Medical treatment endoscope

A medical treatment endoscope comprising:

• a sheath having a flexibility, in which a first lumen with an open end is formed;
• at least one arm member having a second lumen with an open-end extending in the axial direction into which a procedure device for performing a procedure in an organ is insertable, and a bending part for performing bending actions, a front end of the arm member projecting out from the open end of the first lumen;
• an open/close mechanism which directs the arm member projecting out from the first lumen from a direction along the central axis of the sheath to a direction deviated from the central axis of the sheath, and from a direction deviated from the central axis of the sheath to a direction along the central axis of the sheath;
• and
• a viewing device and an illuminating member that are disposed to a front end side of the sheath.

A medical treatment endoscope comprising:

• a first sheath having a flexibility and an open end;
• a second sheath that is provided with a first arm member that has a front end and a base end and is inserted so that the front end area projects out from the first sheath, and that has a bending part that is freely bending through manipulation by an operator;
• a third sheath provided with a second arm member that has a front end and a base end and is inserted so that the front end region projects out from the first sheath, and that has a bending part that is freely bending through manipulation by the operator;
• a viewing device that is independently disposed at the front end of the first sheath from the second sheath and the third sheath, and is for viewing a target image;
• and
• an illuminating member that is independently disposed at the front end of the first sheath from the viewing device, the second sheath and the third sheath, and is for radiating illuminating light on the target image.

A medical treatment endoscope comprising:

• a sheath having a flexibility;
• an arm means that projects out from the end of the sheath and is for performing bending actions;
• an open/close means which directs the arm means from a direction along a central axis of the sheath to a direction deviated from the central axis of the sheath, and from a direction deviated from the central axis of the sheath to the direction of the central axis of the sheath;
• a viewing means for viewing an area further toward the front end than the sheath;
• and
• an advance/retract means for advancing or retracting the arm means with respect to the sheath.