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:
Oct. 09, 2012
Filed:
Aug. 02, 2006
William Mackenzi, Montchanin, DE (US);
Tariq Rahman, Moylan, PA (US);
Robert Akins, Newark, DE (US);
Alastair Younger, Vancouver, CA;
William Mackenzi, Montchanin, DE (US);
Tariq Rahman, Moylan, PA (US);
Robert Akins, Newark, DE (US);
Alastair Younger, Vancouver, CA;
The Nemours Foundation, Jacksonville, FL (US);
Abstract
Force-controlled autodistraction for lengthening a bone is disclosed. A distractor is coupled to first and second fixators that are coupled to first and second portions of the bone, respectively, on opposite sides of an osteotomy of the bone. A motor produces a motion of the first fixator relative to the second fixator such that the first portion of the bone is distracted from the second portion of the bone. A force sensor measures a resistant force to the motion, and a distractor displacement sensor measures a distractor displacement. A controller is operably coupled to the force sensor, the distractor displacement sensor, and the motor. The controller is configured to determine a variable limb stiffness using the resistant force, the distractor displacement, and a known distractor stiffness of the distractor, and to adjust a gain of the motor such that the variable limb stiffness matches a desired limb stiffness.