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 axial translation device having a proximal section, a distal section, and a longitudinal axis between the proximal section and the distal section, wherein the axial translation device is configured to translate at least one of the proximal section and the distal section along the longitudinal axis from an undeployed position in which the proximal and distal sections are spaced apart from each other by a first axial distance to a deployed position in which the proximal and distal sections are spaced apart from each other by a second axial distance less than the first axial distance; and
a spacer body coupled to the axial translation device and having a segment configured to engaged the first and second spinous processes wherein the segment has a proximal edge facing the proximal section of the axial translation device and a distal edge facing toward the distal section of the axial translation device, and wherein the proximal and distal edges of the segment are inclined reciprocally such that they diverge from each other with increasing radial distance from the longitudinal axis, the body being further configured to have an undeployed configuration in which the segment is at a first radial position when the axial translation device is in the undeployed position and a deployed configuration in which the segment is at a second radial position when the axial translation device is in the deployed position, and wherein the second radial position is further from the longitudinal axis than the first radial position.
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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, wherein 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 means for delivering and deploying the spacer. The methods involve the implantation of one or more spacers within the interspinous space.
325 Citations
18 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 axial translation device having a proximal section, a distal section, and a longitudinal axis between the proximal section and the distal section, wherein the axial translation device is configured to translate at least one of the proximal section and the distal section along the longitudinal axis from an undeployed position in which the proximal and distal sections are spaced apart from each other by a first axial distance to a deployed position in which the proximal and distal sections are spaced apart from each other by a second axial distance less than the first axial distance; and a spacer body coupled to the axial translation device and having a segment configured to engaged the first and second spinous processes wherein the segment has a proximal edge facing the proximal section of the axial translation device and a distal edge facing toward the distal section of the axial translation device, and wherein the proximal and distal edges of the segment are inclined reciprocally such that they diverge from each other with increasing radial distance from the longitudinal axis, the body being further configured to have an undeployed configuration in which the segment is at a first radial position when the axial translation device is in the undeployed position and a deployed configuration in which the segment is at a second radial position when the axial translation device is in the deployed position, and wherein the second radial position is further from the longitudinal axis than the first radial position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. 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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a body comprising at least two segments that engage each other along surfaces inclined at alternate interior angles such that a force along an axis that drives one or both of the segments toward the other causes one or both of the segments to move in a direction with a component perpendicular to the axis; Such that the body has an undeployed configuration with an axial dimension and a radial dimension substantially transverse to the axial dimension, and a deployed configuration having an axial dimension and a radial dimension substantially transverse to the axial dimension; wherein the radial dimension of at least a portion of the body in the undeployed configuration is less than the radial dimension of at least a portion of the body in the deployed configuration.
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Specification