| 摘要 |
A cannula assembly for use in a surgical procedure, which comprises a cannula member defining a longitudinal axis, the cannula member defining a longitudinal opening therethrough for passage of a surgical instrument; and a composite sealing member (218) extending across the longitudinal axis and having a predetermined shape prior to insertion of the instrument, the sealing member comprising a fabric portion (228), the sealing member having an hourglass shape defining an aperture for the receipt of the instrument and arranged so that insertion of the instrument causes the sealing member to contact the outer surface of the instrument to form a substantial seal therewith. |
