阅读说明：本技术 一种去除医疗器械表面氧化层的方法 (Method for removing oxide layer on surface of medical instrument ) 是由 不公告发明人 于 2020-04-24 设计创作，主要内容包括：本发明公开了一种去除医疗器械表面氧化层的方法,涉及医疗器械表面处理技术领域,旨在解决结构复杂的器械上的氧化层去除不彻底、若增大喷砂压力易导致器械出现损伤的问题。其技术方案要点是,包括超声波清洗、吹干、烘干、刻蚀、冷却等步骤,刻蚀时将真空腔体气压抽至0.003Pa,将医疗器械放入设备真空腔体中,加热,使得腔体内温度为50-300℃,通入氩气或氮气,开启电源,对医疗器械施加300-2000V的负电压,轰击时间为30-300min。高能粒子在电场作用下,高速运动到产品表面进行轰击,医疗器械表面的氧化层被轰击分解为原子团等形式从基材中剥离出来,且不损伤产品表面,保证产品表面形貌；去除氧化层后,氧化层同样以原子或原子团的形式被清除,不产生废弃物和污染物。(The invention discloses a method for removing an oxide layer on the surface of a medical instrument, relates to the technical field of surface treatment of the medical instrument, and aims to solve the problems that the oxide layer on the instrument with a complex structure is not completely removed, and the instrument is easily damaged if sand blasting pressure is increased. The technical scheme is characterized by comprising the steps of ultrasonic cleaning, blow-drying, etching, cooling and the like, wherein the air pressure of a vacuum cavity is pumped to 0.003Pa during etching, the medical instrument is placed into the vacuum cavity of the equipment and heated, the temperature in the cavity is 50-300 ℃, argon or nitrogen is introduced, a power supply is started, negative voltage of 300-2000V is applied to the medical instrument, and the bombardment time is 30-300 min. The high-energy particles move to the surface of the product at a high speed under the action of an electric field for bombardment, an oxide layer on the surface of the medical instrument is bombarded and decomposed into radicals and the like, and the radicals are stripped from the base material, so that the surface of the product is not damaged, and the surface appearance of the product is ensured; after the oxide layer is removed, the oxide layer is also removed in the form of atoms or atomic groups, and no waste or pollutants are generated.)

1. A method for removing an oxide layer on the surface of a medical instrument is characterized by comprising the following steps: comprises the following steps of (a) carrying out,

ultrasonic cleaning: cleaning the medical instrument in ultrasonic cleaning solution at 3A for 5 min;

drying: introducing nitrogen gas, wherein the pressure is 0.4Mpa, the purity is 99.9%, and drying the cleaning solution on the surface of the medical instrument;

etching: pumping the air pressure of the equipment vacuum cavity to 0.003Pa, placing the medical instrument into the equipment vacuum cavity, heating to ensure that the temperature in the cavity is 50-300 ℃, introducing argon or nitrogen, starting a power supply, applying a negative voltage of 300-2000V to the medical instrument, and allowing bombardment time to be 30-300min so as to remove an oxide layer on the surface of the medical instrument;

and (3) cooling: and cooling to 50 ℃, and taking out the product from the vacuum cavity of the equipment.

2. The method for removing the oxide layer on the surface of the medical instrument according to claim 1, wherein: the flow rate of the argon or nitrogen is 30-100 sccm.

3. The method for removing the oxide layer on the surface of the medical instrument according to claim 1, wherein: the ultrasonic cleaning liquid is absolute ethyl alcohol.

4. The method for removing the oxide layer on the surface of the medical instrument according to claim 1, wherein: after blow-drying and before etching, the method also comprises the following steps,

drying: drying the medical apparatus in an oven at 50-70 deg.C for 5-10 min.

5. The method for removing the oxide layer on the surface of the medical instrument according to claim 1, wherein: a cylinder (1) is arranged in the equipment vacuum cavity, and the diameter of the cylinder (1) is 100-1000 mm.

Technical Field

The invention relates to the technical field of surface treatment of medical instruments, in particular to a method for removing an oxide layer on the surface of a medical instrument.

Background

The surface of the orthopedic surgical instrument is left with an oxide layer after machining, and the orthopedic surgical instrument is usually processed by adopting an electropolishing mode. Some instruments with simple structures can be cleaned, but for products with complex structures such as files, reamers and the like, the oxide layer inside the groove is difficult to remove or cannot be completely removed, so that a certain residual oxide layer still exists on the surface of the instrument.

The residual oxide layer presents a significant risk to subsequent processing and use of the medical device. If the medical instrument with the residual oxide layer is directly used, the oxide layer is easy to cause adverse effects such as allergy of a patient; if the medical device needs further processing, such as adding a protective layer on the surface of the medical device, the residual oxide layer may affect the bonding force between the protective layer and the medical device. If the method for removing the oxide layer by sandblasting is adopted, the residual oxide layer can be removed for the product with a frosted surface and a simple structure, but the residual oxide layer cannot be removed for the product with a bright surface or a complex structure by sandblasting, the pressure during sandblasting is properly increased, a certain cleaning effect can be achieved, but the apparatus is damaged, so that the further improvement is needed.

Disclosure of Invention

The invention aims to provide a method for removing an oxide layer on the surface of a medical appliance, which has the effects of effectively removing the oxide layer and keeping the surface appearance and appearance of a product.

The technical purpose of the invention is realized by the following technical scheme:

a method for removing an oxide layer on the surface of a medical instrument comprises the following steps,

ultrasonic cleaning: cleaning the medical instrument in ultrasonic cleaning solution at 3A for 5 min;

drying: introducing nitrogen gas, wherein the pressure is 0.4Mpa, the purity is 99.9%, and drying the cleaning solution on the surface of the medical instrument;

etching: pumping the air pressure of the equipment vacuum cavity to 0.003Pa, placing the medical instrument into the equipment vacuum cavity, heating to ensure that the temperature in the cavity is 50-300 ℃, introducing argon or nitrogen, starting a power supply, applying a negative voltage of 300-2000V to the medical instrument, and allowing bombardment time to be 30-300min so as to remove an oxide layer on the surface of the medical instrument;

and (3) cooling: and cooling to 50 ℃, and taking out the product from the vacuum cavity of the equipment.

The invention is further configured to: the flow rate of the argon or nitrogen is 30-100 sccm.

The invention is further configured to: the ultrasonic cleaning liquid is absolute ethyl alcohol.

The invention is further configured to: after blow-drying and before etching, the method also comprises the following steps,

drying: drying the medical apparatus in an oven at 50-70 deg.C for 5-10 min.

The invention is further configured to: a cylinder is arranged in the equipment vacuum cavity, and the diameter of the cylinder is 100-1000 mm.

In conclusion, the beneficial technical effects of the invention are as follows:

plasma etching is carried out by adopting electron beams and high bias voltage, high-energy particles move to the surface of a product at a high speed under the action of an electric field, a groove of a medical instrument with a complex structure can be bombarded, an oxide layer on the surface of the medical instrument is bombarded and decomposed into radicals and the like to be stripped from a base material, the surface of the product cannot be damaged, the surface appearance of the product is ensured, and the oxide layer on the surface of the medical instrument is removed; after the oxide layer is removed, the oxide layer is also removed in the form of atoms or atomic groups, and no waste or pollutants are generated after the removal.

Drawings

FIG. 1 is a schematic view of a cylindrical structure according to an embodiment of the present invention.

In the figure, 1, cylinder.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.