Patent Grant
9492272
1. Field
This application relates generally to the field of intraocular devices. More particularly, this application is directed to intraocular implants and lenses (IOLs), with an aperture to increase depth of focus (e.g. “masked” intraocular lenses) and methods of making.
2. Description of the Related Art
The human eye functions to provide vision by transmitting and focusing light through a clear outer portion called the cornea, and further refining the focus of the image by way of a crystalline lens onto a retina. The quality of the focused image depends on many factors including the size and shape of the eye, and the transparency of the cornea and the lens.
The optical power of the eye is determined by the optical power of the cornea and the crystalline lens. In a normal, healthy eye, sharp images of distant objects are formed on the retina (emmetropia). In many eyes, images of distant objects are either formed in front of the retina because the eye is abnormally long or the cornea is abnormally steep (myopia), or formed in back of the retina because the eye is abnormally short or the cornea is abnormally flat (hyperopia). The cornea also may be asymmetric or toric, resulting in an uncompensated cylindrical refractive error referred to as corneal astigmatism.
A normally functioning human eye is capable of selectively focusing on either near or far objects through a process known as accommodation. Accommodation is achieved by inducing deformation in a lens located inside the eye, which is referred to as the crystalline lens. Such deformation is induced by muscles called ciliary muscles. In most individuals, the ability to accommodate diminishes with age and these individuals cannot see up close without vision correction. If far vision also is deficient, such individuals are usually prescribed bifocal lenses.
This application is directed to intraocular implants for improving the vision of a patient, such as by increasing the depth of focus of an eye of a patient. The intraocular implants can include a mask having an annular portion with a relatively low visible light transmission surrounding a relatively high transmission central portion such as a clear lens or aperture. This construct is adapted to provide an annular mask with a small aperture for light to pass through to the retina to increase depth of focus, sometimes referred to herein as pin-hole imaging or pin-hole vision correction. The intraocular implant may have an optical power for refractive correction. For example, the mask can be embodied in or combined with intraocular lenses (IOLs). The intraocular implant may be implanted in any location along the optical pathway in the eye, e.g., as an implant in the anterior or posterior chamber.
IOLs have been developed that provide a safe and effective surgical solution for cataracts. These lenses are surgically implanted after removal of a cataractous natural lens of the eye, restoring clarity and providing a replacement for the optical power that was removed. In a successful IOL implantation, the patient is typically emmetropic afterwards, meaning that their eye is focused for distance. However, conventional IOLs cannot accommodate to focus at different distances, so the patient typically needs additional correction (e.g., reading glasses) to see near objects clearly. Intraocular implants disclosed herein provide an improvement over presently available IOLs by incorporating a “mask” in the form of an aperture that improves depth of focus.
In certain embodiments, an intraocular device includes a lens body. The lens body includes an anterior and posterior surface. The posterior surface includes a first convex portion, a second concave portion and a third convex portion. The second concave portion is adjacent the first convex portion and the third convex portion. The third convex portion is annular and surrounds the second concave portion, and the second concave portion is annular and surrounds the first convex portion. An optical power between the first convex portion and the anterior surface is positive and an optical power between the third convex portion and the anterior surface is positive. The lens body further includes a mask positioned between the second concave portion and the anterior surface.
In certain embodiments, a lens body of an intraocular device includes a first surface and a second surface. A first portion of the first surface is convex, a second portion of the first surface is concave, and a third portion of the first surface is convex. The second portion is adjacent the first portion and the third portion. The lens body further includes a mask positioned to block a substantial portion of optical aberrations that would be created by the light passing through the second portion of the first surface.
In certain embodiments, an intraocular device includes a lens body with a positive optical power. The lens body includes an outer region and a recessed central region. At least a portion of the recessed central region includes a thickness less than at least a portion of the outer region. The lens body further includes a mask coupled with a curved transition between the outer region the recessed central region.
In certain embodiments, a method of making an intraocular device includes providing a lens body with a first surface and a second surface. The method further includes forming a convex surface on a first portion of the first surface, a concave surface on a second portion of the first surface and a convex surface on a third portion of the first surface. The second portion is adjacent the first portion and the third portion. The method also includes attaching a mask to the lens body that is positioned to block a substantial portion of the light passing through the second portion of the first surface.
In certain embodiments, a method of making an intraocular device includes forming a rod with an optically transparent inner region along a length of the rod, an optically transparent outer region along the length of the rod and a substantially optically non-transparent region along the length of the rod between the inner region and the outer region. The substantially non-transparent region can be a middle region, as discussed below. The method also can include sectioning the rod along a plane substantially perpendicular to an axis parallel to the length of the rod to form a lens body with a first surface and a second surface. The method also can include forming a convex surface on a first portion of the first surface. The first portion can correspond to the inner region of the sectioned rod. The method can include forming a concave surface on a second portion of the first surface. The second portion can correspond to the non-transparent region. The method can include forming a convex surface on a third portion of the first surface. The third portion can correspond to the outer region. The second portion is adjacent the first portion and the third portion. In some embodiments, the non-transparent region is positioned such that, in use, the non-transparent region blocks a substantial portion of the light passing through the second portion of the first surface.
In certain embodiments, a method of making an intraocular device includes forming a lens body around a mask. The mask includes an aperture and an annular region, and the lens body comprising a first surface and a second surface. The method further includes forming a convex surface on a first portion of the first surface, a concave surface on a second portion of the first surface and a convex surface on a third portion of the first surface. The second portion is adjacent the first portion and the third portion. Forming the lens body around the mask includes locating the mask within the lens body such that, in use, the mask blocks a substantial portion of the light passing through the second portion of the first surface.
In certain embodiments, an intraocular implant includes an implant body. The implant body can include a pin-hole aperture in the implant body, and a mask substantially around the pin-hole aperture. The implant body can further include an outer hole region substantially outside an outer perimeter of the mask. The outer hole region can include at least one outer hole and at least one connection portion. An outer region of the implant body can be attached to the mask by the at least one connection portion.
In some embodiments, an intraocular device includes a lens body comprising a surface with a transition zone, the transition zone configured to reduce a thickness of the lens body along an optical axis of the lens body, and a mask configured to block a substantial portion of optical aberrations that would be created by light passing through the transition zone.
In further embodiments, an intraocular device includes a lens body comprising a first surface and a second surface. The first surface comprises a first portion, a second portion and a third portion. An optic axis of the lens body passes through the first portion, and the second portion is between the first portion and the third portion. The intraocular device can also include a mask positioned between the second surface and the second portion of the first surface. A distance from the first portion neighboring the second portion to a plane perpendicular to the optic axis and tangent to the second surface can comprise a first distance, and a distance from the third portion neighboring the second portion to the plane perpendicular to the optic axis and tangent to the second surface can comprise a second distance greater than the first distance.
In other embodiments, a method for improving the vision of a patient includes providing an intraocular device comprising a lens body comprising a surface with a transition zone. The transition zone can be configured to reduce a thickness of the lens body along an optic axis of the lens body, and the intraocular device can further include a mask configured to block a substantial portion of optical aberrations that would be created by light passing through the transition zone. The method can further include inserting the intraocular device into an intraocular space of an eye.
In certain embodiments, an intraocular implant includes an implant body comprising an outer surface that includes a posterior surface and an anterior surface, an opaque mask positioned between the posterior surface and the anterior surface of the implant body. The mask comprising an aperture. The intraocular implant can further include a support member coupled to the mask and extending from the mask to the outer surface of the implant body. The support member can extend from the mask to the posterior surface of the implant body. A first portion of the support member neighboring the mask can have a first cross-sectional area parallel the mask and a second portion of the support member neighboring the posterior surface can have a second cross-sectional area parallel the mask that is less than the first cross-sectional area. The support member may be configured to be removable from the intraocular implant. The support member may include a plurality of holes characterized in that at least one of the hole size, shape, orientation, and spacing of the plurality of holes is varied to reduce the tendency of the holes to produce visible diffraction patterns.
In certain embodiments, a method of making an intraocular implant includes providing an opaque mask comprising an aperture and at least one support member coupled to the mask, positioning the mask within a mold chamber such that the at least one support member is coupled to the mold chamber so that the mask resists movement, and flowing a lens material into the mold chamber so that at least a portion of the mask is encased within the lens material. The method may further include removing at least a portion of the at least one support member after injecting the lens material.
In other embodiments, a method of making an intraocular implant includes coupling an opaque mask comprising an aperture to a surface of a mold chamber, and flowing a lens material into the mold chamber to form an optic coupled to the mask.
In further embodiments, a method of making an intraocular implant includes removing a portion of a surface of an optic to form an annular cavity around an aperture region, at least partially filling the cavity with an opaque material, removing at least some of the aperture region and a central region of the optic to reduce a thickness of the aperture region of the optic. At least some of the opaque material may remain on the surface of the optic to form an opaque mask.
In another embodiment, a method of making an intraocular implant includes providing an optic with an annular cavity around an aperture region, at least partially filling the cavity with an opaque material, removing at least some of the aperture region and a central region of the optic to reduce a thickness of the aperture region of the optic. At least some of the opaque material can remain on the surface of the optic to form an opaque mask.
In even further embodiments, a method of making an intraocular implant includes positioning an opaque mask with an aperture within a mold cavity such that the mask is not in physical contact with the mold cavity, and injecting an implant body material into the mold cavity to form an implant body around the mask. For example, the mask can be positioned with magnetic fields or with wires extending from the mask to a frame outside of the mold cavity.
In certain embodiments, a intraocular implant includes an implant body comprising a body material and a mask with an aperture positioned within the implant body. The mask can include a plurality of holes that extend between a posterior surface and an anterior surface of the mask. The body material can extend through the plurality of holes of the mask, and the plurality of holes can be characterized in that at least one of the hole size, shape, orientation, and spacing of the plurality of holes is varied to reduce the tendency of the holes to produce visible diffraction patterns. The plurality of holes may be positioned at irregular locations. A first plurality of the holes may include first hole size, shape or spacing and at least another plurality of holes may include a second hole size, shape, or spacing different from the first holes size, shape, or spacing. A first plurality of the holes may include first hole size, a second plurality of the holes may include a second hole size different from the third hole size, and a third plurality of holes may include a third hole size different from the first holes size and the second hole size.
In certain embodiments, an intraocular implant includes an implant body configured to be implanted into a sulcus region of an eye of a patient. The implant body can include an aperture that is at least partially surrounded by an opaque region forming a mask and an outer hole region substantially outside an outer perimeter of the mask. The outer hole region can include at least one outer hole and at least one connection portion, and the outer hole region can have an incident visible light transmission of at least 90%. The implant body may also include an outer region attached to the mask by the at least one connection portion.
In other embodiments, a method of making an intraocular implant includes providing an implant body configured to be implanted into a sulcus region of an eye of a patient, forming an aperture in the implant body by removing a portion of the implant body, and forming at least one opening between the outer edge of the structure and a opaque mask region that neighbors the aperture.
This application is directed to intraocular implants and methods of implanting intraocular implants. The natural lens of an eye is often replaced with an intraocular lens when the natural lens has been clouded over by a cataract. An intraocular lens may also be implanted into the eye to correct other refractive defects without removing the natural lens. The intraocular implants of the preferred embodiments include a mask adapted to provide a small aperture for light to pass through to the retina to increase depth of focus, sometimes referred to herein as pinhole imaging or pinhole vision correction. The intraocular implants may be implanted in the anterior chamber or the posterior chamber of the eye. In the posterior chamber, the implants may be fixated in the ciliary sulcus, in the capsular bag, or anywhere an intraocular implant is fixated. In some embodiments discussed below, the intraocular lenses have a reduced thickness in a central region compared to conventional intraocular lenses. The reduced thickness in the central region can help improve implantation of the intraocular lens. In further embodiments discussed below, intraocular implants can have an outer hole region (e.g. perforated region) to improve a patient's low light vision.
I. Intraocular Implants with Reduced Thickness
Several alternatives to fixed-focus IOLs have been developed, including multifocal IOLs and accommodating IOLs that attempt to provide the ability to see clearly at both distance and near. Multifocal IOLs do provide good acuity at both distance and near, but these lenses typically do not perform well at intermediate distances and are associated with glare, halos, and night vision difficulties associated with the presence of unfocused light. Accommodating IOLs of several designs have also been developed, but none so far has been able to replicate the function of the natural crystalline lens. IOLs with apertures have been described by Vorosmarthy (U.S. Pat. No. 4,976,732). These devices, however, do not attempt to change focus from far to near, but merely attempt to reduce the blurry image from defocus to a level where a presbyopic emmetrope can read. Notably, Vorosmarthy did not address the issue of reducing thickness of a masked IOL for application in small-incision surgery.
Some embodiments of the present application provide a masked IOL with a thinner optic than has been known in the art. The advantage to a thinner optic is that the IOL can be inserted through a smaller incision into the eye. Since corneal incisions tend to distort the cornea and impair vision, reducing the size of the incision will improve the quality of vision. The optic is made thinner by means similar to a Fresnel lens, where alternating concentric zones provide focusing power and height steps. While the thickness reduction possible with a Fresnel lens is significant, the height steps are optically inappropriate for clinical application. They do not focus light to an image at the fovea, but instead scatter light, leading to dysphotopsias (streaks, shadows, halos, etc.) in the patient's vision. By combining Fresnel-type height steps with a mask that blocks light from passing through the steps and allows light to pass only through the focusing surfaces, one can eliminate the dysphotopsias associated with a common Fresnel lens, obtaining the benefit of reduced thickness without introducing unwanted optical effects.
Generally, intraocular implants are implanted into the eye by rolling up an intraocular implant and inserting the rolled up intraocular implant into a tube. The tube is inserted into an incision in the eye, and the intraocular implant is ejected out of the tube and deployed within the eye. Intraocular implants can be implanted within the lens capsule after removal of the natural lens, or in the anterior chamber, posterior chamber, and can be coupled with or attached to the ciliary sulcus (sometimes referred to herein as “sulcus-fixated”). Depending on the location of the intraocular implant within the eye, dimensions of the intraocular implant, including but not limited to the aperture of the mask, may be adjusted. By reducing the thickness of in the central region of the intraocular lens, the intraocular lens can be rolled up tighter and inserted into a smaller tube. A smaller incision can be made in the eye if a smaller tube is used. The result is a less invasive procedure with quicker recovery time for the patient. Also, compared with a conventional posterior chamber phakic intraocular lens, a reduced thickness lens that is fixated in the ciliary sulcus will allow more space between the intraocular lens posterior surface and the natural crystalline lens surface, thereby reducing the potential for contact between these surfaces.
In certain embodiments, an intraocular lens 100 includes a lens body 102 with an optical power to refract light and correct refractive errors of the eye. Certain embodiments are illustrated in
In certain embodiments, the lens body 102 includes a posterior surface 110 and an anterior surface 112, as illustrated in
The intraocular lens 100 can include a mask 108 that can be positioned to block a substantial portion of light that would pass through the second portion 114 transition zone of the posterior surface 110. “Blocked” as used in this context includes preventing at least a portion of light from passing through the mask, as well as preventing substantially all the light from passing through the mask. If the mask 108 did not block the light rays that would pass through the second portion 114, aberrations would result since the refraction of light (e.g. optical power, etc.) in the second portion 114 is typically different than in the first portion 116 and the third portion 118.
In certain embodiments, the first portion 116 is convex, the second portion 114 is concave, and the third portion 118 is convex. In certain embodiments, the first portion 116 and the third portion 118 have a positive or converging optical power and the second portion 114 has a negative or diverging optical power. The second portion 114 may have curvature or no curvature in a direction extending radially from the first portion 116 to the third portion 118. For example, the second portion 114 may have a positive or negative curvature (e.g., convex or concave) in a direction extending radially from the first portion 116 to the third portion 118. Furthermore, the second portion 114 may form a closed loop and have surface similar to an outer surface of a frustoconical shape.
In certain embodiments, the first portion 116 is within a central region 132 of the lens body 102. The central region 132 can be recessed within the lens body 102. In certain embodiments, the third portion 118 is within an outer region 130 of the lens body 102. In certain embodiments, an outer perimeter of the first portion 116 is surrounded and/or enclosed by an inner perimeter of the second portion 114. In certain embodiments, an outer perimeter of the second portion 114 is surrounded and/or enclosed by an inner perimeter of the third portion 118. In certain embodiments, the maximum thickness of the lens body 102 in the region of the first portion 116 is less than the maximum thickness of the lens body 102 in the region of the second portion 114.
In certain embodiments, a lens body 202 includes a first portion 222, a second portion 220 and a third portion 224 on the anterior surface 212, as illustrated in
In certain embodiments, both an anterior surface 312 and a posterior surface 310 have a first portion 316, 322, a second portion 314, 320 and a third portion 318, 324, as illustrated in
In certain embodiments, the mask is coupled with the second portion, which is concave. For example, the mask can be located adjacent the second portion. In certain embodiments, the mask is attached to the posterior surface, the anterior surface, or the posterior and the anterior surfaces. In certain embodiments, the mask is within the lens body or between the posterior surface and the anterior surface. The radial width or the area of the mask can be about the same as the radial width or the area of the second portion. In certain embodiments, the mask can extend at least partially into the area of the first portion and/or the third portion of the lens body. By extending the mask into the first portion and/or the third portion, the mask can block light that enters at large angles off the optical center axis of the lens body and that may then pass through the second portion.
Illustrated in
The variety of intraocular lenses described herein are designed to suit the vision correction needs of particular patients. For example, for patients with relatively small pupils, dim light may present more of a vision issue than for patients with larger pupils. For smaller pupil patients, a mask with more light transmission and/or a smaller outer diameter will increase the amount of light that reaches the retina and may improve vision in dim light situations. Conversely, for larger pupil patients, less light transmission and/or a larger outer diameter mask may improve low-contrast near vision and block more unfocused light. The masked IOLs described herein give the surgeon flexibility to prescribe the appropriate combination of masked IOL features for particular patients.
Tables I and II illustrate examples of intraocular lens with reduced lens body thicknesses. The column labeled “Reduced” corresponds to an intraocular lens with a second portion (e.g. transition zone), and the column labeled “Original” is corresponds to an intraocular lens without a second portion. The optic diameter is the diameter of the outer-most portion of the lens body with an optical power. The reduction percentage of the center region thickness indicated in Tables I and II can be about proportional to the reduction in the possible rolled up diameter of a reduced thickness IOL. Therefore, the reduction percentage of the center region thickness indicated in Tables I and II can also be about proportional to the reduction in the incision size that can be used during implantation of the IOL in a patient. An IOL is rolled up and inserted into a tube, and the tube is inserted into the incision. The IOL can then be deployed into the intraocular space of the eye. The IOL is often rolled up as tight as possible so that open space (e.g., voids) is minimized in a cross-section of the tube at a location where the implant body has the greatest cross-sectional area that is generally parallel with the optical axis of the implant body. Therefore, the cross-sectional area of the tube is greater than or equal to the greatest cross-sectional area of the implant body that is generally parallel with the optical axis of the implant body. For example, a 36% reduction in the cross sectional area of the implant body could reduce the cross sectional area of the tube by 36% or could reduce the diameter of the tube by about 20%. A minimum incision length is generally one-half of the circumference of the tube. Therefore, a 36% reduction in the cross sectional area of the implant body can result in about 20% reduction in incision length. For example, a 1.8 mm incision could be reduced to about 1.44 mm. A smaller incision is beneficial because it avoids post-operative astigmatism.
The lens body 202 can include one or more materials. In certain embodiments, the lens body 202 includes two or more materials. For example, the first portion 222 and the third portion 224 can include different materials. If the materials selected for the first portion 222 and the third portion 224 have different refractive indexes, the curvature of the first portion 222 and the third portion 224 can be different to obtain a similar optical power (e.g. dioptric power) for both portions.
Generally, the optical power of an intraocular lens is selected for focusing on far objects. A natural lens can deform to change the focal distance for far and near viewing. Conventional artificial intraocular lenses are generally unable to change the focal distance. For example, an eye that is presbyopic or where an artificial intraocular lens has an optical power for farther distance, light rays that enter the eye and pass through the cornea and the natural lens or artificial intraocular lens converge at a point behind or in front of the retina and do not converge at a point on the retina. The light rays strike the retina over a larger area than if the light rays converged at a point on the retina. The patient experiences this as blurred vision, particularly for up-close objects such as when reading. For such conditions, the mask 208 of the intraocular lens 200 can be configured with an aperture such that only a subset of light rays, e.g. a central portion, are transmitted to the retina. The mask 208 with an aperture can improve the depth of focus of a human eye. For example, the aperture can be a pin-hole aperture. The mask 208 blocks a portion of the outer light rays resulting in more focused light rays. The mask 208 can include an annular region surrounding an aperture. The aperture can be substantially centrally located on the mask. For example, the aperture can be located around a central axis of the mask, also referred to as the optical axis of the mask. The aperture of the mask can be circular or any other shape.
The mask 208 can be positioned in a variety of locations in or on the intraocular lens 200. The mask 208 can be through the lens body 202. The mask 208 can be positioned on the anterior or posterior surface of the lens body 202. In certain embodiments, the mask 208 is embedded within the lens body. For example, the mask 208 can be positioned substantially at the midway line between the posterior and anterior surfaces of the lens body 202. In certain embodiments, the mask 208 is positioned between the midway line and the posterior surface of the lens body 202. Certain embodiments include the mask 208 being positioned midway, one-third or two-thirds between the midway line and the posterior surface of the lens body 202. In certain other embodiments, the mask 208 is positioned between the midway line and the anterior surface of the lens body 202. Certain embodiments include the mask 208 being positioned midway, one-third or two-thirds between the midway line and the anterior surface of the lens body 202. If the transition zone is on the anterior surface of the implant body and the mask is positioned to be on or near the surface of the transition zone on the anterior surface, the mask may not extend beyond the transition zone since light even at large angles from the optical axis that hits or passes through the transition zone surface would be blocked by the mask.
In certain embodiments, the mask 208 of an intraocular lens 200 has an aperture wherein the mask blocks a portion of the light to improve viewing near objects, similar to a mask discussed above. Advantageously, the mask 208 can provide as an aperture and can block a portion light that may not converging on the retina 956 and also block light that passes through the second portion 220, creating aberrations, as described above. In certain embodiments, the aperture of the mask 208 has a diameter of about 1 to 2 mm. In certain embodiments, the mask 208 has an outer perimeter with a diameter of about 3 to 5 mm.
In certain embodiments, the third portion 224 of intraocular lens 200 can improve low light vision. As the pupil of the eye enlarges, eventually light rays will enter and pass through the third portion 224 of the intraocular lens 200. As illustrated in
The mask 208 can have different degrees of opacity. For example, the mask 208 can block substantially all of visible light or may block a portion of visible light. The opacity of the mask 208 may also vary in different regions of the mask 208. In certain embodiments, the opacity of the outer edge and/or the inner edge of the mask 208 is less than the central region of the mask 208. The opacity in different regions may transition abruptly or have a gradient transition. Additional examples of opacity transitions can be found in U.S. Pat. Nos. 5,662,706, 5,905,561 and 5,965,330, which are incorporated in their entirety by reference.
A conventional intraocular lens 1000 is illustrated in
Generally, as discussed above, intraocular lenses are implanted into the eye by rolling up an intraocular lens and inserting the rolled up intraocular lens into a tube. One advantage to a thinner lens body is that it the intraocular lens can be more tightly rolled up resulting in being able to use a small tube and a small incision. Another advantage to a thinner lens body is that the intraocular lens can decrease risks associated with implanting in different locations within the eye. For example, an intraocular lens 200 can be implanted within the anterior chamber. An intraocular lens 200 can also be positioned within the posterior chamber so that the first portion 216 of the posterior surface 210 floats above the natural crystalline lens. The potential for contact between the posterior surface 210 of the intraocular lens 200 and the natural crystalline lens will be reduced because the reduced thickness of the intraocular lens 200. For example, the intraocular lens 200 can be coupled with or attached to the ciliary sulcus (sometimes referred to herein as “sulcus-fixated”). An intraocular lens 200 can also be implanted in the capsular bag, as illustrated in
The intraocular lens 200 and/or the lens body 202 can be made from one or more materials. In certain embodiments, the intraocular lens 200 and/or the lens body 202 can comprise polymers (e.g. PMMA, PVDF, polypropylene, polycarbonate, PEEK, polyethylene, acrylic copolymers, polystyrene, PVC, polysulfone), hydrogels, and silicone.
II. Masks Providing Depth of Focus Correction
A variety of variations of masks that can be positioned on or within the implant body 2014 are discussed herein, and also described in U.S. Pat. No. 7,628,810, U.S. Patent Publication No. 2006/0113054, and U.S. Patent Publication No. 2006/0265058 which are hereby incorporated by reference in their entirety.
The mask can have dimensions configured to function with the implant body to improve a patient's vision. For example, the thickness of the mask can vary depending on the location of the mask relative to the implant body. For example, if the mask is embedded within the implant body, the mask can have a thickness greater than zero and less than the thickness of the implant body. Alternatively, if the mask is coupled to a surface of the implant body, the mask may preferably have a thickness no greater than necessary to have desired opacity so that the mask does not add additional thickness to the intraocular lens. In certain embodiments, the mask has a thickness of greater than zero and less than about 0.5 mm. In one embodiment, the mask has a thickness of about 0.25 mm. If the mask is on or near the surface of the transition zone, the mask can have a shape similar or the same as the transition zone.
The mask may have a constant thickness, as discussed below. However, in some embodiments, the thickness of the mask may vary between the inner periphery (near the aperture 2038) and the outer periphery.
The annular region 2036 can be at least partially opaque or can be completely opaque. The degree of opacity of the annular region 2036 prevents at least some or substantially all light from being transmitted through the mask 2032. Opacity of the annular region 2036 may be achieved in any of several different ways.
For example, in one embodiment, the material used to make mask 2034 may be naturally opaque. Alternatively, the material used to make the mask 2034 may be substantially clear, but treated with a dye or other pigmentation agent to render region 2036 substantially or completely opaque. In still another example, the surface of the mask 2034 may be treated physically or chemically (such as by etching) to alter the refractive and transmissive properties of the mask 2034 and make it less transmissive to light.
In still another alternative, the surface of the mask 2034 may be treated with a particulate deposited thereon. For example, the surface of the mask 2034 may be deposited with particulate of titanium, gold or carbon to provide opacity to the surface of the mask 2034. In another alternative, the particulate may be encapsulated within the interior of the mask 2034, as generally shown in
In another embodiment, the mask may be formed from co-extruded rods made of material having different light transmissive properties. The co-extruded rod may then be sliced to provide disks for a plurality of masks, such as those described herein.
Other embodiments employ different ways of controlling the light transmissivity through a mask. For example, the mask may be a gel-filled disk, as shown in
The material of the mask 2034 may be any polymeric material. Where the mask 2034 is applied to the intraocular implant, the material of the mask 2034 should be biocompatible. Where a gel is used, the material is suitable for holding a gel. Examples of suitable materials for the mask 2034 include the preferred polymethylmethacrylate or other suitable polymers or co-polymers, such as hydrogels, and the like. Of course, as indicated above, for non-gel-filled materials, a preferred material may be a fibrous material, such as a Dacron mesh.
Thus, as shown in
Nano-devices or nanites are crystalline structures grown in laboratories. The nanites may be treated such that they are receptive to different stimuli such as light. In accordance with one aspect of certain embodiments, the nanites can be imparted with energy where, in response to a low light and high light environments, they rotate in the manner described above and generally shown in
Nanoscale devices and systems and their fabrication are described in Smith et al., “Nanofabrication,” Physics Today, February 1990, pp. 24-30 and in Craighead, “Nanoelectromechanical Systems,” Science, Nov. 24, 2000, Vol. 290, pp. 1502-1505, both of which are incorporated by reference herein in their entirety. Tailoring the properties of small-sized particles for optical applications is disclosed in Chen et al. “Diffractive Phase Elements Based on Two-Dimensional Artificial Dielectrics,” Optics Letters, Jan. 15, 1995, Vol. 20, No. 2, pp. 121-123, also incorporated by reference herein in its entirety.
In additional embodiments, a photochromic material can be used as the mask or in addition to mask. Under bright light conditions, the photochromic material can darken thereby creating a mask and enhancing near vision. Under dim light conditions, the photochromic lightens, which allows more light to pass through to the retina. In certain embodiments, under dim light conditions, the photochromic lightens to expose an optic of the intraocular implant.
The mask can have different degrees of opacity. For example, the mask can block substantially all of visible light or may block a portion of visible light. The opacity of the mask may also vary in different regions of the mask. In certain embodiments, the opacity of the outer edge and/or the inner edge of the mask is less than the central region of the mask. The opacity in different regions may transition abruptly or have a gradient transition. Additional examples of opacity transitions can be found in U.S. Pat. Nos. 5,662,706, 5,905,561 and 5,965,330, which are incorporated in their entirety by reference.
In some embodiments, the mask 2034 is attached or fixed to the eye 2010 by support strands 2072 and 2074 shown in
Further mask details are disclosed in U.S. Pat. No. 4,976,732, issued Dec. 11, 1990 and in U.S. patent application Ser. No. 10/854,033, filed May 26, 2004, both of which are incorporated by reference herein in their entirety.
An advantage to embodiments that include a mask with an aperture (e.g., pin-hole aperture) described herein over multifocal IOLs, contact lenses, or treatments of the cornea is that all of these latter approaches divide the available light coming through the aperture into two or more foci while a mask approach has a single focus (monofocal). This limitation forces designers of multifocal optics to choose how much of the light is directed to each focal point, and to deal with the effects of the unfocused light that is always present in any image. In order to maximize acuity at the important distances of infinity (>6M) and 40 cm (normal reading distance), it is typical to provide little or no light focused at an intermediate distance, and as a result, visual acuity at these distances is poor.
With an aperture to increase depth-of-focus, however, the intermediate vision of presbyopic patient is improved significantly. Indeed, the defocus blur with the pin-hole aperture is less at intermediate distances than at near. This can be seen in
Visual acuity is measured in log MAR and is the log of the minimum angle of resolution or the smallest angular spacing that can be seen, and it is independent of viewing distance. A log MAR value of 0 means 20/20, 6/6, or a decimal acuity of 1 at distance, and equivalent to a near acuity of Jaeger 1 (J1). Defocus is measured in diopters, which are the reciprocal of the eye's focal length in meters. Thus, −1 D of defocus means the eye is focused at 1/1=1 meter. The standard (US and Europe) reading distance is 40 cm, which is −2.5 D of defocus (1/0.4=2.5).
III. UV-Resistant Polymeric Mask Materials
Because the mask has a very high surface to volume ratio and is exposed to a great deal of sunlight following implantation, the mask preferably comprises a material which has good resistance to degradation, including from exposure to ultraviolet (UV) or other wavelengths of light. Polymers including a UV absorbing component, including those comprising UV absorbing additives or made with UV absorbing monomers (including co-monomers), may be used in forming masks as disclosed herein which are resistant to degradation by UV radiation. Examples of such polymers include, but are not limited to, those described in U.S. Pat. Nos. 4,985,559 and 4,528,311, the disclosures of which are hereby incorporated by reference in their entireties. In a preferred embodiment, the mask comprises a material which itself is resistant to degradation by UV radiation. In one embodiment, the mask comprises a polymeric material which is substantially reflective of or transparent to UV radiation. The lens body may include a UV absorbing component in addition to the mask being resistant to degradation by UV radiation or the mask may not be resistant to degradation by UV radiation since the UV absorbing component in the lens body may prevent degradation of the mask by UV radiation.
Alternatively, the mask may include a component which imparts a degradation resistive effect, or may be provided with a coating, preferably at least on the anterior surface, which imparts degradation resistance. Such components may be included, for example, by blending one or more degradation resistant polymers with one or more other polymers. Such blends may also comprise additives which provide desirable properties, such as UV absorbing materials. In one embodiment, blends preferably comprise a total of about 1-20 wt. %, including about 1-10 wt. %, 5-15 wt. %, and 10-20 wt. % of one or more degradation resistant polymers. In another embodiment, blends preferably comprise a total of about 80-100 wt. %, including about 80-90 wt. %, 85-95 wt. %, and 90-100 wt. % of one or more degradation resistant polymers. In another embodiment, the blend has more equivalent proportions of materials, comprising a total of about 40-60 wt. %, including about 50-60 wt. %, and 40-50 wt. % of one or more degradation resistant polymers. Masks may also include blends of different types of degradation resistant polymers, including those blends comprising one or more generally UV transparent or reflective polymers with one or more polymers incorporating UV absorption additives or monomers. These blends include those having a total of about 1-20 wt. %, including about 1-10 wt. %, 5-15 wt. %, and 10-20 wt. % of one or more generally UV transparent polymers, a total of about 80-100 wt. %, including about 80-90 wt. %, 85-95 wt. %, and 90-100 wt. % of one or more generally UV transparent polymers, and a total of about 40-60 wt. %, including about 50-60 wt. %, and 40-50 wt. % of one or more generally UV transparent polymers. The polymer or polymer blend may be mixed with other materials as discussed below, including, but not limited to, opacification agents, polyanionic compounds and/or wound healing modulator compounds. When mixed with these other materials, the amount of polymer or polymer blend in the material which makes up the mask is preferably about 50%-99% by weight, including about 60%-90% by weight, about 65-85% by weight, about 70-80% by weight, and about 90-99% by weight.
Preferred degradation resistant polymers include halogenated polymers. Preferred halogenated polymers include fluorinated polymers, that is, polymers having at least one carbon-fluorine bond, including highly fluorinated polymers. The term “highly fluorinated” as it is used herein, is a broad term used in its ordinary sense, and includes polymers having at least one carbon-fluorine bond (C—F bond) where the number of C—F bonds equals or exceeds the number of carbon-hydrogen bonds (C—H bonds). Highly fluorinated materials also include perfluorinated or fully fluorinated materials, materials which include other halogen substituents such as chlorine, and materials which include oxygen- or nitrogen-containing functional groups. For polymeric materials, the number of bonds may be counted by referring to the monomer(s) or repeating units which form the polymer, and in the case of a copolymer, by the relative amounts of each monomer (on a molar basis).
Preferred highly fluorinated polymers include, but are not limited to, polytetrafluoroethylene (PFTE or Teflon®), polyvinylidene fluoride (PVDF or Kynar®), poly-1,1,2-trifluoroethylene, and perfluoroalkoxyethylene (PFA). Other highly fluorinated polymers include, but are not limited to, homopolymers and copolymers including one or more of the following monomer units: tetrafluoroethylene —(CF2-CF2)-; vinylidene fluoride —(CF2-CH2)-; 1,1,2-trifluoroethylene —(CF2-CHF)—; hexafluoropropene —(CF(CF3)-CF2)-; vinyl fluoride —(CH2-CHF)— (homopolymer is not “highly fluorinated”); oxygen-containing monomers such as —(O—CF2)-, —(O—CF2-CF2)-, —(O—CF(CF3)-CF2)-; chlorine-containing monomers such as —(CF2-CFCl)—. Other fluorinated polymers, such as fluorinated polyimide and fluorinated acrylates, having sufficient degrees of fluorination are also contemplated as highly fluorinated polymers for use in masks according to preferred embodiments. The homopolymers and copolymers described herein are available commercially and/or methods for their preparation from commercially available materials are widely published and known to those in the polymer arts.
Although highly fluorinated polymers are preferred, polymers having one or more carbon-fluorine bonds but not falling within the definition of “highly fluorinated” polymers as discussed above, may also be used. Such polymers include co-polymers formed from one or more of the monomers in the preceding paragraph with ethylene, vinyl fluoride or other monomer to form a polymeric material having a greater number of C—H bonds than C—F bonds. Other fluorinated polymers, such as fluorinated polyimide, may also be used. Other materials that could be used in some applications, alone or in combination with a fluorinated or a highly fluorinated polymer, are described in U.S. Pat. No. 4,985,559 and in U.S. Pat. No. 4,528,311, both of which are hereby incorporated by reference herein in their entirety.
The preceding definition of highly fluorinated is best illustrated by means of a few examples. One preferred UV-resistant polymeric material is polyvinylidene fluoride (PVDF), having a structure represented by the formula: —(CF2-CH2)n-. Each repeating unit has two C—H bonds, and two C—F bonds. Because the number of C—F bonds equals or exceeds the number of C—H bonds, PVDF homopolymer is a “highly fluorinated” polymer. Another material is a tetrafluoroethylene/vinyl fluoride copolymer formed from these two monomers in a 2:1 molar ratio. Regardless of whether the copolymer formed is block, random or any other arrangement, from the 2:1 tetrafluoroethylene:vinyl fluoride composition one can presume a “repeating unit” comprising two tetrafluoroethylene units, each having four C—F bonds, and one vinyl fluoride unit having three C—H bonds and one C—F bond. The total bonds for two tetrafluoroethylenes and one vinyl fluoride are nine C—F bonds, and three C—H bonds. Because the number of C—F bonds equals or exceeds the number of C—H bonds, this copolymer is considered highly fluorinated.
Certain highly fluorinated polymers, such as PVDF, have one or more desirable characteristics, such as being relatively chemically inert and having a relatively high UV transparency as compared to their non-fluorinated or less highly fluorinated counterpart polymers. Although the applicant does not intend to be bound by theory, it is postulated that the electronegativity of fluorine may be responsible for many of the desirable properties of the materials having relatively large numbers of C—F bonds.
In preferred embodiments, at least a portion of the highly fluorinated polymer material forming the mask comprises an opacification agent which imparts a desired degree of opacity. In one embodiment, the opacification agent provides sufficient opacity to produce the depth of field improvements described herein, e.g., in combination with a transmissive aperture. In one embodiment, the opacification agent renders the material opaque. In another embodiment, the opacification agent prevents transmission of about 90 percent or more of incident light. In another embodiment, the opacification agent renders the material opaque. In another embodiment, the opacification agent prevents transmission of about 80 percent or more of incident light. Preferred opacification agents include, but are not limited to organic dyes and/or pigments, preferably black ones, such as azo dyes, hematoxylin black, and Sudan black; inorganic dyes and/or pigments, including metal oxides such as iron oxide black and ilminite, silicon carbide and carbon (e.g. carbon black, submicron powdered carbon). The foregoing materials may be used alone or in combination with one or more other materials. The opacification agent may be applied to one or more surfaces of the mask on all or some of the surface, or it may be mixed or combined with the polymeric material (e.g. blended during the polymer melt phase). Although any of the foregoing materials may be used, carbon has been found to be especially useful in that it does not fade over time as do many organic dyes, and that it also aids the UV stability of the material by absorbing UV radiation. In one embodiment, carbon may be mixed with polyvinylidene fluoride (PVDF) or other polymer composition comprising highly fluorinated polymer such that the carbon comprises about 2% to about 20% by weight of the resulting composition, including about 10% to about 15% by weight, including about 12%, about 13%, and about 14% by weight of the resulting composition.
Some opacification agents, such as pigments, which are added to blacken, darken or opacify portions of the mask may cause the mask to absorb incident radiation to a greater degree than mask material not including such agents. Because the matrix polymer that carries or includes the pigments may be subject to degradation from the absorbed radiation, it is preferred that the mask, which is thin and has a high surface area making it vulnerable to environmental degradation, be made of a material which is itself resistant to degradation such as from UV radiation, or that it be generally transparent to or non-absorbing of UV radiation. Use of a highly UV resistant and degradation resistant material, such as PVDF, which is highly transparent to UV radiation, allows for greater flexibility in choice of opacification agent because possible damage to the polymer caused by selection of a particular opacification agent is greatly reduced.
A number of variations of the foregoing embodiments of degradation resistant constructions are contemplated. In one variation, a mask is made almost exclusively of a material that is not subject to UV degradation. For example, the mask can be made of a metal, a highly fluorinated polymer, carbon (e.g., graphene, pure carbon), or another similar material. Construction of the mask with metal is discussed in more detail in U.S. application Ser. No. 11/000,562 filed Dec. 1, 2004 and entitled “Method of Making an Ocular Implant” and also in U.S. application Ser. No. 11/107,359 filed Apr. 14, 2005 with the title “Method of Making an Ocular Implant”, both of which are incorporated herein in their entirety by reference. As used in this context, “exclusively” is a broad term that allows for the presence of some non-functional materials (e.g., impurities) and for an opacification agent, as discussed above. In other embodiments, the mask can include a combination of materials. For example, in one variation, the mask is formed primarily of any implantable material and is coated with a UV resistant material. In another variation, the mask includes one or more UV degradation inhibitors and/or one or more UV degradation resistant polymers in sufficient concentration such that the mask under normal use conditions will maintain sufficient functionality in terms of degradation to remain medically effective for at least about 5 years, preferably at least about 10 years, and in certain implementations at least about 20 years.
At step 3000, a liquid form of a polymer is created by dissolving polyvinylidene fluoride (PVDF) pellets into a solvent such as dimethyl acetamide (DMAC or DMA) using heat until the PVDF has completely dissolved. In one embodiment, the solution may be mixed for a minimum of 12 hours to ensure that the PVDF has completely dissolved. At step 3200, the PVDF/DMAC solution is mixed with an opacification agent, such as a dye or carbon black, using a high speed shear mixer. In one embodiment, the carbon black comprises 13% by weight of the resulting composition while the PVDF comprises 87% by weight of the resulting composition. At step 3300, the PVDF/carbon black solution is optionally milled in a high speed mill, for example an Eiger high speed mill, to break up any large carbon agglomerates in the solution. The PVDF/carbon black solution may be run through the mill a second time to further break up any carbon agglomerates. At step 3400, the resulting solution is applied to a silicon wafer to create a polymer film on the silicon disk. Here, approximately 55 g of the PVDF/carbon black solution is poured into a dispensing barrel for application on a silicon wafer. The silicon disk is placed on the spinner of a spin casting machine and the dispensing barrel is used to apply a bead of PVDF/carbon black solution to the silicon wafer in a circular pattern, leaving the center 1″ diameter of the disk empty. The spinner cycle is actuated to disperse the PVDF/carbon black solution over the disk, forming a uniform 10 micron thick film. A polymer film may also be deposited, spray coated, etc. to a silicon wafer. The coated silicon disk is then placed on a hot-plate to evaporate the DMAC. At step 3500, the coated silicon wafer is placed under an excimer laser. A laser cutting mask is mounted in the laser and the laser is actuated. Using the laser cutting mask, approximately 150 mask patterns are laser machined into the PVDF/carbon black film. The mask patterns may also be formed using a punch technique, electron beam, etch, etc. The mask patterns are arranged such that the material extending approximately 5 mm from the edge of the silicon disk is not used. During the laser machining, the silicon disk may be bathed in nitrogen gas in order to cool the surface. At step 3600, the laser machined masks are removed from the silicon disk using a razor blade. An optional step may include placing the laser-machined mask into a forming mold. The mold can be any shape desired, such as a flat mold, a convex mold, a concave mold, or a mold with a more complex shape. The mask may be placed in the bottom half of the forming mold in one technique. The top half of the forming mold can be placed on top of the mask and the molds can be placed in an oven at about 160° C. The molds are then heated and baked to form the masks. The molds are allowed to bake for approximately two hours at approximately 160° C. After two hours the oven temperature is reduced to about 30° C. and the masks are baked for approximately two hours or until the oven temperature has dropped to below around 40° C.
At step 3016, the inlay (e.g. mask) made in the first method 3014 is placed in a mold form. In one embodiment, silicone or other lens material is injected into the mold form and around the inlay. At step 3018, the silicone is cured to form an implant body. At step 3020, the intraocular implant is polished, and at step 3022, the implant body is extracted from the mold form. At step 3024, one or more haptics may be attached (e.g. bonded) to the implant body to form an intraocular implant. Step 3024 may be included for a three piece IOL design, but may not be needed for other designs. In certain embodiments, the one or more haptics are formed with the implant body during the injection process. For example, the implant body may be lathed and the haptics milled from a single piece. The intraocular implant can be subsequently inspected (e.g. cosmetic, diopter, resolution).
IV. Masks Configured to Reduce Visible Diffraction Patterns
Many of the foregoing masks can be used to improve the depth of focus of a patient. Various additional mask embodiments are discussed below. Some of the embodiments described below include light transmission holes through the mask annular region to change the amount of light blocked by the annular region. Light transmission holes through the mask can improve a patient's dim or low light vision. In certain arrangements of light transmission holes, the light transmission holes may generate diffraction patterns that interfere with the vision improving effect of the masks described herein. Accordingly, certain masks are described herein that include light transmission holes that do not generate diffraction patterns or otherwise interfere with the vision enhancing effects of the mask embodiments.
In one embodiment, the mask 2100 includes a body 2104 that has an anterior surface 2108 and a posterior surface 2112. The body 2104 may be formed of any suitable material, including at least one of an open cell foam material, an expanded solid material, and a substantially opaque material. In one embodiment, the material used to form the body 2104 has relatively high water content. In other embodiments, the materials that can be used to form the body 2104 include polymers (e.g. PMMA, PVDF, polypropylene, polycarbonate, PEEK, polyethylene, acrylic copolymers (e.g., hydrophobic or hydrophilic), polystyrene, PVC, polysulfone), hydrogels, silicone, metals, metal alloys, or carbon (e.g., graphene, pure carbon).
In one embodiment, the mask 2100 includes a light transmission hole arrangement 2116. The light transmission hole arrangement 2116 may comprise a plurality of holes 2120. The holes 2120 are shown on only a portion of the mask 2100, but the holes 2120 preferably are located throughout the body 2104 in one embodiment. In one embodiment, the holes 2120 are arranged in a hex pattern, which is illustrated by a plurality of locations 2120′ in
Preferably the mask 2100 is symmetrical, e.g., symmetrical about a mask axis 2136. In one embodiment, the outer periphery 2124 of the mask 2100 is circular. The mask in general has a diameter within the range of from about 3 mm to about 8 mm, often within the range of from about 3.5 mm to about 6 mm, and less than about 6 mm in one embodiment. In another embodiment, the mask is circular and has a diameter in the range of 4 to 6 mm. In another embodiment, the mask 2100 is circular and has a diameter of less than 4 mm. The outer periphery 2124 has a diameter of about 3.8 mm in another embodiment. In some embodiments, masks that are asymmetrical or that are not symmetrical about a mask axis provide benefits, such as enabling a mask to be located or maintained in a selected position with respect to the anatomy of the eye.
The body 2104 of the mask 2100 may be configured to be coupled with a particular intraocular lens design, either of reduced thickness design or of conventional design. For example, where the mask 2100 is to be coupled with a particular IOL that has curvature, the body 2104 may be provided with a corresponding amount of curvature along the mask axis 2136 that corresponds to the curvature. Likewise, the body 2104 may be provided with corresponding shape to accommodate IOL transition zones.
In some embodiments, the mask 2100 has a desired amount of optical power. Optical power may be provided by configuring the at least one of the anterior and posterior surfaces 2108, 2112 with curvature. In one embodiment, the anterior and posterior surfaces 2108, 2112 are provided with different amounts of curvature. In this embodiment, the mask 2100 has varying thickness from the outer periphery 2124 to the aperture 2128.
In one embodiment, one of the anterior surface 2108 and the posterior surface 2112 of the body 2104 is substantially planar. In one planar embodiment, very little or no uniform curvature can be measured across the planar surface. In another embodiment, both of the anterior and posterior surfaces 2108, 2112 are substantially planar. In general, the thickness of the body 2104 of the mask 2100 may be within the range of from greater than zero to about 0.5 mm. In another embodiment, the thickness 2138 of the mask 2100 is about 0.25 mm. [0201] A substantially planar mask has several advantages over a non-planar mask. For example, a substantially planar mask can be fabricated more easily than one that has to be formed to a particular curvature. In particular, the process steps involved in inducing curvature in the mask 2100 can be eliminated.
The aperture 2128 is configured to transmit substantially all incident light along the mask axis 2136. The non-transmissive portion 2132 surrounds at least a portion of the aperture 2128 and substantially prevents transmission of incident light thereon. As discussed in connection with the above masks, the aperture 2128 may be a through-hole in the body 2104 or a substantially light transmissive (e.g., transparent) portion thereof. The aperture 2128 of the mask 2100 generally is defined within the outer periphery 2124 of the mask 2100. The aperture 2128 may take any of suitable configurations, such as those described above.
In one embodiment, the aperture 2128 is substantially circular and is substantially centered in the mask 2100. The size of the aperture 2128 may be any size that is effective to increase the depth of focus of an eye of a patient suffering from presbyopia. In particular, the size of the aperture 2128 is dependent on the location of the mask within the eye (e.g., distance from the retina). For example, in the intraocular space of the eye, the aperture 2128 can be circular, having a diameter of less than about 2 mm in one embodiment. In another embodiment, the diameter of the aperture is between about 1.1 mm and about 1.6 mm. In another embodiment, the aperture 2128 is circular and has a diameter of about 1.6 mm or less. In a further embodiment, the diameter of the aperture is about mm. Most apertures will have a diameter within the range of from about 0.85 mm to about 2.2 mm, and often within the range of from about 1.1 mm to about 1.7 mm.
In certain embodiments, the aperture 2128 includes an optical power and/or refractive properties. For example, the aperture 2128 can include an optic and can have an optical power (e.g. positive or negative optical power). In certain embodiments, the aperture 2128 can correct for refractive errors of an eye.
The non-transmissive portion 2132 is configured to prevent transmission of radiant energy through the mask 2100. For example, in one embodiment, the non-transmissive portion 2132 prevents transmission of substantially all of at least a portion of the spectrum of the incident radiant energy. In one embodiment, the non-transmissive portion 2132 is configured to prevent transmission of substantially all visible light, e.g., radiant energy in the electromagnetic spectrum that is visible to the human eye. The non-transmissive portion 2132 may substantially prevent transmission of radiant energy outside the range visible to humans in some embodiments.
As discussed above, preventing transmission of light through the non-transmissive portion 2132 decreases the amount of light that reaches the retina and the fovea that would not converge at the retina and fovea to form a sharp image. As discussed above, the size of the aperture 2128 is such that the light transmitted therethrough generally converges at the retina or fovea. Accordingly, a much sharper image is presented to the eye than would otherwise be the case without the mask 2100.
In one embodiment, the non-transmissive portion 2132 prevents transmission of at least about 90 percent of incident light. In another embodiment, the non-transmissive portion 2132 prevents transmission of at least about 95 percent of all incident light. The non-transmissive portion 2132 of the mask 2100 may be configured to be substantially opaque to prevent the transmission of light. As used herein the term “opaque” is intended to indicate a transmission of no more than about 2% of incident visible light. In one embodiment, at least a portion of the body 2104 is configured to be opaque to more than 99 percent of the light incident thereon.
As discussed above, the non-transmissive portion 2132 may be configured to prevent transmission of light without absorbing the incident light. For example, the mask 2100 could be made reflective or could be made to interact with the light in a more complex manner, as discussed in U.S. Pat. No. 6,554,424, issued Apr. 29, 2003, which is hereby incorporated by reference herein in its entirety.
As discussed above, the mask 2100 also has light transmission holes that in some embodiments comprises the plurality of holes 2120. The presence of the plurality of holes 2120 (or other light transmission structures) may affect the transmission of light through the non-transmissive portion 2132 by potentially allowing more light to pass through the mask 2100. In one embodiment, the non-transmissive portion 2132 is configured to absorb about 98 percent or more of the incident light from passing through the mask 2100 without holes 2120 being present. The presence of the plurality of holes 2120 allows more light to pass through the non-transmissive portion 2132 such that only about 95 percent of the light incident on the non-transmissive portion 2132 is prevented from passing through the non-transmissive portion 2132. The holes 2120 may reduce the benefit of the aperture 2128 on the depth of focus of the eye by allowing more light to pass through the non-transmissive portion to the retina.
As discussed above, the holes 2120 of the mask 2100 shown in
The holes 2120 of
In one embodiment, the holes 2120 have a diameter in the range of about 0.002 mm to about 0.050 mm. In certain embodiments, the holes 2120 have a diameter of about 0.005 mm or more. In another embodiment, the holes have a diameter of about 0.020 mm. In another embodiment, the holes have a diameter of about 0.025 mm. In another embodiment, the holes have a diameter of about 0.027 mm. In another embodiment, the holes 2120 have a diameter in the range of about 0.020 mm to about 0.029 mm. In one embodiment, the number of holes in the plurality of holes 2120 is selected such that the sum of the surface areas of the hole entrances 2140 of all the holes 2100 comprises about 5 percent or more of surface area of the anterior surface 2108 of the mask 2100. In another embodiment, the number of holes 2120 is selected such that the sum of the surface areas of the hole exits 2164 of all the holes 2120 comprises about 5 percent or more of surface area of the posterior surface 2112 of the mask 2100. In another embodiment, the number of holes 2120 is selected such that the sum of the surface areas of the hole exits 2164 of all the holes 2120 comprises about 5 percent or more of surface area of the posterior surface 2112 of the mask 2112 and the sum of the surface areas of the hole entrances 2140 of all the holes 2120 comprises about 5 percent or more of surface area of the anterior surface 2108 of the mask 2100. In another embodiment, the plurality of holes 2120 may comprise about 1600 microperforations. In another embodiment, the plurality of holes 2120 comprises about 8400 microperforations.
Each of the holes 2120 may have a relatively constant cross-sectional area. In one embodiment, the cross-sectional shape of each of the holes 2120 is substantially circular. Each of the holes 2120 may comprise a cylinder extending between the anterior surface 2108 and the posterior surface 2112.
The relative position of the holes 2120 is of interest in some embodiments. As discussed above, the holes 2120 of the mask 2100 are hex-packed, e.g., arranged in a hex pattern. In particular, in this embodiment, each of the holes 2120 is separated from the adjacent holes 2120 by a substantially constant distance, sometimes referred to herein as a hole pitch. In one embodiment, the hole pitch is about 0.045 mm.
In a hex pattern, the angles between lines of symmetry are approximately 43 degrees. The spacing between any two neighboring holes is generally within the range of from about 30 microns to about 100 microns, and, in one embodiment, is approximately 43 microns. The hole diameter is generally within the range of from about 2 microns to about 100 microns, and in one embodiment, is approximately 20 microns. The light transmission is a function of the sum of hole areas as will be understood by those of skill in the art in view of the disclosure herein.
Negative visual effects may arise due to the presence of the light transmission hole arrangement 2116. For example, in some cases, a hex packed arrangement of the holes 2120 can generate diffraction patterns visible to the patient. For example, patients might observe a plurality of spots, e.g., six spots, surrounding a central light with holes 2120 having a hex patterned.
A variety of techniques are possible that produce advantageous arrangements of light transmission holes such that diffraction patterns and other deleterious visual effects do not substantially inhibit other visual benefits of a mask. In one embodiment, where diffraction effects would be observable, the light transmission holes are arranged to spread the diffracted light out uniformly across the image to eliminate observable spots. In another embodiment, the light transmission holes employ a pattern that substantially eliminates diffraction patterns or pushes the patterns to the periphery of the image.
Other embodiments may be provided that vary at least one aspect, including one or more of the foregoing aspects, of a plurality of holes to reduce the tendency of the holes to produce visible diffraction patterns or patterns that otherwise reduce the vision improvement that may be provided by a mask with an aperture, such as any of those described above. For example, in one embodiment, the hole size, shape, and orientation of at least a substantial number of the holes may be varied randomly or may be otherwise non-uniform. The mask may also be characterized in that at least one of the hole size, shape, orientation, and spacing of a plurality of holes is varied to reduce the tendency of the holes to produce visible diffraction patterns. In certain embodiments, the tendency of the holes to produce visible diffraction patterns is reduced by having a plurality of the holes having a first hole size, shape, or spacing and at least another plurality of the holes with a second hole size, shape, or spacing different from the first hole size, shape, or spacing. In other embodiments, the mask is characterized in that at least one of the hole size, shape, orientation, and spacing of a substantial number of the plurality of holes is different than at least one of the hole size, shape, orientation, and spacing of at least another substantial number of the plurality of holes to reduce the tendency of the holes to produce visible diffraction patterns. In further embodiments, the holes are positioned at irregular locations. For example, the holes are positioned at irregular locations to minimize the generation of visible artifacts due to the transmission of light through the holes.
The outer peripheral region 2305 may extend from an outer periphery 2324 of the mask 2300 to a selected outer circumference 2325 of the mask 2300. The selected outer circumference 2325 of the mask 2300 is located a selected radial distance from the outer periphery 2324 of the mask 2300. In one embodiment, the selected outer circumference 2325 of the mask 2300 is located about 0.05 mm from the outer periphery 2324 of the mask 2300.
The inner peripheral region 2306 may extend from an inner location, e.g., an inner periphery 2326 adjacent an aperture 2328 of the mask 2300 to a selected inner circumference 2327 of the mask 2300. The selected inner circumference 2327 of the mask 2300 is located a selected radial distance from the inner periphery 2326 of the mask 2300. In one embodiment, the selected inner circumference 2327 of the mask 2300 is located about 0.05 mm from the inner periphery 2326.
The mask 2300 may be the product of a process that involves random selection of a plurality of locations and formation of holes on the mask 2300 corresponding to the locations. As discussed further below, the method can also involve determining whether the selected locations satisfy one or more criteria. For example, one criterion prohibits all, at least a majority, or at least a substantial portion of the holes from being formed at locations that correspond to the inner or outer peripheral regions 2305, 2306. Another criterion prohibits all, at least a majority, or at least a substantial portion of the holes from being formed too close to each other. For example, such a criterion could be used to assure that a wall thickness, e.g., the shortest distance between adjacent holes, is not less than a predetermined amount. In one embodiment, the wall thickness is prevented from being less than about 20 microns.
In a variation of the embodiment of
In any of the foregoing mask embodiments, the body of the mask may be formed of a material selected to substantially prevent negative optic effects, such as diffraction, as discussed above. In various embodiments, the masks are formed of an open cell foam material, silicone, thermoset and thermoeleastic polymers such as PVDF, PMMA, metal, Teflon, or carbon. In another embodiment, the masks are formed of an expanded solid material.
As discussed above in connection with
In a first step of one technique, a plurality of locations 2220′ is generated. The locations 2220′ are a series of coordinates that may comprise a non-uniform pattern or a regular pattern. The locations 2220′ may be randomly generated or may be related by a mathematical relationship (e.g., separated by a fixed spacing or by an amount that can be mathematically defined). In one embodiment, the locations are selected to be separated by a constant pitch or spacing and may be hex packed.
In a second step, a subset of the locations among the plurality of locations 2220′ is modified to maintain a performance characteristic of the mask. The performance characteristic may be any performance characteristic of the mask. For example, the performance characteristic may relate to the structural integrity of the mask. Where the plurality of locations 2220′ is selected at random, the process of modifying the subset of locations may make the resulting pattern of holes in the mask a “pseudo-random” pattern.
Where a hex packed pattern of locations (such as the locations 2120′ of
In certain embodiments, an outer peripheral region is defined that extends between the outer periphery of the mask and a selected radial distance of about 0.05 mm from the outer periphery. In another embodiment, an inner peripheral region is defined that extends between an aperture of the mask and a selected radial distance of about 0.05 mm from the aperture. In another embodiment, an outer peripheral region is defined that extends between the outer periphery of the mask and a selected radial distance and an inner peripheral region is defined that extends between the aperture of the mask and a selected radial distance from the aperture. In one technique, the subset of location is modified by excluding those locations that would correspond to holes formed in the inner peripheral region or the outer peripheral region. By excluding locations in at least one of the outer peripheral region and the inner peripheral region, the strength of the mask in these regions is increased. Several benefits are provided by stronger inner and outer peripheral regions. For example, the mask may be easier to handle during manufacturing or when being rolled without causing damage to the mask. In other embodiments, the mask does not include an outer peripheral region and/or inner peripheral region that do not have holes (e.g., holes may extend to the inner periphery and/or the outer periphery).
In another embodiment, the subset of locations is modified by comparing the separation of the holes with minimum and or maximum limits. For example, it may be desirable to assure that no two locations are closer than a minimum value. In some embodiments this is important to assure that the wall thickness, which corresponds to the separation between adjacent holes, is no less than a minimum amount. As discussed above, the minimum value of separation is about 20 microns in one embodiment, thereby providing a wall thickness of no less than about 20 microns.
In another embodiment, the subset of locations is modified and/or the pattern of location is augmented to maintain an optical characteristic of the mask. For example, the optical characteristic may be opacity and the subset of locations may be modified to maintain the opacity of a non-transmissive portion of a mask. In another embodiment, the subset of locations may be modified by equalizing the density of holes in a first region of the body compared with the density of holes in a second region of the body. For example, the locations corresponding to the first and second regions of the non-transmissive portion of the mask may be identified. In one embodiment, the first region and the second region are arcuate regions (e.g., wedges) of substantially equal area. A first areal density of locations (e.g., locations per square inch) is calculated for the locations corresponding to the first region and a second areal density of locations is calculated for the locations corresponding to the second region. In one embodiment, at least one location is added to either the first or the second region based on the comparison of the first and second areal densities. In another embodiment, at least one location is removed based on the comparison of the first and second areal densities.
In a third step, a hole is formed in a body of a mask at locations corresponding to the pattern of locations as modified, augmented, or modified and augmented. The holes are configured to allow at least some light transmission through the mask without producing visible diffraction patterns.
V. Additional Mask Configurations
A mask can have a variety of other configurations including configurations that include features described above. For example, the density of light transmission holes (e.g. area of holes per area of mask) can be different in different areas of the mask. In certain embodiments, the density of holes increases radially out from the inner periphery to the outer periphery of the mask. In certain other embodiments, the density of holes decreases radially out from the inner periphery to the outer periphery of the mask. Other variations are also possible. For example, a center annular region of the mask 4000 can have a higher density of holes than an inner annular region and an outer annular region, as illustrated in
The embodiment of the mask 4000 illustrated in
The transition of the density of holes between the center annular region to the inner and/or outer annular regions can be a gradual radial transition or can be a transition with one or more steps. The change in the density of holes from one region to another can be done by having the number of holes remain constant while the hole size is varied, by having the hole size remain constant while the number of holes is varied, or a combination of varying the number of holes and the hole size. Additional details regarding transition of the density of holes between the center annular region to the inner and/or outer annular regions are described in the concurrently filed international patent application, the entirety of which is hereby incorporated by reference, titled “CORNEAL INLAY WITH NUTRIENT TRANSPORT STRUCTURES,” International Patent Application No. PCT/US2010/045541 filed the same day as the present application, which claims the benefit of U.S. Provisional Application No. 61/233,802, by Bruce Christie, Edward W. Peterson, and Corina van de Pol.
Advantageously, by having at least some light transmission through the mask, patient dim light vision can be improved over having substantially no light transmission through the mask. Embodiments include total area density of holes of the mask of greater than 1%, less than 10%, between 1% and 10%, between 2% and 5%. Embodiments include light transmittance through the mask of greater than 1%, less than 10%, between 1% and 10%, between 2% and 5%. In certain embodiments, the center annular region of the mask has an average light transmittance of between 2% and 5% and the inner annular region and the outer annular region have an average light transmittance of between 1 and 2%. In certain embodiments, the inner annular region is the annular region between the inner periphery of the mask to about one-third the radial distance from the inner periphery to the outer periphery of the mask. In certain embodiments, the outer annular region is the annular region between the outer periphery of the mask to about one-third the radial distance from the outer periphery to the inner periphery of the mask. In certain embodiments, the center annular region is the annular region between the inner annular region and the outer annular region.
Advantageously, if the mask is in a position between the posterior and anterior surfaces of a lens body, the holes through the mask can help to prevent delamination of the interface between the mask and the lens body. Delamination can occur during manipulation of the intraocular implant such as when the intraocular implant is folded or rolled and placed into a tube to be implanted into the patient. The lens body can extend through the holes, thereby creating a bond (e.g. material “bridge”) between the lens body on either side of the mask. Delamination can also be reduced by matching mechanical properties (e.g. elastic modulus) of the mask to the lens body. Another method to reduce delamination is to create a bond between the lens body and the mask. For example, the lens body and the mask can have cross-linking bonds or van der Waals forces between them.
The holes in the mask serve at least two purposes: the holes provide some light transmission and the holes create areas where the material of the implant body can extend through to create a material “bridge” that holds the mask in place. In certain embodiments, the mask includes holes greater than about 7 microns in diameter (e.g., greater than a cross-sectional area of about 35 μm2), and preferably greater than about 10 microns in diameter (e.g., greater than a cross-sectional area of about 75 μm2). In certain embodiments, the mask includes holes greater than about 7 microns in diameter (e.g., greater than a cross-sectional area of about 35 μm2) and less than about 20 microns in diameter (e.g., less than a cross-sectional area of about 320 μm2). In further embodiments, the mask includes holes less than about 50 microns in diameter (e.g., less than a cross-sectional area of about 2000 μm2·Holes with diameters less than 7 microns may not be large enough for lens material such as silicone or acrylic to enter and migrate to form a bridge. Although, the viscosity of the lens material will affect whether the material will be able to migrate into the hole to form the bridge and a minimum cross-sectional area of the hole may be dependent on the material of the implant body. If the material of the implant body does not migrate into a hole, that hole may create a bubble that could interfere with the visual performance of the implant.
The total amount of light that passes through the mask can be desirable to be minimized to maximize near image contrast. Delamination can be prevented with a relatively small total area of the mask having holes for “bridges”. For example, an area of about 3% of the mask can include holes which can balance maximizing mechanical strength and minimizing optical effects of the holes. In certain embodiments, the anterior surface of the mask has a mask surface area, and the light transmission structures (e.g., holes) in the mask have a total area on the anterior surface of the mask of about 1% to about 5% of the mask surface area. To limit the impact of diffraction of light passing through the holes of the mask, the holes can be made as small as possible. The Airy disc from each hole is larger the smaller the hole size, so the composite diffraction pattern produced by the pattern of holes becomes larger as well. The composite diffraction pattern spreads light over a larger portion of the retina, decreasing the local brightness of diffracted light and making diffraction artifacts less visible. Diffraction patterns produced by a pattern of holes also tends to have a chromatic component such that the diffraction halo tends to graduate in color radially. Varying the size of the holes produces this effect in multiple scales, which scrambles the color of the halo. This reduces color contrast in the halo, making it less noticeable.
In a certain embodiment, the mask includes randomly or pseudo-randomly placed holes across the mask. The mask 4100 illustrated in
The outer diameter of the outer periphery of the mask can be varied. In certain embodiments, the outer diameter is selected to selectively allow an amount of light to pass to the retina of the eye. The pupil of the eye changes size in different lighting condition. In low light situations, the pupil of the eye enlarges to let more light into the eye. The outer diameter can be selected so that light does not pass outside the outer periphery of the mask in relatively high light conditions, and so that at least some light can pass outside the outer periphery of the mask in relatively low light conditions. The pupil size of patients often can vary; therefore, the outer diameter of the mask can be selected for a specific patient pupil size. For example, for patients with relatively small pupils, dim light may present more of a vision issue than for patients with larger pupils. For smaller pupil patients, a mask with more light transmission and/or a smaller outer diameter will increase light reaching the retina and improve vision in dim light situations. Conversely, for larger pupil patients, less light transmission and/or a larger outer diameter mask may improve low-contrast near vision and block more unfocused light. The masked IOLs of the present application give the surgeon flexibility to prescribe the appropriate combination of masked IOL features for particular patients.
In certain embodiments, the center of the aperture of the mask is off-center to the center of the lens body. By having an aperture off-center to the optical center of the lens body, the intraocular lens can be rotated during the implantation procedure so that the optical center of the patient's eye can be aligned with the center of the aperture. The vision of the patient can be improved by aligning the optical center of the patient's eye with the aperture center.
VI. Methods of Making Ocular Implants
Intraocular implants (e.g., intraocular lenses) can be made or produced in a number of different ways. In certain embodiments, a rod can be formed with an optically transparent inner region along a length of the rod, an optically transparent outer region along the length of the rod and a substantially optically non-transparent middle region along the length of the rod between the inner region and the outer region. Cross-sectional sections along a plane substantially perpendicular to an axis parallel to the length of the rod can be sectioned out to form an implant body (e.g., lens body) with a mask through the implant body. In certain embodiments, a rod can be formed by forming an optically transparent rod. An opaque cylinder can be formed around the optically transparent rod. An optically transparent cylinder can then be formed around the opaque cylinder. In certain embodiments, the cylinders are formed by casting or molding.
In alternative embodiments, an implant body can be formed and then a mask can be attached to the posterior surface and/or anterior surface of the implant body. For example, the mask can be adhered with adhesive (e.g. glued), mechanically attached, snapped on, welded (e.g. tack welding, area welding), taped, press fit, thermal or hydration swell fit, held by surface tension, electric charge, magnetic attraction, polymerization, in-situ cross-linking (e.g. cross-linked by radiation), chemical means, etc.
In certain embodiments, the implant body includes a structure to allow a mask to securely attach thereto. For example, the implant body can include clips or other structures to physically attach the mask. The implant body can include a recessed portion on the posterior or anterior surface. A mask that substantially fills the recessed portion can be placed in the recessed portion of the implant body. The inner periphery and/or the outer periphery of the recessed portion can include one or more protrusions. The inner periphery and/or the outer periphery can include one or more recesses. The mask can be attached to the implant body by inserting the mask into the recessed portion and the one or more protrusions can enter the one or more recesses to prevent the mask from separating from the implant body. In certain embodiments, the mask is attached to the implant body after the intraocular implant has been inserted into the patient. In other embodiments, the mask is attached to the implant body before the implant body has been inserted into the patient. For example, the mask can be attached to the implant body in a factory or in an operating room.
In further embodiments, an implant body can be formed around a mask. For example, an implant body can be injected molded around a mask.
In certain embodiments, the intraocular implant includes one or more support members that extend from the mask to an outer surface of the implant body to aid in manufacturing intraocular implants with masks. The support members can suspend the mask in a mold cavity in desired alignment in relation to the mold cavity. A contact portion of the support member can physically contact a wall of the mold cavity to support the mask. For example, the support members can be removably coupled to mold to keep the mask stationary while the implant body is injected around the mask but can be removed after the implant body has been formed. The support member can be mechanically coupled to the mask, or the support member and mask can be a single piece (e.g., monolithic structure).
The support structures may also include tabs that can be removed after the implant body has been formed around the mask.
The support structure 6702 can include more mass near the outer periphery of the implant body 6708 where the support structure 6702 would less likely interfere with the patient's vision. For example, the support structure 6702 can have an annulus or ring near the outer periphery of the implant body 6708 that provides additional support and further restricts movement of the mask 6704 and portions of the support structure 6702 during molding process when material flows around the mask. The flow of material can produce forces on the mask 6704 and support structure 6702. In certain embodiments, the implant body 6708 and the haptics 6716 are a single piece (e.g., monolithic structure).
As illustrated in
The support members may be integrated with the haptic of intraocular implant. The haptic and support member may be coupled together or can be a single piece (e.g., monolithic structure). In certain embodiments, the mask, support member, and haptic are all coupled together. For example, the mask, support member, and haptic can be a single piece (e.g., monolithic structure). The mask, support member, and/or haptic may comprise the same material. Furthermore, the mask, support member, and/or haptic may comprise the same material of the implant body; however, the mask, support member, and/or haptic may include or incorporate a dye or other pigment to create opacity. Alternatively, the mask, support member, and/or haptic may comprise different materials than the implant body, but be materials that are compatible with the material of the implant body.
In certain embodiments, the mask is printed onto an implant body. The mask can be printed on the posterior and/or the anterior surface of the implant body. The printed mask can either be adjacent the surface of the implant body or can penetrate into the implant body (stain, tattoo, etc.). Printing options can include offset printing, block printing, jet printing, etc. The mask can also be applied to the implant body by thermal transfer or hot stamping. The mask may also be laser etched onto the surface or within the implant body such as with a sub-surface laser engraving. The printed mask can be bonded or adhered to the implant body. In certain embodiments, the mask is printed onto the implant body after the implant body has been inserted into the patient. In other embodiments, the mask is printed onto the implant body before the implant body has been inserted into the patient. For example, the mask can be printed onto the implant body in a factory or in an operating room.
In certain embodiments, a mask is formed in or on the implant body by selectively making the material of the implant body opaque or reflective. For example, materials such as black silicone, carbon-powdered Teflon, PVDF with carbon, etc. can be used. Additional examples of materials that the mask can include are described in U.S. Patent Publication No. 2006/0265058. The implant body can be a material that changes from transparent to opaque (e.g., a photochromic material) or reflective upon being exposed to certain conditions. The molecular structure of the implant body material can be changed optically, chemically, electrically, etc. For example, structure of the implant body can be changed to create voids, regions of altered index, surface facets, etc. In certain embodiments, a dye in or on the implant body can be activated with light or electricity to change from being transparent to opaque or reflective. In certain embodiments, the mask is formed after the implant body has been inserted into the patient. In other embodiments, the mask is formed before the implant body has been inserted into the patient. For example, the mask can be formed in a factory or in an operating room.
In certain embodiments, the implant body has posterior and/or anterior surfaces with contours to create an optical power. The contours of the surfaces of the implant body can also be formed by a number of methods. For example, the implant body can be molded into a shape. In another example, the surfaces of the implant body can be milled to form the contours.
Haptics can be formed with the implant body or can be subsequently attached to the implant body. For example, haptics can be cast or molded onto the implant body in a single-piece configuration. In addition, haptics can be mechanically attached to the implant body. For example, holes can be drilled into the implant body and haptics can be inserted. Haptics can also be attached by using an adhesive or glue. In certain embodiments, the intraocular implant does not have an implant body. If the intraocular implant does not have an implant body, the haptics can be attached to the mask.
There are also a number of methods of positioning and adjusting the mask within a mold cavity of a mold. For example, a single mold can be used while the position of a mask within the mold cavity can be adjusted to accurately position mask relative to the mold cavity and eventually the implant body.
The positioning sensors 9010 can be used to measure the position of the mask within the mold cavity. For example, a Hal Effect sensor can detect magnetic fields, and the sensor's output voltage can vary in response to changes in a magnetic field. With a fixed magnetic field, the distance to the source of the field can be accurately calculated. Diamagnetic levitation and induction levitation are options that can be used with a magnetic mask. Cameras, ultrasonic detectors, capacitive proximity sensors, and laser interferometry can also be used to measure the position of the mask.
A number of types of mask positioning apparatuses 9020 and methods can be used to move and position the mask within the mold cavity. For example, wires, such as nanowires, can be coupled to the mask and a frame such as a frame that surrounds the mask.
Diamagnetic levitation can also be used to position the mask. A diamagnetic substance is one whose atoms have no permanent magnetic dipole moment. When an external magnetic field is applied to a diamagnetic substance a weak magnetic dipole moment is induced in the direction opposite the applied field. Pyrolytic graphite is strongly diamagnetic, and pyrolytic graphite has a specific gravity around 2.1, so it is easily levitated. Diamagnetic levitation occurs by bringing a diamagnetic material in close proximity to material that produces a magnetic field. The diamagnetic material will repel the material producing the magnetic field. Most substances that are not magnetic are weakly diamagnetic. The repulsive force may not be strong enough to overcome the force of gravity. To cause diamagnetic levitation, both the diamagnetic material and magnetic material produce a combined repulsive force to overcome the force of gravity. The magnetic field can be from a permanent magnet or can be from an electromagnet. The mask 9202 can be a diamagnetic material that can be levitated with a magnetic field 9204, as illustrated in
A mask may also be levitated by using sonic levitation. Acoustic radiation pressure can produce intense sound wave in the liquid polymer to move the mask. Electrostatic levitation can also be used by applying an electrostatic field to the mask to counterbalance gravity. High voltage electrodes 9402 can be oriented around the mask 9404, as illustrated in
The mask may be formed by a bistable display (e.g., Cholesteric Liquid Crystal Display (ChLCD)) that is capable of maintaining a state (e.g., opaque or transparent) without electrical power.
VII. Intraocular Implants with Haptics
Anterior chamber intraocular lens have generally been made from polymethyl methacrylate (PMMA), which is a relatively hard thermoplastic. A certain amount of rigidity was believed necessary to maintain stability of the implant in the anterior chamber. For example, a stiffening element can be added to the haptic to achieve the desirable stability of the intraocular lens (see, e.g., U.S. Pat. No. 6,228,115 (Hoffmann, et al.)). However, the compressive forces of PMMA intraocular lenses is far in excess of what is required for stability. It is also possible to construct intraocular lenses from soft materials such as silicones, hydrogels and soft acrylics. With these softer materials, there is some question as to the stability of the implant in the anterior chamber; however, intraocular implants made from soft material are stable when certain compressive forces and contact areas are used.
For example, the commercially available Bausch & Lomb NuVita Model MA 20 exhibits a force response of approximately 2.7 mN at 1 mm of compression when measured according to the industry standard compression test, ISO/DIS 11979-3. The intraocular implant illustrated in
As illustrated in
In certain embodiments, the intraocular implant 5010 includes a mask 5020 embedded in or carried by a single piece comprising a soft acrylic, such as those described in U.S. Pat. Nos. 5,290,892, 5,403,901, 5,433,746, 5,674,960, 5,861,031 and 5,693,095, the disclosures of which are hereby incorporated by reference in their entirety. Such a material allows the intraocular implant 5010 to be rolled or folded so as to fit through a 3.5 mm or less surgical incision and implanted in the anterior chamber of an eye. The intraocular implant 5010 may also be made from a soft silicone or hydrogel material. In certain embodiments, the intraocular implant 5010 includes two opposing pairs of footplates 5012 joined to the implant body 5014 by haptics 5016 and ramps 5018. The implant body 5014 may have any suitable diameter, but is preferably between 5.0 mm and 6.0 mm. The footplates 5012 are separated by the haptic 5016 by a distance S, that is preferably less than 1.5 times the diameter of implant body 5014, and most preferably around 1.3 times the diameter of implant body 5014. The footplates 5012 and haptics 5016 preferably are between 0.20 and 0.30 mm thick, which provides sufficient compressive force, while minimizing axial vaulting of intraocular implant 5010 to less than 1.5 mm and preferably less than 1.0 mm when the footplates 5012 and haptics 5016 are compressed 1 mm. As discussed above, the compressive force of the haptics 5016 and footplates 5012 can be sufficient for the stability of intraocular implant 5010, but not so large to cause irritation or pupil ovaling. Preferably, the intraocular implant 5010 exhibits a force response of approximately less than 0.5 mN, and more preferably, approximately less than 0.3 mN, when the intraocular implant 5010 is compressed 1 mm according to industry standard test ISO/DIS 11979-3.
The mask 5020 has an aperture 5022 to improve the depth of focus of a human eye. In certain embodiments, the aperture 5022 is a pin-hole aperture. The mask 5020 can extend through the entire anterior-posterior dimension of the implant body 5014, as illustrated in
The implant of
The mask 5021, 5023 can be positioned on, neighboring, near or adjacent the anterior or posterior surface of the implant body 5011, 5013, as illustrated in
VIII. Intraocular Implants with Masks
Intraocular implants for improving the vision of a patient, such as by increasing the depth of focus of an eye of a patient, can include different types of structures.
The intraocular implant 6000 may include one or more haptics 6004 to prevent the intraocular implant 6000 from moving or rotating within the eye. The haptics 6004 can be a variety of shapes and sizes depending on the location the intraocular implant 6000 is implanted in the eye. For example, the haptics 6004 illustrated in
As illustrated in
In certain embodiments, at least a portion of the implant body is opaque. As used herein the term “opaque” is intended to indicate a transmission of no more than about 2% of incident visible light. In one embodiment, at least a portion of the implant body 6002 is configured to be opaque to more than 99% of the light incident thereon. In certain embodiments, at least a portion of the mask 6006 is opaque. In certain other embodiments, at least a portion of the mask 6006 is configured to transmit between 2 and 5% of incident visible light. In certain embodiments, the mask 6006 transmits no more than 95% of incident visible light. In certain embodiments, the intraocular implant 6000 is a single integrated opaque piece.
The size of the aperture 6008 may be any size that is effective to increase the depth of focus of an eye of a patient suffering from presbyopia. For example, the aperture 6008 can be circular. In one embodiment, the aperture 6008 has a diameter of less than about 2 mm. In another embodiment, the diameter of the aperture is between about 1.6 mm and about 2.0 mm. In another embodiment, the aperture 6008 has a diameter of about 1.6 mm or less. In another embodiment, the diameter of the aperture is about 1.4 mm. In certain embodiments, the diameter of the aperture is between about 0.85 mm to about 2.2 mm. In further embodiments, the diameter of the aperture is between about 1.1 mm to about 1.7 mm.
In certain embodiments, the outer hole region 6010 of intraocular implant s 6000 can improve low light vision. As the pupil of the eye enlarges, eventually light rays will enter and pass through the outer hole region 6010 of the intraocular implant 6000. If the pupil of the eye is large enough so that light rays pass through outer hole region 6010 of the intraocular implant 6000, additional light rays will strike the retina.
The outer hole region 6010 can be a variety of shapes and sizes.
Intraocular implants 6000 can have any number of connection portions 6016. Embodiments include intraocular implants with at least one connection portion, at least two connection portions, at least three connection portions, at least four connection portions, at least five connection portions, at least six connection portions, less than ten connection portions, less than six connection portions, between one and ten connection portions.
Similarly, intraocular implants 6000 can have any number of outer holes 6014. Embodiments include intraocular implants with at least one outer hole, with at least two outer holes, with at least three outer holes, with at least four outer holes, at least five outer holes, at least six outer holes, less than ten outer holes, less than six outer region holes, between one and ten outer region holes.
In certain embodiments, the cross-sectional area perpendicular to the length of an outer hole of at least one outer hole is at least about 1 mm2. In certain embodiments, the cross-sectional area perpendicular to the length of the outer holes of at least two outer holes is at least about 1 mm2 for each of the at least two outer holes. In certain embodiments, area on the implant body of the outer hole region is at least about 5 mm2 or at least about 10 mm2.
The distance between the outer perimeter 6018 of the aperture 6008 (e.g. inner perimeter 6018 of the mask 6006) and outer perimeter 6020 of the mask 6006 can also vary. For example, the distance between the outer perimeter 6018 of the aperture 6008 and outer perimeter 6020 of the mask 6006 can be adjusted depending on the particular patient and the location within the eye that the intraocular implant 6000 is positioned. Embodiments include the distance between the outer perimeter 6018 of the aperture 6008 and outer perimeter 6020 of the mask 6006 to be about 1.1 mm, between about 0.8 and about 1.4 mm, between about 0.4 and about 2.5 mm, greater than zero, greater than about 0.4 mm, and greater than about 0.8 mm.
In certain embodiments, the aperture 6008 and/or the outer hole region 6010 includes an optical power and/or refractive properties. For example, the aperture 6008 and/or the outer hole region 6010 can include an optic and can have an optical power (e.g. positive or negative optical power). In certain embodiments, the aperture 6008 and/or the outer hole region 6010 can correct for refractive errors of an eye.
The distance between the inner perimeter 6020 of the outer hole region 6010 (e.g. outer perimeter 6020 of the mask 6006) and the outer perimeter 6022 of the outer hole region 6010 can be a variety of sizes. Embodiments include the distance between the inner perimeter 6020 of the outer hole region 6010 and the outer perimeter 6022 of the outer hole region 6010 to be about 0.85 mm, greater than about 0.7 mm, greater than about 0.4 mm, greater than zero, between about 0.6 and about 1.0 mm, and between about 0.2 and about 1.5 mm.
In certain embodiments, the outer hole region 6010 has a incident visible light transmission of at least 90% or at least 95%. In certain embodiments, the outer hole region 6010 area includes at least 90% or at least 95% outer holes 6014. In certain embodiments, the outer hole region 6010 area includes no more than 10% or no more than 5% connection portions 6016.
The outer hole region 6010 can have irregular annular shapes.
In certain embodiments, connection portions 6016 extend substantially radially out from the center of the implant body 6002, as illustrated in
In certain embodiments, the outer hole region 6010 is substantially annularly circle-shaped, as illustrated in
In certain embodiments, the outer hole region 6010 can be a substantially continuous annulus, as illustrated in
In certain embodiments, the aperture 6008 is substantially centered in the mask 6006, as illustrated in
The intraocular implant 6000 can be a variety of thicknesses (e.g. distance between the posterior and anterior surfaces). For example, the thickness of the intraocular implant 6000 can be about 0.2 mm, less than about 0.5 mm, less than about 0.3 mm, or less than about 0.2 mm.
The outer holes 6014 can be open holes or can be filled with a substantially transparent material. For example, the outer holes 6014 can be formed in the implant body 6002, and a substantially transparent material can used to fill the outer holes 6014.
The mask 6006 of the intraocular implant 6000 can be any of the variations described above. In certain embodiments, the mask 6006 includes light transmission holes. For example, the configuration of the mask 4000 illustrated in
Various embodiments have been described above. Although the invention has been described with reference to these specific embodiments, the descriptions are intended to be illustrative and are not intended to be limiting. Various modifications and applications may occur to those skilled in the art without departing from the true spirit and scope of the invention as defined in the appended claims.
This application claims the benefit of U.S. Provisional Application Nos. 61/233,794, filed Aug. 13, 2009, and 61/233,804, filed Aug. 13, 2009, the entirety of each of which is hereby incorporated by reference.
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| Number | Date | Country | |
|---|---|---|---|
| 20110040376 A1 | Feb 2011 | US |
| Number | Date | Country | |
|---|---|---|---|
| 61233794 | Aug 2009 | US | |
| 61233804 | Aug 2009 | US |
