RESUMO
Electrospinning is a technology that uses a high-voltage electrostatic field to prepare ultrafine fibers, which are widely used in tissue engineering and biomedical fields because the nanofiber materials prepared have strong mechanical strength and can mimic the structure of extracellular matrix (ECM). In this paper, the characteristics of synthetic and natural polymers for the preparation of medical dressings by electrostatic spinning were described in detail, and their advantages and disadvantages were compared according to the source of the matrix polymer. Several kinds of loaded substances used in wound dressing were summarized, the mechanism of the dressing to promote wound healing was described, and the problems of making electrospinning wound dressing were analyzed, in order to promote the further development of electrospinning technology in the field of wound dressing.
RESUMO
Objective To summarise the imaging features of rare mastitis and explore the diagnostic value of ultrasound, mammography and MRI for rare mastitis. Methods The record of 24 patients diagnosed as rare mastitis in our hospital from Jan. 2000 to Jun. 2009 was reviewed, including clinical manifestations, pathological results, imaging diagnosis and diagnostic accurate rate. Results Of the 24 patients, 14 patients were ductal ectasia with chronic mastitis, 3 granulomatous mastitis, 6 chronic abscess and 1 mammary tuberculosis. 13 patients underwent ultrasonic scan, 12 patients underwent mammography and 3 patients underwent MRI, with the diagnostic accurate rate 77%, 25% and 100% respectively. Conclusions There are no special imaging manifestations for most rare mastitis, however, some differential characteristics still exist. MRI has a higher accuracy compared to ultrasound and mammography. The combination of multiple imaging methods can improve diagnostic accuracy.