Stable device for intervertebral distraction and fusion
First Claim
1. A distractible intervertebral body fusion device adapted to be implanted into an intervertebral disc space in a patient'"'"'s body, comprising:
- a first base plate having an outer bearing surface configured to interface with a first vertebra of the intervertebral disc space;
a second base plate having an outer bearing surface configured to interface with a second vertebra of the intervertebral disc space;
a plurality of blocks disposed between the first base plate and the second base plate, each block having an aperture therethrough;
an arm assembly extending between the first base plate and the second base plate on each of a first side and a second side of the base plates, each arm assembly comprising;
a first arm comprising first and second structural members, the first structural member hingedly attached at one end to one of the first base plate and the second base plate and at an opposing end to one of the blocks, and the second structural member hingedly attached at one end to the other of the first base plate and the second base plate and at an opposing end to the one of the blocks to which the first structural member is attached;
a second arm directly adjacent to the first arm and comprising third and fourth structural members, the third structural member hingedly attached at one end to one of the first base plate and the second base plate and at an opposing end to one of the blocks, and the fourth structural member hingedly attached at one end to the other of the first base plate and the second base plate and at an opposing end to the one of the blocks to which the third structural member is attached; and
a third arm linearly displaced from the first arm and the second arm and comprising fifth and sixth structural members, the fifth structural member hingedly attached at one end to one of the first base plate and the second base plate and at an opposing end to one of the blocks, and the sixth structural member hingedly attached at one end to the other of the first base plate and the second base plate and at an opposing end to the one of the blocks to which the fifth structural member is attached; and
first and second actuation members, the first actuation member adapted to extend through the apertures of a plurality of the blocks attached to the first, second and third arms of the arm assembly on the first side of the base plates and the second actuation member adapted to extend through the apertures of a plurality of the blocks attached to the first, second and third arms of the arm assembly on the second side of the base plates, each actuation member independently operable to drive the respective blocks closer together to expand the respective arms to cause the first base plate and the second base plate to move away from each other into a distracted position, andwherein one or more blocks adjacent a common side of the first side and the second side of the base plates are separately driveable with the respective actuation member with respect to the other blocks on the common side such that the corresponding arms on the common side can be expanded by different amounts to position at least one of the first and second base plates in a lorditically angled configuration adapted to match a unique lordosis of a specific patient.
1 Assignment
0 Petitions
Accused Products
Abstract
Improved methods and apparatuses for vertebral body distraction and fusion in accordance with various embodiments employ mechanisms for stabilizing a device so that the device can stay in the body and stably support the disc space during vertebral fusion following distraction of the adjacent vertebra by operation of the device. The device is inserted into the disc space and distracted from a compressed configuration to an expanded configuration to distract the disc space. Mechanisms for stabilizing the device in the expanded configuration constrain the device to zero degrees of freedom of movement to allow the device to stably support the disc space. A bone growth stimulant for promoting vertebral fusion can be inserted into an open space defined by the device, which continues to stably support the disc space during vertebral fusion.
254 Citations
17 Claims
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1. A distractible intervertebral body fusion device adapted to be implanted into an intervertebral disc space in a patient'"'"'s body, comprising:
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a first base plate having an outer bearing surface configured to interface with a first vertebra of the intervertebral disc space; a second base plate having an outer bearing surface configured to interface with a second vertebra of the intervertebral disc space; a plurality of blocks disposed between the first base plate and the second base plate, each block having an aperture therethrough; an arm assembly extending between the first base plate and the second base plate on each of a first side and a second side of the base plates, each arm assembly comprising; a first arm comprising first and second structural members, the first structural member hingedly attached at one end to one of the first base plate and the second base plate and at an opposing end to one of the blocks, and the second structural member hingedly attached at one end to the other of the first base plate and the second base plate and at an opposing end to the one of the blocks to which the first structural member is attached; a second arm directly adjacent to the first arm and comprising third and fourth structural members, the third structural member hingedly attached at one end to one of the first base plate and the second base plate and at an opposing end to one of the blocks, and the fourth structural member hingedly attached at one end to the other of the first base plate and the second base plate and at an opposing end to the one of the blocks to which the third structural member is attached; and a third arm linearly displaced from the first arm and the second arm and comprising fifth and sixth structural members, the fifth structural member hingedly attached at one end to one of the first base plate and the second base plate and at an opposing end to one of the blocks, and the sixth structural member hingedly attached at one end to the other of the first base plate and the second base plate and at an opposing end to the one of the blocks to which the fifth structural member is attached; and first and second actuation members, the first actuation member adapted to extend through the apertures of a plurality of the blocks attached to the first, second and third arms of the arm assembly on the first side of the base plates and the second actuation member adapted to extend through the apertures of a plurality of the blocks attached to the first, second and third arms of the arm assembly on the second side of the base plates, each actuation member independently operable to drive the respective blocks closer together to expand the respective arms to cause the first base plate and the second base plate to move away from each other into a distracted position, and wherein one or more blocks adjacent a common side of the first side and the second side of the base plates are separately driveable with the respective actuation member with respect to the other blocks on the common side such that the corresponding arms on the common side can be expanded by different amounts to position at least one of the first and second base plates in a lorditically angled configuration adapted to match a unique lordosis of a specific patient. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A distractible intervertebral body fusion device adapted to be implanted into an intervertebral disc space in a patient'"'"'s body, comprising:
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a first base plate; a second base plate; a first arm on each of a first side and a second side of the base plates extending between the first base plate and the second base plate, each first arm hingedly attached at one end to the first base plate and at an opposing end to the second base plate; a second arm directly adjacent to the first arm on each of the first side and the second side of the base plates extending between the first base plate and the second base plate, each second arm hingedly attached at one end to the first base plate and at an opposing end to the second base plate; and a third arm linearly displaced from the first arm and the second arm on each of the first side and the second side of the base plates extending between the first base plate and the second base plate, each third arm hingedly attached at one end to the first base plate and at an opposing end to the second base plate; and first and second actuation members extending axially between the first base plate and the second base plate, each actuation member independently rotatable between the first base plate and the second base plate to expand the first, second and third arms on a respective side of the base plates to cause the first base plate and the second base plate to move away from each other into a distracted position, and wherein at least two of the first arm, second arm and third arm on each of the sides of the base plates are separately expandable with respect to each other with the respective actuation member such that the arms can be expanded by different amounts to position at least one of the first and second base plates in a lordotically angled configuration adapted to match a unique lordosis of a specific patient. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A distractible intervertebral body fusion device adapted to be implanted into an intervertebral disc space in a patient'"'"'s body, comprising:
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a first base plate having an outer bearing surface configured to interface with a first vertebra of the intervertebral disc space and first and second sides; a second base plate having an outer bearing surface configured to interface with a second vertebra of the intervertebral disc space and first and second sides; a pair of first arms extending between and hingedly attached to the first base plate and the second base plate, one of the first arms on each of the first and second sides of the base plates; a pair of second arms extending between and hingedly attached to the first base plate and the second base plate, one of the second arms on each of the first and second sides of the base plates, wherein the first pair of arms and second pair of arms are expandable between a collapsed configuration and an expanded configuration in which the first base plate and the second base plate are distracted with respect to each other; a pair of stabilizing arms extending between and hingedly attached to the first base plate and the second base plate, one of the stabilizing arms on each of the first and second sides of the base plates; a pair of actuation members, each actuation member extending adjacent one of the first and second sides of the base plates and independently rotatable to expand the first, second and stabilizing arms along the respective side of the base plates to distract the base plates with respect to each other; and wherein the stabilizing arms are adapted to stably maintain the base plates in the distracted position under in-vivo loads with zero degrees of freedom, and wherein at least two of the first arm, second arm and stabilizing arm on each of the sides of the base plates are separately expandable with respect to each other with the respective actuation member such that the arms can be expanded by different amounts to position at least one of the first and second base plates in a lordotically angled configuration adapted to match a unique lordosis of a specific patient. - View Dependent Claims (15, 16, 17)
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Specification