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 undeployed configuration having an axial dimension and a radial dimension substantially transverse to the axial dimension;
a deployed configuration having an axial dimension and a radial dimension substantially transverse to the axial dimension such that the device in the deployed configuration maintains spacing between the first and second spinous processes after the device is implanted;
wherein the radial dimension of the undeployed configuration is less than the radial dimension in the deployed configuration;
a first arm member configured to receive the first spinous process and including a first bridge portion;
a second arm member configured to receive the second spinous process and including a second bridge portion, wherein the first and second arm members are substantially parallel to a long axis of the device when the device is in the undeployed configuration and the long axis extends in an anterior-to-posterior direction relative to the spinal motion segment and when the first and second arm members are located at an interspinous space between the first and second spinous processes, wherein the first and second bridge portions are configured to extend transversely across the first and second spinous processes, respectively, when the first spinous process is located in a U-shape gap defined by the first arm member, the second spinous process is located in a U-shape gap defined by the second arm member, and the long axis of the device extends in the anterior-to-posterior direction relative to the spinal motion segment; and
a body configured to be releasably coupled to a delivery device such that the delivery device is capable of driving components of the body to cause rotation of the first and second arm members relative to the body such that the first and second bridge portions rotate away from the body and toward the first and second spinous processes, respectively, as the device moves from the undeployed configuration toward the deployed configuration when the axial dimension of the undeployed configuration extends in the anterior-to-posterior direction relative to the spinal motion segment.
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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.
539 Citations
34 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 undeployed configuration having an axial dimension and a radial dimension substantially transverse to the axial dimension; a deployed configuration having an axial dimension and a radial dimension substantially transverse to the axial dimension such that the device in the deployed configuration maintains spacing between the first and second spinous processes after the device is implanted;
wherein the radial dimension of the undeployed configuration is less than the radial dimension in the deployed configuration;a first arm member configured to receive the first spinous process and including a first bridge portion; a second arm member configured to receive the second spinous process and including a second bridge portion, wherein the first and second arm members are substantially parallel to a long axis of the device when the device is in the undeployed configuration and the long axis extends in an anterior-to-posterior direction relative to the spinal motion segment and when the first and second arm members are located at an interspinous space between the first and second spinous processes, wherein the first and second bridge portions are configured to extend transversely across the first and second spinous processes, respectively, when the first spinous process is located in a U-shape gap defined by the first arm member, the second spinous process is located in a U-shape gap defined by the second arm member, and the long axis of the device extends in the anterior-to-posterior direction relative to the spinal motion segment; and a body configured to be releasably coupled to a delivery device such that the delivery device is capable of driving components of the body to cause rotation of the first and second arm members relative to the body such that the first and second bridge portions rotate away from the body and toward the first and second spinous processes, respectively, as the device moves from the undeployed configuration toward the deployed configuration when the axial dimension of the undeployed configuration extends in the anterior-to-posterior direction relative to the spinal motion segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for stabilizing a spinal motion segment comprising a first vertebra having a first spinous process and a second vertebra having a second spinous process, the system comprising:
a spacer device having an undeployed configuration for delivery between the first and second spinous processes and a deployed configuration for stabilizing the spinal motion segment after implantation of the spacer device, the spacer device including— a central body having a long axis, a deployable first assembly including a pair of first members, a first arcuate element extending between the first members and configured to receive and hold the first spinous process, and at least one first hinge with a first pin rotatably coupling the first members to the central body such that the first arcuate element moves away from the long axis of the central body to push against the first spinous process when the spacer device moves toward the deployed configuration, the long axis is oriented generally in an anterior-to-posterior direction relative to the spinal motion segment, and ends of the first members move along opposite sides of the first spinous process, and a deployable second assembly including a pair of second members, a second arcuate element extending between the second members and configured to receive and hold the second spinous process, and at least one second hinge with a second pin rotatably coupling the pair of second members to the central body such that the second arcuate element moves away from the long axis of the central body to push against the second spinous process when the spacer device moves toward the deployed configuration, the long axis is oriented generally in the anterior-to-posterior direction relative to the spinal motion segment, and ends of the second members move along opposite sides of the second spinous process. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A system for stabilizing a spinal motion segment comprising a first vertebra having a first spinous process and a second vertebra having a second spinous process, the system comprising:
a spacer device having an undeployed configuration for delivery between the first and second spinous processes and a deployed configuration for stabilizing the spinal motion segment after implantation of the spacer device, the spacer device including— a central body having a long axis, a deployable first assembly including a pair of first members, a first arcuate element extending between the first members and configured to receive and hold the first spinous process, and at least one first hinge rotatably coupling the first members to the central body such that the first arcuate element moves away from the long axis of the central body to push against the first spinous process when the spacer device moves toward the deployed configuration and ends of the first members move along opposite sides of the first spinous process, and a deployable second assembly including a pair of second members, a second arcuate element extending between the second members and configured to receive and hold the second spinous process, and at least one second hinge rotatably coupling the pair of second members to the central body such that the second arcuate element moves away from the long axis of the central body to push against the second spinous process when the spacer device moves toward the deployed configuration and ends of the second members move along opposite sides of the second spinous process; and wherein the first and second members are linkages.
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26. A system for treating a subject'"'"'s spine comprising a first vertebra having a first spinous process and a second vertebra having a second spinous process, the system comprising:
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an implantable spacer device configured to space apart the first and second spinous processes, the implantable spacer device including— a drive assembly configured to be mechanically driven by a delivery instrument releasably coupled to the implantable spacer device, a first assembly hingedly coupled to the drive assembly and configured to receive and hold the first spinous process, the first assembly including a pair of first members having first and second ends, wherein the second ends of the first members move along opposite lateral sides of the first spinous process when the delivery instrument drives the drive assembly to cause rotation of the first ends, and a second assembly hingedly coupled to the drive assembly and configured to receive and hold the second spinous process, the second assembly including a pair of second members having first and second ends, wherein the second ends of the second members move along opposite lateral sides of the second spinous process when the delivery instrument drives the drive assembly to cause rotation of the first ends of the second members. - View Dependent Claims (27, 28, 29, 30, 31)
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32. A system for treating a subject'"'"'s spine comprising a first vertebra having a first spinous process and a second vertebra having a second spinous process, the system comprising:
an implantable spacer device configured to space apart the first and second spinous processes, the implantable spacer device including— a first assembly configured to receive the first spinous process; a second assembly configured to receive the second spinous process; and a drive assembly being configured to be releasably coupled to a delivery instrument, wherein the drive assembly includes a central body with a long axis and is rotatably coupled to the first and second assemblies such that the first assembly is generally parallel to the long axis when the first assembly is in an undeployed configuration and generally perpendicular to the long axis when the first assembly is in a deployed configuration, and wherein the second assembly is generally parallel to the long axis when the second assembly is in an undeployed configuration and generally perpendicular to the long axis when the second assembly is in a deployed configuration. - View Dependent Claims (33, 34)
Specification