Surface treatment method for ophthalmic surgical metal medical devices

Abstract

The application provides a surface treatment method of an ophthalmic surgery metal medical instrument, which comprises the following steps: (a) cutting a metal plate into a corresponding metal medical instrument rough shape by using a laser cutting machine; (b) polishing the surface of the metal medical instrument rough shape by using a 120-480 grit grinding wheel; (c) continuing to polish the surface of the product of step (b) by using a 240-320 grit nylon wheel; (d) magnetically polishing the product of step (c) to obtain a bright surface; (e) performing sand blasting treatment on the product of step (d) by using a water-containing sand blasting material; the mass content of water and sand blasting mixture in the water-containing sand blasting material is 20-40% and 60-80% respectively, and the sand blasting mixture is formed by mixing corundum and glass beads. In this way, the surface grade of the metal instrument can be ensured to be 4-5K, and the surface of the metal instrument will not be left with disinfectant and the like.

Description

Technical Field

[0001] This invention belongs to the field of metal surface treatment technology, and relates to a surface treatment method for medical devices, especially a surface treatment method for metal medical devices for ophthalmic surgery. Background Technology

[0002] Ophthalmic surgical instruments refer to medical instruments used in ophthalmic surgery, mainly including surgical scissors, forceps, tweezers, hooks, and eyelid speculum. After use, ophthalmic surgical instruments should be washed with distilled water to remove blood and bodily fluids, and then sterilized with a disinfectant. Existing metal ophthalmic surgical instruments typically only undergo grinding and polishing to give the surface a good gloss. This results in a strong reflective surface (especially noticeable when the surgeon is operating under a microscope, causing eye strain). Figure 1 As shown in the image, this significantly impacts the surgical procedure and poses safety risks. Furthermore, after repeated use, the surface luster of existing ophthalmic surgical metal instruments diminishes, and disinfectant residue easily remains on the surface. This can corrode the surgical instruments, causing considerable inconvenience to the user and ultimately affecting the precision of the surgery.

[0003] Chinese invention patent application number 202010026650.9 discloses a surface treatment method for irregularly shaped surgical tools, belonging to the field of medical device technology. The surface treatment method steps are as follows: (1) Prepare an acid solution, prepare a mixture of sulfuric acid and phosphoric acid, the weight ratio of sulfuric acid to phosphoric acid is 1:1.5-2, and put the prepared acid solution into an electrolytic cell; (2) Clean the ground irregularly shaped tool with ultrasonic cleaning; (3) Install the cleaned workpiece on a fixture, hang the fixture on the electrolytic cell rack, and completely immerse it in the acid solution of the electrolytic cell; (4) Set the workpiece and workpiece fixture as the positive electrode, set the electrode in the electrolytic cell as the negative electrode, and pass in a direct current for electrolysis; take out the fixture from the electrolytic cell, rinse the workpiece with clean water, and take the workpiece off the fixture and put it into the workpiece box; (5) Put the workpiece and its workpiece box together into a passivation tank for passivation treatment; (6) Take out the workpiece and workpiece box from the passivation tank, clean them, and dry them to complete the surface treatment of the irregularly shaped surgical tool. Such irregularly shaped surgical instruments require electrolytic and passivation treatments, which not only require the use of a variety of chemical reagents, but also make it easy for the electroplated and passivation layers on their surface to peel off, affecting the effectiveness of the surgical instruments. Summary of the Invention

[0004] To address the aforementioned deficiencies, this invention provides a surface treatment method for metal medical devices used in ophthalmic surgery.

[0005] To achieve the above-mentioned technical objectives, the present invention provides a surface treatment method for metal medical devices used in ophthalmic surgery, comprising the following steps:

[0006] (a) A laser cutting machine is used to cut metal plates into corresponding metal medical device prototypes;

[0007] (b) Polish the surface of the metal medical device prototype using a 120-480 grit grinding wheel;

[0008] (c) Continue polishing the product surface from step (b) using a 240-320 grit nylon wheel;

[0009] (d) The product from step (c) is magnetically polished to obtain a glossy surface;

[0010] It also includes the following steps:

[0011] (e) The product of step (d) is sandblasted using a water-containing sandblasting material; the water and sandblasting mixture in the water-containing sandblasting material have a mass content of 20-40% and 60-80% respectively, and the sandblasting mixture is composed of diamond and glass beads; the sandblasting pressure is 0.5-0.6 MPa and the time is 5-10 s.

[0012] Ideally, in step (e), when the material of the metal medical device is 3Cr13, the mass content of corundum and glass beads in the sandblasting mixture is 70-75% and 25-30%, respectively.

[0013] Ideally, in step (e), when the material of the metal medical device is TC4, the mass content of diamond and glass beads in the sandblasting mixture is 10-15% and 85-90%, respectively.

[0014] Ideally, in step (a), a high-precision laser cutting machine is used to cut the metal medical device according to its size, so that the size error between the prototype of the metal medical device and the actual metal medical device for ophthalmic surgery is ≤50 microns.

[0015] Ideally, the mesh count of the nylon wheel is greater than or equal to the mesh count of the grinding wheel.

[0016] Further, in step (b), a 120-250 grit grinding wheel is used to polish the metal medical device prototype; in step (c), a 260-320 grit grinding wheel is used to polish the metal medical device prototype.

[0017] Furthermore, in step (d), the diameter of the magnetic polishing turntable is 400-500 mm, the polishing time is 8-10 min, and the polishing medium is a magnetic steel needle with a diameter of 0.2-2.0 mm.

[0018] Ideally, in step (e), the diamond abrasive and the glass beads are each independently of 240 to 480 mesh.

[0019] Furthermore, in step (e), the diamond abrasive and the glass beads are independently of each other and are of 320 to 360 mesh.

[0020] Furthermore, in step (e), the mass content of water and sandblasting mixture in the water-containing sandblasting material is 30% and 70%, respectively.

[0021] The present invention relates to a surface treatment method for metal medical devices used in ophthalmic surgery. By using a water-containing sandblasting material with a specific composition and applying it under specific pressure and time, the product to be treated is sandblasted. This method ensures that the surface grade of the metal device is 4-5K and that no disinfectant residue remains on the surface, thereby extending the service life of the medical device. Attached Figure Description

[0022] Figure 1 A surface diagram (reflective) of existing metal medical devices used in ophthalmic surgery;

[0023] Figure 2 A surface view of the ophthalmic surgical metal medical device in Comparative Example 1 (after 20 days of use);

[0024] Figure 3 This is a surface view of the ophthalmic surgical metal medical device in Example 1. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to specific embodiments, but the present invention is not limited to the following embodiments. The implementation conditions used in the embodiments can be further adjusted according to different requirements of specific use, and the implementation conditions not specified are conventional conditions in this industry.

[0026] Example 1

[0027] This embodiment provides a surface treatment method for metal medical devices used in ophthalmic surgery, including the following steps:

[0028] (a) A laser cutting machine is used to cut the metal plate (3Cr13) into the corresponding metal medical device prototype; specifically: according to the size drawing of the ophthalmic surgical metal medical device, a high-precision laser cutting machine (commercially available, such as the Racon LK-QWF500, with a precision of 0.01mm) is used to cut the metal medical device prototype so that the size error between the metal medical device prototype and the ophthalmic surgical metal medical device is ≤50 microns (the size of the medical device prototype is slightly larger than the size of the finished product, in order to provide a processing allowance);

[0029] (b) Use a 120-250 grit grinding wheel to polish the surface of the metal medical device prototype to remove burrs and surface defects.

[0030] (c) Continue polishing the product surface from step (b) using a 260-320 grit nylon wheel; at this time, the grit number of the nylon wheel is greater than that of the grinding wheel, so that the surface of the product is smooth and the polishing marks from the roughing process in step (b) are removed.

[0031] (d) The product from step (c) is subjected to magnetic polishing to obtain a glossy surface; specifically as follows: the diameter of the magnetic polishing turntable is 400-500 mm, the polishing time is 8-10 min, and the polishing medium is a magnetic steel needle with a diameter of 0.2-0.5 mm;

[0032] (e) The product from step (d) is sandblasted using a water-based sandblasting mix; the water and sandblasting mixture in the water-based sandblasting mix have a mass content of 30% and 70%, respectively. The sandblasting mixture is composed of corundum and glass beads, with a mass content of 70% and 30%, respectively. The corundum and glass beads are independently 320-360 mesh (this range does not substantially affect the product quality, the same below); the sandblasting pressure is 0.5-0.6 MPa, and the time is 5-10 s (in this embodiment, the mass content of corundum and glass beads in the sandblasting mixture can be 70-75% and 25-30%, respectively, and the final product surface has little visual difference; however, using a sandblasting mixture outside the aforementioned range affects the surface quality of the product). Figure 3 As shown (it remains unchanged after 20 uses).

[0033] Example 2

[0034] This embodiment provides a surface treatment method for metal medical devices used in ophthalmic surgery, which is basically the same as that in Embodiment 1, except that the metal plate is made of TC4, and the mass content of diamond and glass beads in the sandblasting mixture is 15% and 85%, respectively (in this embodiment, the mass content of diamond and glass beads in the sandblasting mixture can be 10-15% and 85-90%, respectively, and the final product surface will not be visually different; however, using a sandblasting mixture outside the aforementioned range will affect the surface quality of the product).

[0035] Example 3

[0036] This embodiment provides a surface treatment method for metal medical devices used in ophthalmic surgery, which is basically the same as that in Embodiment 1, except that the mass content of water and sandblasting mixture in the water-containing sandblasting material is 40% and 60%, respectively.

[0037] Example 4

[0038] This embodiment provides a surface treatment method for metal medical devices used in ophthalmic surgery, which is basically the same as that in Embodiment 1, except that the mass content of water and sandblasting mixture in the water-containing sandblasting material is 20% and 80%, respectively.

[0039] Example 5

[0040] This embodiment provides a surface treatment method for metal medical devices used in ophthalmic surgery, which is basically the same as that in Embodiment 1, except that: in step (b), a 260-480 grit abrasive wheel is used to polish the surface of the metal medical device prototype; in step (c), a 240-250 grit nylon wheel is used to continue polishing.

[0041] Example 6

[0042] This embodiment provides a surface treatment method for metal medical devices used in ophthalmic surgery, which is basically the same as that in Embodiment 1, except that the diamond abrasive and glass beads are independently of each other and are 240-300 mesh.

[0043] Example 7

[0044] This embodiment provides a surface treatment method for metal medical devices used in ophthalmic surgery, which is basically the same as that in Embodiment 1, except that the diamond abrasive and glass beads are independently of each other and are 380 to 480 mesh.

[0045] Example 8

[0046] This embodiment provides a surface treatment method for metal medical instruments used in ophthalmic surgery, which is basically the same as that in Embodiment 1, except that the polishing medium is a magnetic steel needle with a diameter of 1.0 to 2.0 mm.

[0047] Comparative Example 1

[0048] This example provides a surface treatment method for metal medical devices used in ophthalmic surgery, which is basically the same as that in Example 1, except that step (e) does not contain glass beads (the surface is like...). Figure 2 (As shown).

[0049] Comparative Example 2

[0050] This example provides a surface treatment method for metal medical devices used in ophthalmic surgery, which is basically the same as that in Example 1, except that step (e) does not contain corundum.

[0051] Comparative Example 3

[0052] This example provides a surface treatment method for metal medical devices used in ophthalmic surgery, which is basically the same as that in Example 1, except that the mass content of water and sandblasting mixture in the water-containing sandblasting material is 10% and 90%, respectively.

[0053] The surface roughness, tactile feel and visual appearance of the products in Examples 1-8 and Comparative Examples 1-4 were tested, and the results are shown in Table 1.

[0054] Table 1. Test table of surface properties of medical devices in Examples 1-8 and Comparative Examples 1-4.

[0055]

[0056]

[0057] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A surface treatment method for metal medical devices used in ophthalmic surgery, comprising the following steps: (a) A laser cutting machine is used to cut the metal sheet into the corresponding metal medical device prototype; (b) Polish the surface of the metal medical device prototype using a 120-480 grit grinding wheel; (c) Continue polishing the product surface from step (b) using a 240-320 grit nylon wheel; (d) Magnetic polishing is performed on the product from step (c) to obtain a glossy surface; Its characteristic is that it further includes the following steps: (e) The product of step (d) is sandblasted using a water-containing sandblasting material; the water and sandblasting mixture in the water-containing sandblasting material have a mass content of 20-40% and 60-80% respectively, and the sandblasting mixture is composed of diamond and glass beads; the sandblasting pressure is 0.5-0.6 MPa and the time is 5-10 s.

2. The surface treatment method for ophthalmic surgical metal medical devices according to claim 1, characterized in that: In step (e), when the material of the metal medical device is 3Cr13, the mass content of diamond and glass beads in the sandblasting mixture is 70-75% and 25-30%, respectively.

3. The surface treatment method for ophthalmic surgical metal medical devices according to claim 1, characterized in that: In step (e), when the material of the metal medical device is TC4, the mass content of diamond and glass beads in the sandblasting mixture is 10-15% and 85-90%, respectively.

4. The surface treatment method for ophthalmic surgical metal medical devices according to claim 1, characterized in that: In step (a), a high-precision laser cutting machine is used to cut the metal medical device according to its size, so that the size error between the metal medical device prototype and the ophthalmic surgical metal medical device is ≤50 microns.

5. The surface treatment method for ophthalmic surgical metal medical devices according to claim 1, characterized in that: The mesh count of the nylon wheel is greater than or equal to the mesh count of the grinding wheel.

6. The surface treatment method for ophthalmic surgical metal medical devices according to claim 5, characterized in that: In step (b), a 120-250 grit grinding wheel is used to polish the metal medical device prototype; in step (c), a 260-320 grit grinding wheel is used to polish the metal medical device prototype.

7. The surface treatment method for ophthalmic surgical metal medical devices according to claim 6, characterized in that: In step (d), the diameter of the magnetic polishing turntable is 400~500mm, the polishing time is 8~10min, and the polishing medium is a magnetic steel needle with a diameter of 0.2~2.0mm.

8. The surface treatment method for ophthalmic surgical metal medical devices according to claim 1, 2, or 3, characterized in that: In step (e), the diamond and the glass beads are independently of each other and are 240 to 480 mesh.

9. The surface treatment method for ophthalmic surgical metal medical devices according to claim 8, characterized in that: In step (e), the diamond abrasive and the glass beads are independently of each other and are 320-360 mesh.

10. The surface treatment method for ophthalmic surgical metal medical devices according to claim 9, characterized in that: In step (e), the mass content of water and sandblasting mixture in the water-containing sandblasting material is 30% and 70%, respectively.

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