Figure 1: (a) A device set required to insert the flexible port. The set is composed of the flexible port itself, the guide wire for traction into the abdominal cavity, and the disposable surgical drape. First, prepare the flexible port set. One flexible port set allows the setting of two ports of the same diameter. (b) The sockets at both ends of the flexible port are made of polymer resin with a low friction coefficient. The loop wire at the socket apex is used for traction at the time of GI tract penetration and for guidance of the port-separated socket outside the body. The square wave structure of the port reduces friction and is useful in preventing the device to be inserted from getting stuck, the deformation of the port bore, and the slippage at the site of port insertion, and in improving the flexibility of the port in the longitudinal direction.