Methods The proper expander was placed subcutaneously or in sub-galeaaponeurotic layer, while the tube was cutted from the injective dome and pulled out from the subcutaneous tunnel.

• 方法选择合适的扩张器,在皮下或帽状腱膜下放置．将导管靠近注射壶处剪断后,从皮下隧道穿出,用一个小接口将两个断端连接,用丝线在接口凹槽处结扎固定,术后注意保护注射壶。