Patent ID: 8496630

Claim:
A transendoscopic medical instrument comprising: an x-ray marker member formed of a radiopaque material; a sheath having a distal end, a proximal end and an internal space between the distal end and the proximal end, the sheath being configured to insert the x-ray marker member into the internal space from a proximal side of the sheath and the sheath including a distal end opening portion in which an inner diameter is reduced from a proximal side of the distal end to a tip end at the distal end of the sheath; a guide unit which is configured to be inserted into the internal space of the sheath, which includes a flexible elongated member and a bendable distal end action portion connected to a distal part of the flexible elongated member, the bendable distal end action portion including a tip end portion, a base portion and a joint between the tip end portion and the base portion, and the bendable distal end action portion being configured to push the x-ray marker member to a distal side of the sheath, being configured to be protruded with respect to the distal end opening portion of the sheath and being configured to guide the sheath; and a latch portion which is configured to latch the guide unit with respect to the sheath at a predetermined position and which includes; a first latch part which latches the guide unit at a first position where the x-ray marker member and the whole bendable distal end action portion of the guide unit are housed in the internal space of the sheath; a second latch part which latches the guide unit at a third position where the sheath can be guided to a target region by fully protruding the base portion of the bendable distal end action portion and a part including the distal part of the flexible elongated member of the guide unit from the distal end opening portion of the sheath; and a third latch part which latches the guide unit at a second position where the x-ray marker member is placed and kept at a position to which at least a part including the tip end portion is protruded to the distal end opening portion of the sheath, and at least a part including the base end portion is housed into the internal space of the sheath.