Scope of Application * Establish the working channel in endoscopic surgery , laparoscopic surgery, small incision surgery, protect the incision from damage or reduce the infection of incision. Product Characteristics * Set a filter in exhaust to protect medical staff from pollution. * Perfect sealing design to keep pneumoperitoneum in operation. * Has protector which made by silicone. * Single-use avoid cross infection. * Supply nice gas barrier property and sealing to make the operation safe. * Can be inserted a variety of surgical instruments during surgery simultaneously. * Effectively isolate the incision with the outside.