Bone and tissue lengthening device

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/72 (2006.01) A61B 17/00 (2006.01) A61F 2/00 (2006.01) A61F 2/30 (2006.01) A61F 2/48 (2006.01)

Patent

CA 2184006

A device for lengthening bone in a human or animal by incrementally extending the distance between discrete separated portions of the bone to permit continued bone growth between the separated portions comprising an intramedullary nail having distal and proximal portions both of which are secured within the medullar canal of the bone. A hydraulic cylinder is connected to the proximal portion and a piston is connected to the distal portion of the nail. An implantable supply of operating fluid communicates with the cylinder and ratcheting mechanism, between the piston and cylinder, limit their relative movement. A shock absorber mechanism permits limited lost motion between the piston and cylinder and ratcheting release means are employed to permit the piston and cylinder to reverse directions. Various interchangeable distal tips are disclosed to accommodate not only different bones but differently shaped medullar canals.

Dispositif d'allongement d'un os humain ou animal par accroissement de la distance entre deux de ses portions séparées pour permettre une croissance continue de l'os entre lesdites portions. Ce dispositif consiste en un clou intramédullaire présentant une extrémité distale et une extrémité proximale et fixé à l'intérieur du canal médullaire de l'os. Un vérin hydraulique est relié à l'extrémité proximale du clou, et un piston, à son extrémité distale. Une source implantable d'un fluide de travail communique avec le vérin et un mécanisme à cliquet placé entre le piston et le vérin en limite les mouvements relatifs. Un mécanisme amortisseur permet un jeu limité entre le piston et le vérin, tandis que le mécanisme à cliquet permet d'inverser les sens de déplacement du piston et du vérin. Différentes têtes distales sont présentées pouvant s'adapter non seulement à des os, mais à des canaux médullaires différents.

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