Wireless sensing contact lens and preparation method thereof

Abstract

The invention discloses a wireless sensing contact lens and a preparation method thereof, and belongs to the technical field of intelligent contact lenses, the wireless sensing contact lens comprises a contact lens matrix, a sensing communication line and a magnetic flux enhancement line; a base body of the contact lens is provided with a central optical area, an inner surface and an outer surface, the central optical area is used for giving a light path for pupils, the inner surface is a surface in contact with eyeballs, and the outer surface and the inner surface are oppositely arranged; the sensing communication line is made of a conductive material, and the sensing communication line is arranged on the outer surface and surrounds the central optical area, so that a light hole is reserved in the central optical area; the material of the magnetic flux enhancing circuit comprises a magnetic conductive material, and the magnetic flux enhancing circuit is arranged on the inner surface and arranged around the central optical area in an end-to-end connection mode so that a light hole can be reserved in the central optical area. The magnetic lines are attracted and concentrated through the magnetic flux enhancement circuit, so that the coupling coefficient of the magnetic lines is improved, and the energy and data transmission efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of intelligent contact lenses, and particularly relates to a wireless sensing contact lens and a preparation method thereof. BACKGROUND

[0002] With the development of technology, intelligent contact lenses have become a research hotspot in the fields of medical monitoring, augmented reality (AR) and human-computer interaction. Traditional intelligent contact lenses usually form a functional layer by integrating sensors, circuits, antennas and other micro functional elements on the lens body to realize corresponding functions.

[0003] However, the data transmission of the functional layer depends on the magnetic coupling between the external read-write device and the micro functional unit. At present, the main methods for integrating the functional layer include direct printing, micro-electro-mechanical system (MEMS) processing and sandwich packaging. However, these methods have many limitations, affecting the magnetic coupling performance, resulting in reduced efficiency of energy transmission and data transmission. Direct printing: it is difficult to realize high-precision and high-adhesion patterned printing on soft and curved contact lens substrates, and usually only single-sided functionalization can be achieved.

[0004] MEMS processing: complex process, high cost, not suitable for mass production, poor compatibility with flexible biocompatible substrates, and unable to ensure the reliability of micro functional elements.

[0005] Sandwich packaging: the functional layer is sandwiched between two pieces of hydrogel material, but this method has low interlayer alignment accuracy and weak interfacial bonding force, which reduces the reliability of the micro functional elements in functional implementation, and the overall thickness of the lens increases, affecting the wearing comfort. SUMMARY

[0006] The application develops a wireless sensing contact lens and a preparation method thereof, aiming to solve the technical problem of reduced efficiency of energy transmission and data transmission caused by the influence of magnetic coupling performance in the prior art.

[0007] Technical scheme: In a first aspect, the embodiments of the application provide a wireless sensing contact lens, comprising: a contact lens substrate, the contact lens substrate having a central optical zone, an inner surface for contacting an eyeball, and an outer surface disposed opposite the inner surface; a sensing communication circuit, the sensing communication circuit being disposed on the outer surface and surrounding the central optical zone; the material of the sensing communication circuit comprising a conductive material; a magnetic flux enhancement circuit, the magnetic flux enhancement circuit being disposed on the inner surface and connected at the head and tail around the central optical zone; the material of the magnetic flux enhancement circuit comprising a magnetic conductive material.

[0008] In some embodiments, the diameter of the magnetic flux enhancement circuit ranges from d mm, with the center of the central optical zone as the center, satisfying: 4≤d≤7.

[0009] In some embodiments, the magnetic conductive material comprises neodymium iron boron powder and resin.

[0010] In some embodiments, the mass ratio of the neodymium iron boron powder in the magnetic conductive material is 40% ~ 70%.

[0011] In some embodiments, the mass ratio of the neodymium iron boron powder in the magnetic conductive material is 60%.

[0012] In some embodiments, the sensing communication circuit is spiral-shaped, and the characteristic formula of the sensing communication circuit comprises: ; wherein, is the vacuum permeability; is the number of turns of the coil; is the average diameter of the coil; is the filling factor related to the shape of the coil; is the inductance.

[0013] In some embodiments, the line width of the coil is b μm, satisfying: 10≤b≤50; The center distance between the coil layers is a μm, satisfying: 50≤a≤100.

[0014] In some embodiments, a=75.

[0015] In some embodiments, b=25.

[0016] In a second aspect, the embodiments of the present application also provide a preparation method of a wireless sensing contact lens, for preparing the wireless sensing contact lens of any one of the first aspect, the preparation method comprising: configuring a female mold and a male mold; disposing the conductive material on the inner surface of the forming cavity of the female mold to form a sensing communication circuit; disposing the magnetic conductive material on the outer surface of the forming end of the male mold to form a magnetic flux enhancement circuit; injecting a liquid hydrogel prepolymer into the forming cavity of the female mold; aligning the forming end of the male mold with the forming cavity of the female mold; pressing the male mold and the female mold together, so that the hydrogel prepolymer is filled between the male mold and the female mold, and the sensing communication circuit and the magnetic flux enhancement circuit are respectively embedded in the hydrogel prepolymer; The mold after closing is irradiated by ultraviolet light or heated, so that the hydrogel prepolymer is cured, and the sensing communication line and the magnetic flux enhancement line are combined into one, to obtain a solid contact lens precursor; The solid contact lens precursor is immersed in physiological saline to hydrate and expand, to obtain the wireless sensing contact lens.

[0017] Advantages: Compared with the prior art, the wireless sensing contact lens provided by the embodiment of the application comprises a contact lens substrate, a sensing communication line and a magnetic flux enhancement line. The contact lens substrate in the application has a central optical area, an inner surface and an outer surface. The central optical area is used to leave a light path for the pupil. The inner surface is a surface in contact with the eyeball. The outer surface is arranged opposite to the inner surface. The sensing communication line is made of conductive material. The sensing communication line is arranged on the outer surface and surrounds the central optical area to leave a light transmission hole for the central optical area. The magnetic flux enhancement line is made of magnetic material. The magnetic flux enhancement line is arranged on the inner surface and is connected at the head and tail to surround the central optical area to leave a light transmission hole for the central optical area. In the application, the sensing communication line is arranged on the outer surface, and the magnetic flux enhancement line is arranged on the inner surface. When the sensing communication line and the external read-write device perform energy and data transmission through magnetic coupling, the magnetic flux enhancement line attracts and concentrates magnetic lines, so that the magnetic lines pass through the sensing communication line more effectively, to improve the coupling coefficient of the magnetic lines and the energy and data transmission efficiency.

[0018] Meanwhile, the embodiment of the application further provides a preparation method of the wireless sensing contact lens, comprising configuring a female mold and a male mold; arranging conductive material on the inner surface of the forming cavity of the female mold to form a sensing communication line; arranging magnetic material on the outer surface of the forming end of the male mold to form a magnetic flux enhancement line; injecting liquid hydrogel prepolymer into the forming cavity of the female mold; aligning the forming end of the male mold with the forming cavity of the female mold; pressing the male mold and the female mold to make the hydrogel prepolymer fill between the male mold and the female mold, and the sensing communication line and the magnetic flux enhancement line are embedded in the hydrogel prepolymer respectively; irradiating the mold after closing by ultraviolet light or heating, so that the hydrogel prepolymer is cured, and the sensing communication line and the magnetic flux enhancement line are combined into one, to obtain a solid contact lens precursor; and immersing the solid contact lens precursor in physiological saline to hydrate and expand, to obtain the wireless sensing contact lens. In the application, the sensing communication line and the magnetic flux enhancement line are printed on different molds respectively, and then liquid matrix is injected into the molds. After the molds are closed, the sensing communication line and the magnetic flux enhancement line are cured and embedded on the outer surface and the inner surface of the contact lens substrate. Through embedded transfer printing, the sensing communication line and the magnetic flux enhancement line are formed at the same time as the contact lens substrate, to enhance the interface bonding force, reduce the falling off, improve the stability and reliability of the sensing communication line during work, reduce the influence on magnetic coupling, and ensure the energy and data transmission efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 A structural diagram of a sensing communication line in a wireless sensing contact lens is provided for the embodiments of the present application. Figure 2 A structural diagram of a magnetic flux enhancement line in a wireless sensing contact lens is provided for the embodiments of the present application. Figure 3 A cross-sectional structural schematic diagram of a wireless sensing contact lens is provided for the embodiments of the present application. Figure 4 A flowchart of a preparation method of a wireless sensing contact lens is provided for the embodiments of the present application. Figure 5 A step flowchart of a preparation method of a wireless sensing contact lens is provided for the embodiments of the present application. Figure 6 A comparison diagram of signal strength of a single functional layer contact lens and a wireless sensing contact lens provided by the embodiments of the present application. Figure 5 A comparison diagram of signal strength of a single functional layer contact lens and a wireless sensing contact lens provided by the embodiments of the present application. Reference signs: 10, contact lens base; 20, sensing communication line; 30, magnetic flux enhancement line. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0022] With the development of technology, intelligent contact lenses have become a research hotspot in the fields of medical monitoring, augmented reality (AR), and human-computer interaction. Traditional intelligent contact lenses usually form a functional layer by integrating sensors, circuits, antennas, and other micro functional elements on the lens body to realize corresponding functions.

[0023] However, the data transmission of the functional layer depends on the magnetic coupling between the external read-write device and the micro functional unit. At present, the main methods for integrating the functional layer include direct printing, micro-electro-mechanical system (MEMS) processing, and sandwich packaging. However, these methods have many limitations, affecting the magnetic coupling performance, resulting in reduced efficiency of energy transmission and data transmission: Direct printing: It is difficult to achieve high-precision, high-adhesion patterned printing on soft, curved contact lens substrates, and it can usually only achieve single-sided functionality.

[0024] MEMS fabrication: The process is complex and costly, making it unsuitable for large-scale production. Furthermore, it has poor compatibility with flexible biocompatible substrates, which cannot guarantee the reliability of micro-functional components.

[0025] Sandwich encapsulation: The functional layer is sandwiched between two pieces of hydrogel material. However, this method has problems such as low interlayer alignment accuracy and weak interfacial bonding, which reduces the reliability of micro-functional components when realizing their functions. At the same time, the overall thickness of the lens increases, affecting wearing comfort.

[0026] In view of this, embodiments of this application provide a wireless sensing contact lens; please refer to [link to relevant documentation]. Figures 1 to 3 , Figure 1 This is a structural diagram of the sensor communication circuit in the wireless sensing contact lens provided in this application embodiment. Figure 2 This is a structural diagram of the magnetic flux enhancement circuit in the wireless sensing contact lens provided in this application embodiment. Figure 3 This is a cross-sectional structural diagram of a wireless sensing contact lens provided in an embodiment of this application. The embodiment of this application provides a wireless sensing contact lens including a contact lens substrate 10, a sensing communication line 20, and a magnetic flux enhancement line 30. The contact lens substrate 10 in this application has a central optical region, an inner surface, and an outer surface. The central optical region is used to provide a light path for the pupil, the inner surface is the surface that contacts the eyeball, and the outer surface is disposed opposite to the inner surface. The sensing communication line 20 is made of a conductive material and is disposed on the outer surface, surrounding the central optical region to leave a light-transmitting hole for the central optical region. The magnetic flux enhancement line 30 is made of a magnetically conductive material and is disposed on the inner surface, connecting end-to-end around the central optical region to leave a light-transmitting hole for the central optical region. In this application, a sensing communication line 20 is provided on the outer surface and a magnetic flux enhancement line 30 is provided on the inner surface. When the sensing communication line 20 transmits energy and data with an external reading and writing device through magnetic coupling, the magnetic flux enhancement line 30 attracts and concentrates magnetic lines of force, so that the magnetic lines of force pass through the sensing communication line 20 more effectively, thereby improving the coupling coefficient of the magnetic lines of force and improving the efficiency of energy and data transmission.

[0027] In some embodiments, the material of the contact lens substrate 10 may be a hydrogel or silicone hydrogel contact lens material, used to correct vision and provide a basis for wearing. Specifically, in the embodiments of this application, the material of the contact lens substrate 10 is a hydrophilic poly(hydroxyethyl methacrylate) hydrogel.

[0028] It can be understood that the core role of the magnetic flux enhancement circuit 30 is to enhance the magnetic flux density, which is similar to forming a "magnetic flux concentrator" under the sensing communication circuit 20. When an alternating magnetic field passes through, the magnetic flux enhancement circuit 30 with high magnetic permeability can attract and concentrate magnetic lines of force, making them pass through the sensing communication circuit 20 above more effectively, thereby improving the coupling coefficient (k) and overall efficiency. The larger the area (volume) of the magnetic flux enhancement circuit 30, the more obvious the effect of enhancing the magnetic flux it can provide. Specifically, with the center of the central optical area as the center, the diameter range of the magnetic flux enhancement circuit 30 is d mm, which satisfies: 4≤d≤7. Further, the inner diameter of the magnetic flux enhancement circuit 30 must be strictly avoided from the central optical area of the lens to ensure that the wearer's vision is not blocked and disturbed. The central optical area usually needs to remain completely transparent. Taking a standard contact lens (total diameter about 14.0 mm, optical area diameter about 8.0 mm) as an example, the area where the magnetic flux enhancement circuit 30 is located is a circular ring, and the optimal value of the circular ring is that the outer diameter is 14 mm and the inner diameter is 8 mm. In addition, within the circular ring area, the magnetic flux enhancement circuit 30 can be any shape or pattern, which will enhance the effect of the magnetic flux, and this enhancement effect is positively correlated with the area (volume) of the magnetic flux enhancement circuit 30.

[0029] In some embodiments, the magnetic flux enhancement circuit 30 can be a pattern made of a magnetic conductive ink or other non-conductive functional ink, used to enhance the magnetic signal coupling efficiency of the sensing communication circuit 20, provide identification function or achieve other auxiliary functions. The magnetic conductive material in this application includes neodymium iron boron magnetic conductive ink, which includes neodymium iron boron powder of the magnetic conductive functional phase and resin of the bonding phase, wherein the mass ratio of neodymium iron boron powder in the magnetic conductive material is 40% ~ 70%, and the application selects 40%, 60%, and 70% for experimental comparison, as shown in Table 1: Table 1

[0030] It can be seen that the content of neodymium iron boron powder in the neodymium iron boron magnetic conductive ink is 60% (preferred value): this ratio achieves the best balance between magnetic performance and printing suitability. It can form a high solid content, high performance film layer, while maintaining the rheological properties suitable for rubber head transfer (such as appropriate thixotropy, i.e. shear thinning), ensuring high precision and high yield of the pattern, which is the key to realizing mass production.

[0031] In some embodiments, the mass ratio of neodymium, iron and boron in the neodymium iron boron powder can be selected in the range of: neodymium 12% ~ 15%; boron: 5% ~ 7%; iron 78% ~ 83%.

[0032] In some embodiments, the sensing communication line 20 can be a conductive ink (such as a conductive silver paste ink) coil, electrode or circuit structure for realizing physiological signal sensing, wireless energy receiving or data communication functions. In this application, the sensing communication line 20 is in a spiral shape, and the design goal is to obtain as high an inductance value L and a quality factor Q as possible in a limited small area. The characterization formula of the sensing communication line 20 includes: ; wherein, is the vacuum permeability, ; is the number of turns of the coil; is the average diameter of the coil; is the filling factor related to the shape of the coil; is the inductance.

[0033] It can be understood that increasing the number of turns N can significantly increase the inductance L. In a fixed area, the thinner the line width and the smaller the spacing, the more turns can be accommodated.

[0034] In some embodiments, the center distance between the coil layers is equal to the sum of the line width and the line spacing, and the center distance between the coil layers is a μm, which satisfies: 50≤a≤100. A smaller spacing can accommodate more turns in the same area, so the inductance L is slightly higher. However, due to the slight increase in inter-turn capacitance and the slight decrease in resistance, the quality factor Q is reduced.

[0035] In some embodiments, for the line width of the coil layer, the thicker the line width, the smaller the resistance, and the greater the current that can be carried, which is beneficial to reduce power consumption and improve power transmission capability. The thinner the line width, the better the flexibility and the stronger the bending fatigue resistance. The line width of the coil is b μm, and 10≤b≤50. In this application, coils with line widths of 10 μm, 25 μm and 50 μm are respectively selected for direct current resistance, current carrying capacity and bending durability experiments, and the experimental results are shown in Table 2: Table 2

[0036] It can be seen that the 10 μm line width has very high requirements on the printing process, is prone to breakpoints, uneven thickness, results in low yield, and has too large resistance, which is not practical. Although the 50 μm line width has good electrical performance, it sharply reduces the number of turns that can be wound in a fixed area, resulting in a significant decrease in inductance L, and the increased rigidity may affect comfort. The 25 μm line width achieves a perfect balance between resistance, mechanical flexibility, and most importantly, printing suitability. It can ensure continuous, uniform and high-yield lines under the rubber head transfer printing process, while providing low enough resistance and good durability, which is the optimal choice for mass production.

[0037] In some embodiments, the present application fixes the line width to 25 pm, and the line spacing is 25 pm, 50 pm, and 75 pm, respectively, to test the performance of three coil samples (i.e., the center distance is 50 pm, 75 pm, and 100 pm, respectively) under the same outer diameter and number of turns, as shown in Table 3: Table 3

[0038] It can be seen that the center distance of 50 pm (i.e., 25 pm line width + 25 pm spacing) achieves the best balance in electrical performance and manufacturing feasibility, which is the preferred solution of the present application.

[0039] In addition, the larger space in the middle of the coil is needed to correspond to the pupil of the wearer in the central optical area of the contact lens. This area must maintain very high light transmittance to ensure that vision is not disturbed. The cornea itself has no blood vessels and relies on oxygen in the tear fluid and air to be metabolized through the central area of the lens. Excessive coverage area will hinder oxygen transmission, causing corneal hypoxia, edema, and other discomfort or damage. In the process of inductive coupling signal transmission, the central space allows more magnetic lines to pass from the inside of the lens to form a complete magnetic circuit, thereby enhancing the mutual inductance with the external reader coil.

[0040] In some embodiments, the present application embeds the sensing communication circuit 20 and the magnetic flux enhancement circuit 30 on the outer surface and the inner surface of the contact lens substrate 10, respectively, by using a transfer printing technology. Specifically, a first silicone glue head with a micro-bump array is used to dip conductive silver paste ink and accurately transfer it to the inner surface of the concave mold to form a series of planar spiral coil patterns as the sensing communication circuit 20. Another second glue head is used to dip the conductive ink mixed with neodymium iron boron and transfer it to the outer surface of the convex mold to form a disc pattern matching the size of the upper layer coil as the magnetic flux enhancement circuit 30.

[0041] The present application provides a single-layer functional contact lens, and tests the efficiency of energy and data transmission in the intraocular pressure detection environment, and compares it with the wireless sensing contact lens provided by the embodiments of the present application. Please refer to Figure 6 , Figure 6 The signal strength comparison chart of the single-layer functional contact lens and the wireless sensing contact lens provided by the embodiments of the present application shows that compared with the single-layer functional contact lens, the magnetic flux enhancement circuit 30 inside the wireless sensing contact lens provided by the embodiments of the present application can enhance the magnetic coupling between the external reading and writing device and the sensing communication circuit 20 on the lens, improve the efficiency of energy transmission and data transmission, and thus realize more accurate and stable intraocular pressure monitoring.

[0042] Understandably, the wireless sensing contact lens provided by the embodiments of the present application includes a contact lens base 10, a sensing communication line 20 and a magnetic flux enhancement line 30; the contact lens base 10 in the present application has a central optical area, an inner surface and an outer surface, the central optical area is used to leave a light path for the pupil, the inner surface is a surface in contact with the eyeball, and the outer surface is arranged opposite to the inner surface; the sensing communication line 20 is made of conductive material, is arranged on the outer surface and surrounds the central optical area to leave a light transmission hole for the central optical area; the magnetic flux enhancement line 30 is made of magnetic conductive material, is arranged on the inner surface and is connected at the head and tail to surround the central optical area to leave a light transmission hole for the central optical area. In the present application, the sensing communication line 20 is arranged on the outer surface, and the magnetic flux enhancement line 30 is arranged on the inner surface. When the sensing communication line 20 and the external reading and writing equipment perform energy and data transmission through magnetic coupling, the magnetic flux enhancement line 30 attracts and concentrates the magnetic force lines, so that the magnetic force lines pass through the sensing communication line 20 more effectively, thereby improving the coupling coefficient of the magnetic force lines and improving the energy and data transmission efficiency.

[0043] Correspondingly, the embodiments of the present application also provide a preparation method of the wireless sensing contact lens, which is used for preparing the wireless sensing contact lens provided by the embodiments of the present application. Please refer to Figure 4 and Figure 5 , Figure 4 The flowchart of the preparation method of the wireless sensing contact lens provided by the embodiments of the present application is shown in the figure, Figure 5 The preparation method of the wireless sensing contact lens provided by the embodiments of the present application is specifically implemented through steps 100 to 800: Step 100: configure a concave mold and a convex mold.

[0044] Step 200: arrange conductive material on the inner surface of the forming cavity of the concave mold to form the sensing communication line 20.

[0045] In some embodiments, a first glue head is configured, and the conductive material, i.e., conductive silver paste ink, is quantitatively transferred to the inner surface of the forming cavity of the concave mold through the first glue head to form the sensing communication line 20.

[0046] Step 300: arrange magnetic conductive material on the outer surface of the forming end of the convex mold to form the magnetic flux enhancement line 30.

[0047] In some embodiments, a second glue head is configured, and the magnetic conductive material, i.e., neodymium iron boron magnetic conductive ink, is quantitatively transferred to the outer surface of the forming end of the convex mold through the second glue head to form the magnetic flux enhancement line 30.

[0048] Step 400: inject liquid hydrogel prepolymers into the forming cavity of the concave mold.

[0049] In some embodiments, the hydrophilic polyhydroxyethyl methacrylate hydrogel pre-polymer is injected into the concave mold, and the injection amount directly determines the center thickness of the lens after curing, which is the most critical parameter affecting the oxygen permeability, mechanical strength and wearing comfort of the lens. The optional range value is: 8.0 mg - 15.0 mg, and the present application selects 8 mg, 10.5 mg, 12 mg and 15 mg for experimental comparison, as shown in Table 4: Table 4

[0050] Since the center thickness of 150 μm after combination is a key node, it can easily meet the oxygen permeability required for daily wear. Therefore, the injection amount of 10.5 mg exactly reaches the ideal thickness. The lens with too low injection amount has insufficient mechanical strength although the oxygen permeability is extremely high; and too high injection amount leads to too thick lens, which reduces the oxygen permeability and makes the wearing comfortable feeling poor.

[0051] It can be understood that the hydrophilic polyhydroxyethyl methacrylate is a common contact lens hydrogel monomer material, which mainly functions to form the main structure of the lens. The hydrophilic polyhydroxyethyl methacrylate hydrogel after curing constitutes the bulk layer of the contact lens, which is responsible for providing the basic shape, refractive power (if needed to correct vision) and mechanical support of the lens. The hydrophilic polyhydroxyethyl methacrylate hydrogel is a contact lens material that has been clinically verified for a long time, safe and reliable. The hydrogel network formed after the pre-polymer is cured can absorb a large amount of water, making the lens soft, elastic and having good oxygen permeability, thereby ensuring the health of the cornea and the wearing comfort.

[0052] Step 500: align the molding end of the convex mold with the molding cavity of the concave mold.

[0053] Step 600: press the convex mold and the concave mold together, so that the hydrogel pre-polymer is filled between the convex mold and the concave mold, and the sensing communication line 20 and the magnetic flux enhancement line 30 are respectively embedded in the hydrogel pre-polymer.

[0054] Step 700: irradiate the closed mold with ultraviolet light or heat, so that the hydrogel pre-polymer is cured, and the sensing communication line 20 and the magnetic flux enhancement line 30 are integrated into one, to obtain a solid contact lens precursor.

[0055] In some embodiments, the closed mold is placed under ultraviolet light for irradiation for 60 seconds, so that the hydrogel pre-polymer is completely cured to form a contact lens layer. After the mold is opened, a three-layer integrated solid contact lens precursor is obtained.

[0056] Step 800: immerse the solid contact lens precursor in physiological saline for hydration and swelling, to obtain a wireless sensing contact lens.

[0057] It can be understood that the preparation method of the wireless sensing contact lens provided by the embodiments of the application comprises configuring a concave mold and a convex mold; disposing a conductive material on the inner surface of the forming cavity of the concave mold to form a sensing communication circuit 20; disposing a magnetic material on the outer surface of the forming end of the convex mold to form a magnetic flux enhancement circuit 30; injecting a liquid hydrogel prepolymer into the forming cavity of the concave mold; aligning the forming end of the convex mold with the forming cavity of the concave mold; pressing the convex mold and the concave mold to make the hydrogel prepolymer fill between the convex mold and the concave mold, and the sensing communication circuit 20 and the magnetic flux enhancement circuit 30 are embedded in the hydrogel prepolymer respectively; irradiating the closed mold with ultraviolet light or heating to make the hydrogel prepolymer solidify and combine the sensing communication circuit 20 and the magnetic flux enhancement circuit 30 into one, to obtain a solid contact lens precursor; immersing the solid contact lens precursor in physiological saline to hydrate and expand, to obtain a wireless sensing contact lens. The sensing communication circuit 20 and the magnetic flux enhancement circuit 30 are printed on different molds respectively, then a liquid matrix is injected into the molds, and the sensing communication circuit 20 and the magnetic flux enhancement circuit 30 are solidified and embedded on the outer surface and the inner surface of the contact lens substrate 10 after the mold is closed, so that the sensing communication circuit 20 and the magnetic flux enhancement circuit 30 are formed at the same time with the contact lens substrate 10 through embedded transfer printing, the interface bonding force is enhanced, the sensing communication circuit 20 is not easy to fall off, the stability and reliability of the sensing communication circuit 20 during work are improved, the influence on magnetic coupling is reduced, and the energy and data transmission efficiency is ensured.

[0058] The above describes the wireless sensing contact lens and the preparation method thereof provided by the embodiments of the application in detail, and the principles and implementation manners of the application are described by applying specific examples; the above description of the embodiments is only used to help understand the method and the core idea thereof; meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the application, and the above description of the specification should not be understood as a limitation of the application.

Claims

1. A wireless sensing contact lens, characterized in that, The application relates to a wireless sensing contact lens, comprising: a contact lens base (10) having a central optical area, an inner surface for contacting eyeballs and an outer surface arranged opposite to the inner surface; a sensing communication line (20) arranged on the outer surface and surrounding the central optical area; the material of the sensing communication line (20) comprises conductive material; a magnetic flux enhancement line (30) arranged on the inner surface and connected at the head and tail of the central optical area; the material of the magnetic flux enhancement line (30) comprises magnetic conductive material.

2. The wireless sensing contact lens of claim 1, wherein, The diameter of the magnetic flux enhancement line (30) ranges from d mm, and 4<=d<=7.

3. The wireless sensing contact lens of claim 1, wherein, The magnetic conductive material comprises neodymium iron boron powder and resin.

4. The wireless sensing contact lens of claim 3, wherein, The mass ratio of the neodymium iron boron powder in the magnetic conductive material is 40%-70%.

5. The wireless sensing contact lens of claim 4, wherein, The mass ratio of the neodymium iron boron powder in the magnetic conductive material is 60%.

6. The wireless sensing contact lens of claim 1, wherein, The sensing communication line (20) is in a spiral shape, and the sensing communication line (20) comprises a characteristic formula. ； wherein, is the vacuum permeability; is the number of turns of the coil; is the average diameter of the coil; is the fill factor related to the shape of the coil; is the inductance.

7. The wireless sensing contact lens of claim 6, wherein, The wire width of the coil is b mu m, and 10<=b<=50; The center distance between the coil layers is a mu m, and 50<=a<=100.

8. The wireless sensing contact lens of claim 7, wherein, a=75。 9. The wireless sensing contact lens of claim 7, wherein, b=25。 10. A method for manufacturing a wireless sensing contact lens, characterized in that, The application further relates to a preparation method of the wireless sensing contact lens, and the preparation method comprises the following steps: arranging a concave mold and a convex mold; arranging the conductive material on the inner surface of the forming cavity of the concave mold to form the sensing communication line (20); arranging the magnetic conductive material on the outer surface of the forming end of the convex mold to form the magnetic flux enhancement line (30); injecting liquid hydrogel prepolymer into the forming cavity of the concave mold; aligning the forming end of the convex mold with the forming cavity of the concave mold; pressing the convex mold and the concave mold so that the hydrogel prepolymer is filled between the convex mold and the concave mold, and the sensing communication line (20) and the magnetic flux enhancement line (30) are embedded in the hydrogel prepolymer respectively; irradiating the combined mold with ultraviolet light or heating so that the hydrogel prepolymer is solidified and the sensing communication line (20) and the magnetic flux enhancement line (30) are combined into one, and a solid contact lens precursor is obtained; immersing the solid contact lens precursor in physiological saline to perform hydration expansion, and obtaining the wireless sensing contact lens.

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