Bone and tissue lengthening device
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United States of America Patent
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-
Sep 27, 1994
Grant Date -
N/A
app pub date -
Feb 18, 1993
filing date -
Feb 18, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device for lengthening bone in an 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 with the medullar canal of the bone. A hydraulic cylinder comprises the proximal portion of the nail and a piston comprises the distal portion of the nail. An implantable supply of operating fluid communicates with the cylinder. A ratcheting mechanism, between the piston and cylinder, limits their relative movement. A shock absorber mechanism permits limited lost motion between the piston and cylinder and ratcheting release mechanisms are employed to permit the piston and cylinder to reverse directions.
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