Controllable elastic medical bandage substrate and its preparation method based on limit line composite technology

Abstract

This invention belongs to the field of medical materials technology, specifically a controllable elastic medical bandage substrate based on a limiting line composite process and its preparation method. The substrate includes an elastic substrate and a limiting line. The elastic substrate has a preset initial elasticity ratio. The limiting line is embedded into the elastic substrate in a directional implantation manner when the substrate is under tension. It is fixedly connected to the elastic substrate through a composite medium, forming a composite structure that limits the rebound range of the elastic substrate. This invention achieves controllable and gradeable elasticity of the bandage substrate through a dynamic pre-stretching composite process and gradient elasticity control technology.

Description

Technical Field

[0001] This invention belongs to the field of medical materials technology, and in particular to a controllable elastic medical bandage substrate based on a limit line composite process and its preparation method. Background Technology

[0002] Medical elastic bandages are commonly used clinical fixation and compression dressing materials, widely applied in orthopedic fixation, sports protection, postoperative compression, and rehabilitation physiotherapy. Existing medical elastic bandages are typically made of non-woven fabric sewn with elastic threads or a single elastic material, utilizing the material's inherent elasticity to achieve restraint and fixation. However, traditional elastic bandages have the following technical drawbacks in practical applications: First, they have a single elastic modulus, making it impossible to precisely control the local elasticity rate according to the clinical needs of different body parts. For example, the elasticity rate required for knee joint fixation is approximately 75%, while the elbow joint only requires about 30%. Bandages with a single elastic modulus cannot meet the differentiated requirements of different body parts. Second, theoretically, elastic bandages can be stretched indefinitely until they break. During use, the elasticity is uncontrolled, and excessive tightness can easily obstruct blood and lymphatic circulation, posing a safety hazard. Third, existing composite processes often use integral film coating or integral bonding to limit elasticity. While this can constrain the range of elasticity, it significantly reduces breathability, and prolonged wear can easily cause skin discomfort or even rashes. Therefore, how to achieve controllable and gradeable elasticity of bandage substrates, maintain good breathability within a limited elastic range, and meet the differentiated clinical needs of different body parts is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that the existing medical elastic bandages have a single elastic modulus, which cannot accurately control the local elasticity according to clinical needs. The unrestricted elasticity leads to obstruction of blood circulation when it is too tight, and the existing elastic restriction scheme has poor breathability.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a controllable elastic medical bandage substrate based on a limiting line composite process, comprising an elastic substrate and a limiting line. The elastic substrate has a preset initial elasticity ratio. The limiting line is embedded in the elastic substrate in a directional implantation manner when the elastic substrate is in a stretched state. It is fixedly connected to the elastic substrate through a composite medium to form a composite structure that limits the rebound range of the elastic substrate.

[0005] Furthermore, the elastic substrate is a warp-knitted spacer fabric with an initial elasticity ratio of 300% to 500%; the limiting line is a high-modulus polyester monofilament with a breaking elongation of less than 5% and a diameter of 0.05 mm to 0.2 mm; and the composite medium is a biocompatible hot melt adhesive with a melting point of 80°C to 120°C.

[0006] Furthermore, the limiting lines are arranged in parallel, intersecting, or spiral arrangements within the elastic substrate.

[0007] Furthermore, the implantation density of the limiting lines is from 5 lines / inch to 50 lines / inch, and the density of the limiting lines varies in different areas of the elastic substrate, forming a gradient elastic distribution structure.

[0008] Furthermore, different regions of the elastic substrate have different pre-stretch elastic ratios under tension, and each region is implanted with limiting lines of different densities or different arrangement angles to form a multi-gradient elastic distribution structure.

[0009] Furthermore, the present invention also provides a method for preparing a controllable elastic medical bandage substrate based on a limiting line composite process, comprising the following steps: a) stretching the elastic substrate to a predetermined elastic ratio in a tension control system; b) directionally implanting a non-stretchable limiting line using a multi-axis placement device while in a stretched state; c) fixing the limiting line inside the elastic substrate using a thermal composite process; d) releasing the stretch, cooling and shaping to form a composite substrate with a defined elastic range.

[0010] Further, in step a), the elastic substrate is stretched to a target elasticity ratio of 100% to 200%.

[0011] Furthermore, in step b), the limiting lines are implanted in a parallel, crisscross, or spiral arrangement, with an implantation density of 5 lines / inch to 50 lines / inch.

[0012] Further, in step c), the thermal bonding process is one or more combinations of hot-press bonding, ultrasonic welding, or hot melt adhesive bonding, and the thermal bonding temperature is 80°C to 120°C.

[0013] Furthermore, in step a), different regions of the elastic substrate are stretched to different elastic ratios, and in step b), limiting lines with different densities or different arrangement angles are implanted in different regions to form a multi-gradient elastic distribution structure.

[0014] The beneficial effects of this invention are as follows: By directionally implanting and fixing the elastic substrate with a non-stretchable limiting line in a pre-stretched state, the limiting line restricts the rebound range of the substrate after the stretch is released, making the final elastic ratio of the substrate precisely controllable. This avoids the problem of traditional elastic bandages being too tight and blocking blood circulation due to unrestricted elasticity. By changing the implantation density and arrangement angle of the limiting line from 5 to 50 lines / inch, different elastic rates can be achieved in different areas of the same bandage substrate, meeting the differentiated clinical needs for elastic fixation in different body parts such as the knee and elbow joints. The warp-knitted spacer fabric, as the elastic substrate, can achieve elastic restriction without overall film coating, maintaining the original pore structure of the substrate, and its breathability is not affected, making it suitable for long-term wear. The three-layer structure of elastic substrate, limiting line, and hot melt adhesive all use biocompatible materials, which are safe and non-irritating, and suitable for medical use. In the manufacturing process, the tension control system monitors and maintains the stretched state in real time, ensuring the tension stability and product consistency during the implantation of the limiting line. This manufacturing process does not require significant modification of existing textile equipment and has good process compatibility. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the bandage substrate structure of Embodiment 1 of the present invention.

[0017] Figure 2 This is a schematic diagram of the gradient elastic distribution structure of Embodiment 2 of the present invention.

[0018] Explanation of reference numerals in the attached drawings: 100. Elastic substrate; 200. Limiting line; 300. Composite medium. Detailed Implementation

[0019] The present invention will be further described in detail below through specific embodiments.

[0020] Example 1: This example provides a controllable elastic medical bandage substrate for surgical fixation based on a limiting line composite process. A warp-knitted spacer fabric blended with polyurethane and nylon is selected as the elastic substrate 100, with an initial elasticity ratio of 400%. The limiting line 200 is made of high-modulus polyester monofilament with a breaking elongation of less than 5% and a monofilament diameter of 0.1 mm. The composite medium 300 is a biocompatible hot melt adhesive with a melting point of 95°C.

[0021] During preparation, the elastic substrate 100 is installed in a tension control system and stretched longitudinally to a target elasticity ratio of 150% and maintained stably. Using a multi-axis layup device, polyester monofilaments are implanted into the elastic substrate 100 in a parallel arrangement under tension, with a monofilament spacing of 2 mm, equivalent to approximately 12.7 lines per inch. Subsequently, the elastic substrate 100 is hot-pressed using a heating device at a controlled temperature of 95°C, allowing the hot melt adhesive to melt and fix the polyester monofilaments inside the elastic substrate 100. After hot pressing, the tension is released, and the substrate is cooled and shaped, forming a permanent elastic constraint structure within the elastic substrate 100. Because the polyester monofilaments are non-stretchable, the range of the elastic substrate 100's rebound to its original state is limited, ultimately controlling the elasticity ratio precisely at approximately 80%.

[0022] The bandage substrate prepared in this embodiment is suitable for surgical fixation. Clinical tests show that, with an initial elasticity ratio of 400%, the final elasticity ratio stabilizes at 80% after implanting parallel-arranged limiting lines 200, with an elasticity fluctuation range of less than ±3%. When the bandage is used, it is restrained by the limiting lines 200 when stretched to approximately 80%, preventing further stretching and avoiding excessive tightness that could damage tissue. Simultaneously, the warp-knitted spacer structure of the substrate remains intact, maintaining good breathability.

[0023] Example 2 provides a gradient elastic medical bandage substrate for sports protection based on a limiting line composite process. The elastic substrate 100 is a warp-knitted spacer fabric blended with polyurethane and nylon, with an initial elasticity ratio of 400%. The limiting line 200 is made of high-modulus polyester monofilament with a breaking elongation of less than 5% and a monofilament diameter of 0.08 mm.

[0024] In this embodiment, different regions of the elastic substrate 100 are stretched to different elastic ratios to form a personalized elastic gradient distribution. Specifically, the elastic substrate 100 is divided into three regions: the first region is pre-stretched to 200%, the second region to 150%, and the third region to 100%. Under the stretched state of each region, polyester monofilaments are implanted using a multi-axis layup device in a 45° cross-arrangement, with implantation densities of 20 lines / inch, 15 lines / inch, and 10 lines / inch for the corresponding regions. Subsequently, the polyester monofilaments are fixed inside the elastic substrate 100 using an ultrasonic welding process, with the welding temperature controlled at 105°C. After welding, the stretching is released, and after cooling and shaping, the three regions form different final elastic ratios: approximately 40% for the first region, approximately 60% for the second region, and approximately 80% for the third region, thus forming a three-gradient distribution structure from high elasticity to low elasticity across the entire bandage substrate.

[0025] The gradient elastic bandage substrate prepared in this embodiment is suitable for sports protection applications and can be adapted to the different elasticity requirements of different parts of the joint. For example, in knee joint applications, the tighter third zone with an elasticity ratio of approximately 80% is assigned to areas requiring stronger support, such as the joint socket, while the looser first zone with an elasticity ratio of approximately 40% is assigned to areas with a large range of motion. Tests show that the pressure distribution of the gradient elastic product is more uniform, and the pressure sensation score is reduced by 42% compared to traditional single elastic products. After 50 washes, the elasticity change rate is less than 3%, demonstrating excellent durability.

Claims

1. A controllable elastic medical bandage substrate based on a limiting line composite process, characterized in that: It includes an elastic substrate (100) and a limiting line (200). The elastic substrate (100) has a preset initial elastic ratio. The limiting line (200) is embedded in the elastic substrate (100) in a directional implantation manner when the elastic substrate (100) is in a stretched state. It is fixedly connected to the elastic substrate (100) through a composite medium (300) to form a composite structure that limits the rebound range of the elastic substrate (100).

2. The controllable elastic medical bandage substrate based on a limiting line composite process according to claim 1, characterized in that: The elastic substrate (100) is a warp-knitted spacer fabric with an initial elasticity ratio of 300% to 500%; the limiting line (200) is a high-modulus polyester monofilament with a breaking elongation of less than 5% and a diameter of 0.05 mm to 0.2 mm; the composite medium (300) is a biocompatible hot melt adhesive with a melting point of 80°C to 120°C.

3. The controllable elastic medical bandage substrate based on a limiting line composite process according to claim 1, characterized in that: The limiting lines (200) are arranged in parallel, cross, or spiral within the elastic substrate (100).

4. The controllable elastic medical bandage substrate based on a limiting line composite process according to claim 1, characterized in that: The implantation density of the limiting line (200) is 5 lines / inch to 50 lines / inch. The density of the limiting line (200) in different regions of the elastic substrate (100) is different, forming a gradient elastic distribution structure.

5. The controllable elastic medical bandage substrate based on a limiting line composite process according to claim 1, characterized in that: Different regions of the elastic substrate (100) have different pre-stretch elastic ratios under tension, and each region is implanted with limiting lines (200) of different densities or different arrangement angles to form a multi-gradient elastic distribution structure.

6. A method for preparing a controllable elastic medical bandage substrate based on a limiting line composite process according to any one of claims 1 to 5, characterized in that... Includes the following steps: a) Stretch the elastic substrate (100) to a predetermined elastic ratio in a tension control system; b) Orient and implant non-stretchable limiting lines (200) in the stretched state using a multi-axis layup device; c) Fix the limiting lines (200) inside the elastic substrate (100) using a thermal bonding process; d) Release the stretching, cool and shape to form a composite substrate with a defined elastic range.

7. The preparation method according to claim 6, characterized in that: In step a), the elastic substrate (100) is stretched to a target elasticity ratio of 100% to 200%.

8. The preparation method according to claim 6, characterized in that: In step b), the limiting lines (200) are implanted in a parallel, cross, or spiral arrangement, with an implantation density of 5 lines / inch to 50 lines / inch.

9. The preparation method according to claim 6, characterized in that: In step c), the thermal bonding process is one or more combinations of hot-press bonding, ultrasonic welding, or hot melt adhesive bonding, and the thermal bonding temperature is 80°C to 120°C.

10. The preparation method according to claim 6, characterized in that: In step a), different regions of the elastic substrate (100) are stretched to different elastic ratios. In step b), limiting lines (200) with different densities or different arrangement angles are implanted in different regions to form a multi-gradient elastic distribution structure.

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