| 摘要 |
A lipped cannula includes a cylindrical member having a distal end for being inserted through a portal of minimal size in anatomical tissue of a wall of the body, a proximal end and a lip spaced proximally from the distal end and a housing mounting the proximal end of the cylindrical member. The lip has a periphery that is spaced outwardly from the circumference of the cylindrical member allowing a surface of the lip to engage an internal surface of the anatomical tissue when the distal end of the cannula is inserted in the body to prevent the distal end from backing out of the body. A lumen of the lipped cannula allows various surgical instruments to be inserted at an operative site in the body through the lumen with the lipped cannula preventing extravasation. A method of introducing a surgical instrument at an operative site in the body in endoscopic procedures includes the steps of forming a portal of minimal size in tissue of a wall of the body adjacent the operative site, inserting an end of a cannula into the body through the portal, positioning a lip of the cannula within the body against an internal surface of the wall to prevent backing out of the cannula from the body and introducing a surgical instrument at the operative site through a lumen of the cannula.
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