Method and system of computer assistance for the reduction of a fracture

• US 20060241388A1
• Filed: 01/18/2006
• Published: 10/26/2006
• Est. Priority Date: 01/18/2005
• Status: Active Grant

• Current Assignee: Minmaxmedical
• Original Assignee: Universite Joseph Fourier
• Inventors: Lavallee, Stephane
• Granted Patent: US 7,618,419 B2
• Time in Patent Office: Days
• US Class Current: 600/416
• CPC Class Codes: A61B 17/1703 using imaging means, e.g. by X-rays
• CPC Class Codes: A61B 2017/564 Methods for bone or joint treatment
• CPC Class Codes: A61B 2034/105 Modelling of the patient, e.g. for ligaments or bones
• CPC Class Codes: A61B 2034/2055 Optical tracking systems
• CPC Class Codes: A61B 2090/364 Correlation of different images or relation of image positions in respect to the body
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61B 34/20 Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
• CPC Class Codes: A61B 90/36 Image-producing devices or illumination devices not otherwise provided for

Abstract

A method and system of computer assistance to the preparation of the reduction of a fracture such that a patient'"'"'s bony fragments areseparated into first and second bone segments, with in bone segments being symmetrical to a third bone element The method includes the steps of determining a first representation or bone model of the surface of the first bone segment, a second representation, at an initial position, of the second segment, and a third representation of the third bone element; determining by symmetry a fourth representation of the first and second bone segments of the fractured bone in the absence of a fracture, the fourth representation being matched with the first representation; matching the second representation with the fourth representation at a final position; and providing, by an interface element information representative of the difference between the initial position and the final position.

Claims

1. A method for the computer assisted repair of a bone fracture comprising the steps of:

acquiring intra-operative imaging data of a first bone segment, a second bone segment, and a third bone element;

generating a first bone model based upon the imaging data of the first bone segment, and a second bone model based upon the imaging data of the second bone segment;

determining an initial position of first and second bone models;

generating a third bone model based upon the imaging data of the third bone element;

determining a final position of the first and second bone models based upon the third bone model; and

providing position information of the first and second bone models to a user for the reduction of the first and second bone segments.

2. The method of claim 1, further comprising the steps of:

generating a fourth bone model that includes the first and second bone models positioned symmetrically with the third bone model; and

determining a final position of the first and second bone models based upon the fourth bone model.

3. The method of claim 1, wherein the step of acquiring imaging data comprises the step of acquiring imaging data using an ultrasound device.

4. The method of claim 1, wherein the step of generating the first and second bone models comprises the steps of:

determining characteristic points of the first bone segment and the second bone segment; and

deforming the first and second bone model based upon the determined characteristic points of the first and second bone segments.

5. The method of claim 1, wherein the position information comprises translation vectors and rotation angles.

6. The method of claim 1, wherein the step of determining the third bone model comprises the steps of:

determining characteristic points of the third bone element; and

generating a third bone model of the third bone element based upon the determined characteristic points of the third bone element.

7. A computer assisted system in support of repairing a bone fracture, comprising:

a first locatable element attachable to a first bone segment;

a second locatable element attachable to a second bone segment;

a sensor for acquiring intra-operative imaging data of bones;

a tridimensional positioning system locating the positions of the first and second locatable elements;

a computer in communication with the tridimensional positioning system and configured to generate;

a first bone model of a bone in response to the sensor acquiring data on the first bone segment;

a second bone model of a bone in response to the sensor acquiring data on the second bone segment;

a third bone model of a bone in response to the sensor acquiring data on a third bone element; and

a fourth bone model wherein the first and second bone models are repositioned based upon the third bone model; and

an interface connected to the computer so as to output the generated first, second, third, and fourth bone models and position information of the first, second, third, and fourth bone models.

8. The system of claim 7, further comprising a bone holder for statically positioning the third bone element, having a third locatable element locatable within the tridimensional positioning system.

9. The system of claim 7, wherein the locatable element comprises at least one of a retro-reflective marker and a light emitting diode.

10. The system of claim 7, wherein the interface is at least one of a display and a screen.

11. The system of claim 7, wherein the sensor comprises at least one of a palpation device and an ultrasound probe.

12. The system of claim 7, wherein the tridimensional positioning system comprises infrared emitters and infrared sensors.

13. The system of claim 7, further comprising a fourth locatable element removably attachable to a nail for connecting the first and second bone segments locatable within the tridimensional positioning system.

14. A computer assisted system in support of repairing a bone fracture, comprising:

a first locatable element attachable to a first bone segment,

a second locatable element attachable to a second bone segment;

a non-radiation based imaging device for acquiring imaging data of bones;

a tridimensional positioning system locating the positions of the first and second locatable elements;

a computer in communication with the tridimensional positioning system and configured to generate;

a first bone model of a bone in response to the sensor acquiring data on the first bone segment;

a second bone model of a bone in response to the sensor acquiring data on the second bone segment;

a third bone model of a bone in response to the sensor acquiring data on a third bone element; and

a fourth bone model wherein the first and second bone models are repositioned based upon the third bone model; and

an interface connected to the computer so as to output the generated first, second, third, and fourth bone models and position information of the first second, third, and fourth bone models.

15. The system of claim 14, further comprising a bone holder for statically positioning the third bone element, having a third locatable element locatable within the tridimensional positioning system.

16. The system of claim 14, wherein the locatable element comprises at least one of a retro-reflective marker and a light emitting diode.

17. The system of claim 14, wherein the interface is at least one of a display and a screen.

18. The system of claim 14, wherein the non-radiation based imaging device comprises at least one of a palpation device and an ultrasound probe.

19. The system of claim 14, wherein the tridimensional positioning system comprises infrared emitters and infrared sensors.

20. The system of claim 14, further comprising a fourth locatable element removably attachable to a nail for connecting the first and second bone segments locatable within the tridimensional positioning system.