Contact lens for ophthalmic surgery

Abstract

The present invention discloses a contact lens for ophthalmic surgery. The contact lens for ophthalmic surgery includes a lens body for covering the cornea and includes a rear surface in contact with the cornea and a front surface opposite to the rear surface. The lens body has a notch that recesses radially inward from the edge and penetrates from the front surface to the rear surface, and the notch is configured to correspond to a corneal surgical incision. The lens body of the present invention is provided with a notch at the edge, and the position and size of the notch both correspond to the corneal surgical incision. Therefore, surgical instruments can directly enter the incision through the notch without pushing the contact lens, so that the contact lens stably covers the cornea, keeps the cornea moist and the surgical field always clear.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and in particular to a corneal contact lens used for ophthalmic surgery. Background Art

[0002] During ophthalmic surgery, prolonged exposure of the cornea to air can lead to corneal epithelial dryness and cause turbidity and edema, i.e. iatrogenic corneal epithelial dysfunction. At the same time, corneal dryness and turbidity will affect the clarity of the surgeon's surgical field of view, thus affecting the surgical operation and even causing complications.

[0003] To address this problem, the first solution currently used in clinical practice is for an assistant to frequently apply saline solution to the cornea with a syringe. However, frequent application of water itself will have a certain degree of impact on the corneal epithelium and may cause corneal opacity of varying degrees, affecting the recovery of corneal epithelial function and vision after surgery. The second solution is to use corneal protective agents on the cornea. Compared with the first solution, this method reduces the number of instillations, but the disadvantage of this method is that the corneal protective agent may be lost as the operation time increases. Longer operations still need to be used repeatedly, which may still cause corneal epithelial edema and opacity. The third method is used during vitrectomy surgery, using corneal contact lenses to cover the cornea. Covering the cornea with corneal contact lenses during surgery can prevent the cornea from drying out throughout the operation and maintain the clarity of the surgical field of view. Since soft corneal contact lenses are easily deformed and affect the operator's visual observation, hard corneal contact lenses are more effective.

[0004] The above problem of corneal drying also exists during cataract surgery. Since the surgical incision of cataract surgery is partially or completely inside the cornea, and the surgical incision has a certain length, width and depth, if a contact lens is used to cover the cornea, when the surgical instrument enters the incision, the incision will be stretched upward to a certain extent. At this time, the contact lens will be pushed by the surgical instrument and shifted, and it will not be able to achieve the purpose of stably covering the cornea and keeping the cornea moist and the surgical field clear at all times. The problem of corneal exposure and drying also exists in other ophthalmic surgeries, such as cataract-vitrectomy combined surgery, glaucoma surgery, glaucoma-cataract combined surgery, strabismus and amblyopia surgery, eye trauma surgery, etc. In all of the above surgeries, the eyelids need to be continuously pulled open, so there is a problem of corneal exposure and drying for a long time. Summary of the invention

[0005] The object of the present invention is to provide a corneal contact lens for ophthalmic surgery to protect the cornea and maintain visual field clarity during the operation.

[0006] The present invention provides a corneal contact lens for ophthalmic surgery, comprising:

[0007] The lens body is for covering the cornea and includes a rear surface in contact with the cornea and a front surface opposite to the rear surface. The lens body has a notch that recesses radially inwards from the edge and penetrates from the front surface to the rear surface, and the notch is configured to correspond to a corneal surgical incision.

[0008] In some embodiments, the notch includes a notch edge line on the front surface. The notch edge line includes a first end point and a second end point located at both ends respectively and a midpoint located between the first end point and the second end point, and the notch edge line is symmetric with respect to a radius line passing through the midpoint.

[0009] In some embodiments, the notch edge line is an arc extending from the first end point to the second end point.

[0010] In some embodiments, the notch edge line includes a first side line segment extending radially from the first end point, a second side line segment extending radially from the second end point, and a third side line segment connected between the first side line segment and the second side line segment, wherein the third side line segment is a straight line or an arc.

[0011] In some embodiments, the third side line segment is an arc protruding towards the edge of the front surface.

[0012] In some embodiments, at least two notches include a first notch and a second notch, and the first notch and the second notch are respectively located on both sides of the center of the lens body.

[0013] In some embodiments, the area of one of the first notch and the second notch is larger than the area of the other notch.

[0014] In some embodiments, the first notch includes a first notch edge line on the front surface, and the second notch includes a second notch edge line on the front surface, wherein the straight-line distance between the two end points of the first notch edge line ranges from [2 mm, 8 mm]; and / or, the straight-line distance between the two end points of the second notch edge line ranges from [1 mm, 5 mm].

[0015] In some embodiments, the first notch includes a first notch edge line on the front surface, and the second notch includes a second notch edge line on the front surface, wherein in the radial direction, the straight-line distance from the midpoint of the first notch edge line to the original edge line of the front surface at the first notch ranges from [1 mm, 4 mm]; and / or, in the radial direction, the straight-line distance from the midpoint of the second notch edge line to the original edge line of the front surface at the second notch ranges from [0.5 mm, 3 mm].

[0016] In some embodiments, the first notch includes a first notch edge line located on the front surface, the second notch includes a second notch edge line located on the front surface, and the angular range between the line connecting the midpoint of the first notch edge line and the center of the front surface and the line connecting the midpoint of the second notch edge line and the center of the front surface is [80°, 120°].

[0017] In some embodiments, at least two notches include a first notch and a second notch. The first notch includes a first notch edge line located on the front surface, the second notch includes a second notch edge line located on the front surface, and the shapes of the first notch edge line and the second notch edge line are the same.

[0018] In some embodiments, at least two notches include a first notch and a second notch, and the first notch and the second notch are spaced apart; or the first notch and the second notch are connected to each other.

[0019] In some embodiments, the side surface of the notch includes an arc surface; or the side surface of the notch includes at least two arc surfaces, and the at least two arc surfaces intersect.

[0020] In some embodiments, the angle between the side surface of the notch and the front surface is an obtuse angle; and / or the angle between the side surface of the notch and the rear surface is an obtuse angle.

[0021] In some embodiments, surgical reference marks are provided on the front surface.

[0022] In some embodiments, the notch includes a notch edge line located on the front surface, and the surgical reference mark includes an edge reference mark that takes the midpoint of the notch edge line as the coordinate zero point and is arranged along the notch edge line and the edge of the lens body.

[0023] In some embodiments, the surgical reference mark includes an astigmatism reference angle mark, and the astigmatism reference angle mark is arranged circumferentially with the center of the lens body as the center of the circle.

[0024] In some embodiments, the notch includes a first notch and a second notch, and the surgical reference mark includes an incision reference angle mark. The incision reference angle mark is arranged along the second notch edge line of the second notch and represents the included angle between the line connecting a point on the second notch edge line and the center of the lens body and the line connecting the midpoint of the first notch edge line and the center of the lens body.

[0025] In some embodiments, the surgical reference mark includes a central reference line provided on a circumference with the center of the lens body as the center of the circle. Among them, the central reference line is a continuous distributed marking circle along the circumference; or the central reference line includes at least two pairs of marking line segments that are spaced apart and oppositely arranged on the circumference.

[0026] In some embodiments, the corneal contact lens is made by cutting the lens body.

[0027] In some embodiments, the range of the radius of curvature of the rear surface of the lens body is [7.8 mm, 10.6 mm]; and / or, the range of the radius of curvature of the front surface of the lens body is [7.8 mm, 10.6 mm]; and / or, the range of the diameter of the lens body is [11.5 mm, 14.5 mm].

[0028] Based on the technical solution provided by the present invention, a notch is provided at the edge of the lens body, and the position and size of the notch correspond to the corneal surgical incision. Therefore, the surgical instrument can directly enter the incision through the notch without pushing the corneal contact lens, so that the corneal contact lens stably covers the cornea, keeping the cornea moist and the surgical field always clear.

[0029] Other features and advantages of the present invention will become clear from the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 is a schematic three-dimensional structure diagram of a corneal contact lens according to an embodiment of the present invention;

[0032] Figure 2 is a schematic three-dimensional structure diagram of a corneal contact lens according to another embodiment of the present invention;

[0033] Figure 3 is Figure 2 a partial enlarged view of the notch of the corneal contact lens shown in the sagittal section passing through the meridian of the lens body;

[0034] Figure 4 is a sagittal section diagram of the notch of a corneal contact lens according to another embodiment of the present invention passing through the meridian of the lens body;

[0035] Figure 5 is Figure 4 a partial enlargement of the sagittal section in;

[0036] Figure 6 is Figure 2 a schematic top view structure diagram of the front surface of the corneal contact lens shown in;

[0037] Figure 7 is a schematic front surface structure diagram of a corneal contact lens according to another embodiment of the present invention;

[0038] Figure 8 is a schematic front surface structure diagram of a corneal contact lens according to still another embodiment of the present invention;

[0039] Figure 9 Schematic diagram of the front surface of a contact lens according to a specific embodiment of the present invention;

[0040] Figure 10 Schematic diagram of the front surface of a contact lens according to a specific embodiment of the present invention;

[0041] Figure 11 Schematic diagram of the front surface of a contact lens according to a specific embodiment of the present invention;

[0042] Figure 12 Schematic diagram of the front surface of a contact lens according to a specific embodiment of the present invention;

[0043] Figure 13 Schematic diagram of the front surface of a contact lens according to a specific embodiment of the present invention. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0045] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the sake of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0046] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both orientations of "above" and "below". The device may also be positioned in other different ways, and corresponding interpretations of the spatial relative descriptions used herein will be made.

[0047] In cataract surgery, a corneal incision needs to be made first. Most doctors need to make two incisions, a main incision and a side incision, to complete the surgery, while some doctors still use only one incision to complete the surgery. The main incision is the main passage for cataract extraction and subsequent lens implantation. Depending on different surgical methods, different surgical instruments or equipment systems, and different implanted lenses, different sizes of main incisions need to be made during the surgery. Doctors who make a single incision complete the surgical requirements of the above two incisions through a larger incision, which is more common in the manual small-incision surgical method. When making the incision, the surgical channel formed by the scalpel entering the eye from outside the cornea is also called the corneal tunnel. There are also problems of corneal exposure and dryness in other ophthalmic surgeries, such as cataract-vitrectomy combined surgery, glaucoma surgery, glaucoma-cataract combined surgery, strabismus and amblyopia surgery, eye trauma surgery, etc. In all of the above surgeries, the eyelids need to be continuously pulled apart, so there are problems of long-term corneal exposure and dryness.

[0048] To avoid the corneal contact lens moving when the surgical instrument enters the incision in the above ophthalmic surgeries, as Figure 1 shown, the corneal contact lens for ophthalmic surgery according to an embodiment of the present invention includes a lens body 1. The lens body 1 is used to cover the cornea and includes a rear surface in contact with the cornea and a front surface opposite to the rear surface. The lens body 1 has a notch that is recessed radially inward from the edge and penetrates from the front surface to the rear surface, and the notch is configured to correspond to the corneal surgical incision.

[0049] The lens body 1 is provided with a notch at the edge, and the position and size of the notch correspond to the corneal surgical incision. Therefore, the surgical instrument can directly enter the incision through the notch without pushing the corneal contact lens, so that the corneal contact lens stably covers the cornea, keeping the cornea moist and the surgical field always clear.

[0050] The lens body 1 of this embodiment has at least one notch.

[0051] In the embodiment shown as Figure 1 , a notch is provided on the lens body 1, and this notch is the first notch 2. The contact lens of this embodiment is applicable to ophthalmic surgeries with only one incision.

[0052] In order to adapt to the main incision and the side incision in cataract surgery, in the embodiment shown as Figure 2 , two notches are provided on the lens body 1, namely the first notch 2 and the second notch 3 respectively. Among them, the first notch 2 corresponds to the main incision, and the second notch 3 corresponds to the side incision. And the first notch 2 and the second notch 3 are respectively arranged on both sides of the center of the lens body 1. The contact lens of this embodiment is obtained by cutting the lens body 1. Before cutting, the circumferential original edge line of the lens body 1 is circular, Figure 1 and Figure 2 the original edge line corresponding to the notch area part is shown with a dotted line. It also needs to be explained here that Figure 1 and Figure 2 the multiple auxiliary lines extending radially outward from the center O of the lens body 1 in

[0053] are drawn to assist in showing the curved surface of the outer surface of the lens body 1, and do not mean that there are such multiple auxiliary lines on the contact lens of the present application.

[0054] In other embodiments, more than three notches can also be provided on the lens body 1.

[0055] For example, for some complex cases, doctors need to make more incisions to complete the surgery. For example, the inability to dilate the pupil due to various reasons will block the surgeon's field of view. Sometimes the surgeon will use a retractor to hook to the edge of the pupil to physically enlarge the pupil. Usually, four retractors are used, and these four retractors need to enter the eye through four small incision channels on the cornea. At this time, the contact lens applicable to this type of surgery needs to be provided with more than two notches, such as four or more.

[0055] As Figure 2 and Figure 3 shown, the side surface of the notch in this embodiment includes two intersecting arc surfaces. And the shape of the intersection line formed by the intersection of the two arc surfaces is similar to the notch edge line. As Figure 3 shown, in the sagittal section passing through the meridian of the lens body 1, the angle α between the side surface of the notch and the front surface in this embodiment is an obtuse angle. The angle β between the side surface of the notch and the back surface is an obtuse angle. Such a setting avoids damaging the cornea at the notch. Further, the endpoints of the first notch edge line and the second notch edge line are also rounded to avoid damaging the cornea. In another embodiment, as Figure 4 and Figure 5As shown, the side surface of the notch in this embodiment includes a curved surface. In the sagittal section passing through the meridian of the lens body 1, the angle α between this curved surface and the front surface of the lens body 1 is an obtuse angle. Similarly, the angle β between this curved surface and the rear surface of the lens body 1 is an obtuse angle. Specifically, this curved surface protrudes outward from the lens body 1. In embodiments not shown in other drawings, the side surface of the notch may also include more than three curved surfaces, and the more than three curved surfaces intersect. As long as it is ensured that the angle between the side surface and the front surface is an obtuse angle and the angle between the side surface and the rear surface is an obtuse angle.

[0056] The size of the notch provided on the lens body 1 in this embodiment is adapted to the size of the surgical incision. First, a brief description of the size of the surgical incision will be given below. The length of the main incision for phacoemulsification surgery is generally 1.5 - 3.2 mm, the width is 2 - 3 mm, and a foldable intraocular lens is implanted. In traditional small-incision surgery, an intraocular lens made of hard material usually needs to be implanted, so the incision size needs to be not less than the diameter of the lens. The incision length of the main incision surgery is 5.5 - 7 mm, and the width is 2 - 4 mm. The side incision is made to assist the main incision for two-handed operation and is a channel for instruments to enter and exit, so its size is usually smaller than that of the main incision. The length and width of the side incision for phacoemulsification surgery are generally both within 0.5 - 2 mm. The length of the side incision for small-incision surgery is 2 - 4 mm, and the width is 1.5 - 3 mm. To sum up, currently, the length range of the main incision for cataract surgery is generally 1.5 - 7 mm, and the width range is generally 1 - 4 mm; the length range of the side incision is generally 1 - 4 mm, and the width is 0.5 - 3 mm.

[0057] To be adapted to the size of the above-mentioned surgical incision, the sizes of the first notch 2 and the second notch 3 in this embodiment are different. Specifically, if the first notch 2 corresponds to the main incision and the second notch 3 corresponds to the side incision, then the area of the first notch 2 is larger than the area of the second notch 3. The area here refers to the area of the region enclosed by the edge line of the first notch and the original edge line of the lens body 1.

[0058] In clinical practice, most doctors are right-handed, and some doctors are left-handed. The difference between the two in cataract surgery is that the positions of the main incision and the side incision are exactly opposite. Generally speaking, the side where the dominant hand is located is the position of the main incision, and the position where the non-dominant hand is located is the position of the side incision. Therefore, the relative positions of the first notch 2 and the second notch 3 need to be different according to the positions of the main incision and the side incision. That is to say, in some embodiments, the area of the first notch 2 is larger than the area of the second notch 3, and in some other embodiments, the area of the first notch 2 is smaller than the area of the second notch 3. Of course, the area of the first notch 2 can also be equal to the area of the second notch 3.

[0059] The notch in this embodiment penetrates from the front surface to the rear surface. Below, a detailed description will be given of the shape and size of the notch edge line on the front surface of the notch.

[0060] The notch edge line of this embodiment includes a first endpoint and a second endpoint located at both ends respectively, and a midpoint located between the first endpoint and the second endpoint. The straight-line distance between the first endpoint and the second endpoint is defined as the endpoint distance, and the distance between the midpoint and the original edge line is defined as the midpoint distance. Specifically, as Figure 2 and Figure 6 shown, the first notch edge line of the first notch 2 includes a first endpoint A, a second endpoint B, and a midpoint C located between the first endpoint A and the second endpoint B. The lens body 1 of this embodiment is circular, and the intersection point of the radius line passing through the midpoint C and the original edge line of the lens body 1 is D. Similarly, the second notch edge line of the second notch 3 includes a first endpoint E, a second endpoint F, and a midpoint G, and the intersection point of the radius line passing through the midpoint G and the original edge line of the lens body 1 is H.

[0061] Since the length range of the main incision for cataract surgery is generally 1.5 - 7 mm, and the width range is generally 1 - 4 mm, in order to prevent the surgical instrument from pushing the corneal contact lens when entering the incision, as Figure 2 and Figure 3 shown, the range of the endpoint distance L1 of the first notch edge line of this embodiment is [2 mm, 8 mm]. In the radial direction, the range of the midpoint distance K1 of the first notch edge line is [1 mm, 4 mm].

[0062] The length range of the side incision for cataract surgery is generally 1 - 4 mm, and the width is 0.5 - 3 mm. The range of the endpoint distance L2 of the second notch edge line of this embodiment is [1 mm, 5 mm]. In the radial direction, the range of the midpoint distance K2 of the second notch edge line is [0.5 mm, 3 mm]. The endpoint distances of the notch edge lines of this embodiment are all greater than the lengths of the corresponding incisions to leave space to prevent the surgical instrument from pushing the corneal contact lens, and the relatively large notch can also meet the flexible requirements of the surgeon for different angular changes.

[0063] Within the above ranges, the shape of the notch edge line can be any shape passing through the three points of the two endpoints and the midpoint. For example, arc-shaped, groove-shaped, etc.

[0064] Preferably, the notch edge line is symmetric with respect to the radius line passing through the midpoint. And in the corresponding radial direction, when the midpoint distance is the maximum distance among the distances from any point on the notch edge line to the original edge line of the lens body before cutting, it is a preferred design. For example Figure 2 and Figure 6 shown, the notch edge line is an arc, and this arc bulges towards the center O of the lens body 1.

[0065] The shapes of the first notch edge line of the first notch 2 and the second notch edge line of the second notch 3 in this embodiment are the same. And for example, in Figures 6 to 11In the illustrated embodiment, the side lines of the first notch 2 and the second notch 3 are both arcs.

[0066] In embodiments not shown in other figures, the shapes of the first notch and the second notch may also be different from each other, as long as it is allowed for the surgical instrument to enter the incision without pushing the contact lens.

[0067] Specifically, the side line of the first notch in this embodiment is an arc extending from the first endpoint A to the second endpoint B. Similarly, the side line of the second notch in this embodiment is also an arc extending from its first endpoint E to the second endpoint F. The side line of the first notch is symmetric with respect to the radius line passing through its center C. The side line of the second notch is symmetric with respect to the radius line passing through its midpoint G.

[0068] In another embodiment, the side line of the notch includes a first side line segment extending radially from the first endpoint, a second side line segment extending radially from the second endpoint, and a third side line segment connecting between the first side line segment and the second side line segment, wherein the third side line segment is a straight line or an arc.

[0069] As Figure 12 shown, the first side line of the first notch 2 includes a first side line segment extending radially from the first endpoint A, a second side line segment extending radially from the second endpoint B, and a third side line segment connecting between the first side line segment and the second side line segment, and the third side line segment is a straight line. That is to say, the first side line of the first notch in this embodiment is formed by the other three sides of a rectangle with one long side missing. The shape of the second notch 3 in this embodiment is the same as that of the first notch 2, but with different sizes.

[0070] As Figure 13 shown, different from the embodiment Figure 12 shown, the third side line segment of the first side line of the first notch 2 in this embodiment is an arc. And this arc bulges towards the edge of the front surface. Similarly, the shape of the second notch 3 in this embodiment is the same as that of the first notch 2, but with different sizes.

[0071] The first notch 2 and the second notch 3 in this embodiment are spaced apart.

[0072] In embodiments not shown in other figures, the first notch and the second notch may also be connected to each other.

[0073] The main incision and the side incision in cataract surgery are made to facilitate the simultaneous operation of instruments with both hands and to complete the surgery in cooperation with each other. The angle formed by the central radii of the two incisions is usually 80 - 120° clinically. When the angle is too small, the body center of gravity moves backward, away from the patient, and the two hands are too close. The corneal tunnel will limit the cooperation of the instruments in both hands. When the angle is too large, the surgeon needs to move the body center of gravity forward, getting closer to the patient, and the two hands are too separated. The instruments are also not easy to cooperate with and are likely to cause fatigue in both arms. According to the changes in conditions such as the positions of the two eyes, the sizes of the eyelids, and the heights of the orbital bones of different patients, the placement positions of the surgeon's two hands will also change. Therefore, this angle is often a range of values rather than a fixed angle. For doctors, a comfortable and sustainable surgical posture is very important.

[0074] In order to adapt to the angle formed between the central radii of the main incision and the side incision as described above, the angle between the line connecting the midpoint C of the first notch edge line and the center O of the front surface and the line connecting the midpoint G of the second notch edge line and the center O of the front surface in this embodiment is defined as the incision reference angle θ, and the range of this incision reference angle θ is [80°, 120°].

[0075] During the cataract surgery process, after the incision is completed, the doctor will then complete the capsulotomy step. Since the cataract to be removed during the surgery is wrapped in the middle by two layers of capsule membranes, the doctor needs to tear a hole above the anterior capsule membrane as a passage to remove the cloudy crystal inside. The diameter of this capsular bag opening is usually 5.0 - 5.5 mm, which can just cover the edge of the intraocular lens implanted in the posterior capsular bag. The diameter of the intraocular lens is generally 5.5 - 6.0 mm, and the largest can reach 7.0 mm. Too small a capsular bag will tightly wrap the crystal, and postoperative capsular bag contraction will cause problems such as crystal dislocation. If the capsular bag is too large, it cannot wrap the edge of the crystal, and the crystal is likely to protrude from the capsular bag, further causing other problems. However, there is no reference scale for the doctor to complete the operation during the capsulotomy process. Therefore, especially for beginners or doctors with less surgical experience, it is often impossible to make a capsular bag opening of the appropriate size.

[0076] Moreover, clinically, for patients with corneal astigmatism greater than 0.75D, it is necessary to implant an astigmatism-correcting intraocular lens. The implantation of the astigmatism lens requires the astigmatism axis to be placed in an accurate position. During the surgical process, it is necessary to mark the horizontal position on the patient's cornea before the operation, and then use a 360° metal marking disc and a color marking pen to mark the lens axis position and the corneal incision position during the operation. However, the tip of the marking pen is relatively thick, so the marked angle is not precise. The marked points will also fade or even disappear due to the flushing of the liquid during the operation, bringing the trouble of repeated marking. At present, the axis position and the incision position during astigmatism lens surgery can also be projected onto the cornea by combining a special device and a microscope, but this method requires a separate device to provide surgical parameters and projection functions, and has high requirements for the configuration of the microscope. At the same time, the tracking function has a certain delay, so it can only be realized in a few large ophthalmic centers with conditions, and it cannot be used at the grass-roots level. Therefore, if fine angular scale lines can be added to the contact lens, the steps of using the metal marking ring and the marking pen during the operation can be omitted, and the angle can be indicated in real time during the operation, and the angle indication is more accurate. At the same time, the infection risk caused by multiple operations of the metal marking disc and the marking pen is avoided, and expensive surgical equipment is not required.

[0077] In order to facilitate the surgeon to accurately locate the angle and position during the operation, a surgical reference mark is also provided on the front surface of the lens body 1 of the present embodiment.

[0078] Specifically, as Figure 7 shown, an astigmatism reference angle mark 4 is provided on the front surface of the present embodiment. The astigmatism reference angle mark 4 is arranged circumferentially with the center O of the lens body 1 as the center and includes astigmatism reference angle scale lines and astigmatism reference angle values. The astigmatism reference angle mark 4 is referenced to the patient's own body position, with 90° above the cornea, 270° below, 0° on the left, and 180° on the right. The astigmatism reference angle mark 4 is beneficial to assisting the implantation and positioning of the astigmatism lens. It simplifies the surgical procedure, increases the surgical accuracy, can be carried out in real time, and reduces the infection risk at the same time.

[0079] Specifically, astigmatism reference angle scale lines and astigmatism reference angle values from 180° to 360° are marked at positions more than 7 mm away from the lens center O. The scale lines are spaced at intervals of 1° - 5°, and the angle values are spaced at intervals of 10° - 30°. The length of the scale lines is 0.5 - 2.5 mm, and different degrees of intervals can be distinguished by different line segment lengths. According to the actual marking situation of the lens, only the scale lines are placed, and the angle values are not placed.

[0080] As Figure 8As shown, a notch reference angle mark 7 is provided on the second notch side line of the second notch 3. The notch reference angle mark 7 includes a plurality of notch reference angle scale lines and a notch reference angle value arranged at intervals along the second notch side line. The notch reference angle value refers to the included angle between the line connecting a point on the second notch side line and the center O of the lens body 1 and the line connecting the midpoint of the first notch side line and the center O of the lens body. The marking of the notch reference angle value is conducive to the surgeon referring to determine the angles of the two notches to better complete the operation.

[0081] Specifically, 1 to 5 notch reference angle scale lines and notch reference angle values can be set along the second notch side line at intervals of 5° - 10°. Among them, the scale line direction points to the center O. When only one notch reference angle mark is marked, it is marked at the midpoint of the side line. When multiple marks are made, they are symmetrically marked left and right with the midpoint as the center.

[0082] As Figure 8 shown, the marking of the notch also includes an edge reference mark 6 with the midpoint of the notch side line as the coordinate zero point and arranged along the notch side line and the edge of the lens body. The edge reference mark 6 includes edge reference scale lines and values. The midpoint of the first notch side line can be used as the coordinate 0 point, and edge reference scale lines with a total length of 6 - 8 mm and their numerical markings are provided along the side line and the lens edge.

[0083] For example, scale lines and numbers 1, 2, 3, 4 can be symmetrically marked on both sides of the coordinate 0 point respectively. Scale lines can be marked at 1.5, 2.5, and 3.5 without marking numbers. The length of the scale line is 0.5 - 1.5 mm, and the scale lines are kept parallel to the diameter where the 0 point is located.

[0084] As Figure 8 shown, the surgical reference mark of this embodiment includes a central reference line 5 arranged on the circumference with the center of the lens body 1 as the center of the circle. Among them, as Figure 7 shown, the central reference line 5 is a continuous distribution of marked circles along the circumference. As Figure 8 shown, the central reference line 5 includes at least two pairs of marked line segments arranged at intervals and opposite to each other on the circumference. The central reference line 5 serves as a position reference line for capsulotomy, intraocular lens implantation, and the safe operation area.

[0085] The refractive index of the material of the lens body 1 in this embodiment is 1.4 - 1.7. Preferably, to reduce costs, the material of the lens body 1 is selected as polymethyl methacrylate (PMMA).

[0086] The central thickness of the lens body 1 in this embodiment ranges from [0.15 mm, 0.3 mm]. In order to avoid additional influence on the fundus image while protecting the cornea, the lens diopter of the lens body 1 in this embodiment is 0D.

[0087] The lens body 1 of this embodiment is used to cover the cornea. To enable the lens body 1 to better cover the cornea, the range of the curvature radius of the posterior surface of the lens in this embodiment is [7.8 mm, 10.6 mm]. The range of the curvature radius of the anterior surface of the lens is [7.8 mm, 10.6 mm]. The range of the lens diameter is [11.5 mm, 14.5 mm]. The size of the lens body 1 is designed to be larger than that of the existing contact lens, so the lens body 1 can achieve better coverage of the cornea.

[0088] The following will Figures 9 to 13 describe in detail the structure of the contact lens of the specific embodiment shown.

[0089] As Figure 9 shown, the contact lens includes a lens body 1. There are two notches provided at the edge of the lens body 1, namely the first notch 2 and the second notch 3. The notch edges of the first notch 2 and the second notch 3 are both arcs, and the arcs bulge towards the center of the lens. The end point distance of the first notch edge of the first notch 2 is 4 mm, and the midpoint distance is 2 mm. The second notch edge is also a similar arc, with an end point distance of 2 mm and a midpoint distance of 1 mm. The incision reference angle θ is 90°. Edge reference marks are provided on the first notch edge, marking three groups of parallel scale lines at 0 point, 1.5 mm, 2 mm, and 3 mm respectively. This contact lens is used by surgeons who are accustomed to operating with both hands and have an angle of 90° when making the main incision of cataract phacoemulsification surgery with a length less than or equal to 4 mm, a width less than or equal to 2 mm, a side incision with a length less than or equal to 2 mm, and a width less than or equal to 1 mm.

[0090] As Figure 10 shown, the notch edges of the first notch 2 and the second notch 3 of the contact lens are both arcs, and the arcs bulge towards the center of the lens. Specifically, the end point distance of the first notch edge of the first notch 2 is 8 mm, and the midpoint distance is 4 mm. The end point distance of the second notch edge is 3 mm, and the midpoint distance is 1.5 mm. Different from the Figure 4 embodiment shown, the incision reference angle θ of this embodiment is 80°. Edge reference marks mark four groups of parallel scale lines at 0 point, 1.5 mm, 2 mm, 3 mm, and 4 mm respectively. This lens is suitable for surgeons who are accustomed to operating with both hands and have an angle of 80° when making the main incision of small incision cataract surgery with a length less than or equal to 6 mm, a width less than or equal to 4 mm, a side incision with a length less than or equal to 3 mm, and a width less than or equal to 1.5 mm.

[0091] As Figure 11 shown, the notch edges of the first notch 2 and the second notch 3 of the contact lens are both arcs, and the arcs bulge towards the center of the lens. Different from the Figure 4Different from the embodiments shown, the end point distance of the first notch edge line of the corneal contact lens is 7 mm, and the midpoint distance is 3 mm. The end point distance of the second notch edge line is 5 mm, and the midpoint distance is 3 mm. The incision reference angle θ is 100°. The central reference line 5 is three concentric circles with diameters of 5 mm, 5.5 mm, and 6 mm. Taking the midline position of the incision vertex reference angle as 90°, mark the 360-degree astigmatism reference angle outside the 6-mm central reference line 5. When the notch position cannot reach the 6-mm reference line, it can be moved inwards to the 5.5-mm and 5-mm central reference lines. This lens is suitable for surgeons who need intraoperative scale and angle reference, with the main incision length less than or equal to 7 mm, width less than or equal to 3 mm, side incision length less than or equal to 5 mm, width less than or equal to 3 mm, and a flexible included angle when operating with both hands.

[0092] As Figure 12 shown, the edge line shapes of the first notch 2 and the second notch 3 of the corneal contact lens are the same, both formed by the other three sides of a rectangle lacking one long side. The end point distance of the first notch edge line is 2 mm, and the midpoint distance is 1 mm. The end point distance of the second notch edge line is 1 mm, and the midpoint distance is 0.5 mm. The incision reference angle θ is 120°. Taking the midline position of the incision reference angle θ as 90°, mark the 360-degree astigmatism reference angle, and the diameter of the formed 360° ring is 8 mm. This lens is suitable for surgeons who are used to making incisions above the cornea, with the main incision length less than or equal to 2 mm, width less than or equal to 1 mm, side incision length less than or equal to 1 mm, width less than or equal to 0.5 mm, and a fixed included angle of 120° when operating with both hands, when implanting astigmatic lenses during cataract non-coaxial phacoemulsification surgery.

[0093] As Figure 13 shown, the shape of the first notch edge line is composed of an arc pointing from the vertex to the lens edge and two symmetric line segments on the left and right. The lens end point distance is 4 mm, and the vertex distance is 1.5 mm. The second edge line end point distance is 4 mm, and the vertex distance is 1.5 mm. The incision reference angle θ is 110°. Taking the midline position of the incision reference angle θ as 90°, mark the 360-degree astigmatism reference angle, the diameter of the formed 360° ring is 7 mm, and 4 marking points are made at 0°, 90°, 180°, and 270° corresponding to the astigmatism reference angle. This lens is suitable for surgeons who need intraoperative scale reference and / or astigmatic lens implantation, with the main incision length less than or equal to 4 mm, width less than or equal to 1.5 mm, side incision length less than or equal to 4 mm, width less than or equal to 1.5 mm, and a relatively fixed included angle of 110° when operating with both hands.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements on some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A contact lens for ophthalmic surgery, characterized in that, Comprising: A lens body (1) for covering the cornea and including a rear surface in contact with the cornea and a front surface opposite to the rear surface, the lens body (1) having a notch that is recessed radially inward from the edge and penetrates from the front surface to the rear surface, the notch being configured to correspond to a corneal surgical incision, and the notch including a notch edge line on the front surface; A surgical reference mark is provided on the front surface, the surgical reference mark including an edge reference mark (6) that is set with the midpoint of the notch edge line as the coordinate zero point and along the notch edge line and the edge of the lens body, the edge reference mark (6) being used to provide a length reference for the making of the incision; The notch includes a first notch (2) and a second notch (3), the surgical reference mark includes an incision reference angle mark (7), the incision reference angle mark (7) is set along the second notch edge line of the second notch (3) and represents the included angle between the line connecting the point on the second notch edge line and the center of the lens body (1) and the line connecting the midpoint of the first notch edge line and the center of the lens body (1).

2. The contact lens for ophthalmic surgery according to claim 1, wherein The notch includes a notch edge line on the front surface, the notch edge line including a first end point and a second end point located at both ends respectively and a midpoint located between the first end point and the second end point, and the notch edge line is symmetric with respect to the radius line passing through the midpoint.

3. The contact lens for ophthalmic surgery according to claim 2, wherein, The notch edge line is an arc extending from the first end point to the second end point.

4. The contact lens for ophthalmic surgery according to claim 2, characterized in that, The notch edge line includes a first side line segment extending radially from the first end point, a second side line segment extending radially from the second end point, and a third side line segment connected between the first side line segment and the second side line segment, wherein the third side line segment is a straight line or an arc.

5. The contact lens for ophthalmic surgery according to claim 4, characterized in that, The third side line segment is an arc protruding towards the edge of the front surface.

6. The corneal contact lens for ophthalmic surgery according to any one of claims 1 to 5, wherein the lens body (1) has at least two of the notches.

7. The contact lens for ophthalmic surgery according to claim 6, wherein The at least two notches include a first notch (2) and a second notch (3), and the first notch (2) and the second notch (3) are respectively located on both sides of the center of the lens body (1).

8. The contact lens for ophthalmic surgery according to claim 7, characterized in that, The area of one of the first notch (2) and the second notch (3) is larger than the area of the other notch.

9. The contact lens for ophthalmic surgery according to claim 8, wherein, The first notch (2) includes a first notch edge line on the front surface, the second notch (3) includes a second notch edge line on the front surface, wherein the range of the straight-line distance between the two end points of the first notch edge line is [2 mm, 8 mm]; and / or, the range of the straight-line distance between the two end points of the second notch edge line is [1 mm, 5 mm].

10. The contact lens for ophthalmic surgery according to claim 8, characterized in that, The first notch (2) includes a first notch edge line located on the front surface, and the second notch (3) includes a second notch edge line located on the front surface. Wherein, in the radial direction, the straight-line distance from the midpoint of the first notch edge line to the original edge line of the front surface at the position of the first notch ranges from [1 mm, 4 mm]; and / or, in the radial direction, the straight-line distance from the midpoint of the second notch edge line to the original edge line of the front surface at the position of the second notch ranges from [0.5 mm, 3 mm].

11. The corneal contact lens for ophthalmic surgery according to claim 8, characterized in that, The first notch (2) includes a first notch edge line located on the front surface, and the second notch (3) includes a second notch edge line located on the front surface. The angular range between the line connecting the midpoint of the first notch edge line and the center of the front surface and the line connecting the midpoint of the second notch edge line and the center of the front surface is [80°, 120°].

12. The contact lens for ophthalmic surgery according to claim 6, characterized in that, The at least two notches include a first notch (2) and a second notch (3). The first notch (2) includes a first notch edge line located on the front surface, and the second notch (3) includes a second notch edge line located on the front surface. The shape of the first notch edge line is the same as the shape of the second notch edge line.

13. The contact lens for ophthalmic surgery according to claim 6, characterized in that, The at least two notches include a first notch (2) and a second notch (3). The first notch (2) and the second notch (3) are spaced apart; or, the first notch and the second notch are connected to each other.

14. The contact lens for ophthalmic surgery according to any one of claims 1 to 5, characterized in that, The side surface of the notch includes an arc surface; or the side surface of the notch includes at least two arc surfaces that intersect.

15. The contact lens for ophthalmic surgery according to claim 14, characterized in that, The angle between the side surface of the notch and the front surface is an obtuse angle; and / or, the angle between the side surface of the notch and the rear surface is an obtuse angle.

16. The contact lens for ophthalmic surgery according to claim 1, characterized in that, The surgical reference mark includes an astigmatism reference angle mark (4), and the astigmatism reference angle mark (4) is arranged circumferentially with the center of the lens body as the center of the circle.

17. The contact lens for ophthalmic surgery according to claim 1, characterized in that, The surgical reference mark includes a central reference line (5) arranged on the circumference with the center of the lens body (1) as the center of the circle. Wherein, the central reference line (5) is a marked circle continuously distributed along the circumference; or, the central reference line (5) includes at least two pairs of marked line segments spaced and oppositely arranged on the circumference.

18. The contact lens for ophthalmic surgery according to claim 1, wherein The corneal contact lens is cut and made from the lens body (1).

19. The corneal contact lens for ophthalmic surgery according to claim 1, wherein, The range of the curvature radius of the rear surface of the lens body (1) is [7.8 mm, 10.6 mm]; and / or, the range of the curvature radius of the front surface of the lens body (1) is [7.8 mm, 10.6 mm]; and / or, the range of the diameter of the lens body (1) is [11.5 mm, 14.5 mm].

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