Objective
The vast majority of pain is a clinical one of the symptoms of common diseases,Serious impact on people's lives and work,and has developed as to endanger human health,one of the main killers.At present,the general application of clinical pain medication for the treatment of pain of the main means of disease,if the recourse to the poor efficacy of surgery.In recent years,opioid analgesics in a wide range of clinical applications,has achieved good results,but there are serious side eff...