Patent ID: 7241263

Claim:
A system for rotatably coupling a shaft of an insertable medical device to a housing while maintaining the effective length of the shaft during rotation, the system comprising: (i) a shaft adapter having a hollow body with a first end adapted to be secured to an end of a shaft of an insertable medical device, a second end adapted to be slidably connected to a rotary adapter, and a circular flange adjacent to the first end; (ii) a collar extending from the housing with a first end adapted to receive the flange on the shaft adapter and a threaded lumen with a first stop element and a second stop element, wherein the first stop element and the second stop element are spaced apart from one another at a predetermined width inside the collar; and (iii) a rotary adapter having a hollow body with a first end adapted to slidably connect to the second end of the shaft adapter and a second end comprising an engagement element, wherein the engagement element rides inside the threads of the collar, wherein rotation of the rotary adapter in the threaded collar causes incremental movement of the rotary adapter along the collar lumen until either the engagement element contacts the first stop element on the collar, limiting further rotation in the clockwise direction, or until the engagement element contacts the second stop element on the collar, limiting further rotation in the counterclockwise direction, wherein the effective length of the shaft is maintained during rotation.