| 主权项 |
1. A surgical instrument for seating a pedicle screw, the surgical instrument comprising: a pressure ring or at least one guide element, or a pressure ring and at least one guide element, wherein the pressure ring or the at least one guide element, or a pressure ring and at least one guide element, is configured to operatively engage the pedicle screw and transfer motion of the surgical instrument to the pedicle screw; and a driver head configured for removably connecting to the pressure ring or the at least one guide element, or a pressure ring and at least one guide element, wherein the removable connection of the pressure ring or the at least one guide element, or a pressure ring and at least one guide element, from the driver head is twistable or slidable for purposes of exchanging the pressure ring or the at least one guide element, or a pressure ring and at least one guide element from the driver head, wherein a first guide element or a second guide element or a third guide element is integrally formed with the pressure ring, wherein the first guide element is configured to allow for a monoaxial motion of the pedicle screw relative to the driver head, the second guide element is configured to allow for a polyaxial motion of the pedicle screw relative to the driver head, and the third guide element is configured to rigidly fixate the driver head to the pedicle screw. |
