Laparoscopic surgical instrument and method of making

Abstract

The application discloses a laparoscope and a preparation method thereof. In order to improve the wear resistance of the surface of the laparoscope, a silicon oxide / diamond-like carbon composite coating is prepared. Research shows that a low content of diamond-like carbon has little influence on the contact angle of the composite coating, and all can meet the demand of the anti-fog of the coating, but when the content of the diamond-like carbon reaches 50%, the contact angle of the composite coating is obviously increased, and at this time, the composite coating is not suitable for being used as the laparoscope material. At the same time, with the increase of the content of the diamond-like carbon in the composite coating, the wear resistance of the composite coating is gradually improved. In consideration of the wear resistance and the anti-fog performance of the material, the carbon content is preferably controlled in a range of 7% to 29%.

Description

Technical Field

[0001] This invention relates to the field of medical devices, specifically to a laparoscopic surgical instrument and its preparation method. Background Technology

[0002] Laparoscopic surgery, performed using electronic and optical imaging equipment, represents a significant advancement over traditional open surgery. It is widely used in the surgical treatment of various common diseases in general surgery, urology, obstetrics and gynecology, and cardiothoracic surgery. It exemplifies the application of high-tech technologies such as electronics, optics, and imaging in clinical surgery, offering advantages such as minimal trauma, fewer complications, high safety, and rapid recovery.

[0003] To prevent fogging of laparoscopic lenses, Chinese patent CN202110376158.9 describes an Al2O3+SiO2 composite transparent coating, which offers advantages such as anti-fogging, transparency, and high light transmittance. However, the aforementioned composite coating lacks sufficient wear resistance, easily leading to lens scratches and affecting the accuracy and safety of the surgery. Therefore, there is a need to design a laparoscopic surgical instrument with superior wear resistance. Summary of the Invention

[0004] The purpose of this invention is to provide laparoscopic surgical instruments that have excellent wear resistance.

[0005] The technical solution of the present invention is as follows:

[0006] A method for preparing a laparoscopic surgical instrument includes the following steps:

[0007] Substrate pretreatment: Select a transparent lens as the substrate, and polish it in sequence with sandpaper of 100, 400, 800, 1200 and 2000 grit. Then, pickle it with 18-25wt% hydrochloric acid solution, degrease it with 15-18wt% sodium bicarbonate solution, remove the residual liquid on the surface with anhydrous ethanol, and dry it for later use.

[0008] Preparation of silicon oxide / diamond-like composite coating: The substrate was placed in a magnetron sputtering reaction chamber, and co-sputtered with a SiO2 target and a carbon target under an argon atmosphere. During sputtering, the background vacuum was 10. -4 Pa, argon flow rate of 80-100 sccm, working pressure of 1.2-1.5 Pa, substrate temperature of 180-200℃, target-substrate distance of 8-9 cm, by adjusting the sputtering power of the two target materials, the carbon content in the composite coating is 7-29 wt%, and by adjusting the sputtering time, the thickness of the composite coating is 5-8 μm.

[0009] Stress-relief annealing: Place the lens containing the composite coating into a vacuum annealing furnace and anneal it at 200-220℃ for 1.5-2.0 hours. Remove it after natural cooling.

[0010] Preferably, the concentration of the hydrochloric acid solution is 18 wt%.

[0011] Preferably, the argon flow rate is 100 sccm.

[0012] Preferably, the working pressure is 1.2 Pa.

[0013] Preferably, the substrate temperature is 180°C.

[0014] Preferably, the thickness of the composite coating is 5 μm.

[0015] Preferably, the annealing time is 1.5 hours.

[0016] Furthermore, the present invention also provides a laparoscopic surgical instrument, which is prepared by the above method.

[0017] To improve the wear resistance of laparoscopic surfaces, this invention prepares a silica / diamond-like carbon (DLC) composite coating. Studies show that low DLC content has little impact on the contact angle of the composite coating and still meets the anti-fogging requirements. However, when the DLC content reaches 50%, the contact angle of the composite coating increases significantly, making it unsuitable for use as a laparoscopic material. Simultaneously, as the DLC content in the composite coating increases, its wear resistance gradually improves. Considering both wear resistance and anti-fogging performance, a carbon content of 7%-29% is optimal. Detailed Implementation

[0018] The technical effects of the present invention will be verified through specific embodiments below, but the implementation of the present invention is not limited thereto.

[0019] Example 1

[0020] Substrate pretreatment: Select a transparent lens as the substrate, and polish it in sequence with sandpaper of 100, 400, 800, 1200 and 2000 grit. Then, perform acid washing with 18wt% hydrochloric acid solution, degrease treatment with 15wt% sodium bicarbonate solution, remove residual liquid on the surface with anhydrous ethanol, and dry it for later use.

[0021] Preparation of silicon oxide / diamond-like composite coating: The substrate was placed in a magnetron sputtering reaction chamber, and co-sputtered with a SiO2 target and a carbon target under an argon atmosphere. During sputtering, the background vacuum was 10. -4Pa, argon flow rate of 100 sccm, working pressure of 1.2 Pa, substrate temperature of 180℃, target-substrate distance of 8 cm, by adjusting the sputtering power of the two target materials, the carbon content in the composite coating is 7 wt%, and by adjusting the sputtering time, the thickness of the composite coating is 5 μm.

[0022] Stress-relief annealing: Place the lens containing the composite coating into a vacuum annealing furnace and anneal it at 220°C for 1.5 hours. Remove it after natural cooling.

[0023] Example 2

[0024] Substrate pretreatment: Select a transparent lens as the substrate, and polish it in sequence with sandpaper of 100, 400, 800, 1200 and 2000 grit. Then, perform acid washing with 18wt% hydrochloric acid solution, degrease treatment with 15wt% sodium bicarbonate solution, remove residual liquid on the surface with anhydrous ethanol, and dry it for later use.

[0025] Preparation of silicon oxide / diamond-like composite coating: The substrate was placed in a magnetron sputtering reaction chamber, and co-sputtered with a SiO2 target and a carbon target under an argon atmosphere. During sputtering, the background vacuum was 10. -4 Pa, argon flow rate of 100 sccm, working pressure of 1.2 Pa, substrate temperature of 180℃, target-substrate distance of 8 cm, by adjusting the sputtering power of the two target materials, the carbon content in the composite coating is 12 wt%, and by adjusting the sputtering time, the thickness of the composite coating is 5 μm.

[0026] Stress-relief annealing: Place the lens containing the composite coating into a vacuum annealing furnace and anneal it at 220°C for 1.5 hours. Remove it after natural cooling.

[0027] Example 3

[0028] Substrate pretreatment: Select a transparent lens as the substrate, and polish it in sequence with sandpaper of 100, 400, 800, 1200 and 2000 grit. Then, perform acid washing with 18wt% hydrochloric acid solution, degrease treatment with 15wt% sodium bicarbonate solution, remove residual liquid on the surface with anhydrous ethanol, and dry it for later use.

[0029] Preparation of silicon oxide / diamond-like composite coating: The substrate was placed in a magnetron sputtering reaction chamber, and co-sputtered with a SiO2 target and a carbon target under an argon atmosphere. During sputtering, the background vacuum was 10. -4 Pa, argon flow rate of 100 sccm, working pressure of 1.2 Pa, substrate temperature of 180℃, target-substrate distance of 8 cm, by adjusting the sputtering power of the two target materials, the carbon content in the composite coating is 18 wt%, and by adjusting the sputtering time, the thickness of the composite coating is 5 μm.

[0030] Stress-relief annealing: Place the lens containing the composite coating into a vacuum annealing furnace and anneal it at 220°C for 1.5 hours. Remove it after natural cooling.

[0031] Example 4

[0032] Substrate pretreatment: Select a transparent lens as the substrate, and polish it in sequence with sandpaper of 100, 400, 800, 1200 and 2000 grit. Then, perform acid washing with 18wt% hydrochloric acid solution, degrease treatment with 15wt% sodium bicarbonate solution, remove residual liquid on the surface with anhydrous ethanol, and dry it for later use.

[0033] Preparation of silicon oxide / diamond-like composite coating: The substrate was placed in a magnetron sputtering reaction chamber, and co-sputtered with a SiO2 target and a carbon target under an argon atmosphere. During sputtering, the background vacuum was 10. -4 Pa, argon flow rate of 100 sccm, working pressure of 1.2 Pa, substrate temperature of 180℃, target-substrate distance of 8 cm, by adjusting the sputtering power of the two target materials, the carbon content in the composite coating is 24 wt%, and by adjusting the sputtering time, the thickness of the composite coating is 5 μm.

[0034] Stress-relief annealing: Place the lens containing the composite coating into a vacuum annealing furnace and anneal it at 220°C for 1.5 hours. Remove it after natural cooling.

[0035] Example 5

[0036] Substrate pretreatment: Select a transparent lens as the substrate, and polish it in sequence with sandpaper of 100, 400, 800, 1200 and 2000 grit. Then, perform acid washing with 18wt% hydrochloric acid solution, degrease treatment with 15wt% sodium bicarbonate solution, remove residual liquid on the surface with anhydrous ethanol, and dry it for later use.

[0037] Preparation of silicon oxide / diamond-like composite coating: The substrate was placed in a magnetron sputtering reaction chamber, and co-sputtered with a SiO2 target and a carbon target under an argon atmosphere. During sputtering, the background vacuum was 10. -4 Pa, argon flow rate of 100 sccm, working pressure of 1.2 Pa, substrate temperature of 180℃, target-substrate distance of 8 cm, by adjusting the sputtering power of the two target materials, the carbon content in the composite coating is 29 wt%, and by adjusting the sputtering time, the thickness of the composite coating is 5 μm.

[0038] Stress-relief annealing: Place the lens containing the composite coating into a vacuum annealing furnace and anneal it at 220°C for 1.5 hours. Remove it after natural cooling.

[0039] Comparative Example 1

[0040] Substrate pretreatment: Select a transparent lens as the substrate, and polish it in sequence with sandpaper of 100, 400, 800, 1200 and 2000 grit. Then, perform acid washing with 18wt% hydrochloric acid solution, degrease treatment with 15wt% sodium bicarbonate solution, remove residual liquid on the surface with anhydrous ethanol, and dry it for later use.

[0041] Preparation of silicon oxide coating: The substrate was placed in a magnetron sputtering reaction chamber and sputtered using a SiO2 target under an argon atmosphere. During sputtering, the background vacuum was 10. -4 Pa, argon flow rate of 100 sccm, working pressure of 1.2 Pa, substrate temperature of 180℃, target-substrate distance of 8 cm, and by adjusting sputtering time, the thickness of the composite coating is 5 μm;

[0042] Stress-relief annealing: Place the lens containing the composite coating into a vacuum annealing furnace and anneal it at 220°C for 1.5 hours. Remove it after natural cooling.

[0043] Comparative Example 2

[0044] Substrate pretreatment: Select a transparent lens as the substrate, and polish it in sequence with sandpaper of 100, 400, 800, 1200 and 2000 grit. Then, perform acid washing with 18wt% hydrochloric acid solution, degrease treatment with 15wt% sodium bicarbonate solution, remove residual liquid on the surface with anhydrous ethanol, and dry it for later use.

[0045] Preparation of silicon oxide / diamond-like composite coating: The substrate was placed in a magnetron sputtering reaction chamber, and co-sputtered with a SiO2 target and a carbon target under an argon atmosphere. During sputtering, the background vacuum was 10. -4 Pa, argon flow rate of 100 sccm, working pressure of 1.2 Pa, substrate temperature of 180℃, target-substrate distance of 8 cm, by adjusting the sputtering power of the two target materials, the carbon content in the composite coating is made to be 50 wt%, and by adjusting the sputtering time, the thickness of the composite coating is made to be 5 μm.

[0046] Stress-relief annealing: Place the lens containing the composite coating into a vacuum annealing furnace and anneal it at 220°C for 1.5 hours. Remove it after natural cooling.

[0047] Next, we evaluated the contact angle and abrasion resistance of the samples in Examples 1-5 and Comparative Examples 1-2. The test results are shown in Table 1. In Table 1, the abrasion resistance of the coating is characterized by the amount of wear in the abrasion test. The greater the amount of wear, the worse the abrasion resistance.

[0048] Table 1. Contact angle and abrasion resistance of each sample

[0049] serial number Contact angle / ° Wear amount / mg Example 1 15 9.1 Example 2 9 7.4 Example 3 4 5.0 Example 4 8 4.2 Example 5 13 3.9 Comparative Example 1 11 16.2 Comparative Example 2 29 2.2

[0050] As shown in Table 1, low diamond-like carbon (DLC) content has little impact on the contact angle of the composite coating, and all samples still meet the anti-fogging requirements. However, when the DLC content reaches 50% (Comparative Example 2), the contact angle of the composite coating increases significantly, making it unsuitable for use as a laparoscopic material. Simultaneously, as the DLC content in the composite coating increases, its wear resistance gradually improves. Considering both wear resistance and anti-fogging performance, a carbon content of 7%-29% is recommended. Furthermore, the visible light transmittance of the samples in Examples 1-5 all exceed 85%, meeting the requirements for laparoscopic surface coatings.

[0051] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a laparoscopic surgical instrument, characterized in that, The preparation method includes the following steps: Substrate pretreatment: Select a transparent lens as the substrate, and polish it in sequence with sandpaper of 100, 400, 800, 1200 and 2000 grit. Then, pickle it with 18-25wt% hydrochloric acid solution, degrease it with 15-18wt% sodium bicarbonate solution, remove the residual liquid on the surface with anhydrous ethanol, and dry it for later use. Preparation of silicon oxide / diamond-like composite coating: The substrate was placed in a magnetron sputtering reaction chamber, and co-sputtered with a SiO2 target and a carbon target under an argon atmosphere. During sputtering, the background vacuum was 10. -4 Pa, argon flow rate of 80-100 sccm, working pressure of 1.2-1.5 Pa, substrate temperature of 180-200℃, target-substrate distance of 8-9 cm, by adjusting the sputtering power of the two target materials, the carbon content in the composite coating is 7-29 wt%, and by adjusting the sputtering time, the thickness of the composite coating is 5-8 μm. Stress-relief annealing: Place the lens containing the composite coating into a vacuum annealing furnace and anneal it at 200-220℃ for 1.5-2.0 hours. Remove it after natural cooling.

2. A preparation method as described in claim 1, characterized in that, The concentration of the hydrochloric acid solution is 18 wt%.

3. A preparation method as described in claim 1, characterized in that, The argon flow rate is 100 sccm.

4. A preparation method as described in claim 1, characterized in that, The working pressure is 1.2 Pa.

5. A preparation method as described in claim 1, characterized in that, The substrate temperature is 180°C.

6. A preparation method as described in claim 1, characterized in that, The thickness of the composite coating is 5 μm.

7. A preparation method as described in claim 1, characterized in that, The annealing time is 1.5 hours.

8. A laparoscopic surgical instrument, characterized in that, The laparoscopic surgical instruments are prepared by the method described in any one of claims 1-7.