Interspinous spacer
First Claim
1. An implant for placement between a superior spinous process and an inferior spinous process of a curved spine, the implant comprising:
- a body;
a superior arm having superior elongate members spaced apart to receive the superior spinous process therebetween, wherein the superior arm is rotatable relative to the body about a first superior axis to move the superior elongate members in a superior direction such that the superior elongate members move along opposite sides of the superior spinous process while the body is located at an interspinous space between the superior and inferior spinous processes; and
an inferior arm having inferior elongate members spaced apart to receive the inferior spinous process therebetween, wherein the inferior arm is rotatable relative to the body about a first inferior axis to move the inferior elongate members in an inferior direction such that the inferior elongate members move along opposite sides of the inferior spinous process while the body is located at the interspinous space;
wherein the superior arm and/or the inferior arm has an unlocked state for rotating relative to the body in a lateral direction relative to the body to accommodate curvature of the spine and a locked state for preventing rotation relative to the body such that the superior and inferior arms hold the superior and inferior spinous process, respectively, of the curved spine.
1 Assignment
0 Petitions
Accused Products
Abstract
An 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 receiving portion configured for seating a spinous process of a scoliotic spine or a spine with misaligned spinous processes. Each arm has a proximal caming 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, a threaded shaft of the actuator assembly contacts the caming surfaces of 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 superior and inferior arms of the spacer. Variations adapted for scoliotic curves are provided.
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Citations
18 Claims
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1. An implant for placement between a superior spinous process and an inferior spinous process of a curved spine, the implant comprising:
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a body; a superior arm having superior elongate members spaced apart to receive the superior spinous process therebetween, wherein the superior arm is rotatable relative to the body about a first superior axis to move the superior elongate members in a superior direction such that the superior elongate members move along opposite sides of the superior spinous process while the body is located at an interspinous space between the superior and inferior spinous processes; and an inferior arm having inferior elongate members spaced apart to receive the inferior spinous process therebetween, wherein the inferior arm is rotatable relative to the body about a first inferior axis to move the inferior elongate members in an inferior direction such that the inferior elongate members move along opposite sides of the inferior spinous process while the body is located at the interspinous space; wherein the superior arm and/or the inferior arm has an unlocked state for rotating relative to the body in a lateral direction relative to the body to accommodate curvature of the spine and a locked state for preventing rotation relative to the body such that the superior and inferior arms hold the superior and inferior spinous process, respectively, of the curved spine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An implant for placement between a superior spinous process and an inferior spinous process of a curved spine, the implant comprising:
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a main body defining a plane; a first arm and a second arm, wherein the first arm is rotatable relative to the main body about a first axis that lies in a first plane that is substantially perpendicular to the plane, wherein the second arm is rotatable relative to the main body about a second axis that lies in a second plane that is substantially perpendicular to the plane, wherein the first arm is rotatable relative to the main body to move away from the plane to adjust a relative position of the first arm to accommodate curvature of the curved spine; and an actuator configured to be driven by an instrument removably coupled to the implant, wherein the actuator is coupled to the main body and configured to rotate the first and second arms about the respective first and second axes from an undeployed configuration for delivery into an interspinous space between the first and second axes to a deployed configuration for holding the superior and inferior spinous processes. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An implant for placement between a first spinous process and a second spinous process of a curved spine, the implant comprising:
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a main body defining a sagittal plane; a first arm rotatable relative to the main body about a first axis that lies in a first plane substantially perpendicular to the sagittal plane, wherein the first arm has an unlocked state for moving laterally relative to the main body to angle the first arm relative to the sagittal plane to accommodate curvature of the curved spine and a locked state for preventing movement of the first arm laterally relative to the main body; and a second arm rotatable relative to the main body about a second axis that lies in a second plane substantially perpendicular to the sagittal plane and spaced apart from the first axis, wherein the implant is configured to be connected to an instrument operated by a user such that the instrument causes the first and second arms to rotate about the first and second axes, respectively, to position the first spinous process in the first arm and the second spinous process in the second arm when the main body is positioned at an interspinous space. - View Dependent Claims (17, 18)
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Specification