Surgical knife and preparation method thereof

Abstract

The invention relates to the field of magnetron sputtering coatings, and particularly discloses a surgical knife and a preparation method thereof. The TiNO coating is treated by using a cold isostatic pressing process. The research shows that the cold isostatic pressing treatment is beneficial to improving the corrosion resistance of the TiNO coating on the surface of the stainless steel substrate, and the reduction amplitude of the self-corrosion current density is gradually weakened along with the increase of the treatment time. For the hardness of a coating material, along with the increase of cold isostatic pressing treatment time, the hardness of the material is firstly improved and then reduced, so that the cold isostatic pressing treatment time needs to be strictly controlled in actual use.

Description

Technical Field

[0001] The invention relates to the field of magnetron sputtering coatings, and in particular to a surgical tool and a preparation method thereof. Background Art

[0002] Surgical knives are important medical instruments that are indispensable in surgical operations. Scalpels are usually composed of two parts: a blade and a handle. They are specially made for cutting human or animal tissues. Surgical blades are usually made of pure titanium, titanium alloy, stainless steel or carbon steel. These materials are required to have excellent cutting performance and corrosion resistance to meet the cutting needs during surgery.

[0003] Chinese patent CN202111087093.2 uses magnetron sputtering technology to prepare a TiNO tool coating that meets the requirements for hydrophilic angle, hardness, hemolysis rate and tissue adhesion. However, the corrosion resistance of the surgical tool is poor, which directly affects the service life of the surgical tool. Summary of the invention

[0004] The object of the present invention is to provide a method for preparing a surgical knife. The surgical knife material prepared by the method has excellent hardness and corrosion resistance.

[0005] The technical solution of the present invention is as follows: A method for preparing a surgical knife comprises the following steps: Substrate pretreatment: Stainless steel is used as the substrate material of surgical knives, which is successively ground, polished, pickled, degreased, cleaned and dried for use. A 10-20% HF solution is used for pickling, and a 20-25% NaOH solution is used for degreasing. After that, anhydrous ethanol and deionized water are used for cleaning, and then dried under inert gas; Preparation of TiNO coating: The dried stainless steel substrate was placed in a magnetron sputtering coating machine, and the TiNO coating was prepared in a mixed atmosphere of oxygen and nitrogen with a background vacuum of 5×10 -2 Pa, sputtering temperature is 200-220℃, substrate bias is -200~-220V, target current is 25-30A, sputtering time is 45-60min, total gas flow rate is 100-120sccm, and the flow ratio of oxygen and nitrogen is 1:3-5; Cold isostatic pressing: placing the stainless steel substrate containing the TiNO coating into a cold isostatic press and performing cold isostatic pressing for 30-150 min at a pressure of 90-100 MPa; Vacuum annealing: Place the tool material after cold isostatic pressing in a vacuum annealing furnace for 3-5 hours at a temperature of 550-600°C.

[0006] Preferably, the annealing time is 3 hours.

[0007] Preferably, the annealing temperature is 600°C.

[0008] Preferably, the pressure of the cold isostatic pressing treatment is 90 MPa.

[0009] Preferably, the cold isostatic pressing treatment time is 57 minutes.

[0010] Preferably, the flow ratio of oxygen to nitrogen is 1:3.

[0011] Furthermore, the present invention also provides a surgical knife, which is prepared by the above method.

[0012] The present invention utilizes a cold isostatic pressing process to process the TiNO coating. Studies have shown that cold isostatic pressing is beneficial to improving the corrosion resistance of the TiNO coating on the surface of a stainless steel substrate, and as the processing time increases, the reduction in the self-corrosion current density gradually decreases. As for the hardness of the coating material, as the cold isostatic pressing time increases, the material hardness first increases and then decreases. Therefore, in actual use, the time of the cold isostatic pressing treatment needs to be strictly controlled. DETAILED DESCRIPTION

[0013] The technical effects of the present invention are verified below through specific examples, but the embodiments of the present invention are not limited thereto.

[0014] Example 1 Substrate pretreatment: Stainless steel is used as the substrate material, and it is successively ground, polished, pickled, degreased, cleaned and dried for use. A 10% HF solution is used for pickling, and a 20% NaOH solution is used for degreasing. After that, anhydrous ethanol and deionized water are used for cleaning, and then dried under inert gas; Preparation of TiNO coating: The dried stainless steel substrate was placed in a magnetron sputtering coating machine, and the TiNO coating was prepared in a mixed atmosphere of oxygen and nitrogen with a background vacuum of 5×10 -2 Pa, sputtering temperature was 200 °C, substrate bias was -200 V, target current was 30 A, sputtering time was 45 min, total gas flow rate was 100 sccm, and the flow ratio of oxygen to nitrogen was 1:3; Cold isostatic pressing treatment: The stainless steel substrate containing the TiNO coating is placed in a cold isostatic press and subjected to cold isostatic pressing treatment for 30 minutes at a pressure of 90 MPa; Vacuum annealing: Place the tool material after cold isostatic pressing in a vacuum annealing furnace and anneal for 3 hours at a temperature of 600°C.

[0015] Example 2 Substrate pretreatment: Stainless steel is used as the substrate material, and it is successively ground, polished, pickled, degreased, cleaned and dried for use. A 10% HF solution is used for pickling, and a 20% NaOH solution is used for degreasing. After that, anhydrous ethanol and deionized water are used for cleaning, and then dried under inert gas; Preparation of TiNO coating: The dried stainless steel substrate was placed in a magnetron sputtering coating machine, and the TiNO coating was prepared in a mixed atmosphere of oxygen and nitrogen with a background vacuum of 5×10 -2 Pa, sputtering temperature was 200 °C, substrate bias was -200 V, target current was 30 A, sputtering time was 45 min, total gas flow rate was 100 sccm, and the flow ratio of oxygen to nitrogen was 1:3; Cold isostatic pressing: The stainless steel substrate containing the TiNO coating was placed in a cold isostatic press and subjected to cold isostatic pressing for 57 min at a pressure of 90 MPa. Vacuum annealing: Place the tool material after cold isostatic pressing in a vacuum annealing furnace and anneal for 3 hours at a temperature of 600°C.

[0016] Example 3 Substrate pretreatment: Stainless steel is used as the substrate material, and it is successively ground, polished, pickled, degreased, cleaned and dried for use. A 10% HF solution is used for pickling, and a 20% NaOH solution is used for degreasing. After that, anhydrous ethanol and deionized water are used for cleaning, and then dried under inert gas; Preparation of TiNO coating: The dried stainless steel substrate was placed in a magnetron sputtering coating machine, and the TiNO coating was prepared in a mixed atmosphere of oxygen and nitrogen with a background vacuum of 5×10 -2 Pa, sputtering temperature was 200 °C, substrate bias was -200 V, target current was 30 A, sputtering time was 45 min, total gas flow rate was 100 sccm, and the flow ratio of oxygen to nitrogen was 1:3; Cold isostatic pressing: The stainless steel substrate containing the TiNO coating is placed in a cold isostatic press and subjected to cold isostatic pressing for 90 min at a pressure of 90 MPa. Vacuum annealing: Place the tool material after cold isostatic pressing in a vacuum annealing furnace and anneal for 3 hours at a temperature of 600°C.

[0017] Example 4 Substrate pretreatment: Stainless steel is used as the substrate material, and it is successively ground, polished, pickled, degreased, cleaned and dried for use. A 10% HF solution is used for pickling, and a 20% NaOH solution is used for degreasing. After that, anhydrous ethanol and deionized water are used for cleaning, and then dried under inert gas; Preparation of TiNO coating: The dried stainless steel substrate was placed in a magnetron sputtering coating machine, and the TiNO coating was prepared in a mixed atmosphere of oxygen and nitrogen with a background vacuum of 5×10 -2 Pa, sputtering temperature was 200 °C, substrate bias was -200 V, target current was 30 A, sputtering time was 45 min, total gas flow rate was 100 sccm, and the flow ratio of oxygen to nitrogen was 1:3; Cold isostatic pressing: The stainless steel substrate containing the TiNO coating is placed in a cold isostatic press and subjected to cold isostatic pressing for 120 min at a pressure of 90 MPa. Vacuum annealing: Place the tool material after cold isostatic pressing in a vacuum annealing furnace and anneal for 3 hours at a temperature of 600°C.

[0018] Example 5 Substrate pretreatment: Stainless steel is used as the substrate material, and it is successively ground, polished, pickled, degreased, cleaned and dried for use. A 10% HF solution is used for pickling, and a 20% NaOH solution is used for degreasing. After that, anhydrous ethanol and deionized water are used for cleaning, and then dried under inert gas; Preparation of TiNO coating: The dried stainless steel substrate was placed in a magnetron sputtering coating machine, and the TiNO coating was prepared in a mixed atmosphere of oxygen and nitrogen with a background vacuum of 5×10 -2 Pa, sputtering temperature was 200 °C, substrate bias was -200 V, target current was 30 A, sputtering time was 45 min, total gas flow rate was 100 sccm, and the flow ratio of oxygen to nitrogen was 1:3; Cold isostatic pressing treatment: The stainless steel substrate containing the TiNO coating is placed in a cold isostatic press and subjected to cold isostatic pressing treatment for 150 min at a pressure of 90 MPa; Vacuum annealing: Place the tool material after cold isostatic pressing in a vacuum annealing furnace and anneal for 3 hours at a temperature of 600°C.

[0019] Comparative Example 1 Substrate pretreatment: Stainless steel is used as the substrate material, and it is successively ground, polished, pickled, degreased, cleaned and dried for use. A 10% HF solution is used for pickling, and a 20% NaOH solution is used for degreasing. After that, anhydrous ethanol and deionized water are used for cleaning, and then dried under inert gas; Preparation of TiNO coating: The dried stainless steel substrate was placed in a magnetron sputtering coating machine, and the TiNO coating was prepared in a mixed atmosphere of oxygen and nitrogen with a background vacuum of 5×10 -2Pa, sputtering temperature was 200 °C, substrate bias was -200 V, target current was 30 A, sputtering time was 45 min, total gas flow rate was 100 sccm, and the flow ratio of oxygen to nitrogen was 1:3; Vacuum annealing: The stainless steel substrate containing the TiNO coating was placed in a vacuum annealing furnace and annealed for 3 h at a temperature of 600 °C.

[0020] Comparative Example 2 Substrate pretreatment: Stainless steel is used as the substrate material, and it is successively ground, polished, pickled, degreased, cleaned and dried for use. A 10% HF solution is used for pickling, and a 20% NaOH solution is used for degreasing. After that, anhydrous ethanol and deionized water are used for cleaning, and then dried under inert gas; Preparation of TiNO coating: The dried stainless steel substrate was placed in a magnetron sputtering coating machine, and the TiNO coating was prepared in a mixed atmosphere of oxygen and nitrogen with a background vacuum of 5×10 -2 Pa, sputtering temperature was 200 °C, substrate bias was -200 V, target current was 30 A, sputtering time was 45 min, total gas flow rate was 100 sccm, and the flow ratio of oxygen to nitrogen was 1:3; Cold isostatic pressing treatment: the stainless steel substrate containing the TiNO coating is placed in a cold isostatic press and subjected to cold isostatic pressing treatment for 300 min at a pressure of 90 MPa; Vacuum annealing: Place the tool material after cold isostatic pressing in a vacuum annealing furnace and anneal for 3 hours at a temperature of 600°C.

[0021] The hardness and corrosion resistance of the experimental samples in Examples 1-5 and Comparative Examples 1-2 were evaluated by the following method: Hardness test: Nano-indenter G200 nano-indenter was used to perform nano-indentation experiment on the coating material to obtain the hardness data of the coating material. The experiment used Berkovich triangular pyramid diamond indenter, and the indentation depth did not exceed 10% of the coating thickness.

[0022] Corrosion resistance: The electrochemical test of each sample was carried out in 8.5wt% NaCl medium solution using an electrochemical workstation. The non-working surface was sealed with nail polish and the exposed area of ​​the working surface was 2.5cm 2 , tested at room temperature.

[0023] The experimental results are shown in Table 1.

[0024] Table 1 Experimental data of each sample

[0025] As can be seen from Table 1, cold isostatic pressing is beneficial to improving the corrosion resistance of the TiNO coating on the surface of the stainless steel substrate. As the treatment time increases, the reduction in the self-corrosion current density will gradually weaken. As for the hardness of the coating material, as the cold isostatic pressing time increases, the material hardness first increases and then decreases. Therefore, in actual use, the cold isostatic pressing time needs to be strictly controlled. Considering the hardness and corrosion resistance of the tool coating material, Example 2 is the most preferred technical solution.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a surgical knife, characterized in that: The following steps are involved: Substrate pretreatment: Stainless steel is used as the substrate material of surgical knives, which is successively ground, polished, pickled, degreased, cleaned and dried for use. A 10-20% HF solution is used for pickling, and a 20-25% NaOH solution is used for degreasing. After that, anhydrous ethanol and deionized water are used for cleaning, and then dried under inert gas; Preparation of TiNO coating: The dried stainless steel substrate was placed in a magnetron sputtering coating machine, and the TiNO coating was prepared in a mixed atmosphere of oxygen and nitrogen with a background vacuum of 5×10 -2 Pa, sputtering temperature is 200-220℃, substrate bias is -200~-220V, target current is 25-30A, sputtering time is 45-60min, total gas flow rate is 100-120sccm, and the flow ratio of oxygen and nitrogen is 1:3-5; Cold isostatic pressing: placing the stainless steel substrate containing the TiNO coating into a cold isostatic press and performing cold isostatic pressing for 30-150 min at a pressure of 90-100 MPa; Vacuum annealing: Place the tool material after cold isostatic pressing in a vacuum annealing furnace for 3-5 hours at a temperature of 550-600°C.

2. The preparation method according to claim 1, characterized in that The annealing time is 3h.

3. The preparation method according to claim 1, characterized in that: The annealing temperature is 600°C.

4. The preparation method according to claim 1, characterized in that: The pressure of the cold isostatic pressing treatment is 90 MPa.

5. The preparation method according to claim 1, characterized in that: The cold isostatic pressing treatment time is 57 minutes.

6. The preparation method according to claim 1, characterized in that: The flow ratio of oxygen to nitrogen is 1:

3.

7. A surgical knife, characterized in that: The surgical knife is prepared by the preparation method according to any one of claims 1 to 6.

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