| 摘要 |
A cannula scaling apparatus includes a plurality of seal members 34, 36 each having a different sized aperture with which surgical instruments of different sizes may be inserted in a first direction to seal with a selected seal member. At least one seal member is pivotable from an operative position, in which a surgical instrument can be inserted in the first direction to seal with that member, and an inoperative position, characterised in that the pivot axis of the pivotal movement of the sealing member is in a second direction, transverse to the first direction. Preferably, the cannula sealing apparatus includes a housing 28 having a central axially facing aperture 32; a surgical instrument of nominal 12 mm diameter may seal with this central axially facing aperture. Alternatively, a seal member having an aperture that will seal with a surgical instalment of a different diameter (e.g. 5 mm or 10 mm) may be swung up to be aligned with the central aperture. Preferably, each seal member is pivotal about a common axis and has a surface that faces the housing such that both parts can seal at their facing surfaces when either of the seal members are swung up into the position where their aperture is over the central aperture. |
