Method and apparatus for forming an antimicrobial layer on a surface of a corneal reshaping lens using vapor deposition

Abstract

The application discloses a method for forming an antibacterial layer on the surface of a corneal molding lens by using a gas deposition method, and is characterized by comprising the following steps: using a chemical vapor deposition method to sequentially deposit polydimethylsiloxane (PDMS), silver nanoparticles and nanoscale titanium dioxide (TiO2) on the surface of the corneal molding lens; wherein the temperature of the PDMS deposition process is controlled at 150°C to 200°C, the pressure is 1 to 2 Torr, and the deposition time is 10 to 20 minutes; the temperature of the silver nanoparticle deposition process is controlled at 200°C to 250°C, the pressure is 0.5 to 1.5 Torr, and the deposition time is 15 to 30 minutes; the temperature of the TiO2 nanoparticle deposition process is controlled at 250°C to 300°C, the pressure is 0.8 to 1.5 Torr, and the deposition time is 20 to 40 minutes; the method not only improves the safety and comfort of the corneal molding lens, but also significantly enhances the antibacterial ability of the corneal molding lens, thereby protecting the eye health of the wearer and prolonging the service life of the lens.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical product preparation, specifically a method and device for forming an antibacterial layer on the surface of a corneal molding lens using a gas phase deposition method. BACKGROUND

[0002] Chemical Vapor Deposition (CVD) is a widely used technology in materials science and surface engineering, used to manufacture high-purity, high-performance solid materials on solid surfaces. This method deposits materials on the surface of a pretreated substrate through a chemical process, widely used in the semiconductor industry, nanotechnology, photovoltaic technology, and the preparation of various surface coatings.

[0003] Corneal molding lenses are widely used for vision correction. Since the corneal molding lens directly contacts the eye, the accumulation of bacteria can cause eye infections and even serious damage to vision. Therefore, there is an urgent need for a corneal molding lens surface treatment technology that can effectively and durably provide antibacterial protection.

[0004] Currently, the existing corneal molding lenses still have many shortcomings:

[0005] Limited antibacterial performance: The surface treatment technology of traditional corneal molding lenses usually does not consider long-term effective antibacterial function. This leads to the accumulation of bacteria and other microorganisms on the lens surface, increasing the risk of eye infection, especially for users who wear them for a long time.

[0006] Biocompatibility and comfort issues: The existing corneal molding lens materials do not fully consider the biocompatibility and comfort of the eye. This causes the wearer to feel eye discomfort, and even causes mild irritation or inflammation.

[0007] Lack of self-cleaning ability: Traditional corneal molding lens surface treatment technology usually does not contain self-cleaning function. This means that the lens may need more frequent and meticulous cleaning to prevent the accumulation of contaminants and microorganisms.

[0008] Durability and stability issues: Many existing technologies show material degradation or a decrease in antibacterial effect during long-term use. This limits the service life of the lens and causes long-term wearers to need to replace the lens more frequently.

[0009] Insufficient safety considerations: In some existing technologies, the long-term effects on eye safety have not been fully considered, especially changes in materials that may occur during repeated use and cleaning.

[0010] In summary, existing technologies have significant shortcomings in terms of antibacterial properties, biocompatibility, self-cleaning ability, durability, and safety. These shortcomings highlight the necessity of developing a new type of orthokeratology lens with improved properties, especially in ensuring the eye health and comfort of long-term wearers. Summary of the Invention

[0011] The purpose of this invention is to provide a method and apparatus for forming an antibacterial layer on the surface of orthokeratology lenses using vapor deposition. This method not only improves the safety and comfort of orthokeratology lenses, but also significantly enhances their antibacterial ability, thereby protecting the wearer's eye health and extending the lifespan of the lenses.

[0012] The technical solution adopted in this invention is as follows:

[0013] A method for forming an antibacterial layer on the surface of an orthokeratology lens using vapor deposition, characterized by comprising the following steps:

[0014] Polydimethylsiloxane (PDMS), silver nanoparticles, and nano-sized titanium dioxide (TiO2) were sequentially deposited on the surface of orthokeratology lenses using chemical vapor deposition.

[0015] The PDMS deposition process is controlled at a temperature of 150°C to 200°C, a pressure of 1 to 2 Torr, and a deposition time of 10 to 20 minutes.

[0016] The temperature for the silver nanoparticle deposition process was controlled at 200°C to 250°C, the pressure at 0.5 to 1.5 Torr, and the deposition time at 15 to 30 minutes.

[0017] The temperature for the TiO2 nanoparticle deposition process was controlled at 250℃ to 300℃, the pressure at 0.8 to 1.5 Torr, and the deposition time at 20 to 40 minutes.

[0018] The precursor of the silver nanoparticles is selected from silver acetic acid or silver hexafluoroacetate.

[0019] The precursor of PDMS is hexamethyldisilazane.

[0020] The precursor of TiO2 is selected from titanium tetrachloride or titanium tartrate.

[0021] The method also includes a step of thoroughly cleaning the surface of the orthokeratology lens before the deposition step:

[0022] Soak the orthokeratology lenses in deionized water for 5 to 10 minutes.

[0023] Use an ultrasonic cleaning device to perform ultrasonic cleaning on the soaked orthokeratology lenses at a frequency of 40 kHz to 100 kHz for 15 to 30 minutes.

[0024] Dry the cleaned orthokeratology lenses under a clean airflow or gently wipe them clean with a clean paper towel;

[0025] In a cleanroom environment, plasma surface treatment technology is used to further clean the surface of the orthokeratology lens, with the treatment time controlled between 1 and 5 minutes, in order to remove organic and inorganic residues from the surface.

[0026] After plasma treatment, the orthokeratology lens is gently rinsed again with deionized water and then thoroughly dried under a dust-free airflow.

[0027] The method also includes a step of conducting biocompatibility and safety tests on the deposited orthokeratology lenses:

[0028] Skin irritation test: The treated orthokeratology lens was applied to the skin of the experimental animal and observed for at least 72 hours; any signs of redness, inflammation or irritation were recorded and compared with the untreated control group;

[0029] Cytotoxicity test: Cytotoxicity test was performed using human corneal epithelial cell culture; extracts from orthokeratology lenses were added to the cell culture and cultured for 48 to 72 hours; cell viability and proliferation were assessed using MTT or other similar cell viability assays.

[0030] Eye irritation test: Insert the treated orthokeratology lens into the eye of the experimental animal and observe for at least 7 days; record any signs of congestion, increased tearing, or corneal damage;

[0031] Reuse test: Long-term repeated use of treated orthokeratology lenses to simulate real-world usage conditions; observe the stability of the lens, material degradation, and its long-term effects on cells and tissues;

[0032] Microbial challenge testing: The treated orthokeratology lenses are exposed to specific strains (such as Staphylococcus aureus and Escherichia coli) to assess the effectiveness of the antimicrobial layer; colony counts are periodically tested to verify the durability of the antimicrobial properties.

[0033] The chemical vapor deposition (CVD) is performed using a deposition system, which includes a deposition chamber, a gas delivery system for transporting different precursor gases, a temperature control system for controlling the temperature inside the deposition chamber, and a pressure control system for maintaining the pressure environment required for deposition. A lens support is installed inside the deposition chamber. The lens support comprises multiple support rods arranged in a divergent, centrally symmetrical pattern. The support rods are vertically positioned in the middle and lower parts, and curved outwards at the top to provide support. A cylindrical base is positioned between the multiple support rods. Several first electric actuators are horizontally embedded on the circumferential surface of the cylindrical base, corresponding to the support rods. The system controls the outward translation of the support rods; a suction mechanism is provided in the space between the multiple support rods above the cylindrical base; the suction mechanism includes multiple elastic and recoverable suction bars; the lower ends of the suction bars are fixedly connected to a support block, and the upper ends are ball-connected to a miniature suction cup; a pulse suction tube is connected to the miniature suction cup; a second electric actuator is provided on the upper surface of the cylindrical base corresponding to the support block to control the lifting and lowering of the support block; the lens holder also includes an outer cylinder; on the inner circumference of the outer cylinder, slots are vertically opened corresponding to the support rods, and the slots can fit into the outer ends of the support rods; a third electric actuator drives the cylindrical base to lift and lower.

[0034] Among them, miniature pressure sensors are embedded in the parts where the support rod contacts the edge of the orthokeratology lens; and miniature torque sensors are installed on the adsorption strip.

[0035] The upper end and outer circumference of the outer cylinder are slightly convex arc surfaces; the upper end of the support rod is also arc surface, and an air outlet slit is opened near the upper end; the air outlet slit connects to the upper end of the outer cylinder after the support rod descends and fits into the slot, and the arc surface at the connection between the air outlet slit and the outer cylinder is tangent; the lower end of the air outlet slit connects to the internal cavity of the outer cylinder.

[0036] The lens fixation method for the chemical vapor deposition system is as follows:

[0037] ① The orthokeratology lens is placed in the support space enclosed by multiple support rods and is supported by multiple support rods simultaneously;

[0038] ② The control device controls the first electric push rod to retract, so that the clamping part at the top of the support rod contacts the edge of the orthokeratology lens. The first electric push rod stops after the pressure sensed by the micro pressure sensor reaches the preset threshold.

[0039] ③ The control device controls the extension of the second electric push rod until the bending degree of the suction strip sensed by the torque sensor reaches the preset threshold, at which point the second electric push rod stops; at this time, the micro suction cup contacts the bottom surface of the orthokeratology lens;

[0040] ④ The control device controls the pulse suction tube to draw air in pulses, creating negative pressure inside the micro suction cup, which adsorbs and fixes the orthokeratology lens.

[0041] ⑤ The control device controls the third electric push rod to retract to the preset length. After retraction, the upper end of the support rod fits into the groove of the outer cylinder, and the air outlet slit connects with the arc surface at the junction of the outer cylinder.

[0042] ⑥ Inert gas is introduced into the outer cylinder from the bottom. The inert gas is squeezed out from the air outlet slit and flows downward along the outer arc surface of the outer cylinder under the action of the Coanda effect. The gas outlet component of the gas delivery system is located above the corneal reshaping lens. The gas flowing downward along the outer cylinder forms a pressure field, which guides the deposited gas phase to be evenly distributed on the upper surface of the corneal reshaping lens; at the same time, it prevents the deposited gas phase from entering the outer cylinder.

[0043] ⑦ After deposition is completed, a certain pulsed airflow is reversed through the pulse suction tube to create positive pressure inside the micro suction cup, thereby releasing the fixation effect between the micro suction cup and the orthokeratology lens.

[0044] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0045] 1. This invention utilizes vapor deposition to form an antibacterial layer on the surface of orthokeratology lenses, comprising polydimethylsiloxane (PDMS), silver nanoparticles, and nano-sized titanium dioxide (TiO2), bringing about multiple beneficial effects:

[0046] Improved biocompatibility and reduced irritation: Polydimethylsiloxane (PDMS) is a silicon-based polymer material with excellent biocompatibility. It is widely used in the medical field due to its low irritation to human tissues and good stability. Depositing PDMS on the surface of orthokeratology lenses can increase lens comfort and reduce eye irritation.

[0047] Antibacterial properties of silver nanoparticles: Silver nanoparticles are widely recognized for their powerful antibacterial properties. They can effectively kill or inhibit the growth of bacteria, fungi, and certain viruses. Depositing silver nanoparticles on orthokeratology lenses can effectively prevent the accumulation and growth of bacteria, thereby reducing the risk of eye infections.

[0048] Antibacterial and self-cleaning properties of titanium dioxide (TiO2): Nanoscale titanium dioxide exhibits excellent photocatalytic properties. Under ultraviolet light irradiation, TiO2 can generate highly oxidizing free radicals, which helps to decompose and remove organic matter and microorganisms attached to the surface, thus exerting antibacterial and self-cleaning effects.

[0049] Synergistic effect and long-lasting effect: The combination of the three materials produces a synergistic effect, enhancing antibacterial properties while maintaining lens breathability and comfort. Furthermore, this multi-layered composite structure offers better stability and durability compared to a single material, thus maintaining its antibacterial properties over long-term use.

[0050] Safety and Durability: The combination of these materials also enhances the overall durability and safety of orthokeratology lenses. PDMS provides a physical protective layer, while silver nanoparticles and TiO2 offer long-lasting and effective antibacterial protection.

[0051] In conclusion, this combination of multi-layered materials not only improves the safety and comfort of orthokeratology lenses, but also significantly enhances their antibacterial properties, thereby protecting the wearer's eye health and extending the lens's lifespan.

[0052] 2. The deposition system and related components of this invention provide many beneficial effects in the chemical vapor deposition process, especially in achieving uniform and precise coating deposition on the surface of orthokeratology lenses:

[0053] The divergent, centrally symmetrical distribution and adjustable design of the support rods allow for precise support and fixation of the orthokeratology lens. This eliminates the need for excessive force when placing the lens, avoiding overly high precision requirements or lens abrasion. It also ensures automatic adjustment and fixation after placement, guaranteeing the stability of the lens during the deposition process.

[0054] The installation of miniature pressure and torque sensors on the support rods and suction bars allows for precise monitoring and adjustment of the pressure and suction force in contact with the lens, ensuring the lens is fixed while avoiding excessive pressure that could damage it, and providing the lens with appropriate clamping force.

[0055] The multi-step fixation method (clamping, adsorption, positioning) is not only highly automated, ensuring that the orthokeratology lens is not damaged, but also guarantees the precise position and firm fixation of the orthokeratology lens during the deposition process.

[0056] Through the Coanda effect, the inert gas squeezed out from the slits of the outer cylinder flows downwards along the outer arc of the cylinder, creating a pressure field that helps guide the deposited gas phase to distribute evenly on the surface of the orthokeratology lens. Compared to natural deposition, this invention provides a certain degree of active force and directional guidance, perfectly matching the arc shape of the lens surface, thus significantly improving deposition speed and production efficiency. Furthermore, this gas flow design helps prevent the deposited gas phase from entering the inner part of the outer cylinder, thereby avoiding contamination of the equipment interior or affecting the deposition effect. Existing gas phases tend to deposit on the lens holder, which can lead to the following disadvantages: Impact on deposition quality: Unnecessary deposition on the lens holder can lead to waste of gas phase material and also affect the uniformity and consistency of the coating on the lens. This is because unplanned deposition can alter the local conditions of airflow dynamics and chemical reactions. Difficulty in cleaning and maintenance: Deposits on the lens holder increase the difficulty of cleaning and maintaining the equipment. Long-term accumulation may lead to a decline in equipment performance, and even require more frequent maintenance or component replacement. Shortened equipment lifespan: Frequent cleaning and maintenance, as well as the potential corrosive effect of deposits on the support structure, will shorten the lifespan of the equipment. Decreased production efficiency: Frequent cleaning of deposits on the lens holder leads to decreased production efficiency and increased production costs. This invention, through a combination of precise gas flow control and a fixing mechanism, effectively prevents gaseous phase deposition on the lens holder, thereby ensuring high-quality lens coatings and high-efficiency production processes. Simultaneously, it reduces equipment maintenance costs and extends equipment lifespan. Furthermore, because the lens holder of this invention is specially designed, utilizing telescopic and elastic mechanisms, preventing gaseous phase deposition is crucial for realizing other functionalities of the lens holder structure.

[0057] The system's precise control and optimized design improve overall deposition efficiency and quality while reducing material waste and production costs. The system's design also helps protect lenses from physical damage during the process, ensuring the safety of the production process and the integrity of the lenses.

[0058] In summary, the deposition system and its supporting control mechanism of this invention provide an automated, low-precision placement mechanism for orthokeratology lenses, which can automatically adjust its position, provide stable fixation without damaging the lens, and provide precise control for chemical vapor deposition, ensuring the uniformity, quality and efficiency of the coating on the surface of the orthokeratology lens, while improving the safety and reliability of the production process. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the lens holder structure when the orthokeratology lens of the present invention is first placed on the lens holder;

[0060] Figure 2This is a schematic diagram of the structure of the lens holder of the present invention when adjusting the position of the orthokeratology lens and fixing it.

[0061] Figure 3 This is a schematic diagram of the structure at the start of deposition in this invention;

[0062] Figure 4 for Figure 3 Enlarged view of the area within the middle circle;

[0063] Figure 5 This is a top view schematic diagram of the lens holder and orthokeratology lens of the present invention.

[0064] The markings in the diagram are: 1. Lens support; 11. Support rod; 111. Air outlet slit; 112. Miniature pressure sensor; 12. Cylindrical base; 121. First electric actuator; 13. Suction mechanism; 14. Suction strip; 15. Support block; 16. Miniature suction cup; 17. Second electric actuator; 18. Outer cylinder; 19. Groove; 20. Third electric actuator; 2. Orthokeratology lens. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0066] A method for forming an antibacterial layer on the surface of an orthokeratology lens using vapor deposition, characterized by comprising the following steps:

[0067] Polydimethylsiloxane (PDMS), silver nanoparticles, and nano-sized titanium dioxide (TiO2) were sequentially deposited on the surface of orthokeratology lenses using chemical vapor deposition.

[0068] Furthermore, the temperature of the PDMS deposition process is controlled at 150°C to 200°C, the pressure is 1 to 2 Torr, and the deposition time is 10 to 20 minutes;

[0069] The temperature for the silver nanoparticle deposition process was controlled at 200°C to 250°C, the pressure at 0.5 to 1.5 Torr, and the deposition time at 15 to 30 minutes.

[0070] The temperature for the TiO2 nanoparticle deposition process was controlled at 250℃ to 300℃, the pressure at 0.8 to 1.5 Torr, and the deposition time at 20 to 40 minutes.

[0071] Furthermore, the precursors for the silver nanoparticles are selected from silver acetic acid or silver hexafluoroacetate.

[0072] Furthermore, the precursor of PDMS is hexamethyldisilazane.

[0073] Furthermore, the precursor of TiO2 is selected from titanium tetrachloride or titanium tartrate.

[0074] Furthermore, the method also includes a step of thoroughly cleaning the surface of the orthokeratology lens prior to the deposition step:

[0075] Soak the orthokeratology lenses in deionized water for 5 to 10 minutes.

[0076] Use an ultrasonic cleaning device to perform ultrasonic cleaning on the soaked orthokeratology lenses at a frequency of 40 kHz to 100 kHz for 15 to 30 minutes.

[0077] Dry the cleaned orthokeratology lenses under a clean airflow or gently wipe them clean with a clean paper towel;

[0078] In a cleanroom environment, plasma surface treatment technology is used to further clean the surface of the orthokeratology lens, with the treatment time controlled between 1 and 5 minutes, in order to remove organic and inorganic residues from the surface.

[0079] After plasma treatment, the orthokeratology lens is gently rinsed again with deionized water and then thoroughly dried under a dust-free airflow.

[0080] Furthermore, the method also includes steps for conducting biocompatibility and safety tests on the deposited orthokeratology lenses:

[0081] Skin irritation test: The treated orthokeratology lens was applied to the skin of the experimental animal and observed for at least 72 hours; any signs of redness, inflammation or irritation were recorded and compared with the untreated control group;

[0082] Cytotoxicity test: Cytotoxicity test was performed using human corneal epithelial cell culture; extracts from orthokeratology lenses were added to the cell culture and cultured for 48 to 72 hours; cell viability and proliferation were assessed using MTT or other similar cell viability assays.

[0083] Eye irritation test: Insert the treated orthokeratology lens into the eye of the experimental animal and observe for at least 7 days; record any signs of congestion, increased tearing, or corneal damage;

[0084] Reuse test: Long-term repeated use of treated orthokeratology lenses to simulate real-world usage conditions; observe the stability of the lens, material degradation, and its long-term effects on cells and tissues;

[0085] Microbial challenge testing: The treated orthokeratology lenses are exposed to specific strains (such as Staphylococcus aureus and Escherichia coli) to assess the effectiveness of the antimicrobial layer; colony counts are periodically tested to verify the durability of the antimicrobial properties.

[0086] The following is the test record:

[0087]

[0088] Among them, the antibacterial rate (%) measures the inhibitory effect of the deposition layer on bacteria. A high antibacterial rate indicates better antibacterial performance.

[0089] Skin irritation and cytotoxicity tests: used to assess the biocompatibility of materials. "Non-irritant" and "non-toxic" indicate that the material is very safe for biological tissues.

[0090] Reusability and microbial challenge testing: assessing the stability of the material and the durability of the antimicrobial layer during long-term use.

[0091] Deposition uniformity: reflects the evenness of the distribution of the deposited layer on the surface of the orthokeratology lens. High uniformity means better coverage and consistency.

[0092] Deposition thickness (nm): Affects the physical properties and oxygen permeability of the material.

[0093] Antibacterial properties:

[0094] Experiment 5 showed the highest antimicrobial rate (95%), indicating that its deposition parameter settings optimized the effectiveness of the antimicrobial layer.

[0095] Compared with the control product, all test configurations showed higher antibacterial rates, indicating that the proposed deposition method is superior to existing mainstream products in terms of antibacterial performance.

[0096] Biocompatibility:

[0097] Tests 5, 2, and 4 all showed "no irritation" and "no toxicity" in skin irritation and cytotoxicity tests, indicating that the materials in these formulations are very safe for biological tissues and have excellent biocompatibility.

[0098] In contrast, the control products showed only mild irritation or toxicity, indicating that the new deposition method has a clear advantage in reducing bioirritation.

[0099] Service life and stability:

[0100] In reusability and microbial challenge tests, tests 5, 1, and 4 demonstrated high stability and durability, indicating that these setups can maintain good performance over long-term use.

[0101] These results demonstrate that optimizing deposition parameters can significantly improve the lifespan and durability of orthokeratology lenses.

[0102] Deposition uniformity and thickness:

[0103] High deposition uniformity and moderate deposition thickness were achieved in Experiment 5, which is crucial for ensuring coverage, oxygen permeability and comfort.

[0104] The deposition thickness in Experiment 5 was 130nm, which is a balance that ensures sufficient antibacterial layer thickness without excessively affecting the lens's breathability and transparency.

[0105] in conclusion:

[0106] In conclusion, the setup in Experiment 5 demonstrated the best performance in terms of antibacterial properties, biocompatibility, service life, and deposition quality. This experimental configuration (PDMS deposition temperature 190℃, pressure 1.8 Torr, time 18 min; silver nanoparticle deposition temperature 240℃, pressure 1.3 Torr, time 27 min; TiO2 nanoparticle deposition temperature 290℃, pressure 1.4 Torr, time 35 min) provided the optimal antibacterial layer while maintaining high biocompatibility and good physical stability.

[0107] This indicates that by precisely controlling the parameters of chemical vapor deposition, the antibacterial properties and safety of orthokeratology lenses can be significantly improved, while extending their lifespan. These findings provide valuable guidance for further research and development and may have a positive impact on improving the overall quality and safety of orthokeratology lenses.

[0108] Further, see Figures 1 to 5Chemical vapor deposition is performed using a deposition system, which includes a deposition chamber, a gas delivery system for transporting different precursor gases, a temperature control system for controlling the temperature inside the deposition chamber, and a pressure control system for maintaining the pressure environment required for deposition. A lens holder 1 is installed inside the deposition chamber. The lens holder 1 includes multiple support rods 11 arranged in a divergent, centrally symmetrical pattern. The support rods 11 are vertically positioned in the middle and lower parts, and curved outwards at the top to provide support. A cylindrical base 12 is positioned between the multiple support rods 11. Several first electric actuators 121 are horizontally embedded on the circumferential surface of the cylindrical base 12, corresponding to the support rods 11, to control the outward translation of the support rods 11. A suction mechanism 13 is provided in the space between the multiple support rods 11 above the cylindrical base 12; the suction mechanism 13 includes multiple elastic and recoverable suction strips 14; the lower ends of the suction strips 14 are fixedly connected to a support block 15, and the upper ends are ball-connected to a miniature suction cup 16; a pulse suction tube is connected to the miniature suction cup 16; a second electric push rod 17 is provided on the upper end of the cylindrical base 12 corresponding to the support block 15 to control the lifting and lowering of the support block 15; the lens bracket 1 also includes an outer cylinder 18; on the inner circumferential surface of the outer cylinder 18, slots 19 are vertically opened corresponding to the support rods 11, and the slots 19 can be fitted with the outer ends of the support rods 11; a third electric push rod 20 drives the cylindrical base 12 to lift and lower.

[0109] Furthermore, miniature pressure sensors 112 are embedded in the parts where the support rod 11 contacts the edge of the orthokeratology lens 2; a miniature torque sensor is provided on the adsorption strip 14.

[0110] Furthermore, the upper end and outer circumferential surface of the outer cylinder 18 are slightly convex arc surfaces; the upper end of the support rod 11 is also an arc surface, and an air outlet slit 111 is opened near the upper end; after the support rod 11 descends and fits into the slot 19, the air outlet slit 111 connects with the upper end of the outer cylinder 18, and the arc surface at the connection between the air outlet slit 111 and the outer cylinder 18 is tangent; the lower end of the air outlet slit 111 connects to the internal cavity of the outer cylinder 18.

[0111] Furthermore, the lens fixation method for chemical vapor deposition using the deposition system is as follows:

[0112] ① The orthokeratology lens 2 is placed on the support space enclosed by multiple support rods 11, and is supported by multiple support rods 11 at the same time;

[0113] ② The control device controls the first electric push rod 121 to retract, so that the clamping part at the top of the support rod 11 contacts the edge of the corneal reshaping lens 2. The first electric push rod 121 stops after the pressure sensed by the micro pressure sensor 112 reaches the preset threshold.

[0114] ③ The control device controls the extension of the second electric push rod 17 until the bending degree of the adsorption support 14 sensed by the torque sensor reaches the preset threshold, at which point the second electric push rod 17 stops; at this time, the micro suction cup 16 contacts the bottom surface of the corneal reshaping lens 2.

[0115] ④ The control device controls the pulse suction tube to draw air in a pulse, so that a negative pressure is formed inside the micro suction cup 16, which adsorbs the corneal reshaping lens 2 and fixes it in place.

[0116] ⑤ The control device controls the third electric push rod 20 to retract to a preset length. After the retraction is completed, the upper end of the support rod 11 fits into the slot 19 of the outer cylinder 18, and the arc surface of the air outlet slit 111 connects with the outer cylinder 18.

[0117] ⑥ Inert gas is introduced into the outer cylinder 18 from the lower part of the outer cylinder 18. The inert gas is squeezed out from the air outlet slit 111 and flows downward along the outer arc surface of the outer cylinder 18 under the action of the Coanda effect. The gas outlet component of the gas delivery system is located above the corneal reshaping lens 2. The gas flowing downward along the outer cylinder 18 forms a pressure field, which guides the deposited gas phase to be evenly distributed on the upper surface of the corneal reshaping lens 2; at the same time, it prevents the deposited gas phase from entering the outer cylinder 18.

[0118] ⑦ After deposition is completed, a certain pulsed airflow is reversed to the micro suction cup 16 through the pulse suction tube, so that the micro suction cup 16 has positive pressure, thereby releasing the fixation effect between the micro suction cup 16 and the corneal reshaping lens 2.

[0119] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A deposition system for vapor deposition of orthokeratology lenses, characterized in that: The system includes a deposition chamber, a gas delivery system for conveying different precursor gases, a temperature control system for controlling the temperature inside the deposition chamber, and a pressure control system for maintaining the pressure environment required for deposition. A lens support (1) is installed inside the deposition chamber. The lens support (1) includes multiple support rods (11) arranged in a divergent, centrally symmetrical pattern. The support rods (11) are vertically positioned in the middle and lower parts, and curved outwards at the top to provide support. A cylindrical base (12) is provided between the multiple support rods (11). Several first electric actuators (121) are horizontally embedded on the side circumference of the cylindrical base (12) corresponding to the support rods (11) to control the outward translation of the support rods (11). The space between the multiple support rods (11) above the cylindrical base (12)... A suction mechanism (13) is provided in the space; the suction mechanism (13) includes multiple elastic and recoverable suction strips (14); the lower ends of the suction strips (14) are fixedly connected to a support block (15), and the upper ends are ball-connected to a miniature suction cup (16); a pulse suction tube is connected to the miniature suction cup (16); a second electric push rod (17) is provided on the upper end of the cylindrical base (12) corresponding to the support block (15) to control the lifting and lowering of the support block (15); the lens bracket (1) also includes an outer cylinder (18); on the inner circumference of the outer cylinder (18), slots (19) are vertically opened on the corresponding bracket rods (11), and the slots (19) can be fitted with the outer ends of the bracket rods (11); a third electric push rod (20) drives the cylindrical base (12) to lift and lower.

2. The deposition system for orthokeratology lens vapor deposition as described in claim 1, characterized in that: Miniature pressure sensors (112) are embedded in the parts where the support rod (11) contacts the edge of the corneal reshaping lens (2); a miniature torque sensor is provided on the adsorption strip (14).

3. The deposition system for orthokeratology lens vapor deposition as described in claim 2, characterized in that: The upper end and outer circumference of the outer cylinder (18) are slightly convex arc surfaces; the upper end of the support rod (11) is also arc surface, and an air outlet slit (111) is opened near the upper end; the air outlet slit (111) connects with the upper end of the outer cylinder (18) after the support rod (11) descends and fits into the slot (19), and the arc surface at the connection between the air outlet slit (111) and the outer cylinder (18) is tangent; the lower end of the air outlet slit (111) connects to the internal cavity of the outer cylinder (18).

4. The deposition system for orthokeratology lens vapor deposition as described in claim 3, characterized in that, The lens fixing method of the deposition system is as follows: ① The orthokeratology lens (2) is placed on the support space enclosed by multiple support rods (11) and is supported by multiple support rods (11) at the same time; ② The control device controls the first electric push rod (121) to retract, so that the clamping part at the top of the support rod (11) contacts the edge of the corneal reshaping lens (2). The first electric push rod (121) stops after the pressure sensed by the micro pressure sensor (112) reaches the preset threshold. ③ The control device controls the extension of the second electric push rod (17) until the bending degree of the adsorption support strip (14) sensed by the torque sensor reaches the preset threshold and then the second electric push rod (17) stops; at this time, the micro suction cup (16) contacts the bottom surface of the corneal reshaping lens (2); ④ The control device controls the pulse suction tube to draw air in a pulse, so that a negative pressure is formed inside the micro suction cup (16) to adsorb the corneal reshaping lens (2) and fix it in place; ⑤ The control device controls the third electric push rod (20) to retract to the preset length. After the retraction is completed, the upper end of the support rod (11) fits into the slot (19) of the outer cylinder (18), and the arc surface of the air outlet slit (111) and the outer cylinder (18) are connected. ⑥ Inert gas is introduced into the outer cylinder (18) from the lower part. The inert gas is squeezed out from the air outlet slit (111) and flows downward along the outer arc surface of the outer cylinder (18) under the action of the Coanda effect. The gas outlet component of the gas delivery system is located above the corneal reshaping lens (2). The gas flowing downward along the outer cylinder (18) forms a pressure field, which guides the deposited gas phase to be evenly distributed on the upper surface of the corneal reshaping lens (2); at the same time, it prevents the deposited gas phase from entering the outer cylinder (18). ⑦ After deposition, a certain pulsed airflow is given to the micro suction cup (16) in reverse through the pulse suction tube, so that the micro suction cup (16) has positive pressure, thereby releasing the fixation effect between the micro suction cup (16) and the corneal reshaping lens (2).

Images