| 摘要 |
A cannula ( 1 ) comprises a distal hollow tubular section ( 2 ), a proximal instrument insertion section ( 3 ), a lip seal ( 4 ) for sealingly engaging with an instrument shaft ( 5 ), and a duck-bill seal ( 10 ) also for sealingly engaging with the instrument shaft ( 5 ). The lip seal ( 4 ) is movably coupled to the proximal section ( 3 ) by a coupling section, provided in the form of a flexible tubular sheath section ( 6 ). The distal section ( 2 ) defines an access channel ( 7 ) for extension of the instrument shaft ( 5 ) therethrough. The proximal section ( 3 ) has a proximal opening ( 8 ) through which the instrument shaft ( 5 ) may be inserted into the proximal section ( 3 ). The distal end of the flexible section ( 6 ) is fixedly attached to the proximal section ( 3 ), and the proximal end of the flexible section ( 6 ) is fixedly attached to the lip seal ( 4 ). The flexible section ( 6 ) facilitates relative movement between the lip seal ( 4 ) and the proximal section ( 3 ) to accommodate lateral movement of the instrument ( 5 ) while maintaining the seal between the lip seal ( 4 ) and the instrument ( 5 ).
|
