CN114848292B - Interface unit for fixing eyeballs - Google Patents

Abstract

The invention discloses an interface unit for fixing the eyeball, which belongs to the technical field of vision correction surgical equipment. It includes: an interface main body that fixes the eyeball through negative pressure and a transparent body with refractive effect; the interface main body is in contact with the non-surgical area of the cornea, The transparent body is in contact with the corneal surgery area; the contact area between the bottom of the interface body and the cornea is an annular curved surface, and the projection of the annular curved surface in the direction of the visual axis is an elliptical ring. The long axis direction of the elliptical ring is the left-right swing direction of the patient's head; above the annular curved surface An annular groove is provided, and multiple support structures are provided in the annular groove. Negative pressure acts on the cornea through the multiple support structures to fix the cornea on the lower surface of the transparent body; an annular platform is provided above the annular groove for placing the transparent body. Make the patient as comfortable as possible to reduce the risk of water accumulation affecting laser processing during surgery, reduce the difficulty of laser scanning processing, and reduce the possibility of negative pressure desorption during surgery.

Description

An interface unit for fixing eyeballs

Technical field

The present invention belongs to the technical field of vision correction surgical equipment, and more specifically, relates to an interface unit for fixing the eyeball.

Background technique

Today, femtosecond laser myopia surgery technology is developing rapidly. Due to the high positioning accuracy of femtosecond laser pulses and short operation time, keeping the patient's eyeballs stationary during the operation is one of the key factors to ensure the accuracy of femtosecond laser surgery. For example, patent US 2001/0021844 A1 describes the annular structure for fixing the eyeball. Its barb-shaped structure causes patients to feel extreme discomfort during the operation, which is likely to cause the patient to have a stress reaction and cause the operation to fail.

Patent CN110234301A mentions a docking device that can adsorb the cornea to the platen. However, the device does not have an annular channel and cannot ensure that the eyeballs are evenly adsorbed on the platen. It cannot even prevent the cornea from wrinkling and blocking the suction channel. If the situation occurs, water or air may accumulate under the pressure plate. In the contact lens mentioned in the patent CN101282699B, the cornea is in a non-flattened state, which greatly increases the difficulty of laser scanning planning. At the same time, insufficient force on the eye can easily cause loss of adsorption during the operation.

These devices that connect to the eyeball only consider the structure of the eyeball and do not consider the shape of the eye. They all use circular contacts. After successful docking, the patient's eyelids need to be kept open, which greatly makes the patient feel uncomfortable and affects the patient's health. Femtosecond laser surgical precision.

Contents of the invention

In view of the shortcomings and improvement needs of the existing technology, the present invention provides an interface unit for fixing the eyeball to alleviate the patient's discomfort and reduce the possibility of negative pressure desorption caused by slight movement of the patient's head during surgery. .

In order to achieve the above object, the present invention provides an interface unit for fixing the eyeball, including: an interface body that fixes the eyeball through negative pressure and a transparent body with refractive effect; the interface body is in contact with the non-surgical area of the cornea, and the The transparent body is in contact with the corneal surgery area; the contact area between the bottom of the interface body and the cornea is an annular curved surface, and the annular curved surface is projected into an elliptical ring in the direction of the visual axis, and the long axis direction of the elliptical ring is when the patient's head swings left and right. direction; an annular groove is provided above the annular curved surface, a plurality of support structures are provided in the annular groove, and negative pressure acts on the cornea through the multiple support structures to fix the cornea on the lower surface of the transparent body; the annular groove An annular platform is set above the tank for placing the transparent body.

Furthermore, the contact area between the support structure and the cornea has an angular turn to prevent the cornea, the lower surface of the transparent body and the annular platform from forming a closed section.

Further, the support structure is connected to the upper wall of the annular groove or the lower wall of the annular groove.

Further, a suction channel connected to the annular groove is provided in the interface body.

Further, the outer wall of the suction channel has a pagoda structure.

Further, the lower surface of the transparent body is a plane or an aspherical surface with an extension line above the annular groove.

Furthermore, the side walls of the transparent body are frosted or attached with materials capable of absorbing light.

Generally speaking, through the above technical solutions conceived by the present invention, the following beneficial effects can be achieved:

(1) In the present invention, the contact area between the bottom of the interface body and the cornea is an annular curved surface, which matches the elliptical shape of the eye. The long axis direction of the projection of the annular curved surface in the direction of the visual axis is the left-right swing direction of the patient's head. This design can better The eyeball is fixed to the negative pressure structure, and it is not easy for the patient to escape from the negative pressure even if he slightly shakes his head from side to side during the operation. The curvature of the toroidal surface is similar to the curvature of the cornea, allowing the cornea to naturally fit into the patient interface. After the eyeballs are docked, the eye opening clip can even be removed, allowing the patient's upper and lower eyelids to naturally fit on the lower edge of the main shell of the interface, reducing the patient's discomfort.

(2) The contact area between the support structure and the cornea has an angular turning point to avoid water accumulation in the closed area formed by the cornea, the lower surface of the transparent body and the annular platform; because the water accumulation caused by this closed area cannot be effectively discharged through the suction channel, Therefore, the design of the present invention can ensure that when laser processing the cornea, the scanning trajectory is within the cornea rather than in the water, further improving the accuracy of laser processing and the success rate of surgery.

Description of drawings

Figure 1 is one of the structural schematic diagrams of an interface unit for fixing eyeballs provided by the present invention;

Figure 2 is the second structural schematic diagram of the interface unit for fixing eyeballs provided by the present invention;

Figure 3 is a schematic structural diagram of the interface unit in the patient's field of view provided by the present invention;

Figure 4 is a perspective schematic diagram of the interface unit provided by the present invention;

Figure 5 is one of the schematic diagrams of the transparent body provided by the present invention;

Figure 6 is the second schematic diagram of the transparent body provided by the present invention;

Figure 7 is one of the schematic diagrams of the contact between the interface unit provided by the present invention and the patient's cornea;

Figure 8 is the second schematic diagram of the contact between the interface unit provided by the present invention and the patient's cornea;

Figure 9 is a partial enlarged view of the annular groove and support structure provided by the present invention;

Figure 10 is a schematic diagram of the interface unit provided by the present invention coming into contact with the patient's cornea to produce water accumulation;

Figure 11 is a schematic diagram of the visual axis direction interface unit provided by the present invention acting on the patient's eyes;

In all drawings, the same reference numerals are used to represent the same elements or structures, where: 1-interface body; 2-transparent body; 3-cornea; 101-stiffening rib structure; 102-suction channel; 103- Pagoda structure; 104-annular groove; 104a-upper wall of annular groove; 104b-lower wall of annular groove; 105-support structure; 106-groove gap; 107-support gap; 108-contact surface between support structure and cornea; 109-annular platform; 110-bottom edge of interface body; 111-annular curved surface; 21-upper surface of transparent body; 22-side of transparent body; 23-lower surface of transparent body; 24-water accumulation; 25-imaginary extension of lower surface of transparent body Line; 31-eyelid.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

In the present invention, the terms "first", "second", etc. (if present) in the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

This embodiment provides an interface unit for fixing the eyeball, as shown in Figure 1, including: an interface body 1 that fixes the eyeball through negative pressure and a transparent body 2 with refractive effect. The processing materials of both can be photosensitive resin. , acrylic and medical materials, the transparent body 2 can also be a glass body with high light transmittance. The interface unit can shape the corneal surface so that the cornea and the lower surface of the transparent body fit together to fix the position of the cornea, which is convenient for laser eye surgery reference point positioning and corneal cutting.

Taking an aspherical transparent body as an example, Figures 2 to 4 show the detailed structure of the interface unit.

The interface body 1 includes a suction channel 102 and an annular groove 104 . There is a reinforcing rib structure 101 between the suction channel 102 and the shell of the interface body 1, which makes the connection between the suction channel 102 and the shell of the interface body 1 more stable, and the suction channel 102 is not easy to break in practical applications. The annular groove 104 is connected with the suction channel 102, and there is a support structure 105 in the annular groove 104. The support structure 105 is only connected to one of the annular groove upper wall 104a and the annular groove lower wall 104b, and can be Alternately connected, there is a groove gap 106 between the support structure 105 and the lower surface of the annular groove, but does not form a shape similar to a suction hole. The negative pressure acts on the cornea 3 through the plurality of supporting structures 105 to fix the cornea 3 to the lower surface 23 of the transparent body.

The contact surface 108 between the support structure and the cornea has an angular turn; the annular platform 109 in contact with the lower surface of the transparent body 23 has a certain thickness. The contact surface 108 between the support structure and the cornea has an angular turn to avoid the contact between the cornea 3 and the lower surface of the transparent body. 23 and an annular platform 109 with a certain thickness, resulting in the generation of water accumulation 24. This can ensure that the scanning trajectory is within the cornea and not in the water accumulation 24 when the laser is processing the cornea 3, thereby ensuring the accuracy of laser processing and surgical procedures. Success rate.

The contact area between the bottom of the interface body 1 and the cornea 3 is an annular curved surface 111. Due to the human eyelid, the surface of the human eye that actually contacts the air is an ellipsoid. It is also an ellipse when viewed in the direction of the visual axis. The long axis of the ellipse is The direction is consistent with the left and right swing of the patient's head. Therefore, the interface unit of the present invention can adsorb the eyes more easily and more firmly, and the slight movement of the patient's head during the operation will not easily cause negative pressure desorption, and the patient will also be comfortable. The force-bearing area of the patient's eyeball is the annular curved surface outside the surgical area. The eye opening clip can even be removed when the eyeballs are docked, allowing the patient's upper and lower eyelids to naturally fit on the lower edge of the patient interface housing.

It should be noted that the present invention is applicable when the eyeball structure is a sphere or an ellipsoid. Taking a sphere as an example, the annular curved surface described in the present invention can be understood as a curved surface obtained by intercepting the half of the sphere by using two arc curved surfaces. This curved surface has a shape similar to the top edge of a gold ingot; as shown in Figure 4, In the perspective view of the interface unit, the bottom edge 110 of the interface body is an arc with two ends low and a middle high. Taking the ellipsoid as an example, if the ellipse with its long axis on the x-axis and its short axis on the y-axis is rotated around the x-axis, the three-dimensional figure formed is an ellipsoid, and its surface is the ellipsoid surface. The annular curved surface described in the present invention can be understood as a curved surface obtained by intercepting the ellipsoid surface using the xy coordinate plane and a plane parallel to the xy coordinate plane. At this time, in the perspective schematic diagram of the interface unit, the bottom edge 110 of the interface body is a section. straight line. Of course, you can also use two arc surfaces to intercept the upper half of the ellipsoid to obtain a toroidal surface with a shape similar to the top edge of a gold ingot. In other words, as long as the projection of the intercepted annular curved surface in the visual axis direction is an elliptical ring, the present invention can be implemented.

Figure 5 and Figure 6 show the structure of the transparent body. The transparent body 2 is connected to the interface body 1 through glue or a sealing ring. The transparent body 2 divides the interface body 1 into two spaces, the upper and lower spaces. The upper space is used for the interface body. 1. Overall fixation, the lower space is used to fix the patient’s eyeballs. The upper surface 21 of the transparent body is a plane, and the lower surface 23 of the transparent body is a plane or aspherical surface. When the lower surface of the transparent body is aspherical, its equivalent curvature radius is slightly similar to the curvature radius of the front cornea surface but slightly larger than the curvature radius of the front corneal surface. . After the negative pressure is turned on, the cornea is adsorbed to the lower surface 23 of the transparent body, the transparent body 2 is in contact with the cornea 3 and the imaginary extension line 25 of the lower surface of the transparent body is above the annular groove 104 . The side surface 22 of the transparent body is frosted or attached with a material that can absorb light; after the negative pressure is turned on, the cornea 3 is adsorbed to the lower surface 23 of the transparent body, and the two fit together. During the operation, the contact surface between the cornea 3 and the lower surface 23 of the transparent body is used as the reference plane for path planning and laser cutting. The transparent body 2 has a certain refractive effect and can change the convergence state of the converged light beam.

Figures 7 and 8 show the state when the interface unit is in contact with the patient's cornea 3. The cornea 3 that needs to be laser processed is in full contact with the lower surface 23 of the transparent body. What is really in contact with the cornea 3 is the contact surface 108 between the support structure and the cornea. In part, the water or gas generated during the corneal adsorption process can be smoothly discharged through the suction channel without the cornea being easily deformed, thereby reducing the risk of surgical failure.

Figure 9 shows a partial enlarged view of the annular groove 104 and the support structure 105; Figure 10 shows a schematic diagram of the adsorption of the patient's cornea 3 to avoid air accumulation or water accumulation 24. The water accumulation 24 can be passed through multiple supports. The support gap 107 between the structures 105 is sucked out. The contact surface 108 between the support structure and the cornea has a curved or broken line angle change. The surface with a continuous and slowly changing angle is best like a rounded corner. The curvature of the contact surface 108 between the support structure and the cornea is equal to The corneal curvature is close to the best, which can greatly improve the patient's comfort during the eyeball fixation process. In practical applications, an interface unit similar to the corneal curvature can be customized based on parameters such as corneal curvature measured before surgery. During the laser processing process, air bubbles will appear inside the cornea. These air bubbles can be sucked out after the upper surface of the cornea is incised like water 24. This can reduce the damage to the unprocessed area caused by excessive accumulation of air bubbles in the corneal tissue. situation occurs.

Figure 11 is a schematic diagram of the visual axis direction interface unit acting on the patient's eye. Because the eyelid 31 is elliptical, and the surgical area to be performed is at the center of the ellipse, which is the center of the cornea 3, then the bottom edge of the interface body that fixes the eyeball during the surgery is 110 is in natural contact with the eyes. Even if the eye opening clip is removed, the patient's upper and lower eyelids can naturally fit on the bottom edge of the interface body 110, which greatly improves the patient's comfort and is conducive to the smooth success of the operation.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements, etc., made within the spirit and principles of the present invention, All should be included in the protection scope of the present invention.

Claims (6)

1. An interface unit for securing an eyeball, comprising: an interface main body (1) for fixing eyeballs through negative pressure and a transparent body (2) with refraction function;

the interface main body (1) is in contact with a non-operative area of the cornea (3), and the transparent body (2) is in contact with the operative area of the cornea (3);

the contact area between the bottom of the interface main body (1) and the cornea (3) is an annular curved surface (111) which is matched with the oval shape of eyes, so that the upper eyelid and the lower eyelid of a patient are naturally attached to the lower edge of the shell of the interface main body, and the discomfort of the patient is relieved; the projection of the annular curved surface (111) in the visual axis direction is an elliptical ring, and the long axis direction of the elliptical ring is the left-right swinging direction of the head of a patient;

an annular groove (104) is arranged above the annular curved surface (111), a plurality of supporting structures (105) are arranged in the annular groove (104), and negative pressure acts on the cornea (3) through the supporting structures (105) to fix the cornea (3) on the lower surface (23) of the transparent body;

an annular platform (109) is arranged above the annular groove (104) and is used for placing the transparent body (2);

the annular platform (109) contacting the lower surface (23) of the transparent body has a certain thickness, and the contact area of the supporting structure (105) and the cornea (3) has an angle turning so as to avoid the cornea (3), the lower surface (23) of the transparent body and the annular platform (109) from forming a sealed section.

2. Interface unit for fixation of an eyeball according to claim 1 characterised in that the support structure (105) is connected to the annular groove upper wall (104 a) or the annular groove lower wall (104 b).

3. Interface unit for fixation of an eyeball according to claim 1 characterized in that the interface body (1) is provided with a suction channel (102) communicating with an annular groove (104).

4. An interface unit for fixation of an eyeball according to claim 3 characterised in that the outer wall of the suction channel (102) is a pagoda structure (103).

5. Interface unit for fixation of an eyeball according to claim 1 characterised in that the lower surface (23) of the transparent body is planar or aspherical with an extension above the annular groove (104).

6. Interface unit for fixation of an eyeball according to claim 1 characterised in that the transparent side wall (22) is frosted or attached with a material capable of absorbing light.