| 摘要 |
A surgical device includes a tubular member, a ring made of flexible material, a resilient membrane, and a pusher member. The ring is disposed in a collapsed insertion configuration inside the tubular member and has an expanded configuration surrounding or defining an aperture, the resilient membrane being connected to the ring along an entire circumference thereof so that the membrane is at least coextensive with the aperture, thereby closing or blocking the aperture. The membrane is also disposed in a folded configuration inside the tubular member. The pusher member extends into the tubular member from a proximal end thereof for ejecting the collapsed ring and the folded membrane from a distal end of the tubular member. The ring has internal spring forces or stresses tending to open the ring from the collapsed insertion configuration to the expanded configuration upon an ejection of the ring from the tubular member.
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