Distractor for use in spinal surgery
First Claim
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1. A distractor, comprising:
- a distraction head having a longitudinal axis and a first pair of opposed surfaces extending substantially along said longitudinal axis and defining a first working distraction height approximating a normal disc space height and a second pair of opposed surfaces extending substantially along said longitudinal axis and defining a second working distraction height approximating a second normal disc space height, said distraction head rotatable between said first distraction height and said second distraction height by rotating the distraction head about said longitudinal axis.
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Abstract
Apparatus and a method of inserting spinal implants is disclosed in which an intervertebral space is first distracted, a hollow sleeve having teeth at one end is then driven into the vertebrae adjacent that disc space. A drill is then passed through the hollow sleeve removing disc and bone in preparation for receiving the spinal implant which is then inserted through the sleeve.
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Citations
40 Claims
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1. A distractor, comprising:
- a distraction head having a longitudinal axis and a first pair of opposed surfaces extending substantially along said longitudinal axis and defining a first working distraction height approximating a normal disc space height and a second pair of opposed surfaces extending substantially along said longitudinal axis and defining a second working distraction height approximating a second normal disc space height, said distraction head rotatable between said first distraction height and said second distraction height by rotating the distraction head about said longitudinal axis.
- View Dependent Claims (2, 3, 4, 5, 6)
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7. A spinal distractor for use in spinal surgery for temporarily positioning two adjacent vertebral bodies in selected relationship to restore the height of the disc space therebetween prior to inserting an implant into the distracted disc space, said spinal distractor comprising:
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a body having a proximal end, a distal end opposite said proximal end, and a mid-longitudinal axis therebetween; and
an extension extending from said distal end of said body and configured to contact the adjacent vertebral bodies upon insertion into the disc space between the two adjacent vertebral bodies, said extension being removably attached to said body, said extension being adapted to bear against adjacent endplates of the two adjacent vertebral bodies, said extension having a first portion for bearing against one of the adjacent endplates and a second portion for bearing against the other of the adjacent endplates to maintain the adjacent vertebral bodies in selected relationship, said extension having a height no greater than the surgically corrected height of the disc space, said distal end of said body being configured to prevent said body from entering the disc space between the endplates of the adjacent vertebral bodies when said extension is inserted into the disc space. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A distraction device for distracting the disc space between adjacent vertebrae, comprising:
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an elongated stem having a height corresponding to a desired height of distraction for the disc space, said stem having a first end and a second end defining a longitudinal axis therebetween and a length along said axis that is sized to be maintained within the disc space when said elongated stem is driven into the disc space; and
a flange at said first end projecting outward from said longitudinal axis of said stem, said flange having a bone contacting face for contacting at least one of the vertebrae when said stem is driven into the disc space and for transmitting a reduction force to the vertebra upon application of an external force to the distraction device.
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33. A distraction member for distracting a disc space between adjacent vertebral bodies, comprising:
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a distraction tip adapted for insertion between the adjacent vertebral bodies to distract the disc space; and
at least one fin secured to said distraction tip, at least a portion of the at least one fin extending transversely from said distraction tip and adapted to engage a corresponding one of the adjacent vertebral bodies.
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34. A distraction member for distracting a disc space between adjacent vertebral bodies, comprising:
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a distraction tip adapted for insertion between the adjacent vertebral bodies to distract the disc space, said distraction tip having a tapered distal portion; and
at least one fin, at least a portion of the fin extending transversely from said distraction tip and adapted to engage a corresponding one of the adjacent vertebral bodies.
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35. A distraction member for distracting a disc space between adjacent vertebral bodies, comprising:
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a distraction tip adapted for insertion between the adjacent vertebral bodies to distract the disc space;
a hub extending axially from said distraction tip, a portion of said hub extending transversely beyond said distraction tip to form a shoulder; and
at least one fin, at least a portion of the fin extending transversely from said distraction tip and adapted to engage a corresponding one of the adjacent vertebral bodies.
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36. A method for establishing a disc space height between two adjacent vertebral bodies, comprising:
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providing a distraction member having a distraction tip and at least one longitudinally extending fin secured to said tip;
positioning the tip against the adjacent vertebral bodies; and
advancing the distraction tip between the adjacent vertebral bodies to restore the disc space height, the fin in intimate engagement with at least one of the adjacent vertebral bodies. - View Dependent Claims (37)
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38. A method for distracting a disc space between two adjacent vertebral bodies, comprising:
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providing a distraction member having a distraction tip sized for insertion within the disc space and at least one longitudinally extending fin secured to the distraction tip;
inserting the distraction tip between the adjacent vertebral bodies; and
engaging the fin with a corresponding one of the adjacent vertebral bodies. - View Dependent Claims (39, 40)
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Specification