Deep lamellar corneal transplantation operation separator

Abstract

The utility model discloses a deep lamellar corneal transplantation operation separator, and relates to the technical field of corneal transplantation, the deep lamellar corneal transplantation operation separator comprises a needle tube, the needle tube is provided with a connecting needle head, the connecting needle head comprises a first needle head, a second needle head, a third needle head and a fourth needle head, the first needle head is provided with a first beveling body, and the second needle head is provided with a second beveling body. The first needle head is provided with a first beveled body, the second needle head is provided with a second beveled body, the third needle head is provided with a third beveled body, the fourth needle head is provided with a fourth beveled body, ports of the second beveled body and the fourth beveled body are round and blunt, ports of the first beveled body and the third beveled body are sharp tips, and ports of the second beveled body and the fourth beveled body are sharp tips. And the orientations of the first beveled body, the second beveled body, the third beveled body and the fourth beveled body are opposite. The length of the beveled surfaces of the first beveled bodies on the first needle head and the third needle head is shortened to be less than half of the existing length, so that the length of the beveled surfaces is shortened, and the risk of accidentally injuring surrounding tissues is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of corneal transplantation, in particular to a separator for deep lamellar corneal transplantation surgery. Background Art

[0002] Deep lamellar keratoplasty is a new corneal transplantation method, which involves transplanting a healthy donor cornea with the Descemet's membrane and endothelium removed to a corneal implant bed with all the stroma removed. The thickness of the underlying implant bed is about 20 μm. This surgery overcomes the problems of many complications of penetrating keratoplasty and has similar optical effects to penetrating keratoplasty, so it has been promoted worldwide. Ophthalmologists at home and abroad have paid full attention to deep lamellar keratoplasty, but many doctors have encountered difficulties in learning and performing this surgery.

[0003] However, during the implementation of the above technical solution, it was found that there were at least the following technical problems:

[0004] 1. The existing needle has a long bevel, which results in a long puncture stroke. For the corneal stroma with only about 200 μm left at the bottom layer, the existing needle bevel length exceeds 1 mm, which can easily penetrate the cornea in its entirety, causing corneal perforation, making the surgical operation difficult and the puncture process high risk;

[0005] 2. The existing corneal lamellar keratoplasty knife is a product of the lamellar keratoplasty era. The underlying cornea left by lamellar keratoplasty is relatively thick, and the precision requirements of the scalpel are relatively low. Therefore, in deep lamellar keratoplasty, it is difficult to start the matrix excision for the extremely thin underlying corneal stroma;

[0006] 3. Common complications during deep lamellar keratoplasty are corneal perforation and Descemet's membrane rupture. When the large bubble technique cannot form a large bubble in front of the Descemet's membrane, or when the large bubble gas is exposed, the posterior corneal stroma window formed by manual peeling to the Descemet's membrane is narrow, and existing instruments are difficult to enter the cavity in front of the Descemet's membrane. Using scissors or sharp tips can easily cause Descemet's membrane rupture. Utility Model Content

[0007] 1. Technical issues to be resolved

[0008] In view of the deficiencies in the prior art, the utility model provides a separator for deep lamellar keratoplasty surgery, which solves the problem that the beveled surface of the existing needle is relatively long, resulting in a longer puncture stroke during the puncture process. For the corneal stroma with only about 200 μm left in the bottom layer, the beveled surface length of the existing needle exceeds 1 mm, which easily leads to full-thickness puncture of the cornea and causes corneal perforation.

[0009] (II) Technical solution

[0010] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0011] A separator for lamellar keratoplasty surgery comprises a needle tube, on which a connecting needle is provided, and the connecting needle comprises a first needle, a second needle, a third needle and a fourth needle, wherein the first needle is provided with a first bevel, the second needle is provided with a second bevel, the third needle is provided with a third bevel, and the fourth needle is provided with a fourth bevel, the ports of the second bevel and the fourth bevel are both blunt-shaped, the ports of the first bevel and the third bevel are both sharp-pointed, the first bevel, the second bevel and the third and fourth bevels face in opposite directions, the bevel angle thresholds of the first bevel, the second bevel, the third bevel and the fourth bevel are all 30°-45°, and the bending angle thresholds of the first bevel, the second bevel, the third bevel and the fourth needle are between 120°-150°.

[0012] Preferably, the diameter threshold of the outer side walls of the first needle, the second needle, the third needle and the fourth needle is 0.3 mm-0.5 mm.

[0013] Preferably, the length threshold of the bent parts of the first needle, the second needle, the third needle and the fourth needle is 1 mm-3 mm.

[0014] (III) Beneficial effects

[0015] 1. This device shortens the length of the bevel of the first bevel on the first needle and the third needle to less than half of the existing length. When the bevel of the first bevel on the connecting needle is relatively long, the puncture process is longer. This application shortens the length of the bevel, reduces the risk of accidental injury to surrounding tissues, ensures that the gas injection process is safer and more reliable, reduces the risk of penetrating the cornea, and can more conveniently and flexibly peel off the lamellar matrix.

[0016] 2. The device is provided with a second needle and a fourth needle, the ends of which are rounded and blunt and have a small diameter, so that the ends of the connected needles can be easily inserted into the posterior corneal stroma window where the posterior elastic layer has been exposed. The rounded and blunt ports will not damage the posterior elastic layer, and the device has good safety. In addition, the needle can be directly connected thereto to inject viscoelastic agents such as sodium hyaluronate to create a surgical space.

[0017] 3. The device is provided with a first bevel body and a third bevel body facing different directions, and a second bevel body and a fourth bevel body facing different directions. The user can select a suitable connecting needle for surgical use according to the needs of the operation and the habit of using the tool, thereby improving the user's flexibility in selecting and using the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings.

[0019] Figure 1 This is a structural diagram of the surgical separator needle tube of the utility model;

[0020] Figure 2 This is a structural diagram of the connection needle of the utility model;

[0021] Figure 3 This is a structural diagram of the first needle and the second needle of the utility model;

[0022] Figure 4 This is a structural diagram of the third needle and the fourth needle of the utility model;

[0023] Figure 5 It is a structural diagram of the first beveled body and the second beveled body of the utility model;

[0024] Figure 6 It is a structural diagram of the third beveled body and the fourth beveled body of the utility model.

[0025] Legend: 1. needle tube; 2. connecting needle; 21. first needle; 22. second needle; 23. third needle; 24. fourth needle; 25. first beveled body; 26. second beveled body; 27. third beveled body; 28. fourth beveled body. DETAILED DESCRIPTION

[0026] The embodiment of the present application provides a separator for deep lamellar keratoplasty surgery, which effectively solves the problem that the bevel of the existing needle is long, resulting in a long puncture stroke during the puncture process. For the corneal stroma with only about 200 μm left in the bottom layer, the bevel length of the existing needle exceeds 1 mm, which is easy to pierce the entire layer of the cornea and cause corneal perforation. The present device shortens the bevel length of the first bevel on the first needle and the third needle to less than half of the existing length. When the bevel of the first bevel on the connecting needle is relatively long, the puncture process stroke is long. The present application shortens the bevel length, reduces the risk of accidental injury to surrounding tissues, ensures that the gas injection process is safer and more reliable, reduces the risk of penetrating the cornea, and can more conveniently and flexibly peel the lamellar stroma.

[0027] Example

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6The technical solution in the embodiment of the present application is effective. The length of the beveled surface of the existing needle is relatively long, resulting in a longer puncture stroke during the puncture process. For the corneal stroma with only about 200 μm left at the bottom layer, the beveled surface length of the existing needle exceeds 1 mm, which is easy to pierce the cornea through the entire layer, causing technical problems such as corneal perforation. The overall idea is as follows: a deep lamellar keratoplasty separator includes a needle tube 1, a connecting needle 2 is provided on the needle tube 1, and the connecting needle 2 includes a first needle 21, a second needle 22, a third needle 23 and a fourth needle 24. The first needle 21 is provided with a first beveled body 25, and the second needle 22 is provided with a first beveled body 26. A second bevel 26 is provided, a third bevel 27 is provided on the third needle 23, and a fourth bevel 28 is provided on the fourth needle 24. The values ​​of the bevels in the existing connecting needle 2 are different according to different models, and the threshold of the bevel length is about 2.32mm-2.59mm. In the present application, the bevel lengths of the first bevel 25 and the third bevel 27 are shortened to less than half of the existing lengths. When the bevels on the connecting needle 2 are relatively long, the puncture process is relatively long. The present application shortens the bevel length, reduces the risk of accidental injury to surrounding tissues, ensures that the gas injection process is safer and more reliable, and reduces the risk of penetrating the cornea.

[0029] The ports of the first bevel body 25 and the third bevel body 27 are both sharp tips, and their diameters are small and their bevels are short, so they can more conveniently and flexibly peel off the lamellar stroma and are not easy to penetrate the full-thickness corneal tissue;

[0030] The ports of the second bevel body 26 and the fourth bevel body 28 are both rounded and blunt, and have a small diameter, so that the ends can be easily inserted into the posterior corneal stroma window where the posterior Descemet's membrane has been exposed. The rounded and blunt ports will not damage the posterior Descemet's membrane, and have good safety. The needle tube 1 can be directly connected through the ports to inject viscoelastic agents such as sodium hyaluronate to separate the posterior corneal stroma from the posterior Descemet's membrane, thereby creating a surgical space for cutting off the posterior corneal stroma.

[0031] The first bevel bodies 25, the second bevel bodies 26, the third bevel bodies 27, and the fourth bevel bodies 28 are oriented in opposite directions. The bevel angle thresholds of the first bevel bodies 25, the second bevel bodies 26, the third bevel bodies 27, and the fourth bevel bodies 28 are all 30°-45°. The bending angle thresholds of the first needle 21, the second needle 22, the third needle 23, and the fourth needle 24 are between 120°-150°. The diameter threshold of the side wall is 0.3mm-0.5mm, the length threshold of the bending part of the first needle 21, the second needle 22, the third needle 23 and the fourth needle 24 is 1mm-3mm, the first bevel 25, the second bevel 26 and the third bevel 27, the fourth bevel 28 are in opposite directions, and the user can choose a suitable connecting needle 2 for surgical use according to the needs of the operation and the habit of using the tool, which improves the user's flexibility in selecting and using the tool.

[0032] In view of the problems existing in the prior art, the utility model provides a separator for deep lamellar keratoplasty surgery. The device shortens the length of the beveled surface of the first beveled body 25 on the first needle 21 and the third needle 23 to less than half of the existing length. When the bevel of the first beveled body 25 on the connecting needle 2 is relatively long, the puncture process is relatively long. The utility model shortens the length of the beveled surface, reduces the risk of accidental injury to surrounding tissues, ensures that the gas injection process is safer and more reliable, reduces the risk of penetrating the cornea, and can more conveniently and flexibly peel off the lamellar matrix.

[0033] Working principle:

[0034] The first step, deep lamellar keratoplasty, is a surgical method for treating eye diseases. It removes the diseased corneal stroma and connects it to a normal corneal graft to restore vision and eye structure. In corneal surgery, it involves pumping air into the corneal stroma. This process is usually called gas injection, which requires the use of a connecting needle 2 for gas injection. The existing connecting needle 2 has different values ​​of the bevel according to the model. The bevel length threshold is about 2.32mm-2.59mm, but it is not suitable for the need for gas injection during corneal transplantation. In this application, the bevel length of the first bevel body 25 and the third bevel body 27 is shortened to less than half of the existing length. When the bevel on the connecting needle 2 is relatively long, the puncture process is longer. The present application shortens the bevel length to reduce the risk of accidental injury to surrounding tissues, ensure that the gas injection process is safer and more reliable, and reduce the risk of penetrating the cornea.

[0035] In the second step, the ports of the first bevel body 25 and the third bevel body 27 are sharp tips, and their diameters are small and the bevels are short, so that they can peel the lamellar stroma more conveniently and flexibly, and are not easy to penetrate the full layer of corneal tissue;

[0036] In the third step, during corneal surgery, the first needle 21 or the third needle 23 can be used to cut a small opening in the anterior limiting layer in front of the posterior elastic layer, and then the anterior limiting layer needs to be peeled off. The existing tools are not suitable for peeling off the anterior limiting layer. Using tools such as hooks may damage the posterior elastic layer, and tools such as scissors are large and it is difficult to penetrate the end into the posterior corneal stroma window where the posterior elastic layer has been exposed. The present application provides a second needle 22 and a fourth needle 24. The ends of the second needle 22 and the fourth needle 24 are both rounded and blunt, and their diameters are small, so that the ends can be easily penetrated into the small opening of the anterior limiting layer. The rounded and blunt ports will not damage the posterior elastic layer, and the safety is better. The needle tube 1 can be directly connected through the needle to inject viscoelastic agents such as sodium hyaluronate to separate the posterior corneal stroma from the posterior elastic layer, creating a surgical space for shearing off the posterior corneal stroma.

[0037] In the fourth step, in the present application, the first bevel 25, the second bevel 26, the third bevel 27, and the fourth bevel 28 are oriented in opposite directions. The user can select a suitable connecting needle 2 for surgical use according to the needs of the operation and the habit of using the tool, thereby improving the flexibility of the user in selecting and using the tool. The connecting needle 2 of the present application can be connected to the existing needle tube 1 to suck the filtered air, push the filtered air into the corneal stroma, connect the viscoelastic agent, and use the needle tube 1 to push the viscoelastic agent into the gap in front of the posterior elastic layer, so as to maintain the space in front of the posterior elastic layer and facilitate subsequent operations. The connecting needle 2 can be connected to the existing 1ml or 2ml needle tube 1, which can be used as a holding method to operate the connecting needle 2 for operations such as stripping, picking, and separation.

[0038] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A separator for deep lamellar keratoplasty surgery, comprising a needle tube (1), characterized in that: The needle tube (1) is provided with a connecting needle (2); The connecting needle (2) comprises a first needle (21), a second needle (22), a third needle (23) and a fourth needle (24); the first needle (21) is provided with a first beveled body (25), the second needle (22) is provided with a second beveled body (26), the third needle (23) is provided with a third beveled body (27), and the fourth needle (24) is provided with a fourth beveled body (28).

2. The deep lamellar keratoplasty separator according to claim 1, characterized in that: The ports of the second beveled body (26) and the fourth beveled body (28) are both round and blunt; Wherein, the ports of the first beveled body (25) and the third beveled body (27) are both sharp pointed ends.

3. The deep lamellar keratoplasty separator according to claim 2, characterized in that: The first beveled body (25), the second beveled body (26), the third beveled body (27), and the fourth beveled body (28) are oriented in opposite directions; The bevel angle thresholds of the first beveled body (25), the second beveled body (26), the third beveled body (27) and the fourth beveled body (28) are all 30°-45°.

4. The deep lamellar keratoplasty separator according to claim 3, characterized in that: The bending angle thresholds of the first needle (21), the second needle (22), the third needle (23) and the fourth needle (24) are between 120° and 150°.

5. The separator for deep lamellar keratoplasty as claimed in claim 4, characterized in that: The diameter threshold of the outer side walls of the first needle (21), the second needle (22), the third needle (23) and the fourth needle (24) is 0.3 mm to 0.5 mm.

6. The separator for deep lamellar keratoplasty as claimed in claim 5, characterized in that: The length threshold of the bent parts of the first needle (21), the second needle (22), the third needle (23) and the fourth needle (24) is 1 mm to 3 mm.

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