Method for removing oxide layer on surface of medical instrument

Abstract

The invention discloses a method for removing an oxide layer on the surface of a medical instrument, and relates to the technical field of surface treatment of medical instruments. The method aims tosolve the problems of incomplete removing of an oxide layer on an instrument with a complex structure and instrument damage which can be easily caused by increased sand blasting pressure. According tothe technical scheme, the method comprises the steps of ultrasonic cleaning, blow-drying, drying, etching, cooling, etc. The vacuum chamber pressure is pumped to 0.003 Pa during etching. The medicalinstrument is put into an equipment vacuum cavity and heated, so that the temperature in the cavity is 50-300 DEG C. Argon or nitrogen is introduced. A power supply is turned on. The negative voltageof 300-2000 V is applied to the medical instrument. The bombarding time is 30-300 min. High-energy particles move to the surface of a product at high speed under the action of an electric field. The oxide layer on the surface of the medical instrument is bombarded and decomposed into radicals and the like, the surface of the product is not damaged, and the surface appearance of the product is guaranteed. After the oxide layer is removed, the oxide layer is also removed in the form of atoms or radicals without producing waste and contaminants.

Description

technical field [0001] The invention relates to the technical field of medical device surface treatment, in particular to a method for removing an oxide layer on the surface of a medical device. Background technique [0002] For orthopedic surgical instruments, an oxide layer will remain on the surface after machining, which is usually treated by electropolishing. Some instruments with simple structures can be removed, but for products with complex structures such as files and reamers, the oxide layer inside the groove is difficult to remove, or the removal is not complete, resulting in a certain residual oxide layer on the surface of the instrument. [0003] The residual oxide layer poses a greater risk to the subsequent processing and use of medical devices. If a medical device with a residual oxide layer is used directly, the oxide layer is likely to cause adverse consequences such as allergy to the patient; if the medical device needs to be further processed, such as ad...

AI Technical Summary

Problems solved by technology

If a medical device with a residual oxide layer is used directly, the oxide layer is likely to cause adverse consequences such as allergy to the patient; if the medical device needs to be further processed, such as adding a protective layer on the surface of the medical device, the residual oxide layer will affect the protective layer and the medical device. Binding force

If sandblasting is used to remove the oxide layer, the residual oxide layer can be removed for products with a frosted surface and a simple structure, but for products with a bright surface or a complex structure, the residual oxide layer cannot be removed by sandblasting. Increasing the pressure during sandblasting can achieve a certain cleaning effect, but the instrument will be damaged, so further improvement is needed

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