Medical decoupling instrument

A medical decoupling instrument for decoupling a medical insertion instrument from a pedicle screw, the medical decoupling instrument comprising:

• a shaft having a support surface;
• a sleeve which is arranged around a portion of the shaft, wherein the sleeve is slidable along and rotatable about the shaft through a predefined limited non-zero range of linear and angular motion;
• and
• a spring which is arranged between the support surface of the shaft and the sleeve;
• wherein
• the sleeve has projections provided for defined coupling to the medical insertion instrument;
• and
• the spring is provided to slide and rotate the shaft relative to the sleeve through the predefined limited non-zero range of linear and angular motion, self-actingly and automatically into a defined initial position along the predefined limited non-zero range of linear and angular motion;
• wherein the shaft has a peg-shaped projection at said portion of the shaft, the sleeve has a motion link, and the peg-shaped projection is received in the motion link such that the motion link defines the predefined limited non-zero range of linear and angular motion;
• wherein the motion link runs obliquely and thus extends both in a circumferential direction and an axial direction of the sleeve, such that a first end of the motion link is arranged closer to a distal end of the sleeve than a second end of the motion link in the axial direction and that the first end of the motion link is distanced from the second end of the motion link in the circumferential direction;
• and
• wherein the medical decoupling instrument is configured such that, by rotating the shaft about a longitudinal axis of the shaft with respect to the sleeve by an angle about the longitudinal axis of the shaft defined by the first end of the motion link and the second end of the motion link, the peg-shaped projection of the shaft moves along the motion link from the first end of the motion link to the second end of the motion link.