Expandable fusion cage
First Claim
Patent Images
1. An intervertebral body implant comprising:
- a first shell having an inner surface and an outer surface, and a pin protruding from the outer surface of the first shell; and
a second shell having an inner surface and an outer surface, the inner surface of the second shell having a receiver formed therein;
wherein the first shell and the second shell are coaxially aligned and rotatable from a first open position to a second closed position about the pin;
wherein in the first position, the first shell is received within the second shell, and wherein in the second position, the first shell substantially rotates out of the second shell to form a closed implant, and wherein the pin is located so as to engage the receiver.
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Abstract
This invention relates to an expandable intervertebral fusion cage and a method for its use for spinal fusion that reduces annular, vertebral body and cage damage and that is compatible with anterior, posterior as well as minimally invasive surgical techniques.
66 Citations
18 Claims
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1. An intervertebral body implant comprising:
- a first shell having an inner surface and an outer surface, and a pin protruding from the outer surface of the first shell; and
a second shell having an inner surface and an outer surface, the inner surface of the second shell having a receiver formed therein;
wherein the first shell and the second shell are coaxially aligned and rotatable from a first open position to a second closed position about the pin;
wherein in the first position, the first shell is received within the second shell, and wherein in the second position, the first shell substantially rotates out of the second shell to form a closed implant, and wherein the pin is located so as to engage the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- a first shell having an inner surface and an outer surface, and a pin protruding from the outer surface of the first shell; and
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10. An intervertebral body implant comprising:
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a first shell comprising an outer surface, an inner surface, the inner surface being substantially arcuate, a proximal end extending substantially perpendicularly from the inner surface, and a distal end spaced apart from the proximal end and extending substantially perpendicularly from the inner surface; a second shell comprising a substantially arcuate outer surface shaped to be at least partially received within the inner surface of the first shell; wherein the first shell and the second shell are coaxially aligned and rotatable from a first position to a second position wherein in the first position, the outer surface of the first shell is adjacent the inner surface of the second shell, and wherein in the second position, the first shell substantially rotates out of the second shell to form a substantially closed implant. - View Dependent Claims (11, 12, 13)
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14. An intervertebral body implant comprising:
- a first shell having an inner surface and an outer surface, the outer surface of the first shell having a receiver formed therein, the receiver extending circumferentially;
a second shell having an inner surface and an outer surface, and a rail protruding from the inner surface of the second shell, the rail extending circumferentially;
wherein the first shell and the second shell are coaxially aligned and rotatable from a first position to a second position wherein in the first position, the first shell is substantially received within the second shell, and wherein in the second position, the first shell substantially rotates out of the second shell to form a closed implant; and
wherein rail of the second shell engages the receiver of the first shell over an arc greater than 10 degrees. - View Dependent Claims (15, 16, 17, 18)
- a first shell having an inner surface and an outer surface, the outer surface of the first shell having a receiver formed therein, the receiver extending circumferentially;
Specification