A medical treatment implement including: a shaft extending along a longitudinal axis； a housing having distal and proximal portions, a proximal end of the shaft being attached to the distal portion of the housing to extend from the distal to the proximal portion, the elongated shaft being rotatable about the longitudinal axis relative to the housing； an effector attached to a distal end of the shaft, the effector articulating relative to the longitudinal axis； a drive mechanism having an output connected to the effector to articulate the effector relative to the shaft； and an input unit attached to the housing at a position closer to the proximal portion than the distal portion, wherein the input unit receives an operation input and directly inputs the drive mechanism in response to the input, wherein the input unit rotates about the longitudinal axis together with the shaft relative to the housing.
