| 摘要 |
A cannula having a sleeve with a body having proximal and distal ends and defining a through passageway. First structure is provided on the body to define a first shoulder to abut a tissue wall through which the body extends. Second structure is provided on the body to define a second shoulder to abut a tissue wall through which the body extends. The first and second structures are spaced from each other to permit the first and second shoulders to abut separate, spaced tissue walls through which the body extends.
|
