Orthosoft, Inc.

Éric Brosseau

Herbert André Jansen

Louis-Philippe Amiot

Alain Richard

Sébastien Jutras

Gabriel Coté

There is described a method for determining a mechanical axis of a femur using a computer aided surgery system having an output device for displaying said mechanical axis, the method comprising: providing a position sensing system having a tracking device capable of registering instantaneous position readings and attaching the tracking device to the femur; locating a center of a femoral head of the femur by moving a proximal end of the femur to a first static position, acquiring a fixed reading of the first static position, repeating the moving and the acquiring for a plurality of static positions; and locating the centre by determining a central point of a pattern formed by the plurality of static positions; digitizing an entrance point of the mechanical axis at a substantially central position of the proximal end of the femur; and joining a line between the entrance point and the center of rotation to form the mechanical axis.

Method for locating the mechanical axis of a femur

A system for automatic calibration of instruments (S) having varying cross-sectional dimensions within a predetermined range and having detectable elements () thereon for computer-aided surgery, comprising a calibration base (C) having detectable elements () secured thereto for detecting a position and an orientation thereof in space by sensors () connected to a position calculator (). The calibration base is adapted to receive and to releasably secure a working shaft () of any of the instruments (S) and provides an abutting surface () for a tip () thereof in such a way that a position and orientation of the tip () of the instrument (S) secured therein is calculable when working shaft cross-section dimensions thereof are known. The position calculator () receives instrument data () and calibration data () from an operator through a user interface () and stores the instrument data () and calibration data () for subsequent calibrations.

Growing community of inventors

Montréal, Canada

Éric Brosseau