5. Conclusion
VSD is a good wound treatment; however, its popularity and application are limited owning to its high price. The efficacy of the improved VSD in the treatment of SSI in this study was comparable to that of VSD, and its the price was only 1-third of its price. Because the selected materials are common and easy to obtain in the clinic, the price is low, the technique of application of VSD is easy to learn, and both nurses and residents can be replaced independently after training, which is conducive to its popularization and application.