Device and method for polishing artificial lens using electrorheological effect

Abstract

The present invention discloses a device for polishing an intraocular lens using electrorheological effect, comprising a rotating tool, the rotating tool comprising a support plate, a motor, a conductive slip ring, an outer sleeve, a tool shaft, a connecting flange, an annular electrode and a tool needle, the motor, the outer ring of the conductive slip ring and the outer sleeve are all mounted on the support plate, the motor drives the tool shaft to rotate through a transmission assembly, one end of the tool shaft is tightly matched with the inner ring of the conductive slip ring, the other end of the tool shaft extends into the outer sleeve, the connecting flange is mounted on the outer sleeve, the annular electrode is connected to the connecting flange, one end of the tool needle is connected to the tool shaft, and the other end of the tool needle extends out of the annular electrode. The present invention also discloses a method for polishing an intraocular lens using electrorheological effect. The present invention has a good insulation effect, the tool needle as a cathode and the annular electrode as an anode can be disassembled and adjusted to meet different polishing requirements, making it possible to perform deterministic polishing of high-quality aspheric intraocular lenses.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-precision polishing, and in particular to a device and method for polishing an artificial lens by utilizing electrorheological effect. Background Art

[0002] Intraocular lens (IOL) is an artificial lens implanted in the eye to replace the natural lens. It consists of a circular optical part and a support loop, and is mostly made of acrylic. The diameter of the optical part is generally around 5.5-6mm. Cataract surgery has gone through needle extraction, intracapsular cataract extraction, extracapsular cataract extraction, and small-incision extracapsular cataract extraction. It has developed into the widely used cataract phacoemulsification and intraocular lens implantation today, which is inseparable from the research and development and application of intraocular lenses.

[0003] At present, most artificial lenses are made of acrylic, which has low rigidity and a product qualification rate of only 30% or less, which has become an internationally recognized problem in artificial lens processing technology. The manufacturing methods of artificial lenses mainly include injection molding and turning, but their surface roughness and optical properties are mainly obtained by polishing their optical surfaces. However, since the material of artificial lenses is very soft, existing polishing methods (such as finger polishing and mechanical contact polishing) have knife marks and over-polishing caused by poor polishing conditions, which seriously affect the optical properties and production efficiency of artificial lenses.

[0004] Electrorheological polishing is a precision machining technology and a new polishing method based on the electrorheological effect. Electrorheological fluid is composed of solid particles with high dielectric constant (dispersed phase), liquid with good insulation performance (continuous phase) and polishing abrasive particles. Its viscosity under the action of high-voltage electric field increases with the increase of electric field strength, and it shows obvious shear yield resistance. This phenomenon of rapid and reversible changes in electrorheological fluid under the action of electric field is usually called electrorheological effect.

[0005] The existing electrorheological polishing equipment has the problems of being mostly used for fixed-point polishing and having imperfect insulation measures. Therefore, considering the problem that intraocular lenses are difficult to polish, it is urgent to provide a device and method for polishing intraocular lenses using electrorheological effect. Summary of the invention

[0006] In view of the shortcomings of the prior art, the object of the present invention is to provide a device and method for polishing an intraocular lens using the electrorheological effect with high polishing efficiency and good safety performance.

[0007] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows:

[0008] A device for polishing an intraocular lens using electrorheological effect comprises a rotating tool, wherein the rotating tool comprises a supporting plate, a motor, a conductive slip ring, an outer sleeve, a tool shaft, a connecting flange, an annular electrode and a tool needle, wherein the motor, the outer ring of the conductive slip ring and the outer sleeve are all mounted on the supporting plate, the motor drives the tool shaft to rotate through a transmission assembly, one end of the tool shaft is tightly matched with the inner ring of the conductive slip ring, the other end of the tool shaft extends into the outer sleeve, the connecting flange is mounted on the outer sleeve, the annular electrode is connected to the connecting flange, one end of the tool needle is connected to the tool shaft, and the other end of the tool needle extends out of the annular electrode.

[0009] As a further improvement of the present invention, the annular electrode is connected to the positive electrode of the high-voltage DC power supply, and the conductive slip ring is connected to the negative electrode of the high-voltage DC power supply.

[0010] As a further improvement of the present invention, the transmission assembly includes a first synchronous pulley, a second synchronous pulley and a synchronous belt connecting the first synchronous pulley and the second synchronous pulley, the first synchronous pulley is installed on the output shaft of the motor, and the second synchronous pulley is installed on the tool shaft.

[0011] As a further improvement of the present invention, a retaining ring is installed in the outer sleeve, a first step is provided on the tool shaft, a deep groove ball bearing is installed on the tool shaft, and two axial ends of the deep groove ball bearing are respectively abutted against the retaining ring and the first step.

[0012] As a further improvement of the present invention, a second step is provided on the tool shaft, a pair of angular contact bearings are installed on the tool shaft, and a locking nut is threadedly connected to the other end of the tool shaft.

[0013] As a further improvement of the present invention, the annular electrode is provided with a central through hole along the axial direction, and the gap between the hole wall of the central through hole and the outer wall of the tool needle is 1-2 mm.

[0014] As a further improvement of the present invention, one end of the tool needle passes through the central through hole and is threadedly connected to the tool shaft.

[0015] As a further improvement of the present invention, the outer wall of the annular electrode is threadedly connected to the inner wall of the connecting flange.

[0016] As a further improvement of the present invention, a liquid nitrogen cooling system is further provided, and the liquid nitrogen cooling system is used to cool the artificial lens.

[0017] A method for polishing an intraocular lens using electrorheological effect, using the device, comprises the following steps:

[0018] (1) Positioning the intraocular lens in the processing tank, pouring a pre-configured electrorheological fluid into the processing tank, and adjusting the rotating tool so that there is a gap between the other end of the tool needle and the intraocular lens, and the other end of the tool needle is immersed in the electrorheological fluid;

[0019] (2) using a liquid nitrogen cooling system to spray liquid nitrogen onto the intraocular lens;

[0020] (3) Turn on the high voltage DC power supply and adjust the voltage to 1500-3000V;

[0021] (4) Start the motor and adjust the speed of the tool needle to 1500-3000 r / min, while making the rotating tool reciprocate along the Y-axis direction;

[0022] (5) After polishing is completed, turn off the high-voltage DC power supply and the motor, stop the tool needle from moving, and remove the intraocular lens.

[0023] The beneficial effects of the present invention are:

[0024] (1) The electrorheological effect-based device of the present invention can achieve a micro-removal of the surface material of the intraocular lens in accordance with a set movement mode in combination with a multi-degree-of-freedom CNC machine tool, thereby achieving a polishing effect.

[0025] (2) The tool needle used as the cathode and the annular electrode used as the anode are both detachable and adjustable. By adjusting the gap between the cathode and the anode, the diameter of the tool needle, the thickness of the annular electrode, and the length of the other end of the tool needle extending out of the annular electrode, different polishing requirements can be met. The tool needle has a wide range of applications, improves polishing efficiency, and reduces production costs.

[0026] (3) The device adopts a separate structure and uses a synchronous belt to transmit power, isolating the input and output. High voltage electricity will not be transmitted to the motor and CNC machine tools, and the entire device has a good insulation effect.

[0027] (4) The problem of wire winding caused by rotation can be solved by setting a conductive slip ring.

[0028] (5) The device of the present invention has a compact structure and a convenient electric field application method, and can be used to polish both conductive workpieces and non-conductive workpieces.

[0029] (6) The present invention proposes a new method for polishing an intraocular lens using the electrorheological effect, which is intended to achieve ultra-precision polishing of aspheric intraocular lenses, making it possible to perform deterministic polishing of high-quality aspheric intraocular lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention 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 described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of a preferred embodiment of the present invention;

[0032] Figure 2 for Figure 1 A is an enlarged schematic diagram;

[0033] Figure 3 It is a structural schematic diagram of a rotary tool according to a preferred embodiment of the present invention;

[0034] Figure 4 A cross-sectional view of a rotary tool according to a preferred embodiment of the present invention;

[0035] Figure 5 FIG. 2 is a diagram of a flexible polishing head formed during polishing according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0037] like Figure 1-Figure 4 As shown, a device for polishing an intraocular lens 10 using electrorheological effect includes a rotating tool 12, and the rotating tool 12 includes a supporting plate 14, a motor 16, a conductive slip ring 18, an outer sleeve 20, a tool shaft 22, a connecting flange 24, an annular electrode 26 and a tool needle 28. The motor 16, the outer ring of the conductive slip ring 18 and the outer sleeve 20 are all installed on the supporting plate 14. The motor 16 drives the tool shaft 22 to rotate through a transmission component. One end of the tool shaft 22 is tightly matched with the inner ring of the conductive slip ring 18. The inner ring of the conductive slip ring 18 can rotate together with the tool shaft 22 and can transmit electricity on the conductive slip ring 18 to the tool shaft 22. The other end of the tool shaft 22 extends into the outer sleeve 20. The connecting flange 24 is installed on the outer sleeve 20. The annular electrode 26 is connected to the connecting flange 24. One end of the tool needle 28 is connected to the tool shaft 22, and the other end of the tool needle 28 extends out of the annular electrode 26.

[0038] In the embodiment of the present invention, the annular electrode 26 is connected to the positive electrode of the high-voltage DC power supply 30 , and the conductive slip ring 18 is connected to the negative electrode of the high-voltage DC power supply 30 .

[0039] The preferred transmission assembly of the present invention includes a first synchronous pulley 32, a second synchronous pulley 34, and a synchronous belt 36 connecting the first synchronous pulley 32 and the second synchronous pulley 34. The first synchronous pulley 32 is mounted on the output shaft 38 of the motor 16, and the second synchronous pulley 34 is mounted on the tool shaft 22. To ensure the synchronous movement of the first synchronous pulley 32 and the second synchronous pulley 34, the present invention preferably has the end face of the first synchronous pulley 32 and the end face of the second synchronous pulley 34 parallel to each other.

[0040] In order to facilitate the adjustment of the tension of the synchronous belt 36, the present invention preferably has a movable slide 39 installed on the support plate 14, the motor 16 is installed on the movable slide 39, and the output shaft 38 of the motor 16 passes through the movable slide 39 and the support plate 14. The movement of the movable slide 39 drives the motor 16 to move, thereby adjusting the synchronous belt 36. Further, a stopper 40 is installed on the support plate 14, and an adjustment screw 42 is screwed out of the stopper 40 and screwed into the movable slide 39. Since the stopper 40 is fixed on the support plate 14 and does not move, rotating the adjustment screw 42 drives the movable slide 39 to move. In this embodiment, it is preferred that the stopper 40 is threadedly connected to the support plate 14 through a locking screw 43, and the stopper 40 and the support plate 14 are configured as a split connection to save materials, but it is not limited to this method, and the stopper 40 and the support plate 14 can also be made into one piece.

[0041] In the embodiment of the present invention, the outer ring of the conductive slip ring 18 is fixed to the support plate 14 by a first bolt 44 , a first nut 46 , a second bolt 48 , and a second nut 50 . Meanwhile, the second bolt 48 also passes through the outer sleeve 20 to fix the outer sleeve 20 to the support plate 14 .

[0042] In the present invention, a retaining ring 52 is preferably installed in the outer sleeve 20, a first step 54 is provided on the tool shaft 22, and a deep groove ball bearing 56 is installed on the tool shaft 22. The two axial ends of the deep groove ball bearing 56 are respectively abutted against the retaining ring 52 and the first step 54. The deep groove ball bearing 56 improves the verticality of the tool shaft 22, thereby ensuring that the coaxiality of the tool needle 28 and the annular electrode 26 is consistent.

[0043] In order to further improve the coaxiality of the tool needle 28 and the annular electrode 26, the present invention preferably provides a second step 58 on the tool shaft 22, and a pair of angular contact bearings 60 are installed on the tool shaft 22. The other end of the tool shaft 22 is threadedly connected with a locking nut 62. The pair of angular contact bearings 60 are positioned by cooperating with the second step 58 and the locking nut 62. The arrangement of the angular contact bearings 60 can improve the verticality of the tool shaft 22.

[0044] The present invention preferably provides a central through hole 64 in the annular electrode 26 along the axial direction, and the gap between the hole wall of the central through hole 64 and the outer wall of the tool needle 28 is 1-2 mm. It is further preferred that the gap between the hole wall of the central through hole 64 and the outer wall of the tool needle 28 is 1.5 mm. One end of the tool needle 28 passes through the central through hole 64 and is threadedly connected to the tool shaft 22. The tool needle 28 and the tool shaft 22 are detachably connected, so that it is convenient to replace tool needles 28 of different diameters, and it is convenient to adjust the gap between the outer wall of the tool needle 28 and the central through hole 64. At the same time, the length of the tool needle 28 extending out of the annular electrode 26 can be adjusted, which is convenient for adapting to different processing requirements and has a wide range of applications. Specifically, a screw 65 is fixed to one end of the tool needle 28, and the screw 65 is threadedly connected to the tool shaft 22.

[0045] The present invention preferably has the outer wall of the annular electrode 26 threadedly connected to the inner wall of the connecting flange 24. The annular electrode 26 can be removed from the connecting flange 24 and replaced with annular electrodes of different thicknesses, thereby being able to adjust the gap between the hole wall of the central through hole 64 of the annular electrode 26 and the outer wall of the tool needle 28, which is convenient for adapting to different processing requirements and has a wide range of applications.

[0046] like Figure 1 As shown, a liquid nitrogen cooling system 66 is also provided. The liquid nitrogen cooling system 66 adopts conventional technology, which will not be described in detail here. The liquid nitrogen cooling system 66 is used to cool the intraocular lens 10, and provides a low-temperature cooling field for the intraocular lens 10 before and during polishing, so that the intraocular lens 10 has better rigidity and hardness, and improves the polishing quality. Specifically, the liquid nitrogen cooling system 66 is connected to a liquid nitrogen tank 68 and a nozzle 70, respectively. The liquid nitrogen in the liquid nitrogen tank 68 is cooled by the liquid nitrogen cooling system 66, and then the liquid nitrogen is sprayed on the intraocular lens 10 through the nozzle 70.

[0047] In the present invention, the tool shaft 22, the annular electrode 26 and the tool needle 28 are preferably made of martensitic stainless steel.

[0048] In the present invention, the outer sleeve 20 and the connecting flange 24 are preferably made of nylon to further improve the insulation of the entire device.

[0049] Preferably, the other end of the tool needle 28 is a needle-shaped tip, which facilitates the polishing of a smaller intraocular lens and improves the polishing quality.

[0050] Since the length of the tool needle 28 extending out of the annular electrode 26 can be adjusted, that is, the distance between the needle tip of the tool needle 28 and the surface of the artificial lens 10 can be adjusted, and since the distance will affect the electric field strength, the closer the surface of the artificial lens 10 is to the needle tip of the tool needle 28, the greater the electric field strength, the more obvious the electrorheological effect is, and the stronger the shear yield capacity of the electrorheological fluid 82 is, different polishing requirements can be achieved, and the polishing efficiency and polishing quality can be improved.

[0051] The method of the present invention is described below, a method for polishing an intraocular lens using the electrorheological effect, using the above-mentioned device, comprising the following steps:

[0052] (1) Position the intraocular lens 10 in the processing tank 80, pour the pre-configured electrorheological fluid 82 into the processing tank 80, adjust the rotating tool 12 so that there is a gap between the other end of the tool needle 28 and the intraocular lens 10, and the other end of the tool needle 28 is immersed in the electrorheological fluid 82. As a preferred solution, a clamp 84 is set in the processing tank 80 to position the intraocular lens 10. In this embodiment, the clamp 84 is a suction cup, but it is not limited to a suction cup, and can also be an air source adsorption or a vacuum generator. The surface of the intraocular lens is a non-spherical convex shape. The CNC machine tool is adjusted so that the gap between the other end of the tool needle 28 and the highest point of the convex surface of the intraocular lens 10 is no more than 1 mm, ensuring a good polishing effect and electric field strength.

[0053] (2) Liquid nitrogen is sprayed on the intraocular lens 10 using the liquid nitrogen cooling system 66. As a preferred solution, liquid nitrogen is sprayed on the intraocular lens 10 through the nozzle 70 so that the temperature of the intraocular lens 10 is stabilized below the glass transition temperature.

[0054] (3) Turn on the high-voltage DC power supply 30 and adjust the voltage to 1500-3000V. A high-voltage electric field is formed between the tool needle 28 and the annular electrode 26. The electrorheological effect occurs in the electrorheological fluid 82. The flow of the electrorheological fluid has the properties of a Bingham medium. The polishing abrasive particles gather at the other end of the tool needle 28 to form a soft and flexible polishing head, such as Figure 5 As a preferred solution, the voltage is adjusted to 3000V.

[0055] (4) Start the motor 16, adjust the speed of the tool needle 28 to 1500-3000r / min, and make the rotating tool 12 reciprocate along the Y-axis direction, which refers to the Y-axis direction of the CNC machine tool, to drive the abrasive particles in the flexible polishing head to remove a small amount of material from the surface of the intraocular lens 10 and achieve polishing. As a preferred solution, through the setting of the CNC machine tool, the reciprocating speed of the rotating tool 12 along the Y-axis direction is 0.5-2mm / s, and the reciprocating stroke is 10mm. As a preferred solution, adjust the speed of the tool needle 28 to 2000r / min, and make the reciprocating speed of the rotating tool 12 along the Y-axis direction to 1mm / s. The outermost diameter of the annular electrode 26 is preferably 5mm, and the diameter of the flexible polishing head formed after the electrorheological effect occurs is greater than 5mm. The diameter of the aspherical optical part of the intraocular lens 10 is about 5mm, so the flexible polishing head can cover the surface of the intraocular lens 10 well. The X-axis of the CNC machine tool is pre-adjusted, and the rotating tool 12 does not move in the X-axis direction during polishing. The back and forth stroke of the rotating tool 12 along the Y-axis direction is set to 10 mm to improve the polishing quality.

[0056] (5) After polishing is completed, the high voltage DC power supply 30 and the motor 16 are turned off, the tool needle 28 stops moving, and the intraocular lens 10 is removed.

[0057] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0058] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for polishing an intraocular lens using electrorheological effect, characterized in that: The invention comprises a rotating tool, which comprises a supporting plate, a motor, a conductive slip ring, an outer sleeve, a tool shaft, a connecting flange, an annular electrode and a tool needle. The motor, the outer ring of the conductive slip ring and the outer sleeve are all mounted on the supporting plate. The motor drives the tool shaft to rotate through a transmission assembly. One end of the tool shaft is tightly matched with the inner ring of the conductive slip ring, and the other end of the tool shaft extends into the outer sleeve. The connecting flange is mounted on the outer sleeve. The annular electrode is connected with the connecting flange. One end of the tool needle is connected with the tool shaft, and the other end of the tool needle extends out of the annular electrode. The annular electrode is axially provided with a central through hole, and a gap between the hole wall of the central through hole and the outer wall of the tool needle is 1-2 mm. One end of the tool needle passes through the central through hole and is threadedly connected to the tool shaft. The outer wall of the annular electrode is threadedly connected to the inner wall of the connecting flange. The annular electrode is connected to the positive electrode of a high-voltage DC power supply, and the conductive slip ring is connected to the negative electrode of the high-voltage DC power supply.

2. The device for polishing an intraocular lens using electrorheological effect according to claim 1, characterized in that: The transmission assembly includes a first synchronous pulley, a second synchronous pulley and a synchronous belt connecting the first synchronous pulley and the second synchronous pulley. The first synchronous pulley is installed on the output shaft of the motor, and the second synchronous pulley is installed on the tool shaft.

3. The device for polishing an intraocular lens using electrorheological effect according to claim 1, characterized in that: A retaining ring is installed in the outer sleeve, a first step is provided on the tool shaft, a deep groove ball bearing is installed on the tool shaft, and two axial ends of the deep groove ball bearing are respectively in contact with the retaining ring and the first step.

4. The device for polishing an intraocular lens using electrorheological effect according to claim 3, characterized in that: The tool shaft is provided with a second step, a pair of angular contact bearings are installed on the tool shaft, and the other end of the tool shaft is threadedly connected with a locking nut.

5. The device for polishing an intraocular lens using electrorheological effect according to claim 1, characterized in that: A liquid nitrogen cooling system is also provided, and the liquid nitrogen cooling system is used to cool the artificial lens.

6. A method for polishing an intraocular lens using electrorheological effect, characterized in that: Using the device as described in any one of claims 1 to 5, comprising the following steps: (1) Positioning the intraocular lens in the processing tank, pouring a pre-configured electrorheological fluid into the processing tank, and adjusting the rotating tool so that there is a gap between the other end of the tool needle and the intraocular lens, and the other end of the tool needle is immersed in the electrorheological fluid; (2) using a liquid nitrogen cooling system to spray liquid nitrogen onto the intraocular lens; (3) Turn on the high voltage DC power supply and adjust the voltage to 1500-3000V; (4) Start the motor and adjust the speed of the tool needle to 1500-3000 r / min, while making the rotating tool reciprocate along the Y-axis direction; (5) After polishing is completed, turn off the high-voltage DC power supply and the motor, stop the tool needle from moving, and remove the intraocular lens.

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