Abstract: A trocar sleeve characterized by an annular flange adjacent a proximal end, a disc-shaped annular stop spaced from the annular flange in a distal direction and helically extending thread extending from said annular disc-shaped stop toward the distal end to prevent the removal of the sleeve from a puncture. The sleeve is used in conjunction with the trocar, which is provided with a disc-shaped annular stop between its ends, which engages the proximal end of the sleeve as the trocar is inserted therethrough and with cutting edges of the trocar being exposed to the distal end of the sleeve. The sleeve and trocar form a device which is used to form a puncture in the wall of a patient and then, after the distal end of the sleeve has been inserted in the puncture, the sleeve is rotated to thread the sleeve into the puncture to a position to prevent its removal.

Abstract: An endoscope having a sheath containing both a telescope and a laser lens system with attachments for both ranging and distancing the laser focal point and for reducing the diameter of laser beam source.