Control mechanism for steerable rod

A control mechanism for controlling a rod having a preformed bent and at least one key, the control mechanism comprising:

• a handle comprising a sliding ring, a sliding shaft and a drive shaft, each extending along a longitudinal axis and comprising a central opening;
• wherein
• the sliding ring is threadedly connected to the sliding shaft;
• the drive shaft and the sliding shaft are connected by blocking means which prevent axial rotation between the drive shaft and the sliding shaft and which allow the drive shaft to slide within the sliding shaft;
• and
• the drive shaft and the sliding ring are connected by connecting means which prevent axial displacement between the drive shaft and the sliding ring and which allow axial rotation between the drive shaft and the sliding ring;
• and
• the internal surface of the drive shaft comprises at least one longitudinal groove or keyseat configured to engage the at least one key of the rod;
• and
• a friction reduction cannula configured to receive the rod;
• wherein the friction reduction cannula is secured to the sliding shaft or to the drive shaft.