Ceramic fusion implants and compositions containing...

A - Human Necessities – 61 – L

Patent

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A61L 27/54 (2006.01) A61F 2/44 (2006.01) A61L 27/12 (2006.01) A61L 27/42 (2006.01) A61L 27/56 (2006.01)

Patent

CA 2269254

Bone graft substitute compositions are provided for promoting new bone growth and arthrodesis. The compositions include a carrier for controlled delivery of osteoinductive factors. In one embodiment, the carriers include a biphasic calcium phosphate ceramic having between about 2-40 % hydroxyapatite and about 98-60 % tricalcium phosphate by volume, and a calcium/phosphorous ratio of between about 1.50 to about 1.60. The invention also includes osteoinductive compositions including the carriers and an effective amount of a bone morphogenetic protein dispersed within the ceramic. The composition has a weight ratio of protein to ceramic of no more than about 1:200. In a specific embodiment, the weight ratio of protein to ceramic is between about 1:200 and about 1:2000. Spinal implants (10) are also provided which include a body (11) having a wall (12) sized for engagement within a space (S) between adjacent vertebrae (V) to maintain the space (S) and a confining matrix (13) for confining new bone growth to the body (11).

L'invention concerne des compositions de substitution pour greffe osseuse destinées à stimuler une nouvelle croissance osseuse et pour l'arthrodèse. Les compositions comprennent un excipient en vue de l'administration régulée de facteurs ostéoinductifs. Dans un mode de réalisation, les excipients comportent une céramique de phosphate de calcium diphasique renfermant en volume entre environ 2 et 40 % d'hydroxyapathite et environ 98 à 60 % de phosphate tricalcique, ainsi qu'un rapport calcium/phosphore compris entre environ 1,50 et environ 1,60. L'invention concerne également des compositions ostéoinductives comportant ces excipients et une quantité efficace d'une protéine morphogénétique osseuse dispersée à l'intérieur de la céramique. La composition présente un rapport pondéral protéine-céramique ne dépassant pas environ 1:200. Dans un mode de réalisation spécifique, le rapport pondéral protéine-céramique est compris entre environ 1:200 et environ 1:2000. L'invention concerne encore des implants spinaux (10) comprenant un corps (11) présentant une paroi (12) dimensionnée de manière à pouvoir être introduite dans un espace (S) situé entre des vertèbres (V) adjacentes afin de maintenir l'espace (S), et une matrice (13) de confinement destinée à limiter la nouvelle croissance osseuse au volume du corps (11).

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