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CN-121971234-A - Medical compression non-woven cloth and preparation process thereof

CN121971234ACN 121971234 ACN121971234 ACN 121971234ACN-121971234-A

Abstract

The invention discloses medical compression non-woven cloth, which comprises a wave folding buffer void structure (the void ratio after expansion is 10% -25%), an expansion limiting elastic limiting layer, a streamline water drop-shaped taking-out end, a high-strength embedded taking-out rope (at least 3 points are fixed) and a gradient hydrophilic expansion core layer, wherein the preparation process comprises the steps of gradient hydrophilic modification, differential wave folding, taking-out rope multipoint fixation, water drop end shaping, gradient compression low-temperature heat shaping and the like. The invention realizes painless implantation, rapid hemostasis, uniform pressure distribution, smooth and safe taking out and remarkable improvement of clinical comfort.

Inventors

  • WU SIJIA
  • LING JINFENG
  • YAN XIULING
  • HUANG MEI
  • LAI CHUNMEI

Assignees

  • 北流市人民医院

Dates

Publication Date
20260505
Application Date
20260206

Claims (10)

  1. 1. The medical compression non-woven gauze is characterized by comprising a composite layer, wherein the composite layer comprises a thermal compression molding expansion limiting elastic limiting layer, a streamline water drop-shaped taking-out end, an embedded taking-out rope and a hydrophilic expansion core layer, and is folded into a compression gauze main body with a wave folding buffering gap structure; The void ratio of the wave folding buffer void structure after expansion is 10% -25%; at least 3 points are fixed between the taking-out rope and the composite layer, and the wet tensile strength is more than or equal to 50N.
  2. 2. The medical compressed nonwoven gauze according to claim 1, wherein the compressed gauze body is in the shape of an elongated cylinder with a diameter of 8-15mm and a length of 40-70mm; the curvature radius of the expanded extraction end is more than or equal to 5mm.
  3. 3. The compressed nonwoven medical gauze of claim 1, wherein said hydrophilic expanded core has a gradient of water absorption from inside to outside.
  4. 4. The medical compressed nonwoven gauze of claim 1, further comprising an expansion indicating structure that is a hematotropic indicator.
  5. 5. A process for preparing the medical compressed nonwoven gauze of any one of claims 1 to 4, comprising the steps of: S1, preparing raw materials and carrying out gradient hydrophilic modification: Cutting a non-woven fabric substrate into rectangular sheets, performing gradient hydrophilic modification treatment on the rectangular non-woven fabric, gradually reducing the concentration of an inner layer hydrophilic agent to 5-15% and the concentration of an outer layer to 1-5%, drying for later use, and superposing a plurality of non-woven fabric substrates to form a hydrophilic expansion core layer substrate; s2, hot melting treatment of the inner layer and the outer layer: s2-1, uniformly sandwiching a super absorbent polymer powder or a thin layer in the inner layer of the substrate of the hydrophilic expansion core layer to form the hydrophilic expansion core layer; s2-2, forming an expansion-limiting elastic limiting layer by hot-melting reticular medical polyurethane or silica gel on the outer layer of the substrate of the hydrophilic expansion core layer; s2-3, splitting one end of the taking-out rope into a reserved water drop-shaped taking-out end central area, encircling and fixing by adopting hot melting, combining stitching auxiliary fixing, and primarily shaping the streamline water drop-shaped taking-out end to form a composite layer; s3, manufacturing a wave folding buffering gap structure: placing the composite layer after the hot melting treatment in the step S2 in a wave die, performing longitudinal wave folding, and then performing spiral winding to naturally reserve the trough as an expanded micro buffer gap channel, and simultaneously ensuring that the taking-out end is arranged at the outer side of the winding and keeps a water drop shape to form a composite body; S4, shaping the compressed gauze main body; S4-1, placing the composite body folded in the step S3 into a cylindrical compression mold for gradient compression, so that the whole body is formed into an elongated cylinder, and a compressed gauze main body is formed; s4-2, performing low-temperature setting in a vacuum environment, and locking elasticity of a wave folding buffer gap structure, an expansion limiting elastic limiting layer, smooth shape of a streamline water drop-shaped taking-out end and embedding and fixing strength of a taking-out rope; s5, packaging and sterilizing: And (3) placing the shaped compressed gauze main body into a vacuum packaging bag singly, and sterilizing by adopting ethylene oxide or gamma rays to obtain a finished product.
  6. 6. The process for preparing medical compressed non-woven gauze according to claim 5, wherein the thermal fusion compounding temperature of the expansion limiting elastic limiting layer is 120-150 ℃, the thermal fusion fixing temperature of the taking-out rope is 130-160 ℃, and the connecting end of the taking-out rope and the taking-out end is at least 3.
  7. 7. The process for preparing medical compressed non-woven gauze according to claim 5, wherein the height difference of the wave folding peaks and valleys is 4-10mm, and the combination of 2-4 turns of spiral winding is adopted.
  8. 8. The process for preparing a medical compressed non-woven gauze according to claim 5, wherein the low temperature setting temperature is between 50 and 70 ℃ and the time is between 5 and 15 minutes.
  9. 9. The process for preparing a medical compressed nonwoven gauze according to claim 5, wherein the elastic modulus of the expansion-limiting elastic limiting layer is between 50 and 200 kP.
  10. 10. The process for preparing a medical compressed nonwoven gauze according to claim 5, wherein the pressure in the gradient compression in the step S4 is a gradual pressure application process and is between 2 and 15 MPa.

Description

Medical compression non-woven cloth and preparation process thereof Technical Field The invention belongs to the technical field of medical dressing, and particularly relates to medical compression non-woven cloth and a preparation process thereof. Background Post-obstetrical lateral incision wound hemostasis is a common clinical need. In the prior art, the traditional medical gauze is stuffed to stop bleeding, which has the problems of large volume, inconvenient operation, slow expansion, secondary pain in taking out and the like, the compressed gauze is convenient to put in, but is in a compact cylinder after expansion, so that the vaginal cavity is easy to be fully filled, the local pressure is overlarge, the burden of a patient is heavy, even the blood supply is influenced, meanwhile, the taking-out end is in a plane or corner structure, the friction resistance is high during taking-out, the taking-out rope is fixed by a single point, and the taking-out rope is easy to break or fall off during expansion blocking. The prior art does not see the scheme for simultaneously solving the whole process of painless implantation, rapid expansion hemostasis, uniform pressure distribution (avoiding overfilling) and smooth and safe extraction. Disclosure of Invention Aiming at the defects, the invention provides medical compression non-woven cloth, which comprises a composite layer, wherein the composite layer comprises a thermal compression molding expansion limiting elastic limiting layer, a streamline water drop-shaped taking-out end, an embedded taking-out rope and a hydrophilic expansion core layer, and is folded into a compression gauze main body with a wave folding buffer gap structure; The void ratio of the wave folding buffer void structure after expansion is 10% -25%; at least 3 points are fixed between the taking-out rope and the composite layer, and the wet tensile strength is more than or equal to 50N. Further, the gauze main body is in a compressed state and is in an elongated cylindrical shape, the diameter is 8-15mm, and the length is 40-70mm; the curvature radius of the expanded extraction end is more than or equal to 5mm. Further, the water absorption rate of the hydrophilic expansion core layer is gradually reduced from inside to outside to form a gradient structure. Further, the device also comprises an expansion indicating structure which is a blood color changing indicating strip. The invention also discloses a process for medical compression non-woven gauze, which comprises the following steps: S1, preparing raw materials and carrying out gradient hydrophilic modification: cutting a non-woven fabric substrate into rectangular pieces with the size of 200-300mm multiplied by 100-150mm, reserving a streamline water drop-shaped outline area at one end, performing gradient hydrophilic modification treatment on the rectangular non-woven fabric, taking 5-15% of the concentration of an inner hydrophilic agent, gradually reducing the concentration of an outer layer to 1-5%, drying for later use, and superposing a plurality of non-woven fabric substrates to form a hydrophilic expansion core layer substrate; s2, hot melting treatment of the inner layer and the outer layer: s2-1, uniformly sandwiching a super absorbent polymer powder or a thin layer in the inner layer of the substrate of the hydrophilic expansion core layer to form the hydrophilic expansion core layer; S2-2, carrying out hot melting compounding on the outer layer of the substrate of the hydrophilic expansion core layer to realize firm bonding under the conditions that the aperture is 1-3mm, the thickness is 0.2-0.5mm, the hot melting temperature is 120-150 ℃, the pressure is 0.5-2MPa and the time is 5-15 seconds, so as to form an expansion-limiting elastic limiting layer; S2-3, embedding at least 3 strands of one end of the taking-out rope into a reserved central area of a water drop-shaped taking-out end, carrying out hot melting surrounding fixation under the condition that the hot melting temperature is 130-160 ℃ and the hot melting point is at least 3 points, the embedding depth is more than or equal to 10mm and the hot melting time is 8-20 seconds, combining with stitching auxiliary fixation, ensuring the high-strength connection of the taking-out rope and the taking-out rope, and primarily shaping the streamline water drop-shaped taking-out end, wherein the curvature radius is 5-10mm, so as to form a composite layer; s3, manufacturing a wave folding buffering gap structure: Placing the composite layer after the hot melting treatment in the step S2 in a wave die, firstly carrying out longitudinal wave folding, wherein the height difference of wave crests and wave troughs is 4-10mm, the distance is 3-8mm, the number of folding layers is 4-8, and then carrying out spiral winding for 2-4 circles to naturally reserve the wave troughs as micro buffer gap channels after expansion, the target void ratio is 10-25%, and simultaneously ensurin