Osteogenic fusion device
First Claim
1. An implant system for promoting fusion bone growth in the space between adjacent vertebrae, comprising:
- at least first and second load bearing members adapted to be bilaterally placed between adjacent vertebrae, said load bearing members includingopposite end pieces and an elongated central element extending between said end pieces, said opposite end pieces having two opposite surfaces configured to contact and support the adjacent vertebrae,said central element being sized smaller relative to said opposite end pieces to define a pocket between said central element and the adjacent vertebrae when the adjacent vertebrae are supported by said opposite end pieces, said pocket configured to contain an osteogenic material disposed about said central element and in intimate contact with the adjacent vertebrae when the vertebrae are supported by said opposite end pieces, andat least said first load bearing member including at least one opposite end piece having a truncated surface that defines a cutout region; and
wherein at least one of said opposite end pieces of said second load bearing member is nested within said cutout region.
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Abstract
An interbody osteogenic fusion device is provided that includes opposite end pieces with an integral central element. The end pieces are sized to maintain the height of an intervertebral disc space. The central element has a much smaller diameter so that the osteogenic fusion device forms an annular pocke around the central element. An osteogenic material is disposed within the annular pocket between the opposite end pieces. In one embodiment,the osteogenic material constitutes a collagen sheet soaked in asolution containing a bone morphogenetic protein. The osteogenic fusion device is configured so that the osteogenic material is in direct contact with the adjacent vertebral bone. In addition to the enhanced area of contact between the vertebral bone and the fusion material, the inventive osteogenic fusion device reduces stress-shielding and minimizes the radiopacity of the implant so that growth of the fusion mass can be continuously assessed. In yet another embodiment, the osteogenic fusion device includes at least one end piece with a truncated surface. The osteogenic fusion devices of the present invention may be combined with other fusion devices to form an implant system. The implant system includes at least one load bearing member having a truncated surface configured to nest within another load bearing member, preferably the load bearing, osteogenic fusion device of the present invention. The invention also provides implant systems comprising adjacent load bearing members connected to one another to resist lateral separation. Methods of promoting fusion bone growth in the space between adjacent vertebrae utilizing devices and systems of the invention are also described.
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Citations
51 Claims
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1. An implant system for promoting fusion bone growth in the space between adjacent vertebrae, comprising:
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at least first and second load bearing members adapted to be bilaterally placed between adjacent vertebrae, said load bearing members including opposite end pieces and an elongated central element extending between said end pieces, said opposite end pieces having two opposite surfaces configured to contact and support the adjacent vertebrae, said central element being sized smaller relative to said opposite end pieces to define a pocket between said central element and the adjacent vertebrae when the adjacent vertebrae are supported by said opposite end pieces, said pocket configured to contain an osteogenic material disposed about said central element and in intimate contact with the adjacent vertebrae when the vertebrae are supported by said opposite end pieces, and at least said first load bearing member including at least one opposite end piece having a truncated surface that defines a cutout region; and wherein at least one of said opposite end pieces of said second load bearing member is nested within said cutout region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of promoting fusion bone growth in the space between adjacent vertebrae, said method comprising:
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(a) providing an implant system including first and second load bearing members adapted to be bilaterally placed between adjacent vertebrae, said load bearing members including; opposite end pieces and an elongated central element extending between said end pieces, said opposite end pieces having two opposite surfaces configured to contact and support the adjacent vertebrae, said central element being sized relative to said opposite end pieces to define a pocket between said central element and the adjacent vertebrae when the adjacent vertebrae are supported by said opposite end pieces, said pocket configured to contain an osteogenic material disposed about said central element and in intimate contact with the adjacent vertebrae when the vertebrae are supported by said opposite end pieces, at least said first load bearing member including at least one opposite end piece having a truncated surface configured to nest within said second load bearing member; a bone growth inductive material disposed around said central body and in intimate contact with the adjacent vertebrae when said central body is within the space between adjacent vertebrae; (b) preparing said adjacent vertebrae to receive said implant in an intervertebral space between adjacent vertebrae; and (c) placing said implant system into the intervertebral space after said preparing step, wherein said placing includes engaging one of the opposite end pieces of said second load bearing member with said truncated surface of said second load bearing member to nest said first load bearing member with said second load bearing member.
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16. An implant system for promoting fusion bone growth in a space between adjacent vertebrae, comprising:
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a first osteogenic fusion device including a first end piece, a second end piece, and a central element, said central element of said first fusion device extending between said first end piece of said first fusion device and said second end piece of said first fusion device, said central element of said first fusion device having an outer diameter;
wherein said first and second end piece of said first fusion device each have an outer diameter that is greater than said outer diameter of said central element of said first fusion device to minimize stress shielding along said central element of said first fusion device;a second osteogenic fusion device including a first end piece, a second end piece, and a central element, said central element of said second fusion device extending between said first end piece of said second fusion device and said second end piece of said second fusion device; and wherein said first end piece of said first fusion device has a cutout region defined by a truncated surface, said first end piece of said second fusion device being received in said cutout region of said first end piece of said first fusion device to nest said first fusion device with said second fusion device. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. An implant system for promoting fusion bone growth in the space between adjacent vertebrae including at least first and second load bearing members adapted to be bilaterally placed between adjacent vertebrae, said load bearing members comprising:
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opposite end pieces and an elongated central element extending between said end pieces, said opposite end pieces having two opposite surfaces configured to contact and support the adjacent vertebrae; said central element being sized smaller relative to said opposite end pieces to define a pocket between said central element and the adjacent vertebrae when the adjacent vertebrae are supported by said opposite end pieces, said pocket configured to contain an osteogenic material disposed about said central element and in intimate contact with the adjacent vertebrae when the vertebrae are supported by said opposite end pieces; at least said first load bearing member including at least one opposite end piece having a truncated surface configured to nest within said second load bearing member; an osteogenic material contained within each of said pocket of each of said load bearing members and arranged to contact the adjacent vertebrae when the vertebrae are supported by said opposite end pieces; wherein said osteogenic material includes an osteogenic substance disposed within a carrier; and wherein said carrier is a collagen sheet wound around said central elements within each of said pocket of said load bearing members.
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28. An implant system for promoting fusion bone growth in a space between adjacent vertebrae, comprising:
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first and second fusion devices, each of said devices including opposite end pieces and an elongated central element extending between said end pieces, said opposite end pieces having two opposite surfaces configured to contact and support the adjacent vertebrae, said central element being sized smaller relative to said opposite end pieces to define a pocket between said central element and the adjacent vertebrae when the adjacent vertebrae are supported by said opposite end pieces, said pocket configured to contain an osteogenic material disposed about said central element and in intimate contact with the adjacent vertebrae when the vertebrae are supported by said opposite end pieces; wherein at least one of the opposing end pieces of the first fusion device defines a cutout region that is concave in shape and at least one of the opposing end pieces of the second fusion device is received in the cutout region to nest the second fusion device with the first fusion device. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. An implant system for promoting fusion bone growth between vertebrae, comprising:
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a first load bearing member including a first end piece, a second end piece and a central element that connects the first end piece of the first load bearing member to the second end piece of the first load bearing member, the central element being sized smaller relative to said opposite end pieces to define a pocket between said central element and the adjacent vertebrae when the adjacent vertebrae are supported by said opposite end pieces, said pocket configured to contain an osteogenic material disposed about said central element and in intimate contact with the adjacent vertebrae when the vertebrae are supported by said opposite end pieces; a second load bearing member including a first end piece, a second end piece and a central element that connects the first end piece of the second load bearing member to the second end piece of the second load bearing member; and wherein the first end piece of the first load bearing member has a truncated surface that defines a cutout region, and the first end piece of the second load bearing member is nested within said cutout region. - View Dependent Claims (42, 43, 44)
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45. A method, comprising:
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providing first and second fusion devices, each of said devices including opposite end pieces and an elongated central element extending between said end pieces, said opposite end pieces having two opposite surfaces configured to contact and support the adjacent vertebrae, said central element being sized smaller relative to said opposite end pieces to define a pocket between said central element and the adjacent vertebrae when the adjacent vertebrae are supported by said opposite end pieces, said pocket configured to contain an osteogenic material disposed about said central element and in intimate contact with the adjacent vertebrae when the vertebrae are supported by said opposite end pieces; forming a surgical window into a disc space between adjacent vertebrae; implanting the first fusion device between the vertebrae by inserting the first fusion device through the surgical window, wherein at least one of the opposing end pieces of the first fusion device has a cutout region; implanting the second fusion device between the vertebrae by inserting the second fusion device through the surgical window; and nesting the second fusion device with the first fusion device within the surgical window by positioning at least a portion of one the end pieces of the second fusion device in the cutout region of the first fusion device. - View Dependent Claims (46, 47, 48, 49)
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50. An implant system for promoting fusion bone growth in the space between adjacent vertebrae, comprising:
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at least first and second load bearing members adapted to be bilaterally placed between adjacent vertebrae, said load bearing members including opposite end pieces and an elongated central element extending between said end pieces, said opposite end pieces having two opposite surfaces configured to contact and support the adjacent vertebrae, said central element being sized smaller relative to said opposite end pieces to define a pocket between said central element and the adjacent vertebrae when the adjacent vertebrae are supported by said opposite end pieces, said pocket configured to contain an osteogenic material disposed about said central element and in intimate contact with the adjacent vertebrae when the vertebrae are supported by said opposite end pieces, at least said first load bearing member including at least one opposite end piece having a truncated surface; and an osteogenic material contained within each of said pocket of each of said load bearing members and arranged to contact the adjacent vertebrae when the vertebrae are supported by said opposite end pieces; wherein said osteogenic material includes an osteogenic substance disposed within a carrier; wherein said carrier is a collagen sheet wound around said central elements within each of said pocket of said load bearing members; and wherein at least one of said opposite end pieces of said second load bearing member contacts said truncated surface of said first load bearing member to nest the first and second load bearing members together.
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51. An implant system for promoting fusion bone growth in a space between adjacent vertebrae, comprising:
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a first fusion device being dumbbell shaped, the first fusion device including a central element that connects opposing end pieces; a second fusion device being a dumbbell shaped, the second fusion device including a central element that connects opposing end pieces; and wherein at least one of the opposing end pieces of the first fusion device defines a cutout region that is concave in shape and at least one of the opposing end pieces of the second fusion device is received in the cutout region to nest the second fusion device with the first fusion device; wherein both the opposing end pieces of the first fusion device each have the cutout region that is concave in shape; wherein both the opposing end pieces of the second fusion device are nested within respective ones of the opposing end pieces of the first fusion device; and wherein at least one of the opposing end pieces of the second fusion device defines a cutout region that is concave in shape.
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Specification