Multi-layer foam dressing for negative pressure closed drainage and preparation method thereof

Abstract

The invention provides a multi-layer foam dressing for negative pressure closed drainage and a preparation method thereof. The multi-layer foam dressing for negative pressure closed drainage comprises a negative pressure conduction layer; the lower part of the negative pressure conduction layer is provided with a drainage protection layer which is contacted with a wound surface or a wound cavity; the negative pressure conduction layer and the drainage protection layer are porous foam material layers; the negative pressure conduction layer is a hydrophobic porous foam material layer; the drainage protection layer is a hydrophilic porous foam material layer; the two layers of materials are fixedly connected and pores mutually penetrate and are communicated. Two longitudinal broken joints are formed on the multi-layer porous foam dressing; the longitudinal broken joints are formed at the installation positions of negative pressure drainage tubes, and extend to the middle part of the multi-layer porous foam dressing from the installation ends of the negative pressure drainage tubes by passing through the installation positions of negative pressure drainage tube holes. The thickness a of the negative pressure conduction layer is 0.5cm to 10cm, the pore diameter is 1mm to 2.5mm, the thickness b of the drainage protection layer is 0.1cm to 3.5cm, and the pore diameter is 0.2mm to 1mm. Meanwhile, the invention also provides a splicing method and a compound method for preparing the foam dressing. According to the dressing and the method, a multi-layer structure is adopted, so that the negative pressure conduction performance can be effectively improved while the material safety is ensured; in addition, blockage does not easily occur during a use process, the permeability is stable, and the treatment effect is excellent.

Description

technical field [0001] The invention relates to the field of medical wound treatment equipment, in particular to a multi-layer foam dressing for negative pressure sealing drainage and a manufacturing method thereof. Background technique [0002] Vacuum sealing drainage (VSD for short) was pioneered by Dr. Wim Fleischman of ULM University in Germany in 1992, and formed a theoretical prototype for the drainage of extremity wounds; in 1994, Professor Qiu Huade of China applied the vacuum sealing drainage technology for the first time In general surgery, pioneered the application of negative pressure sealing drainage technology in general surgery. The patent CN 2236350 authorized by Professor Wang Yanfeng and Qiu Huade in China on March 17, 1997 was the first patent of 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 devi...

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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