Patent Application
20230354974
Over the years, it has been a common perception that it would be ideal to provide users of contact lenses with a “single touch” case - that is, a case whereby the wearer of contact lenses can take the lens from the lens storage case with a single touch of one of his or her fingers, and then, with this single touch, position the lens correctly on the eye. In such a design, there would be no need for transfer and manipulation of the lens from one finger to another (as is currently common) before placing the lens on the eye. Providing such a single touch case would not only streamline the lens preparation and insertion process; it would also diminish the possibility of dropping the lens or exposing the lens to additional bacteria on a user’s other fingers as the lens is being prepared for orientation and insertion onto the eye, and also reduces the possibility of touching the side of the lens which is intended to contact the eye.
Design of a single touch lens case faces some distinct challenges. The user ideally should be able to consistently position the lens to adhere to the finger during removal from the case, and then the lens needs to consistently release from the finger onto the eye. Contact lenses (of both the reusable and daily disposable variety) each have their own unique surface, bulk and geometric properties. Finger size and the force a contact lens wearer imparts on the lens during transfer can also vary. These factors can impact the process for taking the lens from the case onto the finger and then onto surface of the eye. Among other considerations: it would be desirable for users to be able to drain away any lens solution which might impact the ability of adhering the lens to the finger, as variation in the amount of lens solution adhering to the lens and case can impact the process of placing the lens on the finger. Also, the wearer may be concerned about the potential of transferring bacteria or external products such as make up to the contact lens; and of course, manufacture of the case itself should conform to expected industry standards recognized by the medical and commercial provider communities.
Further, the single touch case ideally should not result in an inordinate increase in the cost of goods over current contact lens cases, as this could result in increased costs to the user community. The case should not make it difficult to hold the lens when removed from the case. Additionally, if the configuration of the case were to maintain, or even reduce the volume of solution needed to case the lens, this would reduce the ecological impact of the lens case. Similarly, it would be beneficial if all or part of the case could be made of recycled materials, and/or recyclable in whole or part.
In addition, it would be advantageous if the case were composed of materials that are already approved by the various regulatory bodies and ideally did not require a change in solution chemistry or lens composition. Optimally, as well, the functionality of the case preferably does not incorporate any electronics or other electrical components, if such components could adversely affect performance of either the case or the lens.
There are several desirable attributes that have made achieving the function of a single touch case challenging and that are often lacking in known attempts to create a single touch case. These attributes include, for example, the following:
US7,398,877, WO2014/195588, WO2009/069265, JP6339322 disclose cases which present the lens in a convex, bowl down configuration. However, the lens support structures substantially match the shape of the contact lens, which provides undesirable contact area between the lens and lens support. These references are also silent as to mechanisms for effective solution drainage from the lens and lens support.
US20190046353 discloses contact lens storage containers that facilitates an increased ease of lens removal. However, the case requires the user to pour out the lens solution and has curved support ribs that do not provide the desired consistent one touch removal.
US20200229560 discloses cases with lens supports that support the concave (anterior or front) surface of the contact lens, or grates that support the contact lens peripheral edge and allows lens solution to drain through a grate to a bottom chamber upon opening the lens case.
Thus, there remains a need for contact lens cases which provide a consistent one touch lens removal experience.
The cases of the present invention provide improved functionality during storage, drainage, lens transfer and reusability that enable consistent one touch transfer of the lens from the lens case to the wearer’s finger. The one touch feature includes the following features individually and in combination:
The lens is fully submerged in the lens solution during storage, and the lid and base form a water tight seal when fully closed. To prevent optical distortions the lens support and lid interior may be designed so that the lens optic zone does not permanently rest on any feature/structure to prevent distortion.
The lens support is designed to maintain the lens in the desired convex orientation, but minimize contact between the lens and lens support to provide good drainage, such that the lens solution is clear of the lens upon opening, without fluid bridging to the lens or pooling around areas of contact between the lens and support. Because the case is reusable, it is desirable it should be easy to use. It should be easy for the lens wearer to place the lens in the case, fill the case with the correct level of solution to ensure lens submersion, and to open, close, clean, drain and dry the case.
The lens case structures and features in the case may also be designed to minimize microbial build-up.
The present invention relates to a contact lens case comprising
The present invention further relates to a contact lens case comprising
The present invention further relates to a contact lens case comprising
The present invention will be better understood from the appended drawings, in which:
The present invention relates to cases for contact lenses, such as hydrogel contact lenses that permit the user to remove the contact lens from the case with the touch of a fingertip at or near the apex of the contact lens. The lens once transferred to the fingertip is in a position suitable for placement by the wearer on the eye, thereby simplifying lens removal from the case and insertion on the eye.
As used herein, the following terms have the foregoing meaning.
A benefit of the lens cases of the present invention is that they provide consistent one-touch lens transfer from the case to a wearer’s finger, and then from the finger to the wearer’s eye without the lens inverting, falling off the finger or further manipulation. Consistent lens transfer includes a transfer rate of at least about 70%, at least about 80% or at least about 90% transfer on the first touch of the finger (or “dab”). The lens also desirably “sits up” on the finger without collapsing or inverting and then transfers to the eye when placed there. Cases of the present invention may provide the desired one-touch transfer across a range of finger sizes, and dab pressures. Environmental conditions such as the temperature and whether the finger is wet or dry may also impact transfer rate, with higher temperatures generally improving lens transfer. Lens transfers evaluated in the present invention were conducted at room temperature.
Contact lenses refers to ophthalmic devices that reside on the eye. They have a generally hemispheric shape and can provide optical correction, cosmetic enhancement, UV blocking and visible light or glare reduction, therapeutic effect, including wound healing, delivery of drugs or neutraceuticals, diagnostic evaluation or monitoring, or any combination thereof. The term lens includes soft hydrogel contact lenses, which are generally provided to the consumer in a case in the hydrated state, and have a relatively low moduli, which allows them to conform to the cornea. Contact lenses suitable for use with the cases of the present invention include all hydrated contact lenses, including conventional and silicone hydrogel contact lenses.
A hydrogel is a hydrated crosslinked polymeric system that contains water in an equilibrium state, and may contain at least about 25%, or at least 35% water in the hydrated state. Hydrogels typically are oxygen permeable and biocompatible, making them excellent materials for producing contact lenses.
Conventional hydrogel contact lenses do not contain silicone containing components, and generally have higher water content, lower oxygen permeability, moduli and shape memories than silicone hydrogels. Conventional hydrogels are prepared from monomeric mixtures predominantly containing hydrophilic monomers, such as 2-hydroxyethyl methacrylate (“HEMA”), N-vinyl pyrrolidone (“NVP”) or polyvinyl alcohols. U.S. Pat. Nos. 4,495,313, 4,889,664 and 5,039,459 disclose the formation of conventional hydrogels. Conventional hydrogels may be ionic or non-ionic and include polymacon, etafilcon, nelfilcon, ocufilcon lenefilcon and the like. The oxygen permeability of these conventional hydrogel materials is typically below 20-30 barrers.
Silicon hydrogel formulations include balafilcon samfilcon, lotrafilcon A and B, delfilcon, galyfilcon, senofilcon A, B and C, narafilcon, comfilcon, formofilcon, riofilcon, fanfilcon, stenfilcon, somofilcon, kalifilcon and the like. “Silicone hydrogels” refer to polymeric networks made from at least one hydrophilic component and at least one silicone-containing component. Silicone hydrogels may have moduli in the range of 60-200, 60-150 or 80 -130 psi, water contents in the range of 20 to 60%. Examples of silicone hydrogels include acquafilcon, asmofilcon, balafilcon, comfilcon, delefilcon, enfilcon, fanfilcon, formofilcon, galyfilcon, lotrafilcon, narafilcon, riofilcon, samfilcon, senofilcon, somofilcon, and stenfilcon, including all of their variants, as well as silicone hydrogels as prepared in U.S. Pat. Nos. 4,659,782, 4,659,783, 5,244,981, 5,314,960, 5,331,067, 5,371,147, 5,998,498, 6,087,415, 5,760,100, 5,776,999, 5,789,461, 5,849,811, 5,965,631, 6,367,929, 6,822,016, 6,867,245, 6,943,203, 7,247,692, 7,249,848, 7,553,880, 7,666,921, 7,786,185, 7,956,131, 8,022,158, 8,273,802, 8,399,538, 8,470,906, 8,450,387, 8,487,058, 8,507,577, 8,637,621, 8,703,891, 8,937,110, 8,937,111, 8,940,812, 9,056,878, 9,057,821, 9,125,808, 9,140,825, 9156,934, 9,170,349, 9,244,196, 9,244,197, 9,260,544, 9,297,928, 9,297,929 as well as WO 03/22321, WO 2008/061992, and US 2010/0048847. These patents are hereby incorporated by reference in their entireties. Silicon hydrogels may have higher shape memory than conventional contact lenses.
Hydrogel lenses are viscoelastic materials. Contact lenses can form optical distortions if the lens interacts with either the case or any air bubble in the case. The extent of the optical distortions, and the length of time needed for the distortions to relax out will vary depending on the chemistry, and to a lesser extent, geometry of the lens. Conventional lens materials, such as polyhydroxyethyl methacrylate-based lenses like etafilcon A or polymacon have low loss modulus and tan delta compared to silicone hydrogels, and may form fewer and less severe optical distortions as a result of contact with packaging. The incorporation of silicones (which generally increase the bulk elastic response), wetting agents such as PVP (which generally increase the viscous response) or coatings such as plasma coatings or conventional hydrogel materials (which may lower the elastic response at the lens interface) can alter the lens viscoelastic properties. Conventional hydrogel contact lenses and silicone hydrogel contact lenses having short or stiff crosslinking agents and or stiffening agent have short shape memories and may be less susceptible to deformation during storage. As used herein, high or higher shape memory hydrogels display optical distortions from contact with an air bubble or case of at least about 0.18 after 5 weeks of accelerated aging at 55° C. Viscoelastic properties, including loss modulus and tan delta, can be measured using a dynamic mechanical analysis.
The contact lenses can be of any geometry or power, and have a generally hemispherical shape, with a concave posterior side which rests against the eye when in use and a convex anterior side which faces away from the eye and is contacted by the eyelid during blinking.
The center of the lens is the center of the lens optic zone. The optic zone provides optical correction and may have a diameter between about 7 and about 10 mm. The lens optic zone provides visual correction. The lens periphery or lens edge is the edge where the anterior and posterior sides meet. The wetted lens is the contact lens and any residual solution attached to it after lens solution drainage. Wetted contact is the aggregated contact area between the wetted lens and lens support.
The contact lens case comprises a lens support surrounded by a reversible sealable chamber. The chamber may have any convenient form and may comprise a base which may have one or multiple compartments or base segments, lens support and at least one lid, each of which are described in detail below. As used herein, the phrases “the lid”, “a lid”, “the base” and “a base” encompass both the singular and plural. The lid and case base are sealed to each other to form a watertight cavity which holds the contact lens, support and lens solution in during cleaning and storage. Tile contact lens case is made from materials which are compatible with the contact lens and solution, as well as biologically inert.
Lens cleaning or multipurpose solution (“lens solution”) is any physiological solution compatible with the selected lens material and case. Lens solutions include buffered solutions having a physiological pH, such as buffered saline solutions. The lens solution may contain known components, including buffers, pH and tonicity adjusting agents, lubricants, wetting agents, nutraceuticals, pharmaceuticals, in case coating components and the like.
The case base forms the bottom of the case. It can be made from any material suitable for packaging medical devices, including plastic. The bottom of the lens support is disposed on and supported by the base surface facing into the case cavity. The lens support may also be integral with the base. The lens support may rest on the inner surface of the case base which may be horizontal or may be angled to maintain the lens support and lens in an angled position when the bottom of the base is horizontal. When the base is disposed at an angle, the angle is preferably at least about 15°, at least about 20°, about 20° to about 80°, about 20° to about 60° or about 20° to about 40° relative to level.
The lid forms the uppermost structure of the case and seals with the base to form a cavity containing the lens support, lens, lens solution and any other incorporated features. The lid may be made from any material suitable for packaging medical devices, including a flat or molded sheet of foil or plastic, laminate films, or plastic. Cases comprising plastic for one structure and foil or laminated films as the other, or cases comprising plastic for the lid and base are known in the art and are examples of suitable combinations.
The lens support keeps the lens in the desired convex orientation (bowl down relative to the base) and position (centered over the support) during storage. The lens support is designed to provide an open structure under the lens bowl to allow, upon opening, the lens solution to drain from the lens and support without trapping water between the support; and a sufficient number of contact points with the lens to prevent the lens from collapsing onto, rotating off or translating across the support. This allows the apex of the lens to be supported by the lens’ own elastic stiffness, or to minimize sinking of the lens apex while limiting the contact area between the support and lens. Too much contact between the support and the lens after solution draining, and water trapped between the support and the lens, can create surface tension between the lens and water on and around the lens support that is greater than the surface tension between a wearer’s finger and the lens, interfering with efficient lens transfer. The sum of the contact between the lens and the lens support when the case is open, and the solution drained from the lens and lens support is the total contact area, which may be less than about 20 mm2, less than 18 mm2 or less than 15 mm2 and is distributed at least around the lens periphery, as described herein.
For lenses made from polymers with longer shape memory, the lens support may be designed to limit contact between the lens and support during storage. Such contact may be distributed around the lens peripheral edge. Contact between the lens optic zone, lens support and lid interior (including any air entry guides) may be transitory or there may be no contact between the optic zone and support, lid or air entry guides. Lenses, such as conventional hydrogels, having shorter shape memory, are less prone to distortion from packaging contact, and can have the contact points distributed around the periphery and throughout the lens profile, including the lens center zone (about 9 mm, or about 5 mm diameter).
The lens supports of the present invention allow, upon dabbing, both the fingertip and lens to deform to match each other’s shape, without causing lens inversion or damage to lens during removal from too much pressure during dabbing. Thus, an aspect of the removal of the lens from the present cases is to control the ratio of the contact area between the finger and lens as compared to the area between the lens and the lens support so that the contact area between the finger and lens exceeds the contact surface area of the lens support on the lens underside. This will ensure that surface tension between finger and lens exceeds surface tension between lens and lens support. Thus, the lens will adhere to the finger for lens transfer and placement onto the eye.
The lens support provides at least 2, at least 3, at least 3, 3 to 14, 4 to 14, 3 to 8 or 4 to 8, 4 to 6 or 6 points of contact with the contact lens edge along the peripheral supports 105. When two peripheral supports are used, they may be wider to provide stability, without exceeding the area of contact desired for consistent lens transfer. The peripheral points of contact prevent the lens from rotating off the lens and can be distributed in a number of configurations, as long as the space between the furthest adjacent contacts is less than the diameter of tile lens. For three contact points, the contacts may be arranged in an acute triangle as shown in Example 16. All (
The peripheral supports 105 provide a path for lens solution to drain from the lens when the case is opened. To facilitate drainage of the lens solution, the peripheral supports are generally transverse to the lens edge, which helps prevent the lens from wrapping around the support, linear and may extend outward to a distance at least 1 mm beyond the contact lens peripheral edge. If the distal ends of the peripheral supports extend less than 2 mm beyond the lens edge, lens solution may be undesirably trapped under the lens, potentially interfering with effective lens transfer. If the central peripheral ends (such as the “V” notches of the peripheral support 105 in
The peripheral supports 105 may be radially disposed around the center of the support. They may attach to each other as shown in
The distal end of adjacent peripheral supports 105 may connect to each other via terminal crosspieces which form a partial peripheral ring 109, as shown in
When a full or partial peripheral ring is included it may have a diameter at least 4 mm larger than the contact lens (at least 2 mm from all contact lens edges) to facilitate drainage of the lens solution away from the lens and lens support. For partial peripheral rings with complex shapes, such as the partial peripheral ring of
The peripheral ring, when included, may rest on the base during storage, may be fixedly attach to the base, or may attach to vertical supports 147 such as feet, stilts 110 as shown in
The case base may also be designed such that the peripheral supports 105 (shown as part of a raised fin in the example embodiment of
The lens support may further comprise at least one positioning structure (not shown) to prevent the lens from translating horizontally across the lens support, particularly for supports disposed at an angle in the case or upon opening and removal. These positioning structures include be notches, prongs or stops along the peripheral support outside the lens periphery, an open central support (described below), positioning pins or tabs inside the lens near the periphery of the lens, where the lens surface is more steeply angled, such as located outside the central zone of the lens (diameter of about 5 mm, about 6 mm, or about 7 mm), or a combination thereof.
As shown in
The top of the central support may have a diameter of about 1 mm to about 10 mm, about 3 mm to about 9 mm, about 5 to about 9 mm, or about 6 about 9 mm. For central supports having flat top regions with diameters less than about 5 mm, additional positioning structures may be desirable. The central support top may be oriented parallel to the lens periphery to form a column as shown in
The central support may be formed from a plurality of arms. The arms may form a flat top section 101, and be supported by one or more columns 108 extending up from the base, as shown in
As shown in
The flat top section may also comprise an optional central fillet 106a centered in the flat top section as shown in
Upon opening the contact lens periphery will rest on the peripheral supports 105 and the lens may additionally rest on the central support or part of the central support, such as the shoulder transitions 102. The side sections 103 may have any shape that provides minimal contact, and preferably no contact with the contact lens upon packaging opening and drainage, such that upon lens transfer the desired contact area differential is achieved. The side sections may be straight (non-curved), as is shown in
The height of the flat top section (when included) is measured from the point of contact between the lens and peripheral supports to the top of the shoulder and can vary depending on the saggital depth and curvature of the contact lens. For effective transfer at least about 0.5 mm, about 0.5 to about 2 mm, 0.5 to about 1.5 mm, or about 0.8 to about 1 mm of deflection from the undeformed contact lens apex may be desirable. For a contact lens having a saggital depth of 3.8 mm, flat top portions having a height of about 2 mm to about 3.3 mm, about 2.5- 3.3 mm, or about 3 to about 3.5 mm may be used. Column heights which are less than about 2 mm can trap lens solution in the support base and encourage the lens to deform and buckle in the center. These heights, whether measured from the apex of the lens to the top of the flat top, if present, or from the base, will provide the desired contact area between the finger and the lens to provide consistent lens transfer, without inverting the lens.
Removing the central column and leaving a void in the center can also provide the desired lens transfer, particularly with lenses with a neutral shape after drainage. The void can have a diameter between about 5 mm and the diameter of the lens (which provides a support with only peripheral supports as in
Any structure below the void preferably has a low surface area so as not to interfere with lens solution drainage. For example, for a void extending to the base of the lens, at least about 50% of the area of the void at base would be clear. Voids which extend below the base of the lens may have structures with greater surface area, so long as those structures do not project above the base.
The length of the arms may also vary, depending on where and to what the arm attaches in the flat top region and whether the arm has a peripheral support. Arms that attach to a center support, such as shown in
The sides sections may be perpendicular relative to the base, or may have any angle 103a (
The angle 103b at the elbow transition between the side section and the peripheral support (when connected to the arm) may be between about 60° and about 120°, or about 80° and about 100°.
The number and shape of the arms may also be varied, so long as they provide the desired balance of efficient drainage of the lens solution upon opening, and contact area with the lens. The cases of tile present invention may have one or more, three to eight, or three to six arms forming the central support, which may be designed to provide the desired contact area between the lens and finger, and resistance along the flat top against the finger touch, but only transitory contact with the contact lens at the optional side sections and shoulder transitions. The shoulder transitions may be disposed radially around the center of the support. The shoulder transitions can be spaced at roughly equal angles from the center. The arms may be planar as is shown in
Each arm has a cross section sufficient to provide a lens support having resistance to prevent lens collapse during drainage, or excessive contact between the lens and lens support during lens transfer. The lens support is preferably formed from rigid materials, and the resistance of the arms may be controlled by the modulus of the lens support material selected and the dimensions of the arm. Rigid plastics which are suitable for injection molding small parts, such as polypropylene homopolymers and copolymers, cyclic olefin polymers (COPs), cyclic olefin copolymers (COCs), and mixtures thereof are suitable materials. Depending on the additive packages included polypropylene homo- and copolymers generally have flexural modulii in the range of 1100-1800 MPa, COPs and COCs have flexural modulii in the range of 1800-2900 MPa, and blends of polypropylene and COPs or COCs may have flexural modulii in the range of 1100-2900 MPa. The polypropylene may be nucleated, controlled rheology or both, and both Ziegler-Natta and metallocene catalyzed polypropylenes may be used. Polypropylene polymers may also include additives including processing aids such as glycerol monostearate, zinc stearates and calcium stearates, fillers which can modify the properties of polypropylene and the like. An example of a suitable polypropylene for use in lens cases in Boremed HF840, which is a polypropylene homopolymer with a slip agent, a melt flow index of 19 g/10 min and a flexural modulus of 1,250 MPa.
References throughout this description to conventional injection molding processes and the use of materials conventionally applied to injection molding should be understood as exemplary. Those of skill in the art will appreciate that other means of manufacture are possible within the scope of the appended claims, including but not limited to alternative molding processes, thermoforming, 3D printing, and the like.
The width of the arms can vary between the limits of the selected molding process and widths necessary for efficient lens solution drainage upon opening.
Suitable arm widths include about 0.5 to about 1.5 mm, about 0.5 to about 1, or about 0.5 to about 0.7 mm, and it will be appreciated that lens support designs having fewer contact points may have thicker arms.
The height of the arms may vary from the limit of the injection molding process to the height of the arm from the base, in which case, the arm is a fin, as is shown in
Suitable materials for the lens support must also non-leaching, compatible with a variety of lens cleaning and care solutions, suitable for use with biomedical devices and inexpensive. Preferably the materials are also recyclable. The lens support materials can, but do not have to be, optically transparent. The lens support materials may be non-polar to encourage drainage of the lens solution. Non-polar materials are those that have a contact angle of greater than 90° via the sessile drop method using deionized water at 25° C.
As can be seen, the lens support of the present invention can have a range of arm and peripheral support configurations and features and are not limited by the specific combinations shown in the Figures and discussed herein.
Additional combinations of arm configurations will be apparent to those of skill in the art with reference to the teachings of the present application. The only limits on the design of the arms are the ability to mold the lens support, and the number and orientation of contact points to balance lens support with the desired drainage upon opening.
The cases of the present invention may have additional features which with the lens support allow the lens solution to be drained from the lens and lens support. The additional drainage features provide a drainage path for lens solution. The drainage path creates, upon opening, an angled fluid film that forms between two solid members, such as adjacent peripheral supports, a generally vertical fluid film that forms between two solid members, such as a central column and a side section, or a steep or generally vertical path along a smooth solid surface, such as a side section or peripheral column wall. The shallower the angle of the drainage path, the easier it is to break the flow path and encourage the formation of lens solution trapped between the lens and lens support, including reservoirs and residual films. Angled drainage paths having an angle between 10° and about 90° are suitable. Lens support and drainage features with sharp edges and very long routes can also break the drainage path.
Integrally angled, elevated or elevated and angled lens supports, as described above and shown in
The upper limit for the length of the drainage channel is defined by the final size of the packaging and if included, the lifting structure.
Referring to
The drainage channel members 115 may be straight as shown in
Other drain channel configurations not illustrated or those that combine aspects of the exemplary configurations depicted are possible and within the scope of the appended claims as will be apparent to those skilled in the art in view of the balance of this disclosure. Furthermore, in some embodiments, a drain channel may be omitted entirely. For example, when the lens support is fixedly angled relative to the bottom of the base, such as in
The case of the present invention may also comprise a lifting structure for lifting the lens support from the lens solution. The lifting structure may present the lens support and lens from the base and lens solution by any suitable means including tilting the lens support up, tilting the base down, raising the lens support up from the base, lowering the base down, or any combination thereof, and the like.
The drainage channel, in cooperation with other features of the case may function as the lifting member, or the lifting member may include structures such as springs, hinges, levers, pivot arms, folds, mechanical traps, handles and combinations thereof. The lifting member may comprise a rigid elongated member extending outward from a structure disposed along the bottom of the lens support, which may form part of the drainage channel. For example, lens supports having elongated drainage channels 215, may include a flexible attachment 245 between the lens support 236 and lid 235 and is located opposite from the lid opening tab 228, such as is shown in
The lifting member may also include an articulating or flexible strip or ring between the lid and lens support, or a folding arm connecting the base and lens support with a flexible attachment between the lid and lens support opposite the folding arm as shown in
Any means for attaching the lifting member to the lid, base or lens support may be used including, an adhesive, glue, any suitable weld, including, but not limited to heat, ultrasonic or laser welding, or a mechanical trap. The lifting member may also be molded as part of the lid.
Additional lifting mechanisms include a simple loop, tab or handle could replace hinge 245 as the lifting mechanism. The user could open the lid and raise the lens support from the solution by lifting on the tab or handle.
Other hinge and lever configurations are known in the art, such as those disclosed in US20140027462, DE4415003 and JP6339322. Alternatively, the lens support side sections may be deformable, replaced with a spring structure, or a spring 237 may be included under the peripheral supports or peripheral ring as shown in
Any deformable structures incorporated under the peripheral supports should be designed not to detract from any drainage features included in the lens (including peripheral supports and rings).
It will be appreciated that lifting mechanisms which raise the lens parallel to the base may not need a separate drainage channel.
The lens solution may also be drained from the lens by removing at least one displacement member from the cavity of the lens case or by opening a separate seal near the bottom of the cavity, or may be poured from the cavity. The displacement member may be molded into the base or the lid structure, and when the case is closed, displaces lens solution in the base cavity, raising the solution level and submerging the lens support and lens. When the displacement member 430 is molded into the base as shown in
The base itself may also be a displacement member such as when the lens and solution are loaded into the lid in the “upside down” configuration such as in
The lens support may be disposed parallel to the bottom of the base as shown in
When displacement members are included, a fill line may also be included in the base cavity to ensure the correct volume of solution is added by the lens wearer to fill the case cavity.
The base may also comprise a reservoir 419 for capturing the lens solution when the lens is raised from the base. The reservoir may be anywhere in the base including around the lens support, as shown in
Any combination of materials may be used for the base, so long as they meet the described performance requirements.
The case of the present invention further comprises a lid. In conventional contact lens cases the contact lens sits in a molded plastic base, having a bowl to receive the contact lens in a concave, bowl up position. As described herein, the cases of the present invention store the lens in a convex position and present the lens, free of lens solution, for one touch transfer to the finger of a wearer.
The lid releasably seals to the case to form a watertight seal by any suitable means, including but not limited to a screw or snap closure.
In addition to sealing the case, the lid may also be designed to control the flow of air into the case upon opening. It is desired that the contact lens remain on the lens support upon opening, instead of sticking to the lid. To achieve this air entering the case upon opening may be directed to travel over the top of the lens first. For cases with two or more lid sections, the topmost lid may be the last to close and the first to open
To exclude air when closing the case, the seal line of the cavity is at or near the highest point in the interior of the cavity. The seal line may be designed to ensure the lens is fully submerged upon closing the lens case. Upon opening, air enters the cavity above the lens or the lid may have a space to channel entering air above the lens. For lens cases having multiple opening tabs, such as the lens cases illustrated in
Two features have been found to be beneficial in directing the air over the lens upon opening: air entry guides along the inner lid surface and an air entry scoop at the designed point of opening, such as inside a seal line. Cases of the present invention may include, one, both or neither of these features.
The air entry guides provide space for the air to travel above the lens, without getting trapped or diverted and may also cooperate with the lens support to prevent the lens from lifting or sliding off the support structure until some air has entered the case above the lens. The contact area between the air entry guides and the lens is preferably low, less than about 50 mm2 or less than about 30 mm2.
The air entry guides may be molded into the lid, either on the inside surface of the lid or as a projection from the lid or may be a separate structure disposed between the lens and the lid when the case is sealed. Upon opening the case, the air entry guides direct air entering the case along designed path over the top of the lens, ensuring the lens remains on the lens support in the desired convex orientation. The air entry guides are disposed along the direction the case lid travels upon opening the case. The air entry guides may have any orientation other than perpendicular to the path of desired air flow. When the case is designed to be opened from the front, the air entry guides are preferably disposed from the front of the case to the back and the intentionally designed path is over the lens from the case front to back.
Suitable air entry guides may include prongs 321 projecting from the lid around the periphery of the lens as is shown in
The air entry guides may also be in the form of continuous or discontinuous (broken) ribs. The ribs can be attached to the inside surface of the molded lid (
The ribs may also extend away from the lens, forming recesses(s) 337 projecting up from the lid surface as shown in
The ribs may have straight walls, may be wedge shaped as in 3G, may comprise an arc, or may have one straight wall and one angled or arc shaped wall. The angled or arc shaped wall may slope along the curvature of the contact lens.
The rib height may be the same from the front of rib to the back (outer ribs in
The ribs may have a height of at least about 2 mm, which may extend from the interior of the lid toward the contact lens or may extend away from the contact lens and define a separate air entry channel. Rib heights may be at least about 2 mm at the highest points, such as those at 522 (the air entry guides outside the optic zone) and 0 to about 0.5 mm at the lowest points, such as those the back of the rib in
When straight ribs are used with shorter profile in the center rib 322a (
In addition to minimizing the height profile of the portion of any ribs 322a which traverse the optic zone of the contact lens, adjacent ribs 322b may be curved outside the optic zone. When curved ribs are included, the diameter of the curved rib region may be up to 11 mm or between about 7 to about 11 mm or about 8 to about 11 mm.
When the ribs are part of a separate molded plastic frame, it may comprise cross supports on the back side of the ribs. However, the height of the ribs should ideally maintain at least about 2 mm of clearance between the lens and cross supports to provide the desired airflow. Preferably when cross supports are used they are located on the back of the ribs and do not protrude or extend into the pathways defined by the air entry guides. Preferably the air entry guide structure is free of transverse structures, such as cross supports, or has less than 3, or 1 or no cross supports.
When the air entry guides are a separate structure from the lid, as is shown in
In addition to forming a sealed cavity to hold the lens and lens solution, the lid of the present invention may also cooperate with the lens support to maintain the lens centered around the support with minimal contact between the optical zone of the lens and the support and lid. For lenses with high shape memory, the ribs may be designed so that any contact between the lens and the lid or lens support while the case is sealed is transitory.
Cases which have a flip top may also have an air entry scoop 324, shown in
The cases may also comprise a burp or air admittance valve to allow air to vent into the lens case and above the lens to maintain the lens on the lens support during opening of the case.
For some lenses, it may be desirable to minimize contact between the lens and any air bubble in the case while it is sealed. This may be accomplished by designing the lens case cavity to contain a volume of solution that covers the lens, preferably in all storage orientations. The lens lid may also include one or more air outlet channels to allow air trapped in the case during closure to escape and minimize the amount of air in the closed lens case.
For cases, such as travel cases, which may be stored in multiple orientations, it may be desirable to include features within the case to capture the air bubble away from the lens. As discussed above, this may be more desirable with lenses with longer shape memories.
The lids of the present invention may further comprise at least one air capture space away from the lens optic zone for air in the sealed case to occupy. The air capture spaces are designed such that the air remains in at least one air capture space away from the lens regardless of case orientation. The air capture space may have a volume equal to or slightly greater than the volume of air to be sealed in the case, and any air which may diffuse into the case during storage to insure all the air present at sealing, and any that might diffuse in during storage are retained away from the optical zone of the lens.
The air capture space may be designed in a number of ways. For example, as shown in
The channel 431 may have the form of a ring as shown in
Instead of a channel, or incorporated into the channels, the air capture space may comprise at least two air pods protruding from the lid along the inner seal edge. The raised channel portions 431a in
The air pods and connecting channel may have any cross-sectional shape that can be molded, including rounded edges, half round or half oval, rectangular or square. The connecting channel may have an interior width of about 1.5 to about 3 mm when it is desirable for the air bubble to pass between pods, or about 0.5 to about 2 mm in designs meant to prevent the air bubble from leaving the pod.
Air captures channels and air pods can be included in a lid with or without dimples.
The lens support and lid may be designed to cooperate when in the sealed orientation to keep the lens centered around the support structure without resting on the support structure or lid. This is more important for lenses that have longer shape memory, such as silicone hydrogel lenses, and the optics of the lens can be distorted by extended contact with any packaging feature or any air bubble trapped in the case. Contact between the support, lid and contact lens during storage and shipping may be acceptable with conventional hydrogel contact lenses, as they have shorter shape memory.
The lens support may be designed in a number of configurations to provide the desired drainage and support so long as the primary functionalities of providing sufficient drainage and contact with the lens sufficient to insure consistent “one touch” lens transfer to the finger are met. It will be apparent to those skilled in the packaging art that the packaging features described herein may be used in a variety of combinations to achieve the desired one touch cases. For example, if lens solution is trapped between the lens and support, the efficiency of the drainage pathways may be increased, for example by increasing the open area beneath the lens support, decreasing the contact area between the lens and support, decreasing sharp edges and shallow drainage paths, adding a drainage channel, with or without a tilting or lifting means or a combination thereof. If the lens sticks to the lid upon opening, air entry guides and/or an air entry scoop may be added.
The benefits of the cases of the present invention are apparent in use.
Base collar is a cylinder which forms the cavity that houses the lens and lens support 536. The inside of the base collar may include a shelf 542 to receive the lens support. The shelf may support a portion of the lens support, such as peripheral ring 509 or a portion of the peripheral ring, or may be molded to follow the profile of the underside of the lens support, so long as the shelf shape and structure do not decrease the drainage performance.
Lens support 536 rests inside base collar 541. The lens support peripheral ring 509 may be expanded, or a second ring may be added below the peripheral ring to provide better fit within the collar and mechanical durability. Any lens support described above may be used in the lens case of
The walls of air entry guide ring 527 are displacement structures which when the case is closed, project into the base collar cavity and displace lens solution, ensuring the lens is fully submerged when the case is closed. When the lid and air entry guide structure are removed, the lens solution level drops below the peripheral ring, allow the lens solution to drain from the lens and lens support.
The lens case of
In the sealed state, shown in
In
In general, the lens support 536 holds the lens in the desired convex position, with minimal contact area when the case is opened to insure efficient transfer of the lens to the finger of the user. Inner chamber 544 (designated in
The case is opened by any convenient means, such as pulling tab 528 upward, which breaks seal 526 (
Referring to
Lid 535 and reservoir 519 may be polypropylene or any other material which can be used for medical device packaging, and base 540 may be formed with plastic.
As shown in
Because the contact area between the lens 550 and the lens support 536 are minimized and the lens solution effectively withdrawn, the wearer can remove lens 550 from the case with a single touch of a finger and adhere the convex side of the lens 550 to the finger. Thus, the apex of lens 550 is positioned on the finger and may be directly applied to the eye with its concave portion placed directly on the eyeball. There is no need for the wearer to transfer the lens from the fingers on one hand to those of the other, as is common with currently designed contact lens cases. This improved series of steps not only is easier and more convenient for the user, but it also reduces contamination due to bacteria carried on the user’s fingers.
Thus, the present invention provides cases which effectively channel lens solution away from the lens and lens support and control the ratio of the contact area between the finger and lens as compared to the area between the lens and the lens support, ensuring that surface tension between finger and lens exceeds surface tension between lens and lens support. The lens thus presented, consistently adheres to the finger, providing a “one touch” lens transfer experience to the wearer.
The cases of the present invention may be manufactured using known materials and processes. The packaging materials may be virgin, recycled or a combination thereof.
As described above, not all the features described herein need to be incorporated into every case, and those of skill in the art, using the teachings herein, can combine the features to provide a wide variety of one touch cases. For example, lens supports with central lens supports may be desirable for lenses with moduli less than about 25 psi, new wearers not used to one touch lens removal, or for wearers with a more forceful touch. Experienced wearers and those with a lighter touch may need cases with only peripheral supports. It will also be appreciated that the cases of the present invention provide numerous opportunities to include ornamental designs and features, for example in the design of peripheral supports and ring, arms, fins, air management pods and channels, as well as overall case shape and profile.
In summary, the contact lens cases of the present invention incorporate several novel functionalities which may be combined in a wide variety of combinations as described herein to provide the desired one touch packaging, including the following.
Preventing the lens from rotating off the support, which may be accomplished by Including a minimum of 3 points of contact on the periphery of the lens, which may be arranged in an acute triangle.
Preventing the lens translating horizontally across the support, which may be accomplished by a horizontal or near horizontal contact near the periphery of the lens, where the lens surface is more steeply angled (located outside a central region having a diameter of at least about 5 mm, about 6 mm, or about 7 mm, or the contacts can be just outside the periphery of the lens.
Maintaining the lens, after drainage, in its neutral or near neutral shape for presentation for lens transfer.
This may be accomplished by minimizing contact between the lens apex and the support, which can be done by providing a central lens support with about 0.5 to about 2 mm, about 0.5 to about 1.5 mm, or about 0.8 to about 1 mm clearance between the top of the flat top section and the lens apex or leaving a void at least about 6 mm in diameter and clear from the lens apex to about the level of the base of the lens.
It is beneficial to increase finger surface area as well as control dab force and contact time upon dabbing.
For lenses with low moduli this requires a stiffened structure under the apex of the lens, which may also improve the consistency of transfer for lenses with higher moduli, including silicone hyrdogels. When present, the height of the structure is no lower than the base of the lens. The support structure may also be less than 2 mm below lens apex.
The optical zone is free floating and contact with the lens support during storage is transitory or non-existent. This can be achieved by making any central supports slightly lower than the profile of the lens (so that the lens only contacts the support at the periphery).
The following were used in the Examples, below.
Buffered solution: 1000 g Dl water, 13.55 gm NaCl, 27 gm boric acid, 5 gm sodium borate, 0.3 gm EDTA, and having a pH of about 7.4.
Packaging solution: RevitaLens Complete (Alexidine 0.00016%; Polyquaternium-1 0.0003% (PQ-1); EDTA.
Polypropylene: isotactic polypropylene homopolymer, having an MFR of 24 g/10 min, (Lumicene M3766) from Total
Lidstock: multilayer film comprising layers of oriented polypropylene (12 µm), aluminum foil (50 µm) and polyester film (12 µm).
Several lens support architectures were evaluated to determine support features which can provide desirable lens support, lens solution drainage and lens transfer. Each of the evaluated lens supports was 3D printed on a Form 2, using Formlabs Formlabs clear resin. The lens supports were printed with a drainage channel terminating in a 90° lever to allow the support and lens to be lowered and raised from a packaging solution chamber having dimensions 30 mm x 45 mm x 25 mm.
A 1-Day ACUVUE MOIST contact lens was removed from its package and placed on each lens support while the support is submerged in packaging solution to allow for full wetting, and mounting the lens centered on the support. The lens support and lens were submerged in the packaging solution chamber for at least 5 seconds, to insure is fully submerged with no air bubbles remained under the lens. Using an eye dropper, the packaging solution was withdrawn to expose the peripheral support. The support was then slowly pivoted from the remaining packaging solution using the lever and allowed to drain until the solution appeared to have drained from the lens and support or after about 10 seconds, which ever was sooner. The lens was evaluated for permanent fluid films, solution reservoirs and internal bridges between the lens and support. Photographs were taken and evaluated for lens centration, areas of fluid trapped between the lens support arms and the lens and lens deformation.
To ensure a consistent dab surface and simulate a low adhesion finger, a rubber nitrile glove was worn on the hand used for dab testing. The test was repeated at least 5 times for each support design, changing out the lens after 2 repeats.
The results are shown in Table 1, along with a representative photograph, and a CAD drawing showing the lens support configuration.
Table 1
The drainage for each lens was categorized on the following properties:
Permanent fluid films (“Perm. Films) are films that form between the lens support structure and the (outside) surface of the lens and do not break after drainage. The following rating scale was used:
Solution reservoirs (“reservoirs”) are larger volumes of solution that are retained on the inside of the lens, after drainage has taken place. The following rating scale was used:
Internal fluid bridges (“Bridges”) are regions where fluid menisci bridge between the support structure and the lens. The following rating scale was used:
Drainage speed is the time between lifting the lens out of solution until no more change in drainage is observed. The following rating scale was used:
As the packaging solution drains from the contact lens, films of packaging solution may form between lens edge and peripheral ring. Films formed at beginning of drainage are good, and for lens supports with good drainage, the films break before drainage is completed. Residual films remaining once drainage has stabilized can interfere with lens transfer. Films noted in the tables are residual films that remained once drainage had stabilized.
Examples where the lens deforms and wraps onto the support structure tend to hold more solution in the lens. This can be detrimental to dabbing (Comparative Example 1), or slow down drainage (Example 4). The arrangement of both peripheral supports and central supports are important in reducing and preventing wrapping. Lens wrapping is significantly reduced with 6 peripheral supports (Example 3) compared to 4 peripheral supports (Example 4). A poorly distributed central support (Comparative Example 1) had much more wrapping than a well-distributed central support (Example 3).
The peripheral ring can also reduce lens wrapping, due to the surface tension of the films formed around the periphery of the lens. Example 1 showed less lens wrapping than Example 2 (no ring).
Example 5 is the same lens support as Example 3, but with a peripheral ring added around the peripheral supports. Both Example 5 and 3 showed excellent drainage speed (moderate-fast and fast respectively) and excellent drainage efficiency evidenced by no permanent fluid films, small solution reservoirs and only light internal fluid bridges.
Example 6 is the same lens support design as Example 2, but the arms are solid fins which connect to the peripheral supports. The filling in the arm structures slowed the drainage speed, but the drainage efficiency was the same as Example 2, confirming that lens supports of the present invention with open arms or solid fins can provide good drainage and consistent lens transfer. The comparison between Example 2 and Example 6 also shows that drainage speed may be decreased by removing structures below the lens support (such as solid fins).
The lens support of Comparative Example 2 has a similar structure to Example 1, but with curved side sections, which formed severe internal fluid bridges which caused the lenses to stick to the lens support, creating undesirably high lens to support contact area. The increased contact resulted in a 0% transfer rate upon finger dabbing. Thus, support structures that form more solution bridges are less likely to dab successfully. The lens support of Comparative Example 3 had a fully curved lens support, with a smaller radius than the lens support of Comparative Example 2, but still evidenced undesirable solution reservoirs and internal fluid bridges. Comparative Example 3 also had a fully curved top section, which provided insufficient contact area between the lens and finger upon dabbing (0% first time dabbing success).
The lens support testing was repeated as described in Examples 1 using the lens supports shown in Table 2.
Table 2
The lens support of Example 7 has the same structure as Example 1 except 4 of the side sections were removed, which resulted in faster and more efficient drainage. The lens supports of Examples 1, 5 and 7 show that lens supports having substantially flat top regions and peripheral supports with a variety of side or center column supports provide both excellent drainage and lens transfer. Examples 8 and 9 show that drainage can be improved by removing some or all of the side sections from the lens support. Comparative Examples 3 and 4 and Example 8 show that the arms in the flat top section can be removed and the top of the side section can provide the functionality of the flat top. Comparing Example 8 to Comparative Example 4, it can be seen that drainage and lens transfer can be improved by widening the width of the central void at the base. The lens support of Comparative Example 4 provided slightly worse drainage than Example 8 as packaging solution could pool in the base of the cone in Comparative Example 4. This was readily improved by widening the width of the central void at the base (Example 8). Comparing Example 8 to Comparative Example 3 shows that increasing the angle of the side arms away from the lens decreases solution bridges and improves drainage speed.
Example 2 was repeated except that the drainage gap between the elongated peripheral support was filled in. The results (with the data from Example 2 copied for ease of reference) are shown in Table 3, below.
Table 3
The procedure of Example 1 was repeated but lens supports comprising peripheral supports without any central supports were evaluated. The results are shown in Table 4, below.
Table 4
Examples 9, 10 and Comparative Example 6 displayed significant lens movement during opening, which could be improved by providing one or more positioning guide along the top of one or more of the peripheral supports. Examples 9 and 10 show that lens supports with only peripheral supports and no central column can provide good drainage and lens transfer. Example 10 had an 8 mm gap between opposite peripheral supports, with one side of the drainage channel extending to the center of the support. The lens support of Comparative Example 6 is similar to that of Example 10, but without a peripheral support arm extending under the center of the lens. The lack of a structure in the center of the lens, caused the lenses to collapse in the center during drainage or upon attempted lens transfer, and also provided insufficient resistance during lens transfer. The ACUVUE Moist lenses used have a very low modulus, and lenses with higher moduli, such as silicone hydrogels, will not collapse as readily. As is shown by Examples 9 and 10, extending at least one peripheral support arm under the lens center decreases the collapse of the lens in the center, and provides good lens transfer. A flat dome can be designed with sufficient surface area to suck the lens to the dome to prevent the lens moving (Comparative Example 10) but it also prevents dabbing.
Example 7 was repeated varying the diameter of the peripheral ring as shown in Table 5. The support having a peripheral ring of 16 mm trapped solution between the lens and support. The supports with 18 and 25 mm peripheral rings both provided good drainage with few reservoirs of trapped packaging solution. While the 16 mm diameter used in the support for Example 14 was too small for a lens with a diameter of 14.2 mm, it would be acceptable for a lens with a smaller diameter.
Several lens support architectures were evaluated to determine support features which can provide desirable lens support, lens solution drainage and lens transfer. Each of the evaluated lens supports was 3D printed on a Form 2, using Formlabs Formlabs white resin. The lens supports were printed with “L” shaped grips on opposite sides of the lens support to allow the support and lens to be lowered and raised from a packaging solution chamber having dimensions 30 mm x 45 mm x 25 mm.
A 1-Day ACUVUE MOIST contact lens was removed from its package and placed on each lens support while the support is submerged in packaging solution to allow for full wetting, and mounting the lens centered on the support. The lens support and lens were submerged in the packaging solution chamber for at least 5 seconds, to insure is fully submerged with no air bubbles remained under the lens. The lens holder was slowly lifted out of the chamber and set on a support of a similar size to the solution chamber, but with only two sides to support the grips. The lens holder was allowed to drain for about 10 seconds (until the drainage stopped changing) before evaluating the drainage and lens transfer. Photographs were taken and evaluated for lens centration, areas of fluid trapped between the lens support arms and the lens and lens deformation.
To ensure a consistent dab surface and simulate a low adhesion finger, a rubber nitrile glove was worn on the hand used for dab testing. The test was repeated at least 5 times for each support design, changing out the lens after 2 repeats.
The results are shown in Table 6, along with a representative photograph, and a CAD drawing showing the lens support configuration.
Table 6
Drainage and hence dabbing are better when a vertical or highly angled fluid film is formed between the lens and the drainage reservoir (base of the pack or test setup) and breaks before dabbing. Example 15 formed fluid films between the periphery of the lens and the lower peripheral ring and drained well. Comparative Example 10 and Comparative Example 9 did not form vertical films and both drained poorly despite having very similar geometry to Example 15. The lens supports of Example 15, which had a flat top section and straight side sections with a width at the elbow of 7 mm, provided good drainage with minimal lens-lens support contact, which provided consistent first-time transfer on finger dabbing (80%).
In cases when the films broke prematurely in Example 15, the lens did not drain as well.
Horizontal films are not sufficient for drainage. Films are formed between the lens and the outer ring in Comparative Example 8, however the lens still didn’t drain. Horizontal films also tend to be much more difficult to break, and hence impede lens removal.
The present invention includes the following embodiments/elements/features in any order and in any combination.
1. A contact lens case comprising
2. A contact lens case comprising
3. The contact lens case of claims 1 or 2 wherein the support allows lens solution to drain from the lens and support when removed from the lens solution without trapping packaging solution between the lens and lens support.
4. The contact lens case of claims 1 or 2 wherein the lens further comprises an optic zone and the lens support further comprises, under at least a portion of the contact lens optic zone, a substantially flat top section with an open structure.
5. The contact lens case of claims 1 or 2 wherein said support further comprises a void under at least a portion of the contact lens optical zone.
6. The contact lens case of claims 1 or 2 wherein the contact lens is maintained in an uncompressed state when the case is sealed.
7. The contact lens case of claims 1 wherein the support comprises at least two peripheral supports.
8. The contact lens case of claim 2 or 7 wherein the peripheral supports are distributed around the lens periphery.
9. The contact lens case of any of the foregoing claims wherein the lens comprises an apex centered in the optic zone, and the support further comprises a central support having a height, measured from the lens periphery, of not greater than 0.5 mm below the contact lens apex.
10. The contact lens case of claim 9 wherein the central lens support further comprises a diameter of about 1 to about 10 mm, about 3 mm to about 9 mm, about 5 mm to about 9 mm, or about 6 mm to about 9 mm.
11. The contact lens case of claims 9 or 10 wherein the central lens support has open structure.
12. The contact lens case of claim 11 wherein said central lens support comprises a central column under the lens apex.
13. The contact lens case of claim 11 wherein said central lens support comprises a plurality of arms each arm comprising:
a flat top section, an optional side section and an optional peripheral support, a shoulder transition connecting the top and optional side sections, and an optional elbow transition connecting the optional side and optional peripheral support.
14. The contact lens case of claim 13 wherein the arms in the flat top section connect to each other in a center point under the lens apex, or connect to an open full or partial ring centered under the lens apex.
15. The contact lens case of claim 13 wherein the plurality of arms are in the form of fins connected to the case base.
16. The contact lens case of claim 13 wherein one end of at least some of the plurality of arms is attached to the peripheral lens supports and project upward and distal ends of the arms form the flat top section.
17. The contact lens case of any of the foregoing claims wherein at least some of the distal ends the peripheral supports are connected to vertical supports which raise the peripheral supports from the lens base.
18. The case of claims 2 to 17 further comprising at least a partial ring around the distal ends of the peripheral supports, at least 2 mm beyond the contact lens peripheral edge.
19. The case of claim 13-18 further comprising three to eight arms.
20. The case of claims 13-18 further comprising three to six arms.
21. The case of claim 13-20 wherein at least two of said arms have a Y shape.
22. The case of claim 13-20 having 3 Y-shaped arms.
23. The case of claim 13-20 comprising 2 straight arms and 2 Y-shaped arms.
24. The case of claim 21-23 wherein said Y-shaped arms comprise a curve across a top portion of the Y.
25. The case of any of claims 13-20 wherein said arms are straight.
26. The case of claim 18 wherein at least partial ring has a diameter of between about 16 and about 25 mm, about 18 and about 25 mm or about 18 and about 24 mm.
27. The case of claim 4 wherein said substantially flat top portion has a height of 0.5 mm, about 0.5 to about 2 mm, 0.5 to about 1.5 mm, or about 0.8 to about 1 mm of deflection from the contact lens apex in an undeformed state.
28. The case of any of claims 9-27 wherein the support further comprises a central fillet centered in the flat top section having a width of about 0.1 to about 3 mm; about 0.1 to about 2 mm, or less than 1.5 mm across its longest dimension.
29. The case of claims 13-28 wherein each of the arms and peripheral supports have a width of about 0.5 to about 1.5 mm, about 0.5 mm to about 1 mm, or about 0.5 mm to about 0.7 mm.
30. The case of claims 13 to 29 wherein the arms have a width which provides part moldability and efficient packaging solution drainage upon opening.
31. The case of claims 13-30 wherein each arm has a height at the flat top section of about 0.5 to about 5 mm.
32. The case of any of claims 9 to 29 wherein the flat top has a center point in the center of the lens support and the shoulders are disposed radially around the flat top center.
33. The case of claim 32 wherein the arms attach at the center point and each arm has a length from the shoulder to the center point of about 1.5 to about 4 mm.
34. The case of any of the claims 9-33 wherein the angle from vertical at the flat top and side sections of the arm is up to about 15°, or between about 1° and about 10°.
35. The case of any of the foregoing claims wherein the angle between the side section and the peripheral support is between about 60° and about 120°, or about 80° and about 100°.
36. The case of any of the foregoing claims wherein the arms connect in the center of the flat top portion.
37. Case of any of the foregoing claims wherein the arms are radially distributed around the center of the support structure.
38. The case of any of the foregoing claims wherein the base is substantially flat.
39. The case of any of the foregoing claims wherein the lens does not contact the arm side sections.
40. The case of any of the foregoing claims wherein the arm side sections are straight.
41. The case of any of the foregoing claims wherein the support is made from a polymer having a contact angle of greater than 100°.
42. The case of any of the foregoing claims wherein the lens support is disposed at an angle of at least about 20° from the case base.
43. The case of any of claims 2-42 wherein said peripheral supports are parallel to the case base, and at least about 4 mm or at least about 5 mm from said case base.
44. The case of any of the foregoing claims further comprising a means for lifting the lens support from the lens solution.
45. The case of claim 44 wherein the lifting means is selected from levers, springs, hinges, pivot arms, folds, mechanical traps, handles and combinations thereof.
46. The case of claim 54 wherein the lifting means raises the lens from the packaging solution by tilting the lens support away from the base to an angle of about 15 to about 80°, about 20° to about 70°, about 30° to about 60° or about 40° to about 60° relative to level.
47. The case of any of the foregoing claims further comprising a reservoir for capturing packaging solution when the lens and support are separated from the case base.
48. A contact lens case comprising
49. The contact lens case of claim 48 wherein the case interior defines a cavity comprising the support, at least one air entry guide, contact lens and packaging solution; and
upon opening the case and draining the packaging solution from the lens and the but prior to contact by a user’s finger the lens maintains a convex shape on the lens support, and the support contacts the lens in at least two points distributed around the lens periphery.
50. The case of claims 48 or 49 wherein the lens has a profile and the support has a profile that does not substantially match the lens profile.
51. The case of claim 48-50 wherein the contact area between the support and the lens after the case is less than about 20 mm2, less than 18 mm2 or less than 15 mm2.
52. The case of claims 48-50 wherein contact area between the at least one air entry guide and the lens is less than about 50 mm2 or less than about 30 mm2.
53. The case of claims 48-52 wherein the air entry guides are integral with the lens facing surface as projections from the lens facing surface, or recesses in the lens facing surface.
54. The case of claims 48-52 wherein the air entry guides are part of a separate structure disposed between the convex lens surface and the lid lens facing surface.
55. The case of claims 48-54 wherein the air entry guides are aligned parallel to a path air enters upon case opening.
56. The case of claims 48-55 wherein the air entry guides spaced at least about 2 mm apart, about 2 to about 5 mm apart, or 2 to about 4.5 mm apart.
57. The case of claims 48-56 wherein the contact lens comprises an optic zone, and a curved lens side section between the optic zone and the peripheral edge, and the air entry guides run in a straight line from the case front to back, curve around the optic zone or a combination thereof.
58. The case of claims 48-57 wherein the air entry guides traversing the optic zone have a shorter profile over the optic zone.
59. The case of claims 48-58 wherein the air entry guides comprise continuous ribs, discontinuous ribs and combinations thereof.
60. The case of claims 48-59 wherein the air entry guides have a maximum height of at least about 2 mm, or about 2 mm to about 4 mm.
61. The case of claims 60 wherein the air entry guide profile over the optic zone has a height of about 0.5 mm or less.
62. The case of claims 1 and 48 further comprising at least one base section and at least one lid facing surface which together form a reversibly sealed cavity comprising within the cavity the support, contact lens and lens solution.
63. The case of claims 2-62 wherein said lid facing surface is an interior surface of a case lid; and the case further comprises at least one base section, which with the lid forms the cavity containing the lens support, lens and packaging solution;
the case further comprising at least one opening tab for initiating the separation of the lid from the base along a seal line forming the cavity.
64. The case of any of the foregoing claims comprising an opening tab for initiating the separation of the lid from the base along a seal line forming the sealed cavity, wherein there is at least about 2 mm clearance between the seal line and lens support at the opening tab.
65. The case of claims 48-61 and 63-64 wherein the air entry tab further comprises at least one air entry guide.
66. The case of claims 48-61 and 63-65 wherein the lens support, lens facing surface and at least one air entry guide cooperate to maintain the lens centered around the support with minimal contact between the lens, the support and at least one air entry guide.
67. The case of claim 66 wherein contact between the lens, the at least one air entry guide and the support is transitory.
68. The case of claims 48-61 and 63-67 further comprising an air capture space away from the lens optic zone for air in the cavity to occupy.
69. The case of claim 68 where the air remains in the air capture space away from the lens regardless of case orientation.
70. The case of claims 69-69 wherein the air capture space has a volume equal to or slightly greater than the volume of air to be sealed in the case.
71. The case of any of the foregoing claims where the base and lid are a single unitary part.
72. The case of any of the foregoing claims where the base and lens support are a single unitary part.
73. The case of any of the foregoing claims where the base, lens support and lid are a single unitary part.
74. The case of claims 2-47 and 62-73 wherein the lid and the base form a watertight seal when closed.
75. The case of claim 75 where said the seal is selected from a screw top seal or a snap seal.
76. The case of claims 74-75 further comprising a burp valve.
77. The case of claims 74-76 wherein said base comprises two sections, a lens support section and a lens solution holding section.
78. The case of claims 2-47 and 74-77 further comprising a spring under the lens support which raises the lens support from the lens solution when the lens case is opened.
79. The case of claim 77 wherein the lens solution holding section forms a seal with around the lens support, and lens solution is introduced into the lens holding section, and the contact lens is placed on the lens support.
80. The case of claim 79 comprising two lids, one that seals to the solution holding section and upon opening engages the solution holding section, exposing the lens support section, and the other that opens to expose the solution holding section.
81. The case of claim any of the foregoing claims further comprising at least one displacement means.
82. The case of claims 2-47 and 62-73 wherein the lens is placed in the lid in a concave orientation, with lens solution, the case is closed by placing the base on top of the lid, with the lens support facing toward the concave lens surface and sealing the base and lid to form a watertight seal, and for storage and opening, the lens case is flipped so the lens is disposed on the lens support in a convex position.
It is to be understood that the present invention is to be determined from the appended claims and their equivalents.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IB2021/058380 | 9/14/2021 | WO |
| Number | Date | Country | |
|---|---|---|---|
| 63077784 | Sep 2020 | US |
