Self-retaining electrically insulative trocar sleeve and trocar

摘要: A trocar sleeve characterized by an annular flange adjacent a proximal end, disc-shaped stop spaced from the in distal direction and helically extending thread said toward end to prevent removal of puncture. The is used conjunction with trocar, which provided between its ends, engages as inserted therethrough cutting edges being exposed sleeve. form device puncture wall patient then, after has been puncture, rotated into position removal. particular useful for insertion various instruments, such endoscopes, perform internal surgery is, preferably, insulating inner layer.