A brace for lower eyelid surgery and its preparation and use method

Abstract

The present invention relates to a brace for lower eyelid surgery, and its preparation and use methods. The brace comprises a protective plate and a pressure-reducing pad. Both the protective plate and the pressure-reducing pad are crescent-shaped sheets, and the pressure-reducing pad is positioned on the side of the protective plate that contacts the lower eyelid. The brace has a protective plate whose hardness can change with time and temperature, exhibiting excellent plasticity, tear resistance, water resistance, and dimensional stability. It also has a fragrant aroma, improving user experience.

Description

Technical Field

[0001] The present invention relates to the field of medical rehabilitation nursing equipment, and more particularly to a brace for postoperative lower eyelid surgery, and a preparation method and a use method thereof. Background Art

[0002] As we age, our skin gradually ages and becomes loose. The eyelid skin is one of the thinnest parts of the human body, and the formation and gradual worsening of eye bags are important signs of eyelid skin aging. The increasing living standards have led to a growing pursuit of a better image, and more and more people are choosing to undergo lower eyelid bag removal surgery. Periocular congestion and edema and lower eyelid ectropion are common in the short term after lower eyelid bag removal surgery. These postoperative reactions will prolong the recovery period and may affect the effectiveness of the surgery. Therefore, postoperative rehabilitation care has become an indispensable step to promote postoperative recovery and enhance the effectiveness of the surgery. Wearing a lower eyelid brace is a commonly used postoperative care method for the lower eyelid. By applying pressure to the lower eyelid, it can effectively reduce swelling and prevent complications such as eyelid bulbar separation, lower eyelid ectropion, and retraction.

[0003] At present, the lower eyelid brace commonly used in clinical practice is composed of a guard plate and an elastic band connecting the guard plate. CN204671374U proposes a brace for lower eyelid surgery, whose guard plate is made of a low-temperature thermoplastic plate. The currently commonly used low-temperature thermoplastic plate is mainly made of cross-linked polycaprolactone. This material has strong plasticity. After being soaked in hot water for a certain period of time, it becomes soft and can be shaped at will. After the temperature is lowered, it gradually hardens and has a shape memory function. However, this material has obvious disadvantages: 1) It is expensive; 2) It has a plastic smell. Since the brace after lower eyelid surgery is close to the nasal cavity when used, long-term wearing will cause discomfort to the patient; 3) A cross-linking process is used during production, which requires one-time shaping. The residual scraps cannot be recycled and can only be discarded, which is not environmentally friendly; 4) The appearance is relatively simple, and the surface is rough and matte, which is not beautiful enough.

[0004] Therefore, a brace for lower eyelid surgery that is odorless, low-cost, environmentally friendly, and highly plastic is highly needed. Summary of the Invention

[0005] In view of the problems of the existing brace after lower eyelid surgery in the above-mentioned prior art, one of the objects of the present invention is to provide a brace after lower eyelid surgery. The production cost of the brace after lower eyelid surgery is lower than that of cross-linked polycaprolactone, the hardness of the guard plate of the brace can change with time and temperature, and the brace has excellent plasticity, tear resistance, water resistance and dimensional stability. At the same time, it has an aromatic smell, which can improve the user experience.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A brace for postoperative lower eyelid surgery comprises a guard plate and a pressure relief pad, both of which are crescent-shaped sheet structures, and the pressure relief pad is placed on the contact side of the guard plate and the lower eyelid.

[0008] In the above technical solution, there is no fixed connection between the guard plate and the pressure relief pad, and they can just be fitted together when in use.

[0009] In the above technical solution, the thickness of the guard plate is 0.2-5 mm, preferably 0.5-2 mm.

[0010] In the above technical solution, the thickness of the pressure relief pad is 0.1-2 mm, preferably 0.5-1 mm.

[0011] In the above technical solution, the protective plate and / or pressure relief pad may have a porous structure, or may not have a porous structure, preferably having a porous structure; the porous structure is distributed throughout the surface of the brace after lower eyelid surgery, with the spacing between the holes being 1-10 mm, preferably 2-4 mm; and the pore diameter of the pore structure is 1-10 mm, preferably 1-3 mm. If both the protective plate and the pressure relief pad have a porous structure, the pore structures of both are preferably connected to each other to ensure good air permeability of the brace after lower eyelid surgery.

[0012] In the above technical solution, the pressure relief pad is made of at least one of rubber, sponge, thermoplastic elastomer, cloth, paper, gel, leather and plasticine.

[0013] In the above technical solution, the protective plate is made of a copolyester material, and the copolyester material includes copolyester X and copolyester Y; wherein the copolyester X includes aliphatic diacid and / or its derivative segments, aromatic diacid and / or its derivative segments, and diol segments; the diol segments include at least one diol segment with a cyclic structure segment and at least one aliphatic diol segment; wherein the molar percentage of the aromatic diacid and / or its derivative segments in the total diacid and / or its derivative segments is 15-60%;

[0014] The copolyester Y comprises aliphatic diacid and / or its derivative segments, aromatic diacid and / or its derivative segments, and at least one aliphatic diol segment; the molar percentage of the aromatic diacid and / or its derivative segments relative to the total diacid and / or its derivative segments is 50-95%. The aromatic diacid content of the copolyesters X and Y of the present invention within the above range can improve the rigidity of the copolyesters to varying degrees.

[0015] In the above technical solution, based on 100 parts by weight of the total copolyester, the copolyester X is 50 to 99 parts, preferably 55 to 80 parts. When the content of the copolyester X of the present invention is within the above range, the temperature required for triggering softening of the material can be reduced to varying degrees, thereby increasing the hardness and wear resistance of the material.

[0016] The content of the copolyester Y is 1 to 50 parts, preferably 20 to 45 parts. When the content of the copolyester Y of the present invention is within the above range, the curing time of the copolyester composition material can be reduced to varying degrees.

[0017] In the above technical solution, the molar percentage of the aromatic diacid and / or its derivative segments in the copolyester X to the total diacid and / or its derivative segments is 25-60%, more preferably 30-60%.

[0018] Preferably, the molar percentage of the cyclic diol segments in the copolyester X is 1-60%, preferably 5-25%. The introduction of the cyclic diol segments can increase the rigidity of the copolyester, lower the temperature required to trigger softening, and increase the hardness and wear resistance of the material.

[0019] Preferably, the molar ratio of the total diacid segments to the total diol segments in the copolyester X is (0.8-1):1, preferably (0.9-1):1.

[0020] Preferably, the molar percentage of the aromatic diacid and / or its derivative segments in the copolyester Y to the total diacid and / or its derivative segments is 60-85%.

[0021] Preferably, the molar ratio of the total diacid segments to the total diol segments in the copolyester Y is (0.8-1):1, preferably (0.9-1):1.

[0022] In the above technical solution, the copolyester X and the copolyester Y are each independently at least one of a random copolymer, an alternating copolymer, a block copolymer and a graft copolymer, preferably a random copolymer and / or a block copolymer.

[0023] In the above technical solution, the aliphatic diacid and / or its derivative is selected from at least one of 1,4-butanediol and / or its derivative, and 1,6-hexanediol and / or its derivative.

[0024] The aromatic diacid and / or its derivatives are selected from terephthalic acid and / or its derivatives.

[0025] The diol with a cyclic structure is selected from at least one of 1,4-cyclohexanedimethanol, isosorbide, and 2,2,4,4-tetramethyl-1,3-cyclobutanediol.

[0026] The aliphatic diol is selected from at least one of 1,3-propylene glycol, 1,4-butanediol, and 1,6-hexanediol.

[0027] The introduction of the cyclic diol into the copolyester X alone can reduce the thickness of the copolyester crystals, thereby lowering the melting point of the copolyester and increasing its ease of use. Furthermore, the introduction of the cyclic diol can reduce the crystallization rate of the copolyester, resulting in an increase in the curing time of the copolyester material.

[0028] Compared to copolyester X alone, copolyester Y has a shorter cure time, but a higher softening temperature and poorer hardness and wear resistance. Therefore, a combination of copolyester X and copolyester Y is used to compensate for the deficiencies of either copolyester X or Y alone. By adjusting the ratio of the two, the combined copolyester achieves the desired softening temperature, hardness, wear resistance, and cure time.

[0029] In the above technical solution, the aliphatic diol segment in the copolyester X is different from the aliphatic diol segment in the copolyester Y; preferably,

[0030] The aliphatic diol chain segment in the copolyester X is derived from 1,4-butanediol; and the aliphatic diol chain segment in the copolyester Y is derived from 1,3-propylene glycol and / or 1,6-hexanediol.

[0031] In the above technical solution, based on 100 parts by total weight of copolyester X and copolyester Y, 0.5 to 10 parts, preferably 1.5 to 8 parts, of fragrance are further included.

[0032] The fragrance is selected from at least one of fruit essence and floral essence; the fruit essence includes but is not limited to strawberry, banana, sweet orange, pineapple, grape and other fragrances; the floral essence includes but is not limited to rose, jasmine, tuberose, lily of the valley, magnolia and other fragrances.

[0033] In the above technical solution, based on 100 parts by total weight of copolyester X and copolyester Y, 1-15 parts of a lubricant are further included, and the lubricant is selected from at least one of stearic acid, butyl stearate, oleamide, ethylene bisstearamide and low-density polyethylene.

[0034] The method for preparing the copolyester material of the present invention comprises the steps of mixing components including the copolyester X and the copolyester Y and then melt-blending them.

[0035] In the above technical solution, the mixing is carried out under stirring conditions, and the stirring rate is 20-150r / min.

[0036] In the above technical solution, the stirring time is 5-15 minutes.

[0037] In the above technical solution, the melt blending is carried out by extrusion granulation through a twin-screw extruder; preferably, the temperature of the extrusion granulation is 110 to 260°C, more preferably 160 to 220°C.

[0038] The second object of the present invention is to provide a method for preparing the brace after lower eyelid surgery, which has low production cost, is easy to use, and provides good user experience.

[0039] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0040] A method for preparing a brace for lower eyelid surgery comprises sequentially extruding and molding a copolyester material to obtain a protective plate; preferably, the extrusion temperature is 90-230°C, preferably 110-170°C; and the molding method is preferably injection molding and / or compression molding. The equipment used is also conventional extrusion, injection molding, and compression molding equipment.

[0041] The shape of the pressure relief pad material can be any, preferably rectangular, square, circular, etc., and can be cut according to the shape of the guard plate when used. The pressure relief pad material can be a material with holes or a material without holes, which can be punched together with the guard plate when used.

[0042] A third object of the present invention is to provide a method for using a brace after lower eyelid surgery, comprising heating the guard plate to fully soften it, then rapidly cooling it to a temperature acceptable to the human body, fixing a pressure relief pad on the contact side of the guard plate with the lower eyelid, and then placing it on the lower eyelid surgery site, adjusting the shape of the guard plate according to the patient's lower eyelid morphology and wound characteristics, and waiting for the guard plate to harden after the adjustment is completed.

[0043] Preferably, the unpacked lower eyelid surgery brace guard plate is heated to fully soften it, and the heating methods include but are not limited to soaking it in hot water, especially boiling water, heating in a microwave oven, oven, hot plate, etc.; then it is quickly cooled to a temperature acceptable to the human body, and the cooling methods include but are not limited to soaking it in cold water, ice water or liquid nitrogen, contacting it with ice cubes or ice bags, and placing it in a refrigerator refrigerator or freezer or freezer; then it is wiped clean, and the pressure relief pad is fixed to the contact side of the guard plate with the lower eyelid, and then placed on the lower eyelid surgery site, and the shape of the guard plate is adjusted according to the patient's lower eyelid morphology and wound characteristics, and appropriate pressure is applied to the lower eyelid surgery site, and then it is fixed to the eye area with medical tape; after the adjustment is completed, wait for the guard plate to harden.

[0044] Beneficial effects of the present invention:

[0045] 1. Improve transparency and beautiful appearance;

[0046] 2. Moderate hardness and aromatic smell, good user experience;

[0047] 3. The processing process does not require cross-linking, and the scraps can be recycled and reused, which is beneficial to environmental protection;

[0048] 4. Easy to use;

[0049] 5. Lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 Schematic diagram of the brace structure after lower eyelid surgery of the present invention.

[0051] Reference numerals: 1: guard plate, 2: pressure relief pad, 3: ventilation hole. The figure shows a brace for lower eyelid surgery, comprising a guard plate and a pressure relief pad, both of which are crescent-shaped sheet structures. DETAILED DESCRIPTION

[0052] The present invention will be described in detail below with reference to specific embodiments. It is necessary to point out that the following embodiments are only used to further illustrate the present invention and are not to be construed as limiting the scope of protection of the present invention. Non-essential improvements and adjustments made by those skilled in the art to the present invention based on the contents of the present invention still fall within the scope of protection of the present invention.

[0053] It should also be noted that the various specific technical features described in the following specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0054] In addition, the various embodiments of the present invention may be arbitrarily combined as long as they do not violate the concept of the present invention. The technical solutions thus formed belong to part of the original disclosure of this specification and also fall within the scope of protection of the present invention.

[0055] Sources of reagents: All reagents used in the present invention are commercially available.

[0056] In the following examples and comparative examples, the weight-average molecular weight of the polymers was measured by gel permeation chromatography (GPC) using tetrahydrofuran (THF) as solvent on a Waters-208 instrument (with a Waters 2410RI detector, a flow rate of 1.5 mL / min, and 30° C.), calibrated with styrene standards.

[0057] The composition of the polyester composition is determined by the feeding of raw materials; wherein, the types of reaction raw materials can be adjusted accordingly according to the composition and molecular weight of the target product, and the molecular weight of the product and the content of each repeating unit in the product can be controlled by adjusting the feeding amount and feeding ratio.

[0058] Example 1

[0059] A postoperative brace for lower eyelid surgery includes a protective plate and a pressure-reducing pad. Both the protective plate and the pressure-reducing pad are crescent-shaped sheets, and the pressure-reducing pad is placed on the side of the protective plate that contacts the lower eyelid. The pressure-reducing pad is 0.5 mm thick, and the protective plate is 3 mm thick. The protective plate and / or the pressure-reducing pad have a perforated structure with a 2 mm spacing between the holes; the perforations have a diameter of 2 mm. The pressure-reducing pad is made of rubber.

[0060] Preparation of the protective plate: Under stirring conditions (stirring rate of 30 rpm for 10 minutes), 7 kg of terephthalic acid-butylene glycol-succinic acid-1,4-cyclohexanedimethanol copolyester X (weight average molecular weight of 120,000, wherein the content of terephthalic acid repeating units is 60 mol% based on the total moles of terephthalic acid and succinic acid repeating units; the content of 1,4-cyclohexanedimethanol repeating units is 25 mol% based on the total moles of butylene glycol and 1,4-cyclohexanedimethanol repeating units) particles, 2.5 kg of terephthalic acid-propylene glycol-succinic acid copolyester Y (weight average molecular weight of 100,000, wherein the content of terephthalic acid repeating units is 60 mol% based on the total moles of terephthalic acid and succinic acid repeating units) particles, 0.2 kg of jasmine essence, and 0.3 kg of low-density polyethylene were mixed. Wherein, the molar ratio of the total diacid segment to the total diol segment in the copolyester X is 0.95:1, and the molar ratio of the total diacid segment to the total diol segment in the copolyester Y is 0.95:1. The obtained mixture is extruded and granulated through a twin-screw extruder, the screw speed is controlled to 10 rpm, the torque is 20 N*m, and the temperature of each section from the feed port to the extrusion port in the twin-screw extruder is 150°C, 160°C, 170°C, 170°C, 170°C, and 170°C, respectively, to obtain copolyester material A1. After the copolyester material A1 is melted, it is pressed into a crescent-shaped sheet structure of appropriate size at 170°C and 1000 MPa, and waited for about 1 hour for it to completely harden to obtain the lower eyelid surgery support plate B1.

[0061] Example 2

[0062] A postoperative brace for lower eyelid surgery includes a protective plate and a pressure-reducing pad. Both the protective plate and the pressure-reducing pad are crescent-shaped sheets, and the pressure-reducing pad is placed on the side of the protective plate that contacts the lower eyelid. The pressure-reducing pad is 0.8 mm thick, and the protective plate is 2 mm thick. The protective plate and / or the pressure-reducing pad have a perforated structure with a 2.5 mm spacing between the holes. The perforations have a diameter of 2 mm. The pressure-reducing pad is made of sponge.

[0063] Preparation of the protective plate: Under stirring conditions (stirring rate is 30 rpm, time is 10 minutes), 6.5 kg of terephthalic acid-butylene glycol-adipic acid-isosorbide copolyester X (weight average molecular weight is 130,000, wherein, based on the total moles of terephthalic acid and adipic acid repeating units, the content of terephthalic acid repeating units is 55 mol%; based on the total moles of butylene glycol and isosorbide repeating units, the content of isosorbide repeating units is 20 mol%) particles, 3 kg of terephthalic acid-hexanediol-succinic acid copolyester Y (weight average molecular weight is 100,000, wherein, based on the total moles of terephthalic acid and succinic acid repeating units, the content of terephthalic acid repeating units is 60 mol%) particles, 0.2 kg of jasmine essence and 0.3 kg of low-density polyethylene were mixed. Wherein, the molar ratio of the total diacid segment to the total diol segment in the copolyester X is 1:1, and the molar ratio of the total diacid segment to the total diol segment in the copolyester Y is 1:1. The obtained mixture is extruded and granulated through a twin-screw extruder, the screw speed is controlled to 10 rpm, the torque is 20 N*m, and the temperatures of each section from the feed port to the extrusion port in the twin-screw extruder are 150°C, 160°C, 170°C, 170°C, 170°C, and 170°C, respectively, to obtain copolyester material A2. After the copolyester material A2 is melted, it is pressed into a crescent-shaped sheet structure of appropriate size at 170°C and 1000 MPa, and waited for about 1 hour for it to completely harden, to obtain the lower eyelid surgery support plate B2.

[0064] Example 3

[0065] A postoperative brace for lower eyelid surgery includes a protective plate and a pressure-reducing pad. Both the protective plate and the pressure-reducing pad are crescent-shaped sheets, and the pressure-reducing pad is placed on the side of the protective plate that contacts the lower eyelid. The pressure-reducing pad is 0.6 mm thick, and the protective plate is 3 mm thick. The protective plate and / or the pressure-reducing pad have a perforated structure with a 2 mm spacing between the holes. The perforations have a diameter of 2.5 mm. The pressure-reducing pad is made of leather.

[0066] Preparation of protective plate: Under stirring conditions (stirring rate is 30 rpm, time is 10 min), 6.5 kg of terephthalic acid-butylene glycol-succinic acid-2,2,4,4-tetramethyl-1,3-cyclobutanediol copolyester X (weight average molecular weight is 150,000, wherein the content of terephthalic acid repeating units is 30 mol% based on the total molar number of terephthalic acid and succinic acid repeating units; based on the total molar number of butylene glycol and 2,2,4,4-tetramethyl-1,3-cyclobutanediol copolyester X) were added. The present invention also prepares a mixture of 1,2-diol copolyester X (copolyester X) and 0.3-diol copolyester Y (copolyester Y), wherein the molar ratio of the total diacid segments to the total diol segments in the copolyester X is 0.9:1, and the molar ratio of the total diacid segments to the total diol segments in the copolyester Y is 0.9:1. The resulting mixture was extruded and granulated through a twin-screw extruder at a controlled screw speed of 10 rpm and a torque of 20 Nm. The temperatures in the sections from the feed inlet to the extrusion outlet of the twin-screw extruder were adjusted to 150°C, 160°C, 170°C, 170°C, 170°C, and 170°C, respectively, to produce copolyester material A3. After melting copolyester material A3, pressurized at 170°C and 1000 MPa into a crescent-shaped sheet structure of appropriate size, and allowed to fully harden for approximately one hour to produce the lower eyelid surgery brace plate B3.

[0067] Example 4

[0068] A postoperative brace for lower eyelid surgery includes a protective plate and a pressure-reducing pad. Both the protective plate and the pressure-reducing pad are crescent-shaped sheets, and the pressure-reducing pad is placed on the side of the protective plate that contacts the lower eyelid. The pressure-reducing pad is 0.8 mm thick, and the protective plate is 2 mm thick. The protective plate and / or the pressure-reducing pad have a perforated structure, with the perforations spaced 2.5 mm apart. The perforations have a diameter of 2.5 mm. The pressure-reducing pad is made of plasticine.

[0069] Preparation of the protective plate: Under stirring conditions (stirring rate of 30 rpm for 10 minutes), 7 kg of terephthalic acid-butylene glycol-succinic acid-1,4-cyclohexanedimethanol copolyester X (weight average molecular weight of 120,000, wherein the content of terephthalic acid repeating units is 60 mol% based on the total moles of terephthalic acid and succinic acid repeating units; the content of 1,4-cyclohexanedimethanol repeating units is 25 mol% based on the total moles of butylene glycol and 1,4-cyclohexanedimethanol repeating units) particles, 2.5 kg of terephthalic acid-propylene glycol-succinic acid copolyester Y (weight average molecular weight of 110,000, wherein the content of terephthalic acid repeating units is 80 mol% based on the total moles of terephthalic acid and succinic acid repeating units) particles, 0.2 kg of jasmine essence, and 0.3 kg of low-density polyethylene were mixed. Wherein, the molar ratio of the total diacid segment to the total diol segment in the copolyester X is 0.95:1, and the molar ratio of the total diacid segment to the total diol segment in the copolyester Y is 1:1. The obtained mixture is extruded and granulated through a twin-screw extruder, the screw speed is controlled to 10 rpm, the torque is 20 N*m, and the temperature of each section from the feed port to the extrusion port in the twin-screw extruder is 150°C, 160°C, 170°C, 170°C, 170°C, and 170°C, respectively, to obtain copolyester material A4. After the copolyester material A4 is melted, it is pressed into a crescent-shaped sheet structure of appropriate size at 170°C and 1000 MPa, and waited for about 1 hour for it to completely harden, to obtain the lower eyelid postoperative brace guard B4.

[0070] Example 5

[0071] A postoperative brace for lower eyelid surgery includes a protective plate and a pressure-reducing pad. Both the protective plate and the pressure-reducing pad are crescent-shaped sheets, and the pressure-reducing pad is placed on the side of the protective plate that contacts the lower eyelid. The pressure-reducing pad is 0.8 mm thick, and the protective plate is 2 mm thick. The protective plate and / or the pressure-reducing pad have a perforated structure with a 2.5 mm spacing between the holes. The perforations have a diameter of 2 mm. The pressure-reducing pad is made of sponge.

[0072] Preparation of protective plate: Under stirring conditions (stirring rate is 30 rpm, time is 10 min), 7 kg of terephthalic acid-butylene glycol-succinic acid-2,2,4,4-tetramethyl-1,3-cyclobutanediol copolyester X (weight average molecular weight is 150,000, wherein the content of terephthalic acid repeating unit is 60 mol% based on the total molar number of terephthalic acid and succinic acid repeating units; based on the total molar number of butylene glycol and 2,2,4,4-tetramethyl-1,3-cyclobutanediol copolyester X) was added. The present invention also provides a method for preparing a mixture of 2,2,4,4-tetramethyl-1,3-cyclobutanediol (copolyester X) particles (containing 10 mol% of 2,2,4,4-tetramethyl-1,3-cyclobutanediol repeating units, based on the total molar number of terephthalic acid and succinic acid repeating units), 2.5 kg of terephthalic acid-propylene glycol-succinic acid copolyester Y (weight-average molecular weight of 100,000, containing 60 mol% of terephthalic acid repeating units, based on the total molar number of terephthalic acid and succinic acid repeating units), 0.2 kg of jasmine essence, and 0.3 kg of low-density polyethylene. The molar ratio of the total diacid segments to the total diol segments in the copolyester X is 1:1, and the molar ratio of the total diacid segments to the total diol segments in the copolyester Y is 0.9:1. The resulting mixture was extruded and granulated through a twin-screw extruder at a controlled screw speed of 10 rpm and a torque of 20 Nm. The temperatures in the sections from the feed inlet to the extrusion outlet of the twin-screw extruder were adjusted to 150°C, 160°C, 170°C, 170°C, 170°C, and 170°C, respectively, to produce copolyester material A5. After melting copolyester material A5, pressurize it at 170°C and 1000 MPa to form a crescent-shaped sheet structure of appropriate size. After allowing it to completely harden for approximately one hour, the lower eyelid surgery brace plate B5 was obtained.

[0073] Example 6

[0074] A postoperative brace for lower eyelid surgery includes a protective plate and a pressure-reducing pad. Both the protective plate and the pressure-reducing pad are crescent-shaped sheets, and the pressure-reducing pad is placed on the side of the protective plate that contacts the lower eyelid. The pressure-reducing pad is 0.8 mm thick, and the protective plate is 2 mm thick. The protective plate and / or the pressure-reducing pad have a perforated structure with a 2.5 mm spacing between the holes. The perforations have a diameter of 2 mm. The pressure-reducing pad is made of sponge.

[0075] Under stirring conditions (stirring rate of 30 rpm, time for 10 min), 7 kg of terephthalic acid-butylene glycol-succinic acid-isosorbide copolyester X (weight average molecular weight of 130,000, wherein, based on the total molar number of terephthalic acid and succinic acid repeating units, the content of terephthalic acid repeating units is 60 mol%; based on the total molar number of butylene glycol and isosorbide repeating units, the content of isosorbide repeating units is 5 mol%) particles, 2.5 kg of terephthalic acid-propylene glycol-succinic acid copolyester Y (weight average molecular weight of 100,000, wherein, based on the total molar number of terephthalic acid and succinic acid repeating units, the content of terephthalic acid repeating units is 60 mol%) particles, 0.2 kg of jasmine essence and 0.3 kg of low-density polyethylene were mixed. Wherein, the molar ratio of the total diacid segment to the total diol segment in the copolyester X is 0.95:1, and the molar ratio of the total diacid segment to the total diol segment in the copolyester Y is 0.9:1. The obtained mixture is extruded and granulated through a twin-screw extruder, the screw speed is controlled to 10 rpm, the torque is 20 N*m, and the temperature of each section from the feed port to the extrusion port in the twin-screw extruder is 150°C, 160°C, 170°C, 170°C, 170°C, and 170°C, respectively, to obtain copolyester material A6. After the copolyester material A6 is melted, it is pressed into a crescent-shaped sheet structure of appropriate size at 170°C and 1000 MPa, and waited for about 1 hour for it to completely harden to obtain the lower eyelid surgery support plate B6.

[0076] Comparative Example 1

[0077] 9.5 kg of terephthalate-butylene glycol-succinate-1,4-cyclohexanedimethanol copolyester X (weight-average molecular weight 120,000, terephthalate repeating unit content 60 mol% based on the total moles of terephthalic acid and succinate repeating units; 1,4-cyclohexanedimethanol repeating unit content 25 mol% based on the total moles of butanediol and 1,4-cyclohexanedimethanol repeating units) particles, 0.2 kg of jasmine essence, and 0.3 kg of low-density polyethylene were mixed under stirring at 30 rpm for 10 minutes. The molar ratio of the total diacid segments to the total diol segments in copolyester X was 1:1. The resulting mixture was extruded and granulated through a twin-screw extruder at a controlled screw speed of 10 rpm and a torque of 20 Nm. The temperatures in the sections from the feed inlet to the extrusion outlet of the twin-screw extruder were adjusted to 150°C, 160°C, 170°C, 170°C, 170°C, and 170°C, respectively, to produce copolyester material A7. After melting copolyester material A7, pressurize it at 170°C and 1000 MPa to form a crescent-shaped sheet structure of appropriate size. Allow it to completely harden for approximately one hour to obtain the lower eyelid surgery brace plate B7.

[0078] Comparative Example 2

[0079] 9.5 kg of terephthalic acid-butylene glycol-adipate-isosorbide copolyester X (weight-average molecular weight 130,000, 55 mol% terephthalic acid repeating units, based on the total moles of terephthalic acid and adipic acid repeating units; 20 mol% isosorbide repeating units, based on the total moles of butylene glycol and isosorbide repeating units) particles, 0.2 kg jasmine essence, and 0.3 kg low-density polyethylene were mixed under stirring (30 rpm for 10 minutes). The molar ratio of the total diacid segments to the total diol segments in copolyester X was 0.9:1. The resulting mixture was extruded and granulated through a twin-screw extruder at a controlled screw speed of 10 rpm and a torque of 20 Nm. The temperatures in the sections from the feed inlet to the extrusion outlet of the twin-screw extruder were adjusted to 150°C, 160°C, 170°C, 170°C, 170°C, and 170°C, respectively, to produce copolyester material A8. After melting copolyester material A8, the material was pressed into a crescent-shaped sheet structure of appropriate size at 170°C and 1000 MPa. The sheet was then allowed to completely harden for approximately one hour to produce the lower eyelid surgery brace plate B8.

[0080] Comparative Example 3

[0081] 6.5 kg of terephthalic acid-butylene glycol-succinic acid copolyester Y (weight-average molecular weight of 100,000, with a terephthalic acid repeating unit content of 25 mol % based on the total molar number of terephthalic acid and succinic acid repeating units) particles, 3 kg of terephthalic acid-butylene glycol-adipic acid copolyester (weight-average molecular weight of 100,000, with a terephthalic acid repeating unit content of 65 mol % based on the total molar number of terephthalic acid and adipic acid repeating units) particles, 0.2 kg of jasmine essence, and 0.3 kg of low-density polyethylene were mixed under stirring (stirring at 30 rpm for 10 minutes). The molar ratio of total diacid segments to total diol segments in the copolyester Y was 0.95:1. The resulting mixture was extruded and granulated through a twin-screw extruder at a controlled screw speed of 10 rpm and a torque of 20 Nm. The temperatures in the sections from the feed inlet to the extrusion outlet of the twin-screw extruder were adjusted to 150°C, 160°C, 170°C, 170°C, 170°C, and 170°C, respectively, to produce copolyester material A9. After melting copolyester material A9, the material was pressed into a crescent-shaped sheet structure of appropriate size at 170°C and 1000 MPa. The sheet was then allowed to completely harden for approximately one hour to produce the lower eyelid surgery brace plate B9.

[0082] Test Example 1 Softening Temperature Test

[0083] The brace plates obtained in Examples 1-6 and Comparative Example 3 were placed in hot water at different temperatures, and the temperatures required to trigger the softening of the brace plates were recorded. The results are shown in Table 1.

[0084] Table 1

[0085]

[0086] It can be seen that the softening temperatures required for the brace plates B1-B6 obtained in Examples 1-6 are all lower than those for the brace plate B9 obtained in Comparative Example 3, with the maximum softening temperature reaching 20°C. Lowering the softening trigger temperature for the brace plates after lower eyelid surgery can significantly increase the convenience of brace use after lower eyelid surgery.

[0087] Test Example 2 Shore A Hardness Test

[0088] Copolyesters A1-A8 obtained in Examples 1-6 and Comparative Examples 1-2 were melted, treated at 170°C and 1000 MPa for 5 minutes, and pressed into sheets 4 mm thick and 7 cm long. The hot sheets were removed and quenched using a cold iron block that had been kept at room temperature for 1 minute, with time zero recorded. The quenched sheets were then tested for Shore A hardness over time (measured using a Drick Shore A handheld durometer, with the results taken after 3 seconds). The results are shown in Table 2 below.

[0089] Table 2 Shore A hardness test

[0090]

[0091]

[0092] The results in Table 2 above show that the copolyesters A1-A8 obtained in Examples 1-6 and Comparative Examples 1-2 all exhibited relatively low hardness at the beginning of the test (at higher temperatures), with the hardness slowly increasing over time after cooling. Compared to the copolyesters A7-A8 obtained in Comparative Examples 1-2, the copolyesters A1-A6 obtained in Examples 1-6 cured faster, reaching a Shore A hardness of 50 in approximately 4 minutes, compared to approximately 7 minutes for the copolyesters A7-A8 obtained in Comparative Examples 1-2. The copolyesters A1-A6 obtained in Examples 1-6 exhibited excellent plasticity and fixability, making them suitable for use in the preparation of braces for lower eyelid surgery.

[0093] Test Example 3 Waterproof Test

[0094] The lower eyelid postoperative brace plates B1-B6 obtained in Examples 1-6 were weighed, measured, photographed, and their appearances were observed. The plates were immersed in water at 25°C for 24 hours, then taken out and dried, and then weighed, measured, photographed, and their appearances were observed. If the appearance of the plate after immersion in water does not change compared to before immersion, it is recorded as "no change", otherwise it is recorded as "change". If the size of the plate after immersion in water changes within ±2% compared to before immersion, it is recorded as "no change", otherwise it is recorded as "change". If the weight of the plate after immersion in water changes within ±2% compared to before immersion, it is recorded as "no change", otherwise it is recorded as "change". The results are shown in Table 3.

[0095] Test Example 4: Storage Time Test

[0096] The lower eyelid postoperative brace plates B1-B6 obtained in Examples 1-6 were weighed, measured, photographed, and their appearances observed. The obtained plates were then placed in a normal pressure environment at room temperature (25°C) for 2 years, and the plates were weighed, measured, photographed, and their appearances observed. If the appearance of the plate after 2 years is unchanged from that before placement, it is recorded as "no change", otherwise it is recorded as "change". If the size of the plate after 2 years is unchanged from that before placement, it is recorded as "no change", otherwise it is recorded as "change". If the weight of the plate after 2 years is changed within ±2% from that before placement, it is recorded as "no change", otherwise it is recorded as "change". The results are shown in Table 3.

[0097] Table 3

[0098]

[0099] As can be seen from the results in Table 3 above, the brace for lower eyelid surgery provided by the present invention has good waterproofness and dimensional stability, so it does not require special packaging such as waterproofing during storage and transportation; and the shelf life is at least two years at room temperature.

[0100] The present invention has been described in detail above with reference to specific embodiments and exemplary examples. However, these descriptions should not be construed as limiting the present invention. Those skilled in the art will appreciate that various equivalent substitutions, modifications, or improvements may be made to the technical solutions and implementations of the present invention without departing from the spirit and scope of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A brace for lower eyelid surgery, comprising a guard plate and a pressure-reducing pad, both of which are crescent-shaped sheets, with the pressure-reducing pad positioned on the side of the guard plate that contacts the lower eyelid. The guard plate is made of a copolyester material, and the copolyester material comprises copolyester X and copolyester Y; The copolyester X comprises an aliphatic diacid segment, an aromatic diacid segment and a diol segment; the diol segment comprises at least one diol segment with a cyclic structure segment and at least one aliphatic diol segment, and the molar percentage of the aromatic diacid segment in the total diacid segment is 25-60%; wherein the copolyester Y comprises an aliphatic diacid segment, an aromatic diacid segment and at least one aliphatic diol segment, and the molar percentage of the aromatic diacid segment in the total diacid segments is 60-85%; The copolyester X and copolyester Y are each independently at least one of a random copolymer, an alternating copolymer, a block copolymer and a graft copolymer; The molecular weight range of the copolyester X and the copolyester Y is 20,000-200,000; Based on 100 parts by weight of the total copolyester, the copolyester X is 55 to 80 parts, and the copolyester Y is 20 to 45 parts; The molar percentage of the diol segment with a cyclic structure segment in the copolyester X is 5 to 25% of the total diol segment; The molar ratio of the total diacid segments to the total diol segments in the copolyester X is (0.9-1):1; The molar ratio of the total diacid segments to the total diol segments in the copolyester Y is (0.9-1):1; The aliphatic diacid is at least one selected from 1,4-butanedioic acid and 1,6-adipic acid; The aromatic diacid is selected from terephthalic acid; The diol with a cyclic structure is selected from at least one of 1,4-cyclohexanedimethanol, isosorbide, and 2,2,4,4-tetramethyl-1,3-cyclobutanediol; The aliphatic diol is at least one selected from 1,3-propylene glycol, 1,4-butanediol and 1,6-hexanediol; The aliphatic diol segment in the copolyester X is different from the aliphatic diol segment in the copolyester Y.

2. The brace for lower eyelid surgery according to claim 1, characterized in that: The thickness of the guard plate is 0.2-5 mm; and / or, The thickness of the pressure relief pad is 0.1-2 mm.

3. The brace for lower eyelid surgery according to claim 2, characterized in that: The thickness of the guard plate is 0.5-2 mm; and / or, The thickness of the pressure relief pad is 0.5-1 mm.

4. The brace for lower eyelid surgery according to claim 1, characterized in that: The protective plate and / or the pressure relief pad have a hole structure.

5. The brace for lower eyelid surgery according to claim 4, characterized in that: The pore structure is distributed throughout the surface of the brace after lower eyelid surgery, and the intervals between the pore structures are 1-10 mm; the pore diameter of the pore structure is 1-10 mm.

6. The brace for lower eyelid surgery according to claim 4, characterized in that: The intervals between the hole structures are 2-4 mm; and / or, The pore structure has a pore diameter of 1-3 mm.

7. The brace for lower eyelid surgery according to claim 1, characterized in that: The pressure relief pad is made of at least one of rubber, sponge, thermoplastic elastomer, cloth, paper, gel, leather and plasticine.

8. The brace for lower eyelid surgery according to claim 1, characterized in that: The copolyester X and the copolyester Y are each independently a random copolymer and / or a block copolymer; and / or the molecular weight of the copolyester X and the copolyester Y is in the range of 80,000-150,000.

9. The brace for lower eyelid surgery according to claim 1, characterized in that: The aliphatic diol chain segment in the copolyester X is derived from 1,4-butanediol; and the aliphatic diol chain segment in the copolyester Y is derived from 1,3-propylene glycol and / or 1,6-hexanediol.

10. The brace for lower eyelid surgery according to claim 1, characterized in that: Based on 100 parts by total weight of the copolyester X and the copolyester Y, 0.5 to 10 parts of fragrance are further included.

11. The brace for lower eyelid surgery according to claim 10, characterized in that: 1.5~8 parts of flavor.

12. The brace for lower eyelid surgery according to claim 1, characterized in that: The present invention further comprises 1 to 15 parts of a lubricant based on 100 parts by weight of the total weight of the copolyester X and the copolyester Y.

13. The brace for lower eyelid surgery according to claim 12, characterized in that: Based on 100 parts of the total weight of copolyester X and copolyester Y, the lubricant is 5 to 15 parts.

14. The brace for lower eyelid surgery according to claim 12, wherein: The lubricant is selected from at least one of stearic acid, butyl stearate, oleamide, ethylene bisstearamide and low-density polyethylene.

15. A method for preparing the brace for lower eyelid surgery according to any one of claims 1 to 14, comprising sequentially extruding and molding a copolyester material to obtain a protective plate.

16. The method for preparing a brace for lower eyelid surgery according to claim 15, wherein: The extrusion temperature is 90-230° C.; or / and, the molding method is injection molding and / or compression molding.

17. The method for preparing a brace for lower eyelid surgery according to claim 15, wherein: The extrusion temperature is 110-170°C.

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