Liposomes are vesicles similar to biomembrane bilayer structure, which are mainly composed of phospholipids and cholesterol. Their particle sizes are in the nanometer and micron levels. They are a new type of drug carrier. Lipid components can be biodegradable in vivo and have good tolerance. According to the concentric structure of liposomes, liposomes can be divided into concentric single compartment liposomes, multi compartment liposomes and non concentric multicapsular liposomes (MVL). Concentric liposomes are composed of one or more concentric lipid bilayers, and their structure is similar to table tennis or onion. The structure of multicapsular liposomes composed of non concentric multiple lipid layers is honeycomb like that of fruit pomegranate.
Among them, multicapsular liposome (MVL) is a new type of liposome prepared by reservoir foam technology. It is characterized by a large amount of accumulation at the injection site or in the dosing chamber. It has a good slow-release effect and reservoir effect, which can effectively reduce the number of medication for patients and improve their treatment compliance.