Derotation instrument with reduction functionality
First Claim
Patent Images
1. An instrument for manipulating and a bone anchor and a spinal fixation element offset from the bone anchor, the instrument comprising:
- a shaft having a proximal end, a distal end, and a lumen extending between the proximal end and the distal end,one or more fingers disposed at the distal end of the shaft configured to engage a spinal fixation element receiving member of a bone anchor and defining a slot for receiving a spinal fixation element offset from the spinal fixation element receiving member;
an outer sleeve disposed about the shaft and configured to slide over the distal end of the shaft between a first position and a second position, when the outer sleeve is in the first position, the one or more fingers are unconstrained by the outer sleeve allowing the one or more fingers to receive the spinal fixation element in the slot and engage the spinal fixation element receiving member, when the outer sleeve is in the second position, the one or more fingers are constrained by the outer sleeve securing the spinal fixation element in the slot and the engagement of the spinal fixation element receiving member of the bone anchor by the one or more fingers to permit manipulation of the spinal fixation element and bone anchor by the instrument; and
a reduction element configured to pass through the lumen of the shaft and engage the offset spinal fixation element to reduce the offset spinal fixation element into the spinal fixation element receiving member of the bone anchor.
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Accused Products
Abstract
Instruments and methods are provided for manipulating a bone anchor and a spinal fixation element. The instruments and methods disclosed herein are particularly suited to facilitate rotation of a bone anchor relative to another bone to correct the angular rotation of the vertebrae attached to the bone anchor. The instrument does not require the spinal fixation element to be inserted into the bone anchor prior to manipulation. The instrument further may be used in the insertion of the spinal fixation element into the bone anchor.
248 Citations
20 Claims
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1. An instrument for manipulating and a bone anchor and a spinal fixation element offset from the bone anchor, the instrument comprising:
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a shaft having a proximal end, a distal end, and a lumen extending between the proximal end and the distal end, one or more fingers disposed at the distal end of the shaft configured to engage a spinal fixation element receiving member of a bone anchor and defining a slot for receiving a spinal fixation element offset from the spinal fixation element receiving member; an outer sleeve disposed about the shaft and configured to slide over the distal end of the shaft between a first position and a second position, when the outer sleeve is in the first position, the one or more fingers are unconstrained by the outer sleeve allowing the one or more fingers to receive the spinal fixation element in the slot and engage the spinal fixation element receiving member, when the outer sleeve is in the second position, the one or more fingers are constrained by the outer sleeve securing the spinal fixation element in the slot and the engagement of the spinal fixation element receiving member of the bone anchor by the one or more fingers to permit manipulation of the spinal fixation element and bone anchor by the instrument; and a reduction element configured to pass through the lumen of the shaft and engage the offset spinal fixation element to reduce the offset spinal fixation element into the spinal fixation element receiving member of the bone anchor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for manipulating one or more vertebrae, the system comprising:
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a first instrument comprising; a shaft having a proximal end, a distal end, and a lumen extending between the proximal end and the distal end, one or more fingers disposed at the distal end of the shaft configured to engage a spinal fixation element receiving member of a bone anchor and defining a slot for receiving a spinal fixation element offset from the spinal fixation element receiving member; an outer sleeve disposed about the shaft and configured to slide over the distal end of the shaft between a first position and a second position, when the outer sleeve is in the first position, the one or more fingers are unconstrained by the outer sleeve allowing the one or more fingers to receive the spinal fixation element in the slot and engage the spinal fixation element receiving member, when the outer sleeve is in the second position, the one or more fingers are constrained by the outer sleeve securing the spinal fixation element in the slot and the engagement of the spinal fixation element receiving member of the bone anchor by the one or more fingers to permit manipulation of the spinal fixation element and bone anchor by the instrument; and a reduction element configured to pass through the lumen of the shaft and engage the offset spinal fixation element to reduce the offset spinal fixation element into the spinal fixation element receiving member of the bone anchor; a second instrument comprising; a shaft having a proximal end, a distal end, and a lumen extending between the proximal end and the distal end, one or more fingers disposed at the distal end of the shaft configured to engage a spinal fixation element receiving member of a bone anchor and defining a slot for receiving a spinal fixation element offset from the spinal fixation element receiving member; an outer sleeve disposed about the shaft and configured to slide over the distal end of the shaft between a first position and a second position, when the outer sleeve is in the first position, the one or more fingers are unconstrained by the outer sleeve allowing the one or more fingers to receive the spinal fixation element in the slot and engage the spinal fixation element receiving member, when the outer sleeve is in the second position, the one or more fingers are constrained by the outer sleeve securing the spinal fixation element in the slot and the engagement of the spinal fixation element receiving member of the bone anchor by the one or more fingers to permit manipulation of the spinal fixation element and bone anchor by the instrument; and a reduction element configured to pass through the lumen of the shaft and engage the offset spinal fixation element to reduce the offset spinal fixation element into the spinal fixation element receiving member of the bone anchor; and a connector connecting the first instrument and the second instrument, the connector including a first receiving element for receiving the first instrument and a second receiving element for receiving the second instrument, the first receiving element being adjustable relative to the second receiving element. - View Dependent Claims (9, 10)
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11. A method of manipulating a bone anchor and spinal fixation element, the method comprising:
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connecting a bone anchor to a vertebra; positioning a spinal fixation element in proximity to a receiving member of the bone anchor; connecting an instrument comprising; a shaft having a proximal end, a distal end, and a lumen extending between the proximal end and the distal end, one or more fingers disposed at the distal end of the shaft configured to engage a spinal fixation element receiving member of a bone anchor and defining a slot for receiving a spinal fixation element offset from the spinal fixation element receiving member; an outer sleeve disposed about the shaft and configured to slide over the distal end of the shaft between a first position and a second position, when the outer sleeve is in the first position, the one or more fingers are unconstrained by the outer sleeve allowing the one or more fingers to receive the spinal fixation element in the slot and engage the spinal fixation element receiving member, when the outer sleeve is in the second position, the one or more fingers are constrained by the outer sleeve securing the spinal fixation element in the slot and the engagement of the spinal fixation element receiving member of the bone anchor by the one or more fingers to permit manipulation of the spinal fixation element and bone anchor by the instrument; and a reduction element configured to pass through the lumen of the shaft and engage the offset spinal fixation element to reduce the offset spinal fixation element into the spinal fixation element receiving member of the bone anchor; and manipulating the first instrument to rotate first bone anchor and the spinal fixation element. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification