Multi-layer foam dressing for negative pressure sealing drainage and manufacturing method thereof

Abstract

The invention provides a multi-layer foam dressing for negative pressure sealing drainage and its manufacturing method. The multi-layer foam dressing for negative pressure sealing drainage includes a negative pressure conduction layer, which is arranged at the lower part of the negative pressure conduction layer for contact with the wound surface or The drainage protection layer in contact with the wound cavity, the negative pressure conduction layer and the drainage protection layer are both porous foam material layers; the negative pressure conduction layer is a hydrophobic porous foam material layer, and the drainage protection layer is a hydrophilic porous foam Material layer, two layers of materials are fixedly connected and the pores are infiltrated and communicated with each other. There are two longitudinal fractures on the multi-layer foam dressing, the longitudinal fractures are located at the position where the negative pressure drainage tube is installed, and one end of the negative pressure drainage tube is installed through the position where the hole of the negative pressure drainage tube is installed to extend to the multi-layer The middle of the foam dressing. The thickness a of the negative pressure conducting layer is 0.5-10 cm, and the pore diameter is 1-2.5 mm. The thickness b of the drainage protection layer is 0.1-3.5 cm, and the pore diameter is 0.2-1 mm. Simultaneously, the invention also provides two methods of making the above-mentioned foam dressing, bonding and compounding. The invention adopts a multi-layer structure, which can effectively improve its negative pressure conduction performance while ensuring the safety of the material, and is not easy to be blocked during use, has stable permeability and excellent therapeutic effect.

Description

Technical field [0001] The invention relates to the field of medical trauma treatment equipment, and specifically to a multilayer foam dressing for negative pressure sealing and drainage and a manufacturing method thereof. Background technique [0002] Vacuum sealing drainage (VSD) was pioneered by Dr. Wim Fleischman of ULM University in Germany in 1992, and formed a theoretical prototype for the drainage of limb wounds. In 1994, Professor Ju Huade from China applied the vacuum sealing drainage technology for the first time General surgery pioneered the application of negative pressure sealing drainage technology in general surgery. Professor Wang Yanfeng and Professor Qiu Huade obtained patent CN 2236350 in China on March 17, 1997, which was the first patent for negative pressure sealing drainage technology. [0003] The basic configuration of the existing VSD technology includes negative pressure sources (including medical suction machines, central negative pressure devices used ...

AI Technical Summary

Problems solved by technology

The use of PU dressings has a short dressing change cycle (US FDA reports and related literature show that it should not exceed three days), high cost, high labor intensity for medical staff, and more pain for patients

Hydrophilic dressing (PVA) is wet due to its hydrophilic properties. Although its permeability is low, it can also meet the treatment requirements of negative pressure drainage. However, because the material contains water, its negative pressure conductivity is poor. Poor, when used on a large area of ​​wounds, it is easy to produce a weak negative pressure conduction area, and secondly, the PVA material tends to gradually dry out after dehydration, resulting in a further decrease in permeability and weakening the therapeutic effect

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