Described herein are cannulas having a stepped exterior. Also described are methods of making and using these cannulas, for example to deliver one or more materials to the central nervous system of an animal.
申请公布号
US2006135945(A1)
申请公布日期
2006.06.22
申请号
US20050243756
申请日期
2005.10.05
申请人
AVIGEN, INC., THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
