold insert is removed therefrom. The mold insert is preferably connected to a handle to permit easy handling thereof. The IOL remains connected to the mold insert as the mold insert is removed from between the cavity blocks. Since the IOL is made of silicone, it may be removed from the mold insert by carefully stretching it to allow the mold insert to pass between an opening defined between the haptic or haptics. The mold insert is then replaced between the cavity blocks to injection mold another IOL. The injection mold tools are made of suitable materials able to withstand repeated molding cycles.

[0005] While the above manufacturing method is satisfactory for injection molding a two optic IOL, improvements may be made. For example, a need exists for a robust liquid injection molding method which produces high quality IOLs. It would also be desirable to have a liquid injection molding apparatus and method that reduces or eliminates knit lines, gate vestiges and the like on the molded IOL such that post-molding processes to remove such molding remnants are likewise reduced or eliminated.

[0006] Document WO 2004/010905 A2 discloses an intraocular lens that alter the refractive power of the eye in response to changes in the tension of the ciliary muscle of the eye and a manufactoring method and an apparatus which discloses the preamble of claim 1.

Summary of the Invention

[0007] The objects of the invention are achieved by the features of the claims. The present invention describes predetermined surface finishes on preselected mold cavity parts of a liquid injection molding apparatus though these are not part of the invention. Surface finishes can be used for various purposes such as, for example, creating a "frosted" appearance to one or more haptics of an IOL which may improve visualization for the surgeon during the implantation procedure. Surface finishes may also be used to facilitate removal of the lens device from the mold insert, for example.

[0008] The invention provides a liquid injection molding apparatus for making IOLs which are of high quality and require a minimum of post molding operations such as edging to remove gate vestiges.

[0009] The invention comprises an improved apparatus for liquid injection molding a dual optic intraocular lens device such as lens device 10. In a preferred embodiment, injection of the liquid lens material into the mold cavity is provided through first and second gates leading into the first and second optic cavities, respectively, thereby improving the mold flow dynamics resulting in a higher quality lens device. In a preferred embodiment, the first and second gates taper to reduce or eliminate gate vestiges on the resultant lens device.

[0010] The present invention will be described with regard to preferred embodiments thereof, it being understood that modifications may be made without departing from the full scope of the invention as claimed. It is also noted that certain aspects of the invention may be solely applicable to a dual optic lens device while other aspects of the invention may be more broadly applicable to lens devices having one or more optics and with or without one or more haptics integrally molded therewith.

Brief Description of the Drawings

[0011] 

Figure 1 is an enlarged, perspective view of an embodiment of a dual optic intraocular lens;

Figure 2 is a perspective view of a first half of a cavity block according to an embodiment of the invention;

Figure 3 is a perspective view of a second half of a cavity block according to an embodiment of the invention;

Figure 4A is a side elevational view of an embodiment of the mold insert of the invention;

Figure 4B is the view of Fig. 4A showing the optical insert in spaced relation to the other parts of the mold insert;

Figure 4C is a perspective view of Fig. 4B;

Figure 4D is a plan view of Fig. 4A;

Figure 4E is a perspective view of the mold insert with a molded IOL attached thereto;

Figure 5A is a perspective view of the cavity blocks and inserts in their assembled, closed condition;

Figure 5B is a top plan view of Fig. 5A with the handle of the mold insert shown fragmented;

Figure 5C is a cross-sectional view as taken generally along the line 5C-5C in Figs. 5A and B;

Figure 5D is an enlarged, fragmented view of the mold cavity seen in Fig. 5C;

Figure 6A is an exploded, perspective view of the mold base, cavity blocks and mold inserts;

Figure 6B is a plan view of one half of the mold base with the associated cavity block and mold insert;

Figure 6C is a plan view of the other half of the mold base with the associated cavity block and mold insert; and

Figure 6D is a perspective view of the assembled mold base.

Detailed Description

[0012] The present invention will be described with regard to preferred embodiments thereof, it being understood that modifications may be made without departing from the full scope of the invention as claimed. It is also noted that certain aspects of the invention may be solely applicable to a dual optic lens device while other aspects of the invention may be more broadly applicable to lens devices having one or more optics with or without one or more haptics separately attached or integrally molded therewith.

[0013] Referring now to the drawing, there is seen in Fig. 1 an embodiment of a dual optic accommodative intraocular lens device 10 which may be made with the present invention. Briefly, lens device 10 includes first and second optics 12, 14 interconnected by one or more, but preferably three, haptics 16a, 16b and 16c defining three open spaces 18a, 18b, 18c therebetween, respectively. Haptics 16a-c bow outwardly past the optic perimeters 12p, 14p and are flexible whereby the optics may move alternately toward and away from each other generally along the optical axis OA-OA. Optics 12, 14 and haptics 16a-c are formed as a unitary element and may be made of any suitable IOL liquid lens material such as silicone, for example. First optic 12 may be a double convex positive lens and second optic 14 may be a plano-concave negative lens positioned posterior relative to first optic 12 in an eye as described more fully in the Sarfarazi patents listed above.

[0014] Referring to Figures 2-6B, first and second cavity blocks 30, 32 are provided each having a cavity portion 30a, 32a which, when assembled in facing relation, form a completed cavity shaped to mold a lens device of the desired configuration therein. For purposes of description, cavity blocks 30, 32 will be described in the configuration for molding the dual optic lens device 10 shown in Fig. 1. Each cavity block includes a base 30b, 32b having one or more alignment features such as taper locks 30c, 32c and cut-outs 30d, 32d, respectively, which mate to properly align the cavity tool portions 30a, 30b when the cavity blocks are brought together. The cavity blocks 30, 32 are mounted with appropriate mounting pins into respective halves 80a, 80b of a mold base 80 (Figs. 6A and 6B), particulars of which are explained more fully below. Mold base 80 is mounted in an injection mold machine (not shown) operable to alternately open and close the cavity blocks 30, 32 between molding cycles. The molding machine setup of course provides all necessary mold processing apparatus such as, for example, electronic controls, heating elements for curing the lens device in the cavity, cooling elements, and an injection nozzle assembly for injecting the liquid lens material into the mold cavity.

[0015] Cavity tool portions 30a, 32a each include an optical surface 30f, 32f which form the outwardly facing surfaces 12a, 14a of lens optics 12, 14, respectively. The inwardly facing surfaces 12b, 14b of lens optics 12, 14 are formed by first and second optical surfaces 40a, 40b provided on mold insert 40 (Figs. 4A-D), respectively. In the preferred embodiment, all mold optical surfaces are provided on individual inserts which are removably attached to their respective mountings. More particularly, as seen in Figs. 5C and 5D, optical surfaces 30f, 32f are provided on respective tool inserts 50, 52 which are removably mounted through openings 30g, 32g in respective cavity blocks 30, 32, respectively. Backing plates 60, 62 abut cavity blocks 30, 32 and are secured thereto via bolts 60a, 62a having shanks 60b, 62b which thread into the non-optical ends 50a, 52a of optical inserts 50, 52, respectively. Optical surfaces 30f, 32f are preferably formed by EDM or diamond turned metal of high optical quality and thermal conductivity (e.g., CuNi).

[0016] The outwardly facing surfaces 16a'-c' of haptics 16a-c of lens device 10 are formed by cavity surfaces 30h,i,j in cavity portion 30a (Fig. 3), and by cavity surfaces 32h,i,j in cavity portion 32a (Fig. 2), respectively. Cavity surfaces 30h,i,j and 32h,i,j are recessed relative to intervening cavity surfaces 30k,1,m and 32k,1,m for reasons explained below. When optical inserts 50, 52 are mounted in cavity blocks 30, 32, the optical surfaces 30f, 32f thereof are located radially inward and adjacent cavity surfaces 30h,i,j and 32h,i,j, respectively. When cavity blocks 30, 32 are brought together, the parting line PL is preferably located about the midline of lens device 10 defined by a plane intersecting the haptics 16a-c at their largest outer diameter.

[0017] The inwardly facing surfaces 16a"-c" of haptics 16a-c are formed by cavity surfaces 40c,d,e on annular portion 40" of mold insert 40 (Fig. 4D). The annular portion 40" is preferably of uniform thickness about its circumference and is sized such that haptic forming cavities HC_1-3 are created between mold insert surfaces 40c,d,e and cavity surfaces 30h,i,j and 32h,i,j (which are recessed relative to intervening cavity surfaces 30k,1,m and 32k,1,m) when the mold is closed as seen in Figs. 5A-D. (Only one haptic cavity HC₁ is seen in Figs. 5C and 5D.) Liquid lens material is prevented from flowing between the haptic forming cavities HC_1-3 due to the close, abutting relationship of mold insert surfaces 40f,g,h and cavity surfaces 30k,1,m and 32k,1,m. Since lens material cannot flow here, open spaces 18a,b,c are thereby created between haptics 16a,b,c in the molded lens device 10 (see Fig. 1).

[0018] In a preferred embodiment, mold insert 40 is attached to a handle 42 to assist in alternately inserting and removing mold insert 40 from between cavity blocks 30, 32. In this embodiment, the handle part resides between grooves 35, 37 provided in cavity blocks 30, 32, respectively, and cuts off mold flow to the area between haptic forming surfaces 30h,j and 32h,j. A hole 43 in handle 42 may be engaged with a pin 81 provided in the mold base 80 (see Fig. 6A) to align mold insert 40 between optical surfaces 30f, 32f. In this embodiment, pin 81 is provided on core clamping plate 87 and extends through a hole 86a provided in core plate 86. The hole 86a is located in a linear recess 86b which is coextensive with recess 35 in cavity block 30 to accommodate mold insert handle 42 therein. Other alignment means may of course be used as desired.

[0019] As seen in Figs. 4B,C, optical surfaces 40a,b are provided on an insert 40' that is mounted in the central opening 45 of annular mold insert surface 40". Insert 40' may be secured thereto by injecting a quantity of liquid adhesive through a hole 43 extending to a groove 41 provided on the inside diameter of mold insert annular portion 40" (Fig. 4C). By providing insert 40' and annular portion 40" as separate components, they may be made of different materials and have different surface finishes. For example, insert 40' which forms the device optics may be made of diamond turned metal while annular portion 40" which forms the device haptics may be made of a high quality, thermally resistant plastic material such as ALTEM that is capable of repeated molding cycles, or vice-versa. Other methods for securing insert 40' within opening 45 may of course be used (e.g., friction fit, mechanical interlock, etc.).

[0020] To begin a molding cycle, mold insert 40 is placed between cavity blocks 30,32 as described above. In a preferred embodiment, the mold insert 40 is laid upon one of the cavity blocks 30 or 32 first with handle 42 residing in the respective groove 35 or 37. The second cavity block is then moved against the first cavity block, sandwiching mold insert 40 therebetween and creating the mold cavity. When molding lens devices having concave and convex optical surfaces such as lens device 10, it is preferred that the concave optical surface 40a of mold insert 40 which is responsible for making the convex optical surface 12b of the lens device, is first placed face-down in cavity block 30. This is to reduce the chance of scratching the convex optical surface 40b of the mold insert which is face-up and not being brought to bear against a cavity block at this point. This is particularly true in the case where the mold insert 40 is being manually placed on the cavity block by a worker who may inadvertently touch a protruding convex surface 40b of the mold insert with parts of the cavity block when trying to place this side down in the cavity block. Should such scratching occur, this would transfer to the molded lens device which would have to be scrapped. By instead placing the concave surface 40a face down, there is less chance that the worker could inadvertently touch the concave surface 40a (since it is recessed) with parts of the cavity block against which it is being laid. In the embodiment of lens device 10, the cavity block 30 responsible for forming the positive optic 12 (double convex) is thus positioned below the cavity block 32 for forming the negative optic 14 (plano-concave) wherein mold insert 40 is first placed on cavity block 30 with mold insert concave surface 40a facing cavity surface 30a (see Fig. 6A). Cavity block 32 is then moved against cavity block 30 to create the mold cavity ready to receive liquid lens material (Figs. 5A-D).

[0021] Referring again to Figs. 2, 3 and 5C,D and 6A-D, a preferably full-round primary runner 70 is formed by facing half-round runner surfaces 70a, 70b provided in cavity blocks 30, 32, respectively. Runner geometries other than round are of course possible. A cavity block runner 72, which may extend co-planar for a horizontal injection (as shown) or perpendicular for a vertical injection (not shown) to primary runner 70, is formed by runner surfaces 72a and 72b in cavity blocks 30, 32, respectively, when the mold is closed. The core plates 86, 88, in which cavity blocks 30, 32 are respectively mounted (Figs. 6B, C), include runner halves 84a, 84b which, when the mold is closed, form lead-in runner 84 which extends into cavity block runner 72 which, in turn, extends into primary runner 70. A runner insert 72c provides a bridge between runner surface 72b and 84b in cavity block 32 (Figs. 6B,D).

[0022] Primary runner 70 then extends toward the mold cavity and branches into first and second sub-runners 70a', 70b' which extend into the optical cavities OC₁ and OC₂ through first and second gates 70a", 70b" respectively. The first and second gates 70a" and 70b" are preferably located at the perimeter of the optical cavities OC₁ and OC₂ between adjacent haptic-forming cavities. In this regard, it is noted that the sub-runners 70a', 70b' are formed in part by the annular portion 40" of mold insert 40 (refer to the inner arcs of the sub-runners in cross-sectional view of Figs. 5C, D). The general locations of first and second gates 70a" and 70b" are indicated with respect to the finished lens in Fig. 1. The first and second gates 70a", 70b" are preferably configured to taper inwardly into their respective mold cavities OC₁, OC₂ such that little or no gate vestige is created at these areas of the molded lens device. In a preferred embodiment, the gates 70a", 70b" taper at an angle of between about 5 and 25 degrees, more preferably between about 10 and 20 degrees, and most preferably taper at an angle of about 15 degrees. The taper length is preferably about 1 to 1.0mm and more preferably is about .53mm.

[0023] Referring particularly to Figs. 5 and 6, liquid lens material (e.g. silicone) is injected through inject port 82, through lead-in runner 84, through cavity block runner 72, through primary runner 70, then branching through both the first and second sub-runners 70a', 70b'. The diameters of sub-runners 70a', 70b' are preferably substantially equal such that substantially equal amounts of liquid lens material travels therethrough although this may change depending on the lens design. This creates two flow fronts which meet at about the midline of the haptic cavities HC_1-3. This is preferable over a flow front that meets at one or both of the optical cavities OC₁ and OC₂ since unacceptable optics could result. To enhance material flow, the diameters of the runners may step down toward the cavity. In liquid injection molding, the material is injected at a cool temperature relative to the heated mold cavity. In the present embodiment, liquid silicone is injected at a temperature of about -1°C (30°F) to 10°C (50°F) and more preferably at about 4-4°C (40°F).

[0024] Once the liquid lens material has been injected, heat is applied to the mold base 80 to cure the liquid lens material (e.g., in the range of about 121°C (250°F) to 149°C (300°F) and more preferably about 130°C (280°F)). In a preferred embodiment, a vacuum may be drawn from the mold cavity through vacuum line VL to assist in the injection of the liquid lens material. Application of a vacuum during injection may be desirable to eliminate air bubbles and ensure a complete fill of the mold cavities. The vacuum may also help reduce flash. A hole 47 is provided in mold insert handle 42 where the vacuum line begins. A gasket 83 may be applied in surrounding relation to the cavity blocks 30,32 to help create an air-tight seal for a more effective vacuum draw. The gasket may have a runner groove 83a which aligns with the lead-in runner half 84a, as well as a groove 83b which aligns with groove 86b to accommodate the mold insert handle 42.

[0025] Once the lens material has cured, the cavity blocks are cooled to permit opening of mold base halves 80a, 80b along parting line PL. Mold insert 40 is removed from between cavity blocks 30, 32 using handle 42. Lens device 10 remains adhered about mold insert 40 at this point (Fig. 4E). Due to the tapered gate configuration, the liquid lens material in the runners should remain with one of the cavity blocks and have a clean break from the lens device 10. Should they remain attached to the lens device 10, they may be carefully removed therefrom. To remove the lens device 10 from mold insert 40, two of the haptics 16a-c (preferably the two on either side of handle 42) are carefully stretched apart to permit the passage of mold insert 40 therebetween. Due to the resilient nature of the liquid lens material, the lens device 10 quickly returns to its unstretched state.

[0026] As stated above, different surface finishes may be applied to one or more preselected cavity surfaces to provide different surface characteristics to different portions of the molded lens device 10 as desired. A different surface finish may be desirable on the outwardly facing surfaces of haptics 16a-c to improve visualization thereof during implantation. For example, a "frosted" haptic appearance may be created by making the haptic forming mold cavity surfaces with an Ra of between about .15µ to 1.25µ, and more preferably between about .3µ and .75µ and most preferably about .55µ.

[0027] Surface finishes may also be used to ease the removal of the lens device from the mold insert 40. Since mold device 10 may be formed of a flexible material such as silicone, it may be removed from insert 40 by carefully stretching the haptics such that the mold insert may pass through the space defined between adjacent haptics as described above. A surface finish which is too smooth is undesirable since silicone will have a tendency to stick to a very smooth surface creating difficulty in release from the cavity and the paddle. On the other hand, a surface finish that is too rough will impart unacceptable imperfections to the lens. The surface finish should therefore be somewhere between very smooth and very rough. An Ra surface finish of between about less than or equal to 15nm has been found to produce acceptable lens release and lens surface quality. Surface finishes may be determined using any type of known method and machine, e.g., a Zygo Newview microscope at 10X.

Claims

1. Apparatus for injection molding an intraocular lens having first and second optics (12,14), said apparatus comprising:

a) first optic cavity for forming said first optic (12);

b) a second optic cavity for forming said second optic (14); characterised in that it further comprises,

c) a first sub-runner (70a') in fluid communication with said first optic cavity; and

d) a second sub-runner (70b') in fluid communication with said second optic cavity.

2. The apparatus of claim 1, and further comprising a primary runner (72) from which said first and second sub-runners (70a', 70b') branch off and extend to said first and second optic cavities, respectively.

3. The apparatus of claim 1 wherein said first and second sub-runners (70a', 70b') have a substantially circular cross-section.

4. The apparatus of claim 3 wherein said primary runner (72) has a substantially circular cross-section.

5. The apparatus of claim 1 and further comprising one or more haptic cavities (HC₁-HC₃) extending between and in fluid communication with said first and second optic cavities, said one or more haptic cavities (HC₁-HC₃) for forming one or more haptics (16a-16c) extending between and interconnecting said first and second optics (12, 14), respectively.

6. The apparatus of claim 1 and further comprising a mold insert (40) having first and second optical surfaces defining in part said first and second optic cavities, respectively.

7. The apparatus of claim 6 and further comprising a handle (42) to which said mold insert (40) is attached whereby said handle (42) may be used for alternately locating and removing said mold insert (40) from said apparatus between molding cycles.

8. The apparatus of claim 6 and further comprising first and second cavity blocks (30, 32) each having an optical surface, said optical surface of said first and second cavity blocks (30, 32) and said first and second optical surfaces of said mold insert (40) together defining said first and second optical cavities, respectively.

9. The apparatus of claim 1 wherein said first and second sub-runners (70a', 70b') extend substantially horizontally.

10. The apparatus of claim 9 wherein said primary runner (72) extends substantially horizontally.

11. The apparatus of claim 1, adapted to inject liquid lens material through said first and second sub-runners (70a', 70b') substantially simultaneously.

12. The apparatus of claim 1 wherein first and second injection gates (70a', 70b') are defined at the juncture of said first optic cavity and said first sub-runner (70a'), and at the juncture of said second optic cavity and said second sub-runner (70b'), respectively, said first and second injection gates (70a", 70b") each tapering inwardly into said first and second optic cavities, respectively.

13. The apparatus of claim 12 wherein said taper is between about 5 and 25 degrees.

14. The apparatus of claim 12 wherein said taper is between about 10 and 20 degrees.

15. The apparatus of claim 12 wherein said taper is about 15 degrees.

16. The apparatus of claim 1 wherein said first optic cavity is shaped to form a positive lens, and said second optic cavity is shaped to form a negative lens.

17. The apparatus of claim 16 wherein said first optic cavity is positioned below said second optic cavity.

18. The apparatus of claim 17 and further comprising a mold insert (40) having first and second optic surfaces defining in part said first and second mold cavities, respectively.

19. The apparatus of claim 18 and further comprising a handle (42) to which said mold insert (40) is attached whereby said handle (42) may be used for alternately locating and removing said mold insert from said apparatus between molding cycles.

20. The apparatus of claim 1 wherein said first and second optic cavities are formed in part by first and second optical surfaces defined on first and second tool inserts (50, 52), respectively.

21. The apparatus of claim 20 and further comprising first and second cavity blocks wherein said first and second tool inserts (50, 52) are removably mounted, respectively

22. The apparatus of claim 21 and further comprising a mold insert (40) having first and second optical surfaces which, together with said first and second optical surfaces of said first and second tool inserts (50, 52), define said first and second optic cavities, respectively.

23. The apparatus of claim 22 wherein said mold insert (40) is removably mounted between said first and second cavity blocks (30, 32).

24. The apparatus of claim 21 and further comprising at least one haptic forming cavity formed between said first and second cavity blocks (30, 32) radially outwardly of said first and second optical surfaces.

25. The apparatus of claim 24 and further comprising a mold insert (40) having first and second optical surfaces which, together with said first and second optical surfaces of said first and second tool inserts (50, 52), define said first and second optic cavities, respectively.

26. The apparatus of claim 25 wherein said haptic forming cavity is defined at least in part by said mold insert (40).

27. The apparatus of claim 25 wherein said mold insert (40) includes an annular surface which defines at least part of said haptic forming cavity.

28. The apparatus of claim 27 wherein said first and second optical surfaces of said mold insert (40) are formed on a tool insert circumscribed by said annular surface.

29. The apparatus of claim 28 wherein said tool insert of said mold insert (40) is adhesively secured to said annular surface.

30. The apparatus of claim 29 wherein said annular surface includes a through hole wherethrough adhesive may be injected to secure said mold insert tool insert to said annular surface,

31. The apparatus of claim 30 and further comprising a handle (42) attached to said mold insert (40).

32. The apparatus of claim 31 and further comprising first and second grooves formed in said first and second cavity blocks (30, 32) wherein said handle (42) resides when said first and second cavity blocks (30, 32) are placed in abutting relation.

33. A method for injection molding an intraocular lens having first and second optics, said method comprising the steps of:

a) providing a first optic cavity for forming said first optic;

b) providing a second optic cavity for forming said second optic;

c) providing a first sub-runner in fluid communication with said first optic cavity; and

d) providing a second sub-runner in fluid communication with said second optic cavity.

34. The method of claim 33, and further comprising the step of providing a primary runner from which said first and second sub-runners branch off and extend to said first and second optic cavities.

35. The method of claim 33 wherein said first and second sub-runners have a substantially circular cross-section.

36. The method of claim 35 wherein said primary runner has a substantially circular cross-section.

37. The method of claim 36 and further comprising the step of providing one or more haptic cavities extending between and in fluid communication with said first and second optic cavities, said one or more haptic cavities for forming one or more haptics extending between and interconnecting said first and second optics, respectively.

38. The method of claim 33 and further comprising the step of providing a mold insert having first and second optical surfaces defining in part said first and second optic cavities, respectively.

39. The method of claim 38 and further comprising the step of providing a handle to which said mold insert is attached whereby said handle may be used for alternately locating and removing said mold insert from said apparatus between molding cycles.

40. The method of claim 38 and further comprising the step of providing first and second cavity blocks each having an optical surface, said optical surface of said first and second cavity blocks and said first and second optical surfaces of said mold insert together defining said first and second optical cavities, respectively.

41. The method of claim 33 wherein said first and second sub-runners extend substantially horizontally.

42. The method of claim 41 wherein said primary runner extends substantially horizontally.

43. The method of claim 33 wherein liquid lens material is injected through said first and second sub-runners substantially simultaneously.

44. The method of claim 33 wherein first and second injection gates are defined at the juncture of said first optic cavity and said first sub-runner, and at the juncture of said second optic cavity and said second sub-runner, respectively, said first and second injection gates each taper inwardly into said first and second optic cavities, respectively.

45. The method of claim 44 wherein said taper is between about 5 and 25 degrees.

46. The method of claim 44 wherein said taper is between about 10 and 20 degrees.

47. The method of claim 44 wherein said taper is about 15 degrees.

48. The method of claim 33 wherein said first optic cavity is shaped to form a positive lens, and said second optic cavity is shaped to form a negative lens.

49. The method of claim 48 wherein said first optic cavity is positioned below said second optic cavity.

50. The method of claim 49 and further comprising the step of providing a mold insert having first and second optic surfaces defining in part said first and second mold cavities, respectively.

51. The method of claim 50 and further comprising the step of providing a handle to which said mold insert is attached whereby said handle may be used for alternately locating and removing said mold insert from said apparatus between molding cycles.

52. The method of claim 33 wherein said first and second optic cavities are formed in part by first and second optical surfaces defined on first and second tool inserts, respectively.

53. The method of claim 52 and further comprising the step of providing first and second cavity blocks wherein said first and second tool inserts are removably mounted, respectively.

54. The method of claim 53 and further comprising the step of providing a mold insert having first and second optical surfaces which, together with said first and second optical surfaces of said first and second tool inserts, define said first and second optic cavities, respectively.

55. The method of claim 54 wherein said mold insert is removably mounted between said first and second cavity blocks.

56. The method of claim 53 and further comprising the step of providing at least one haptic forming cavity formed between said first and second cavity blocks radially outwardly of said first and second optical surfaces.

57. The method of claim 56 and further comprising the step of providing a mold insert having first and second optical surfaces which, together with said first and second optical surfaces of said first and second tool inserts, define said first and second optic cavities, respectively.

58. The method of claim 57 wherein said haptic forming cavity is defined at least in part by said mold insert.

59. The method of claim 57 wherein said mold insert includes an annular surface which defines at least part of said haptic forming cavity.

60. The method of claim 59 wherein said first and second optical surfaces of said mold insert are formed on a tool insert circumscribed by said annular surface.

61. The method of claim 60 wherein said tool insert of said mold insert is adhesively secured to said annular surface.

62. The method of claim 61 wherein said annular surface includes a through hole wherethrough adhesive may be injected to secure said mold insert tool insert to said annular surface.

63. The method of claim 62 and further comprising the step of providing a handle attached to said mold insert.

64. The method of claim 63 and further comprising the step of providing first and second grooves formed in said first and second cavity blocks wherein said handle resides when said first and second cavity blocks are placed in abutting relation.

Ansprüche

1. Vorrichtung zum Spritzgießen einer Intraokularlinse mit einer ersten und einer zweiten Optik (12, 14), wobei die Vorrichtung aufweist:

a) einen ersten Optikhohlraum zum Bilden der ersten Optik (12);

b) einen zweiten Optikhohlraum zum Bilden der zweiten Optik (14) ;
dadurch gekennzeichnet, daß sie ferner aufweist:

c) einen ersten Nebenkanal (70a') in Fluidkommunikation mit dem ersten Optikhohlraum; und

d) einen zweiten Nebenkanal (70b') in Fluidkommunikation mit dem zweiten Optikhohlraum.

2. Vorrichtung nach Anspruch 1 und ferner mit einem Hauptkanal (72), von dem der erste und zweite Nebenkanal (70a', 70b') abzweigen und sich zum ersten bzw. zweiten Optikhohlraum erstrecken.

3. Vorrichtung nach Anspruch 1, wobei der erste und zweite Nebenkanal (70a', 70b') einen im wesentlichen kreisförmigen Querschnitt haben.

4. Vorrichtung nach Anspruch 3, wobei der Hauptkanal (72) einen im wesentlichen kreisförmigen Querschnitt hat.

5. Vorrichtung nach Anspruch 1 und ferner mit einem oder mehreren Haptikhohlräumen (HC₁-HC₃), die sich zwischen dem ersten und zweiten Optikhohlraum erstrecken und in Fluidkommunikation damit stehen, wobei der eine oder die mehreren Haptikhohlräume (HC₁-HC₃) zum Bilden einer oder mehrerer Haptiken (16a-16c) dienen, die sich zwischen der ersten und zweiten Optik (12, 14) erstrecken und diese jeweils miteinander verbinden.

6. Vorrichtung nach Anspruch 1 und ferner mit einem Formeinsatz (40) mit einer ersten und einer zweiten optischen Oberfläche, die den ersten bzw. zweiten Optikhohlraum teilweise festlegen.

7. Vorrichtung nach Anspruch 6 und ferner mit einem Griff (42), an dem der Formeinsatz (40) angebracht ist, wodurch der Griff (42) zum abwechselnden Anordnen und Entfernen des Formeinsatzes (40) aus der Vorrichtung zwischen Formzyklen verwendet werden kann.

8. Vorrichtung nach Anspruch 6 und ferner mit einem ersten und einem zweiten Hohlraumblock (30, 32) mit jeweils einer optischen Oberfläche, wobei die optische Oberfläche des ersten und zweiten Hohlraumblocks (30, 32) sowie die erste und zweite optische Oberfläche des Formeinsatzes (40) gemeinsam den ersten bzw. zweiten Optikhohlraum festlegen.

9. Vorrichtung nach Anspruch 1, wobei sich der erste und zweite Nebenkanal (70a', 70b') im wesentlichen waagerecht erstrecken.

10. Vorrichtung nach Anspruch 9, wobei sich der Hauptkanal (72) im wesentlichen waagerecht erstreckt.

11. Vorrichtung nach Anspruch 1, die so ausgeführt ist, daß sie flüssiges Linsenmaterial durch den ersten und zweiten Nebenkanal (70a', 70b') im wesentlichen gleichzeitig einspritzt.

12. Vorrichtung nach Anspruch 1, wobei ein erster und ein zweiter Einspritzanschnitt (70a", 70b") an der Verbindungsstelle des ersten Optikhohlraums und des ersten Nebenkanals (70a') bzw. an der Verbindungsstelle des zweiten Optikhohlraums und des zweiten Nebenkanals (70b') festgelegt sind, wobei sich der erste und zweite Einspritzanschnitt (70a", 70b") in den ersten bzw. zweiten Optikhohlraum jeweils nach innen verjüngen.

13. Vorrichtung nach Anspruch 12, wobei die Verjüngung zwischen etwa 5 und 25 Grad liegt.

14. Vorrichtung nach Anspruch 12, wobei die Verjüngung zwischen etwa 10 und 20 Grad liegt.

15. Vorrichtung nach Anspruch 12, wobei die Verjüngung etwa 15 Grad beträgt.

16. Vorrichtung nach Anspruch 1, wobei der erste Optikhohlraum so geformt ist, daß er eine Positivlinse bildet, und der zweite Optikhohlraum so geformt ist, daß er eine Negativlinse bildet.

17. Vorrichtung nach Anspruch 16, wobei der erste Optikhohlraum unter dem zweiten Optikhohlraum positioniert ist.

18. Vorrichtung nach Anspruch 17 und ferner mit einem Formeinsatz (40) mit einer ersten und einer zweiten optischen Oberfläche, die den ersten bzw. zweiten Formhohlraum teilweise festlegen.

19. Vorrichtung nach Anspruch 18 und ferner mit einem Griff (42), an dem der Formeinsatz (40) angebracht ist, wodurch der Griff (42) zum abwechselnden Anordnen und Entfernen des Formeinsatzes aus der Vorrichtung zwischen Formzyklen verwendet werden kann.

20. Vorrichtung nach Anspruch 1, wobei der erste und zweite Optikhohlraum teilweise durch eine erste und eine zweite optische Oberfläche gebildet sind, die auf einem ersten bzw. einem zweiten Werkzeugeinsatz (50, 52) festgelegt sind.

21. Vorrichtung nach Anspruch 20 und ferner mit einem ersten und einem zweiten Hohlraumblock, in denen der erste bzw. zweite Werkzeugeinsatz (50, 52) entfernbar angeordnet sind.

22. Vorrichtung nach Anspruch 21 und ferner mit einem Formeinsatz (40) mit einer ersten und einer zweiten optischen Oberfläche, die zusammen mit der ersten und zweiten optischen Oberfläche des ersten und zweiten Werkzeugeinsatzes (50, 52) den ersten bzw. zweiten Optikhohlraum festlegen.

23. Vorrichtung nach Anspruch 22, wobei der Formeinsatz (40) zwischen dem ersten und zweiten Hohlraumblock (30, 32) entfernbar angeordnet ist.

24. Vorrichtung nach Anspruch 21 und ferner mit mindestens einem Haptikbildungshohlraum, der zwischen dem ersten und zweiten Hohlraumblock (30, 32) von der ersten und zweiten optischen Oberfläche radial nach außen gebildet ist.

25. Vorrichtung nach Anspruch 24 und ferner mit einem Formeinsatz (40) mit einer ersten und einer zweiten optischen Oberfläche, die zusammen mit der ersten und zweiten optischen Oberfläche des ersten und zweiten Werkzeugeinsatzes (50, 52) den ersten bzw. zweiten Optikhohlraum festlegen.

26. Vorrichtung nach Anspruch 25, wobei der Haptikbildungshohlraum mindestens teilweise durch den Formeinsatz (40) festgelegt ist.

27. Vorrichtung nach Anspruch 25, wobei der Formeinsatz (40) eine Ringfläche aufweist, die mindestens einen Teil des Haptikbildungshohlraums festlegt.

28. Vorrichtung nach Anspruch 27, wobei die erste und zweite optische Oberfläche des Formeinsatzes (40) auf einem Werkzeugeinsatz gebildet sind, der von der Ringfläche umschrieben ist.

29. Vorrichtung nach Anspruch 28, wobei der Werkzeugeinsatz des Formeinsatzes (40) an der Ringfläche klebend befestigt ist.

30. Vorrichtung nach Anspruch 29, wobei die Ringfläche ein Durchgangsloch aufweist, durch das Kleber eingespritzt werden kann, um den Formeinsatz-Werkzeugeinsatz an der Ringfläche zu befestigen.

31. Vorrichtung nach Anspruch 30 und ferner mit einem am Formeinsatz (40) angebrachten Griff (42).

32. Vorrichtung nach Anspruch 31 und ferner mit einer ersten und einer zweiten Nut, die im ersten und zweiten Hohlraumblock (30, 32) gebildet sind, in denen sich der Griff (42) befindet, wenn der erste und zweite Hohlraumblock (30, 32) in Anlagebeziehung plaziert sind.

33. Verfahren zum Spritzgießen einer Intraokularlinse mit einer ersten und einer zweiten Optik, wobei das Verfahren die Schritte aufweist:

a) Bereitstellen eines ersten Optikhohlraums zum Bilden der ersten Optik;

b) Bereitstellen eines zweiten Optikhohlraums zum Bilden der zweiten Optik;

c) Bereitstellen eines ersten Nebenkanals in Fluidkommunikation mit dem ersten Optikhohlraum; und

d) Bereitstellen eines zweiten Nebenkanals in Fluidkommunikation mit dem zweiten Optikhohlraum.

34. Verfahren nach Anspruch 33 und ferner mit dem Schritt: Bereitstellen eines Hauptkanals, von dem der erste und zweite Nebenkanal abzweigen und sich zum ersten und zweiten Optikhohlraum erstrecken.

35. Verfahren nach Anspruch 33, wobei der erste und zweite Nebenkanal einen im wesentlichen kreisförmigen Querschnitt haben.

36. Verfahren nach Anspruch 35, wobei der Hauptkanal einen im wesentlichen kreisförmigen Querschnitt hat.

37. Verfahren nach Anspruch 36 und ferner mit dem Schritt: Bereitstellen eines oder mehrerer Haptikhohlräume, die sich zwischen dem ersten und zweiten Optikhohlraum erstrecken und in Fluidkommunikation damit stehen, wobei der eine oder die mehreren Haptikhohlräume zum Bilden einer oder mehrerer Haptiken dienen, die sich zwischen der ersten und zweiten Optik erstrecken und diese jeweils miteinander verbinden.

38. Verfahren nach Anspruch 33 und ferner mit dem Schritt: Bereitstellen eines Formeinsatzes mit einer ersten und einer zweiten optischen Oberfläche, die den ersten bzw. zweiten Optikhohlraum teilweise festlegen.

39. Verfahren nach Anspruch 38 und ferner mit dem Schritt: Bereitstellen eines Griffs, an dem der Formeinsatz angebracht ist, wodurch der Griff zum abwechselnden Anordnen und Entfernen des Formeinsatzes aus der Vorrichtung zwischen Formzyklen verwendet werden kann.

40. Verfahren nach Anspruch 38 und ferner mit dem Schritt: Bereitstellen eines ersten und eines zweiten Hohlraumblocks mit jeweils einer optischen Oberfläche, wobei die optische Oberfläche des ersten und zweiten Hohlraumblocks sowie die erste und zweite optische Oberfläche des Formeinsatzes gemeinsam den ersten bzw. zweiten Optikhohlraum festlegen.

41. Verfahren nach Anspruch 33, wobei sich der erste und zweite Nebenkanal im wesentlichen waagerecht erstrecken.

42. Verfahren nach Anspruch 41, wobei sich der Hauptkanal im wesentlichen waagerecht erstreckt.

43. Verfahren nach Anspruch 33, wobei flüssiges Linsenmaterial durch den ersten und zweiten Nebenkanal im wesentlichen gleichzeitig eingespritzt wird.

44. Verfahren nach Anspruch 33, wobei ein erster und ein zweiter Einspritzanschnitt an der Verbindungsstelle des ersten Optikhohlraums und des ersten Nebenkanals bzw. an der Verbindungsstelle des zweiten Optikhohlraums und des zweiten Nebenkanals festgelegt sind, wobei sich der erste und zweite Einspritzanschnitt in den ersten bzw. zweiten Optikhohlraum jeweils nach innen verjüngen.

45. Verfahren nach Anspruch 44, wobei die Verjüngung zwischen etwa 5 und 25 Grad liegt.

46. Verfahren nach Anspruch 44; wobei die Verjüngung zwischen etwa 10 und 20 Grad liegt.

47. Verfahren nach Anspruch 44, wobei die Verjüngung etwa 15 Grad beträgt.

48. Verfahren nach Anspruch 33, wobei der erste Optikhohlraum so geformt ist, daß er eine Positivlinse bildet, und der zweite Optikhohlraum so geformt ist, daß er eine Negativlinse bildet.

49. Verfahren nach Anspruch 48, wobei der erste Optikhohlraum unter dem zweiten Optikhohlraum positioniert ist.

50. Verfahren nach Anspruch 49 und ferner mit dem Schritt: Bereitstellen eines Formeinsatzes mit einer ersten und einer zweiten optischen Oberfläche, die den ersten bzw. zweiten Formhohlraum teilweise festlegen.

51. Verfahren nach Anspruch 50 und ferner mit dem Schritt: Bereitstellen eines Griffs, an dem der Formeinsatz angebracht ist, wodurch der Griff zum abwechselnden Anordnen und Entfernen des Formeinsatzes aus der Vorrichtung zwischen Formzyklen verwendet werden kann.

52. Verfahren nach Anspruch 33, wobei der erste und zweite Optikhohlraum teilweise durch eine erste und eine zweite optische Oberfläche gebildet sind, die auf einem ersten bzw. einem zweiten Werkzeugeinsatz festgelegt sind.

53. Verfahren nach Anspruch 52 und ferner mit dem Schritt: Bereitstellen eines ersten und eines zweiten Hohlraumblocks, in denen der erste bzw. zweite Werkzeugeinsatz entfernbar angeordnet sind.

54. Verfahren nach Anspruch 53 und ferner mit dem Schritt: Bereitstellen eines Formeinsatzes mit einer ersten und einer zweiten optischen Oberfläche, die zusammen mit der ersten und zweiten optischen Oberfläche des ersten und zweiten Werkzeugeinsatzes den ersten bzw. zweiten Optikhohlraum festlegen.

55. Verfahren nach Anspruch 54, wobei der Formeinsatz zwischen dem ersten und zweiten Hohlraumblock entfernbar angeordnet ist.

56. Verfahren nach Anspruch 53 und ferner mit dem Schritt: Bereitstellen mindestens eines Haptikbildungshohlraums, der zwischen dem ersten und zweiten Hohlraumblock von der ersten und zweiten optischen Oberfläche radial nach außen gebildet ist.

57. Verfahren nach Anspruch 56 und ferner mit dem Schritt: Bereitstellen eines Formeinsatzes mit einer ersten und einer zweiten optischen Oberfläche, die zusammen mit der ersten und zweiten optischen Oberfläche des ersten und zweiten Werkzeugeinsatzes den ersten bzw. zweiten Optikhohlraum festlegen.

58. Verfahren nach Anspruch 57, wobei der Haptikbildungshohlraum mindestens teilweise durch den Formeinsatz festgelegt ist.

59. Verfahren nach Anspruch 57, wobei der Formeinsatz eine Ringfläche aufweist, die mindestens einen Teil des Haptikbildungshohlraums festlegt.

60. Verfahren nach Anspruch 59, wobei die erste und zweite optische Oberfläche des Formeinsatzes auf einem Werkzeugeinsatz gebildet sind, der von der Ringfläche umschrieben ist.

61. Verfahren nach Anspruch 60, wobei der Werkzeugeinsatz des Formeinsatzes an der Ringfläche klebend befestigt ist.

62. Verfahren nach Anspruch 61, wobei die Ringfläche ein Durchgangsloch aufweist, durch das Kleber eingespritzt werden kann, um den Formeinsatz-Werkzeugeinsatz an der Ringfläche zu befestigen.

63. Verfahren nach Anspruch 62 und ferner mit dem Schritt: Bereitstellen eines am Formeinsatz angebrachten Griffs.

64. Verfahren nach Anspruch 63 und ferner mit dem Schritt: Bereitstellen einer ersten und einer zweiten Nut, die im ersten und zweiten Hohlraumblock gebildet sind, in denen sich der Griff befindet, wenn der erste und zweite Hohlraumblock in Anlagebeziehung plaziert sind.

Revendications

1. Appareil de moulage par injection d'une lentille intraoculaire ayant des première et seconde optiques (12, 14), ledit appareil comprenant :

a) une première cavité optique pour former ladite première optique (12) ;

b) une seconde cavité optique pour former ladite seconde optique (14) ;
caractérisé en ce qu'il comprend en outre,

c) un premier sous-canal (70a') en communication fluidique avec ladite première cavité optique ; et

d) un second sous-canal (70b') en communication fluidique avec ladite seconde cavité optique.

2. Appareil selon la revendication 1, et comprenant en outre un canal principal (72) duquel lesdits premier et second sous-canaux (70a', 70b') bifurquent et s'étendent vers lesdites première et seconde cavités optiques, respectivement.

3. Appareil selon la revendication 1, dans lequel lesdits premier et second sous-canaux (70a', 70b') ont une section sensiblement circulaire.

4. Appareil selon la revendication 3, dans lequel ledit canal principal (72) a une section sensiblement circulaire.

5. Appareil selon la revendication 1 et comprenant en outre une ou plusieurs cavités haptiques (HC₁-HC₃) s'étendant entre et en communication fluidique avec lesdites première et seconde cavités optiques, lesdites une ou plusieurs cavités haptiques (HC₁-HC₃) pour former une ou plusieurs haptiques (16a-16c) s'étendant entre et interconnectant lesdites première et seconde optiques (12, 14), respectivement.

6. Appareil selon la revendication 1 et comprenant en outre un insert de moule (40) ayant des première et seconde surfaces optiques définissant en partie lesdites première et seconde cavités optiques, respectivement.

7. Appareil selon la revendication 6 et comprenant en outre un manche (42) auquel est attaché ledit insert de moule (40), moyennant quoi ledit manche (42) peut être utilisé pour placer et retirer en alternance ledit insert de moule (40) dudit appareil entre des cycles de moulage.

8. Appareil selon la revendication 6 et comprenant en outre des premier et second blocs de cavité (30, 32) ayant chacun une surface optique, ladite surface optique desdits premier et second blocs de cavité (30, 32) et lesdites première et seconde surfaces optiques dudit insert de moule (40) définissant ensemble lesdites première et seconde cavités optiques, respectivement.

9. Appareil selon la revendication 1, dans lequel lesdits premier et second sous-canaux (70a', 70b') s'étendent sensiblement horizontalement.

10. Appareil selon la revendication 9, dans lequel ledit canal principal (72) s'étend sensiblement horizontalement.

11. Appareil selon la revendication 1, adapté pour injecter un matériau liquide de lentille à travers lesdits premier et second sous-canaux (70a', 70b') sensiblement simultanément.

12. Appareil selon la revendication 1, dans lequel des première et seconde grilles d'injection (70a", 70b") sont définies à la jonction entre ladite première cavité optique et ledit premier sous-canal (70a'), et à la jonction entre ladite seconde cavité optique et ledit second sous-canal (70b'), respectivement, lesdites première et seconde grilles d'injection (70a", 70b") se rétrécissant chacune vers l'intérieur dans lesdites première et seconde cavités optiques, respectivement.

13. Appareil selon la revendication 12, dans lequel ledit rétrécissement est compris entre environ 5 et 25 degrés.

14. Appareil selon la revendication 12, dans lequel ledit rétrécissement est compris entre environ 10 et 20 degrés.

15. Appareil selon la revendication 12, dans lequel ledit rétrécissement est d'environ 15 degrés.

16. Appareil selon la revendication 1, dans lequel ladite première cavité optique est façonnée pour former une lentille positive, et ladite seconde cavité optique est façonnée pour former une lentille négative.

17. Appareil selon la revendication 16, dans lequel ladite première cavité optique est positionnée sous ladite seconde cavité optique.

18. Appareil selon la revendication 17 et comprenant en outre un insert de moule (40) ayant des première et seconde surfaces optiques définissant en partie lesdites première et seconde cavités de moule, respectivement.

19. Appareil selon la revendication 18 et comprenant en outre un manche (42) auquel est attaché ledit insert de moule (40), moyennant quoi ledit manche (42) peut être utilisé pour placer et retirer en alternance ledit insert de moule dudit appareil entre des cycles de moulage.

20. Appareil selon la revendication 1, dans lequel lesdites première et seconde cavités optiques sont formées en partie par les première et seconde surfaces optiques définies sur des premier et second inserts d'outil (50, 52), respectivement.

21. Appareil selon la revendication 20 et comprenant en outre des premier et second blocs de cavité, où lesdits premier et second inserts d'outil (50, 52) sont montés de manière amovible, respectivement.

22. Appareil selon la revendication 21 et comprenant en outre un insert de moule (40) ayant des première et seconde surfaces optiques qui, conjointement avec lesdites première et seconde surfaces optiques desdits premier et second inserts d'outil (50, 52), définissent lesdites première et seconde cavités optiques, respectivement.

23. Appareil selon la revendication 22, dans lequel ledit insert de moule (40) est monté de manière amovible entre lesdits premier et second blocs de cavité (30, 32).

24. Appareil selon la revendication 21 et comprenant en outre au moins une cavité formant haptique formée entre lesdits premier et second blocs de cavité (30, 32) radialement vers l'extérieur desdites première et seconde surfaces optiques.

25. Appareil selon la revendication 24 et comprenant en outre un insert de moule (40) ayant des première et seconde surfaces optiques qui, conjointement avec lesdites première et seconde surfaces optiques desdits premier et second inserts d'outil (50, 52), définissent lesdites première et seconde cavités optiques, respectivement.

26. Appareil selon la revendication 25, dans lequel ladite cavité formant haptique est définie au moins en partie par ledit insert de moule (40).

27. Appareil selon la revendication 25, dans lequel ledit insert de moule (40) comprend une surface annulaire qui définit au moins une partie de ladite cavité formant haptique.

28. Appareil selon la revendication 27, dans lequel lesdites première et seconde surfaces optiques dudit insert de moule (40) sont formées sur un insert d'outil circonscrit par ladite surface annulaire.

29. Appareil selon la revendication 28, dans lequel ledit insert d'outil dudit insert de moule (40) est fixé par adhésif à ladite surface annulaire.

30. Appareil selon la revendication 29, dans lequel ladite surface annulaire comprend un trou traversant au travers duquel un adhésif peut être injecté pour fixer ledit insert d'outil de l'insert de moule à ladite surface annulaire.

31. Appareil selon la revendication 30 et comprenant en outre un manche (42) attaché audit insert de moule (40).

32. Appareil selon la revendication 31 et comprenant en outre des première et seconde rainures formées dans lesdits premier et second blocs de cavité (30, 32), où ledit manche (42) réside lorsque lesdits premier et second blocs de cavité (30, 32) sont placés dans une relation de butée.

33. Procédé de moulage par injection d'une lentille intraoculaire ayant des première et seconde optiques, ledit procédé comprenant les étapes consistant à :

a) fournir une première cavité optique pour former ladite première optique ;

b) fournir une seconde cavité optique pour former ladite seconde optique ;

c) fournir un premier sous-canal en communication fluidique avec ladite première cavité optique ; et

d) fournir un second sous-canal en communication fluidique avec ladite seconde cavité optique.

34. Procédé selon la revendication 33 et comprenant en outre l'étape consistant à fournir un canal principal duquel lesdits premier et second sous-canaux bifurquent et s'étendent vers lesdites première et seconde cavités optiques.

35. Procédé selon la revendication 33, dans lequel lesdits premier et second sous-canaux ont une section sensiblement circulaire.

36. Procédé selon la revendication 35, dans lequel ledit canal principal a une section sensiblement circulaire.

37. Procédé selon la revendication 36 et comprenant en outre l'étape consistant à fournir une ou plusieurs cavités haptiques s'étendant entre et en communication fluidique avec lesdites première et seconde cavités optiques, lesdites une ou plusieurs cavités haptiques pour former une ou plusieurs haptiques s'étendant entre et interconnectant lesdites première et seconde optiques, respectivement.

38. Procédé selon la revendication 33 et comprenant en outre l'étape consistant à fournir un insert de moule ayant des première et seconde surfaces optiques définissant en partie lesdites première et seconde cavités optiques, respectivement.

39. Procédé selon la revendication 38 et comprenant en outre l'étape consistant à fournir un manche auquel est attaché ledit insert de moule, moyennant quoi ledit manche peut être utilisé pour placer et retirer en alternance ledit insert de moule dudit appareil entre des cycles de moulage.

40. Procédé selon la revendication 38 et comprenant en outre l'étape consistant à fournir des premier et second blocs de cavité ayant chacun une surface optique, ladite surface optique desdits premier et second blocs de cavité et lesdites première et seconde surfaces optiques dudit insert de moule définissant ensemble lesdites première et seconde cavités optiques, respectivement.

41. Procédé selon la revendication 33, dans lequel lesdits premier et second sous-canaux s'étendent sensiblement horizontalement.

42. Procédé selon la revendication 41, dans lequel ledit canal principal s'étend sensiblement horizontalement.

43. Procédé selon la revendication 33, dans lequel le matériau liquide de lentille est injecté à travers lesdits premier et second sous-canaux sensiblement simultanément.

44. Procédé selon la revendication 33, dans lequel les première et seconde grilles d'injection sont définies à la jonction entre ladite première cavité optique et ledit premier sous-canal, et à la jonction entre ladite seconde cavité optique et ledit second sous-canal, respectivement, lesdites première et seconde grilles d'injection se rétrécissant chacune vers l'intérieur dans lesdites première et seconde cavités optiques, respectivement.

45. Procédé selon la revendication 44, dans lequel ledit rétrécissement est compris entre environ 5 et 25 degrés.

46. Procédé selon la revendication 44, dans lequel ledit rétrécissement est compris entre environ 10 et 20 degrés.

47. Procédé selon la revendication 44, dans lequel ledit rétrécissement est d'environ 15 degrés.

48. Procédé selon la revendication 33, dans lequel ladite première cavité optique est façonnée pour former une lentille positive, et ladite seconde cavité optique est façonnée pour former une lentille négative.

49. Procédé selon la revendication 48, dans lequel ladite première cavité optique est positionnée sous ladite seconde cavité optique.

50. Procédé selon la revendication 49 et comprenant en outre l'étape consistant à fournir un insert de moule ayant des première et seconde surfaces optiques définissant en partie lesdites première et seconde cavités de moule, respectivement.

51. Procédé selon la revendication 50 et comprenant en outre l'étape consistant à fournir un manche auquel est attaché ledit insert de moule moyennant quoi ledit manche peut être utilisé pour placer et retirer en alternance ledit insert de moule dudit appareil entre des cycles de moulage.

52. Procédé selon la revendication 33, dans lequel lesdites première et seconde cavités optiques sont formées en partie par des première et seconde surfaces optiques définies sur des premier et second inserts d'outil, respectivement.

53. Procédé selon la revendication 52 et comprenant en outre l'étape consistant à fournir des premier et second blocs de cavité où lesdits premier et second inserts d'outil sont montés de manière amovible, respectivement.

54. Procédé selon la revendication 53 et comprenant en outre l'étape consistant à fournir un insert de moule ayant des première et seconde surfaces optiques qui, conjointement avec lesdites première et seconde surfaces optiques desdits premier et second inserts d'outil, définissent lesdites première et seconde cavités optiques, respectivement.

55. Procédé selon la revendication 54, dans lequel ledit insert de moule est monté de manière amovible entre lesdits premier et second blocs de cavité.

56. Procédé selon la revendication 53 et comprenant en outre l'étape consistant à fournir au moins une cavité formant haptique formée entre lesdits premier et second blocs de cavité radialement vers l'extérieur desdites première et seconde surfaces optiques.

57. Procédé selon la revendication 56 et comprenant en outre l'étape consistant à fournir un insert de moule ayant des première et seconde surfaces optiques qui, conjointement avec lesdites première et seconde surfaces optiques desdits premier et second inserts d'outil, définissent lesdites première et seconde cavités optiques, respectivement.

58. Procédé selon la revendication 57, dans lequel ladite cavité de formant haptique est définie au moins en partie par ledit insert de moule.

59. Procédé selon la revendication 57, dans lequel ledit insert de moule comprend une surface annulaire qui définit au moins une partie de ladite cavité formant haptique.

60. Procédé selon la revendication 59, dans lequel lesdites première et seconde surfaces optiques dudit insert de moule sont formées sur un insert d'outil circonscrit par ladite surface annulaire.

61. Procédé selon la revendication 60, dans lequel ledit insert d'outil dudit insert de moule est fixé par adhésif à ladite surface annulaire.

62. Procédé selon la revendication 61, dans lequel ladite surface annulaire comprend un trou traversant au travers duquel un adhésif peut être injecté pour fixer ledit insert d'outil de l'insert de moule à ladite surface annulaire.

63. Procédé selon la revendication 62 et comprenant en outre l'étape consistant à fournir un manche attaché audit insert de moule.

64. Procédé selon la revendication 63 et comprenant en outre l'étape consistant à fournir des première et seconde rainures formées dans lesdits premier et second blocs de cavité où ledit manche réside lorsque lesdits premier et second blocs de cavité sont placés dans une relation de butée.

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