Interspinous spacer
First Claim
1. An implantable spacer for placement between adjacent interspinous processes in a spinal motion segment comprising:
- a body defining a longitudinal passageway and a longitudinal axis;
a first arm and a second arm connected to the body and capable of rotation with respect to the body;
each arm having a pair of extensions spaced apart from one another to define an opening between the extensions, the opening being configured to receive a spinous process;
each arm having a proximal camming surface;
an actuator assembly connected to the body;
the actuator assembly comprising an actuator having a proximal end and a distal end;
the actuator having at least one bearing surface at the distal end configured to engage each camming surface;
the actuator is connected to the body and configured to move inside the longitudinal passageway relative to the body to contact each camming surface with the at least one bearing surface and thereby move the arms from an undeployed configuration in which the arms are substantially parallel to the longitudinal axis of the body to a deployed configuration in which the arms are substantially perpendicular to the longitudinal axis of the body to contain adjacent spinous processes in each arm when in the deployed configuration.
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Accused Products
Abstract
A novel implantable spacer for placement between adjacent spinous processes in a spinal motion segment is provided. The spacer includes a body defining a longitudinal passageway. A first arm and a second arm are connected to the body. Each arm has a pair of extensions and a saddle defining a U-shaped configuration for seating a spinous process therein. Each arm has a proximal camming surface and is capable of rotation with respect to the body. An actuator assembly is disposed inside the longitudinal passageway and connected to the body. When advanced, the actuator assembly contacts the camming surfaces of the arms to rotate them from an undeployed configuration to a deployed configuration. In the deployed configuration, the distracted adjacent spinous processes are seated in the U-shaped portion of the arms providing sufficient distraction to open the neural foramen to relieve pain. An insertion instrument is provided for implanting the interspinous process spacer. The system is configured for quick implantation through a small percutaneous incision employing minimally invasive techniques.
503 Citations
29 Claims
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1. An implantable spacer for placement between adjacent interspinous processes in a spinal motion segment comprising:
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a body defining a longitudinal passageway and a longitudinal axis; a first arm and a second arm connected to the body and capable of rotation with respect to the body;
each arm having a pair of extensions spaced apart from one another to define an opening between the extensions, the opening being configured to receive a spinous process;
each arm having a proximal camming surface;an actuator assembly connected to the body;
the actuator assembly comprising an actuator having a proximal end and a distal end;
the actuator having at least one bearing surface at the distal end configured to engage each camming surface;
the actuator is connected to the body and configured to move inside the longitudinal passageway relative to the body to contact each camming surface with the at least one bearing surface and thereby move the arms from an undeployed configuration in which the arms are substantially parallel to the longitudinal axis of the body to a deployed configuration in which the arms are substantially perpendicular to the longitudinal axis of the body to contain adjacent spinous processes in each arm when in 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. An implantable spacer for placement between adjacent interspinous processes in a spinal motion segment comprising:
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a body defining a longitudinal passageway and a longitudinal axis; a first arm and a second arm connected to the body and capable of rotation with respect to the body;
each arm having a pair of extensions and configured for containing a spinous process therein;
each arm having a proximal camming surface;an actuator assembly connected to the body;
the actuator assembly comprising an actuator having a proximal end and a distal end;
the actuator having at least one bearing surface at the distal end configured to engage each camming surface;
the actuator is connected to the body and configured to move inside the longitudinal passageway relative to the body to contact each camming surface with the at least one bearing surface and thereby move the arms from an undeployed configuration in which the arms are substantially parallel to the longitudinal axis of the body to a deployed configuration in which the arms are substantially perpendicular to the longitudinal axis of the body to contain adjacent spinous processes in each arm when in the deployed configuration, wherein the actuator includes an elongate slot and the actuator is connected to the body with a pin passed through the slot and connected to the body such that the actuator is configured to move longitudinally with respect to the body. - View Dependent Claims (18)
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19. An implantable spacer for placement between adjacent interspinous processes in a spinal motion segment, comprising:
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a body having a proximal portion, a distal portion and a posterior-anterior dimension between the proximal and distal portions; a first arm having a pair of first extensions, a first cross-member between the first extensions, and a first proximal camming surface, wherein the first extensions are spaced apart from one another to define a first opening between the first extensions, the first opening being configured to receive a first spinous process; a second arm having a pair of second extensions, a second cross-member between the second extensions, and a second proximal camming surface, wherein the second extensions are spaced apart from one another to define a second opening between the second extensions, the second opening being configured to receive a second spinous process; a hinge assembly rotatably coupling the first and second arms to the distal portion of the body, wherein the hinge assembly has at least a first pin extending transverse to the posterior-anterior dimension to define a first rotation axis about which the first arm can rotate; and an actuator assembly coupled to the body to move along the posterior-anterior dimension, the actuator assembly having an actuator including a proximal end, a distal end, a first bearing surface at the distal end, and a second bearing surface at the distal end, wherein the first bearing surface is configured to contact the first camming surface of the first arm and the second bearing surface is configured to contact the second camming surface of the second arm as the actuator moves distally thereby causing the first arm to rotate about the first rotation axis from an undeployed configuration to a deployed configuration. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. An implantable interspinous spacer, comprising:
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a body defining a longitudinal passageway and a longitudinal axis; a first arm coupled to the body and rotatable relative to the body, the first arm including a pair of first extension members spaced apart to define a first opening configured to receive a superior spinous process such that the superior spinous process extends in a posterior-anterior direction through the first opening when the first extension members are positioned on opposing laterals sides of the superior spinous process; a second arm coupled to the body and rotatable relative to the body, the second arm including a pair of second extension members spaced apart to define a second opening configured to receive an inferior spinous process such that the inferior spinous process extends in the posterior-anterior direction through the second opening when the second extension members are positioned on opposing laterals sides of the inferior spinous process; and an actuator assembly connected to the body, the actuator assembly comprising an actuator having a proximal end and a distal end, the actuator having at least one bearing surface at the distal end configured to engage each camming surface, the actuator being connected to the body and configured to move inside the longitudinal passageway relative to the body to contact each camming surface with the at least one bearing surface to move the first and second arms from an undeployed configuration in which the arms are substantially parallel to the longitudinal axis of the body to a deployed configuration in which the first and second arms are substantially perpendicular to the longitudinal axis of the body. - View Dependent Claims (27, 28, 29)
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Specification