corneal foreign body removal device

Abstract

This utility model provides a corneal foreign body removal device, relating to the field of ophthalmic medical devices. It includes a handle, a working part, a connecting part, and a neck. The working part is fitted onto the middle of the outer wall of the handle, and the connecting part is located at one end of the handle. The neck is detachably connected to the handle via the connecting part. The device also includes a head, the tip of which is tilted at a certain angle to one side, forming a crescent-shaped curved surface. This crescent-shaped curved surface extends laterally along the inclined side to form a single-sided cutting edge. Through the cooperation of these structures, compared with existing technologies, it has the following advantages: First, the bidirectional inclined cutting edge structure significantly reduces the risk of corneal stroma tearing. The blunted rounded corners increase the contact area during device retraction, effectively avoiding secondary trauma caused by micro-movements of the eyeball and reducing the risk of corneal perforation. Second, different sizes of cutting edges can be replaced through the connecting part to adapt to differences in foreign body size, reducing the probability of misoperation due to repeated device adjustments.

Description

Technical Field

[0001] This utility model relates to the field of ophthalmic medical devices, and in particular to a corneal foreign body removal device. Background Technology

[0002] In ophthalmology clinics, corneal foreign bodies are one of the most common eye injuries, especially metal debris. Surgical removal of corneal foreign bodies is required to prevent further eye damage and complications.

[0003] Currently, corneal foreign bodies are typically removed clinically using corneal foreign body needles or syringe needles. This requires an ophthalmologist to remove the foreign body under the assistance of a microscope. When removing the foreign body, the ophthalmologist will first instill topical anesthetic into the patient's eye until the anesthetic effect meets the requirements of the surgery. Then, a 1ml syringe needle (e.g., 0.45x16RWLB) is used to remove the foreign body. The needle is mainly used to completely peel off the foreign body. However, in many cases, the foreign body is difficult to completely peel off, especially metallic foreign bodies, which presents many inconveniences in practical applications.

[0004] When dealing with metal debris, such as iron filings, it is easy for them to form an oxide rust layer after embedding in the cornea. The rust layer formed by oxidation has a multi-layered structure. After removing the surface rust, existing tools often leave behind small metal fragments. In some cases, the remaining metal fragments can even form a metallic pigment ring on the corneal tissue, resulting in deep rust rings. This usually requires repeated peeling with a needle tip. However, if the small metal fragments are forcibly removed with a needle, it is very easy to generate unidirectional shear force that can cause the corneal stroma to tear, or even lead to corneal perforation, increasing the risk of postoperative astigmatism or scarring. Because iron filings are hard and irregularly shaped, the effect of layer-by-layer peeling using existing tools is poor, increasing the difficulty and risk of the surgery.

[0005] In addition, because the tips of corneal foreign body needles and syringe needles are too sharp and have a small effective area, the contact area between the instrument and the cornea can easily become uncontrollable due to the slight movement of the patient's eyeball during the operation, which can easily lead to serious complications such as corneal perforation, aqueous humor outflow and intraocular infection. At the same time, the needle tip does not have a blunting protection structure, and the end of the blade can easily scratch the corneal surface when the instrument is withdrawn. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a corneal foreign body removal device that can ensure the complete removal of foreign bodies while avoiding damage to layered tissues and shortening the operation time.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: This utility model provides a corneal foreign body removal device, including a handle, a working part, a connecting part and a neck. The working part is sleeved on the middle of the outer wall of the handle, the connecting part is located at one end of the handle, and the neck is detachably connected to the handle through the connecting part. It also includes a head, the tip of the head is tilted at a certain angle to one side to form a crescent-shaped curved surface, and the crescent-shaped curved surface extends laterally along the inclined side to form a single-sided blade.

[0008] In a preferred embodiment, the working part is made of medical-grade silicone, and the medical-grade silicone has a floral pattern. The connecting part includes a fixed head and a limiting block arranged symmetrically at the top and bottom, and the limiting block is a cylindrical block; The end of the handle is provided with a mounting groove that matches the diameter of the limiting block; The outer wall of the fixing head is provided with multiple convex textures, which are arranged at equal intervals along the circumference of the fixing head; The outer wall of the limiting block is provided with a locking structure, and the limiting block is fixed to the inner wall of the mounting groove through the locking structure.

[0009] In a preferred embodiment, the locking structure is a screw-in protrusion with a spiral structure, and the inner wall of the mounting groove is also provided with a limiting groove that engages with the screw-in protrusion. Let the diameter of the fixing head be A, the diameter of the handle be B, and the diameters of the fixing head and the handle be equal. Let the diameter of the limiting block be C. Then A = B > C.

[0010] In a preferred embodiment, the diameter of the fixing head and the handle ranges from 6mm to 8mm, and the diameter of the limiting block ranges from 4mm to 6mm.

[0011] In a preferred embodiment, the tail end of the neck is located at the center of the connecting part. The neck is curved in two sections, including a first curved section and a second curved section. The first curved section bends to one side at a specific angle near the front end of the neck. The second curved section bends at an angle opposite to the first curved section along a first direction. The first direction is parallel to the axial direction of the handle. The neck and head are in a "Z" shape. The diameter of the neck decreases continuously and gradually from the root to the end.

[0012] In the preferred embodiment, the specific angle range is 130° to 150°; The length of the neck ranges from 28mm to 32mm, and the diameter of the neck gradually decreases from 1.8mm to 0.8mm.

[0013] In a preferred embodiment, the tilt angle ranges from 60° to 80°.

[0014] In a preferred embodiment, the single-sided cutting edge includes a cutting line, a cutting surface, a cutting edge, an upper plane of the substrate, and a lower plane of the substrate; The single-sided cutting edge adopts a single-bevel chisel-type grinding structure. The cutting edge intersects with the lower plane of the base to form the main cutting angle α. The cutting edge is formed by two intersecting curved surfaces, including a leading curved surface and a trailing curved surface. The intersection line of the cutting edge and the upper plane of the base constitutes the cutting line. The cutting edge at the end of the single-sided cutting edge is continuously closed with micro-rounded corner blunting treatment to form a blunted rounded corner with a radius of curvature R and a uniform transition.

[0015] In a preferred embodiment, the radius of curvature R of the rounded corner is in the range of 0.03 mm to 0.06 mm. The value of the principal cutting edge angle α ranges from 20° to 35°; The cutting edge is waterfall-shaped, with an asymmetrical arc at the corner of the cutting edge having a curvature radius ratio of 2:1 between the top surface and the side surface, forming a "waterfall-like" gradual transition.

[0016] In a preferred embodiment, the head has a right-angled triangle cross-section, one side of the cutting edge is blunted to form an arc, the head is made of titanium alloy, and the surface of the one side of the cutting edge is coated with a nano-silver antibacterial layer. An irregularly shaped groove is provided on the inner side of the head, and anti-slip texture is added to the inner edge of the irregularly shaped groove; The depth of the irregularly shaped placement groove is 0.9 mm to 1.1 mm, and the preferred depth of the irregularly shaped placement groove is 1 mm.

[0017] This invention provides a corneal foreign body removal device. Through the coordination of the above-mentioned structures, it has the following advantages compared to the prior art: First, the bidirectional beveled blade structure significantly reduces the risk of corneal stroma tearing. The blunted rounded corners increase the contact area when the instrument retracts, effectively avoiding secondary trauma caused by micro-movement of the eyeball. At the same time, it can also prevent the tip of the blade from piercing the cornea when the instrument is withdrawn, reducing the risk of corneal perforation. Secondly, the connecting part allows for quick replacement of different blade sizes to accommodate variations in the size of foreign objects, reducing the probability of misoperation caused by repeated adjustments to the instrument. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a three-dimensional exploded front view structural diagram of this utility model; Figure 2 This is a utility model Figure 1 Schematic diagram of the middle connecting part; Figure 3 This is a utility model Figure 1 Enlarged view of part A in the middle; Figure 4 This is a utility model Figure 2 A schematic diagram of the cross-section of the head; Figure 5 This is a utility model Figure 4 Enlarged view of part B in the middle; Figure 6 This is the overall appearance and structural diagram of this utility model.

[0019] In the figure: handle 1, working part 2, connecting part 3, fixing head 31, limiting block 32, neck 4, head 5, screw-in protrusion 6, convex texture 7, single-sided cutting edge 8, cutting line 81, cutting surface 82, cutting edge 83, upper plane of base 84, lower plane of base 85, anti-slip texture 9. Detailed Implementation

[0020] To better understand the purpose, structure, and function of this embodiment, the embodiments and features described herein can be combined with each other without conflict. This embodiment will now be described in detail with reference to the accompanying drawings and examples.

[0021] Example like Figures 1-5 As shown in the figure, this embodiment illustrates a corneal foreign body removal device, including a handle 1, a working part 2, a connecting part 3, a neck 4, and a head 5; the working part 2 is sleeved in the middle of the outer wall of the handle 1, the working part 2 is made of medical silicone, and the medical silicone has a flower-shaped pattern, which can be used to enhance grip and anti-slip properties, and the connecting part 3 is located at one end of the handle 1.

[0022] In this embodiment, as Figure 1 , 2 As shown, the connecting part 3 includes a fixing head 31 and a limiting block 32 arranged symmetrically in the upper and lower parts, and the limiting block 32 is a cylindrical block; The end of the handle 1 is provided with a mounting groove that matches the diameter of the limiting block 32. The outer wall of the fixation head 31 is provided with multiple convex textures 7. The multiple convex textures 7 are arranged at equal intervals along the circumference of the fixation head 31 in order to increase the friction, so that the doctor can replace the head 5 of other sizes by unscrewing the fixation head 31. It should be noted that the outer wall of the limiting block 32 is provided with a locking structure, and the limiting block 32 is fixed to the inner wall of the mounting groove through the locking structure.

[0023] Among them, the locking structure is a screw-in protrusion 6 with a spiral structure, and the inner wall of the mounting groove is also provided with a limiting groove that meshes with the screw-in protrusion 6. Furthermore, let the diameter of the fixing head 31 be A, the diameter of the handle portion 1 be B, and the diameters of the fixing head 31 and the handle portion 1 be equal, and the diameter of the limiting block 32 be C, then A = B > C. Specifically, the diameter of the fixing head 31 and the handle portion 1 ranges from 6 mm to 8 mm, and the diameter of the limiting block 32 ranges from 4 mm to 6 mm. During implementation, the doctor uses the fixed head 31, handle 1, limiting block 32 and neck 4 to work together to help position, hold and control the depth of the corneal foreign body removal device, ensuring the stability and safety of the cutting process.

[0024] In this embodiment, for example Figure 1 , 2 As shown in Figure 6, the neck 4 is detachably connected to the handle 1 via the connecting part 3. The tail end of the neck 4 is located at the center of the connecting part 3. The neck 4 is curved in two sections, including a first curved section and a second curved section. The first curved section bends to one side at a specific angle near the front end of the neck 4. The second curved section bends at an angle opposite to the first curved section along the first direction. The neck 4 and the head 5 are in a "Z" shape. The diameter of the neck 4 decreases continuously and gradually from the root to the end.

[0025] Among them, such as Figure 6 As shown, the first direction is parallel to the axial direction of the handle portion 1.

[0026] The specific angle range is 130° to 150°, and the specific angle is preferably 150°.

[0027] In addition, the length of the neck 4 ranges from 28mm to 32mm, and the diameter of the neck 4 gradually decreases from a maximum of 1.8mm near the connection part 3 to a minimum of 0.8mm at the end, thus improving the precision of the surgical operation through a smooth transition.

[0028] The length of the neck 4 is preferably 30 mm; In this embodiment, for example Figure 3 , 4 As shown in Figure 5, the tip of the head 5 is tilted at a certain angle to one side to form a crescent-shaped curved surface. The crescent-shaped curved surface extends laterally along the hypotenuse to form a single-sided cutting edge 8. The cross-section of the head 5 is a right-angled triangle. After the single-sided cutting edge 8 is blunted, it forms a tiny arc. The crescent-shaped head 5 and the blunted single-sided cutting edge 8 together form a flexible contact interface that can conform to the shape of the corneal surface. The angle of the scraper can be flexibly adjusted to better fit the corneal surface, which can more effectively scrape off the metallic pigment ring while reducing unnecessary scraping of the corneal tissue. The tilt angle ranges from 60° to 80°.

[0029] like Figure 4 As shown, the single-sided cutting edge 8 includes a cutting line 81, a cutting surface 82, a cutting edge 83, an upper plane of the base 84, and a lower plane of the base 85; Among them, the single-sided cutting edge 8 adopts a single-bevel chisel-type grinding structure, that is, the cross-section of the single-sided cutting edge 8 has an asymmetrical wedge shape. The cutting edge 82 intersects with the lower plane 85 of the substrate to form the main cutting angle α. The cutting edge 82 is formed by two intersecting curved surfaces, including a leading curved surface and a rear curved surface. Since the cutting edge 82 is a bevel, it can evenly distribute pressure and avoid tissue tearing caused by excessive local stress on the cornea. The intersection of the cutting edge 82 and the upper plane 84 of the substrate forms the cutting line 81. The cutting edge 83 at the end of the single-sided cutting edge 8 is continuously closed micro-rounded to form a uniformly transitioned rounded corner with a curvature radius of R. The curvature radius R of the rounded corner is between 0.03mm and 0.06mm, which can increase the contact area, achieve a streamlined transition, and reduce the risk of corneal scratches. In the preferred embodiment, the cutting edge 83 is waterfall-shaped, with an asymmetrical arc at the corner of the cutting edge 83 where the ratio of the curvature radius of the top surface to the side surface is 2:1, i.e., 2X:X=2:1. The curvature of the top surface arc is greater, forming a "waterfall-like" gradual transition. The smooth transition of the top surface arc can effectively separate foreign objects smoothly and reduce the formation of foreign object residues.

[0030] It should be noted that the value of the main cutting edge angle α is between 20° and 35°, with the preferred angle being 25°±2°.

[0031] In the preferred embodiment, the head 5 is made of titanium alloy (Ti-6Al-4V) or medical-grade stainless steel (316L), and the surface of the single-sided blade 8 is coated with a nano-silver antibacterial layer. When in contact with the cornea during surgery, the nano-silver layer can reduce bacterial colonization. Especially for patients with low immune function, inhibiting bacterial proliferation can reduce the release of inflammatory factors and effectively reduce the postoperative infection rate.

[0032] Furthermore, the head 5 is preferably made of titanium alloy. The dense titanium oxide layer (TiO2) formed on the surface of the titanium alloy is inert, which avoids triggering immune responses or tissue inflammation. At the same time, it has high strength and low density, and also has excellent corrosion resistance, making it suitable for long-term use and for precise operation by doctors. In the preferred embodiment, the length of the head 5 ranges from 1 mm to 1.2 mm, the width ranges from 0.4 mm to 0.5 mm, and the thickness ranges from 0.4 mm to 0.5 mm.

[0033] In addition, an eccentric placement groove is provided on the inner side of the head 5 to accommodate foreign objects removed from the cornea. Anti-slip texture 9 is added to the inner edge of the eccentric placement groove to enhance the friction against foreign objects and prevent them from falling into the eccentric placement groove and sliding out.

[0034] Furthermore, the depth of the irregular-shaped placement groove is 0.9 mm to 1.1 mm, and the preferred depth of the irregular-shaped placement groove is 1 mm.

[0035] In practical use, the doctor holds the corneal foreign body removal device and, in conjunction with a microscopic device, removes the metallic foreign body from the patient's cornea. The head 5 is placed against the foreign body and tilted at a certain angle to enter the corneal stroma layer of the patient's eye. The upper plane 84 and lower plane 85 of the base form a stable support structure. The doctor applies a slight external force to the corneal surface, which is transmitted through the cornea to the blade 82. Due to the principal cutting angle α on the single-sided blade 8, the blade edge 83 has good cutting ability. When the blade 82 contacts the cornea, as the doctor gradually pushes... In the corneal foreign body removal device, under pressure, the blade edge 83 first contacts the surface of the foreign body. Due to the increased contact area caused by the rounded corners, the peak pressure on the cornea is reduced, which reduces the damage to the cornea to a certain extent. As the external force continues to act, the doctor uses the tilt angle of the blade surface 82 and the cooperation of the blade edge 83. The transition surface formed by the rounded corners of the blade edge 83 forms a removal guide channel. The centrifugal force generated by the cutting motion guides the foreign body along the tangential direction of the blade edge 83 into the foreign body placement groove, thereby realizing the separation of the foreign body from the cornea. After removing the foreign body, the doctor slowly retracts the corneal foreign body removal device. The blunted rounded corners of the 83-inch blade ensure that the corneal foreign body removal device does not cause secondary damage to surrounding tissues when entering and exiting the surgical area of ​​the corneal stroma.

[0036] To enable those skilled in the art to better understand the present invention, the above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

[0037] It should also be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this utility model described herein.

Claims

1. A corneal foreign body removal device, comprising a handle (1), a working part (2), a connecting part (3), and a neck (4), wherein the working part (2) is sleeved on the middle of the outer wall of the handle (1), the connecting part (3) is disposed at one end of the handle (1), and the neck (4) is detachably connected to the handle (1) through the connecting part (3), characterized in that, It also includes a head (5), the tip of the head (5) is tilted at a certain angle along one side to form a crescent-shaped curved surface configuration, and the crescent-shaped curved surface configuration extends laterally along the hypotenuse to form a single-sided cutting edge (8).

2. The corneal foreign body removal device according to claim 1, characterized in that, The working part (2) is made of medical silicone, and the medical silicone has a flower-shaped pattern. The connecting part (3) includes a fixing head (31) and a limiting block (32) arranged symmetrically on the top and bottom. The limiting block (32) is a cylindrical block. The end of the handle (1) is provided with a mounting groove that matches the diameter of the limiting block (32); The outer wall of the fixing head (31) is provided with multiple convex textures (7), and the multiple convex textures (7) are arranged at equal intervals along the circumference of the fixing head (31); The outer wall of the limiting block (32) is provided with a locking structure, and the limiting block (32) is fixed to the inner wall of the mounting groove by the locking structure.

3. The corneal foreign body removal device according to claim 2, characterized in that, The locking structure is a screw-in protrusion (6) with a spiral structure, and the inner wall of the mounting groove is also provided with a limiting groove that engages with the screw-in protrusion (6). Let the diameter of the fixing head (31) be A, the diameter of the handle (1) be B, and the diameters of the fixing head (31) and the handle (1) be equal, and the diameter of the limiting block (32) be C, then A = B > C.

4. The corneal foreign body removal device according to claim 3, characterized in that, The diameter of the fixing head (31) and the handle (1) ranges from 6 mm to 8 mm, and the diameter of the limiting block (32) ranges from 4 mm to 6 mm.

5. The corneal foreign body removal device according to claim 1, characterized in that, The neck (4) is located at the center of the connecting part (3). The neck (4) is curved in two sections, including a first curved section and a second curved section. The first curved section bends to one side at a specific angle near the front end of the neck (4). The second curved section bends at an angle opposite to the first curved section along a first direction. The first direction is parallel to the axis of the handle part (1). The neck (4) and the head (5) are in a "Z" shape. The diameter of the neck (4) decreases continuously and gradually from the root to the end.

6. The corneal foreign body removal device according to claim 5, characterized in that, The specific angle range is 130° to 150°; The length of the neck (4) ranges from 28 mm to 32 mm, and the diameter of the neck (4) gradually decreases from 1.8 mm to 0.8 mm.

7. The corneal foreign body removal device according to claim 1, characterized in that, The tilt angle ranges from 60° to 80°.

8. The corneal foreign body removal device according to claim 7, characterized in that, The single-sided cutting edge (8) includes a cutting line (81), a cutting surface (82), a cutting edge (83), an upper plane of the base (84), and a lower plane of the base (85). The single-sided cutting edge (8) adopts a single-bevel chisel-type grinding structure. The cutting edge (82) intersects with the lower plane (85) of the base to form the main cutting angle α. The cutting edge (82) is formed by two intersecting curved surfaces, including the leading curved surface and the rear curved surface. The intersection of the cutting edge (82) and the upper plane (84) of the base constitutes the cutting line (81). The cutting edge (83) at the end of the single-sided cutting edge (8) is continuously closed micro-rounded blunting treatment to form a blunt rounded corner with a curvature radius of R and uniform transition.

9. The corneal foreign body removal device according to claim 8, characterized in that, The radius of curvature R of the blunt fillet ranges from 0.03 mm to 0.06 mm; The value of the principal cutting edge angle α ranges from 20° to 35°; The cutting edge (83) is waterfall-shaped, and the ratio of the curvature radius of the top surface to the side surface at the corner of the cutting edge (83) is 2:1, forming a "waterfall-like" gradual transition.

10. The corneal foreign body removal device according to claim 1, characterized in that, The head (5) has a right-angled triangle cross section, and the single-sided cutting edge (8) is blunted to form an arc. The head (5) is made of titanium alloy, and the surface of the single-sided cutting edge (8) is coated with a nano-silver antibacterial layer. An irregular shape groove is provided on the inner side of the head (5), and anti-slip texture (9) is added to the inner edge of the irregular shape groove. The depth of the irregularly shaped placement groove is 0.9 mm to 1.1 mm, and the preferred depth of the irregularly shaped placement groove is 1 mm.

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