Surgical protective film with guiding effect and preparation process

Abstract

The invention discloses a surgical protective film with a guiding effect and a preparation process, and belongs to the technical field of medical instruments. The operation protective film with the guiding function sequentially comprises a first water retaining dam, an antibacterial film, a collecting bag, a valve and a discharging hose from top to bottom, and a second water retaining dam and a third water retaining dam are vertically arranged on the periphery of the antibacterial film side by side; the water retaining dam is obtained by soaking water retaining foam in a PE-PU solution, punching the water retaining foam through a laser-beam drilling machine and conducting hydrophobic treatment. The antibacterial film is obtained by coating and drying a polymer solution and nano particles. According to the surgical protective film, the antibacterial film with the guiding function is prepared through the laser etching technology, positioning in the surgical process is facilitated, and therefore the surgical efficiency and safety are improved; by means of the three-face blocking structure, flushing fluid flows in one direction to enter the collecting bag, the fluid can be effectively prevented from permeating to the outside of an operation area in the operation process, and the risks of pollution and cross infection in the operation process are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a surgical protective film with a guiding function and a preparation process thereof. Background Art

[0002] With the continuous advancement of medical technology, infection control and operation accuracy during surgery have become important issues in clinical medicine. Surgical protective film is an important medical device used to protect the surgical area during surgery and prevent bacteria, liquids and other contaminants from entering the surgical incision, thereby reducing the risk of surgical infection. With the continuous advancement of medical technology, the materials, structure and function of surgical protective films are also constantly improving and perfecting.

[0003] Surgical Site Infections (SSIs) are one of the common complications after surgery, which may lead to prolonged recovery time, increased medical costs, and even life-threatening. Surgical protective films reduce the invasion of microorganisms such as bacteria and viruses through physical barrier effects, thereby reducing the risk of infection. In complex surgical procedures, such as minimally invasive surgery, endoscopic surgery, or robot-assisted surgery, doctors need precise operation guidance. Surgical protective films with guiding functions can help doctors quickly locate surgical instruments through built-in marking lines, patterns, or positioning points, reduce operating errors, and improve surgical efficiency and safety. Therefore, the present invention develops a surgical protective film with a guiding function and a preparation process to solve the technical problems in the prior art that surgical protective film materials lack antibacterial properties and anti-permeability properties, and the surgical protective film is not firmly welded, and body fluids are not collected sufficiently and in a timely manner during surgery, resulting in an increased risk of infection for patients. Summary of the invention

[0004] The present invention develops a surgical protective film with a guiding function and a preparation process, which are used to solve the technical problems in the prior art that the surgical protective film material lacks antibacterial and anti-penetration properties, the surgical protective film is not firmly welded, and body fluids are not collected sufficiently and in time during surgery, resulting in an increased risk of infection for patients.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The surgical protective film with a guiding function comprises, from top to bottom, a water dam 1, an antibacterial film, a collection bag, a valve and a discharge hose, and the outer periphery of the antibacterial film is vertically arranged with a water dam 2 and a water dam 3; the water dam is obtained by water-blocking foam that is infiltrated with a PE-PU solution, punched with a laser puncher and subjected to a hydrophobic treatment; the antibacterial film is obtained by coating and drying a polymer solution and nanoparticles; The method for preparing the water retaining dam material comprises the following steps: (1) Preparation of composite materials: Weigh low-density polyethylene and polyurethane and add them into dichloromethane, stir until completely dissolved, and obtain a PE-PU solution; evenly spread the water-blocking foam in the PE-PU solution to completely soak it, then take it out and put it into an oven to dry, and obtain a composite material; (2) Punching: Use a laser punching machine to process micropores on the surface of the composite material to obtain a microporous composite material; (3) Hydrophobic treatment: Spray a hydrophobic agent on the surface of the microporous composite material to obtain a water retaining dam material.

[0006] Furthermore, in step (1), low-density polyethylene is purchased from Kunshan Yianjia Plastic Co., Ltd., polyurethane is purchased from Shanghai Kundu Industrial Co., Ltd., the mass ratio of low-density polyethylene, polyurethane and dichloromethane is 40-45:30-35:200-300, the stirring speed is 200-300rpm, the stirring time is 30-40 minutes, the water-blocking foam is purchased from Shenzhen Honglihui Packaging Materials Co., Ltd., the water-blocking foam is immersed for 15-20 minutes, the oven drying temperature is 80-85°C, and the drying is 2-3 hours; in step (2), the pore size is controlled at 50-100 microns, the pore spacing is 100 microns, the laser power is 200W, and the punching speed is 100mm / s; in step (3), the hydrophobic agent is obtained by mixing 1wt% polyimide-siloxane copolymer and 1wt% hexamethyldisiloxane in equal volumes, and the spraying speed is 5m / min.

[0007] The method for preparing the antibacterial film comprises the following steps: S1. preparing a polymer solution: weighing polylactic acid, polyurethane, polytetrafluoroethylene and polyvinyl alcohol, adding them into dichloromethane, and stirring until they are completely dissolved to obtain a polymer solution; S2, nanoparticle dispersion: adding silver ion nanoparticles into the polymer solution and treating it with an ultrasonic disperser to obtain an antibacterial film solution; S3, coating and drying: a polyethylene terephthalate film is used as a substrate, cleaned and dried, a coating machine is used to evenly coat the solution on the polyethylene terephthalate film, and then the film is placed in an oven for drying to obtain an antibacterial film.

[0008] Furthermore, the polylactic acid, polyurethane and polytetrafluoroethylene in S1 were purchased from Shanghai Kundu Industrial Co., Ltd., and polyvinyl alcohol was purchased from Zhecheng County Yiyuan Trading Co., Ltd. The mass ratio of polylactic acid, polyurethane, polytetrafluoroethylene, polyvinyl alcohol and dichloromethane is 75-80:10-12:5-6:3-4:300-350, the stirring speed is 200-300rpm, and the stirring time is 30-40 minutes; the mass volume ratio of silver ion nanoparticles to polymer solution in S2 is 0.8-1:100g / mL, the ultrasonic power is 300-350W, and the treatment time is 15-20 minutes; the coating thickness in S3 is 20-30μm, the coating speed is 8-10m / min, the coating pressure is 0.2MPa, the drying temperature is 80-90°C, and the drying time is 2-3 hours.

[0009] The preparation process of the surgical protective film with guiding function comprises the following steps: M1. Laser etching: fix the antibacterial film on the platform of the laser etcher, and use the designed pattern and scale to perform laser etching to obtain an antibacterial film with guidance; M2. Connection: Cut the water dam material to obtain water dam 1, water dam 2 and water dam 3, use ultrasonic welding to connect the three water dams to the three sides of the oriented antibacterial film respectively, then fold the two ends of water dam 1 along the dotted line, use ultrasonic welding to connect it to water dam 2 and water dam 3 respectively, and obtain a surgical protective film with three-sided blocking; then use high-frequency welding to connect the collection bag to the last side of the oriented antibacterial film to obtain a rough surgical protective film; M3. Install the valve and discharge hose: cut a small hole at the lower end of the collection bag, insert one end of the valve, and then seal it with a hot-melt sealing ring. Finally, use a hot-melt sealing ring to connect the discharge hose to the other end of the valve to obtain a surgical protective film with a guiding function.

[0010] Furthermore, in M1, the laser power is 20-50W, the laser frequency is 20-50kHz, and the etching speed is 100-300mm / s; in M2, the water dam height is 2-4cm, the ultrasonic frequency is 20-40kHz, the welding time is 3-5 seconds, the welding pressure is 0.2-0.3MPa, and the welding temperature is 70-120°C; the high frequency is 40-60kHz, the welding time is 5-8 seconds, the welding pressure is 0.3-0.4MPa, and the welding temperature is 80-150°C; the collection bag is purchased from Hangzhou Nokede Safety Technology Co., Ltd.; the discharge hose in M3 is purchased from Nangong Liyou Rubber Products Factory, and the valve is purchased from Qiqi Hardware in Yanghe New District, Suqian City.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The present invention forms a three-sided blocking structure by connecting the cut water dam material with the antibacterial film, so that the flushing liquid flows in one direction into the collecting bag, and the water dam 1 is designed with foldable areas at both ends, which can be further pasted and sealed with the water dam 2 and the water dam 3, which can effectively prevent the liquid during the operation from penetrating to the outside of the operating area, and keep the operating area dry and clean; the antibacterial film is prepared by adding silver ion nanoparticles to the polymer solution, and the silver ion has a broad-spectrum antibacterial property and can effectively inhibit the reproduction of various bacteria, fungi and viruses; by adding a valve and a discharge hose structure at the bottom of the collecting bag, the valve can conveniently control the discharge of the liquid in the collecting bag, so that the liquid generated during the operation can be discharged in time, avoiding the interference of liquid accumulation to the operation, and the discharge hose can be flexibly connected to the waste liquid collection system of the operating room, reducing the risk of contamination and cross infection during the operation.

[0012] 2. The present invention forms a composite material with flexibility, strength and chemical corrosion resistance by compounding low-density polyethylene and polyurethane; the water-blocking foam is a material with excellent water absorption and water retention, and it is immersed in a PE-PU solution to further enhance the water-blocking performance of the composite material; micropores are processed on the surface of the composite material using a laser puncher, and the pore size and pore spacing can be accurately controlled. The microporous structure is not only conducive to the penetration and guidance of liquids, but also can reduce the weight and thickness of the material while ensuring the strength of the material, and improve the air permeability and comfort of the material; spraying a hydrophobic agent on the surface of the microporous composite material can form a dense hydrophobic layer, which can significantly reduce the surface tension of the material, making it difficult for liquids to stay and penetrate on the surface of the material, preventing liquid diffusion, and thus reducing the risk of infection during surgery.

[0013] 3. The present invention uses laser etching technology to accurately convert the designed pattern and scale file into the actual structure on the antibacterial film, which is helpful for positioning during surgery, thereby improving the efficiency and safety of the surgery; the water dam is connected to the antibacterial film through ultrasonic welding, and ultrasonic welding transfers energy to the welding interface through high-frequency vibration, causing the material to melt and recombine at the microscopic level to form a high-strength connection; the collection bag is connected to the antibacterial film by using high-frequency welding, and high-frequency welding connects the collection bag to the antibacterial film through the heat generated by high-frequency electromagnetic waves to form a strong weld, ensuring the sealing between the collection bag and the antibacterial film, thereby maintaining the sterile environment inside the surgical protective film. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 The surgical protective film with guiding function of the present invention; Wherein, the reference numerals are: 1: Dam 1; 2: Dam 2; 3: Dam 3; 4: Antibacterial film; 5: Collection bag; 6: Valve; 7: Discharge hose. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Embodiment 1;

[0017] See also Figure 1 As shown, this embodiment discloses a surgical protective film with a guiding function, which includes a water retaining dam 1, an antibacterial film 4, a collecting bag 5, a valve 6 and a discharge hose 7 from top to bottom, and a water retaining dam 2 and a water retaining dam 3 are vertically arranged in parallel on the periphery of the antibacterial film.

[0018] This embodiment discloses a process for preparing a surgical protective film with a guiding function, comprising the following steps: M1. Laser etching: Fix the antibacterial film on the platform of the laser etcher, and perform laser etching using the designed pattern and scale. The laser power is 2W, the laser frequency is 20kHz, and the etching speed is 100mm / s to obtain an antibacterial film with guidance. M2. Connection: Cut the water dam material to obtain water dam 1, water dam 2 and water dam 3, the height of the water dam is 2 cm, and use ultrasonic welding to connect the three water dams to the three sides of the oriented antibacterial film respectively. Then, fold the two ends of the water dam 1 along the dotted line, and use ultrasonic welding to connect and seal it with the water dam 2 and the water dam 3 respectively to obtain a surgical protective film with three-sided blocking; then use high-frequency welding to connect the collection bag to the last side of the oriented antibacterial film to obtain a rough surgical protective film; M3. Install the valve and discharge hose: cut a small hole at the lower end of the collection bag, insert one end of the valve, and then seal it with a hot-melt sealing ring. Finally, use a hot-melt sealing ring to connect the discharge hose to the other end of the valve to obtain a surgical protective film with a guiding function.

[0019] The preparation method of the water retaining dam material comprises the following steps: (1) Preparation of composite materials: Weigh 40 g of low-density polyethylene and 30 g of polyurethane and add them to 200 g of dichloromethane, stir until completely dissolved, the stirring speed is 200 rpm, and the stirring time is 30 minutes to obtain a PE-PU solution; evenly spread the water-blocking foam in the PE-PU solution and completely soak it, the water-blocking foam soaking time is 15 minutes, then take it out and put it in an oven to dry, the oven drying temperature is 80°C, and dry it for 2 hours to obtain a composite material; (2) Punching: Use a laser punching machine to process micropores on the surface of the composite material, with the pore size controlled at 50 μm, the pore spacing at 100 μm, the laser power at 200 W, and the punching speed at 100 mm / s to obtain a microporous composite material; (3) Hydrophobic treatment: Spray a hydrophobic agent on the surface of the microporous composite material at a spraying speed of 5 m / min to obtain a water retaining dam material.

[0020] The method for preparing the antibacterial film comprises the following steps: S1. Prepare a polymer solution: weigh 75 g of polylactic acid, 10 g of polyurethane, 5 g of polytetrafluoroethylene and 3 g of polyvinyl alcohol, add them into 300 g of dichloromethane, stir until completely dissolved, at a stirring speed of 200 rpm, for 30 minutes, to obtain a polymer solution; S2, nanoparticle dispersion: 0.8 g of silver ion nanoparticles were added to 100 mL of polymer solution, and treated with an ultrasonic disperser at an ultrasonic power of 300 W for 15 minutes to obtain an antibacterial film solution; S3, coating and drying: Use polyethylene terephthalate film as the substrate, clean and dry it, use a coating machine to evenly coat the solution on the polyethylene terephthalate film, the coating thickness is 20μm, the coating speed is 8m / min, the coating pressure is 0.2MPa, and then put it into an oven to dry, the drying temperature is 80°C, and the drying time is 2-3 hours to obtain an antibacterial film. Embodiment 2;

[0021] See also Figure 1 As shown, this embodiment discloses a surgical protective film with a guiding function, which includes a water retaining dam 1, an antibacterial film 4, a collecting bag 5, a valve 6 and a discharge hose 7 from top to bottom, and a water retaining dam 2 and a water retaining dam 3 are vertically arranged in parallel on the periphery of the antibacterial film.

[0022] This embodiment discloses a process for preparing a surgical protective film with a guiding function, comprising the following steps: M1. Laser etching: Fix the antibacterial film on the platform of the laser etcher, and perform laser etching using the designed pattern and scale. The laser power is 30W, the laser frequency is 30kHz, and the etching speed is 200mm / s to obtain an antibacterial film with guidance. M2. Connection: Cut the water dam material to obtain water dam 1, water dam 2 and water dam 3, the height of the water dam is 3 cm, and use ultrasonic welding to connect the three water dams to the three sides of the oriented antibacterial film respectively, then fold the two ends of water dam 1 along the dotted line, and use ultrasonic welding to connect and seal it with water dam 2 and water dam 3 respectively, to obtain a surgical protective film with three sides blocked; then use high-frequency welding to connect the collection bag to the last side of the oriented antibacterial film to obtain a rough surgical protective film; M3. Install the valve and discharge hose: cut a small hole at the lower end of the collection bag, insert one end of the valve, and then seal it with a hot-melt sealing ring. Finally, use a hot-melt sealing ring to connect the discharge hose to the other end of the valve to obtain a surgical protective film with a guiding function.

[0023] The preparation method of the water retaining dam material comprises the following steps: (1) Preparation of composite materials: Weigh 41 g of low-density polyethylene and 31 g of polyurethane into 210 g of dichloromethane, stir until completely dissolved, the stirring speed is 210 rpm, the stirring time is 32 minutes, and a PE-PU solution is obtained; the water-blocking foam is evenly laid in the PE-PU solution and completely soaked, the water-blocking foam is soaked for 16 minutes, and then taken out and placed in an oven for drying, the oven drying temperature is 82°C, and the drying is carried out for 2 hours to obtain a composite material; (2) Punching: Use a laser punching machine to process micropores on the surface of the composite material. The pore size is controlled at 60 μm, the pore spacing is 100 μm, the laser power is 200 W, and the punching speed is 100 mm / s to obtain a microporous composite material. (3) Hydrophobic treatment: Spray a hydrophobic agent on the surface of the microporous composite material at a spraying speed of 5 m / min to obtain a water retaining dam material.

[0024] The method for preparing the antibacterial film comprises the following steps: S1. Prepare a polymer solution: weigh 76 g of polylactic acid, 10 g of polyurethane, 5 g of polytetrafluoroethylene and 3 g of polyvinyl alcohol, add them into 320 g of dichloromethane, and stir until completely dissolved at a stirring speed of 250 rpm for 32 minutes to obtain a polymer solution; S2, nanoparticle dispersion: 0.9 g of silver ion nanoparticles were added to 100 mL of polymer solution, and treated with an ultrasonic disperser at an ultrasonic power of 310 W for 16 minutes to obtain an antibacterial film solution; S3, coating and drying: Use polyethylene terephthalate film as the substrate, clean and dry it, use a coating machine to evenly coat the solution on the polyethylene terephthalate film, the coating thickness is 22 μm, the coating speed is 8.5 m / min, the coating pressure is 0.2 MPa, and then put it into an oven to dry, the drying temperature is 82°C, and the drying time is 2 hours to obtain an antibacterial film. Embodiment 3;

[0025] See also Figure 1 As shown, this embodiment discloses a surgical protective film with a guiding function, which includes a water retaining dam 1, an antibacterial film 4, a collecting bag 5, a valve 6 and a discharge hose 7 from top to bottom, and a water retaining dam 2 and a water retaining dam 3 are vertically arranged in parallel on the periphery of the antibacterial film.

[0026] This embodiment discloses a process for preparing a surgical protective film with a guiding function, comprising the following steps: M1. Laser etching: Fix the antibacterial film on the platform of the laser etcher, and perform laser etching using the designed pattern and scale. The laser power is 40W, the laser frequency is 40kHz, and the etching speed is 150mm / s to obtain an antibacterial film with guidance. M2. Connection: Cut the water dam material to obtain water dam 1, water dam 2 and water dam 3, the height of the water dam is 3 cm, and use ultrasonic welding to connect the three water dams to the three sides of the oriented antibacterial film respectively, then fold the two ends of water dam 1 along the dotted line, and use ultrasonic welding to connect and seal it with water dam 2 and water dam 3 respectively, to obtain a surgical protective film with three sides blocked; then use high-frequency welding to connect the collection bag to the last side of the oriented antibacterial film to obtain a rough surgical protective film; M3. Install the valve and discharge hose: cut a small hole at the lower end of the collection bag, insert one end of the valve, and then seal it with a hot-melt sealing ring. Finally, use a hot-melt sealing ring to connect the discharge hose to the other end of the valve to obtain a surgical protective film with a guiding function.

[0027] The preparation method of the water retaining dam material comprises the following steps: (1) Preparation of composite materials: Weigh 43 g of low-density polyethylene and 33 g of polyurethane into 240 g of dichloromethane, stir until completely dissolved, the stirring speed is 240 rpm, the stirring time is 37 minutes, and a PE-PU solution is obtained; the water-blocking foam is evenly laid in the PE-PU solution and completely soaked, the water-blocking foam is soaked for 17 minutes, and then taken out and placed in an oven for drying, the oven drying temperature is 84°C, and the drying is carried out for 3 hours to obtain a composite material; (2) Punching: Use a laser punching machine to process micropores on the surface of the composite material. The pore size is controlled at 70 μm, the pore spacing is 100 μm, the laser power is 200 W, and the punching speed is 100 mm / s to obtain a microporous composite material. (3) Hydrophobic treatment: Spray a hydrophobic agent on the surface of the microporous composite material at a spraying speed of 5 m / min to obtain a water retaining dam material.

[0028] The method for preparing the antibacterial film comprises the following steps: S1. Prepare a polymer solution: weigh 78 g of polylactic acid, 11 g of polyurethane, 6 g of polytetrafluoroethylene and 4 g of polyvinyl alcohol, add them into 340 g of dichloromethane, and stir until completely dissolved at a stirring speed of 280 rpm for 38 minutes to obtain a polymer solution; S2, nanoparticle dispersion: 1 g of silver ion nanoparticles was added to 100 mL of polymer solution, and treated with an ultrasonic disperser at an ultrasonic power of 340 W for 18 minutes to obtain an antibacterial film solution; S3, coating and drying: Use polyethylene terephthalate film as the substrate, clean and dry it, use a coating machine to evenly coat the solution on the polyethylene terephthalate film, the coating thickness is 28 μm, the coating speed is 10 m / min, the coating pressure is 0.2 MPa, and then put it into an oven to dry, the drying temperature is 88°C, and the drying time is 3 hours to obtain an antibacterial film. Embodiment 4;

[0029] See also Figure 1 As shown, this embodiment discloses a surgical protective film with a guiding function, which includes a water retaining dam 1, an antibacterial film 4, a collecting bag 5, a valve 6 and a discharge hose 7 from top to bottom, and a water retaining dam 2 and a water retaining dam 3 are vertically arranged in parallel on the periphery of the antibacterial film.

[0030] This embodiment discloses a process for preparing a surgical protective film with a guiding function, comprising the following steps: M1. Laser etching: Fix the antibacterial film on the platform of the laser etcher, and perform laser etching using the designed pattern and scale. The laser power is 50W, the laser frequency is 50kHz, and the etching speed is 300mm / s to obtain an antibacterial film with guidance. M2. Connection: Cut the water dam material to obtain water dam 1, water dam 2 and water dam 3, the height of the water dam is 4 cm, and use ultrasonic welding to connect the three water dams to the three sides of the oriented antibacterial film respectively, then fold the two ends of water dam 1 along the dotted line, and use ultrasonic welding to connect and seal it with water dam 2 and water dam 3 respectively, to obtain a surgical protective film with three-sided blocking; then use high-frequency welding to connect the collection bag to the last side of the oriented antibacterial film to obtain a rough surgical protective film; M3. Install the valve and discharge hose: cut a small hole at the lower end of the collection bag, insert one end of the valve, and then seal it with a hot-melt sealing ring. Finally, use a hot-melt sealing ring to connect the discharge hose to the other end of the valve to obtain a surgical protective film with a guiding function.

[0031] The preparation method of the water retaining dam material comprises the following steps: (1) Preparation of composite materials: Weigh 45 g of low-density polyethylene and 35 g of polyurethane and add them to 300 g of dichloromethane, stir until completely dissolved, the stirring speed is 300 rpm, and the stirring time is 40 minutes to obtain a PE-PU solution; evenly spread the water-blocking foam in the PE-PU solution and completely soak it, the water-blocking foam soaking time is 20 minutes, then take it out and put it in an oven to dry, the oven drying temperature is 85°C, and it is dried for 3 hours to obtain a composite material; (2) Punching: Use a laser punching machine to process micropores on the surface of the composite material. The pore size is controlled at 100 μm, the pore spacing is 100 μm, the laser power is 200 W, and the punching speed is 100 mm / s to obtain a microporous composite material. (3) Hydrophobic treatment: Spray a hydrophobic agent on the surface of the microporous composite material at a spraying speed of 5 m / min to obtain a water retaining dam material.

[0032] The method for preparing the antibacterial film comprises the following steps: S1. Prepare a polymer solution: weigh 80 g of polylactic acid, 12 g of polyurethane, 6 g of polytetrafluoroethylene and 4 g of polyvinyl alcohol, add them into 350 g of dichloromethane, stir until completely dissolved, stir at a speed of 300 rpm, and stir for 30-40 minutes to obtain a polymer solution; S2, nanoparticle dispersion: 1 g of silver ion nanoparticles was added to 100 mL of polymer solution, and treated with an ultrasonic disperser at an ultrasonic power of 350 W for 20 minutes to obtain an antibacterial film solution; S3, coating and drying: Use polyethylene terephthalate film as the substrate, clean and dry it, use a coating machine to evenly coat the solution on the polyethylene terephthalate film, the coating thickness is 30 μm, the coating speed is 10 m / min, the coating pressure is 0.2 MPa, and then put it into an oven to dry, the drying temperature is 90°C, and the drying time is 3 hours to obtain an antibacterial film.

[0033] Comparative Example 1: Comparative Example 1 Compared with Example 4, in the preparation process of the surgical protective film in Comparative Example 1, no silver ion nanoparticles were added, and other conditions remained unchanged.

[0034] Comparative Example 2: Compared with Example 4, in Comparative Example 2, during the preparation of the surgical protective film, no hydrophobic agent was sprayed, and other conditions remained unchanged.

[0035] Experimental example The following performance measurements were performed on the surgical protective film samples prepared in Examples 1-4 and Comparative Examples 1-2: 1. Allergy test The patch test is a method of attaching the material to be tested to the surface of the skin to observe whether it will cause an allergic reaction. According to GB / T 16886.10-2017 "Biological Evaluation of Medical Devices Part 10: Irritation and Sensitization Tests", the surgical protective film samples prepared in Examples 1-4 and Comparative Examples 1-2 are applied to the back of the subject with non-irritating tape, and lightly pressed with the palm of the hand to evenly apply it to the skin for 24 hours; 30 minutes after removal, observe the skin reaction after the indentation disappears. If the result is negative, observe again 24 hours and 48 hours after the patch test. The skin reaction evaluation criteria for the closed patch test are shown in Table 1: Table 1

[0036] 60 volunteers aged 20-50 with healthy skin were randomly selected and divided into 6 groups. The surgical protective film samples prepared by Examples 1-4 and Comparative Examples 1-2 were used respectively, and the scores of the closed patch test were recorded. The test results are shown in Table 2: Table 2

[0037] According to the test results in Table 2, the surgical protective films prepared in Examples 1-4 and Comparative Examples 1-2 of the present invention showed good safety in the human patch skin irritation experiment, were mild and non-irritating to human skin, and could be used safely.

[0038] 2. Antibacterial performance test According to GB / T 21510-2008 "Test Method for Antibacterial Performance of Nanomaterials", the antibacterial performance of the surgical protective films prepared in Examples 1-4 and Comparative Examples 1-2 was tested using the static plate method. The test results are shown in Table 3: Table 3

[0039] According to the test results in Table 3, the surgical protective films prepared in Examples 1 to 4 of the present invention have good antibacterial properties. By comparing Comparative Example 1 with Examples 1 to 4, it can be seen that adding silver ion nanoparticles can effectively improve the antibacterial properties of the surgical protective films.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0041] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A surgical protective film with a guiding function, characterized in that: From top to bottom, it comprises a water retaining dam 1 (1), an antibacterial film (4), a collection bag (5), a valve (6) and a discharge hose (7), and a water retaining dam 2 (2) and a water retaining dam 3 (3) are arranged vertically and in parallel on the periphery of the antibacterial film (4); the water retaining dam is obtained by water-blocking foam that is soaked in PE-PU solution, punched by a laser puncher and subjected to hydrophobic treatment; the antibacterial film is obtained by coating and drying a polymer solution and nanoparticles.

2. The surgical protective film with guiding function according to claim 1, characterized in that: The method for preparing the water dam material comprises the following steps: (1) Preparation of composite materials: Weigh low-density polyethylene and polyurethane and add them into dichloromethane, stir until completely dissolved, and obtain a PE-PU solution; evenly spread the water-blocking foam in the PE-PU solution to completely soak it, then take it out and put it into an oven to dry, and obtain a composite material; (2) Punching: Use a laser punching machine to process micropores on the surface of the composite material to obtain a microporous composite material; (3) Hydrophobic treatment: Spray a hydrophobic agent on the surface of the microporous composite material to obtain a water retaining dam material.

3. The surgical protective film with guiding function according to claim 2, characterized in that: In step (1), the mass ratio of low-density polyethylene, polyurethane and dichloromethane is 40-45:30-35:200-300, and the soaking time of the water-blocking foam is 15-20 minutes.

4. The surgical protective film with guiding function according to claim 2, characterized in that: In step (2), the pore size is controlled at 50-100 microns, the pore spacing is 100 microns, the laser power is 200 W, and the drilling speed is 100 mm / s; in step (3), the hydrophobic agent is obtained by mixing 1 wt% polyimide-siloxane copolymer and 1 wt% hexamethyldisiloxane in equal volumes, and the spraying speed is 5 m / min.

5. The surgical protective film with guiding function according to claim 1, characterized in that: The method for preparing the antibacterial film comprises the following steps: S1. Prepare a polymer solution: weigh polylactic acid, polyurethane, polytetrafluoroethylene and polyvinyl alcohol, add them into dichloromethane, and stir until they are completely dissolved to obtain a polymer solution; S2, nanoparticle dispersion: adding silver ion nanoparticles into the polymer solution and treating it with an ultrasonic disperser to obtain an antibacterial film solution; S3, coating and drying: a polyethylene terephthalate film is used as a substrate, cleaned and dried, a coating machine is used to evenly coat the solution on the polyethylene terephthalate film, and then the film is placed in an oven for drying to obtain an antibacterial film.

6. The surgical protective film with guiding function according to claim 5, characterized in that: The mass ratio of polylactic acid, polyurethane, polytetrafluoroethylene, polyvinyl alcohol and dichloromethane in S1 is 75-80:10-12:5-6:3-4:300-350.

7. The surgical protective film with guiding function according to claim 5, characterized in that: The mass volume ratio of silver ion nanoparticles to polymer solution in S2 is 0.8-1:100 g / mL, the ultrasonic power is 300-350 W, and the treatment time is 15-20 minutes; the coating thickness in S3 is 20-30 μm, the coating speed is 8-10 m / min, and the coating pressure is 0.2 MPa.

8. A process for preparing a surgical protective film having a guiding function, characterized in that: The steps include: M1. Laser etching: fix the antibacterial film on the platform of the laser etcher and perform laser etching to obtain an antibacterial film with guiding properties; M2. Connection: Cut the water dam material to obtain water dam one (1), water dam two (2) and water dam three (3), use ultrasonic welding to connect the three water dams to the three sides of the oriented antibacterial film respectively, then fold the two ends of water dam one along the dotted line, use ultrasonic welding to connect it to water dam two and water dam three respectively, and obtain a surgical protective film with three sides blocked; then use high-frequency welding to connect the collection bag to the last side of the oriented antibacterial film to obtain a rough surgical protective film; M3. Install the valve and discharge hose: cut a small hole at the lower end of the collection bag, insert one end of the valve, and then seal it with a hot-melt sealing ring. Finally, use a hot-melt sealing ring to connect the discharge hose to the other end of the valve to obtain a surgical protective film with a guiding function.

9. The process for preparing the surgical protective film with guiding function according to claim 8, characterized in that: The height of the water retaining dam in M2 is 2-4cm.

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