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CN-121221368-B - Multi-layer composite water-absorbing spacer for medical treatment and preparation method thereof

CN121221368BCN 121221368 BCN121221368 BCN 121221368BCN-121221368-B

Abstract

The invention discloses a multi-layer composite water-absorbing spacer for medical treatment and a preparation method thereof, and relates to the technical field of medical consumables. The invention comprises a layered structure, wherein the layered structure comprises a liquid permeable contact layer, a primary absorption layer, a liquid diversion layer, an integrated diversion net, an extraction conduit layer, a liquid retention layer and a liquid impermeable backing layer which are sequentially stacked from top to bottom, wherein the core innovation is that the extraction conduit layer for active suction is arranged, and continuous and efficient liquid diversion and discharge of the water absorption isolation pad are realized through integrating an active liquid extraction and negative pressure system, so that the long-term effective water absorption capability of the water absorption isolation pad is maintained, and the nursing quality and the medical care operation efficiency of patients are remarkably improved.

Inventors

  • LU LIN
  • YUE HAISHENG
  • YANG KUN

Assignees

  • 四川舒而医疗器械有限公司

Dates

Publication Date
20260512
Application Date
20251201

Claims (5)

  1. 1. A multi-layer composite medical water absorption spacer is characterized by comprising a layered structure, wherein the layered structure comprises a liquid permeable contact layer, a primary absorption layer, a liquid diversion layer, an integrated diversion net, an extraction conduit layer, a liquid retention layer and a liquid impermeable backing layer, which are sequentially stacked from top to bottom; The liquid permeable contact layer consists of a hydrophilic, high-breathability and non-irritating composite nonwoven fabric which is downwards and singly wet-guided, wherein the composite nonwoven fabric for preparing the liquid permeable contact layer comprises an upper hydrophobic layer and a lower hydrophilic layer, the contact angle of the hydrophobic layer is larger than 90 degrees through plasma fluorocarbon finishing, the pore diameter of the hydrophobic layer is 20-30 mu m, the contact angle of the hydrophilic layer is smaller than 60 degrees through nonionic surfactant finishing or plasma hydrophilic treatment, and the pore diameter of the hydrophilic layer is 40-60 mu m; The primary absorption layer is a wood pulp cellulose three-dimensional fiber net prepared by an air-laid process, water-absorbent resin particles are distributed in the wood pulp cellulose three-dimensional fiber net, the water-absorbent resin particles are in multi-layer gradient distribution with thin upper part and dense lower part in the wood pulp cellulose three-dimensional fiber net, the primary absorption layer is arranged to be of a gradient density structure comprising an upper layer, a middle layer and a lower layer, wherein the mass percentage of the water-absorbent resin particles of the upper layer is 20-30%, the length of the wood pulp fibers of the upper layer is 0.5-1.0 mm, the mass percentage of the water-absorbent resin particles of the middle layer is 30-40%, the length of the wood pulp fibers of the middle layer is 1.5-2.0 mm, the mass percentage of the water-absorbent resin particles of the lower layer is 40-50%, the length of the wood pulp fibers of the lower layer is 2.5-3.0 mm, and the total thickness of the primary absorption layer is 5-10 mm; The liquid diversion layer is made of a material with a three-dimensional structure, high porosity and high compression resilience, the material of the liquid diversion layer is PET three-dimensional reticular spacer fabric, the thickness is 6-8 mm, the porosity is not less than 85%, microprotrusion arrays with the height of 0.5-0.8 mm are uniformly molded on the upper surface and the lower surface of the liquid diversion layer, the distribution density of the microprotrusions is 20-30 microprotrusions/cm 2 , and the microprotrusions are conical or pyramidal; The integrated diversion net is arranged between the liquid diversion layer and the extraction conduit layer and is used for bridging liquid between the liquid diversion layer and the extraction conduit layer, the integrated diversion net is PET/Co-PET bi-component warp-knitted mesh cloth, and the ratio of the mesh aperture to the bottom diameter of the microprotrusions is 0.9-1:1; The extraction conduit layer comprises at least one extraction conduit, a plurality of liquid suction holes are formed in the extraction conduit, one end or two ends of the extraction conduit extend to the edge of the water absorption isolation pad and are connected with a negative pressure connecting port connected with an external negative pressure generating and controlling system; The liquid retention layer is formed by a cellulose fiber reinforced water absorbent resin composite material; The liquid impermeable backing layer is composed of a liquid impermeable and well flexible film material.
  2. 2. The multi-layer composite medical water absorption spacer according to claim 1, wherein the extraction catheter layer comprises a main catheter and branch catheters, an outer ring type main-inner branch distributed network is formed, the outer diameter of the main catheter is 3-4 mm, the inner diameter of the main catheter is 2-3 mm, the outer diameter of the branch catheter is not more than the height of a microprotrusion of the liquid guide layer, the pore diameter of the liquid absorption holes is 0.1-0.2 mm, the liquid absorption holes are arranged on the branch catheters in a spiral staggered mode, the pore distance is 0.8-1.2 mm, and the extraction catheter is made of medical grade silica gel or thermoplastic polyurethane.
  3. 3. The multi-layer composite medical water-absorbing spacer of claim 2, wherein the negative pressure connecting port is connected with an anti-reflux one-way valve, the working negative pressure is-20 to-30 mmHg, the extraction catheter layer is divided into 2-3 independent suction areas, and each area is provided with an independent catheter network and a negative pressure connecting port.
  4. 4. The multi-layer composite medical water-absorbing spacer of claim 1, wherein the layers of the water-absorbing spacer are bonded in a lattice or net pattern by hydrophilic hot melt adhesive, and the coverage rate of the hot melt adhesive is 15-25%.
  5. 5. The method for preparing the multi-layer composite medical water-absorbing spacer according to any one of claims 1 to 4, comprising the steps of: (1) Preparing and preprocessing materials, namely preparing each layer of material, carrying out plasma hydrophilic treatment on the liquid guide layer and the extraction catheter, and carrying out laser drilling on the extraction catheter; (2) The extraction conduit is fixed on the integrated guide net in a hot pressing or bonding mode; (3) Compounding the diversion layer, namely compounding the integrated diversion net with the liquid diversion layer by hot pressing, realizing mechanical interlocking by utilizing the microprotrusions on the surface of the liquid diversion layer and meshes of the integrated diversion net, and spraying hydrophilic hot melt adhesive between layers to fix the layers in a lattice or net pattern; (4) Stacking the liquid permeable contact layer, the primary absorption layer, the composite diversion layer, the liquid retention layer and the liquid impermeable backing layer obtained in the step (3) in sequence, realizing mechanical interlocking by utilizing the microprotrusions on the surface of the liquid diversion layer and the micro-groove array of the primary absorption layer, and spraying and fixing hydrophilic hot melt adhesive between the layers in a lattice or net pattern; (5) And (3) integrating edge sealing and ports, namely performing high-frequency hot-pressing edge sealing on the laminated structure, connecting a negative pressure connecting port with an extraction catheter, performing air tightness test, and obtaining the multi-layer composite medical water absorption spacer after the air tightness test is qualified.

Description

Multi-layer composite water-absorbing spacer for medical treatment and preparation method thereof Technical Field The invention relates to the technical field of medical consumables, in particular to a multi-layer composite water absorption spacer for medical use and a preparation method thereof. Background In modern medical practice, the water-absorbing spacer is an indispensable consumable, and has wide application field, covering various scenes from regular wound care, body fluid management in operation process to body fluid absorption of incontinence patients. The product has key effects of maintaining dry skin of a patient, preventing infection, improving comfort and optimizing medical care operation procedures. With the continuous advancement of medical technology and the increasing demands on patient care standards, the market also presents a more stringent trend in terms of performance requirements of the water-absorbing barrier, especially in terms of efficient water absorption, long-term functionality maintenance, and structural integration, conventional water-absorbing barrier solutions are facing unprecedented challenges. The core working principle of the conventional water-absorbing spacer is based on a limited, static passive absorption and storage mechanism, namely, the water-absorbing material absorbs and temporarily intercepts liquid by capillary action or expansion of high-molecular water-absorbing resin (Super Absorbent Polymer, SAP), no matter how well the material composition or structural design is optimized. Once its internal voids are filled, or the water-absorbing polymer reaches the saturation limit, its water-absorbing capacity is suddenly reduced or even completely lost. This "collect before fill, fail over" feature determines that it necessarily exposes a performance bottleneck in the face of high throughput, long-term or sudden high dose fluid management requirements. In particular, even if there is a margin in the total capacity of the absorbent pad, rapid saturation of the local area may cause a significant decrease in the overall water absorption efficiency thereof, and the liquid may not be effectively guided to the unsaturated area, thereby causing waste of resources. More importantly, this passive absorption mode lacks a continuous and dynamic fluid management mechanism that actively drains the absorbed fluid from the pad body, thereby effecting regeneration or maintenance of the absorbent pad "activity". The inherent limitation not only results in frequent replacement demands and increased medical waste, but also, more importantly, in medical scenes (such as large-scale operations, intensive care and long-term bedridden nursing) requiring long-term maintenance of dry and comfortable environments, the medical waste cannot provide continuous and reliable water absorption guarantee, and the problems of rewet, side leakage and the like are extremely easy to cause, so that the skin health of patients is influenced, even the infection risk is increased, and negative effects are brought to the working efficiency of medical staff and the life quality of the patients. Such as the butterfly-shaped breast pad disclosed in the publication CN101926518a, the core design of this solution is to alleviate the problem of rapid saturation of a single absorbent layer by providing an up-down distribution of absorbent layers, by activating the uncontaminated or unsaturated absorbent layer areas at different times, thus providing a longer effective life cycle for the user, whereas, while the butterfly-shaped breast pad described above exhibits certain advantages in certain application scenarios, it is still a conventional absorbent pad based on a limited, static passive absorption and storage mechanism, there is still the inherent limitation of the conventional absorbent pad, firstly, its absorbent capacity is still limited by the static absorption capacity of the material itself, and its structure lacks an active, effective liquid diversion and distribution mechanism, which means that the absorbent area may rapidly reach local saturation in the face of continuous or local high flow of body fluid exudation, thus resulting in uneven or local liquid accumulation. Secondly, the structure relies on manual adjustment of the upper and lower water absorbing layers to realize function conversion, and if the inventive concept is applied to a medical environment with high attention to efficiency and sanitation, the operation burden of medical staff is certainly increased, precious time is possibly consumed, and the infection risk is possibly increased due to pollution of the water absorbing area of the unsaturated water absorbing layer. Another patent application publication CN114652537a discloses a nursing device for urology surgery. The device is provided with the water absorption pad in the through groove of the bed body and innovatively combines the heating mechanism to keep the buttocks of a patien