A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 17/72 (2006.01) A61B 17/80 (2006.01) A61F 2/30 (2006.01) A61B 17/00 (2006.01) A61B 17/66 (2006.01) A61F 2/00 (2006.01) A61F 2/36 (2006.01) A61F 2/48 (2006.01)
Patent
CA 2156291
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 (4) having distal (6) and proximal (8) portions both of which are secured with the medullar canal of the bone. A hydraulic cylinder (2) comprises the proximal portion of the nail and a piston (9) comprises the distalportion of the nail. An implantable supply of operating fluid (30) communicates with the cylinder. A ratcheting (40), between the piston and cylinder, limits their relative movement. A shock absorber mechanism (52) permits limited lost motion between the piston and cylinder and ratcheting release mechanisms are employed to permit the piston and cylinder to reverse directions.
Borden Ladner Gervais Llp
Genesis Orthopedics
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