CN212466322U

CN212466322U - Corneal contact lens for ophthalmic surgery

Info

Publication number: CN212466322U
Application number: CN202022093828.XU
Authority: CN
Inventors: 贾晓林; 刘庆淮; 王海林; 王晓宽; 曹德强; 孙洋; 谭恩鹏
Original assignee: Shanghai Kangende Medical Technology Co ltd
Current assignee: Shenyang Kangende Medical Science and Technology Co Ltd
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2021-02-05
Anticipated expiration: 2030-09-22

Abstract

The utility model discloses a corneal contact lens for ophthalmic surgery. A contact lens for ophthalmic surgery includes a lens body for covering a cornea and including a back surface in contact with the cornea and a front surface opposite the back surface, the lens body having a notch recessed radially inward from an edge and extending from the front surface through to the back surface, the notch configured to correspond to a corneal surgical incision. The utility model discloses a lens body sets up the breach in the edge, and the position and the size of breach all correspond with the corneal surgery incision, consequently surgical instruments can directly enter the incision through the breach and need not promote the corneal contact lens to make the corneal contact lens stably cover the cornea, keep the cornea moist and the operation field of vision clear all the time.

Description

Corneal contact lens for ophthalmic surgery

Technical Field

The utility model relates to the field of medical equipment, in particular to a corneal contact lens for ophthalmic surgery.

Background

During ophthalmic surgery, prolonged exposure of the cornea to air can lead to drying of the corneal epithelium resulting in turbid edema, i.e., iatrogenic corneal epithelial dysfunction. Meanwhile, the dryness and the turbidity of the cornea can affect the clarity of the operation visual field of an operator, thereby affecting the operation and even causing complications.

In order to solve the problem, the first solution adopted in the current clinical practice is to frequently apply physiological saline to the cornea by an assistant holding a syringe, but the frequent application of the physiological saline itself may cause a certain degree of influence on the corneal epithelium and further may cause corneal opacity of different degrees, thereby affecting the recovery of the function of the corneal epithelium and the vision after the operation. The second solution is to apply a keratoprotective agent to the cornea, which reduces the number of instillations compared to the first solution, but this method has disadvantages in that the keratoprotective agent can be lost with the lapse of the operation time, the operation is repeated for a long time, and edema and clouding of the corneal epithelium may be caused. A third method is used in vitrectomy surgery, where the cornea is covered with a contact lens. Covering the cornea with a corneal contact lens during the operation can well prevent the cornea from drying all the way and maintain the visual field clarity of the operation. The soft contact lens is easy to deform and affects the visual observation of an operator, so the hard contact lens has better effect.

In the cataract surgery process, the problem of corneal dryness also exists, because the surgical incision part or the whole of the cataract surgery is in the cornea, and the surgical incision has certain length, width and depth, if the corneal contact lens is adopted to cover the cornea, when the surgical instrument enters the incision, the incision can be upwards propped to a certain degree, and at the moment, the corneal contact lens can be pushed by the surgical instrument to shift, so that the aims of stably covering the cornea and keeping the cornea moist and the surgery visual field clear all the time can not be achieved. Other ophthalmic surgeries also have a problem that the cornea is exposed and dried, for example, combined cataract-vitreous cutting surgery, glaucoma surgery, combined glaucoma-cataract surgery, oblique amblyopia surgery, eye trauma surgery, and the like, and in all of these surgeries, the eyelid needs to be continuously opened, so that the cornea is exposed and dried for a long time.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a corneal contact lens for ophthalmic surgery to protect the cornea and maintain the visual field definition during the operation.

The utility model provides a corneal contact lens for ophthalmic surgery, include:

a lens body for covering a cornea and including a back surface in contact with the cornea and a front surface opposite the back surface, the lens body having a notch recessed radially inward from an edge and extending from the front surface to the back surface, the notch configured to correspond to a corneal surgical incision.

In some embodiments, the notch includes a notch edge on the front surface, the notch edge including first and second endpoints at the two ends, respectively, and a midpoint between the first and second endpoints, the notch edge being symmetric with respect to a radius line passing through the midpoint.

In some embodiments, the notched edge line is an arc extending from the first end point to the second end point.

In some embodiments, the nicked edge comprises a first edge segment extending radially from the first end point, a second edge segment extending radially from the second end point, and a third edge segment connected between the first edge segment and the second edge segment, wherein the third edge segment is a straight line or an arc.

In some embodiments, the third side line segment is an arc convex toward the edge of the front surface.

In some embodiments, the at least two indentations include a first indentation and a second indentation, the first indentation and the second indentation being located on respective sides of a center of the lens body.

In some embodiments, the area of one of the first and second indentations is greater than the area of the other indentation.

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

In some embodiments, the first notch comprises a first notch edge line located on the front surface and the second notch comprises a second notch edge line located on the front surface, wherein, in the radial direction, a linear distance from a midpoint of the first notch edge line to a primary edge line of the front surface located at the first notch is in the range of [1mm, 4mm ]; and/or the linear distance in the radial direction from the midpoint of the edge of the second notch to the primary edge line of the front surface at the second notch is in the range of [0.5mm, 3mm ].

In some embodiments, the first notch includes a first notch edge located on the anterior surface, the second notch includes a second notch edge located on the anterior surface, and a line connecting a midpoint of the first notch edge and a center of the anterior surface and a line connecting a midpoint of the second notch edge and the center of the anterior surface are in an angular range of [80 °, 120 ° ].

In some embodiments, the at least two indentations include a first indentation and a second indentation, the first indentation including a first indentation edge located on the front surface, the second indentation including a second indentation edge located on the front surface, the first indentation edge and the second indentation edge having the same shape.

In some embodiments, the at least two indentations include a first indentation and a second indentation, the first indentation and the second indentation being spaced apart; alternatively, the first and second indentations are interconnected.

In some embodiments, the sides of the notch include an arcuate surface; or at least two cambered surfaces are arranged on the side surface of the notch, and the at least two cambered surfaces are intersected.

In some embodiments, the angle between the sides and the front surface of the indentation is obtuse; and/or the angle between the sides and the rear surface of the indentation is obtuse.

In some embodiments, surgical reference markers are disposed on the anterior surface.

In some embodiments, the notch includes a notch edge line on the anterior surface, and the surgical reference mark includes an edge reference mark disposed along the notch edge line and the edge of the lens body with a midpoint of the notch edge line as a zero coordinate point.

In some embodiments, the surgical reference marks comprise astigmatic reference angle marks disposed circumferentially about a center of the lens body.

In some embodiments, the notch includes a first notch and a second notch, and the surgical reference mark includes an incision reference angle mark disposed along a second notch edge line of the second notch and representing an angle between a line between a point on the second notch edge line and a center of the lens body and a line between a midpoint of the first notch edge line and the center of the lens body.

In some embodiments, the surgical reference mark comprises a central reference line disposed on a circumference centered on the center of the lens body, wherein the central reference line is a mark circle continuously distributed along the circumference; alternatively, the central reference line comprises at least two pairs of marker line segments spaced circumferentially and oppositely disposed.

In some embodiments, the contact lens is cut from the lens body.

In some embodiments, the radius of curvature of the posterior surface of the lens body ranges from [7.8mm, 10.6mm ]; and/or the radius of curvature of the front surface of the lens body ranges from [7.8mm, 10.6mm ]; and/or the diameter of the lens body ranges from [11.5mm, 14.5mm ].

Based on the technical scheme provided by the utility model, this lens body sets up the breach in the edge, and the position and the size of breach all correspond with corneal surgery incision, consequently surgical instruments can directly enter the incision through the breach and need not promote the contact lens to make the contact lens stably cover the cornea, keep the cornea moist and the operation field of vision clear all the time.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a schematic perspective view of a contact lens according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a corneal contact lens according to another embodiment of the present invention;

FIG. 3 is an enlarged partial view of the notch of the contact lens of FIG. 2 in a sagittal section through the meridian of the lens body;

FIG. 4 is a sagittal sectional view through the meridian of the lens body of a notch of a contact lens according to another embodiment of the present invention;

FIG. 5 is an enlargement of a portion of the sagittal section of FIG. 4;

FIG. 6 is a schematic top view of the anterior surface of the contact lens of FIG. 2;

FIG. 7 is a schematic view of the front surface of a contact lens according to another embodiment of the present invention;

fig. 8 is a schematic view of the front surface of a corneal contact lens according to yet another embodiment of the present invention;

FIG. 9 is a schematic view of the front surface of a contact lens in accordance with an embodiment of the present invention;

FIG. 10 is a schematic view of the front surface of a contact lens in accordance with an embodiment of the present invention;

FIG. 11 is a schematic view of the front surface of a contact lens in accordance with an embodiment of the present invention;

FIG. 12 is a schematic view of the front surface of a contact lens in accordance with an embodiment of the present invention;

fig. 13 is a schematic view of the front surface of a contact lens according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously positioned and the spatially relative descriptors used herein interpreted accordingly.

In cataract surgery, a corneal incision needs to be made first, most doctors need to make two incisions, namely a main incision and a side incision, to complete the surgery, and part of doctors still use one incision to complete the surgery. The primary incision is the primary pathway for cataract extraction and subsequent lens implantation. Depending on the surgical procedure, the use of surgical instruments or instrument systems, and the implantation of the lens, main incisions of different sizes may be made during the procedure. The doctor who makes a single incision needs to complete the above two incisions through a larger incision, and is often referred to as a small-incision manual operation. When making an incision, the surgical channel formed by the knife passing from outside the cornea into the eye is also called a corneal tunnel. Other ophthalmic surgeries also have a problem that the cornea is exposed and dried, for example, combined cataract-vitreous cutting surgery, glaucoma surgery, combined glaucoma-cataract surgery, oblique amblyopia surgery, eye trauma surgery, and the like, and in all of these surgeries, the eyelid needs to be continuously opened, so that the cornea is exposed and dried for a long time.

In order to prevent the contact lens from being moved by being opened when a surgical instrument enters an incision in the above-described ophthalmic surgery, as shown in fig. 1, the contact lens for ophthalmic surgery according to an embodiment of the present invention includes a lens body 1, the lens body 1 being configured to cover a 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 recessed radially inward from an edge and penetrating from the front surface to the rear surface, the notch being configured to correspond to a corneal surgery incision.

This lens body 1 sets up the breach in the edge, and the position and the size of breach all correspond with corneal surgery incision, consequently surgical instruments can directly enter into the incision through the breach and need not promote the corneal contact lens to make the stable cornea that covers of corneal contact lens, keep the cornea moist and operate the field of vision clear all the time.

The lens body 1 of the present embodiment has at least one notch.

In the embodiment shown in fig. 1, a first notch 2 is formed in the lens body 1. The contact lens of this embodiment is suitable for ophthalmic surgery with only one incision.

In order to adapt to the main incision and the side incision in cataract surgery, in the embodiment shown in fig. 2, two notches, namely a first notch 2 and a second notch 3, are provided on the lens body 1, wherein the first notch 2 corresponds to the main incision and the second notch 3 corresponds to the side incision. And the first gap 2 and the second gap 3 are respectively arranged at two sides of the center of the lens body 1. The contact lens of the present embodiment is obtained by cutting the lens body 1. Before cutting, the circumferential primary edge line of the lens body 1 is circular, and fig. 1 and 2 show the primary edge line corresponding to the notch area portion by a dotted line. It should be further noted that the plurality of auxiliary lines extending outward from the center O of the lens body 1 in the radial direction in fig. 1 and 2 are drawn for the purpose of illustrating the curved surface of the outer surface of the lens body 1, and do not represent the presence of the plurality of auxiliary lines on the contact lens of the present application.

In other embodiments, more than three notches can be disposed on the lens body 1.

For example, in some complex cases, the surgeon needs to make more incisions to complete the surgery. For example, the pupil cannot be enlarged due to various reasons, which may obstruct the view of the operator, and sometimes the operator may use a retractor to hook the pupil edge to physically enlarge the pupil, and usually uses four retractors, which need to enter the eye through four small incision channels on the cornea. Contact lenses suitable for this type of procedure require more than two indentations, for example four or more.

As shown in fig. 2 and 3, the side surface of the notch of the present embodiment includes two intersecting arc surfaces. And the shape of a cross line formed by the intersection of the two cambered surfaces is similar to that of a notch side line. As shown in fig. 3, in a sagittal section through a meridian of the lens body 1, an angle α between the side surface and the front surface of the notch of the present embodiment is an obtuse angle. The angle beta between the sides and the rear surface of the indentation is obtuse. So set up and avoid breach to cause the damage to the cornea. Furthermore, the end points of the first notch sideline and the second notch sideline are also rounded to avoid damaging the cornea. In another embodiment, as shown in fig. 4 and 5, the sides of the notch of this embodiment include a curved surface. On a sagittal section through a meridian of the lens body 1, an angle α between the curved surface and the front surface of the lens body 1 is an obtuse angle. Also, the angle β between the curved surface and the rear surface of the lens body 1 is an obtuse angle. Specifically, the arc surface protrudes to the outside of the lens body 1. In other embodiments not shown in the drawings, the side surface of the notch may further include more than three arc surfaces, and the more than three arc surfaces intersect. As long as an obtuse angle is ensured between the side face and the front face and an obtuse angle is ensured between the side face and the rear face.

The size of the notch provided in the lens body 1 of the present embodiment is adapted to the size of the surgical incision, and the size of the surgical incision will be briefly described below. The main incision for phacoemulsification surgery is typically 1.5-3.2mm in length and 2-3mm in width, and a folded crystal is implanted. In the traditional small incision operation, an artificial lens made of hard materials is usually required to be implanted, so the size of the incision is not smaller than the diameter of the lens, the length of the incision of the main incision operation is 5.5-7mm, and the width of the incision is 2-4 mm. The side incision is made to assist the main incision in bimanual manipulation and is a passage for instruments to enter and exit, and is therefore generally smaller in size than the main incision. The length and width of the side incision of the ultrasonic emulsification operation are generally 0.5-2mm, the length of the side incision of the small incision operation is 2-4mm, and the width is 1.5-3 mm. In conclusion, the length range of the main incision of the cataract operation is generally 1.5-7mm at present, and the width range is generally 1-4 mm; the side cuts typically range in length from 1 to 4mm and in width from 0.5 to 3 mm.

In order to adapt to the size of the surgical incision, the first notch 2 and the second notch 3 of the present embodiment are different in size, specifically, if the first notch 2 corresponds to the main incision and the second notch 3 corresponds to the side incision, the area of the first notch 2 is larger than that of the second notch 3. The area here refers to the area of the area surrounded by the first notch edge line and the primary edge line of the lens body 1.

In clinic, most doctors have the dominant hand on the right hand and some doctors have the dominant hand on the left hand, and the two hands are different in cataract surgery in that the positions of the main incision and the side incision are opposite. Generally, the dominant hand is located on one side of the main incision and the non-dominant hand is located on the side incision. The relative positions of the first notch 2 and the second notch 3 are different according to the positions of the main notch and the side notch. That is, in some embodiments, the area of the first notch 2 is larger than the area of the second notch 3, and in 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 may be equal to the area of the second notch 3.

The notch of the present embodiment penetrates from the front surface to the rear surface, and the shape and size of the notch edge line on the front surface of the notch will be described in detail below.

The notched edge line of the present embodiment includes a first endpoint and a second endpoint at the two ends, respectively, and a midpoint between the first endpoint and the second endpoint. The straight-line distance between the first end point and the second end point is defined as an end point distance, and the distance between the middle point and the primary edge line is defined as a middle point distance. Specifically, as shown in fig. 2 and 6, the first notch edge of the first notch 2 includes a first end point a, a second end point B, and a midpoint C between the first end point a and the second end point B. The lens body 1 of this embodiment is circular, and an intersection point of a radius line passing through the midpoint C and a primary edge line of the lens body 1 is D. Similarly, a second notch edge line of the second notch 3 includes a first end point E, a second end point F and a middle point G, and an intersection point of a radius line passing through the middle point G and the primary edge line of the lens body 1 is H.

Since the length of the primary incision for cataract surgery is generally in the range of 1.5-7mm and the width thereof is generally in the range of 1-4mm, in order to avoid pushing the contact lens when the surgical instrument enters the incision, as shown in fig. 2 and 3, the end point distance L1 of the first notch edge line of the present embodiment is in the range of [2mm,8mm ]. The midpoint of the first notch edge in the radial direction is in the range of [1mm, 4mm ] from K1.

The side incision for cataract surgery generally ranges from 1-4mm in length and 0.5-3mm in width. In this embodiment, the distance L2 between the end points of the second notch edge line is in the range of [1mm,5mm ], and the distance K2 between the midpoint of the second notch edge line is in the range of [0.5mm, 3mm ] in the radial direction. The end point distance of the gap sideline of the embodiment is larger than the length of the corresponding incision so as to reserve a space to prevent the surgical instrument from pushing the corneal contact lens, and the gap is larger and can adapt to the flexible requirements of operators on different angle changes.

In the above range, the shape of the notch edge line may be any shape passing through three points, i.e., the two end points and the middle point. Such as arcuate, slotted, etc.

Preferably, the notch edge line is symmetrical with respect to a radius line passing through the midpoint. And in the corresponding radial direction, in the distance from any point on the edge line of the notch to the original edge line before the cutting of the lens body, the optimal design is carried out when the distance of the midpoint is the maximum distance. The notch edge lines shown in fig. 2 and 6, for example, are arcs which are convex in the direction of the center O of the lens body 1.

In this embodiment, the first notch edge line of the first notch 2 and the second notch edge line of the second notch 3 have the same shape. Also in the embodiments shown for example in fig. 6 to 11, the edges of the first and

second indentations

2,3 are both arcs.

In other embodiments not shown in the figures, the first and second indentations may also be shaped differently from each other, as long as the surgical instrument is allowed to enter the incision without pushing the contact lens.

Specifically, the first notch boundary of the present embodiment is an arc extending from the first end point a to the second end point B. Similarly, the second notch edge line of the present embodiment is also an arc line extending from the first end E to the second end F. The first notch edge line is symmetrical with respect to a radius line passing through its center C. The second notch edge line is symmetrical with respect to a radius line passing through the midpoint G thereof.

In another embodiment, the nicked edge comprises a first edge segment extending radially from the first end point, a second edge segment extending radially from the second end point, and a third edge segment connected between the first edge segment and the second edge segment, wherein the third edge segment is a straight line or an arc.

As shown in fig. 12, the first notch edge of the first notch 2 includes a first edge segment extending in a radial direction from the first end point a, a second edge segment extending in a radial direction from the second end point B, and a third edge segment connected between the first edge segment and the second edge segment, and the third edge segment is a straight line. That is, the first notch edge line of the present embodiment is formed by the other three sides of the rectangle with one less long side. The second notch 3 of the present embodiment has the same shape as the first notch 2 and has a different size.

As shown in fig. 13, unlike the embodiment shown in fig. 12, the third side line segment of the first notch edge line of the first notch 2 of the present embodiment is an arc line. And the arc is convex toward the edge of the front surface. Similarly, the second notch 3 of the present embodiment has the same shape and different size as the first notch 2.

The first notch 2 and the second notch 3 of the present embodiment are spaced apart from each other.

In other embodiments not shown in the figures, the first and second indentations may also be interconnected.

The main incision and the side incision of the cataract surgery are made in order to conveniently operate instruments by hands at the same time and finish the surgery by matching with each other. The mutual angle of the central radii of the two incisions is usually between 80 and 120 ° in clinical practice. When the angle is too small, the gravity center of the body moves backwards to be far away from the patient, the two hands are too close to each other, and the cornea tunnel can limit the matching of the two-hand instruments. When the angle is too large, the body gravity center of the operator needs to move forward to be closer to the patient, the two hands are too separated, the instrument is not easy to match, and the fatigue of the two arms is easily caused. The two-hand placement position of the same operator can be changed according to the change of the conditions of the two-eye position, the eyelid size, the orbital bone height and the like of different patients, so that the angle is usually a variable range rather than a fixed angle. A comfortable and durable surgical pose is very important for the surgeon.

In order to accommodate the mutual angulation between the aforementioned central radii of the main and side notches, the angle between the line connecting the midpoint C of the first notch edge and the center O of the front surface and the line connecting the midpoint G of the second notch edge and the center O of the front surface of the present embodiment is defined as a notch reference angle θ, which ranges from [80 °, 120 ° ].

After the incision is completed during cataract surgery, the surgeon will then complete the capsulorhexis procedure. Because the cataract to be removed in the operation is wrapped by the front and the back capsular sac, a doctor needs to tear a port above the front capsular sac to be used as a channel so as to remove the turbid crystal. The pocket mouth is typically 5.0-5.5mm in diameter and may just cover the edge of an intraocular lens implanted posteriorly in the pocket. Intraocular lens diameters are typically 5.5-6.0mm, with a maximum of up to 7.0 mm. Too small a capsular bag can wrap the crystal too tightly, and postoperative capsular bag shrinkage can cause problems such as crystal deviation. The too big bag of bag, then can't wrap up the crystal edge, the crystal is easily pulled out of the bag to further bring other problems. However, the doctor does not have a reference scale to complete the operation in the process of capsulorhexis, so that especially for beginners or doctors with less operation experience, the doctor cannot manufacture a capsular bag opening with a proper size.

Also, clinically, patients with corneal astigmatism greater than 0.75D need to implant an astigmatism-correcting intraocular lens. Implantation of an astigmatic lens requires placement of the astigmatic axis at the correct location. In the operation process, the horizontal position is marked on the cornea of a patient before an operation, and a 360-degree metal marking disc and a color marking pen are used for marking the position of the axis of the crystal and the position of the incision of the cornea during the operation. However, the nib of the marker pen is thick and therefore the angle of the marker is not precise. The marked points can also be faded or even disappear due to the washing of the liquid in the operation, so that the trouble of repeated marking is brought. At present, the axial position and the incision position of the astigmatic lens during surgery can be tracked and projected on the cornea through the combination of special equipment and a microscope, but the method needs separate equipment to provide surgical parameters and projection functions, has high requirements on the configuration of the microscope, and has certain time delay for the tracking function, so that the method can be realized only in a few conditional large ophthalmologic centers, and the basal layer cannot be used. Therefore, if the contact lens can be added with fine angle scale lines, the steps of using a metal marking ring and a marking pen in the operation can be omitted, the real-time angle indication in the operation process can be realized, the angle indication is more accurate, the infection risk possibly brought by the repeated operation of the metal marking disc and the marking pen is avoided, and the expensive operation equipment is not needed.

In order to facilitate the operator to accurately position the angle and position during the operation, the front surface of the lens body 1 of the present embodiment is further provided with an operation reference mark.

Specifically, as shown in fig. 7, the astigmatism reference angle mark 4 is provided on the front surface of the present embodiment. The astigmatism reference angle mark 4 is circumferentially arranged by taking the center O of the lens body 1 as a circle center and comprises an astigmatism reference angle scale mark and an astigmatism reference angle value. The astigmatism reference angle mark 4 is 90 ° above the cornea, 270 ° below the cornea, 0 ° on the left side, and 180 ° on the right side with reference to the patient's own body position. The astigmatic reference angle markers 4 facilitate the implantation and positioning of an astigmatic lens. The operation steps are simplified, the operation precision is increased, the operation can be carried out in real time, and meanwhile, the infection risk is reduced.

Specifically, the astigmatism reference angle scale line and the astigmatism reference angle value of 180-360 degrees are marked at the position which is more than 7mm away from the center O of the lens. The graduation marks are spaced at intervals of 1-5 degrees, and the angle values are spaced at intervals of 10-30 degrees. The length of the scale mark is 0.5-2.5mm, and different degree intervals can be distinguished through different line length. According to the actual marking condition of the lens, only scale marks are put, and angle numerical values are not put.

As shown in fig. 8, a notch reference angle mark 7 is disposed on the second notch side line of the second notch 3, and the notch reference angle mark 7 includes a plurality of notch reference angle scale lines and notch reference angle values disposed at intervals along the second notch side line, where the notch reference angle value refers to an included angle between a connection line between a point on the second notch side line and the center O of the lens body 1 and a connection line between a midpoint of the first notch side line and the center O of the lens body. The marking of the angle value of the reference angle of the incision is beneficial for an operator to determine the angles of the two incisions according to the reference, so as to better complete the operation.

Specifically, 1 to 5 notch reference angle tick marks and notch reference angle values may be provided along the second notch edge line. At intervals of 5-10 degrees. Wherein the direction of the scale lines points to the center O. When only one cut reference angle marker is marked, the marker is at the midpoint of the edge. When a plurality of marks are provided, the marks are symmetrical left and right with the midpoint as the center.

As shown in fig. 8, the mark of the notch further includes an edge reference mark 6 which takes the midpoint of the edge line of the notch as the zero point of the coordinate and is disposed along the edge line of the notch and the edge of the lens body. The edge reference marks 6 include edge reference tick marks and numerical values. The midpoint of the first notch edge line can be taken as the coordinate 0 point, providing an edge reference scale line and its numerical marks along the edge line and lens edge with a total length of 6-8 mm.

For example, scale lines and

numbers

1, 2,3 and 4 can be symmetrically marked on the left and right of the coordinate 0 point. The scale marks can be marked at 1.5, 2.5 and 3.5, and no numbers are marked. The length of the scale marks is 0.5-1.5mm, and the scale marks are kept parallel to the diameter of the 0 point.

As shown in fig. 8, the operation reference mark of the present embodiment includes a central reference line 5 disposed on a circumference centered on the center of the lens body 1. As shown in fig. 7, the central reference line 5 is a mark circle continuously distributed along the circumference. As shown in fig. 8, the center reference line 5 includes at least two pairs of mark line segments that are circumferentially spaced and oppositely disposed. The central reference line 5 serves as a positional reference line for the capsulorhexis, lens implantation and safe operating area.

The refractive index of the material of the lens body 1 of this embodiment is 1.4 to 1.7. Preferably, to reduce costs, the material of the lens body 1 is selected to be polymethyl methacrylate (PMMA).

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

The lens body 1 of the present embodiment is used for covering the cornea, and in order to make the lens body 1 cover the cornea better, the radius of curvature of the lens rear surface of the present embodiment ranges from [7.8mm, 10.6mm ]. The radius of curvature of the front lens surface is in the range [7.8mm, 10.6mm ]. The lens diameter ranged from [11.5mm, 14.5mm ]. The lens body 1 is sized larger than existing contact lenses, so that the lens body 1 can achieve better coverage of the cornea.

The structure of the contact lens of the embodiment shown in fig. 9 to 13 will be described in detail.

As shown in fig. 9, the contact lens includes a lens body 1, and two notches, namely a first notch 2 and a second notch 3, are disposed on the edge of the lens body 1. The notch sidelines of the first notch 2 and the second notch 3 are both arc lines, and the arc lines protrude towards the center of the circle of the lens. The end point distance of the first gap sideline of the first gap 2 is 4mm, and the midpoint distance is 2 mm. The second gap side line is also a similar arc line, the end point distance is 2mm, and the midpoint distance is 1 mm. The cut reference angle theta is 90 deg.. An edge reference mark is arranged on the side line of the first notch, and three groups of parallel scale marks of 0 point, 1.5mm, 2mm and 3mm are respectively marked. The corneal contact lens is used for an operator who has an included angle of 90 degrees fixed when being used to the operation of double handheld instruments, wherein the length of a main incision for the phacoemulsification operation is less than or equal to 4mm, the width of the main incision for the phacoemulsification operation is less than or equal to 2mm, the length of a side incision for the phacoemulsification operation is less than or equal to 2mm, and the width of the side incision for the phacoemulsification operation.

As shown in FIG. 10, the edge lines of the first notch 2 and the second notch 3 of the contact lens are both arc lines, and the arc lines are convex towards the center of the lens. Specifically, the distance between the end points of the first notch edge line of the first notch 2 is 8mm, and the distance between the middle points is 4 mm. The end point distance of the second gap sideline is 3mm, and the midpoint distance is 1.5 mm. Unlike the embodiment shown in fig. 4, the notch reference angle θ of the present embodiment is 80 °. The edge reference marks are respectively marked with four groups of parallel scale marks of 0 point and 1.5mm, 2mm, 3mm and 4 mm. The lens is suitable for the operation of a person who is used to the operation of double hand-held instruments and has an included angle of 80 degrees when the person is used to the operation of the double hand-held instruments, wherein the main incision manufacturing length of the small incision cataract operation is less than or equal to 6mm, the width of the main incision manufacturing length of the small incision cataract operation is less than or equal to 4mm, the side incision manufacturing length of the small incision.

As shown in FIG. 11, the edge lines of the first notch 2 and the second notch 3 of the contact lens are both arc lines, and the arc lines are convex towards the center of the lens. In contrast to the embodiment shown in fig. 4, the first notch edge of the contact lens has an end point distance of 7mm and a midpoint distance of 3 mm. The end point distance of the second gap sideline is 5mm, and the midpoint distance is 3 mm. The cut reference angle θ is 100 °. The central reference line 5 is three concentric circles of 5mm, 5.5mm, 6mm diameter. When the center line position of the notch vertex reference angle is set to 90 degrees, the 360-degree astigmatism reference angle is marked outside the 6mm central reference line 5, and the notch position cannot be marked on the 6mm reference line, the notch position can be moved inwards to the 5.5mm and 5mm central reference lines. This lens is applicable to main incision preparation length and is less than or equal to 7mm, and width less than or equal to 3mm, and side incision preparation length is less than or equal to 5mm, and width less than or equal to 3mm, contained angle are nimble changeable when two hands hold mechanical operation, and the art person who has scale and angle reference demand uses in the art.

As shown in fig. 12, the first notch 2 and the second notch 3 of the contact lens have the same shape, and are formed by the other three sides of the rectangle lacking one long side. The end point distance of the first gap sideline is 2mm, and the midpoint distance is 1 mm. The end point distance of the second gap sideline is 1mm, and the midpoint distance is 0.5 mm. The cut reference angle theta is 120 deg.. The 360 degree astigmatism reference angle is marked with the midline position of the incision reference angle theta as 90 deg., and the diameter of the formed 360 deg. ring is 8 mm. The lens is suitable for the main incision making length of the non-coaxial phacoemulsification operation of the cataract is less than or equal to 2mm, the width is less than or equal to 1mm, the side incision making length is less than or equal to 1mm, the width is less than or equal to 0.5mm, the lens is used by being used for an incision above a cornea, and an operator with a fixed included angle of 120 degrees when holding the mechanical operation with two hands implants an astigmatic crystal.

As shown in fig. 13, the shape of the first notch edge line is formed by connecting an arc line with a vertex pointing to the edge of the lens and two line segments which are symmetrical left and right, the distance between the endpoints of the lens is 4mm, and the distance between the vertices is 1.5 mm. The distance between the end points of the second sidelines is 4mm, and the distance between the top points of the second sidelines is 1.5 mm. The cut reference angle theta is 110 deg.. The 360-degree astigmatism reference angle is marked by taking the midline position of the incision reference angle theta as 90 degrees, the diameter of the formed 360-degree ring is 7mm, and 4 marking points are made corresponding to 0 degree, 90 degrees, 180 degrees and 270 degrees of the astigmatism reference angle. The lens is suitable for an operator who has a scale reference requirement and/or an astigmatic lens implantation requirement in an operation and has a main incision making length less than or equal to 4mm, a width less than or equal to 1.5mm, a side incision making length less than or equal to 4mm and a width less than or equal to 1.5mm, and an included angle relatively fixed at 110 degrees when two hands hold the mechanical operation.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.

Claims

1. A corneal contact lens for use in ophthalmic surgery, comprising:

a lens body (1) for covering a cornea and comprising a rear surface in contact with the cornea and a front surface opposite the rear surface, the lens body (1) having a notch recessed radially inwards from an edge and penetrating from the front surface to the rear surface, the notch being configured to correspond to a corneal surgical incision.

2. The contact lens for ophthalmic surgery of claim 1, wherein the notch comprises a notch edge line on the anterior surface, the notch edge line comprising a first end point and a second end point at the two ends, respectively, and a midpoint between the first end point and the second end point, the notch edge line being symmetric with respect to a radius line passing through the midpoint.

3. The contact lens for ophthalmic surgery of 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 of claim 2, wherein the notch edge comprises a first edge segment extending radially from the first end point, a second edge segment extending radially from the second end point, and a third edge segment connected between the first edge segment and the second edge segment, wherein the third edge segment is a straight line or an arc.

5. A corneal contact lens for ophthalmic surgery according to claim 4, wherein the third side line segment is an arc that is convex toward an edge of the anterior surface.

6. Contact lens for ophthalmic surgery according to any one of claims 1 to 5, the lens body (1) having at least two of said indentations.

7. Contact lens for ophthalmic surgery according to claim 6, characterized in that said at least two indentations comprise a first indentation (2) and a second indentation (3), said first indentation (2) and said second indentation (3) being located respectively on either side of the center of said lens body (1).

8. Corneal contact lens for ophthalmic surgery according to claim 7, characterized in that one of the first (2) and second (3) indentations has a larger area than the other indentation.

9. The contact lens for ophthalmic surgery according to claim 8, characterized in that the first notch (2) comprises a first notch edge line on the front surface and the second notch (3) comprises a second notch edge line on the front surface, wherein the linear distance between the two end points of the first notch edge line ranges from [2mm,8mm ]; and/or the linear distance between two end points of the second notch edge line ranges from [1mm,5mm ].

10. The contact lens for ophthalmic surgery according to claim 8, characterized in that the first notch (2) comprises a first notch edge line on the front surface and the second notch (3) comprises a second notch edge line on the front surface, wherein the linear distance in the radial direction from the midpoint of the first notch edge line to the primary edge line of the front surface at the first notch is in the range of [1mm, 4mm ]; and/or, in the radial direction, the linear distance from the midpoint of the second notch edge to the primary edge line of the front surface at the second notch is in the range of [0.5mm, 3mm ].

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

12. The contact lens for ophthalmic surgery according to claim 6, characterized in that the at least two indentations comprise a first indentation (2) and a second indentation (3), the first indentation (2) comprising a first indentation edge on the front surface, the second indentation (3) comprising a second indentation edge on the front surface, the first indentation edge and the second indentation edge having the same shape.

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

14. A contact lens for ophthalmic surgery as claimed in any one of claims 1 to 5, characterized in that the sides of the indentation comprise an arc; or the side surface of the notch comprises at least two cambered surfaces which are intersected.

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

16. A contact lens for ophthalmic surgery as claimed in claim 1, characterized in that surgical reference marks are provided on the front surface.

17. The contact lens for ophthalmic surgery of claim 16, characterized in that the notch comprises a notch edge line on the front surface, and the surgical reference mark comprises an edge reference mark (6) disposed along the notch edge line and the edge of the lens body with a midpoint of the notch edge line as a coordinate zero point.

18. Contact lens for ophthalmic surgery according to claim 16, characterized in that the surgical reference marks comprise astigmatic reference angle marks (4), the astigmatic reference angle marks (4) being arranged circumferentially centered on the center of the lens body.

19. Contact lens for ophthalmic surgery according to claim 16, characterized in that the notch comprises a first notch (2) and a second notch (3), the surgical reference mark comprises an incision reference angle mark (7), the incision reference angle mark (7) is arranged along a second notch edge line of the second notch (3) and represents an angle between a line between a point on the second notch edge line and the center of the lens body (1) and a line between a midpoint of the first notch edge line and the center of the lens body (1).

20. Contact lens for ophthalmic surgery according to claim 16, characterized in that said surgical reference markings comprise a central reference line (5) arranged on a circumference centered on the center of the lens body (1), wherein the central reference line (5) is a marking circle distributed continuously along the circumference; alternatively, the central reference line (5) comprises at least two pairs of marker line segments spaced apart and oppositely disposed on the circumference.

21. Contact lens for ophthalmic surgery according to claim 1, characterized in that it is cut out of the lens body (1).

22. The contact lens for ophthalmic surgery according to claim 1, characterized in that the radius of curvature of the rear surface of the lens body (1) ranges from [7.8mm, 10.6mm ]; and/or the front surface of the lens body (1) has a radius of curvature in the range [7.8mm, 10.6mm ]; and/or the diameter of the lens body (1) ranges from [11.5mm, 14.5mm ].