Point and click alignment method for orthopedic surgeons, and surgical and clinical accessories and devices
First Claim
1. A point and click method to implement intended manipulation of an external fixator frame by an orthopedic professional, comprising the steps of:
 a) providing a computer, said computer having an input screen in association therewith wherein said input screen has a plurality of sensors associated therewith to detect and register a plurality of position data inscribed on said input screen;
b) providing to said computer an algorithm which computes orientation data from said position data according to equations set forth in g) below;
c) taking at least two medical images of a patient to create two views, with each view'"'"'s showing at least one bone with at least one external fixator, said external fixator comprising external fixator hardware having at least one ring and said ring'"'"'s further forming a part of a sixaxis external fixator device and further comprising fixator hardware, with said at least two views being oriented from different angles and displayed on said input screen;
d) marking by said orthopedic professional one or more points or one or more lines on said input screen to create said position data, with said position data'"'"'s representing either or both of a position or positions of a bone, bones, bone segments, joint space, anatomic loci or osteotomy or one or more elements of said external fixator hardware;
e) extracting, using said algorithm, two or more sets of two dimensional coordinates corresponding to said points or lines on said images, calibrating said images, and thereby producing threedimensional x, y and z coordinates for i) angular orientations of bone or bone segments;
ii) angular orientations of said external fixator hardware, and iii) coordinates of a center of said ring; and
f) further calculating, via said algorithm, at least one pivot point as output to an orthopedic professional to depict as output to said orthopedic professional one or more adjustments to said angular orientations necessary to achieve an intended bone manipulation configuration, wherein said algorithm further comprisesg) defining orthogonal coordinates (x′
, y′
, z′
) for said fixator hardware, defining said coordinates as one of three translational displacements for each of three axes;
assigning Euler angles in the following sequenceRotate an angle ψ
(yaw) around the zaxisRotate an angle θ
(pitch) around the yaxisRotate an angle ϕ
(roll) around the xaxiswherein the coordinates q_{i }with respect to a Base reference framework of an anchor point p_{i }of a i^{th }leg are given by the equation
q_{i}=T+R_{B}*p_{i }where T is the translation vector, giving a positional linear displacement of the origin of the platform frame with respect to the Base reference framework, and p_{i }is the vector defining the coordinates of the anchor point P_{i }with respect to platform framework and, similarly,the length of the i^{th }leg is given by
l_{i}=T+R_{B}*p_{i}−
b_{i }wherein a vector b_{i }defines the coordinates of the lower anchor point B in order to set up 18 simultaneous nonlinear equations as to six unknowns representing position and attitude of the platform by implementing a mathematical optimization algorithm to extract data from said views to correlate a desired strut length with a desired geometric position for said fixator hardware.
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Abstract
The invention is a point and click method for positioning an external fixator on a patient, in which a surgeon—using a computer mouse or similar device—inscribes lines or points on a computer screen displaying an xray or other photographic image of the bones of a patient together with two rings in position adjacent the bones. By inscribing lines on the computer screen, the underlying drawings program detects the xy coordinates of any point on the screen when the user (the surgeon or other practitioner) clicks on it, and outputs the xy coordinates of every point identified by the user including the two points defining any desired line. The practitioner thus can, using “point and click” operation, govern the repositioning of two fixator rings on the bones of a patient.
10 Citations
5 Claims

1. A point and click method to implement intended manipulation of an external fixator frame by an orthopedic professional, comprising the steps of:

a) providing a computer, said computer having an input screen in association therewith wherein said input screen has a plurality of sensors associated therewith to detect and register a plurality of position data inscribed on said input screen; b) providing to said computer an algorithm which computes orientation data from said position data according to equations set forth in g) below; c) taking at least two medical images of a patient to create two views, with each view'"'"'s showing at least one bone with at least one external fixator, said external fixator comprising external fixator hardware having at least one ring and said ring'"'"'s further forming a part of a sixaxis external fixator device and further comprising fixator hardware, with said at least two views being oriented from different angles and displayed on said input screen; d) marking by said orthopedic professional one or more points or one or more lines on said input screen to create said position data, with said position data'"'"'s representing either or both of a position or positions of a bone, bones, bone segments, joint space, anatomic loci or osteotomy or one or more elements of said external fixator hardware; e) extracting, using said algorithm, two or more sets of two dimensional coordinates corresponding to said points or lines on said images, calibrating said images, and thereby producing threedimensional x, y and z coordinates for i) angular orientations of bone or bone segments;
ii) angular orientations of said external fixator hardware, and iii) coordinates of a center of said ring; andf) further calculating, via said algorithm, at least one pivot point as output to an orthopedic professional to depict as output to said orthopedic professional one or more adjustments to said angular orientations necessary to achieve an intended bone manipulation configuration, wherein said algorithm further comprises g) defining orthogonal coordinates (x′
, y′
, z′
) for said fixator hardware, defining said coordinates as one of three translational displacements for each of three axes;
assigning Euler angles in the following sequenceRotate an angle ψ
(yaw) around the zaxisRotate an angle θ
(pitch) around the yaxisRotate an angle ϕ
(roll) around the xaxiswherein the coordinates q_{i }with respect to a Base reference framework of an anchor point p_{i }of a i^{th }leg are given by the equation
q_{i}=T+R_{B}*p_{i }where T is the translation vector, giving a positional linear displacement of the origin of the platform frame with respect to the Base reference framework, and p_{i }is the vector defining the coordinates of the anchor point P_{i }with respect to platform framework and, similarly, the length of the i^{th }leg is given by
l_{i}=T+R_{B}*p_{i}−
b_{i }wherein a vector b_{i }defines the coordinates of the lower anchor point B in order to set up 18 simultaneous nonlinear equations as to six unknowns representing position and attitude of the platform by implementing a mathematical optimization algorithm to extract data from said views to correlate a desired strut length with a desired geometric position for said fixator hardware.  View Dependent Claims (2, 3, 4, 5)

1 Specification