Keratoprosthesis support
A hydroxyapatite-coated metal scaffold with internal threads improves adhesion and biocompatibility, addressing detachment issues in corneal implants for secure surgical implantation and enhanced vision recovery.
Patent Information
- Application Number
- CN202421823310.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-07-30
AI Technical Summary
In the prior art, the biocompatibility of the artificial corneal stent and the maternal corneal tissue is poor, resulting in the shedding, dislocation and immune response of the stent material, and the adhesion strength between the stent and the artificial corneal is insufficient, affecting the surgical effect and patient comfort.
A medical metal bracket is used to form a hydroxyapatite layer on the surface. The material of the connecting ring is the same as that of the mirror column. The inner wall is equipped with internal threads. The support body and the connecting ring are fixed through an annular slot to ensure that they do not fall off during the operation, and biocompatibility is improved by similar or the same methods.
It improves the bonding strength between the stent and the artificial cornea, shortens the healing cycle, reduces the difficulty and risk of surgery, avoids the loss of the connecting ring, enhances biocompatibility, and reduces complications.
Smart Images
Figure CN223095678U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of in-vivo prosthesis implantation, and particularly relates to a stent for an artificial cornea. Background Art
[0002] An artificial cornea refers to a special refractive device made of artificial materials, which is used to replace the cloudy cornea that obstructs the optical path of the eyeball after disease, enabling patients to obtain a certain degree of vision. The artificial corneas provided by the prior art include a lens column and a stent.
[0003] Among them, as a medical device, the stent can support and stabilize corneal tissue, especially when the cornea is structurally damaged due to disease or trauma. This supporting effect helps to restore the normal shape and stability of the cornea, laying a foundation for subsequent vision restoration. In the artificial cornea implantation surgery, the stent plays a role in fixing the artificial cornea, ensuring its close fit with the surface of the eyeball and preventing displacement or detachment. This helps to improve the success rate of the surgery and the comfort of the patient.
[0004] The stents provided by the prior art have the following technical problems: the biocompatibility between the stent material and the maternal corneal tissue is poor, resulting in the inability of the two to achieve true healing. This is the root cause of many complications, such as the shedding and displacement of the stent material. The insufficient biocompatibility of the stent material may also trigger immune reactions or rejection reactions, further affecting the surgical effect and the comfort of the patient. The bonding strength between the stent and the chemical center area (usually the optical area) of the artificial cornea is insufficient, easily causing the separation of the two, affecting the overall structure and function of the cornea. Poor bonding may also lead to complications such as proliferative membranes after surgery, further affecting the vision restoration of the patient. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a stent for an artificial cornea, which is used to improve the bonding strength between the stent and the chemical center area of the artificial cornea, and at the same time, improve the biocompatibility between the stent and the maternal corneal tissue.
[0006] To achieve the above purpose, the utility model provides the following technical solutions:
[0007] The utility model provides a stent for an artificial cornea. The stent is a medical metal stent, including a stent body, a central mounting hole is formed through the stent body, a connecting ring is coaxially and vertically inserted into the central mounting hole, and internal threads are formed on the inner wall of the connecting ring; a hydroxyapatite layer is formed on the surface of the stent body; the material of the connecting ring is the same as or similar to the material of the lens column of the artificial cornea; the connecting ring is a hollow stepped shaft structure, and an annular clamping groove is formed at the corner of the stepped shaft. In the assembled state, the stent body is clamped into the annular clamping groove to prevent the connecting ring from shifting or falling off during the operation.
[0008] As a possible implementation, the stent body is a butterfly-shaped stent body or a vane-wheel type stent body.
[0009] As a possible implementation, the butterfly-shaped stent body has two symmetric fins; alternatively, the butterfly-shaped stent body has four symmetric fins.
[0010] As a possible implementation, each of the fins is provided with a weight-reducing through hole; a notch for facilitating suturing is provided on the side wall of each weight-reducing through hole.
[0011] As a possible implementation, each of the fins is provided with a needle hole for facilitating suturing.
[0012] As a possible implementation, the vane-wheel type stent body has at least three vanes that are equally spaced and have the same helix direction.
[0013] As a possible implementation, each of the vanes is provided with a weight-reducing through hole, and a notch for facilitating suturing is provided on the side wall of each weight-reducing through hole.
[0014] As a possible implementation, each of the vanes is provided with a needle hole for facilitating suturing.
[0015] As a possible implementation, the material of the connecting ring is at least one of hydroxyethyl polymethacrylate, polymethyl methacrylate, bioceramics or optical glass.
[0016] As a possible implementation, the material of the stent body is medical titanium metal.
[0017] In a second aspect, the present utility model further provides a stent for an artificial cornea. The stent is at least one of hydroxyethyl polymethacrylate, polymethyl methacrylate, bioceramics or optical glass; a central mounting hole is provided in the stent, and internal threads are provided on the inner wall of the central mounting hole.
[0018] Compared with the prior art, the present utility model has the following effects:
[0019] 1. The stent provided by the present utility model is sutured on the front surface of the eye membrane and combined with the rear disc of the lens column to realize the clamping of the cornea from the front and the back. In practical applications, no donor cornea is required, and the treatment of corneal blindness can be completed by one implantation surgery, shortening the surgical period;
[0020] 2. The stent is located on the front surface of the cornea, reducing the surgical difficulty and risk;
[0021] 3. By using a connecting ring made of the same material as the artificial cornea lens column and having internal threads on the inner wall, or by using a stent made of the same material as the lens column, damage to the lens column body during rotation can be avoided.
[0022] 4. The connecting ring is snapped into the central mounting hole of the metal bracket from front to back. A ring-shaped groove is provided at the outer wall shoulder of the hollow stepped shaft to prevent the connecting ring from falling off. At the same time, after the bracket rotates into place, the connecting ring and the metal bracket are not easily separated, that is, the falling of the connecting ring into the eyeball during the operation can be completely avoided.
[0023] 5. The medical titanium metal bracket has a hydroxyapatite coating layer to improve the healing property. Description of the Drawings
[0024] The drawings described herein are used to provide a further understanding of the present utility model and constitute a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.
[0025] Figure 1 It is a schematic structural diagram of the first medical titanium metal bracket provided by an embodiment of the present utility model;
[0026] Figure 2 It is a schematic structural diagram of the second medical titanium metal bracket provided by an embodiment of the present utility model;
[0027] Figure 3 It is a schematic structural diagram of the third medical titanium metal bracket provided by an embodiment of the present utility model;
[0028] Figure 4 It is a schematic structural diagram of the connecting ring provided by an embodiment of the present utility model;
[0029] Figure 5 It is a schematic structural diagram of the fourth medical non-metal bracket provided by an embodiment of the present utility model;
[0030] Figure 6 It is a schematic structural diagram of the fourth medical non-metal bracket provided by an embodiment of the present utility model
[0031] Figure 7 It is a schematic structural diagram of the fourth medical non-metal bracket provided by an embodiment of the present utility model.
[0032] Reference Numerals:
[0033] 1 - Bracket, 10 - Bracket Body, 100 - Notch, 101 - Pinhole, 11 - Connecting Ring, 110 - Ring-shaped Card Slot;
[0034] 2 - Bracket. Detailed Embodiments
[0035] For the convenience of clearly describing the technical solutions of the embodiments of the present utility model, in the embodiments of the present utility model, terms such as "first" and "second" are used to distinguish identical or similar items with basically the same functions and roles. For example, the first threshold and the second threshold are only used to distinguish different thresholds, and do not limit their sequence. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order, and "first", "second", etc. do not necessarily mean different.
[0036] It should be noted that in the present utility model, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present utility model should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.
[0037] In the present utility model, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are an "or" relationship. "At least one (item)" or similar expressions thereof refer to any combination of these items, including any combination of single item (s) or plural items (s). For example, at least one (item) of a, b or c can mean: a, b, c, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b and c, where a, b, c can be single or multiple.
[0038] See Figures 1 to 4 As shown in, an artificial cornea stent 1 is provided in an embodiment of the present utility model, including a stent body 10, a central mounting hole penetrating through the stent body 10, a connecting ring 11 coaxially and vertically inserted into the central mounting hole, and an internal thread is provided on the inner wall of the connecting ring 11; the stent body 10 is made of medical titanium metal, and a hydroxyapatite layer is formed on the surface of the stent body 10; the material of the connecting ring 11 is the same as or similar to that of the lens column; the connecting ring 11 is a hollow stepped shaft structure, and an annular slot 110 is provided at the corner of the stepped shaft. In the assembled state, the stent body 10 is inserted into the annular slot 110 to prevent the connecting ring 11 from shifting or falling off during the operation.
[0039] In order to shorten the healing period of the stent 1 and the cornea and improve the healing effect, a layer of hydroxyapatite can be formed on the surface of the stent body 10 by a plating process.
[0040] Structurally, the stent 1 can be a butterfly stent, a single-ring stent, a double-ring stent (with grid connecting pieces between the outer ring and the inner ring), or a mesh stent. Among them, the mesh stent facilitates the nutritional exchange between the anterior and posterior tissues.
[0041] Since the stent 1 needs to fit the anterior surface of the cornea, it needs to have a certain curvature to ensure that the stent 1 can completely fit on the anterior surface of the cornea. Moreover, the stent 1 needs to have a certain rigidity, that is, after the stent 1 is attached to the anterior surface of the cornea, it is not easily deformed or warped by force. The stent 1 also needs to have a certain flexibility. Since the corneal curvatures of different patients vary, the stent 1 with a certain flexibility can have a certain deformation space to adapt to corneas with different curvatures.
[0042] The stent body 10 is provided with a notch 100 or a pinhole 101 for convenient suture fixation. With such a setting, it is convenient to suture and fix the stent on the ocular surface. After the corneal radial side incision is sutured, the human cornea is fixed on the posterior surface of the cornea. After the stent moves to fit the anterior surface of the cornea, the stent is then sutured to the cornea using the notch or the pinhole.
[0043] Specifically, the stent body 10 is a butterfly stent body or a vane wheel type stent body. The butterfly stent body has two symmetrical fins; or, the butterfly stent body has four symmetrical fins. At this time, each fin is provided with a weight-reducing through hole; each side wall of the weight-reducing through hole is provided with a notch 100 for convenient suture. Or, each fin is provided with a pinhole 101 for convenient suture.
[0044] The vane wheel type stent body has at least three vanes distributed at equal intervals and with the same rotation direction. Each vane is provided with a weight-reducing through hole, and each side wall of the weight-reducing through hole is provided with a notch 100 for convenient suture. Or, each vane is provided with a pinhole 101 for convenient suture.
[0045] When the stent and the lens column are made of different materials but need to move relative to each other in a threaded connection manner, the metal stent body 10 will damage the threads of the lens column. The inner and outer threaded sections of the same material minimize the damage to each other during rotational movement when they undergo relative displacement changes. Moreover, the connecting ring is snapped into the central mounting hole of the stent from front to back. When the stent 1 is rotated towards the ocular surface during the operation, the connecting ring 11 will not fall off into the eye from the central mounting hole.
[0046] See Figures 5 to 7, the present utility model also provides another kind of stent 2 for artificial cornea. The stent is at least one of hydroxyethyl polymethacrylate, polymethyl methacrylate, bioceramics or optical glass. That is, the stent 2 adopts the same or similar material as the lens column for artificial cornea, and the stent 2 and the lens column can be directly connected without the above-mentioned connecting ring 11. That is, internal threads are provided on the inner wall of the central mounting hole of the stent. The structure of the stent 2 in this embodiment is the same as that of the stent 1 in the previous embodiment in other parts, and will not be elaborated here.
[0047] The outer peripheral dimensions of the above two types of stents are both 8.5 mm to 10 mm. For example, the outer peripheral dimensions of the stent are 8.5 mm, 9.0 mm, 9.5 mm or 10 mm.
[0048] The radius of curvature of the stent is 7.8 mm ± 2.0 mm. For example, the radius of curvature of the stent is 5.8 mm, 6.8 mm, 7.8 mm, 8.8 mm or 9.8 mm.
[0049] Although the present utility model has been described in conjunction with various embodiments herein, however, in the process of implementing the claimed present utility model, those skilled in the art can understand and implement other variations of the disclosed embodiments by viewing the drawings, the disclosure content, and the like. In the specification, the term "comprising" does not exclude other components or steps, and "a" or "one" does not exclude the case of multiple. A single processor or other unit can implement several functions listed in the specification. Certain measures are recited in different embodiments, but this does not mean that these measures cannot be combined to produce good results.
[0050] Although the present utility model has been described in conjunction with specific features and their embodiments, it is obvious that various modifications and combinations can be made without departing from the spirit and scope of the present utility model. Accordingly, this specification and the drawings are merely exemplary descriptions of the present utility model and are considered to have covered any and all modifications, variations, combinations or equivalents within the scope of the present utility model. Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the present utility model and its equivalent technologies, the present utility model also intends to include these changes and modifications.
Claims
1. A stent for an artificial cornea, characterized in that, The stent is a medical metal stent, including a stent body, a central mounting hole is formed through the stent body, a connecting ring coaxially and inserted into the central mounting hole from top to bottom, and an internal thread is formed on the inner wall of the connecting ring; A hydroxyapatite layer is formed on the surface of the stent body; the material of the connecting ring is the same as or similar to the material of the lens column of the artificial cornea; the connecting ring is a hollow stepped shaft structure, and an annular clamping groove is formed at the corner of the stepped shaft. In the assembled state, the stent body is clamped into the annular clamping groove to prevent the connecting ring from shifting or falling off during the operation.
2. The stent for artificial cornea according to claim 1, wherein The stent body is a butterfly-shaped stent body or a vane wheel-shaped stent body.
3. The stent for artificial cornea according to claim 2, wherein, The butterfly-shaped stent body has two symmetric fins; or, the butterfly-shaped stent body has four symmetric fins.
4. The artificial cornea stent according to claim 3, characterized in that A weight-reducing through hole is formed on each fin; a notch for facilitating suturing is formed on the side wall of each weight-reducing through hole.
5. The artificial cornea stent according to claim 3, wherein, A needle hole for facilitating suturing is formed on each fin.
6. The stent for artificial cornea according to claim 2, characterized in that, The vane wheel-shaped stent body has at least three vanes that are equally spaced and have the same helix direction.
7. The stent for artificial cornea according to claim 6, wherein, A weight-reducing through hole is formed on each vane, and a notch for facilitating suturing is formed on the side wall of each weight-reducing through hole.
8. The stent for artificial cornea according to claim 6, characterized in that, A needle hole for facilitating suturing is formed on each vane.
9. The artificial cornea stent according to claim 1, characterized in that, The material of the connecting ring is at least one of hydroxyethyl methacrylate, polymethyl methacrylate, bioceramics or optical glass; and / or, the material of the stent body is medical metal titanium.
10. A stent for an artificial cornea, characterized in that, The stent is at least one of hydroxyethyl methacrylate, polymethyl methacrylate, bioceramics or optical glass; a central mounting hole is formed in the stent, and an internal thread is formed on the inner wall of the central mounting hole.