|
1. A medical decoupling instrument for decoupling a medical insertion instrument from a pedicle screw, comprising: a shaft and a sleeve which is arranged around a portion of the shaft, said sleeve being configured for defined coupling to the medical insertion instrument, wherein the shaft is rotatable about a longitudinal axis of the shaft with respect to the sleeve, and wherein the medical decoupling instrument is configured to move the shaft and the sleeve self-actingly and automatically into a defined initial position, the medical decoupling instrument further comprising a spring which is arranged between a support surface, which is provided on the shaft, and the sleeve and is arranged to move the shaft and the sleeve into the defined initial position via its spring force, wherein the shaft has a peg-shaped projection at the portion around which the sleeve is arranged, the sleeve has a motion link, and the peg-shaped projection of the shaft is received in the motion link of the sleeve such that the motion link defines a range of rotation of the shaft with respect to the sleeve, 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 by an angle defined about the longitudinal axis of the shaft 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.
|
