Stephen J. Blumenkranz,Bruce M. Schena,Randal P. Goldberg
申请号：
US16407158
公开号：
US20190269437A1
申请日:
2019.05.08
申请国别(地区):
US
年份:
2019
代理人:
摘要：
Embodiments of a cannula seal are disclosed. In some embodiments, a cannula seal can include a base portion that engages with a cannula； and a seal portion integrally formed with the base portion that slidebly engages with an instrument shaft such that an insertion frictional force between the seal portion and the instrument shaft for insertion of the instrument shaft is symmetrical and substantially equal with a retraction frictional force.
