Intraocular lens based on liquid lens

Abstract

The utility model belongs to the field of artificial lenses, and particularly discloses an artificial lens based on a liquid lens. The intraocular lens includes: an annular stent; the artificial muscle is fixed on the inner side of the annular bracket; the liquid lens is connected with the artificial muscle, the liquid lens is arranged at the center of the annular support, and the focal length of the liquid lens can be changed by adjusting external voltage; and the wireless receiving coil is arranged on the annular bracket, is electrically connected with the liquid lens, and is used for receiving the wireless induction electric energy and applying an external voltage to the liquid lens. According to the intraocular lens, the focal length can be changed by adjusting the external voltage of the liquid lens, the focal length adjusting mode is simple and easy to control, and the accuracy is high.

Description

Technical Field

[0001] The utility model belongs to the field of artificial lenses, and in particular relates to an artificial lens based on a liquid lens. Background Art

[0002] Due to the disorder of lens metabolism, the lens protein denatures and becomes turbid, so that the light is blocked by the turbid lens and cannot reach the retina, which causes vision loss and forms cataracts. Cataract patients have blurred vision and may even be blind in severe cases. Surgery is an effective means of treating cataracts. Ultrasound is used to crush the lens nucleus into a chyle, and then the chyle lens nucleus is sucked out, but the lens capsule is retained. The capsule is retained and a posterior chamber intraocular lens is implanted at the same time, and vision can be restored after surgery. The implanted intraocular lens may not be "fitting". Unlike the lens of a normal person, the intraocular lens can change shape under the action of the ciliary muscle to adjust the light entering the eye to focus on the macula of the retina. After the patient uses the intraocular lens, because the intraocular lens has no adjustment function, it cannot automatically focus the light emitted (reflected) by near and far objects on the macula as needed, which causes some visual discomfort: for example, if the vision is good at far distance, the vision is poor at near distance; if the vision is good at near distance, the vision is poor at far distance.

[0003] In order to enable patients to have clear vision at both near and far distances after implanting artificial lenses, traditional technology further proposes multifocal artificial lenses and adjustable artificial lenses. Among them, multifocal artificial lenses, that is, artificial lenses with multiple focal lengths of different lengths on the lens, so that after the near and far light passes through the multifocal artificial lens, part of the light will form a clear image on the retina. However, this multifocal artificial lens forms multiple imaging focuses in the eye, which requires the brain to "adapt", and the patient will have problems such as glare, halo or poor night vision. These multifocal artificial lenses are not adjustable artificial lenses and cannot fully realize the normal adjustment function of the eye. For adjustable artificial lenses, patients implanted with the lens can change the shape of the lens through the relaxation and contraction of their own ciliary muscles to achieve far and near vision. However, for older patients, the contraction force of the intraocular muscles themselves is relatively small, and the elasticity of the lens fibers in the lens capsule becomes poor, which increases the force required for adjustment. Therefore, the ability to adjust is limited and cannot truly meet the function of adjustable artificial lenses.

[0004] Therefore, an intraocular lens with adjustable focal length is urgently needed in the art. Utility Model Content

[0005] The utility model aims to provide an artificial lens with adjustable focal length based on a liquid lens, so as to overcome the defect that the artificial lens in the prior art has no self-adjustment ability or has limited self-adjustment ability.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] According to the utility model, an intraocular lens based on a liquid lens is provided, which comprises:

[0008] Ring bracket;

[0009] an artificial muscle fixed to the inner side of the annular support;

[0010] A liquid lens connected to the artificial muscle, wherein the liquid lens is arranged at the center of the annular support, and the focal length of the liquid lens can be changed by adjusting an applied voltage;

[0011] A wireless receiving coil is arranged on the annular bracket, the wireless receiving coil is electrically connected to the liquid lens, and the wireless receiving coil is used to receive wireless induced power and apply an external voltage to the liquid lens to adjust the distance between the liquid lens and the cornea along the axial direction of the eye axis.

[0012] According to an embodiment of the utility model, the liquid lens is cylindrical and is coaxially arranged with the annular support.

[0013] According to an embodiment of the utility model, the artificial muscle is an electrically induced artificial muscle, and its electrically controlled bending direction corresponds to the axial direction of the annular bracket. The wireless receiving coil is electrically connected to the artificial muscle for applying a control voltage to the artificial muscle.

[0014] According to an embodiment of the utility model, the artificial muscle is ring-shaped, an outer edge of which is connected to the ring-shaped support, and an inner edge of which is connected to the liquid lens.

[0015] According to an embodiment of the present invention, the artificial muscle comprises a plurality of annular electrodes, which are concentrically arranged at intervals and are used to control the bending amplitude of the artificial muscle.

[0016] According to an embodiment of the utility model, the artificial muscle is a plurality of strip-shaped artificial muscles, one end of each strip-shaped artificial muscle is connected to the annular support, and the other end is connected to the liquid lens.

[0017] According to an embodiment of the utility model, the annular bracket forms an annular closed chamber, and the wireless receiving coil is accommodated in the closed chamber.

[0018] According to one embodiment of the utility model, the annular bracket includes an annular main body portion and an annular cover portion, the annular main body portion and the annular cover portion are connected to form the closed chamber, the cross-section of the annular main body portion is U-shaped, the annular main body portion includes an inner side wall located on the inner side and an outer side wall located on the outer side, a plurality of snap openings are respectively arranged on the inner side wall and the outer side wall, a plurality of snap protrusions are respectively arranged on the inner edge and the outer edge of the annular cover portion, and the snap protrusions are used to snap into the snap openings.

[0019] According to one embodiment of the utility model, the artificial lens also includes a control circuit arranged on the annular bracket, the wireless receiving coil is electrically connected to the control circuit, the control circuit is electrically connected to the liquid lens or both the liquid lens and the artificial muscle, and the control circuit modulates the output of an external voltage signal based on the wireless induced electric energy received by the wireless receiving coil, and applies it to the electrode of the liquid lens or the electrodes of both the liquid lens and the artificial muscle.

[0020] According to one embodiment of the present utility model, the control circuit comprises:

[0021] a rectifier circuit, the rectifier circuit being connected to the wireless receiving coil and being used for converting the alternating current received by the wireless receiving coil into direct current;

[0022] A bioelectric signal acquisition unit, which is attached to the ciliary muscle surface of the ciliary body and is used to sense the contraction changes of the ciliary muscle and generate a control signal;

[0023] A control chip, wherein the control chip is electrically connected to the bioelectric signal acquisition unit and the rectifier circuit respectively, and is used to generate a corresponding PWM signal according to the control signal, and output the PWM signal to the control end of the rectifier circuit to control the rectifier circuit to output a DC power of corresponding magnitude.

[0024] According to one embodiment of the present invention, the control circuit further includes one or more of the following:

[0025] A filter subcircuit, the filter subcircuit is used to filter the direct current output by the control circuit;

[0026] A voltage stabilizing subcircuit, the voltage stabilizing subcircuit is used to stabilize the direct current output by the control circuit and output a stabilizing signal;

[0027] The commutation power supply sub-circuit is used to control the polarity of the direct current output to the electrode.

[0028] By adopting the above technical solution, the utility model has at least one of the following beneficial effects:

[0029] The artificial lens based on liquid lens provided by the utility model adopts liquid lens to replace the conventional convex lens. The curvature of the liquid interface (also called lens surface) in the liquid lens can be changed by adjusting the external voltage of the liquid lens, and then the focal length can be changed, thereby realizing the adjustable focal length of the artificial lens.

[0030] The liquid lens-based artificial lens provided by the utility model is made into an integral part by connecting an annular bracket, an artificial muscle, a liquid lens and a wireless receiving coil, which can be conveniently implanted into a lens capsule, thereby avoiding the calibration and adjustment of the relative positions of different components during surgical installation and user use, and reducing the complexity of the operation.

[0031] The artificial lens based on the liquid lens provided by the utility model can change the deformation of the artificial muscle by adjusting the control voltage of the artificial muscle, drive the liquid lens to move closer to or away from the cornea, thereby realizing the adjustable focal length of the artificial lens. In this case, the focal length can be selectively adjusted by adjusting the curvature of the lens surface and / or adjusting the deformation of the artificial muscle, further expanding the focal length adjustment range.

[0032] The liquid lens-based artificial lens provided by the utility model has an adjustable focal length, and the focal length adjustment method is simple, easy to control and highly accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A schematic structural diagram of an intraocular lens based on a liquid lens provided in one embodiment of the utility model;

[0035] Figure 2 for Figure 1 The schematic diagram of the state of the liquid lens-based intraocular lens after implantation into the human eye is shown;

[0036] Figure 3 A front view of a ring-shaped bracket used in an embodiment of the utility model;

[0037] Figure 4 for Figure 3 A partial cross-sectional view of the annular main body of the annular bracket shown;

[0038] Figure 5 for Figure 3 A schematic structural diagram of the annular cover portion of the annular bracket shown;

[0039] Figure 6 A schematic diagram of the working principle of the artificial muscle used in one embodiment of the utility model;

[0040] Figure 7 A schematic diagram of the structure of an artificial muscle used in an embodiment of the utility model;

[0041] Figure 8 This is a schematic structural diagram of a liquid lens used in one embodiment of the utility model.

[0042] Description of Reference Numerals

[0043] 1. Artificial lens;

[0044] 11 annular bracket; 111 annular main body; 1111 inner side wall; 1112 outer side wall; 1113 bottom wall; 1114 snap opening; 112 annular cover plate; 1121 inner edge; 1122 outer edge; snap protrusion 1123;

[0045] 12 artificial muscle; 121 annular electrode; 122 a first electrically-controlled bending region, 123 a second electrically-controlled bending region or 124 a third electrically-controlled bending region;

[0046] 13 liquid lens; 131 container; 132 first circular glass sheet; 133 second circular glass sheet; 134 electrolyte; 135 non-electrolyte; 136 lens layer; 137 first metal electrode; 138 second metal electrode; 139 insulating material;

[0047] 14 wireless receiving coil;

[0048] 2 Lens capsule; 3 Ciliary body; 4 Sclera; 5 Retina; 6 Vitreous body; 7 Cornea. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0050] It should be noted that, in the description of the present invention, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "longitudinal" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0051] The terms "including" and "having" and any variations thereof in the specification and claims of the present utility model are intended to cover non-exclusive inclusions; the terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish different objects rather than to describe a specific order. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0052] In the specification and claims of the utility model, when an element is referred to as being "fixed on" or "mounted on" or "disposed on" or "connected to" another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it may be directly or indirectly connected to the other element.

[0053] It should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the drawings, can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned in this article.

[0054] As mentioned in the background technology section, the artificial lens in the prior art does not have the self-adjustment ability or has limited self-adjustment ability. Therefore, the present invention aims to provide an artificial lens based on a liquid lens with adjustable focal length to solve the above problem.

[0055] Figure 1 The schematic diagram of the structure of an artificial lens based on a liquid lens provided by an embodiment of the utility model is shown, wherein (a) is a side view and (b) is a front view. As shown in the figure, the artificial lens based on a liquid lens 1 provided by the utility model comprises: an annular support 11; an artificial muscle 12 fixed to the inner side of the annular support 11; a liquid lens 13 connected to the artificial muscle 12, the liquid lens 13 is arranged at the center of the annular support 11, and the focal length of the liquid lens 13 can be changed by adjusting the applied voltage; a wireless receiving coil 14 ( Figure 1 Not visible in Figure 4 As can be seen in the figure, the wireless receiving coil 14 is electrically connected to the liquid lens 13, and the wireless receiving coil 14 is used to receive wireless induced power and apply an external voltage to the liquid lens 13.

[0056] Specifically, the wireless receiving coil 14 is used to sense the electromagnetic waves sent by the peripheral device to obtain an AC induced electromotive force. The peripheral device can be set as wearable glasses, for example. The wearable glasses (such as their frames) can be integrated with a wireless transmitting coil, which can send electromagnetic waves to the wireless receiving coil 14 so that the wireless receiving coil 2 can induce and generate electrical energy. In the utility model, the passive design of the internal circuit is realized by using the wireless receiving coil 14 to power the device, which is used to ensure the safety of the human eye.

[0057] Figure 2 The schematic diagram of the state of the artificial lens 1 provided by the utility model after being implanted in the human eye is shown. As shown in the figure, the artificial lens 1 provided by the utility model is implanted in the lens capsule 2 of the human eyeball, and the lens capsule 2 is expanded and fixed by the lens capsule 2. In the installed state, the axis of the annular support 11 of the artificial lens 1 coincides with the eye axis (or corneal axis) of the human eye. Figure 2 , reference numeral 3 denotes a ciliary body, reference numeral 4 denotes a sclera, reference numeral 5 denotes a retina, reference numeral 6 denotes a vitreous body, and reference numeral 7 denotes a cornea.

[0058] The artificial lens 1 based on a liquid lens provided by the utility model adopts a liquid lens 13 to replace the conventional convex lens. The curvature of the liquid interface (also called the lens surface) in the liquid lens 13 can be changed by adjusting the applied voltage of the liquid lens 13, and then the focal length can be changed, thereby realizing the adjustable focal length of the artificial lens. In addition, by adjusting the applied voltage range and size of the liquid lens 13, the curvature of the lens surface can be accurately adjusted, thereby improving the accuracy of the focal length adjustment. It should be noted that the adjustable focal length in the "artificial lens based on a liquid lens with adjustable focal length" in the utility model refers to the adjustable focal length of the system formed by the artificial lens and the cornea.

[0059] The liquid lens-based artificial lens 1 provided by the utility model is made into an integral part by connecting an annular bracket 11, an artificial muscle 12, a liquid lens 13 and a wireless receiving coil 14, which can be conveniently implanted into a lens capsule 2, thereby avoiding the calibration and adjustment of the relative positions of different components during surgical installation and user use, and reducing the complexity of the operation.

[0060] The various components of the liquid lens-based intraocular lens 1 are described in detail below.

[0061] The annular support 11 is used to expand the lens capsule 2. The friction between the outer side of the annular support 11 and the inner wall of the lens capsule 2 can prevent the intraocular lens 1 from twisting, translating and rotating in the lens capsule 2. The annular support 11 can be made of a flexible material with good biocompatibility, such as titanium alloy, platinum-iridium alloy, etc.

[0062] The wireless receiving coil 14 is mounted on the annular bracket 11. In some embodiments, the annular bracket 11 is formed with an annular closed chamber, and the wireless receiving coil 14 can be accommodated in the closed chamber to protect the wireless receiving coil 14. In other embodiments, the annular bracket 11 is formed with an unclosed mounting portion, and the wireless receiving coil 14 can be mounted in the unclosed mounting portion.

[0063] Figure 3-5 An example structure of the annular support 11 is shown. As shown in the figure, the annular support 11 is composed of Figure 4 The annular main body 111 and Figure 5 The annular cover plate portion 112 shown is composed of two parts. The annular main body portion 111 and the annular cover plate portion 112 are assembled together to form a closed chamber for accommodating the wireless receiving coil 14.

[0064] like Figure 4 As shown, the cross section of the annular main body 111 is U-shaped, and the annular main body 111 is composed of an inner side wall 1111 located on the inner side, an outer side wall 1112 located on the outer side, and a bottom wall 1113 connecting the inner side wall 1111 and the outer side wall 1112. The inner side wall 1111 and the outer side wall 1112 form two side parts of the U shape, and the bottom wall 1113 forms the bottom of the U. A plurality of buckle openings 1114 are provided on the inner side wall 1111 and the outer side wall 1112 at intervals.

[0065] like Figure 5 As shown, a plurality of snap protrusions 1123 are spaced apart on the inner edge 1121 and the outer edge 1122 of the annular cover portion 112, and the snap protrusions 1123 can be snapped into the snap openings 1114 on the annular main body portion 111, so that the annular cover portion 112 can be detachably assembled with the annular main body portion 111 to form a closed chamber.

[0066] In some embodiments, in order not to affect wireless power transmission, the annular cover portion 112 can be made of non-metallic materials compatible with human tissue, such as silicone. When in use, the side of the annular bracket 11 with the annular cover portion 112 faces the wireless transmitting coil, so as to facilitate the electromagnetic field to pass through the annular cover portion 112 and induce alternating current on the wireless receiving coil 14. In this case, the multiple snap-on protrusions 1123 radially arranged on the inner edge 1121 of the annular cover portion 112 can be set as metal electrodes embedded in the silicone plate, one end of which extends from the thickness edge of the annular cover portion 112, and the other end extends from the inner surface of the annular cover portion 112 and is electrically connected to the wireless receiving coil 14 arranged on the inner side of the annular cover portion 112.

[0067] In some other embodiments, the annular cover plate portion 112 can be directly used as a wireless receiving coil. Specifically, the annular cover plate portion 112 is made of a metal wire (such as a platinum-iridium alloy wire). The multiple buckle protrusions 1123 radially arranged on the inner edge 1121 of the annular cover plate portion 112 are metal electrodes attached to the surface of the metal wire coil, and an insulating layer is arranged between the two to avoid conductive connection between the two.

[0068] In some embodiments, when the annular cover portion 112 is snapped with the annular main body portion 111, the portion of the snap protrusion 1123 extending out of the snap opening 1114 forms an outer wall fixing portion and an inner wall fixing portion, wherein the outer wall fixing portion is used to connect with the lens capsule 2, and the inner wall fixing portion is used to connect with the artificial muscle 12. In some embodiments, the inner wall fixing portion has different lengths and is used to connect control electrodes at different positions of the artificial muscle 12 (see below for details).

[0069] In some embodiments, the multiple snap-on protrusions 1123 radially arranged on the outer edge 1122 of the annular cover portion 112 are in the shape of a ring handle to facilitate suturing and fixation with the lens capsule 2; the multiple snap-on protrusions 1123 radially arranged on the inner edge 1121 of the annular cover portion 112 are in the shape of a sheet to facilitate conductive bonding with the control electrode of the artificial muscle 12.

[0070] In some embodiments, the artificial muscle 12 is set as an electro-induced artificial muscle, also known as an electrically driven artificial muscle or an electric artificial muscle, which refers to an artificial muscle that can bend and deform under the action of a control voltage. In this case, the electrically controlled bending direction of the artificial muscle 12 corresponds to the axial direction of the annular bracket 11. The "electrically controlled bending direction" mentioned here refers to the direction in which the artificial muscle is bent and deformed under the action of the control voltage. The artificial muscle 12 can swing back and forth under the action of the control voltage, driving the position of the liquid lens 13 relative to the axis of the cornea 7 to change, so that the focal length of the eyeball is changed. The wireless receiving coil 14 is electrically connected to the artificial muscle 12 and is used to apply a control voltage to the artificial muscle 12. In the utility model, by setting the artificial muscle 12 as an electro-induced artificial muscle, the bending deformation of the artificial muscle 12 can be changed by adjusting the control voltage of the artificial muscle 12, driving the liquid lens 13 to move closer to or away from the cornea 7, thereby achieving adjustable focal length. By adjusting the range and size of the control voltage on the artificial muscle 12, the bending direction and bending amplitude of the artificial muscle 12 can be accurately adjusted, thereby improving the accuracy of focal length adjustment. In addition, since the focal length can be selectively adjusted by adjusting the curvature of the lens surface of the liquid lens 13 and / or adjusting the bending deformation of the artificial muscle 12, the focal length adjustment range is further expanded. In practical applications, the focal length can be adjusted by adjusting the curvature of the lens surface of the liquid lens 13 or the bending deformation of the artificial muscle 12, or by adjusting the curvature of the lens surface of the liquid lens 13 and the bending deformation of the artificial muscle 12 at the same time.

[0071] In some embodiments, the artificial muscle 12 is configured as an artificial muscle made of ionic polymer-metal composites (IPMC), which is generally composed of an ion exchange membrane and metal electrodes (such as platinum and gold) attached to both sides of the ion exchange membrane. The ion exchange membrane presents a liquid-solid two-phase structure, and its interior is composed of a hydrophobic polymer grid and movable cations (such as Na ions) and solvents (water molecules). The working principle of IPMC as an electrogenic artificial muscle includes: Figure 6As shown, when voltage is applied to the metal electrodes on both sides of the ion exchange membrane, an electric field will be formed on both sides of the ion exchange membrane, so that the cations inside the ion exchange membrane move toward the cathode under the action of the electric field. At the same time, water molecules will also move toward the cathode under the action of cation migration, so that the concentration of water molecules and cations on the cathode side increases, and the concentration of water molecules and cations on the anode side decreases, thereby forming a concentration gradient difference, which causes the cathode side to expand and the anode side to shrink, resulting in the bending and deformation of the material as a whole. IPMC has the following advantages when used as artificial muscle: 1. Low driving voltage, it can work normally at a voltage of 4-7V; 2. IPMC is suitable for working in a humid environment; 3. It can produce a large displacement; 4. Fast reaction speed, between microseconds and seconds; 5. Compared with the "motor drive + mechanical transmission" mode composed of conventional materials, electro-induced artificial muscles do not require complex transmission mechanisms such as gears and bearings. Its "electricity + chemistry + drive" mode is more direct and effective, and has higher efficiency.

[0072] In some embodiments, the artificial muscle 12 is arranged in a ring shape, with its outer edge connected to the ring support 11 and its inner edge connected to the liquid lens 13. Designing the artificial muscle in a ring shape helps to form a stable support for the liquid lens 13, and its electric control range is larger, and it can provide a stronger bending traction force.

[0073] In some embodiments, Figure 7 As shown, the artificial muscle 12 includes a plurality of annular electrodes 121, which are arranged concentrically and spaced apart to control the bending amplitude of the artificial muscle 12. As mentioned above, the bending of the artificial muscle 12 is caused by the movement of ions within the electric field, and the ion concentrations within different ranges are controlled by arranging a plurality of groups of concentric electrodes at intervals. Figure 7 In the figure, the annular electrode 121 shown by the dotted line is the anode, and the annular electrode 121 shown by the solid line is the cathode. The anode is arranged on the side of the annular muscle close to the inner diameter, and multiple cathodes are arranged to diffuse outward in sequence, wherein the cathode and the anode are located on both sides of the annular muscle. During use, when different voltage signals are controlled to be applied to different combinations of cathodes and anodes, they will respectively control the cations and water molecules in the first electrically controlled bending area 122, the second electrically controlled bending area 123 or the third electrically controlled bending area 124 to move toward the cathode, thereby controlling the first electrically controlled bending area 122, the second electrically controlled bending area 123 or the third electrically controlled bending area 124 to bend and deform.

[0074] In some embodiments, in order to achieve precise control of the focal length, the parameters for controlling the bending amplitude of the artificial muscle 12 include, in addition to applying voltage signals to different combinations of cathodes and anodes, also controlling the magnitude of the voltage signals, and when the controlled ranges are different, the magnitude ranges of the voltage signals are also different. For example, for the first electrically controlled bending area 122, optionally, the control voltage range is 4-5V, for the second electrically controlled bending area 123, optionally, the control voltage range is 4-6V, and for the third electrically controlled bending area 124, optionally, the control voltage range is 4-7V.

[0075] In some other embodiments, the artificial muscle 12 is configured as a plurality of strip-shaped artificial muscles, one end of each strip-shaped artificial muscle is connected to the annular support 11 , and the other end is connected to the liquid lens 13 .

[0076] The liquid lens 13 uses liquid as a lens and changes the focal length by changing the curvature of the liquid. In some embodiments, the liquid lens 13 is a variable focus optical lens using the principle of electrowetting on dielectric (EWOD), also known as a liquid zoom lens.

[0077] Figure 8 An example structure of a liquid lens is given. The overall shape of the liquid lens 13 is like a cylinder. Figure 8 It is a side view, and its central axis is the horizontal direction in the figure. In the installed state, the liquid lens 13 is coaxially arranged with the annular bracket 11, that is, the central axis of the liquid lens 13 coincides with the central axis of the annular bracket 11. The liquid lens 13 includes a cylindrical container 131 containing liquid and a first circular glass sheet 132 and a second circular glass sheet 133 respectively located on the left and right sides of the container 131. Two liquids are filled in the cylindrical container 131, one of which is an electrolyte and the other is a non-electrolyte. In the embodiment shown, the electrolyte 134 is located on the left side of the cylindrical container 131, and the non-electrolyte 135 is located on the right side of the cylindrical container 131. Since the two liquids are immiscible, they will naturally form a clearly visible lens layer 136 at their contact surface, which has a converging effect on the light. The inner side wall of the cylindrical container 131 is divided into two layers: one layer is cylindrical and the other layer is truncated cone, and both layers are provided with metal electrodes, namely the first metal electrode 137 and the second metal electrode 138. A layer of insulating material 139 is applied between the two metal electrodes 137 and 138 to prevent electrical conduction between the two electrodes.

[0078] The zoom principle of the liquid lens 13 is as follows: since the electrolyte 134 and the non-electrolyte 135 are immiscible with each other, when no voltage is applied, the liquid interface naturally forms a symmetrical lens film under the interaction of surface tension, and the focal length of the liquid lens 13 is fixed at this time; when voltage is applied to the liquid lens 13, under the action of the electric field, the electric charge between the contact surfaces changes, thereby generating an external force that makes the original surface tension no longer balanced, and a new balance is reached under the action of the external force, thereby changing the curvature radius of the lens surface 136, and then changing the focal length of the liquid lens 13.

[0079] When the liquid lens 13 is used to replace the conventional convex lens as an optical device of the artificial lens, when looking at a nearby object, no voltage is applied, and the liquid interface naturally forms a symmetrical lens film under the interaction of surface tension. At this time, the radius of curvature of the lens is small and the focal length of the lens is short; when looking at a distant object, a voltage is applied to the lens, and under the action of the electric field, the electric charge between the contact surfaces changes, thereby generating an external force that makes the original surface tension no longer balanced, and a new balance is reached under the action of the external force, the radius of curvature of the lens becomes larger, and the focal length of the lens becomes longer. The surface tension required to achieve a steady state between the two liquids and between the liquid and the wall is different when the external voltage is different. By adjusting the external voltage to change the curvature of the liquid interface, and then changing the focal length of the liquid lens, objects at different distances can be seen clearly.

[0080] In some embodiments, the intraocular lens 1 based on the liquid lens further includes a control circuit disposed on the annular support 11 together with a wireless receiving coil 14. The wireless receiving coil 14 is electrically connected to the control circuit, and the control circuit is electrically connected to the liquid lens 13. The wireless receiving coil 14 is used to receive wireless power transmission, and modulates and outputs a stable external voltage signal through the control circuit, which is applied to the electrodes of the liquid lens 13 (for example, the metal electrodes 137 and 138 mentioned above).

[0081] In an embodiment where the artificial muscle 12 is configured as an electro-induced artificial muscle, the control circuit is also electrically connected to the artificial muscle 12, and the wireless induced power received by the wireless receiving coil 14 is modulated by the control circuit to output an external voltage signal, which is applied to the electrode of the artificial muscle 12 (for example, the annular electrode 121 mentioned above).

[0082] Since the wireless receiving coil 14 can only induce alternating current, the control circuit is also used to convert the alternating current into stable direct current. To this end, in some embodiments, the control circuit includes a rectifier circuit, which is electrically connected to the wireless receiving coil 14 and is used to convert the alternating current received by the wireless receiving coil 14 into direct current.

[0083] In addition, in some embodiments, the control circuit may also optionally include one or more of the following: a filtering subcircuit, the filtering subcircuit is used to filter the DC power output by the control circuit; a voltage stabilizing subcircuit, the voltage stabilizing subcircuit is used to stabilize the DC power output by the control circuit and output a stabilizing signal; a commutation power supply subcircuit, the commutation power supply subcircuit is used to control the polarity of the DC power output to the electrode. Specifically, the commutation power supply subcircuit is used to Figure 7 The positive and negative poles are exchanged in Figure 7 The positive and negative electrodes are essentially the same metal electrodes. In this application, the electrode applying a high potential is called an anode, and the electrode applying a low potential is called a cathode. Therefore, the commutation power supply subcircuit can control the polarity of the direct current output to the electrode by means of an inverted voltage signal or switching the output circuit. In some cases, the bending direction of the artificial muscle 12 can be reversed by the commutation power supply subcircuit, thereby achieving rapid adjustment of the focal length to improve the visual effect.

[0084] In a specific example, the control circuit includes: a filter subcircuit, which is connected to the rectifier subcircuit and is used to filter the direct current output by the rectifier subcircuit; a voltage stabilizing subcircuit, which is connected to the filter subcircuit and is used to stabilize the filtered direct current and output a stabilizing signal; a commutation power supply subcircuit, which is connected to the voltage stabilizing subcircuit and is used to control the polarity of the stabilizing signal output to the electrode. In an embodiment where the wireless receiving coil 14 is only used to power the liquid lens 13, the control circuit includes only a voltage stabilizing subcircuit and a commutation power supply subcircuit, and the commutation power supply subcircuit is connected to the electrode of the liquid lens 13 to provide an external voltage to the liquid lens 13. In the embodiment where the artificial muscle 12 is configured as an electro-induced artificial muscle and the wireless receiving coil 14 is used to power both the liquid lens 13 and the artificial muscle 12, the control circuit includes two voltage stabilizing subcircuits and two switching power supply subcircuits, wherein one voltage stabilizing subcircuits and one switching power supply subcircuits are connected to the electrodes of the liquid lens 13 for providing an external voltage to the liquid lens 13, and another voltage stabilizing subcircuits and another switching power supply subcircuits are connected to the electrodes of the artificial muscle 12 for providing a control voltage to the artificial muscle 12. This configuration facilitates separate control of the power supply to the liquid lens 13 and the artificial muscle 12, for example, providing different control voltages to the liquid lens 13 and the artificial muscle 12, respectively, as required.

[0085] In some embodiments, in order to achieve adaptive adjustment of focal length, the control circuit further includes: a bioelectric signal acquisition unit, which can be attached to the ciliary muscle surface of the ciliary body, for sensing the contraction change of the ciliary muscle and generating a control signal; a control chip, which is electrically connected to the bioelectric signal acquisition unit and the rectifier circuit respectively, for generating a corresponding PWM signal according to the control signal, and outputting the PWM signal to the control end of the rectifier circuit to control the rectifier circuit to output a corresponding amount of direct current. Specifically, the rectifier circuit can be a full rectifier bridge circuit, and the size of the rectifier output can be controlled by controlling the conduction time of the rectifier unit through the PWM signal. In addition, in the ciliary body of the eyeball, there are smooth muscles or striated muscles of the ciliary muscle used to adjust the curvature radius of the lens. Therefore, when the human eye needs to switch the far and near scenes of interest, it will generate corresponding bioelectric signals on the ciliary muscle of the striated muscle to cause the contraction of the striated muscle and / or the ciliary muscle, thereby adjusting the curvature radius of the lens. Therefore, the bioelectric signal on the ciliary muscle (including the striated ciliary muscle) can be collected and used as a basis for adjusting the focal length, that is, as a control signal for controlling the generation of the PWM signal, so as to adjust the duty cycle in the PWM signal.

[0086] In some embodiments, the bioelectric signal acquisition unit includes: a plurality of metal electrode contacts, which are respectively attached to different positions of the ciliary muscle to sense the bioelectric signal generated when the ciliary muscle contracts. The ciliary muscle includes striated muscle and ciliary muscle. The metal electrode contacts are respectively attached to the striated muscle and the ciliary muscle to respectively collect the bioelectric signals generated when the striated muscle and the ciliary muscle contract, and a PWM signal is generated according to the bioelectric signal with a larger intensity.

[0087] In some embodiments, the bioelectric signal acquisition unit includes: a thin film varistor, which is used to change resistance as the ciliary muscle contracts. Compared with collecting bioelectric signals, muscle contraction is easier to detect. The muscle contraction can be sensed by the thin film varistor and converted into resistance change, which is used to control the generation of the corresponding PWM signal.

[0088] In summary, the artificial lens based on the liquid lens provided by the utility model has a simple overall structure, an adjustable focal length, and a simple, easy-to-control and highly accurate focal length adjustment method.

[0089] The above are exemplary embodiments disclosed by the present utility model. The order disclosed in the above embodiments of the present utility model is only for description and does not represent the advantages and disadvantages of the embodiments. However, it should be noted that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope (including claims) disclosed in the embodiments of the present utility model is limited to these examples. Various changes and modifications may be made without departing from the scope defined in the claims. In addition, although the elements disclosed in the embodiments of the present utility model may be described or required in individual form, they may also be understood as multiple unless explicitly limited to the singular.

[0090] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. An intraocular lens based on a liquid lens, characterized in that: include: Ring bracket; an artificial muscle fixed to the inner side of the annular support; A liquid lens connected to the artificial muscle, wherein the liquid lens is arranged at the center of the annular support, and the focal length of the liquid lens can be changed by adjusting an applied voltage; A wireless receiving coil is arranged on the annular bracket, the wireless receiving coil is electrically connected to the liquid lens, and the wireless receiving coil is used to receive wireless induced power and apply an external voltage to the liquid lens.

2. The liquid lens-based intraocular lens according to claim 1, characterized in that: The liquid lens is cylindrical and is coaxially arranged with the annular support.

3. The liquid lens-based intraocular lens according to claim 1, characterized in that: The artificial muscle is an electrically induced artificial muscle, and its electrically controlled bending direction corresponds to the axial direction of the annular bracket. The wireless receiving coil is electrically connected to the artificial muscle and is used to apply a control voltage to the artificial muscle to adjust the distance between the liquid lens and the cornea along the axial direction of the eye axis.

4. The liquid lens-based intraocular lens according to claim 1 or 3, characterized in that: The artificial muscle is annular, with an outer edge connected to the annular support and an inner edge connected to the liquid lens.

5. The liquid lens-based intraocular lens according to claim 4, characterized in that: The artificial muscle comprises a plurality of annular electrodes, which are arranged concentrically and spaced apart to control the bending amplitude of the artificial muscle.

6. The liquid lens-based intraocular lens according to claim 1 or 3, characterized in that: The artificial muscle is a plurality of strip-shaped artificial muscles, one end of each strip-shaped artificial muscle is connected to the annular support, and the other end is connected to the liquid lens.

7. The liquid lens-based intraocular lens according to claim 1, characterized in that: The annular support forms an annular closed chamber, and the wireless receiving coil is accommodated in the closed chamber.

8. The liquid lens-based intraocular lens according to claim 7, characterized in that: The annular bracket includes an annular main body and an annular cover plate, the annular main body and the annular cover plate are connected to form the closed chamber, the cross-section of the annular main body is U-shaped, the annular main body includes an inner side wall located on the inner side and an outer side wall located on the outer side, a plurality of snap openings are respectively arranged on the inner side wall and the outer side wall, a plurality of snap protrusions are respectively arranged on the inner edge and the outer edge of the annular cover plate, the snap protrusions are used to snap into the snap openings.

9. The liquid lens-based intraocular lens according to claim 1 or 3, characterized in that: The artificial lens also includes a control circuit arranged on the annular bracket, the wireless receiving coil is electrically connected to the control circuit, the control circuit is electrically connected to the liquid lens or both the liquid lens and the artificial muscle, and the control circuit modulates the output of an external voltage signal based on the wireless induced electric energy received by the wireless receiving coil, and applies the signal to the electrode of the liquid lens or both the liquid lens and the artificial muscle.

10. The liquid lens-based intraocular lens according to claim 9, characterized in that: The control circuit comprises: a rectifier circuit, the rectifier circuit being connected to the wireless receiving coil and being used for converting the alternating current received by the wireless receiving coil into direct current; A bioelectric signal acquisition unit, which is attached to the ciliary muscle surface of the ciliary body and is used to sense the contraction changes of the ciliary muscle and generate a control signal; A control chip, the control chip is electrically connected to the bioelectric signal acquisition unit and the rectifier circuit respectively, and is used to generate a corresponding PWM signal according to the control signal, and output the PWM signal to the control end of the rectifier circuit to control the rectifier circuit to output a DC power of a corresponding magnitude, The control circuit may further include one or more of the following: A filter subcircuit, the filter subcircuit is used to filter the direct current output by the control circuit; A voltage stabilizing subcircuit, the voltage stabilizing subcircuit is used to stabilize the direct current output by the control circuit and output a stabilizing signal; The commutation power supply sub-circuit is used to control the polarity of the direct current output to the electrode.

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