Intraocular lens structure

Abstract

The utility model relates to the field of intraocular lenses, and provides an intraocular lens structure with an adjustable focal length, which comprises a support arranged in a lens capsular bag to support the lens capsular bag to form an adjusting space of an intraocular lens; the artificial muscle is arranged adjacent to the inner diameter of the stent, the first end of the artificial muscle is connected to the inner edge of the stent, and the artificial muscle is controllably and electrically bent towards the axial direction of the eye axis; and the biconvex lens is arranged at the central position of the bracket, is connected with the second end of the artificial muscle, is dragged by the artificial muscle, is suspended in the lens capsular bag, and is controllably dragged by the artificial muscle to move in the axial direction of the eye axis in the adjusting space. According to the utility model, the focal length adjustment is more accurate and simpler, and the accurate adjustment of the bending amplitude of the artificial muscle can be realized by adjusting the voltage application range and the voltage on the artificial muscle, so that the visual effect of a user is improved.

Description

Technical Field

[0001] The utility model relates to the field of artificial lenses, in particular to an artificial lens structure. 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 in severe cases, they can also cause blindness. 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 entering the eye 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 technologies have further proposed multifocal artificial lenses and variable optical power lenses. Among them, multifocal artificial lenses will form multiple imaging focal points in the eye, which requires the brain to "adapt", and patients will have problems such as glare, halo, or poor night vision; while variable optical power lenses change the focal length by changing the curvature of the lens used as the artificial lens, thereby changing the focal length. However, this method is difficult to achieve precise adjustment, and some solutions do not disclose specific adjustment methods. Therefore, a focal length adjustable artificial lens structure that can accurately adjust the focal length is urgently needed in this field. Utility Model Content

[0004] In order to achieve precise focal length adjustment of an artificial lens structure, the utility model proposes an artificial lens structure, comprising: a bracket, the bracket being arranged in a lens capsule to support the lens capsule to form an adjustment space for the artificial lens; an artificial muscle, the artificial muscle being arranged adjacent to the inner diameter of the bracket, the first end of the artificial muscle being connected to the inner edge of the bracket, and being controllably electrically bent toward the axial direction of the eye axis; a biconvex lens, the biconvex lens being arranged at the center of the bracket, the biconvex lens being connected to the second end of the artificial muscle as an artificial lens, and being suspended in the lens capsule by the traction of the artificial muscle, and being controllably moved in the adjustment space along the axial direction of the eye axis by the traction of the artificial muscle.

[0005] In one or more embodiments, the bracket is an annular bracket, which includes: an annular recessed portion, the cross-section of which is U-shaped; a snap-on opening, which is arranged around the inner and outer side walls of the annular recessed portion; and an annular cover plate, the inner and outer edges of the annular cover plate are radially provided with a plurality of snap-on protrusions for snapping with the plurality of snap-on openings on the inner and outer side walls of the annular recessed portion so that the annular cover plate and the annular recessed portion can be detachably formed into a closed cavity.

[0006] In one or more embodiments, when the annular cover plate is snapped into engagement with the annular recess, the portion of the snap protrusion extending out of the snap opening forms an outer wall fixing portion and an inner wall fixing portion, the outer wall fixing portion is used to connect to the lens capsule to fix the annular bracket, and the inner wall fixing portion is used to fix the artificial muscle.

[0007] In one or more embodiments, the artificial muscle includes a single layer of annular muscle or is composed of multiple layers of annular artificial muscles coaxially stacked. When it is composed of multiple layers of annular artificial muscles coaxially stacked, each layer of the annular artificial muscle is respectively connected to the inner edge of the annular support and the double convex lens.

[0008] In one or more embodiments, the artificial muscle further comprises: a plurality of annular electrodes, the plurality of annular electrodes being concentrically spaced and configured to control the bending amplitude of the artificial muscle;

[0009] When the artificial muscle is composed of multiple layers of annular artificial muscles coaxially stacked together, each layer of the annular artificial muscle is provided with multiple annular electrodes.

[0010] In one or more embodiments, the artificial lens structure of the utility model also includes: a wireless receiving coil and a control circuit embedded in the annular recess; wherein the wireless receiving coil is electrically connected to the control circuit, and the control circuit is electrically connected to the artificial muscle, and the wireless receiving coil is used to receive wireless power transmission, and the control circuit modulates the output of a stable voltage signal and applies it to the control electrode of the artificial muscle.

[0011] In one or more embodiments, the control circuit includes: a rectifier circuit, connected to the wireless receiving coil, for converting the alternating current received by the wireless receiving coil into direct current; a filter subcircuit, connected to the rectifier circuit, for filtering the direct current output by the rectifier circuit; a voltage stabilizing subcircuit, connected to the filter subcircuit, for stabilizing the filtered direct current and outputting a regulated voltage signal; a commutation power supply subcircuit, connected to the voltage stabilizing subcircuit, for controlling the switching of the polarity of the regulated voltage signal output to the control electrode end of the artificial muscle.

[0012] In one or more embodiments, the control circuit also includes: 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, which 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 direct current of corresponding magnitude.

[0013] In one or more embodiments, the bioelectric signal acquisition unit includes: a plurality of metal electrode contacts, wherein the plurality of metal electrode contacts are respectively attached to different positions of the ciliary muscle for sensing the bioelectric signal generated when the ciliary muscle contracts.

[0014] In one or more embodiments, the bioelectric signal acquisition unit includes: a thin film varistor, which is used to change its resistance value as the ciliary muscle contracts and deforms.

[0015] The beneficial effects of the utility model include: the utility model proposes an artificial lens structure that changes the focal length by changing the distance between the artificial lens and the cornea. Compared with the traditional method of changing the curvature of the artificial lens, the utility model can achieve precise adjustment of the focal length. Specifically, it can achieve precise adjustment of the bending amplitude of the artificial muscle by adjusting the voltage application range and voltage size on the artificial muscle, thereby improving the user's visual effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic structural diagram of an intraocular lens structure with adjustable focal length according to an embodiment of the utility model;

[0018] Figure 2 A front view of a bracket according to an embodiment of the utility model;

[0019] Figure 3 It is a partial cross-sectional view of the recessed portion of the annular bracket according to an embodiment of the utility model;

[0020] Figure 4 This is a schematic structural diagram of an annular cover plate according to an embodiment of the utility model;

[0021] Figure 5 A schematic diagram of the structure of an artificial muscle according to an embodiment of the utility model;

[0022] Figure 6 This is a schematic diagram of the working principle of the artificial muscle of an embodiment of the utility model.

[0023] The meanings of the various reference numerals in the above drawings are as follows: 10, bracket; 11, annular recess; 12, snap opening; 13, annular cover; 14, snap protrusion; 20, artificial muscle; 21, control electrode; 30, optical element; 40, wireless receiving coil. DETAILED DESCRIPTION

[0024] 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.

[0025] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0026] In order to achieve accurate adjustment of focal length, the utility model proposes an artificial lens structure, see Figure 1 (The left side is a side view of the eyeball, and the right side is a front view of the eyeball), including: a bracket 10, which is arranged in the lens capsule to support the lens capsule to form an adjustment space for the artificial lens; an artificial muscle 20, which is arranged adjacent to the inner diameter of the bracket 10, and the first end of the artificial muscle 20 is connected to the inner edge of the bracket 10, and can be electrically controlled to bend toward the axial direction of the eye axis; a biconvex lens 30, which is arranged at the center of the bracket 10, and the biconvex lens 30 is connected to the second end of the artificial muscle 20 as an artificial lens, and is suspended in the lens capsule by the traction of the artificial muscle 20, and can be controlled to move along the axial direction of the eye axis in the adjustment space by the traction of the artificial muscle 20. In addition, it should be noted that the focal length in this embodiment and the following embodiments refers to the focal length of the system formed by the artificial lens-optical element and the cornea.

[0027] Specifically, different from the traditional method of changing the focal length by changing the curvature of the artificial lens and then changing the focal length, this embodiment proposes a method of changing the focal length by changing the distance between the artificial lens and the cornea. Compared with the traditional focal length adjustment method, the focal length adjustment of this embodiment is more precise and easy to achieve precise adjustment.

[0028] In one embodiment, see Figure 2-4The bracket 10 is an annular bracket, which includes: an annular recessed portion 11, the cross section of which is U-shaped; a plurality of snap openings 12 arranged around the inner and outer walls of the annular recessed portion; and an annular cover plate 13, the inner and outer edges of which are radially provided with a plurality of snap protrusions 14, which are used to snap with the plurality of snap openings 12 on the inner and outer walls of the annular recessed portion so that the annular cover plate 13 and the annular recessed portion 11 can be detachably formed into a closed cavity. Among them, Figure 2 is a front view of the bracket; Figure 3 is a cross-sectional view of the concave portion; Figure 4 It is a structural schematic diagram of the annular cover.

[0029] Specifically, the support 10 is made of human tissue compatible materials, such as titanium alloy, platinum iridium alloy, etc. The function of the recessed portion 11 is to facilitate the installation of the wireless receiving coil 40 and the control circuit (not shown) embedded in the annular recessed portion 11; wherein the wireless receiving coil 40 is electrically connected to the control circuit, and the control circuit is electrically connected to the artificial muscle 20, and the wireless receiving coil 40 is used to receive wireless power transmission, and modulate the output of a stable voltage signal through the control circuit to be applied to the control electrode 21 of the artificial muscle 20 (see Figure 5 ).

[0030] In an optional embodiment, in order not to affect the wireless power transmission, the annular cover plate 13 is made of non-metallic materials compatible with human tissue, such as silicone. When in use, the side of the annular bracket with the annular cover plate 13 faces the wireless transmitting coil, so as to facilitate the electromagnetic field to pass through the annular cover plate 13 and induce alternating current on the wireless receiving coil inside the recessed portion 11; on this basis, the multiple snap-on protrusions 14 radially arranged on the inner edge of the annular cover plate 13 are metal electrodes embedded in the silicone plate, one end of which extends from the thickness edge of the annular cover plate 13, and the other end extends from the inner surface of the annular cover plate 13 and is electrically connected to the control circuit arranged in the recessed portion, and is used to output a voltage-stabilized signal to the artificial muscle.

[0031] In another optional embodiment, the annular cover plate 13 is directly used as a wireless receiving coil. Specifically, the annular cover plate in this embodiment is made of a metal wire (such as a platinum-iridium alloy wire) coil; on this basis, the multiple buckle protrusions 14 radially arranged on the inner edge of the annular cover plate 13 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.

[0032] In the above embodiment, the annular cover plate is used to cooperate with the recessed portion to form a closed cavity, thereby ensuring protection of the control circuit.

[0033] In one embodiment, when the annular cover plate is snapped into engagement with the annular recess, the portion of the snap protrusion extending out of the snap opening forms an outer wall fixing portion and an inner wall fixing portion, the outer wall fixing portion is used to connect to the lens capsule to fix the annular bracket, and the inner wall fixing portion is used to fix the artificial muscle.

[0034] In an optional embodiment, a plurality of snap-on protrusions in the shape of ring handles are radially arranged on the outer edge of the annular cover plate to facilitate suturing and fixation with the ciliary muscle; a plurality of snap-on protrusions in the shape of sheets are radially arranged on the inner edge of the annular cover plate to facilitate conductive bonding with the control electrodes of the artificial muscle, wherein the inner wall fixing portions have different lengths and are used to connect the control electrodes at different positions of the artificial muscle (please refer to the following embodiments for details).

[0035] In one embodiment, it includes a single layer of annular muscle or is composed of multiple layers of annular artificial muscles coaxially stacked. When it is composed of multiple layers of annular artificial muscles coaxially stacked, each layer of annular artificial muscle is respectively connected to the inner edge of the annular support and the optical element.

[0036] For details, see Figure 6The artificial muscle in this embodiment is made of ionic polymer-metal composites (IPMC), which is usually composed of an ion exchange membrane and precious metal electrodes (such as platinum and gold) attached to the upper and lower surfaces 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 a solvent (water molecules); the working principle of IPMC as an electro-induced artificial muscle includes: when a voltage is applied to the metal electrodes on the upper and lower surfaces of the ion exchange membrane, it will form an electric field 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, and at the same time, the water molecules will also move toward the cathode under the action of the cation migration, so that the water molecule concentration and cation concentration on the cathode side increase, and the water molecule concentration and cation concentration on the anode side decrease, thereby forming a concentration gradient difference, thereby causing the cathode side to expand and the anode side to shrink, thereby causing the overall bending and deformation of the material. In this embodiment, the artificial muscle is designed to be ring-shaped, and a ring electrode is used to control the bending of the artificial muscle, which can generate uniform pulling force in all directions, help to form a stable support for the optical element, and ensure that the optical element does not deviate from the eye axis, and the larger electrical control range can provide stronger bending traction. IPMC has the following advantages when used as artificial muscle: 1. The driving voltage is low, and 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. The reaction speed is fast, between microseconds and seconds; 5. Compared with the "motor drive + mechanical transmission" mode composed of conventional materials, the electro-induced artificial muscle does not require complex transmission mechanisms such as gears and bearings. Its "electricity + chemistry + drive" mode is more direct and effective, and has higher efficiency.

[0037] More specifically, the purpose of providing multiple layers of artificial muscles in this embodiment is to reduce the thickness of each layer of artificial muscles relative to single-layer artificial muscles, thereby reducing the requirements for control voltage (such as using a lower control voltage), and thinner artificial muscles can reduce the movement distance of ions, thereby helping to improve the sensitivity of artificial muscles, and thinner artificial muscles also help to increase the bending amplitude.

[0038] In an optional embodiment, control signals can be applied to the multi-layer annular artificial muscle as needed. For example, when the artificial muscle is composed of three layers of annular artificial muscles, when it is necessary to control the increase of the focal length, the layer of annular artificial muscle closest to the cornea is controlled to bend toward the cornea; when it is necessary to reduce the focal length, the layer of annular artificial muscle farthest from the cornea is controlled to bend away from the cornea, and the annular artificial muscle located in the middle layer is used to control the repositioning of the artificial lens.

[0039] In another optional embodiment, when one layer of circular artificial muscle cannot reach the required bending amplitude, two or three layers of circular artificial muscles are controlled to bend toward the same side.

[0040] In one embodiment, see Figure 5 The artificial muscle includes a plurality of annular electrodes, which are concentrically arranged at intervals to control the bending amplitude of the artificial muscle; when the artificial muscle is composed of multiple layers of coaxially stacked annular artificial muscles, each layer of the annular artificial muscle is provided with a plurality of annular electrodes.

[0041] Specifically, it can be seen from the above embodiments that the bending of the artificial muscle is caused by the movement of ions within the electric field; on this basis, this embodiment arranges multiple groups of concentric electrodes at intervals to control the ion concentration within different ranges. Figure 5 , the annular anode is arranged on the side of the annular muscle close to the inner diameter, and multiple annular cathodes are arranged in sequence to spread outward, wherein the cathode and the anode are located on both sides of the annular muscle, and the anode is represented by a dotted line. 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 electrically controlled bending area 1, 2 or 3 to move toward the cathode, thereby controlling the bending of the electrically controlled bending area 1, 2 or 3.

[0042] In an optional embodiment, in order to achieve precise control of the focal length, the parameters for controlling the bending amplitude of the artificial muscle include, in addition to applying voltage signals to different anode and cathode combinations, controlling the size of the voltage signal, and when the controlled range is different, the size range of the voltage signal is also different; for example, for the electrically-controlled bending area 1, optionally, the control voltage range is 4-5V, for the electrically-controlled bending area 2, optionally, the control voltage range is 4-6V, and for the electrically-controlled bending area 3, optionally, the control voltage range is 4-7V.

[0043] In an optional embodiment, the contact surfaces of the multiple layers of artificial muscles are arranged in close contact with each other, that is, the multiple layers of artificial muscles can share the same electrode; for example, when the artificial muscle is composed of three layers of coaxially stacked annular artificial muscles, multiple annular electrodes can be shared between the first layer and the second layer, and similarly, multiple annular electrodes can be shared between the second layer and the third layer.

[0044] In another optional embodiment, multiple layers of artificial muscles are spaced apart from each other; the spacing helps to reduce obstruction between the multiple layers of artificial muscles during bending.

[0045] In one embodiment, the artificial lens structure of the utility model also includes a wireless receiving coil and a control circuit embedded in the annular recess; wherein the wireless receiving coil is electrically connected to the control circuit, the control circuit is electrically connected to the artificial muscle, the wireless receiving coil is used to receive wireless power transmission, and the control circuit modulates the output of a stable voltage signal and applies it to the control electrode of the artificial muscle (i.e., the annular electrode in the aforementioned example).

[0046] Specifically, this embodiment uses a wireless receiving coil as a power supply to realize a passive design of the internal circuit to ensure the safety of human eyes. However, since the wireless receiving coil can only induce alternating current, in the following embodiments, the utility model also designs a control circuit for converting alternating current into stable direct current.

[0047] In one embodiment, the control circuit of the utility model includes a rectifier circuit, which is connected to the wireless receiving coil and is used to convert the alternating current received by the wireless receiving coil into direct current; a filtering subcircuit, which is connected to the rectifier circuit and is used to filter the direct current output by the rectifier circuit; a voltage stabilizing subcircuit, which is connected to the filtering subcircuit and is used to stabilize the filtered direct current and output a stabilizing signal; and a commutation power supply subcircuit, which is connected to the voltage stabilizing subcircuit and is used to control the polarity of the switching stabilizing signal output to the control electrode end of the artificial muscle.

[0048] Specifically, the commutation power supply circuit is used to Figure 5 The positive and negative poles are exchanged in Figure 5 The positive and negative electrodes are essentially the same metal electrodes. In this application, the electrode applying high potential is called the anode, and the electrode applying low potential is called the cathode. Therefore, the switching power supply subcircuit can control the polarity of the switching regulated voltage signal output to the control electrode end of the artificial muscle by means of an inverted voltage signal or a switching output circuit. The purpose of this embodiment is to reversely adjust the bending direction of the artificial muscle, thereby achieving rapid adjustment of the focal length to improve the visual effect.

[0049] In one embodiment, in order to achieve adaptive adjustability, the control circuit of this embodiment also includes: 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, which 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.

[0050] Specifically, the rectifier circuit can be a full rectifier bridge circuit, and the magnitude of the rectifier output can be controlled by controlling the on-time of the rectifier unit through a PWM signal. More specifically, in this embodiment, the input voltage of the voltage stabilizing circuit is changed by adjusting the output voltage of the rectifier circuit, thereby changing the output voltage of the voltage stabilizing circuit, thereby achieving the purpose of adjustable control signal.

[0051] In addition, in the ciliary body of the eyeball, there are smooth muscles or striated muscles of the ciliary muscle used to adjust the radius of curvature of the lens. Therefore, when the human eye needs to switch the focus of the near and far scenes, the ciliary muscle of the striated muscle will generate corresponding bioelectric signals to cause the contraction of the striated muscle and / or the ciliary muscle, thereby adjusting the radius of curvature of the lens. Therefore, this embodiment proposes that the bioelectric signal on the ciliary muscle (including the ciliary muscle of the striated muscle) can be collected as a basis for adjusting the distance from the optical element to the cornea, 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. Among them, the more specific PWM signal generation process includes:

[0052] 1) Collect a large number of electrical signals on the eye muscles of normal people when they observe objects at different distances and nearness, and obtain data samples;

[0053] 2) marking the data samples according to their corresponding observation distances;

[0054] 3) constructing a neural network prediction model for predicting the observation distance based on the input electrical signal;

[0055] 4) Use sample data to iteratively train the neural network prediction model and verify the prediction results;

[0056] 5) Responding to the validation by outputting the neural network prediction model.

[0057] 6) Measure multiple sets of correlation data between control voltage and artificial muscle bending amplitude by experimental means, and perform curve fitting based on multiple sets of correlation data to obtain a fitting curve of control voltage-artificial muscle bending amplitude, and further calculate to obtain a fitting curve of control voltage-observation distance;

[0058] 7) Collecting the electrical signals from the user's eye muscles and inputting them into the above-mentioned neural network prediction model to obtain the predicted observation distance;

[0059] 8) Determine the control voltage based on the predicted observation distance and the control voltage-observation distance fitting curve, and then determine the duty cycle of the PWM signal, and generate a PWM signal.

[0060] In an optional embodiment, the bioelectric signal acquisition unit includes: a plurality of metal electrode contacts, wherein the plurality of metal electrode contacts are respectively attached to different positions of the ciliary muscle for sensing the bioelectric signal generated when the ciliary muscle contracts.

[0061] Specifically, the ciliary muscle in this embodiment includes the striated ciliary muscle. In an optional embodiment, metal electrode contacts are attached to the striated muscle and the ciliary muscle to respectively collect 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.

[0062] In another optional embodiment, the bioelectric signal acquisition unit includes: a thin film varistor, which is used to change its resistance value as the ciliary muscle contracts and deforms.

[0063] Specifically, compared with collecting bioelectric signals, muscle contraction is easier to detect. This embodiment senses muscle contraction through thin film varistors and converts the muscle contraction into resistance changes, which are then used to control the generation of corresponding PWM signals.

[0064] In one embodiment, the optical element of the utility model includes but is not limited to a convex lens, a biconvex lens and a liquid lens, wherein the liquid lens uses liquid as a lens to change the focal length by changing the curvature of the liquid. Currently, the more mature liquid lens is a variable-focus optical lens that uses the principle of electrowetting on dielectric (EWOD), which can change the shape of the droplet by applying an external voltage, thereby changing its focal length, and can achieve automatic focusing without the need for mechanical components.

[0065] Through the above embodiments, the utility model proposes an artificial lens structure that changes the focal length by changing the distance between the artificial lens and the cornea. Compared with the traditional method of changing the curvature of the artificial lens, the focal length adjustment of the utility model is more precise. Specifically, it is possible to accurately adjust the bending amplitude of the artificial muscle by adjusting the voltage application range and voltage size on the artificial muscle, thereby achieving precise adjustment of the focal length, thereby improving the user's visual effect.

[0066] The above are exemplary embodiments disclosed by the present utility model, but it should be noted that various changes and modifications can be made without departing from the scope of the present utility model disclosed by the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order.

[0067] It should be understood that, as used herein, the singular forms "a", "an" are intended to include the plural forms as well, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" refers to any and all possible combinations including one or more of the associated listed items.

[0068] The serial numbers of the embodiments disclosed in the above-mentioned embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0069] 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 utility model (including the claims) is limited to these examples; under the idea of ​​the embodiments of the utility model, 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 above embodiments of the utility model, 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 utility model should be included in the protection scope of the embodiments of the utility model.

Claims

1. An artificial lens structure, characterized in that: include: A support, the support being arranged in the lens capsule to support the lens capsule to form an adjustment space for the artificial lens; An artificial muscle, wherein the artificial muscle is disposed adjacent to the inner diameter of the support, wherein a first end of the artificial muscle is connected to an inner edge of the support and can be electrically controlled to bend toward the axial direction of the eye axis; A biconvex lens is arranged at the center of the bracket, the biconvex lens is connected to the second end of the artificial muscle, and is suspended in the lens capsule by the traction of the artificial muscle, and can be controllably moved along the axial direction of the eye axis in the adjustment space by the traction of the artificial muscle.

2. The intraocular lens structure according to claim 1, characterized in that: The bracket is an annular bracket, and the annular bracket comprises: An annular recessed portion, wherein the cross section of the annular recessed portion is U-shaped; A buckle opening, the buckle opening being arranged around the inner and outer side walls of the annular recess; An annular cover plate, wherein the inner and outer edges of the annular cover plate are radially provided with a plurality of snap protrusions for snapping with a plurality of snap openings on the inner and outer side walls of the annular recessed portion so that the annular cover plate and the annular recessed portion can be detachably formed into a closed cavity.

3. The intraocular lens structure according to claim 2, characterized in that: When the annular cover plate is snapped into engagement with the annular recessed portion, the portion of the snap protrusion extending out of the snap opening forms an outer wall fixing portion and an inner wall fixing portion, the outer wall fixing portion being used to connect to the lens capsule to fix the annular bracket, and the inner wall fixing portion being used to fix the artificial muscle.

4. The intraocular lens structure according to claim 1, characterized in that: The artificial muscle comprises a single layer of annular muscle or is composed of multiple layers of annular artificial muscles coaxially stacked. When composed of multiple layers of annular artificial muscles coaxially stacked, each layer of the annular artificial muscle is respectively connected to the inner edge of the annular support and the double convex lens.

5. The intraocular lens structure according to claim 4, characterized in that: The artificial muscle further comprises: a plurality of annular electrodes, the plurality of annular electrodes being arranged concentrically and spaced apart to control the bending amplitude of the artificial muscle; When the artificial muscle is composed of multiple layers of annular artificial muscles coaxially stacked together, each layer of the annular artificial muscle is provided with multiple annular electrodes.

6. The intraocular lens structure according to claim 2, characterized in that: Also includes: A wireless receiving coil and a control circuit embedded in the annular recess; The wireless receiving coil is electrically connected to the control circuit, which is electrically connected to the artificial muscle. The wireless receiving coil is used to receive wireless power transmission and modulate the control circuit to output a stable voltage signal which is applied to the control electrode of the artificial muscle.

7. The intraocular lens structure according to claim 6, characterized in that: The control circuit comprises: a rectifier circuit, connected to the wireless receiving coil, and used for converting the alternating current received by the wireless receiving coil into direct current; A filter subcircuit, connected to the rectifier subcircuit, for filtering the direct current output by the rectifier subcircuit; A voltage stabilizing subcircuit, connected to the filtering subcircuit, for stabilizing the filtered direct current and outputting a stabilizing signal; The commutation power supply sub-circuit is connected to the voltage stabilizing sub-circuit and is used to control the switching of the polarity of the voltage stabilizing signal output to the control electrode end of the artificial muscle.

8. The intraocular lens structure according to claim 7, characterized in that: The control circuit further comprises: The bioelectric signal acquisition unit 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; 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.

9. The intraocular lens structure according to claim 8, characterized in that: The bioelectric signal acquisition unit comprises: A plurality of metal electrode contacts are respectively attached to different positions of the ciliary muscle and are used to sense the bioelectrical signals generated when the ciliary muscle contracts.

10. The intraocular lens structure according to claim 8, characterized in that: The bioelectric signal acquisition unit comprises: Thin-film varistor, used to change resistance by deforming as the ciliary muscle contracts.

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