The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 27, 1994
Filed:
Feb. 18, 1993
Alan R Spievack, Watertown, MA (US);
Genesis Orthopedics, Cambridge, MA (US);
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.