Patent ID: 7824376

Claim:
An injection needle apparatus suitable for forming an injection in a tissue in a body cavity, the apparatus comprising: an elongated outer tubular member that is configured to be inserted into the body cavity and has a central axis in a longitudinal direction; an elongated flexible inner tubular member that is inserted into the outer tubular member, movable in the longitudinal central axis direction of the outer tubular member, rotatable about the longitudinal central axis of the outer tubular member, and has its respective central axis in a longitudinal direction; a needle body for insertion that is supported at a distal end part of the inner tubular member and has a distal end sharp part eccentrically arranged from the longitudinal central axis to a lateral side of the inner tubular member; an operating portion that is located on a proximal end side of the inner tubular member, configured to operate a proximal end part of the inner tubular member to move the inner tubular member in the longitudinal axis direction of the outer tubular member, and to project and retract the needle body from and into a distal end of the outer tubular member; and a needle body rotation operating device that is interposed between the distal end part of the inner tubular member and the distal end part of the outer tubular member, and configured to completely rotate the needle body around the central axis in the longitudinal axis direction of the inner tubular member through rotation angles corresponding to the number of times the inner tubular member is moved in the longitudinal axis direction, to change a rotational and not axial position of the distal end sharp part.