CN218279949U - Simple fixed depth cornea trephine - Google Patents

Abstract

The utility model relates to a simple and easy fixed degree of depth cornea trephine, including following part of split type design: the sword portion indicates portion of holding up and sword portion blade including sword portion, and the lower extreme that sword portion indicated portion is fixed to sword portion blade. The fixed depth part is nested and matched with the knife part, the upper end surface of the fixed depth part is contacted with the lower end of the knife part finger-supporting part during nesting, and the knife part blade protrudes out of the cornea contact surface of the fixed depth part for a preset cutting depth. When the simple fixed-depth cornea trephine is used for cutting the receptor cornea, after the cutting depth reaches the preset cutting depth, the fixed contact part cornea contact surface contacts the receptor cornea, and the cutter blade cannot continuously cut downwards, so that the uniform depth cutting of the cornea is achieved, and the operation is safer and more accurate.

Description

Simple Fixed Depth Corneal Trephine

technical field

The utility model relates to a simple and fixed-depth corneal trephine, which belongs to the technical field of medical instruments.

Background technique

Blinding corneal disease, diabetic retinopathy, and glaucoma have become the three leading blind eye diseases in the world today. Blinding keratopathy is mostly caused by infectious keratitis, corneal dystrophy, corneal degeneration, or corneal trauma. Currently, the only way to restore sight to patients with blinding corneal disease is to perform corneal transplantation. Therefore, improving the survival rate of corneal donors, perfecting corneal transplantation, and reducing intraoperative and postoperative complications are crucial to the success of corneal transplantation.

In corneal transplant surgery, cutting the patient's cornea to an appropriate depth is a very important step in corneal transplant surgery. Fig. 1 is a schematic cross-sectional view of a patient's cornea circumcised during corneal transplantation. In the corneal transplant operation, the corneal trephine 20 is used to circumcision and resect the patient's cornea 10 first, and then a normal corneal donor is transplanted to the patient's eyeball.

Figure 2 shows a side view of a currently used corneal trephine. As shown in FIG. 3 , the existing corneal trephine 20 has a relatively simple structure, including a finger portion 21 and a blade 22 , wherein the finger portion 21 is in the shape of a hollow cylinder, and the blade 22 is also approximately in the shape of a hollow cylinder. The lower end of the fingers 21 is fixed to the upper end of the blade 22 , and the central axis of the fingers 21 coincides with the central axis of the blade 22 .

When using the existing corneal trephine 20 to circumcision the patient's cornea, first place the cut edge of the corneal trephine 20 on the patient's cornea 10, then gently press the upper end of the finger-holding part 21 of the corneal trephine 20 with one hand, Use the other hand to touch the outer surface of the finger rest 21 to rotate the corneal trephine 20 , so that the corneal trephine 20 cuts the patient's cornea 10 . It can be seen from the above description that when using this corneal trephine 20, when the hollow cylindrical finger-holding portion 21 of the corneal trephine 20 is lightly pressed with fingers and rotated, it is impossible to achieve uniform pressure in all directions, so the use of corneal trephine 20 When cutting the patient’s cornea, the depth of the cut cornea for one week cannot be accurately controlled. 51 Uniformity, if the depth in one direction is too deep, it is easy for the knife edge to penetrate the patient’s cornea and damage the iris and lens, which will bring complications during the operation; if the cutting depth is too deep If it is shallow and uneven, it will increase the difficulty of subsequent operations, and the cornea cannot be cut and sutured uniformly, which will affect the prognosis of the patient.

There is currently a corneal trephine. The corneal trephine uses a negative pressure suction ring to fix it on the patient's cornea, and can control the depth of cutting the patient's cornea by the corneal trephine by manually turning the angle of the corneal trephine. However, this kind of negative pressure corneal trephine has problems such as complex operation, one-time use, and high price, which greatly increases the medical insurance payment and the financial burden of patients.

Utility model content

Aiming at the above-mentioned technical problems, the utility model provides a simple fixed-depth corneal trephine, which can accurately and uniformly cut the patient's cornea with a fixed depth when using the simple fixed-depth corneal trephine to avoid excessively deep cutting. Penetrating the patient's cornea, superficial cuts, and uneven cuts. So that the operation is more precise and safe.

To achieve the above object, the utility model takes the following technical solutions:

A simple and fixed-depth corneal trephine, including the following parts of split design:

Fixed depth part, the fixed depth part is a hollow cylinder, the knife part can be nested in it, after the nested combination, the blade exposes the predetermined cutting height of the fixed depth part, and the fixed depth part of different heights can be used according to the needs to achieve different predetermined heights .

The knife part includes a knife finger and a blade, the blade is fixed at the lower end of the knife finger, and the central axis of the finger coincides with the central axis of the knife. The blade is nested and matched with the fixed depth portion.

For the simple fixed-depth corneal trepanning drill, preferably, the diameter of the blade of the knife part is the same as the diameter of the cavity of the fixed-depth part, and the height of the fixed-depth part is smaller than the height of the cavity of the knife part. The difference is a predetermined fixed depth.

For the simple fixed-depth corneal trephine, preferably, in different embodiments, the height of the fixed-depth part is different according to the predetermined cutting depth.

Based on the simple fixed-depth corneal trephine described above, when using the corneal trephine described in the utility model for corneal transplantation, the blade of the knife part is nested into the fixed-depth part, and the upper end of the fixed-depth part is placed close to the fingers of the knife part. At the lower end, the blade of the knife portion exposes the predetermined height of the fixed depth portion. Hold the trephine fingers with one hand to hold the trephine blade down on the patient's cornea, press down and turn the trephine fingers so that the trephine The blade rotates to cut the patient's cornea circularly. Since the blade of the blade exposes a fixed depth portion with a uniform height (less than the thickness of the cornea), when the cut reaches a predetermined depth, the fixed depth portion will touch the corneal surface, and the blade cannot cut down when the blade continues to be pressed down and rotated. Therefore, it can be pressed down safely during the entire cutting process, without sudden cutting through the cornea, and the maximum depth of cutting can be precisely controlled, thus making the operation safer and more precise.

The utility model has the following advantages due to the adoption of the above technical scheme:

The utility model adds the fixed depth part to the corneal trephine, so that the corneal trephine cutter part exposes the fixed height blade, and can accurately control the maximum depth of cutting, thereby making the operation safer and more accurate.

Description of drawings

FIG. 1 is a three-dimensional schematic diagram of circumcision of a patient's cornea during conventional corneal transplantation.

Fig. 2 is a schematic cross-sectional view of a patient's cornea circumcised in conventional keratoplasty.

Fig. 3 is a side view of a currently used corneal trephine.

Fig. 4 is an exploded view of the simple fixed-depth corneal trephine provided by this embodiment of the utility model.

Fig. 5 is the simple and fixed depth corneal trephine provided by this embodiment of the utility model.

Fig. 6 is a side view of the simple fixed-depth corneal circumcision provided by this embodiment of the utility model.

The marks in the figure are as follows: 10-patient’s cornea; 20-existing corneal trephine; 21-existing corneal trephine finger; 22-existing corneal trephine blade; 30-knife portion; 31-knife 32-knife blade; 40-fixed depth; 41-corneal contact surface of fixed depth; 51-cutting depth of trephine; 52-predetermined cutting depth.

detailed description

In order to make the purpose, technical solutions and advantages of the utility model clearer, the technical solutions in the utility model are described clearly and completely below. Obviously, the described embodiments are some embodiments of the utility model, rather than all implementations example. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary persons in the art without making creative efforts belong to the scope of protection of the present utility model.

Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by those skilled in the art to which the present invention belongs. "First", "second", "third", "fourth" and similar words used in the present invention do not indicate any sequence, quantity or importance, but are only used to distinguish different components. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

As shown in Figures 4 and 5, it is an exploded view and a combined sectional view of the simple fixed-depth corneal trephine provided by the utility model, including a knife part 30 and a fixed-depth part 40, and each part is as follows:

Knife part 30 is made up of two parts of knife part fingers 31 and knife part blade 32. The knife finger support 31 is a hollow cylindrical structure with both ends open, and the lower end is connected with an annular knife blade 32 .

The fixed depth part 40 is a hollow cylindrical structure, and its upper surface is a flat surface that can contact the lower end of the knife part finger support part 31, and the lower surface cornea contact surface 41 is an arc surface sunken toward the axis, and the cavity inner diameter of the fixed depth part 40 is in line with the knife part The outer diameter of the cylinder of the blade 32 is the same, and can be nested on the cylinder of the blade 52 of the knife. Preferably, when the fixed depth portion 40 is nested on the cylinder of the knife blade 32, and the upper surface of the fixed depth portion 40 is in contact with the lower surface of the knife finger support portion 31, the height of the lower end of the knife blade 32 protruding from the fixed depth portion is fixed. Cutting depth 52. More preferably, the length of the fixed cutting depth 52 can be changed by adjusting the height of the fixed depth portion according to requirements.

As shown in Figure 6, when using the simple fixed-depth corneal trephine of the present invention to carry out corneal transplantation, after determining the cutting depth 51 that needs to cut the patient's cornea 10, select the corresponding fixed-depth portion 40. Nest the fixed depth portion 40 into the knife blade 32 , and make the upper end of the fixed depth portion 40 close to the lower end of the knife finger support portion 31 . Then the combination of the combined posterior knife part 30 and the fixed depth part 40 is placed on the patient's cornea 10 . Then hold the fixed depth portion 40 with one hand, contact the outer surface of the finger holding portion 31 with the other hand and simultaneously rotate and press the finger holding portion 31 downwards, so that the knife blade 32 cuts the patient's cornea 10 . It can be known from the above description that when the simple fixed-depth corneal trephine is used, when the cutting depth 51 reaches the predetermined depth 52 , the corneal contact surface 41 of the fixed-depth part contacts the upper surface of the patient's cornea 10 . At this time, continue to press the finger-holding portion 31 downwards. Since the fixed depth portion is in contact with the patient’s cornea 10, the knife blade cannot continue to cut downwards, so the cutting depth 51 is the same as the predetermined cutting depth 52. Simultaneously, knife portion blade 32 cuts patient's cornea 10 each direction cutting depth 51 is predetermined cutting depth 52, and cutting is uniform, has avoided cutting through cornea suddenly because cutting is too deep, damages structures in the eye such as iris, lens, thereby makes operation safer and more efficient. accurate.

It should be noted that at last: the above embodiment is only in order to illustrate the technical scheme of the present invention, and is not intended to limit it; Although the present invention has been described in detail with reference to the foregoing embodiment, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the various embodiments of the present invention. and range.

Claims (5)

1. The simple fixed-depth corneal trephine is characterized by comprising the following components in split type design:

the knife part (30) comprises a knife part finger-holding part (31) and a knife part blade (32), and the blade (32) is fixed at the lower end of the knife part finger-holding part (31);

a fixed depth portion (40) of a hollow cylindrical structure, the fixed depth portion (40) being in nested engagement with the blade portion (30).

2. The simple fixed depth corneal trephine of claim 1, wherein the blade (32) outer diameter is the same as the cavity diameter of the fixed depth portion (40).

3. The simple fixed depth corneal trephine of claim 1, wherein the corneal contact surface (41) of the fixed depth portion (40) is an arc-shaped surface that is concave toward the axial center.

4. The simple fixed-depth corneal trephine according to claim 1, wherein the fixed-depth portion (40) is nested in the blade portion blade (32), and after an upper end surface of the fixed-depth portion (40) is contacted with a lower end surface of the blade portion finger-supporting portion (31), the blade portion blade (32) protrudes beyond the fixed-depth portion corneal contact surface (41) to a predetermined cutting depth (52).

5. A simple fixed depth corneal trephine according to any one of claims 1-4, wherein when the simple fixed depth corneal trephine is used to cut a patient's cornea (10), the fixed depth portion (40) contacts the upper surface of the patient's cornea (10) when the cutting depth (51) reaches a predetermined cutting depth (52); the blade (32) cannot continue to cut downward, and therefore the final all-direction cutting depth (51) is the same as the predetermined cutting depth (52).

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