Technical field
[0001]The present invention relates to intraocular lenses, and a manufacturing method thereof, for use in the treatment of cataracts.
BACKGROUND
[0002]Eye visibility is poor cloudy white and crystalline lens becomes to cataracts. Therefore, removing the lens was clouded by surgery, treatment to supplement the refractive power originally lens was responsible for other optical elements takes place. Currently, artificial lens, methods of inserting a so-called intraocular lens into the lens capsule is common.
[0003]Intraocular lens to be produced in an acrylic flexible material foldable many, can be inserted folded intraocular lens from the incision provided in the cornea or corneoscleral. Also, toric intraocular lens capable of reducing the astigmatism has been put to practical use. Toric intraocular lens is a intraocular lens having a cylinder power equivalent to a corneal astigmatism. Toric intraocular lenses, and inserting the combined cylinder axis of the lens astigmatic axis of the cornea, the structure positional deviation does not occur even after surgery obtained.
[0004]Further, intraocular lenses, but there are various types in accordance with the cases of the patient's eye, is constructed with an optical unit to supplement the basic refractive power, an intraocular lens support portion for fixing to the eye ing. Optic and the support portion is integral intraocular lenses one-piece, referred to as a multi-piece intraocular lens mounted support portions of different material than the optical portion.
[0005]The technique for providing the highest possible versatile intraocular lens and hardly affected by individual differences of the patient have been proposed (Patent Document 1). Further, techniques for reducing as much as possible the burden on the tissue within a patient's eye has also been proposed (Patent Documents 2 and 3).
CITATION
Patent Document
[0006]Patent Document 1: JP 2008-86508 JP
Patent Document 2: JP 61-87546 Patent Publication
Patent Document 3: JP-A 1-300948 JP
Summary of the Invention
Problems that the Invention is to Solve
[0007]Conventionally, in light of the characteristics of the time of bending of the support portion, it is necessary to prepare a one-piece and multi-piece intraocular lenses to be formulated in accordance with the state of the patient's eye. However, if you plan to store a variety of intraocular lenses, or expiration date accidentally course of intraocular lenses, or management becomes complicated in the intraocular lens, such may not be easy to secure storage location concern arises. In addition, also for the production company, or require different equipment depending on the type of intraocular lens to be produced, such as increases or a worker and inventory, the burden is increased concern from the point of view of the management and cost of manufacturing arise.
[0008]
　The disclosure of technology has been made in view of the above circumstances, and an object, scope in terms of characteristics at the time of bending of the supporting portion than the application range of the conventional single intraocular lens it is to realize a wide intraocular lenses.
Means for Solving the Problems
[0009]
　The intraocular lens of the present disclosure is an intraocular lens having an optical portion having a predetermined refractive power, and a support portion for maintaining the position of the eye of the optical portion, the support portion is formed of flexible material and a shaft portion formed by the main body and the elastic member being, at least a portion of the shaft portion is covered by the body portion, the end portion of the shaft portion is provided at a distance from the optical unit . Supporting portions of which the intraocular lens obtained, it is more elastic than the support portions of the conventional one-piece intraocular lens, since the supporting portion of the conventional multi-piece intraocular lens is flexible, conventional scope of the patient's eye can be achieved wide intraocular lens as compared with the one of the intraocular lens of one-piece or multi-piece.
[0010]
　Further, the second moment of the body portion, the recovery rate in returning to the natural state of the time of bending of the support portion, and the recovery rate in returning to the natural state of the time of bending of the support portion formed only by the soft material resilient may be the second moment such that the recovery rate between the recovery rate in returning to the natural state of the time of bending of the support portion formed only in wood. The shaft portion includes a distal end side of the supporting portion contains the most bent regions at the time of bending of the support portion may extend to the junction side. Further, the thickness of the optical axis of the optical portion in the portion which covers the shaft portion of the main body portion, the recovery rate in returning to the natural state of the time of bending of the support portion, bending of the supporting portion formed only in soft material may be the thickness such that the rate of recovery during the recovery rate in returning to the natural state of the time of bending of the support part formed only at a recovery rate and the elastic member in returning to the natural state when.
[0011]
　In the method of manufacturing the intraocular lens of the present disclosure is a method of manufacturing an intraocular lens having an optical portion having a predetermined refractive power, and a support portion for maintaining the position of the eye of the optical portion, the support portion is formed by a shaft portion formed by the main body and the elastic material formed by flexible material, at least a portion of the shaft portion is covered by the body portion, the end portion of the shaft portion, spaced from the optical unit It is provided. Further, by polymerizing a monomer of flexible material forming a guide for positioning the elastic member, after the elastic member is positioned by the guide may form the body portion by polymerizing a monomer of soft material. Alternatively, placing the elastic member to the bridge portion of the mold having a cross section bridging the elastic material, after the elastic member is placed on the bridge, to form the body portion by polymerizing a monomer of a soft material it may be. Further, after forming the main body portion, an elastic member may be cut out monomers polymerized soft material and the alignment to be included in the support portion.
The invention's effect
[0012]
　According to the present disclosed technology can be applied range from the viewpoint of the characteristics at the time of bending of the support portion to achieve a wide intraocular lens than the scope of a conventional single intraocular lens.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013]
[1] Figure 1 (a), (b) is a schematic diagram showing an example of the intraocular lens according to one embodiment.
It is a schematic diagram showing a modification of FIG. 2 intraocular lens.
3 is a graph showing an example of a compressive stress during the supporting portion of the intraocular lens according to one embodiment.
[4] FIG. 4 (a), (b) is a schematic diagram showing a measuring device for measuring the stress at the time of compression of the supporting portion of the intraocular lens according to one embodiment.
[5] FIG. 5 (a) ~ (c) is a diagram schematically showing an example of the method for manufacturing the intraocular lens according to one embodiment.
[6] FIG. 6 (a) ~ (c) is a diagram schematically showing an example of the method for manufacturing the intraocular lens according to one embodiment.
[7] FIG. 7 (a), (b) is a diagram schematically showing an example of the method for manufacturing the intraocular lens according to a modified example.
[8] FIG. 8 (a), (b) is a schematic diagram showing an example of the intraocular lens according to a modification.
DESCRIPTION OF THE INVENTION
[0014]
　The following describes embodiments of the present invention. In the following description, the technical scope of the present invention is not limited to the following embodiments.
[0015]
　Intraocular lens in accordance with the cases of the patient's eye and there are various types can be classified into two types of intraocular lenses roughly one-piece and multi-piece. Optic and the support portion is integral intraocular lenses one-piece, referred to as a multi-piece intraocular lens mounted support portions of different material than the optical portion. One-piece intraocular lens, since the support portion and the optical portion are integrated, has the following advantages and disadvantages compared to the multi-piece intraocular lenses.
[0016]
(Advantages of the one-piece intraocular lens)
- one can be prepared in the material.
- easy to achieve a production by the so-called mold process.
- there is no need to attach a later step the supporting portion, it is possible to simplify the manufacturing process tends to reduce the production cost.
· Since the thickness of the optical portion and the support portion is likely to design thinner intraocular lenses, easily inserted into the incision of the small incision.
- For the flexibility of the support portion is high, a small concern that the support portion is damaged eye tissue.
· Since the support portion is wider, when inserting the intraocular lens into the eye, a large contact area between the intraocular lens and the capsular bag, is difficult misalignment of the intraocular lens in the capsular bag.
(One-piece disadvantage of intraocular lenses)
and supported part of the elastic is low, the force pushing the ocular tissue by the repulsive force when the support portion is bent is small, the force to fix the position of the IOL in the eye weak.
- the force for pressing the optical portion in the posterior capsule is weak by the supporting portion, adhesiveness is lowered against posterior capsule of the edge of the optical portion, the effect of suppressing secondary cataract is lowered.
- due to the high adhesiveness of the support portion, such as by reduction dialing is difficult performed after inserting the intraocular lens into the eye (the dialing is an intraocular lens after insertion into the eye, the eye of the intraocular lens to increase the stability of the inner, in order to efficiently remove the viscoelastic material injected into the eye as a buffer refers to rotating the IOL about the optical axis of the optical unit.).
• If the posterior capsule cracks are present, since the intraocular lens can not be stabilized in the eye by a supporting unit, can not be adopted.
· To support portion is likely to break, it may be difficult to secure sewing.
• If the lens is large, the intraocular lens becomes insufficient bending of the support portion may not be sufficiently secured in the eye.
- an intraocular lens slow recovery from a folded state at the time of insertion into the eye, there is a case to give stress to the operator.
- the contact between the support and the lens capsule becomes insufficient during surgery, it may rotate unexpectedly intraocular lens in the eye.
[0017]
　On the other hand, the intraocular lens of the multi-piece has the following advantages and disadvantages compared to the one-piece intraocular lenses. Here, multi-piece intraocular lens refers to two supporting parts are connected intraocular lens into a single optical unit.
[0018]
(Advantages of the multi-piece intraocular lens)
for resilient-support portion is high, a large stress at the time of compression of the support portion.
· Low adhesion of the support portion.
· The support portion can be formed thin.
- For intraocular lens is a small concern that sticks to the capsular bag in the eye, it is easily performed reduction due to dialing.
· Support portion for the force to press the optical portion in the posterior capsule, the greater the effect of suppressing secondary cataract.
- and if the posterior capsule there is a crack, even if the lens capsule and Chin small band is fragile, the support and the eye tissue can be inserted without the need within the eye to be sewn.
· Low risk of support portion is broken, sewing easily fixed.
- even the lens is large, since a large repulsive force can be obtained only by the support portion is slightly bent, can be fixed intraocular lens in the eye.
(Disadvantages of multi-piece intraocular lens)
, since the support portion during manufacture it is necessary to secure the thickness of the portion for mounting the optical unit, possibly not suitable as an intraocular lens to be inserted into the incision of the small incision there is.
• The installation of the optical portion of the support portion may require work by skilled operators.
- it may be necessary to support portions device for attachment to an optical unit.
· An intraocular lens during insertion into the eye, because it can support part folded recovers unexpectedly, increase the burden on the patient's eye tissue when inexperienced surgeon treats an intraocular lens there is a concern.
· Since the adhesion between the lens capsule is low, the case of so-called toric intraocular lens for astigmatism reduction, when aligning the IOL in the eye, it will easily misaligned by rotation.
[0019]
　As described above, the intraocular lens and the multi-piece intraocular lens of one-piece, has its own advantages and disadvantages. For example, the possible small incision in adopting the intraocular lens of one-piece if experience or when surgery seeks to insert the intraocular lens is small surgeon performing surgery, in the eye the intraocular lens when the state of the lens capsule in view of the case and the above disadvantages of obtaining the stability is concerned, as such employ an intraocular lens of a multi-piece, intraocular some circumstances of the patient's eye condition or surgery it is necessary to select the lens.
[0020]
　Therefore, in this embodiment, it combines the advantages of the intraocular lens strengths and multi-piece of the above one-piece intraocular lenses, that is, elasticity and flexibility to provide both high intraocular lenses.
[0021]
　Figure 1 is a schematic diagram showing an example of the intraocular lens 10 in the present embodiment. 1 (a) is a diagram viewed in a direction parallel to the optical axis AX of the optical portion 11 of the intraocular lens 1, FIG. 1 (b), the intraocular lens 1 in the optical axis AX of the optical portion 11 it is a view seen in a direction perpendicular.
[0022]
　Intraocular lens 10 has two supporting portions 12 elongated plate-shaped to hold the optical unit 11 and the optical unit 11 in the eye having a predetermined refractive power. Further, the support portion 12 includes an optical unit 11 and the main body portion 121 which is integrally connected. The support portion 12 includes a shaft portion 122 covered with the body portion 121. The optical unit 11 and the support portion 12 are connected to each other via a joint 13. Shaft 122, the support portion 12 contains the most bending regions when bent under compressive load, such as in contact with the lens capsule, it is extended to the junction 13 side and the tip side of the supporting portion 12.
[0023]
　As an example, in FIG. 1 (a), it shows a region 14 which is most bent when the support portion 12 is bent under compressive load by a dotted circle. In the eye, the external force acting on the support member 12 is not locally considered to force point equal force is applied and the concentrically around the. Given this way, the support section 12, it can be said that a region which is the most bent from before the external force is most easily bent region. Incidentally, the most easily bent region in the support portion 12, soft material constituting the support portion 12 (described further below) to be considered to smallest area cross-sectional area of ​​the.
[0024]
　As a material of the main body portion 121 of the optical unit 11 and the support portion 12, soft material is used. Here, the soft material, refers to a flexible, not easily recover deformed material. As an example, soft material, hydrophobic acrylic materials, hydrophilic acrylic material, and a silicone material. Further, as the material of the shaft portion 122, the elastic material used. Here, the elastic member, will be easily deformed, repulsive force is large, which occurs during deformation, it refers to highly shape-memory material. As an example, the elastic material, polyvinylidene fluoride (PVDF) material, rubber material, polyimides material.
[0025]
　In the intraocular lens 10 in the present embodiment, the end portion 123 of the shaft portion 122 is provided apart from the optical unit 11. Incidentally, if the spaced ends 123 of the shaft 122 from the optical unit 11, a peripheral portion of the optical unit 11, i.e. the shaft portion 122 at the junction 13 is a coupling portion between the optical portion 11 and the support portion 12 is extended may be provided so as not to standing may be provided as a part of the shaft portion 122 extends to the junction 13. In the conventional multi-piece intraocular lenses, for connecting the support part to the optical unit, to ensure the thickness of the joint portion between the support portion optic (corresponding to the junction 13 of the present embodiment), i.e. the optical axis it is necessary to ensure a large cross sectional area as viewed from the AX direction. On the other hand, according to the intraocular lens 10 in the present embodiment, only the thickness of it is not necessary to connect the shaft 122 to the optical unit 11, the joint 13 is connected between the optical portion 11 and the body portion 121 is secured a good if you have. Therefore, according to the intraocular lens 10 in the present embodiment, it is possible to realize a joint thin compared to the junction of the conventional multi-piece intraocular lenses. Thus, the intraocular lens 10 can be said to be the intraocular lens to be inserted into more small incision in comparison to conventional multi-piece intraocular lenses.
[0026]
　Next, a description will be given stress in compression of the supporting portion 12 of the intraocular lens 10. The intraocular lens fixed in the eye, it is necessary intraocular lens a sufficient force to push the eye tissue. Since the intraocular lens can not move autonomously, forces resulting by an external force, i.e., the repulsive force of the support portion is a stress at the time of compression of the elastic force and the support portion of the support portion occurring when the support portion bent utilizing, intraocular lenses fixed in the eye.
[0027]
　2, the forces resulting intraocular lens 10 when fixing the intraocular shown schematically. In the eye, contacts the eye tissue (such as the capsular bag) in a state where the support portion 12 of the intraocular lens 10 is bent. At this time, the compressive load is applied from the eye tissue to support 12. With stress to compressive load is generated in the support portion 12, the elastic force due to the bending occurs. And, for the ocular tissues from the support portion 12, these stresses and elastic force is generated as a repulsive force of the support portion 12. Furthermore, like a typical intraocular lens, the supporting portion 12 of the intraocular lens 10 in the eye is projected to the cornea side of the optical unit 11. Therefore, the supporting portion 12 is radially of the intraocular lens 10, i.e. when compressed in a direction perpendicular to the optical axis of the optical unit 11, urging the optical unit 11 in the posterior capsule direction by the repulsive force of the support portion 12 the force is generated. The optical unit 11 includes the intraocular lens 10 is fixed to the eye by being urged to the rear 嚢側 by the repulsive force of the support portion 12.
[0028]
　Thus, the intraocular lens 10 is whether the fixed easily intraocular lens in the eye, it can be said that depends on the magnitude of the elastic force and compressive stresses during the support portion 12. In general, the magnitude of the elastic force and compressive stresses during the support portion, is larger in the multi-piece intraocular lenses than intraocular lenses one-piece. According to the intraocular lens 10 of the present embodiment, since the support portion 12 has a configuration having a body portion 121 and the shaft portion 122, the stress at the time of compression of the supporting portion 12, the support portion 12 only the main body portion 121 in greater than the stress at the time of compression of the support portion in the case of construction, the support portion 12 constituted by only the shaft portion 122 is smaller than the stress at the time of compression of the support portion in case of connecting directly to the shaft portion 122 in the optical unit it can be a thing. That is, in this embodiment according to the intraocular lens 10, larger than the stress when compressed by the supporting portion of the conventional one-piece intraocular lenses, during compression by the supporting portion of the conventional multi-piece intraocular lenses it can be made smaller than the stress.
[0029]
　3, the support portion 12 in a sample supporting unit 12 as described above was fabricated intraocular lens 10 having a body portion 121 and the shaft portion 122, a supporting portion in the sample of the conventional one-piece intraocular lenses, in the support portion in the sample of the conventional multi-piece intraocular lenses, an example of a graph for comparing a compressive load at the time of compression. Further, FIG. 4 (a), the (b), the an example of a measurement method used to create the graph of Figure 3 schematically. In the present embodiment, it is measured according to compressive load test ISO11979-3. In this measurement, the two support portions 21 of the intraocular lens 20 is abutted against the measuring instrument 30, for positioning the intraocular lens 20 to the measuring instrument 30. As shown in FIG. 4 (b), measuring device 30 has a general arcuate surface 31 which simulates a lens capsule of the eye, the part of the surface 31 of the support portion 21 of the intraocular lens 20 It abuts. The main body portion 32 of the instrument 30 can be moved in a direction perpendicular to the optical axis CX of the intraocular lens 20. By main body 32 moves, the compressive load corresponding to the displacement of the main body portion 32 is applied from the surface 31 to the support 21. Body portion 32 is connected such as a load cell for example, measuring a stress from the support portion 21 caused by the support portion 21 is deformed according to the displacement of the main body portion 32. The graph illustrating the measured stress in FIG. 3 is obtained. In the following description, it referred to the repulsive force generated when the support portion is subjected to an external force and compressive load.
[0030]
　In the graph of FIG. 3, numerals horizontal axis represents the number of samples, sample numbers A1 ~ A5 is a sample having a shaft portion 122 is a present embodiment, shaft portion 122 C1 ~ C3 was prepared in the same method the prototype does not have a sample number "1P" is a sample of a conventional one-piece intraocular lens, the sample number "3P" indicates a sample of a conventional multi-piece intraocular lenses, respectively. Further, in the graph, the vertical axis represents measured values ​​of the compressive load the (mN). The shape of the sample prototype intraocular lens 10, the lens thickness is 0.7 mm ~ 0.9 mm of the optical unit 11, the supporting portion and the total length including the optical unit is 13.0 mm, the thickness of the support portion 0. 35 mm, the width of the support portion is 0.3 mm ~ 0.8 mm, since it is equivalent to the conventional one-piece intraocular lens, the equivalent size of the switching and the case of inserting a conventional one-piece intraocular lens It is considered to be inserted intraocular lens of the present embodiment to a retractor.
[0031]
　From the graph shown in FIG. 3, according to the support portion 12 which sample number according to the samples of the intraocular lens 10 in the present embodiment is A1 ~ A5, the conventional one-piece intraocular lens (sample number "1P") numerical compressive load is larger than the support portion. Further, according to the support portion 12 which sample number is related to the sample is A1 ~ A5, than the support portions of the conventional multi-piece intraocular lens numerical compressive load is small. That is, the compression load of the supporting portion 12 of the intraocular lens 10 of this embodiment has an intermediate compressive load support portion of the support portion and the multi-piece intraocular lens of the conventional one-piece intraocular lens . Therefore, the intraocular lens having a shaft portion in this embodiment is the same as the outer shape as a conventional one-piece intraocular lenses, compressive load is large, it is believed to improve the fixation in the eye. Further, the elastic is improved that cumbersome too strong as in the conventional multi-piece intraocular lenses.
[0032]
　In the present embodiment, from the viewpoint of the second moment of soft material forming the body portion 121 of the support portion 12, sufficient cross-sectional secondary compared to the support portion of the conventional one-piece intraocular lens it can be said that the main body portion 121 so as to have a moment is formed. Here, the second moment, the members of the so-called beam member, is an amount representing was difficulty modifications to the bending moment. The value of the second moment of the cross section is changed in the members also changes. On the other hand, the same sample C1 ~ C3 manufactured by the manufacturing method is the load of the compression equivalent to the intraocular lens of the conventional one-piece, eye conventional one-piece Without shank in method employed in this embodiment it can be manufactured inner lens similar to intraocular lens.
[0033]
　Also was confirmed by visual observation time from folded state as when the support portion of the actual operation of each sample of the intraocular lens in the present embodiment described above until restored to a natural state, the conventional one-piece intraocular shorter than the support portion of the inner lens, it was confirmed that the longer the supporting part of the conventional multi-piece intraocular lenses.
[0034]
　Furthermore, the recovery rate of the supporting portion of each sample of the intraocular lens in this embodiment was the rate that would have no concern that hinder the practitioner of the operator even during surgery. The support portion of each sample of the intraocular lens in this embodiment can not confirm the phenomenon does not recover to the natural state. In a conventional one-piece intraocular lenses, Given that the adhesive in which the support portion has may not recover the natural state because the stability in the eye of the intraocular lens in this embodiment, conventional It is considered to be higher than the one-piece intraocular lens. Furthermore, the volume of the entire intraocular lens in each sample of the intraocular lens in this embodiment, since it is equivalent to the conventional one-piece intraocular lenses, insertion instruments for intraocular lenses of conventional one-piece, intraocular lens of this embodiment is also could be used.
[0035]
　Next, with reference to FIG. 5 (a) ~ (c), a description will be given of an example of a method of manufacturing the intraocular lens 10 in the present embodiment. In this manufacturing method, a transparent flat glass plate two, shim ring (thickness: 0.1 mm ~ 0.3 mm), the material described above as an elastic material, a resin type used in the production of conventional one-piece intraocular lens , using a monomer of the material described above as a soft material.
[0036]
　First, placing the shim ring on a piece of flat glass, placing the elastic member in the opening of the shim ring. The thickness of the shim ring is greater than the thickness of the elastic material is desirably 2 or less thick thirds of the thickness of the support portion at the time of manufacturing is complete of the intraocular lens. Further, the shim ring may be formed of a magnetic material.
[0037]
　Then, by injecting monomers of flexible material in the opening of the shim ring, the other one flat glass is placed so as to sandwich the shim rings with flat glass. In this case, to allow air bubbles to the monomer does not occur. Further, the elastic material so as not to contact the shim rings. In the case where the shim ring is formed of a magnetic material, it may be aligned by moving the shim rings with a magnet from the top of flat glass.
[0038]
　Then kept in a temperature environment in which the monomer of soft material to initiate polymerization, the monomer is polymerized. Figure 5 (a), shows an example of the state of each member at the time of polymerizing monomers. As shown in FIG. 5 (a), between two flat glass 100, 110, shim ring 200, monomer 300 of a soft material, the shaft portion 400 formed of an elastic material is interposed, respectively. Incidentally, the shaft portion 400 formed of an elastic material, the shaft portion 122 of the support portion 12 at the time of completion of manufacture of the intraocular lens. At this time, the two flat glass 100, 110 that is fixed by sandwiching a magnet, it is possible to carry out the polymerization of the monomers and more reliably.
[0039]
　After the polymerization of the monomers is complete, cut the sheet of the monomers polymerized containing the shaft into a suitable shape. As an example, as shown in FIG. 5 (b), cut sheet 410 that includes a shaft portion 400 from monomers 300 polymerization is complete in the shape indicated by the dotted line. Then, the sheet 410 was cut and placed in the bottom of the resin mold type. The the resin mold has an area which is provided for the support of the intraocular lens, placing the sheet 410 in the area. Here, the upper and lower mounting sheets 410, the surface support portion is exposed to the surface for placing the sheet 410 so that the upper. Thus, by injecting the monomers flexible material in the next step, it is possible to cover the entire elastic member by a flexible material. Incidentally, it may be mounted to the upper and lower sheets 410 Conversely, this case, since the portion where the elastic member is not covered by the soft material becomes lower, even by injecting monomers of flexible material in the next step , elastic material will remain left portion not covered with soft material. How to the upper and lower sheets 410 may be appropriately selected.
[0040]
　Figure 5 (c) shows an example of a state of mounting the sheet 410, 411 includes a resilient member 400 and 401 to the resin mold 500. The elastic member 401 and the sheet 411 is prepared similarly to the elastic member 400 and the sheet 410. As shown in FIG. 5 (c), a sheet 410 that includes a resilient member 400 so as to sandwich the fabrication area 510 of the optical portion of the intraocular lens is placed. Note that the resin mold, to assist in alignment when placing the sheet 410 may be protrusions or bank in a portion that does not constitute an intraocular lens is provided. Further, as the processing position can be seen in processing the outer shape of the intraocular lens, for example, mark a landmark in the resin flange region may be attached.
[0041]
　Next, the monomer of flexible material is injected into the resin mold, and sealed covering the upper die of the resin type. In this case, to allow air bubbles to the monomer does not occur. The position of the sheet of elastic material is placed above is prevented displaced by being pushed by the monomer. Then, store it in a temperature environment in which the monomers of the flexible material is polymerized to complete the polymerization.
[0042]
　After the polymerization of the monomers is complete, cut to fit the resin mold to the shape of the intraocular lens. At this time, alignment is performed such that the elastic material included in the support portion. This alignment mark for positioning of the above to be in the resin mold can be performed more easily. Cut intraocular lenses through a manufacturing process of a conventional one-piece intraocular lenses, intraocular lens of the present embodiment is completed.
[0043]
　Next, referring to FIG. 6 (a) ~ (c), a description will be given of an example of a method of manufacturing the intraocular lens in this embodiment. In this manufacturing method, the intraocular lens has been prepared resin mold for the manufacture of the present embodiment (the upper mold, the lower mold), materials described above as an elastic material, used monomer materials mentioned above as soft material. Further, the lower die of the resin mold are denoted by mark for alignment of the material. Further, the upper die of the resin mold, a guide used to position the elastic material forming the supporting portion is provided.
[0044]
　First, the lower mold of the resin mold, a guide for positioning of the elastic member is formed by polymerizing monomers of the soft material. The upper mold, the mold is formed so as to polymerize the monomer is injected into the lower die in the guide shapes. Guide shape, the polymerization of the monomers of the flexible material to be performed later easily, and shaped to limit the position of the elastic body. The guide is provided making region of the support portion in the lower mold. The height of the guide mounting surface is higher than the thickness of the elastic member is set to be lower than the thickness of the body of the intraocular lens to be manufactured. Furthermore, in the area for mounting the elastic material, thickness of the polymerized soft material forming the guide so as for example a 0.1mm or more. At the time of polymerizing the monomer guide, it may be present soft material in the manufacturing area of ​​the optical portion of the lower mold. Because the monomers polymerized to guide also the other upper mold surface of which covers the monomers during the polymerization of the monomers in the soft material to be performed later by a mirror surface, the transparency of the optical portion of the finally obtained it can be ensured. Next, the lower mold of the resin mold, superimposing the upper die mold guide is formed, when the guide is formed polymerization of the monomers is complete, remove the upper mold from the lower mold, with a guide elasticity placing the body in the lower mold.
[0045]
　In FIG. 6 (a), said guide 600-603 formed by soft material in the lower mold 900 of the resin type, placed on the elastic member 700, 701 in the lower mold 900, the flexible material 800 forming the optical portion show. As shown in FIG. 6 (a), rests the elastic member 700 and 701 so as to be interposed between the guide 600-603 in a top view of the lower die, the resilient member 700 and 701 guide 600-603 It is positioned. Elastic member 700 and 701, shaft portion 122 next to the intraocular lens 10, since it is placed at a position away from the flexible member 800 to form the optical portion 11, the shaft portion 122 in the intraocular lens 10 after production configuration which is spaced apart from the optical unit 11 are realized.
[0046]
　Then, by injecting monomers of soft material, covering the lower mold in a different upper mold, carrying out the polymerization of the monomers. In FIG. 6 (b), the lower die 900, shows an example of a state in which the polymerization of the monomers is complete. FIGS. 6 (a) guide 600-603 formed in, because the monomer is injected in the periphery, are lost at this stage. After the polymerization of the monomers is complete, cutting out the outer shape of the intraocular lens after the alignment for cutting out the intraocular lens. In FIG. 6 (c), shows an example of an intraocular lens to be cut from the lower die 900. As shown in FIG. 6 (c), from the lower mold 900, the monomers of the region containing the soft material 800 for forming the elastic member 700 and 701 and an optical part formed by polymerization is cut out. The area surrounding the elastic member 700 and 701 are cut with a margin of only supporting portions 12 and the joint portion 13 is formed. Cut intraocular lenses through a manufacturing process of a conventional one-piece intraocular lenses, intraocular lens of the present embodiment is completed.
[0047]
　Supporting portion of the intraocular lens 10 obtained by the above manufacturing method 12 includes a main body 121 formed by the shaft portion 122 and the flexible member 800 which is formed of an elastic material, the body portion 121 of the shaft portion 122 together provided so as to cover, at the junction 13 of the support portion 12 and the optical unit 11, since has a structure in which the shaft portion 122 is spaced apart from the optical unit 11, when the support portion 12 is bent repulsive force generated is a magnitude of the repulsive force between the repulsive force of the support portions of the conventional support of the one-piece intraocular lens repulsive force and the conventional multi-piece intraocular lenses. As a result, even if the adoption of the conventional one-piece intraocular lens or a conventional multi-piece intraocular lenses Given the shortcomings illustrated above is difficult, from the viewpoint of stress during elastic force and compression of the support portion , it can be said that the intraocular lens 10 of this embodiment can be employed as the intraocular lens fits the conditions of the patient's eye.
[0048]
　Above is the description of the present embodiment, the configuration of the intraocular lens is not limited to the above embodiments, and various modifications within a range that does not lose the technical idea and the identity of the present invention it is possible. Hereinafter, FIGS. 7 (a) modification of the manufacturing method of the above embodiment will be described with reference to (b).
[0049]
　Figure 7 (a), (b), as shown Figure in top view and side view of the lower mold schematically, in this modification, in place of the guide 600-603, the shaft portion of the support portion 12 122 and bridge portions 1300-1303 to support an elastic material formed is provided lower die 1200. Bridge portions 1300-1303 may be, for example, be formed by a technique similar to the guide 600-603 polymerizing monomers of soft material. Then, the elastic member 1000 is placed, the resilient member 1001 is placed on the bridge portion 1302 on the bridge 1300 and 1301. In a state where the elastic member 1000, 1001 is placed on the bridge portion 1300 to 1303, by injecting and polymerizing the monomers in the same manner as described above soft material, it is possible to manufacture an intraocular lens.
[0050]
　FIG. 8 (a), the (b), the an example of the intraocular lens 1500 produced in the present modification. Incidentally, the same reference numerals are given to the same components as the above embodiments, the detailed description thereof is omitted. In this modification, the portion abutting the bridge portion 1300 to 1303 of the elastic member 1000 and 1001, since the soft material is not injected, the support portion 1400 of the intraocular lens 1500 after production, the shaft portion 122 is the main body portion having portions 1401-1404 that are not covered with the 121. In this modified example, by changing the number and size of the portion that is not covered with the main body portion 121 which is provided in a portion of the shaft portion 122, to change the repulsive force, such as stress in compression of the support portion 1400 can.
[0051]
　The partial 1401-1404 which is not covered with the main body portion 121 of the shaft 122, the support portion 1400 is provided on the portion other than the most bent when bent.
[0052]
　In the above description, an example of forming an optical surface at mold method, may be formed optical surface by processing the optical surface after polymerization.
DESCRIPTION OF SYMBOLS
[0053]
10 intraocular lens
11 optical unit
12 supporting portion
121 body portion
122 shaft portion
13 junction
500,900,1200 resin type
1300-1303 bridge
portion which is not covered with the 1401-1404 body portion

The scope of the claims
[Requested item 1]
A intraocular lens having a supporting portion for maintaining the optical portion having a predetermined refractive power, a position in the eye of the optical portion,
　the support portion includes a main body portion and an elastic formed by the flexible material and a shaft portion formed in wood,
　wherein at least a portion of the shaft portion is covered by the main body portion,
　an end portion of the shaft portion are provided apart from said optical unit
that intraocular lens according to claim.
[Requested item 2]
　The second moment of the body portion, the recovery rate in returning to the natural state of the time of bending of the support portion, and the recovery rate in returning to the natural state of the time of bending of the support portion formed only by the flexible material eye according to claim 1, wherein a cross sectional secondary moment such that the recovery rate between the elastic member only recovery rate in returning to the natural state of the time of bending of the formed supporting portions at it, characterized in the inner lens.
[Requested item 3]
　The shank, eye according to claim 1 or 2, wherein the distal end side of the supporting portion contains the most bent regions at the time of bending of the support portion and the extend in the optical portion, it is characterized by the inner lens.
[Requested item 4]
　Support thickness in the optical axis direction of the optical portion in a portion that covers the shaft portion of the body portion, the recovery rate in returning to the natural state of the time of bending of the support portion, which is formed only by the flexible material parts is a recovery speed to become such thickness between recovery rate in returning to the natural state of the time of bending of the support part formed only at the recovery rate in returning to the natural state said elastic member during bending of, the intraocular lens according to any one of claims 1 to 3, characterized in that.
[Requested item 5]
　An optical portion having a predetermined refractive power, wherein a manufacturing method of the intraocular lens having a supporting portion for maintaining the position of the eye of the optical unit,
　in the main body portion and the elastic material formed by flexible material by a shaft portion formed to form the supporting portion,
　wherein at least a portion of the shaft portion is covered by the main body portion,
　an end portion of the shaft portion are provided apart from said optical unit
that method of manufacturing an intraocular lens according to claim.
[Requested item 6]
　By polymerizing the monomers of the soft material to form a guide for positioning the elastic member,
　after said elastic member is positioned by the guide, to form the main body portion by polymerizing a monomer of the flexible material
, characterized in that method for producing intraocular lenses according to claim 5,.
[Requested item 7]
　Wherein mounting the elastic member to said bridge portion of the mold having a cross section of crosslinking the elastic material,
　after said elastic member to said bridge portion is placed, said body by polymerizing a monomer of the flexible member forming a part
manufacturing method of an intraocular lens according to claim 5, characterized in that.
[Requested item 8]
　After forming the main body portion, and an alignment such that the elastic member is included in the support portion is cut out of the monomer of the polymerized soft material, intraocular according to claim 6 or 7, characterized in that method of manufacturing a lens.