Donor cornea trephine

Abstract

The utility model relates to the technical field of medical instruments, in particular to a donor cornea trephine which comprises a carrying table, a pressure ring base and a drilling tool base. A trephine inner cavity is formed in the carrying table, an annular groove is formed in the middle of the upper surface of the carrying table, a center hole is formed in the center of the bottom face of the annular groove, first air holes and positioning air holes are evenly distributed around the center hole, and the first air holes are used for adsorbing corneas; when the cornea is adsorbed, the pressure ring base is positioned above the carrying table and is used for sealing the positioning air hole; when cornea cutting is carried out, the drilling tool base is located above the carrying table, a second through hole is formed in the middle of the drilling tool base, and a drilling tool used for cutting the cornea of a donor is arranged in the second through hole. When negative pressure is generated in the inner cavity of the trephine, the pressure ring base seals the positioning air hole, the first air hole adsorbs a donor cornea, the donor cornea is tensioned and flatly attached to the bottom face of the annular groove, and the phenomenon that the cutting diameter and the regular circle of a drilling tool are affected due to the fact that the donor cornea folds is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a donor corneal trephine. Background Art

[0002] Cataracts, glaucoma, diabetic retinopathy, and blinding corneal diseases account for a high proportion of blinding eye diseases. Only corneal transplantation can restore vision. However, due to various factors, the demand of this large patient population cannot be met, and clinical treatment faces challenges. Therefore, improving the success rate of corneal transplantation is crucial. A corneal trephine is an ophthalmic instrument commonly used in ophthalmic surgery to make a circular incision on the corneal surface. During corneal transplantation, a corneal trephine is used to cut the donor cornea and then transplant it onto the patient's diseased cornea.

[0003] In the prior art, the Chinese patent publication number is "CN219397871U", the publication date is "2023.07.25", and the name is "Pillow Seat and Corneal Ring Drill", which discloses a device for cutting the cornea, which includes a pillow seat and a drill. The pillow seat includes a pillow seat body and an adsorption component. The pillow seat body has an inner cavity, and the adsorption component is provided with a plurality of air holes for adsorbing the cornea. Although the patent sets a suitable number of air holes so that the negative pressure generated by the inner cavity can adsorb the cornea flatly, the cornea will gather toward the air holes when it is adsorbed, which can easily cause corneal wrinkles, affecting the diameter and regular circle of the cornea cut by the drill, and it is not easy to suture after transplanting the donor cornea, which may cause uneven suture and cause corneal inflammation and other diseases. Summary of the Invention

[0004] The main technical problem to be solved by the utility model is that after negative pressure is formed in the inner cavity of the corneal ring drill, the cornea tends to gather toward the pore to cause wrinkles, which affects the diameter and regular circle of the cornea cut by the drill.

[0005] The utility model provides the following technical solutions:

[0006] Provided is a donor cornea trephine, comprising a carrier, a pressure ring base, and a drill base.

[0007] The carrier is a cube, and an annular groove is provided in the middle of the upper surface of the carrier. A center hole is provided at the center of the bottom surface of the annular groove, and two or more No. 1 air holes are evenly distributed around the center hole; a guide hole is provided at each of the four end corners of the carrier; and a sealing cover is provided at the lower end of the carrier.

[0008] The pressure ring base is a rectangular parallelepiped, with a through hole provided at the center of the pressure ring base, a cylinder provided at the lower end of the through hole of the pressure ring base, an annular boss provided at the connection between the cylinder and the through hole, and a No. 1 guide column provided at each of the four end corners of the lower end face of the pressure ring base, the position of the No. 1 guide column being adapted to the position of the guide hole; when adsorbing the cornea, the pressure ring base is connected to the carrier through the No. 1 guide column, and the pressure ring base is located above the carrier.

[0009] A No. 2 through hole is provided in the middle position of the drill base, and a No. 2 guide column is provided at each of the four end corners of the lower end surface of the drill base, and the position of the No. 2 guide column is adapted to the position of the guide hole; a drill is provided in the No. 2 through hole; when performing corneal cutting, the drill base is connected to the carrier through the No. 2 guide column, and the drill base is located above the carrier.

[0010] Furthermore, the No. 1 guide column and the No. 2 guide column are both cylinders, and the two ends of the No. 1 guide column and the No. 2 guide column are both set to a hemispherical shape; the No. 1 guide column is bonded to the pressure ring base by glue; the No. 2 guide column is bonded to the drill bit base by glue.

[0011] Furthermore, the bottom of the annular groove is configured to be in an arc shape, an annular groove is provided at the lower portion of the annular groove, and two positioning air holes are symmetrically provided in the annular groove.

[0012] Furthermore, a No. 2 air hole communicating with the interior of the carrier is provided on the side of the carrier, and the carrier, the No. 1 air hole, the No. 2 air hole, the center hole, and the positioning air hole form a ring drill inner cavity.

[0013] Furthermore, the first pore is coated with gentian violet.

[0014] Furthermore, the outer cylindrical surface of the drill bit is glued and fixed to the No. 2 through hole with glue, and the lower edge of the drill bit extends out of the lower plane of the drill bit base; the drill bit can be selected in different sizes, and the optional drill bit sizes are Φ6.25mm, Φ6.5mm, Φ6.75mm, Φ7mm, Φ7.25mm, Φ7.5mm, Φ7.75mm, Φ8mm, Φ8.25mm, Φ8.5mm, Φ8.75mm, Φ9mm, and Φ9.5mm.

[0015] Furthermore, a square groove is provided at the lower end of the side surface of the carrier, and the square groove is provided opposite to the second air hole.

[0016] Furthermore, the number of the No. 1 air holes is set to four.

[0017] Furthermore, the upper surface of the drill bit base is provided with four gripping parts, and the bottom of the gripping parts is hollowed out.

[0018] Furthermore, the drill blade is arranged as an inverted trapezoidal platform from top to bottom, and the inner and outer walls of the drill blade are arranged as arc surfaces.

[0019] According to the solution of the utility model, before negative pressure is generated in the inner cavity of the trephine drill, the inner surface of the donor cornea is flatly placed upward on the bottom surface of the annular groove of the carrier and aligned with the center hole of the annular groove of the carrier, and the outer cylindrical surface of the pressure ring base is clamped in the annular groove of the carrier. After negative pressure is generated in the inner cavity of the trephine drill, the No. 1 air hole absorbs the cornea, and the positioning air hole is pressed and sealed by the pressure ring base, so that the donor cornea is stretched and flatly attached to the bottom surface of the annular groove of the carrier, thereby preventing the donor cornea from wrinkling and affecting the diameter and regular circle of the drill cut. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is an overall schematic diagram of the utility model;

[0022] Figure 2 A top view of the carrier of the present invention;

[0023] Figure 3 This is a schematic diagram of the position of the No. 2 air hole of the present invention;

[0024] Figure 4 This is a schematic diagram of the pressure ring base of the present invention;

[0025] Figure 5 This is a schematic diagram of the position of the annular boss of the present utility model;

[0026] Figure 6 A schematic diagram of a drill bit base of the present invention;

[0027] Figure 7 This is a schematic diagram of the assembly of the pressure ring base and the carrier of the present invention;

[0028] Figure 8 This is a schematic diagram of the assembly of the drill bit base and the carrier of the utility model;

[0029] In the figure: carrier 1, pressure ring base 2, drill base 3, annular groove 4, guide hole 5, sealing cover 6, through hole 7, cylinder 8, No. 1 guide column 9, No. 2 through hole 10, No. 2 guide column 11, drill 12, square groove 13, gripper 14, annular groove 15 center hole 16, No. 1 air hole 17, positioning air hole 18, No. 2 air hole 19, annular boss 20. DETAILED DESCRIPTION

[0030] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0031] like Figures 1 to 8 As shown, the donor cornea trephine of the present invention includes a carrier 1, a pressure ring base 2, and a drill base 3.

[0032] The carrier 1 is a cube, which is convenient for finger gripping; an annular groove 4 is provided in the middle part of the upper surface of the carrier 1, and the annular groove 4 contacts and cooperates with the pressure ring base 2 and the drill base 3; a center hole 16 is provided at the center position of the bottom surface of the annular groove 4. Before the corneal cutting operation, the center of the cornea is marked with a marking pen. The center hole 16 is used to align with the mark at the center of the cornea, so that the doctor can select the appropriate corneal area for cutting; two or more No. 1 air holes 17 are evenly distributed around the center hole 16, and the No. 1 air holes 17 are used to adsorb the cornea; a guide hole 5 is provided at each of the four end corners of the carrier 1, and the guide hole 5 is connected to the No. 1 guide column 9 or the No. 2 guide column 11; a sealing cover 6 is provided at the lower end of the carrier 1, and the sealing cover 6 can seal the air holes on the lower bottom surface of the annular groove 4.

[0033] The pressure ring base 2 is a rectangular parallelepiped, with a through hole 7 provided at the center of the pressure ring base 2, a cylinder 8 provided at the lower end of the through hole 7, and an annular boss 20 provided at the connection between the cylinder 8 and the through hole 7. A No. 1 guide column 9 is provided at each of the four end corners of the lower end surface of the pressure ring base 2, and the position of the No. 1 guide column 9 is adapted to the position of the guide hole 5; when adsorbing the cornea, the pressure ring base 2 is connected to the carrier 1 through the No. 1 guide column 9, and the pressure ring base 2 is located above the carrier 1.

[0034] A No. 2 through hole 10 is provided in the middle position of the drill base 3, and a No. 2 guide column 11 is provided at each of the four end corners of the lower end surface of the drill base 3. The position of the No. 2 guide column 11 is adapted to the position of the guide hole 5. A drill 12 is provided in the No. 2 through hole 10. When performing corneal cutting, the drill base 3 is connected to the carrier 1 through the No. 2 guide column 11, and the drill base 3 is located above the carrier 1.

[0035] The No. 1 guide column 9 and the No. 2 guide column 11 are both cylindrical, and the two ends of the No. 1 guide column 9 and the No. 2 guide column 11 are both set to a hemispherical shape, which is convenient for connection with the guide hole 5; the No. 1 guide column 9 is bonded to the pressure ring base 2 by glue; the No. 2 guide column 11 is bonded to the drill base 3 by glue.

[0036] The bottom of the annular groove 4 is set to be an arc shape, which is adapted to the shape of the cornea and is convenient for placing the cornea; an annular groove 15 is set at the lower part of the annular groove 4, and the annular groove 15 is symmetrically provided with two positioning air holes 18.

[0037] A second air hole 19 communicating with the interior of the carrier 1 is provided on the side of the carrier 1. The carrier 1, the first air hole 17, the second air hole 19, the center hole 16, and the positioning air hole 18 form a ring drill cavity. The outer circumferential surface of the cylinder 8 of the pressure ring base 2 is stuck in the annular groove 15 of the carrier 1. After negative pressure is generated in the ring drill cavity, the first air hole 17 absorbs the cornea, and the outer circumferential surface of the cylinder 8 seals the positioning air hole 18, so that the cornea is stretched and flatly attached to the bottom surface of the annular groove 4 of the carrier 1, preventing the donor cornea from wrinkling and ensuring the diameter and regular circle of the drill 12.

[0038] The interior of the No. 1 air hole 17 is coated with gentian violet, which marks the cornea and facilitates the subsequent suturing of the cornea.

[0039] The outer cylindrical surface of the drill bit 12 is glued and fixed to the No. 2 through hole 10 with glue, and the lower edge of the drill bit 12 extends out of the lower plane of the drill bit base 3; the drill bit 12 can be selected in different sizes, and the optional sizes of the drill bit 12 are Φ6.25mm, Φ6.5mm, Φ6.75mm, Φ7mm, Φ7.25mm, Φ7.5mm, Φ7.75mm, Φ8mm, Φ8.25mm, Φ8.5mm, Φ8.75mm, Φ9mm, and Φ9.5mm.

[0040] A square groove 13 is provided at the lower end of the side of the carrier 1. The square groove 13 is provided opposite to the second air hole 19. The trachea can pass through the square groove 13. The doctor's assistant can press the syringe at the position of the second air hole 19 to work, or can work at the position of the square groove 13.

[0041] The number of the No. 1 air holes 17 is set to four, which can relatively flatly adsorb the cornea on the bottom surface of the annular groove 4 of the carrier 1.

[0042] There are four gripping parts 14 on the upper surface of the drill bit base 3. The bottom of the gripping part 14 is hollowed out to reduce the force-bearing area of ​​the drill bit 12, making it easy to install and not easy to deform.

[0043] The blade of the drill bit 12 is arranged in an inverted trapezoidal shape from top to bottom, and the inner and outer walls of the blade of the drill bit 12 are arranged in an arc surface, so that the blade of the drill bit 12 is sharp and easier to cut.

[0044] As an embodiment of the present invention, a small number of No. 1 air holes 17 results in a small negative pressure in the inner cavity of the trephine, making it impossible to adsorb and fix the cornea on the bottom surface of the annular groove 4 of the carrier 1. A large number of No. 1 air holes 17 will cause more corneal wrinkles. Therefore, in this embodiment, the number of No. 1 air holes 17 is 4, the purpose of which is to adsorb the cornea relatively flat on the bottom surface of the annular groove 4 of the carrier 1. Before the corneal cutting operation, the center of the cornea is marked with a marking pen, and the center hole 16 is used to align with the mark on the center of the cornea to facilitate the doctor to select the appropriate corneal area for cutting. Before the corneal trephine is operated, gentian violet is applied to the inside of the No. 1 air hole 17. After the corneal cutting is completed, the gentian violet leaves a mark on the edge of the cornea to facilitate suturing during corneal transplantation.

[0045] This embodiment requires a syringe and an trachea to be used in conjunction (not shown in the figure). The syringe includes a push rod, a spring sleeved on the push rod, a piston fixed to the end of the push rod, and an air outlet; one end of the trachea is connected to the air outlet of the syringe, and the other end is connected to the No. 2 air hole 19 on the carrier 1. The syringe and the trachea are used for air intake and exhaust of the inner cavity of the trephine. The syringe push rod is slowly pushed down completely and maintained. The spring is compressed and deformed to form a reaction force. The gas in the syringe cavity is discharged to the No. 2 air hole 19 through the trachea, and the syringe forms a negative pressure. At this time, the inner cavity of the trephine is in an air intake state. The syringe push rod is completely released instantly. At this time, the syringe is in an air intake state, and the inner cavity of the trephine is exhausted to the syringe through the No. 2 air hole, and the inner cavity of the trephine generates a negative pressure.

[0046] The working process of this utility model:

[0047] Connect the air outlet of the syringe to one end of the trachea and seal it, connect the other end of the trachea to the No. 2 air hole 19 and seal it, and apply gentian violet to the No. 1 air hole 17; slowly push the syringe push rod downward completely and hold it, the spring is compressed and deformed to form a reaction force, and the gas in the syringe cavity is discharged to the No. 2 air hole 19 through the trachea, and the syringe forms a negative pressure. At this time, the inner cavity of the trephine is in the air intake state, and the inner surface of the donor cornea is flatly placed on the bottom surface of the annular groove 4 of the carrier 1, and the cornea center mark is aligned with the center hole 16; fix the carrier 1 on a plane, and the four No. 1 guide columns 9 of the pressure ring base 2 are installed in the four guide holes 5 of the carrier 1, and push it downward gently, the outer cylindrical surface of the cylinder 8 of the pressure ring base 2 is stuck in the annular groove 4 of the carrier 1, and the pressure ring base 2 seals the positioning air hole 18 of the carrier 1, so that the cornea is flatly fixed on the bottom surface of the annular groove 4 of the carrier 1;

[0048] Completely release the syringe push rod instantly. At this time, the syringe is in the air intake state. The inner cavity of the ring drill exhausts air to the syringe through the No. 2 air hole 19, and the inner cavity of the ring drill generates negative pressure. The cornea is adsorbed and fixed on the bottom surface of the annular groove 4 of the carrier 1; gently remove the pressure ring base 2; install the four No. 2 guide columns 11 of the drill base 3 into the four guide holes 5 of the carrier 1, and the outer cylindrical surface of the cylinder 8 of the drill base 3 is stuck in the annular groove 4 of the carrier 1. Press the drill base 3 downward, and cut the corresponding donor cornea diameter according to the different cutting edge diameters of the drill 12. Take out the drill 12, and the donor cornea cutting is completed.

[0049] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A donor corneal trephine, characterized in that: It comprises a carrier (1), a pressure ring base (2), and a drill base (3); The carrier (1) is a cube, and an annular groove (4) is provided in the middle of the upper surface of the carrier (1), a center hole (16) is provided at the center position of the bottom surface of the annular groove (4), and two or more number one air holes (17) are evenly distributed around the center hole (16); a guide hole (5) is provided at each of the four end corners of the carrier (1); and a sealing cover (6) is provided at the lower end of the carrier (1); The pressure ring base (2) is a rectangular parallelepiped, a through hole (7) is provided at the center of the pressure ring base (2), a cylinder (8) is provided at the lower end of the through hole (7), an annular boss (20) is provided at the connection between the cylinder (8) and the through hole (7), and a No. 1 guide column (9) is provided at each of the four end corners of the lower end face of the pressure ring base (2), and the position of the No. 1 guide column (9) is adapted to the position of the guide hole (5); when adsorbing the cornea, the pressure ring base (2) is connected to the carrier (1) via the No. 1 guide column (9), and the pressure ring base (2) is located above the carrier (1); A second through hole (10) is provided in the middle of the drill base (3); a second guide column (11) is provided at each of the four corners of the lower end surface of the drill base (3); the position of the second guide column (11) is adapted to the position of the guide hole (5); a drill (12) is provided in the second through hole (10); when performing corneal cutting, the drill base (3) is connected to the carrier (1) via the second guide column (11), and the drill base (3) is located above the carrier (1).

2. The donor corneal trephine according to claim 1, characterized in that: The first guide column (9) and the second guide column (11) are both cylindrical, and both ends of the first guide column (9) and the second guide column (11) are arranged in a hemispherical shape; the first guide column (9) and the pressure ring base (2) are bonded by glue; the second guide column (11) and the drill bit base (3) are bonded by glue.

3. The donor corneal trephine according to claim 1, characterized in that: The bottom of the annular groove (4) is arranged in an arc shape, and an annular groove (15) is arranged at the lower part of the annular groove (4). The annular groove (15) is symmetrically provided with two positioning air holes (18).

4. The donor corneal trephine according to claim 1, characterized in that: The side of the carrier (1) is provided with a second air hole (19) which is connected to the inside of the carrier. The carrier (1) forms a ring drill inner cavity with the first air hole (17), the second air hole (19), the center hole (16) and the positioning air hole (18).

5. The donor corneal trephine according to claim 1, characterized in that: The first air hole (17) is coated with gentian violet.

6. The donor corneal trephine according to claim 1, characterized in that: The outer cylindrical surface of the drill bit (12) is glued and fixed to the No. 2 through hole (10), and the lower edge of the drill bit (12) extends out of the lower plane of the drill bit base (3); the drill bit (12) can be selected in different sizes, and the optional drill bit (12) sizes are Φ6.25mm, Φ6.5mm, Φ6.75mm, Φ7mm, Φ7.25mm, Φ7.5mm, Φ7.75mm, Φ8mm, Φ8.25mm, Φ8.5mm, Φ8.75mm, Φ9mm, and Φ9.5mm.

7. The donor corneal trephine according to claim 1, characterized in that: A square groove (13) is provided at the lower end of the side surface of the carrier (1), and the square groove (13) is provided opposite to the second air hole (19).

8. The donor corneal trephine according to claim 1, characterized in that: The number of the No. 1 air holes (17) is set to four.

9. The donor corneal trephine according to claim 1, characterized in that: The upper surface of the drill bit base (3) is provided with four gripping parts (14), and the bottoms of the gripping parts (14) are hollowed out.

10. The donor corneal trephine according to claim 1, characterized in that: The blade of the drill bit (12) is arranged in an inverted trapezoidal shape from top to bottom, and the inner and outer walls of the blade of the drill bit (12) are arranged in an arc surface.

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