Adjustable and fixed assembled bone-tendon-bone graft

A - Human Necessities – 61 – F

Patent

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Details

A61F 2/08 (2006.01) A61F 2/28 (2006.01)

Patent

CA 2600040

The present invention has multiple aspects. In its simplest aspect, the present invention is directed to an intermediate bone block comprising a machined segment of cortical bone, cancellous bone or both, the intermediate having a face comprising one to ten compression surfaces and one to ten cavities, the compression surfaces suitable for compressing soft tissue, the cavities for receiving and holding overflow soft tissue. The cavities are preferably channels, and more preferably channels having an omega cross- sectional profile. Surprisingly, the cavities and channels, which reduced the compressed surface area between the intermediate bone block and the tendon, significantly improved tendon load at failure. In standardized tests, an intermediate bone block of this invention, when combined with high surface area bone blocks of the prior art bone blocks, unexpectedly increased their load at failure. The invention is also directed to bone block assemblies suitable for binding to a soft tissue to form an implantable graft, and to such implantable grafts. A particularly preferred graft is a bone-tendon-bone graft.

L'invention se présente sous plusieurs aspects. Dans son aspect le plus simple, l'invention se présente sous forme d'un bloc osseux intermédiaire qui comprend un segment usiné d'os cortical et/ou d'os spongieux, la partie intermédiaire présentant une face qui comprend une à dix surfaces de compression et une à dix cavités, lesdites surfaces de compression étant conçues pour comprimer des tissus mous, et lesdites cavités étant conçues pour recevoir et retenir des tissus mous en débordement. Les cavités se présentent de préférence sous forme de canaux, et idéalement de canaux présentant un profil de section transversale oméga. Etonnamment, les cavités et les canaux, qui réduisent la surface comprimée entre le bloc osseux intermédiaire et le tendon, augmentent de manière significative la contrainte à la rupture du tendon. Des tests standardisés ont montré qu'un bloc osseux intermédiaire de l'invention, combiné à des blocs osseux de grande superficie de l'art antérieur, faisait augmenter de manière inattendue la contrainte à la rupture desdits blocs. L'invention concerne également des ensembles bloc osseux conçus pour se lier à des tissus mous afin que soit formé un greffon implantable, et lesdits greffons implantables. Un greffon particulièrement préféré de l'invention est un greffon os-tendon-os.

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