Layered bandage with step-by-step impact force decomposition function and preparation method of layered bandage

Abstract

The invention discloses a layered bandage capable of decomposing impact force step by step, and relates to the field of medical textile materials. A layered bandage capable of decomposing impact force step by step comprises grey cloth woven by at least two warp yarn layers, the grey cloth adopts a plain weave or a deformation weave of the plain weave, each warp yarn layer is loaded by an independent weaving shaft, the tensity of each warp yarn layer is different, each warp yarn layer adopts a split-shaft weaving process, and the warp yarn layers are arranged in the split-shaft weaving process. Wherein the first warp yarn layer adopts loose weaving, and the second warp yarn layer adopts tight weaving. The layered bandage provided by the invention can meet the requirements of gradually consuming energy through layered fracture in an impact event, providing differentiated staged pressure according to the difference of human body parts, and giving consideration to support rigidity and operation convenience.

Description

Technical Field

[0001] The present invention relates to the field of medical textile materials, and particularly to a layered bandage with a gradually decomposing impact force and a preparation method thereof. Background Art

[0002] Medical bandages are one of the common medical devices, used for the protection and fixation of wounds or after surgeries. Existing applied bandages are mainly divided into three types: ①. Non-elastic bandaging products: Ordinary bandages usually have differences in strength, thickness, and softness, and functions such as waterproofing, flame retardancy, and sterilization can be imparted to ordinary bandages through post-processing. However, ordinary bandages will fail as a whole when the external force exceeds the strength threshold; ②. Elastic bandages: By adding elastic filaments or changing the yarn structure, elastic bandages can have longitudinal, transverse, or four-way elasticity. However, the rigidity of elastic bandages is reduced and the stretching range is uncontrollable, making it difficult for medical staff to perform pre-stretching operations, and elastic bandages cannot achieve graded fracture; ③. Functional bandages: By adding functional materials such as carbon fiber and glass fiber, functions such as far-infrared and ultraviolet protection can be achieved, but the problem of force decomposition cannot be solved.

[0003] Therefore, existing medical bandages cannot meet the requirements of gradually consuming energy through layered fracture in impact events, providing differential stage pressures according to the differences in human body parts, and taking into account the support rigidity and operation convenience. Summary of the Invention

[0004] In order to solve the above problems, the present application provides a layered bandage with a gradually decomposing impact force and a preparation method thereof.

[0005] The technical solution adopted by the layered bandage with a gradually decomposing impact force and the preparation method provided by the present application is as follows: A layered bandage with a gradually decomposing impact force, the layered bandage includes a fabric woven from at least two warp yarn layers, the fabric adopts a plain weave or a deformed plain weave, and the deformed plain weave is specifically one of a warp rib weave, a weft rib weave, or a basket weave. Each warp yarn layer is carried by an independent loom shaft, the tension of each warp yarn layer is different, each warp yarn layer adopts a split shaft weaving process, and the first warp yarn layer adopts a loose weaving method, and the second warp yarn layer adopts a tight weaving method.

[0006] By adopting the above technical solutions, by selecting the warp layers carried by independent weaving bearings, the tension and breaking strength thresholds of each warp layer are different; combining slack weaving and tight weaving enables different warp layers to obtain different pre-stretching effects; adopting plain weave or its deformed weave enables the adjustment of the final thickness and softness of the bandage product, making the thickness of the bandage uniform, soft and breathable, and forming a stepped strength distribution through the selection of the tissue structure to ensure that each warp group has an increasing breaking strength threshold.

[0007] Thus, through the design of the breaking strength thresholds of the layered bandage, when encountering an impact event, the first warp layer breaks first, releasing part of the energy, and the second layer undertakes the remaining load, realizing the gradual release of energy and the maintenance of dynamic support, which can effectively reduce the harm of the impact to the human body, and ensure the stability and comfort during the use of the bandage, without being too tight to affect blood circulation when providing effective support, taking into account both the support rigidity and the operation convenience.

[0008] Optionally, multiple warp layers are composed of yarns of different materials, and the yarns are selected from one or more of polyester, cotton, and aramid.

[0009] Optionally, multiple warp layers are composed of yarns of the same material, and in this case, there are differences in the thickness of the yarns selected for the warp layers.

[0010] By adopting the above technical solutions, through the material differences and thickness differences of the yarns, different physical properties and different breaking strength thresholds of different warp layers are realized, the layered fracture mechanism is realized, and at the same time, the strength and softness characteristics of the bandage are adjusted.

[0011] Optionally, the greige cloth includes two warp layers carried by independent weaving bearings. The first warp layer is made of 21s pure cotton yarn, and the second warp layer is made of 16s polyester-cotton blended yarn. The blending ratio in the polyester-cotton blended yarn is 65% polyester: 35% cotton.

[0012] By adopting the above technical solutions, there are differences in the pre-stretching rates of the first layer composed of 21s pure cotton yarn and the second layer composed of 16s polyester-cotton blended yarn, and the support force retention rate of the second layer after the first layer breaks is detected to reach 85%. Therefore, when using the bandage, medical staff do not need to precisely pre-stretch, which is convenient for operation, and the bandage has a good support retention effect.

[0013] Optionally, the tissue structure form of the greige cloth is selected as warp rib weave, and both the number of warp yarns in the tissue cycle and the number of warping shafts are even numbers.

[0014] By adopting the above technical solutions, when warp rib weave is selected, requirements are put forward for the number of warp yarns in the tissue cycle and the number of warping shafts. At this time, the divided warping shafts can be fully matched with the tissue diagram, optimizing the force distribution of each warp layer and realizing the best strength combination.

[0015] Optionally, weak elastic yarns are used in at least one warp layer to provide tensile buffering for the final layer of the layered bandage.

[0016] By adopting the above technical solution, when subjected to external force impact, the tensile buffering performance provided by the weak elastic yarns is utilized to further enhance the energy absorption effect, prevent the impact force from directly transmitting to the human body, and reduce the damage caused by the impact.

[0017] Optionally, the layered bandage is coated with medical-grade silicone on the surface of the fabric formed by at least two warp layers.

[0018] By adopting the above technical solution, medical-grade silicone has high compatibility with human tissues. At the same time, the adhesion of silicone can be used to achieve the fitting and fixation of the bandage and the human body part, reducing the adhesion and friction to the wound surface.

[0019] Optionally, the medical-grade silicone selected is medical-grade silicone chemically modified with chitosan, and the specific raw materials include the following: 40 - 60 parts of PDMS silicone rubber; 3 - 7 parts of γ-aminopropyltriethoxysilane; 2 - 4 parts of glutaraldehyde; 6 - 10 parts of chitosan.

[0020] By adopting the above technical solution, a silane coupling agent is used to perform surface treatment on PDMS silicone rubber to introduce active groups on the surface. Chitosan is used to modify the silicone, and glutaraldehyde is used as a cross-linking agent to improve the cross-linking strength between chitosan and silicone, so that the antibacterial property and stability of the modified medical-grade silicone are improved.

[0021] The present application provides a preparation method of a layered bandage capable of gradually decomposing impact force, including the following steps: S1: Select yarns and perform pre-treatment on the yarns; S2. Determine the tissue structure of the bandage and design the machine parameters such as warp and weft densities; S3. Beam weaving. According to the designed number of layered levels, divide the warp yarns onto multiple weaving beams for weaving to obtain multiple warp layers. Arrange the multiple weaving beams at different parts of the loom in an up-and-down arrangement or a longitudinal arrangement, and use the method of loose weaving or tight weaving to obtain the fabric; S4. Perform pre-shrinking treatment and flatness after-treatment on the woven fabric; S5. Coat medical-grade silicone on the surface of the fabric after after-treatment, and cut it into appropriate small strips to obtain a layered bandage capable of gradually decomposing impact force.

[0022] By adopting the above technical solution, a layered medical bandage is obtained through the selection of differential warp yarns and sectional warping technology, which can break gradually to release energy when impacted, and at the same time provide phased compressive support force, and is applicable to scenarios such as sports protection, trauma fixation, and postoperative rehabilitation.

[0023] In summary, the present application has the following beneficial effects: By selecting the warp yarn layers carried by independent weaving shafts, the tension and breaking strength thresholds of each warp yarn layer are different; combining slack weaving and tight weaving enables different warp yarn layers to obtain different pre-stretching effects; adopting plain weave or its deformed weave enables the final thickness and softness of the bandage product to be adjusted, making the thickness of the bandage uniform, soft and breathable, and forming a stepped strength distribution through the selection of the tissue structure to ensure that each warp yarn group has an increasing breaking strength threshold.

[0024] Thus, through the design of the breaking strength threshold of the layered bandage, when encountering an impact event, the first warp yarn layer breaks first to release part of the energy, and the second layer undertakes the remaining load, realizing the gradual release of energy and the maintenance of dynamic support, which can effectively reduce the harm of the impact to the human body, and ensure the stability and comfort during the use of the bandage, and will not be too tight to affect blood circulation when providing effective support, taking into account both the support rigidity and the operation convenience. Specific embodiments

[0025] The present application will be further described in detail below in conjunction with Examples 1-5 and Comparative Examples 1-2. Examples

[0026] Example 1 In this example, a layered bandage with the ability to gradually decompose the impact force is prepared by the following method: S1. Select yarns. In this example, the layered bandage includes a grey fabric woven with two warp yarn layers, and each warp yarn layer is carried by an independent weaving shaft. Among them, the first warp yarn layer (Weaving Shaft A) selects 21-count polyester yarn with a pre-stretching rate of 10%; the second warp yarn layer (Weaving Shaft B) selects 10-count full-cotton yarn with a pre-stretching rate of 7%. Pretreat the yarns. For colored fabrics, sectional warping can be used; for dyed fabrics, batch warping can be selected.

[0027] S2. Determine the tissue structure of the bandage: The bandage selects plain weave, and the warp density is designed to be 50 threads / cm; the weft density is 30 threads / cm.

[0028] S3. Split-axis weaving: The 21-count polyester yarn is divided onto the A warp beam to obtain the first warp layer, and the 10-count fully cotton yarn is divided onto the B warp beam to obtain the second warp layer. The A warp beam and the B warp beam are arranged vertically at different positions on the loom, and the grey fabric is formed by the two warp layers. During weaving, the A warp beam uses loose weaving (the warp feeding is such that no surface loops are formed), and the B warp beam uses tight weaving (the warp yarn is not broken and can be produced smoothly). A yarn with a certain weak elasticity is also used on the B warp beam to provide the final layer tensile buffer.

[0029] S4. The grey fabric obtained by weaving is subjected to pre-shrinking treatment and flatness after-treatment. After steam pre-shrinking treatment, the shrinkage rate is controlled at 5%.

[0030] S5. Medical-grade silicone is coated on the surface of the grey fabric after after-treatment, and it is cut into 10-cm-wide roll strips to obtain a layered bandage with a gradually decomposed impact force.

[0031] The obtained layered bandage is tested, and the test items are the breaking strength of the warp beam and the sub-layer support force of the impact test.

[0032] Regarding the breaking strength, according to the standard of GB / T 3923.1-2013 "Textiles - Tensile properties of fabrics - Part 1: Determination of breaking force and elongation at break (strip method)", the test is carried out using a tensile testing machine according to the strip method to obtain the results.

[0033] Regarding the impact test, in the test, the prepared layered bandage is placed on the sensor, and a 0.55-kg hammer head is released from a height using a drop hammer impact setting. After the sample is impacted, the first layer of the bandage breaks, and the force sensor amplifies the data signal of each layer's support force through a charge amplifier, and the support force data is collected through a digital oscilloscope.

[0034] The breaking strength of the A warp beam is 110 N, and the breaking strength of the B warp beam is 160 N. The impact test shows that the retention rate of the sub-layer support force reaches 78% after the first layer breaks.

[0035] Example 2 In this example, a layered bandage with a gradually decomposed impact force is prepared by the following method: S1. Select yarns. In this example, the layered bandage includes a grey fabric woven from two warp layers, and each warp layer is carried by an independent warp beam. Among them, the first warp layer (A warp beam) selects 21-count fully cotton yarn with a pre-tensile rate of 3%; the second warp layer (B warp beam) selects 16-count fully cotton yarn with a pre-tensile rate of 7%. The yarns are pre-treated. For colored fabrics, sectional warping can be used; for dyed fabrics, batch warping can be selected.

[0036] S2. Determine the fabric structure of the bandage: The bandage uses a 2 / 2 weft rib structure, with a designed warp density of 60 threads / cm and a weft density of 40 threads / cm.

[0037] S3. Weave on separate shafts. Divide the 21s all-cotton yarn onto loom shaft A to obtain the first warp layer, and divide the 16s all-cotton yarn onto loom shaft B to obtain the second warp layer. Arrange loom shafts A and B vertically at different positions on the loom, and form a grey fabric through the two warp layers. During weaving, loom shaft A uses loose weaving (the warp feeding is such that no surface loops are formed), and loom shaft B uses tight weaving (the warp yarns are not broken and the production can proceed smoothly). A yarn with a certain weak elasticity is also used on loom shaft A to provide the final layer tensile buffer.

[0038] S4. Perform pre-shrinking treatment and flatness after-treatment on the woven grey fabric. After steam pre-shrinking treatment, the shrinkage rate is controlled at 5%.

[0039] S5. Coat the surface of the after-treated grey fabric with medical-grade silicone, and cut it into 10-cm-wide rolled strips to obtain a layered bandage with a gradually decomposed impact force.

[0040] Test the obtained layered bandage. The breaking strength of loom shaft A is 100 N, and the breaking strength of loom shaft B is 140 N. The impact experiment shows that the retention rate of the support force of the secondary layer after the first layer breaks reaches 82%.

[0041] Example 3 This example prepares a layered bandage with a gradually decomposed impact force, which is obtained through the following method: S1. Select yarns. In this example, the layered bandage includes a grey fabric woven from two warp layers, and each warp layer is carried by an independent loom shaft. Among them, the first warp layer (loom shaft A) selects 21s all-cotton yarn with a pre-stretching rate of 3%; the second warp layer (loom shaft B) selects 16s polyester-cotton blended yarn, and the blending ratio in the polyester-cotton blended yarn is specifically 65% polyester: 35% cotton, with a pre-stretching rate of 0%. Pretreat the yarns. For coloured fabrics, sectional warping can be used; for dyed fabrics, batch warping can be selected.

[0042] S2. Determine the fabric structure of the bandage: The bandage uses a 2 / 2 warp rib structure, the number of warp yarns in the tissue cycle and the number of loom shafts are both even, with a designed warp density of 60 threads / cm and a weft density of 40 threads / cm.

[0043] S3. Split-axis weaving: The 21s all-cotton yarn is distributed to the A warp beam to obtain the first warp layer, and the 16s polyester-cotton blended yarn is distributed to the B warp beam to obtain the second warp layer. The A warp beam and the B warp beam are arranged vertically at different positions of the loom, and the grey cloth is formed by the two warp layers. During weaving, the A warp beam adopts loose weaving (the warp feeding is controlled so that no surface loops are formed), and the B warp beam adopts tight weaving (the warp yarn is not broken and can be smoothly produced). Yarns with a certain weak elasticity are also used on the A warp beam and the B warp beam to provide the final layer stretching buffer.

[0044] S4. The grey cloth obtained by weaving is subjected to pre-shrinking treatment and flatness finishing. After steam pre-shrinking treatment, the shrinkage rate is controlled at 5%.

[0045] S5. Medical-grade silicone is coated on the surface of the grey cloth after finishing, and it is cut into 10-cm-wide roll strips to obtain a layered bandage with the ability to gradually decompose the impact force.

[0046] The obtained layered bandage is tested. The breaking strength of the A warp beam is 120 N, and the breaking strength of the B warp beam is 180 N. The impact experiment shows that the support force retention rate of the secondary layer reaches 85% after the first layer breaks.

[0047] During the use of the layered bandages prepared in Examples 1-3, when encountering an impact event, they can achieve layered fracture, convert the impact energy into multi-stage dissipation, and at the same time, the secondary layer can still stably provide a supporting effect after the first layer breaks. Moreover, during the operation, the layered bandage can adapt to the irregular body surface morphology without precise pre-stretching.

[0048] Example 4 The difference between this example and Example 3 is that in step S5, the medical-grade silicone coated is different. The medical-grade silicone in this example is a medical-grade silicone chemically modified with chitosan, and the specific raw materials include: 40 parts of PDMS silicone rubber; 3 parts of γ-aminopropyltriethoxysilane; 2 parts of glutaraldehyde; 6 parts of chitosan, and the chitosan selected is water-soluble chitosan with a molecular weight of 20 kD.

[0049] The medical-grade silicone chemically modified with chitosan is prepared through the following steps: After treating PDMS silicone rubber with ozone, it is then soaked in acetone containing 5% γ-aminopropyltrimethoxysilane, and after oscillating and reacting at room temperature for 20 min, it is washed with acetone and dried with nitrogen; it is soaked in an aqueous solution containing 5% glutaraldehyde and reacted at room temperature for 1 h; after washing with water, it is soaked in an aqueous solution containing 10 mg / mL chitosan and reacted at room temperature for 40 min, and then washed with water; the medical-grade silicone chemically modified with chitosan is obtained.

[0050] The hierarchical bandage of this embodiment was tested. The breaking strength of the A warp beam was 120 N, and the breaking strength of the B warp beam was 180 N. The impact experiment showed that the retention rate of the secondary layer support force reached 85% after the first layer broke. After the medical-grade silicone was chemically modified with chitosan, antibacterial properties were obtained.

[0051] Example 5 The difference between this embodiment and Example 3 is that: in step S5, there are differences in the coated medical-grade silicone. The medical-grade silicone used in this embodiment is the medical-grade silicone chemically modified with chitosan, and the specific raw materials include the following: 60 parts of PDMS silicone rubber; 7 parts of γ-aminopropyltriethoxysilane; 4 parts of glutaraldehyde; 10 parts of chitosan, and the chitosan selected is water-soluble chitosan with a molecular weight of 20 kD.

[0052] The medical-grade silicone chemically modified with chitosan is prepared through the following steps: After treating PDMS silicone rubber with ozone, it is then soaked in acetone containing 5% γ-aminopropyltrimethoxysilane, and after reacting with shaking at room temperature for 30 min, it is washed with acetone and dried with nitrogen; it is soaked in an aqueous solution containing 5% glutaraldehyde and reacted at room temperature for 1 h; after washing with water, it is soaked in an aqueous solution containing 10 mg / mL chitosan and reacted at room temperature for 50 min, and then washed with water; the medical-grade silicone chemically modified with chitosan is obtained.

[0053] The hierarchical bandage of this embodiment was tested. The breaking strength of the A warp beam was 120 N, and the breaking strength of the B warp beam was 180 N. The impact experiment showed that the retention rate of the secondary layer support force reached 85% after the first layer broke. After the medical-grade silicone was chemically modified with chitosan, antibacterial properties were obtained.

[0054] Comparative Example Comparative Example 1 The difference between this comparative example and Example 1 is only that: in this comparative example, the two warp layers are not carried by independent warp beams, and during the weaving process, the two warp layers are woven on the same warp beam to form a greige fabric.

[0055] The hierarchical bandage prepared in this comparative example was tested. Since the two warp layers are arranged on the same warp beam, when impacted, the two warp layers affect each other and cannot achieve layered rupture, and the use of the bandage is unstable.

[0056] Comparative Example 2 The difference between this comparative example and Example 1 is only that: in this comparative example, both of the two warp layers are woven in a slack manner.

[0057] The hierarchical bandage obtained in this comparative example was tested. The breaking strength of the A warp beam was 110 N, and the breaking strength of the B warp beam was 140 N. The impact experiment showed that the retention rate of the secondary layer support force after the first layer broke reached 60%. However, in the comparative example, the same method of loose weaving was used for both warp layers, and the pre-stretching effects of the two warp layers were not very different. Therefore, during use, medical staff need to perform precise pre-stretching to adapt to the irregular body surface morphology of the human body.

[0058] This specific implementation manner is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications without creative contributions to this specific implementation manner as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A layered bandage with a gradually decomposed impact force, characterized in that: The laminated bandage comprises at least two greige fabrics woven from warp yarn layers. The greige fabrics adopt plain weave or a modified structure of plain weave. The modified structure of plain weave is specifically one of warp rib weave, weft rib weave or basket weave. Each warp yarn layer is carried by an independent loom shaft, and the tension of each warp yarn layer is different. Each warp yarn layer adopts a split-shaft weaving process, in which the first warp yarn layer adopts a loose weaving method and the second warp yarn layer adopts a tight weaving method.

2. The layered bandage with gradually decomposed impact force according to claim 1, characterized in that: The multiple warp yarn layers are composed of yarns of different materials, and the yarns are selected from one or more of polyester, cotton and aramid.

3. A layered bandage with a gradually decomposed impact force according to claim 1, characterized in that: The multiple warp yarn layers are composed of yarns of the same material. At this time, the thickness of the yarns selected for the warp yarn layers is different.

4. The layered bandage with the ability to gradually decompose the impact force according to claim 1, characterized in that: The greige fabric comprises two warp yarn layers carried by independent loom shafts. The first warp yarn layer selects 21s pure cotton yarn, and the second warp yarn layer selects 16s polyester-cotton blended yarn. The blending ratio in the polyester-cotton blended yarn is 65% polyester: 35% cotton.

5. The hierarchical bandage with gradually decomposed impact force according to claim 1, characterized in that: The organizational structure form of the greige fabric selects warp rib weave, and both the number of warp yarns in the weave cycle and the number of loom shafts are even numbers.

6. A layered bandage with a gradually decomposed impact force according to claim 1, characterized in that: At least one warp yarn layer adopts a low-elastic yarn to provide tensile buffering for the final layer of the laminated bandage.

7. A hierarchical bandage with gradually decomposed impact force according to claim 1, characterized in that: The laminated bandage is coated with medical-grade silica gel on the surface of the greige fabric composed of at least two warp yarn layers.

8. A layered bandage with a gradually decomposed impact force according to claim 7, characterized in that: The medical-grade silica gel selects medical-grade silica gel chemically modified by chitosan, and specifically includes the following raw materials: 40-60 parts of PDMS silicone rubber; 3-7 parts of γ-aminopropyltriethoxysilane; 2-4 parts of glutaraldehyde; 6-10 parts of chitosan.

9. A preparation method of a layered bandage with a step-by-step impact force decomposition according to any one of claims 1-8, characterized in that, It includes the following steps: S1: Select yarns and perform pretreatment on the yarns; S2. Determine the organizational structure of the bandage and design the machine parameters such as warp and weft densities; S3. Split-shaft weaving. According to the designed number of laminated layers, divide the warp yarns onto multiple loom shafts for weaving to obtain multiple warp yarn layers. Arrange the multiple loom shafts in an up-and-down or longitudinal arrangement at different parts of the loom, and adopt a loose weaving or tight weaving method to obtain the greige fabric; S4. Perform pre-shrinking treatment and flatness after-treatment on the woven greige fabric; S5. Coat medical-grade silica gel on the surface of the post-treated greige fabric and cut it into appropriate small strips to obtain a laminated bandage with the ability to gradually decompose impact force.