Spinal compression instrument and related methods
AssigneeNuVasive, Inc.
InventorsConrad Tyler HAMMANN, Scott LISH
Life of this patent
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Abstract
The disclosure provides systems and instruments that allow vigorous compression of two bone structures while minimally impeding visual access to the surgical site. This is achieved by use of a sleeve member that connects a stanchion to a lever. The system includes a stanchion member, a sleeve member dimensioned to at least partially encircle the stanchion member, and a compression lever including. The sleeve and the lever form a pivot point to allow the compression lever to rotate relative to the stanchion member when the sleeve is reversibly placed around the stanchion member.
Claims20
A spinal compression instrument for compressing a first bone structure relative to a second bone structure, the instrument comprising:
- a stanchion member having an elongate shaft comprising a stanchion proximal end and a stanchion distal end, the stanchion distal end comprising a first bone anchor engagement feature adapted to engage a tulip portion of a first bone anchor;
- a sleeve member at least partially encircling the stanchion member;
- and
- a compression lever pivotably connected to the sleeve member at a pivot point to allow the compression lever to rotate relative to the stanchion member about an axis that contains the pivot point, the compression lever comprising a lever distal end and a lever proximal end, the lever distal end comprising a second bone anchor engagement feature, the second bone anchor engagement feature adapted to engage a tulip portion of a second bone anchor, the lever distal end further comprising an opening dimensioned to admit a spinal rod at least partially therein, wherein the opening is adapted to allow a spinal rod passing through the tulip portions of the first and second bone anchors to pass unencumbered through the opening in a direction that is lengthwise with respect to the spinal rod passing through the tulip portions.
A spinal compression instrument for compressing a first bone structure relative to a second bone structure, the instrument comprising:
- a stanchion member having an elongate shaft comprising a stanchion proximal end and a stanchion distal end, the stanchion distal end comprising a first bone anchor engagement feature adapted to directly engage a first bone anchor;
- a sleeve member at least partially encircling the stanchion member;
- and
- a compression lever pivotably connected to the sleeve member at a pivot point to allow the compression lever to rotate relative to the stanchion member about an axis that contains the pivot point, the compression lever comprising a lever distal end and a lever proximal end, the lever distal end comprising a second bone anchor engagement feature, the second bone anchor engagement feature adapted to directly engage a second bone anchor;
- wherein the instrument is adapted to directly engage the first bone anchor with the first bone engagement feature while the second bone engagement feature simultaneously and directly engages the second bone anchor, wherein movement of the lever distal end toward the stanchion distal end effectuates movement of the first bone anchor toward the second bone anchor while permitting a spinal rod passing from the first bone anchor to the second bone anchor and also passing from the stanchion distal end to the lever distal end to slide lengthwise past the lever distal end as the lever distal end is advanced toward the stanchion distal end.
A method of compressing a first bone structure relative to a second bone structure, the method comprising:
- providing an instrument wherein a stanchion member having an elongate shaft and a first bone anchor engagement feature is within a sleeve member such that the sleeve member at least partially encircles the stanchion member, and wherein a compression lever including a lever distal end and a second bone anchor engagement feature at the lever distal end is pivotably connected to the sleeve member at a pivot point to allow the compression lever to rotate relative to the stanchion member about an axis that contains the pivot point;
- securing a first bone anchor to the first bone structure, the first bone anchor comprising a first tulip portion;
- securing a second bone anchor to the second bone structure, the second bone anchor comprising a second tulip portion;
- positioning a spinal rod within the first tulip portion;
- positioning the spinal rod within the second tulip portion;
- engaging the first bone anchor engagement feature to the first bone anchor;
- engaging the second bone anchor engagement feature to the second bone anchor;
- and
- with the spinal rod positioned within the first tulip portion and within the second tulip portion, compressing the first bone structure relative to the second bone structure by imparting force on a proximal portion of the compression lever with a vector toward the stanchion member and thereby driving the first bone anchor along the spinal rod and towards the second bone anchor.
Dependencies are inferred from the claim text.