Systems and methods for posterior dynamic stabilization of the spine
First Claim
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1. A device for stabilizing at least one spinal motion segment comprising a first vertebra having a first spinous process and a second vertebra having a second spinous process, the device comprising:
- an expandable spacerhaving an undeployed configuration with an undeployed axial dimension, and a deployed configuration having a deployed axial dimension, the undeployed axial dimension is greater than the deployed axial dimension, the expandable spacer including;
a plurality of first deployable segments, at least one of the first deployable segments including a first vertebra receiving feature configured to receive the first vertebra when a longitudinal axis of the expandable spacer extends substantially transversely to a sagittal plane, anda plurality of second deployable segments, at least one of the second deployable segments including a second vertebra receiving feature configured to receive the second vertebra when the longitudinal axis of the expandable spacer extends substantially transversely to the sagittal plane, wherein the first segment with the first vertebra receiving feature and the second segment with the second vertebra receiving feature move away from the longitudinal axis of the expandable spacer such that the first vertebra is moved into the first vertebra receiving feature and the second vertebra is moved into the second vertebra receiving feature when a deployment device is coupled to the expandable spacer and the deployment device moves the expandable spacer from the undeployed configuration to the deployed configuration.
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Abstract
Devices, systems and methods for dynamically stabilizing the spine are provided. The devices include an expandable spacer having an undeployed configuration and a deployed configuration. The spacer has axial and radial dimensions for positioning between the spinous processes of adjacent vertebrae. The systems include one or more spacers and a mechanical actuation device for delivering and deploying the spacer. The methods involve the implantation of one or more spacers within the interspinous space.
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Citations
26 Claims
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1. A device for stabilizing at least one spinal motion segment comprising a first vertebra having a first spinous process and a second vertebra having a second spinous process, the device comprising:
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an expandable spacer having an undeployed configuration with an undeployed axial dimension, and a deployed configuration having a deployed axial dimension, the undeployed axial dimension is greater than the deployed axial dimension, the expandable spacer including; a plurality of first deployable segments, at least one of the first deployable segments including a first vertebra receiving feature configured to receive the first vertebra when a longitudinal axis of the expandable spacer extends substantially transversely to a sagittal plane, and a plurality of second deployable segments, at least one of the second deployable segments including a second vertebra receiving feature configured to receive the second vertebra when the longitudinal axis of the expandable spacer extends substantially transversely to the sagittal plane, wherein the first segment with the first vertebra receiving feature and the second segment with the second vertebra receiving feature move away from the longitudinal axis of the expandable spacer such that the first vertebra is moved into the first vertebra receiving feature and the second vertebra is moved into the second vertebra receiving feature when a deployment device is coupled to the expandable spacer and the deployment device moves the expandable spacer from the undeployed configuration to the deployed configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A device for stabilizing at least one spinal motion segment comprising a first vertebra having a first spinous process and a second vertebra having a second spinous process, the device comprising:
an expandable spacer comprising at least two first segments and at least two second segments, wherein the first segments engage each other such that a force along an axis causes at least one of the first segments having a first U-shaped recess to move in a first direction with a component perpendicular to the axis to receive a first spinous process of the first vertebra within the first U-shaped recess, and the second segments engage each other such that the force causes at least one of the second segments having a second U-shaped recess to move in a second direction with a component perpendicular to the axis to receive a second spinous process of the second vertebra within the second U-shaped recess.
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18. An apparatus for stabilizing at least one spinal motion segment comprising a first vertebra having a first spinous process and a second vertebra having a second spinous process, the apparatus comprising:
an expandable device configured to be coupled to a mechanical actuation device configured to move the expandable device from an undeployed configuration to a deployed configuration, the expandable device including a plurality of segments movable relative to one another such that the segments on opposite sides of the expandable device move outwardly to receive and extend in a superior-inferior direction along opposite sides of a first spinous process of the first vertebra and in the superior-inferior direction along opposite sides of a second spinous process of the second vertebra when the expandable device extends substantially perpendicular to an anterior-to-posterior direction and when the expandable device is positioned between the first vertebra and the second vertebra and moves from the undeployed configuration to the deployed configuration. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
Specification