Handheld astigmatic mark device

Abstract

The application provides a handheld astigmatism marking device, which comprises a handheld assembly, an astigmatism disc, a sliding mechanism and a marking assembly, the astigmatism disc is installed at the end of the handheld assembly, and the sliding mechanism is slidingly installed on the astigmatism disc; the astigmatism disc comprises a disc surface plate, a disc bottom plate, a first connecting plate and a stop gear, the disc surface plate and the disc bottom plate are oppositely arranged and connected through the first connecting plate, a cavity is formed between the disc surface plate and the disc bottom plate, the stop gear is arranged in the cavity and located at the scale corresponding to the axial position of the pre-marking position; the marking assembly comprises a first marking assembly and a second marking assembly, the first marking assembly is arranged on the disc bottom plate at the corresponding position of 0° and 180° of the astigmatism disc, and the second marking assembly is arranged at the bottom end of the sliding mechanism; the sliding mechanism is slid on the astigmatism disc to the stop gear so that the second marking assembly marks at the pre-marking position. The handheld astigmatism marking device has the advantages of simple structure, small size, convenient use, accurate marking and use under a slit lamp or a surgical microscope.

Description

Technical Field

[0001] This invention relates to the field of ophthalmic surgical instruments, and in particular to a handheld astigmatism marker device. Background Technology

[0002] Currently, refractive cataract surgery has become the mainstream procedure. Besides removing the cloudy lens and implanting a clear intraocular lens (IOL), cataract surgery also requires correcting the patient's original refractive errors to restore emmetropia (normal vision) as much as possible post-surgery. Astigmatism of 75° or higher can cause severe vision loss; therefore, correcting astigmatism is crucial for improving post-operative visual quality. Existing methods for simultaneously correcting astigmatism during cataract surgery include: one is creating a limbal retraction incision (LRI) on the steep axis of the cornea to reduce some of the astigmatism; the other is implanting an astigmatically corrective IOL, aligning the IOL's markings with the pre-set implantation axis during surgery. This requires pre-operative axis marking on the cornea. A 1° deviation in the implantation axis of the astigmatically corrective IOL results in a 3.3% loss of astigmatism correction, while a 30° deviation completely eliminates the astigmatism correction and may even introduce new visual quality problems.

[0003] There are two commonly used methods for corneal axis marking. One is to mark the axis with a marker pen under the guidance of a slit lamp, but the marker pen tip has a large diameter, making the marked astigmatic axis less precise. The other method is to use the tip of a 1 ml syringe to puncture the corneal epithelium under the guidance of a slit lamp before staining with a marker pen. Although this allows the stain to remain on the cornea for a longer time, this method still carries risks. For example, the mark made by the syringe may not be straight; and the position of the mark may not be precise enough, which may result in the 0° and 180° marks not being on a straight line, making it impossible to determine the accurate position during surgery. Summary of the Invention

[0004] This invention provides a handheld astigmatism marking device to solve the technical problem of inaccurate corneal axis marking in the prior art.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] This invention provides a handheld astigmatism marking device, comprising a handheld component, an astigmatism disc, a sliding mechanism, and a marking component. The astigmatism disc is mounted at the end of the handheld component, and the sliding mechanism is slidably mounted on the astigmatism disc. The astigmatism disc includes a disc face plate, a disc base plate, a first connecting plate, and a stop tooth plate. The disc face plate and the disc base plate are opposite to each other and connected by the first connecting plate, forming a cavity between them. The stop tooth plate is disposed within the cavity and located at a corresponding graduation on the axis of the pre-marking position. The marking component includes a first marking component and a second marking component. The first marking component is respectively disposed on the disc base plate at corresponding positions of 0° and 180° on the astigmatism disc, and the second marking component is disposed at the bottom end of the sliding mechanism. The sliding mechanism slides on the astigmatism disc to the stop tooth plate so that the second marking component marks the pre-marking position.

[0007] Further, the sliding mechanism includes a first sliding plate, a second sliding plate, a second connecting plate, and a braking component. The first sliding plate and the second sliding plate are disposed opposite to each other and connected by the second connecting plate. The first sliding plate is located above the disc panel, and the second sliding plate is located below the disc base plate. The second marking component is installed at the bottom end of the second sliding plate. The braking component is installed on the first sliding plate and located in the cavity formed by the disc panel and the disc base plate. The second marking component has the same scale on the disc as the corresponding marking component. The first sliding plate and the second sliding plate slide on the disc until the braking component abuts against the stop tooth.

[0008] Furthermore, a sliding plate is formed on the side of the first slide plate, and the sliding plate extends along the side of the first slide plate; a track is formed on the disc panel, and the sliding plate slides in the track until the brake member abuts against the stop tooth.

[0009] Furthermore, the braking element is detachably connected to the first sliding plate.

[0010] Furthermore, the brake is movably mounted on the first slide plate, and a gap is provided between the stop tooth and the first slide plate. The bottom end of the brake is moved into the gap so that the brake passes over the stop tooth to the other side.

[0011] Furthermore, a first central slit is formed on the disc between 0° and 180°, penetrating the disc panel and the disc base plate. There are two tracks, which are symmetrically arranged with respect to the first central slit. There are two sliders, which are arranged opposite each other on both sides of the first sliding plate. The second connecting plate is disposed within the first central slit, and the sliders slide within the corresponding tracks.

[0012] Furthermore, a second central slit is formed on the disc between 180° and 360°, penetrating the disc panel and the disc base plate. There are two tracks, which are symmetrically arranged with respect to the second central slit. There are two sliders, which are arranged opposite each other on both sides of the first sliding plate. The second connecting plate is disposed in the second central slit, and the sliders slide within the corresponding tracks.

[0013] Furthermore, there are multiple stop teeth, each of which corresponds to a scale on the optical disc.

[0014] Furthermore, the second marking component includes a handle and a blunt blade. The handle is fixed to the bottom end of the sliding mechanism, and the blunt blade is connected to the handle. The blunt blade has a length of 1mm to 3mm, a width of 10μm to 40μm, and a thickness of 10μm to 15μm.

[0015] Furthermore, the handheld assembly includes a handle and a connecting rod, the end of which is formed with a clamping portion; the optical disc also includes a mounting rod, one end of which is fixed to the first connecting plate and the other end is installed in the clamping portion, the mounting rod and the clamping portion being detachably connected to adjust the angle between the optical disc and the connecting rod.

[0016] Furthermore, the handheld assembly includes a fixing member, the clamping part is a groove, the end of the mounting rod is a protrusion, the end of the mounting rod extends into the clamping part and rotates within the clamping part, and the fixing member fixes the mounting rod within the clamping part.

[0017] Furthermore, the handheld assembly includes a fixing member, the clamping part is a cylindrical cavity, the end of the mounting rod is inserted into the clamping part and rotates within the cylindrical cavity, and the fixing member fixes the mounting rod within the clamping part.

[0018] The handheld astigmatism marking device provided by this invention has first marking components respectively set on the base plate of the astigmatism disc at positions corresponding to 0° and 180°, which can conveniently mark the 0° and 180° axes on the cornea simultaneously. A sliding mechanism is set on the astigmatism disc, and a stop tooth is set in the cavity between the disc front plate and the disc back plate. The scale of the astigmatism disc at the position of the stop tooth corresponds to the axis of the pre-marked position on the cornea. The sliding mechanism stops moving when it slides on the astigmatism disc to the stop tooth. The second marking component installed at its bottom can accurately and conveniently mark the preset axis on the cornea. This handheld astigmatism marking device has a simple and compact structure, is easy to use, and marks accurately, and can be used under a slit lamp or surgical microscope. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the handheld astigmatism marking device in an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of a structure in which the optical disc and the sliding mechanism cooperate in an embodiment of the present invention;

[0022] Figure 3 This is another structural cross-sectional view of the cooperation between the optical disc and the sliding mechanism in an embodiment of the present invention.

[0023] Figure label:

[0024] 100. Handheld component; 110. Handle; 120. Connecting rod; 121. Clamping part;

[0025] 200. Dispersed disc; 210. Disc front panel; 211. Track; 220. Disc base plate; 230. First connecting plate; 240. Stop tooth plate; 250. First center seam; 260. Mounting rod;

[0026] 300. Sliding mechanism; 310. First sliding plate; 311. Sliding piece; 320. Second sliding plate; 330. Second connecting plate; 340. Braking component;

[0027] 400, Second marking component; 410, Tool holder; 420, Blunt blade. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0032] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0033] Reference Figures 1 to 3 This application provides a handheld astigmatism marking device, including a handheld component 100, an astigmatism disc 200, a sliding mechanism 300, and a marking component. The astigmatism disc 200 is mounted on the end of the handheld component 100, and the sliding mechanism 300 is slidably mounted on the astigmatism disc 200. The astigmatism disc 200 includes a disc front panel 210, a disc bottom plate 220, a first connecting plate 230, and a stop tooth 240. The disc front panel 210 and the disc bottom plate 220 are disposed opposite to each other and connected by the first connecting plate 230, forming a cavity between them. The stop tooth 240 is disposed in the cavity and located at the corresponding scale of the axis position of the pre-marking position. The marking assembly includes a first marking assembly and a second marking assembly 400. The first marking assembly is respectively disposed on the bottom plate 220 of the disc at corresponding positions of 0° and 180° on the disc 200, and the second marking assembly 400 is disposed at the bottom end of the sliding mechanism 300. The sliding mechanism 300 slides on the disc 200 to the stop tooth plate 240 so that the second marking assembly 400 marks at the pre-marking position.

[0034] In the embodiments of this application, reference is made to Figure 2A cavity is provided between the front panel 210 and the back panel 220 of the optical disc 200, and a stop tooth 240 is disposed within the cavity. The stop tooth 240 can be disposed on the front panel 210, the first connecting plate 230, or the back panel 220, as long as it can cooperate with the sliding mechanism 300 to stop the sliding mechanism 300. Furthermore, the graduations on the optical disc 200 corresponding to the stop tooth 240 correspond to the angles of pre-marked axes on the cornea. Therefore, when the sliding mechanism 300 slides to the position of the stop tooth 240 on the optical disc 200, the second marking component 400 can accurately mark the pre-marked axis.

[0035] Existing marking methods lack precision, resulting in the 0° and 180° markings not being aligned, making it impossible to determine the accurate location during surgery. In this embodiment, first marking components are installed on the base plate 220 at the positions corresponding to the 0° and 180° markings on the astigmatism disc 200. This allows for simultaneous marking of both 0° and 180° axes on the cornea, preventing the 0° and 180° axes from being misaligned and thus ensuring accurate location during surgery. The first marking component has the same structure as the second marking component 400, including a first handle and a first blunt blade. The first handle is installed on the base plate 220 at the positions corresponding to the 0° and 180° markings on the astigmatism disc 200, and the first blunt blade is connected to the first handle. The first blunt blade has a length of 1mm to 3mm, a width of 10μm to 40μm, and a thickness of 10μm to 15μm.

[0036] In this embodiment, the specific structure of the sliding mechanism 300 is not limited. Its function is to slide on the optical disc 200 and to be stopped by the stop tooth 240 so that the second marking component 400 can mark on the preset axis of the cornea.

[0037] The handheld astigmatism marking device provided in this application embodiment has first marking components respectively set on the base plate 220 at the 0° and 180° corresponding positions on the astigmatism disc 200, which can conveniently mark the 0° and 180° axes on the cornea simultaneously. A sliding mechanism 300 is set on the astigmatism disc 200, and a stop tooth 240 is set in the cavity between the disc front plate 210 and the disc base plate 220. The scale of the astigmatism disc 200 at the position of the stop tooth 240 corresponds to the axis of the pre-marked position on the cornea. The sliding mechanism 300 stops moving when it slides on the astigmatism disc 200 to the stop tooth 240. The second marking component 400 installed at its bottom end can accurately and conveniently mark the preset axis on the cornea. The above-mentioned handheld astigmatism marking device has a simple and compact structure, is easy to use, and marks accurately, and can be used under a slit lamp or surgical microscope.

[0038] In this embodiment, the base plate 220 of the astigmatism disc 200 has a curved surface with the same curvature as the anterior corneal surface, and a radius of curvature of 7.7 mm to 7.8 mm. Furthermore, the front plate 210 of the astigmatism disc 200 is designed with a frosted surface, which allows reflected light to be emitted in different directions without strong reflections, making it easier for the marker to observe the numbers on the astigmatism disc 200 under a surgical microscope and to make accurate markings. An antibacterial nano-coating is provided on the surface of the astigmatism disc 200. This antibacterial nano-coating can reduce corneal infections that may result from damage to the corneal epithelium during marking. The antibacterial nano-coating is preferably a polyhexamethylene biguanide plasma polymer.

[0039] In some embodiments, the sliding mechanism 300 includes a first sliding plate 310, a second sliding plate 320, a second connecting plate 330, and a brake 340. The first sliding plate 310 and the second sliding plate 320 are disposed opposite to each other and connected by the second connecting plate 330. The first sliding plate 310 is located above the disc panel 210, and the second sliding plate 320 is located below the disc base plate 220. The second marking component 400 is installed at the bottom end of the second sliding plate 320. The brake 340 is installed on the first sliding plate 310 and is located in the cavity formed by the disc panel 210 and the disc base plate 220. The marking component 400 and the brake 340 have the same scale on the disc 200. The first sliding plate 310 and the second sliding plate 320 slide on the disc 200 until the brake 340 abuts against the stop tooth 240.

[0040] Understandably, the first sliding plate 310 and the second sliding plate 320 can slide on the disc 200, while the brake 340 and the second marking assembly 400 slide synchronously until the brake 340 abuts against the stop tooth 240, blocking the movement of the brake 340, thereby stopping the second marking assembly 400 at the pre-marked position. The sliding mechanism 300 of this embodiment has a simple structure and is easy to move.

[0041] In some embodiments, a sliding piece 311 is formed on the side of the first sliding plate 310, and the sliding piece 311 extends along the side of the first sliding plate 310; a track 211 is formed on the disc panel 210, and the sliding piece 311 slides within the track 211 until the brake member 340 abuts against the stop tooth 240. Understandably, the arrangement of the sliding piece 311 and the track 211 makes the sliding mechanism 300 slide more smoothly on the disc 200, preventing the first sliding plate 310 and the second sliding plate 320 from detaching from the disc 200 during sliding.

[0042] When there are multiple pre-marked axes of the cornea, or when the handheld astigmatism marking device of this application embodiment is used as a general marking device to mark different corneal axes, the sliding mechanism 300 needs to slide to multiple different pre-marking positions. This requires moving the brake 340 to the next stop tooth 240 after completing one marking.

[0043] In some embodiments, the braking element 340 is detachably connected to the first sliding plate 310. That is, when the first sliding plate 310 slides on the optical disc 200, the braking element 340 is mounted on the first sliding plate 310; after the first sliding plate 310 slides until the braking element 340 abuts against the stop tooth 240 and the second marking component 400 marks the corneal preset axis position, the braking element 340 can be detached from the first sliding plate 310. The specific detachable structure of the braking element 340 and the first sliding plate 310 is not limited, and any structure that meets the requirements of the embodiments of this application can be used.

[0044] Understandably, after the first pre-marked axis position is marked, the second marking component 400 needs to be moved to another position for marking. At this time, the brake component 340 can be removed from the first slide plate 310 so that the brake component 340 can pass over the obstruction of the stop tooth 240. Then the brake component 340 is reinstalled on the first slide plate 310 and slid to the next pre-marked position.

[0045] In other embodiments, the brake member 340 is movably mounted on the first slide plate 310, and a gap is provided between the stop tooth 240 and the first slide plate 310. The bottom end of the brake member 340 is moved into the gap so that the brake member 340 crosses the stop tooth 240 to the other side. That is, a gap is provided between the bottom end of the stop tooth 240 and the first slide plate 310. When the bottom end of the brake member 340 moves to the gap, it can cross the stop tooth 240, thereby allowing the sliding mechanism 300 to continue moving to the next pre-marked position.

[0046] Understandably, the sliding mechanism 300 can slide along the periphery of the disc 200, or it can have other different sliding paths, such as penetrating the first center seam 250 and / or the second center seam between the disc front panel 210 and the disc back panel 220, see reference. Figure 3 .

[0047] In some embodiments, a first central slit 250 is formed on the disc 200 between 0° and 180°, penetrating the disc front panel 210 and the disc bottom plate 220. There are two tracks 211, which are symmetrically arranged with respect to the first central slit 250. There are two sliders 311, which are arranged opposite to each other on both sides of the first sliding plate 310. A second connecting plate 330 is disposed in the first central slit 250, and the sliders 311 slide in the corresponding tracks 211.

[0048] Understandably, the first center seam 250 can be located in the middle of the panel 210, as shown in the reference. Figure 3Alternatively, it can be located in other parts. The second connecting plate 330 is located within the first central seam 250 and moves along the first central seam 250. The first sliding plate 310 and the second sliding plate 320 can be symmetrically arranged along the first central seam 250 to facilitate smoother movement of the sliding mechanism 300. The number of tracks 211 on the disc panel 210 corresponds to the number of sliding pieces 311 on the first sliding plate 310. In this embodiment, corresponding to the same scale of the disc 200, the number of stop teeth 240 can be two, and the two stop teeth 240 are symmetrically arranged on both sides of the first central seam 250. Correspondingly, the number of brakes 340 on the first sliding plate 310 corresponds to the number of stop teeth 240 on the same scale.

[0049] The same design exists between 180° and 360° on the optical disc 200. In other embodiments, a second central slit is formed on the optical disc 200 between 180° and 360°, penetrating the disc front panel 210 and the disc bottom plate 220. There are two tracks 211, which are symmetrically arranged with respect to the second central slit. There are also two sliders 311, which are arranged opposite each other on both sides of the first sliding plate 310. A second connecting plate 330 is disposed within the second central slit, and the sliders 311 slide within the corresponding tracks 211.

[0050] Understandably, the second central seam can be located in the middle of the disc panel 210 or in other locations. The second connecting plate 330 is located within the second central seam and moves along it. The first sliding plate 310 and the second sliding plate 320 can be symmetrically arranged along the second central seam to facilitate smoother movement of the sliding mechanism 300. The number of tracks 211 on the disc panel 210 corresponds to the number of sliding pieces 311 on the first sliding plate 310. In this embodiment, corresponding to the same scale of the disc 200, the number of stop teeth 240 can be two, and the two stop teeth 240 are symmetrically arranged on both sides of the second central seam; correspondingly, the number of brakes 340 on the first sliding plate 310 corresponds to the number of stop teeth 240 on the same scale.

[0051] When both the first slit 250 and the second slit exist simultaneously, the 0° (360°) position and the 180° position on the astigmatism marking disc 200 are seamless, meaning the first slit 250 and the second slit are not connected. The sliding mechanism 300 on the astigmatism marking disc 200 can be set between 0° and 180°, and between 180° and 360° respectively. When there are multiple pre-marked axes on the cornea, or when the handheld astigmatism marking device of this application embodiment is used as a general marking device to mark different corneal axes, multiple stop teeth 240 need to be set. In some embodiments, the number of stop teeth 240 is multiple, and each stop tooth 240 corresponds to a scale on the astigmatism marking disc 200. That is, each scale on the astigmatism marking disc 200 is correspondingly provided with a stop tooth 240, at which time the sliding mechanism 300 can stop sliding at any stop tooth 240, and any preset marking position can be marked on the cornea. Generally, a stop tooth 240 is set every 10° on the loose disc 200.

[0052] In some embodiments, the second marking component 400 includes a handle 410 and a blunt blade 420. The handle 410 is fixed to the bottom end of the sliding mechanism 300, and the blunt blade 420 is connected to the handle 410. The blunt blade 420 has a length of 1 mm to 3 mm, a width of 10 μm to 40 μm, and a thickness of 10 μm to 15 μm.

[0053] In this embodiment, a blunt blade 420 is used for marking. On one hand, the size of the blunt blade 420 can be designed as needed, enabling more precise axial marking. On the other hand, the blunt blade 420 can puncture the corneal epithelium. Applying dye to the blunt blade 420 for marking allows the dye to penetrate the damaged area of ​​the corneal epithelium, resulting in clear, accurate markings that are not easily faded after rinsing. Corneal epithelial cells are regenerative cells, so puncture will not affect subsequent processes. The corneal epithelium is approximately 50 μm thick, and the width of the blunt blade 420 is 10 μm to 40 μm, thus avoiding damage to the anterior elastic lamina or stromal layer of the cornea.

[0054] In some embodiments, the handheld assembly 100 includes a handle 110 and a connecting rod 120. The end of the connecting rod 120 forms a clamping portion 121. The disc 200 also includes a mounting rod 260, one end of which is fixed to the first connecting plate 230, and the other end is installed within the clamping portion 121. The mounting rod 260 and the clamping portion 121 are detachably connected to adjust the angle between the disc 200 and the connecting rod 120. In this embodiment, the surface of the handle 110 is provided with a groove surrounding the periphery of the handle 110. Additionally, the surface of the handle 110 is set in a grid pattern, allowing for stable handholding and facilitating marking in different handholding postures. Understandably, the detachable connection between the mounting rod 260 and the clamping portion 121 allows for easy adjustment of the angle between the disc 200 and the connecting rod 120, enabling left-handed and right-handed markers to use one hand for marking.

[0055] In some embodiments, the handheld component 100 includes a fixing member, a clamping portion 121 is a groove, and the end of the mounting rod 260 is a protrusion. The end of the mounting rod 260 extends into the clamping portion 121 and rotates within it. The fixing member secures the mounting rod 260 within the clamping portion 121. That is, the clamping portion 121 and the end of the mounting rod 260 have a universal ball joint structure, allowing for 360° free rotation and fixation, further providing convenience for the marker and improving marking stability. In the embodiments of this application, the fixing member can be a screw or other elements capable of fixing the mounting rod 260 to the clamping portion 121. Figure 1 Not shown in the image.

[0056] In other embodiments, the handheld assembly 100 includes a fixing member, the clamping portion 121 is a cylindrical cavity, the end of the mounting rod 260 is inserted into the clamping portion 121 and rotates within the cylindrical cavity, and the fixing member secures the mounting rod 260 within the clamping portion 121. It is understood that the mounting rod 260 can also rotate freely 360° within the cylindrical cavity, providing convenience for the marker. In the embodiments of this application, the fixing member can be a screw or other elements capable of fixing the mounting rod 260 to the clamping portion 121. Figure 1 Not shown in the image.

[0057] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A handheld astigmatism marking device, characterized in that: It includes a handheld component, a loose disc, a sliding mechanism, and a marking component. The loose disc is mounted at the end of the handheld component, and the sliding mechanism is slidably mounted on the loose disc. The optical disc includes a disc panel, a disc base plate, a first connecting plate, and a stop tooth plate. The disc panel and the disc base plate are arranged opposite to each other and connected by the first connecting plate, forming a cavity between them. The stop tooth plate is disposed in the cavity and is located at the corresponding scale of the axis at the pre-marked position. The marking assembly includes a first marking assembly and a second marking assembly. The first marking assembly is respectively disposed on the bottom plate of the disc at corresponding positions of 0° and 180° on the disc, and the second marking assembly is disposed at the bottom end of the sliding mechanism. The sliding mechanism slides on the disc to the stop tooth plate so that the second marking assembly marks the pre-marking position. The sliding mechanism includes a first sliding plate, a second sliding plate, a second connecting plate, and a braking component. The first sliding plate and the second sliding plate are arranged opposite to each other and connected by the second connecting plate. The first sliding plate is located above the disc panel, the second sliding plate is located below the disc bottom plate, and the second marking component is installed at the bottom end of the second sliding plate. The braking component is mounted on the first sliding plate and located in the cavity formed by the disc front plate and the disc back plate. The second marking component has the same scale as the disc corresponding to the braking component. The first sliding plate and the second sliding plate slide on the disc until the braking component abuts against the stop tooth.

2. The handheld astigmatism marking device according to claim 1, characterized in that, A sliding plate is formed on the side of the first sliding plate, and the sliding plate extends along the side of the first sliding plate; a track is formed on the disc panel, and the sliding plate slides in the track until the brake member abuts against the stop tooth.

3. The handheld astigmatism marking device according to claim 1, characterized in that, The braking component is detachably connected to the first sliding plate.

4. The handheld astigmatism marking device according to claim 1, characterized in that, The brake component is movably mounted on the first slide plate. A gap is provided between the stop tooth and the first slide plate. The bottom end of the brake component is moved into the gap so that the brake component crosses the stop tooth to the other side.

5. The handheld astigmatism marking device according to claim 2, characterized in that, The disc has a first central slit between 0° and 180° that runs through the disc panel and the disc base. There are two tracks, which are symmetrically arranged with respect to the first central slit. There are two sliders, which are arranged opposite each other on both sides of the first sliding plate. The second connecting plate is disposed in the first central slit. The sliders slide within the corresponding tracks.

6. The handheld astigmatism marking device according to claim 2, characterized in that, The disc has a second central slit between 180° and 360° that runs through the disc panel and the disc base. There are two tracks, which are symmetrically arranged with respect to the second central slit. There are two sliders, which are arranged opposite each other on both sides of the first sliding plate. The second connecting plate is disposed in the second central slit. The sliders slide within the corresponding tracks.

7. The handheld astigmatism marking device according to any one of claims 1 to 6, characterized in that, There are multiple stop teeth, and each stop tooth corresponds to a scale on the optical disc.

8. The handheld astigmatism marking device according to any one of claims 1 to 6, characterized in that, The second marking component includes a handle and a blunt blade. The handle is fixed to the bottom end of the sliding mechanism, and the blunt blade is connected to the handle. The blunt blade has a length of 1mm to 3mm, a width of 10μm to 40μm, and a thickness of 10μm to 15μm.

9. The handheld astigmatism marking device according to any one of claims 1 to 6, characterized in that, The handheld assembly includes a handle and a connecting rod, the end of which has a clamping portion; the optical disc also includes a mounting rod, one end of which is fixed to the first connecting plate and the other end is installed in the clamping portion, the mounting rod and the clamping portion being detachably connected to adjust the angle between the optical disc and the connecting rod.

10. The handheld astigmatism marking device according to claim 9, characterized in that, The handheld assembly includes a fixing member, the clamping portion is a groove, and the end of the mounting rod is a protrusion. The end of the mounting rod extends into the clamping portion and rotates within the clamping portion. The fixing member secures the mounting rod within the clamping portion; or, The handheld assembly includes a fixing member, the clamping part is a cylindrical cavity, the end of the mounting rod is inserted into the clamping part and rotates in the cylindrical cavity, and the fixing member fixes the mounting rod in the clamping part.

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