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CVD diamond thick-film ophthalmology scalpel, method and device for manufacturing same

A technology of diamond thick film and production method, which is applied in ophthalmic surgery and other fields, can solve the problems of inapplicable precision and ultra-precision machining, deep surface damage layer, slow polishing speed, etc., and achieves overcoming processing difficulties, low grinding pressure, and straight edge sex enhancing effect

Active Publication Date: 2009-10-21
SHENZHEN XINYUNXIANG PRECISION CUTTING TOOLS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]First, the polishing speed is extremely slow, and it takes several days to polish a diamond film
The second is the poor quality. The surface roughness of the polished diamond film can only reach the order of Ra 0.1 μm, which is far from the mirror surface, let alone the nanometer surface.
At the same time, due to the severe impact during mechanical polishing, a deep surface damage layer will also be produced.
It is no longer suitable for precision and ultra-precision machining

Method used

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  • CVD diamond thick-film ophthalmology scalpel, method and device for manufacturing same
  • CVD diamond thick-film ophthalmology scalpel, method and device for manufacturing same
  • CVD diamond thick-film ophthalmology scalpel, method and device for manufacturing same

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Effect test

Embodiment 1

[0031] Embodiment 1: as Figure 1-3 Shown, a kind of manufacture method of CVD diamond thick film ophthalmic scalpel comprises the following steps:

[0032] Step 1: Cut the CVD diamond thick film material by laser method, and cut it into the required size;

[0033] Step 2: Shape grinding and polishing; using planetary grinding and polishing, the speed is 60 rpm, and the pressure is 1Kpa;

[0034] Step 3: Thickness grinding and polishing; grinding into thin slices, speed 3000 rpm, pressure 200Kpa; natural diamond is a typical brittle material, CVD diamond thick film is relatively more brittle, and because of its polycrystalline structure, the grinding hardness is The average hardness of diamond does not have the softest direction like natural diamond (the difference in grinding hardness between the soft and hard directions on the diamond grain is more than 100 times), so grinding is more difficult. The diamond is easily broken during the process of grinding it into a 0.2×1×6 ...

Embodiment 2

[0050] Embodiment 2: structure is as embodiment 1,

[0051] The invention uses the original planetary grinding and polishing method, thermochemical grinding method and ultra-high-precision air bearing as the main shaft of the grinding and polishing machine. The diamond thick film material is brittle, the hardness is average, there is no softest direction, and the technical difficulty of being easy to damage realizes the high-precision requirements of the ophthalmic scalpel. After the completion of the project, it will open a new era of domestic diamond scalpels, fully meet the processing accuracy and sharpness requirements of imported diamond scalpels, replace traditional metal blades, and greatly reduce the damage to the eyes caused by ophthalmic surgery.

[0052] The typical shape of diamond tip part of diamond ophthalmic scalpel is as follows figure 1 Shown: Its external dimensions are 0.2×1×6mm, the tip angle is 45°, and the blade wedge angle is 38°. The straightness of ...

Embodiment 3

[0068] A CVD diamond thick-film ophthalmic scalpel with an external dimension of 0.2×1×6mm; a tip angle of 45° and a blade wedge angle of 38°; the straightness of the blade reaches 0.1 μm, namely under a 500-5000 times microscope Perfect; blade arc radius 0.05μm; tool surface roughness less than Ra0.005μm.

[0069] Or a CVD diamond thick film ophthalmic scalpel with a tip angle of 35° and a blade wedge angle of 30°; the straightness of the blade reaches 0.1 μm; the radius of the blade arc is 0.05 μm; the surface roughness of the blade is less than Ra0.005- .

[0070] Or a CVD diamond thick film ophthalmic scalpel with a tip angle of 50° and a blade wedge angle of 40°; the straightness of the blade reaches 0.1 μm; the radius of the blade arc is 0.05 μm; the surface roughness of the blade is less than Ra 0.005 μm.

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Abstract

The invention provides a CVD diamond thick-film ophthalmology scalpel, a method and a device for manufacturing the same. A planetary grinding-polishing mode is adopted to ensure that every crystal grain on the surface of a CVD diamond thick film can be ground in the softest direction thereof. An air bearing is adopted as a main shaft of a grinding-polishing machine to eliminate vibration and impact in a grinding-polishing process. A thermochemical grinding method is adopted, namely diamond atoms can be dissolved in iron or nickel and other metal crystal lattice and then be corroded at a high temperature of above 700 DEG C. The invention has the advantages of utilizing the high-temperature diffusion principle of diamond, innovatively introducing a thermochemical diffusing-grinding mode to grind the CVD diamond thick-film ophthalmology scalpel, overcoming long-standing problems of machining the CVD diamond thick film and obtaining good grinding speed, high diamond surface quality, precise shape precision and blade quality. A knife point of the CVD diamond thick-film ophthalmology scalpel is at an angle of between 35 and 50 degrees; a blade of the scalpel is at a wedge angle of between 30 and 40 degrees; the flatness of the blade reaches 0.1 mu m, namely the blade is perfect under a 500-5,000 times microscope; the radius of a circular arc of the blade is 0.05 mu m; and the surface roughness of the scalpel is less than Ra0.005 mu m.

Description

technical field [0001] The invention relates to a CVD diamond thick-film ophthalmic scalpel, a manufacturing method and a device, and belongs to the technical field. Background technique [0002] CVD thick film diamond scalpels are mainly used in ophthalmology fields such as cataract restoration of vision. At present, the knives used in cataract surgery in my country are mainly metal blades (if the patient proposes to use a diamond scalpel, a high fee will be charged), which seriously damages the tissue, prolongs the healing period, and affects the treatment effect. The straightness of the scalpel blade made of diamond can reach 0.01 μm, that is, it is perfect under a microscope of 500-5000 times; Atoms are arranged regularly, which is far smaller than a single cell. Therefore, the blade only divides a single cell into two during the operation, without hurting the adjacent cells and tissues, and will not cause bleeding. The edges of the incision are extremely smooth and nea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F9/007
Inventor 刘晓明
Owner SHENZHEN XINYUNXIANG PRECISION CUTTING TOOLS CO LTD
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