| 摘要 |
The present invention refers to a device, such as a trocar intended to penetrate a body wall in endoscopic surgery to establish a passageway allowing insertion therethrough of surgical instruments, and comprising a tubular sleeve extending through the passageway and having one proximal and one distal end. The device in accordance with the invention is characterized in that the distal end is arranged to be contracted such that it assumes dimensions not exceeding the surgical orifice to allow said end to be introduced into said orifice, and thereafter to expand when applied in position such that is assumes downwards gradually increasing dimensions transversely exceeding the dimensions of the device at the place of the surgical orifice, whereby a funnel-shaped distal end is formed. |
