阅读说明：本技术 一种ⅱ型领扣型人工角膜 (II-type collar button type artificial cornea ) 是由 翟嘉洁 翟舒平 于 2021-08-27 设计创作，主要内容包括：本发明提供了一种Ⅱ型领扣型人工角膜,包括带有光学镜柱的前板,所述光学镜柱外侧面环设有裙边,所述光学镜柱外侧面还环设有垫片,所述垫片位于所述前板与所述裙边之间,所述垫片与所述裙边贴合。采用本发明Ⅱ型领扣型人工角膜能够更好地夹紧眼睑,降低人工角膜的脱落率,能在眼内更好地固定。(The invention provides a II-type collar buckle type artificial cornea which comprises a front plate with an optical lens column, wherein a skirt edge is arranged on the outer side face of the optical lens column in a surrounding mode, a gasket is further arranged on the outer side face of the optical lens column in a surrounding mode and is located between the front plate and the skirt edge, and the gasket is attached to the skirt edge. The II-type neckline artificial cornea can better clamp eyelids, reduce the falling rate of the artificial cornea and better fix the artificial cornea in eyes.)

1. The utility model provides a II type neck knot type artificial cornea which characterized in that, is including the front bezel that has the optical lens post, optical lens post lateral surface encircles and is equipped with the shirt rim, optical lens post lateral surface still encircles and is equipped with the gasket, the gasket is located the front bezel with between the shirt rim, the gasket with the shirt rim laminating.

2. The type ii necklet keratoprosthesis of claim 1, wherein the length of the portion of the optic cylinder between the anterior plate and the spacer is 1.3-1.7 mm.

3. The type ii necklet keratoprosthesis of claim 1, wherein the anterior surface of the spacer is of convex curvature design and the posterior surface of the spacer is of concave curvature design, the posterior surface of the spacer engaging and adhering to the anterior surface of the skirt.

4. The type ii necklet keratoprosthesis of claim 1, wherein the outer ring of the spacer has a diameter equal to the diameter of the front plate.

5. The type ii necklet keratoprosthesis of claim 1, wherein the outer ring of the spacer has a diameter of 4.5 to 4.7mm, the inner ring of the spacer has a diameter of 3 to 3.5mm, the inner ring of the spacer has a thickness of 0.5 to 0.9mm, the distance between the inner ring and the outer ring of the front surface of the spacer in the direction of the center line of the spacer is 0.1 to 0.2mm, the spacer has a thickness of 0.6 to 1.0mm, and the skirt has a thickness of 0.6 to 1.0 mm.

6. The type ii necklet keratoprosthesis of claim 1, wherein the anterior surface of the anterior plate is convexly curved and the posterior surface of the anterior plate is planar, and the optic post is centrally located on the posterior surface of the anterior plate.

7. The type ii necklet keratoprosthesis of claim 1, wherein the anterior plate has a diameter of 4.5-4.7mm, the anterior plate has a distance of 0.5-0.7mm from the anterior surface edge and the posterior surface edge, and the optic cylinder has a diameter of 3.3-3.5 mm.

8. The type ii necklet keratoprosthesis of claim 1, wherein the front plate, optic post and skirt are of a unitary construction, and the front plate, optic post, skirt and spacer are all PMMA.

9. The type II necklet keratoprosthesis of claim 1, further comprising a back plate having a central hole matching the optical lens post, wherein an annular groove for engaging the back plate is formed at an end of the outer side surface of the optical lens post remote from the front plate, the skirt is disposed between the annular groove and the front plate, and the back plate has a plurality of side holes.

10. The type ii necklet keratoprosthesis of claim 9, wherein the back plate is a circular disc, the back plate has 16 side holes, the center of 8 of the 16 side holes is located on a first circumference, the center line of the first circumference coincides with the center line of the circular disc, and the distances between the centers of adjacent side holes among the 8 side holes are equal; the circle centers of the other 8 side holes in the 16 side holes are positioned on a second circumference, the center line of the second circumference is superposed with the center line of the disc, the circle center distances between the adjacent side holes in the 8 side holes are equal, and the diameters of the second circumference corresponding to the first circumference are not equal.

Technical Field

The invention relates to a II-type neckline-buckle type artificial cornea.

Background

The collarband type artificial cornea is suitable for patients with high risk of rejection in corneal transplantation. However, the type II keratoprosthesis is the only solution for patients with severe dry eye or the like who cannot undergo the neckline keratoprosthesis implantation. The type II artificial cornea does not have similar products at home at present, and is an important supplement to the neckline type artificial cornea, the Boston type II artificial cornea in the United states is designed according to the eye anatomical structure of European people, and the eyelid structure and eyelid thickness of the European people are greatly different from those of Chinese people.

Disclosure of Invention

The invention aims to provide a II-type necklet type artificial cornea. The II-type neckline artificial cornea is more suitable for the eyelids of Asians.

In order to realize the purpose, the technical scheme is as follows: the utility model provides a II type neck knot type keratoprosthesis, is including the front bezel that has the optical lens post, optical lens post lateral surface encircles and is equipped with the shirt rim, optical lens post lateral surface still encircles and is equipped with the gasket, the gasket is located the front bezel with between the shirt rim, the gasket with the shirt rim laminating.

In a preferred embodiment, the length of the portion of the optical lens column between the front plate and the spacer is 1.3 to 1.7 mm.

As a preferred embodiment, the front surface of the gasket is of convex curvature design and the rear surface of the gasket is of concave curvature design, the rear surface of the gasket being in close contact and bonded with the front surface of the skirt.

In a preferred embodiment, the outer ring of the spacer has the same diameter as the front plate.

As a preferred embodiment, the diameter of the outer ring of the gasket is 4.5 to 4.7mm, the diameter of the inner ring of the gasket is 3 to 3.5mm, the thickness of the inner ring of the gasket (the distance between the inner ring of the front surface and the inner ring of the rear surface of the gasket in the direction of the gasket center line) is 0.5 to 0.9mm, the distance between the inner ring of the front surface and the outer ring of the gasket in the direction of the gasket center line is 0.1 to 0.2mm, the thickness of the gasket (the distance between the inner ring of the front surface and the outer ring of the rear surface of the gasket in the direction of the gasket center line) is 0.6 to 1.0mm, and the thickness of the skirt (the distance between the inner ring of the front surface and the outer ring of the rear surface of the skirt in the direction of the skirt center line) is 0.6 to 1.0 mm.

In a preferred embodiment, the front surface of the front plate is of convex curvature design, the rear surface of the front plate is flat, and the optic post is centrally located on the rear surface of the front plate.

In a preferred embodiment, the front plate has a diameter of 4.5 to 4.7mm, the front surface edge of the front plate is spaced from the rear surface edge by a distance of 0.5 to 0.7mm, and the optic cylinder has a diameter of 3.3 to 3.5 mm.

In a preferred embodiment, the front plate, the optic column and the skirt are of a one-piece structure, and the front plate, the optic column, the skirt and the gasket are all made of PMMA (polymethyl methacrylate).

As a preferable embodiment, the optical lens column further comprises a rear plate with a middle hole matched with the optical lens column, an annular groove used for clamping the rear plate is annularly arranged at one end, far away from the front plate, of the outer side surface of the optical lens column, the skirt edge is located between the annular groove and the front plate, and a plurality of edge holes are formed in the rear plate.

As a preferred embodiment, the rear plate is a circular disc, 16 side holes are arranged on the rear plate, the centers of 8 side holes of the 16 side holes are located on a first circumference, the center line of the first circumference coincides with the center line of the circular disc, and the distances between the centers of adjacent side holes of the 8 side holes are equal; the circle centers of the other 8 side holes in the 16 side holes are positioned on a second circumference, the center line of the second circumference is superposed with the center line of the disc, the circle center distances between the adjacent side holes in the 8 side holes are equal, and the diameters of the second circumference corresponding to the first circumference are not equal.

Has the advantages that:

the II-type collar buckle type artificial cornea is obtained by adding the gasket on the basis of the American II-type artificial cornea sheet type, and the II-type collar buckle type artificial cornea can better clamp the eyelids, reduce the falling rate of the artificial cornea and better fix the artificial cornea in eyes.

Drawings

FIG. 1 is a schematic structural view of a type II necklet keratoprosthesis according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an embodiment of the back plate of the present invention.

In the figure: 1. front plate, 2, optic cylinder, 3, skirt, 4, gasket, 5, front surface of gasket, 6, front surface of skirt, 7, rear surface of skirt, 8, front surface of front plate, 9, rear surface of front plate, 10, rear plate, 11, middle hole of rear plate, 12, annular groove, 13, side hole, 14, circular ridge.

Detailed Description

To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.

As shown in fig. 1, a type ii collar-buckle type keratoprosthesis comprises a front plate 1 with an optical lens column 2, a skirt 3 is annularly arranged on the outer side surface of the optical lens column 2, a gasket 4 is also annularly arranged on the outer side surface of the optical lens column 2, the gasket 4 is located between the front plate 1 and the skirt 3, and the gasket 4 is attached to the skirt 3. Due to the existence of the gasket, the gap between the front plate 1 and the skirt 3 is reduced, so that the operation mode is changed, the Boston II type artificial cornea needs to be fixed through the eyelid, and the II type necklet type artificial cornea does not need to open the eyelid when being used, and only one auricular cartilage or conjunctiva flap needs to be filled in the artificial cornea.

By providing the spacer 4, the length (L1-L3) of the portion of the optical lens column 2 between the front plate 1 and the spacer 4 is preferably 1.3-1.7 mm. L1 is the distance between the rear surface 9 of the front plate 1 and the outer ring of the front surface 5 of the spacer 4 in the direction of the center line of the spacer 4, and L3 is the distance between the inner ring of the front surface 5 of the spacer 4 and the outer ring in the direction of the center line of the spacer 4.

For better fit with the skirt, the front surface 5 of the gasket 4 is of convex curvature design and the rear surface of the gasket 4 is of concave curvature design, the rear surface of the gasket 4 fitting and adhering to the front surface 6 of the skirt 3.

Preferably, the diameter of the outer ring of the spacer 4 is the same as the diameter of the front plate 1.

Preferably, the diameter of the outer ring of the gasket 4 is 4.5-4.7mm, the diameter of the inner ring of the gasket 4 is 3-3.5mm, the thickness of the inner ring of the gasket 4 (the distance between the inner ring of the front surface 5 and the inner ring of the rear surface of the gasket 4 in the direction of the center line of the gasket 4) is 0.5-0.9mm, the distance L3 between the inner ring of the front surface 5 and the outer ring of the gasket 4 in the direction of the center line of the gasket 4 is 0.1-0.2mm, the thickness of the gasket 4 (the distance between the inner ring of the front surface 5 and the outer ring of the rear surface of the gasket 4 in the direction of the center line of the gasket 4) (L3+ L2) is 0.6-1.0mm, and the thickness of the skirt 3 (the distance between the inner ring of the front surface 6 and the outer ring of the rear surface 7 of the skirt 3 in the direction of the center line of the gasket 3) is 0.6-1.0 mm. L2 is the distance between the outer ring of the front surface 5 and the outer ring of the rear surface of the gasket 4 in the direction of the gasket 4 centerline.

Generally, the front surface 8 of the front plate 1 is of convex curvature design, the rear surface 9 of the front plate 1 is flat, and the optic cylinder 2 is located in the center of the rear surface 9 of the front plate 1.

Preferably, the diameter d1 of the front plate 1 is 4.5-4.7mm, the distance L4 between the edge of the front surface 8 and the edge of the back surface 9 of the front plate 1 is 0.5-0.7mm, and the diameter of the optical lens column 2 is 3.3-3.5 mm.

Generally, the front plate 1, the optic column 2 and the skirt 3 are of a one-piece structure, and the material of the front plate 1, the optic column 2, the skirt 3 and the gasket 4 is PMMA (polymethyl methacrylate). Preferably, the front plate 1, the optic column 2, the skirt 3 and the gasket 4 are all made of medical PMMA (polymethyl methacrylate).

As shown in fig. 2, the ii-type collar-buckle artificial cornea further includes a back plate 10 having a central hole 11 matching the optical lens column 2, an annular groove 12 for clamping the back plate 10 is annularly provided at one end of the outer side surface of the optical lens column 2, which is far away from the front plate 1, the skirt 3 is located between the annular groove 12 and the front plate 1, and the back plate 10 is provided with a plurality of side holes 13. The edge holes are provided to facilitate the penetration of aqueous humor.

Further, the rear plate 10 is a circular disc, 16 edge holes 13 are arranged on the rear plate 10, the centers of 8 edge holes of the 16 edge holes 13 are located on a first circumference, the center line of the first circumference is overlapped with the center line of the circular disc, and the distances between the centers of adjacent edge holes of the 8 edge holes are equal; the circle centers of the other 8 side holes in the 16 side holes are positioned on a second circumference, the center line of the second circumference is superposed with the center line of the disc, the circle center distances between the adjacent side holes in the 8 side holes are equal, and the diameters of the second circumference corresponding to the first circumference are not equal. Preferably, the diameter corresponding to the first circumference is 4.7-4.9mm, the diameter corresponding to the second circumference is 6.55-6.85mm, the diameters of the 16 side holes 13 are all 1.0-1.2mm, and an included angle between connecting lines formed by the circle centers of two adjacent side holes on the first circumference and the second circumference and the circle center of the middle hole of the rear plate is 22.5 °.

Preferably, the inner diameter of the rear plate 10 is 2.7-2.9mm, and the outer diameter of the rear plate 10 is 8.4-8.6 mm.

Generally, the rear plate 10 is an arc-shaped disk, and both front and rear surfaces of the rear plate 10 are arc-shaped.

Preferably, the arc radius of the front surface of the rear plate 10 is 7.75mm, the arc radius of the rear surface of the rear plate 10 is 7.9-8.1mm, an arc transition is adopted between the front surface and the rear surface of the rear plate 10, the arc radius of the arc between the front surface and the rear surface of the rear plate 10 is 0.12-0.15mm, and the thickness of the rear plate 10 (the distance between an inner ring on the rear surface of the rear plate 10 and an outer ring on the front surface in the direction of the center line of the rear plate 10) is 1.25-1.35 mm.

Further, a circular ridge 14 is arranged on the rear plate 10, and the center line of the circular ridge 14 is overlapped with the center line of the rear plate 10.

Preferably, the inner diameter of the circular ridge 14 is 2.7-2.9mm, the outer diameter of the circular ridge 14 is 3.35-3.65mm, and the thickness of the circular ridge 14 is 0.25-0.45 mm.

Typically, the backplate 10 is a medical titanium disk and the raised circular ridge 14 is a metal ridge.

The invention relates to a using method of a II-type collar button type artificial cornea, which comprises the following steps:

(1) preparing auricular cartilage: a15 mm vertical skin incision was made at the upper and back 1/4 of the ipsilateral ear and the subcutaneous tissue was dissected to expose the cartilage. Then, 12X 10mm of ear cartilage was collected for later use.

(2) Corneal stroma and scleral surface exposure: conjunctival tissue was separated leaving the corneal and scleral tissues completely exposed 5mm from the limbus, which was used for subsequent corneal surgery and vitrectomy. In patients with conjunctival sac limitation, conjunctival tissue should be retained as much as possible, otherwise conjunctival sac reconstruction will be performed with the oral mucosa.

(3) The invention relates to the assembly of II-type collar button artificial cornea: donor corneal epithelium was excised, and a corneal button (corneal button diameter 8.5-9.0mm) (usually donor cornea 0.5-1.0mm larger than the recipient bed) having a central hole of 3mm in diameter was prepared as donor cornea by trephine. When using autologous cornea, a corneal button with a central hole of 2.75mm in diameter (corneal button diameter of 8mm) is suitable for implantation. The donor cornea is mounted to the optic cylinder 2 between the skirt 3 and the annular groove 12, and the backplate 10 is mounted to the annular groove 12.

(4) Implantation of the type II neckline keratoprosthesis of the present invention: the host cornea is trepanned and the lens removed if necessary. Anterior vitrectomy was performed by the vitrectomy planectomy (PPV) and 25G systems. Meanwhile, clinical evaluation was performed on the fundus (including the macula and optic disc). Like standard penetrating keratoplasty, the assembled type II collar-clasping keratoprosthesis device is intermittently sutured to the bed. Ahmed Glaucoma Drainage Devices (GDDs) may be implanted simultaneously, based on glaucoma diagnosis and post-operative prognosis.

(5) Cartilage reinforcement: autologous auricular cartilage was trimmed to the desired shape to fit the ocular surface and a hole 3mm in diameter was drilled in the center to secure the column. A radial incision is made on the autologous auricular cartilage to wrap the lens column, and then the incision is closed by suturing. Thereafter, the cartilage was further secured to the ocular surface using 7-0 sutures. To achieve better results, it is proposed to cover the margin of the auricular cartilage with a heterogeneous corneoscleral ring, which is further sutured to the patient's sclera.

(6) The fascial sac and conjunctiva are sutured layer by layer to further cover and reinforce the cartilage. If the conjunctival sac is insufficient, the eyelid skin without the eyelid plates may be used, with the keratoprosthesis columns protruding through the closed eyelid skin.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.