Device for placing a receiving part onto a head of a bone anchoring element

A receiving part for connecting a bone anchoring element having a head and a shank to a spinal rod, the receiving part having a top end, a bottom end, and a longitudinal axis extending between the top and bottom ends, and comprising:

• an outer wall extending from the top end to the bottom end;
• and
• an inner wall facing radially inwardly towards the longitudinal axis and defining a bore extending from the top end towards the bottom end, an opening at the bottom end, and a seat for the head of the bone anchoring element adjacent the opening;
• wherein a rod receiving channel with a substantially U-shaped profile has a first portion that extends transversely through a first side of the receiving part to form opposing sidewalls that face one another and that extend continuously from the outer wall to the inner wall on one side of the bore, and a second portion that extends transversely through an opposite second side of the receiving part;
• wherein the inner wall comprises an engagement feature for engaging a locking element that is configured to lock the spinal rod in the rod receiving channel;
• and
• wherein a recess that is spaced apart from the top end is formed in at least one of the opposing sidewalls and extends continuously from the outer wall to the inner wall for engaging a corresponding feature of a device configured to place the receiving part onto the head of the bone anchoring element, and wherein a maximum depth of the recess measured from the at least one of the opposing sidewalls to a bottom of the recess is substantially the same at the outer wall and at the inner wall.

A bone anchoring device for connecting a bone anchoring element having a head and a shank to a spinal rod, the bone anchoring device comprising:

• a monolithic locking element;
• and
• a receiving part having a top end, a bottom end, and a longitudinal axis extending between the top and bottom ends, and comprising:
• an outer wall extending from the top end to the bottom end;
• and
• an inner wall facing radially inwardly towards the longitudinal axis and defining a bore extending from the top end towards the bottom end, an opening at the bottom end, and a seat for the head of the bone anchoring element adjacent the opening;
• wherein a rod receiving channel with a substantially U-shaped profile has a first portion that extends transversely through a first side of the receiving part to form opposing sidewalls that face one another and that extend continuously from the outer wall to the inner wall on one side of the bore, and a second portion that extends transversely through an opposite second side of the receiving part;
• wherein the locking element is engageable with an engagement feature on the inner wall to block removal of the spinal rod from the top end of the receiving part;
• and
• wherein a downward facing surface directed at least partially towards the bottom end of the receiving part is formed in at least one of the opposing sidewalls and extends continuously from the outer wall to the inner wall for engaging a corresponding feature of a device configured to place the receiving part onto the head of the bone anchoring element, and wherein at least part of the downward facing surface is at a same axial height on the receiving part as part of the engagement feature.

A kit comprising:

• a receiving part for connecting a bone anchoring element having a head and a shank to a spinal rod, the receiving part having a top end, a bottom end, and a longitudinal axis extending between the top and bottom ends, and comprising:
• an outer wall extending from the top end to the bottom end;
• and
• an inner wall facing radially inwardly towards the longitudinal axis and defining a bore extending from the top end towards the bottom end, an opening at the bottom end, and a seat for the head of the bone anchoring element adjacent the opening;
• wherein a rod receiving channel with a substantially U-shaped profile has a first portion that extends transversely through a first side of the receiving part to form opposing sidewalls that face one another and that extend continuously from the outer wall to the inner wall on one side of the bore, and a second portion that extends transversely through an opposite second side of the receiving part;
• wherein the inner wall comprises a first engagement feature for engaging a locking element that is configured to lock the spinal rod in the rod receiving channel;
• and
• wherein a second engagement feature different from the first engagement feature is formed along at least one of the opposing sidewalls, with at least part of the second engagement feature being at a same axial height on the receiving part as part of the first engagement feature;
• and
• a device configured to place the receiving part onto the head of the bone anchoring element, the device comprising a corresponding feature for engaging the second engagement feature to hold the receiving part to the device.