Orthosoft, Inc.

Orthosoft Holdings Inc.

Herbert André Jansen

Louis-Philippe Amiot

Daniel Odermatt

Isabelle Fontaine

Sébastien Jutras

Pierre Couture

Alain Richard

Bruno Falardeau

Benoît Pelletier

François Paradis

Éric Brosseau

Gabriel Coté

A CAS system and method for guiding an operator in inserting a femoral implant in a femur as a function of a limb length and orientation of the femoral implant with respect to the femur, comprising a reference tool for the femur, a registration tool, a bone altering tool and a sensing apparatus. A controller is connected to the sensing apparatus to: i) register a frame of reference of the femur by calculating surface information provided by the registration tool as a function of the position and orientation of the registration tool provided by the sensing apparatus, and/or retrieving in a database a model of the femur; ii) calculate a desired implant position with respect to the frame of reference as a function of the limb length; and iii) calculate a current implant position and orientation in relation to the desired implant position with respect to alterations being performed in the femur with the bone altering tool, as a function of the position and orientation of the bone altering tool provided by the sensing apparatus and of a digital model of a femoral implant provided by the database. The database is connected to the controller for the controller to store and retrieve information relating to an operation of the controller. The computer-assisted system may be used to guide an operator in inserting a pelvic implant in an acetabulum as a function of an orientation of the pelvic implant with respect to the pelvis.

Computer-assisted hip replacement surgery

A device (') for digitizing a center of rotation of a hip joint implant component (A,F) with respect to a bone element in computer-assisted surgery. The device (&#x2032;) comprises a detectable member () trackable for position and orientation by a computer-assisted surgery system (). A body () is connected to the detectable member () in a known geometry. The body () has a coupling portion () adapted to be coupled to the hip joint implant component (A,F) in a predetermined configuration. The center of rotation of the hip joint implant component (A,F) is calculable in the predetermined configuration as a function of the known geometry and of the position and orientation of the detectable member ().

Device, method and system for digitizing position and orientation information of hip joint implant components

A computer-assisted surgery system for guiding an operator in altering a pelvis. A sensing apparatus is provided for tracking a reference tool and a bone altering tool. A position calculator calculates a position and orientation of a pelvic frame of reference as a function of the tracking of the reference tool, and for calculating a position and orientation of the bone altering tool with respect to the frame of reference. A source of posture data and a posture data correction calculator are provided and are operative to provide a display of information allowing an operator to take into consideration the posture data from the source of posture data when altering the pelvis. A display unit is connected to the position calculator and to the posture data correction calculator for displaying the display of information and the bone altering tool with respect to the pelvic frame of reference.

Method for providing pelvic orientation information in computer-assisted surgery

An interface apparatus () for tracking by a tracking system () of an object(s) in space for position and orientation and for interacting with the tracking system (). The interface apparatus () comprises passive detectable devices () trackable for position by the tracking system (). A mounting device () receives the passive detectable devices () in a known geometry, and is secured to the object(s) such that a position and orientation of the object(s) is calculable by the tracking system () as a function of a tracking of the known geometry of the passive detectable devices (). One of the passive detectable devices () is displaceable with respect to the object(s). A displacement of the passive detectable device () with respect to the object(s) is detectable to initiate an interaction with the tracking system () while maintaining the tracking of the object(s).

Interface apparatus for passive tracking systems and method of use thereof

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 method of calibrating a circular portion of an object, such as to determine the center point of the object, is provided. The method includes determining spatial coordinates of at least two points on a circumferential edge of the circular portion of the object, and calculating the center point of the circular portion using the spatial coordinates of the two points and a geometric parameter representative of the diameter of the circular portion. A calibration device and system are also provided for use with a computer tracking system in order to calibrate such an object having a circular portion.

Method and apparatus for calibrating circular objects using a computer tracking system

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.

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Montréal, Canada

Herbert André Jansen