METHOD FOR VOLUME DETERMINATION AND GEOMETRIC RECONSTRUCTION

• US 20170209220A1
• Filed: 04/06/2017
• Published: 07/27/2017
• Est. Priority Date: 11/01/2007
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Krugman, Kimberly A., Ladtkow, Casey M.
• Granted Patent: US 10,321,962 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 18/1477 Needle-like probes
• CPC Class Codes: A61B 2017/00106 ultrasonic
• CPC Class Codes: A61B 2018/00011 with fluids
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/00738 Depth, e.g. depth of ablation
• CPC Class Codes: A61B 2018/00744 Fluid flow
• CPC Class Codes: A61B 2018/00791 Temperature
• CPC Class Codes: A61B 2034/104 Modelling the effect of the tool, e.g. the effect of an implanted prosthesis or for predicting the effect of ablation or burring
• CPC Class Codes: A61B 2090/378 using ultrasound
• CPC Class Codes: A61B 2090/3782 transmitter or receiver in catheter or minimal invasive instrument
• CPC Class Codes: A61B 2090/3925 ultrasonic
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61B 5/055 involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: A61B 6/037 Emission tomography
• CPC Class Codes: A61B 6/12 Arrangements for detecting or locating foreign bodies
• CPC Class Codes: A61B 6/4488 Means for cooling A61B6/045 takes precedence
• CPC Class Codes: A61B 8/0841 for locating instruments
• CPC Class Codes: A61B 8/481 involving the use of contrast agent, e.g. microbubbles introduced into the bloodstream analysis of echo signal exploiting properties of a contrast enhancer in devices for short-range imaging with acoustic waves G01S7/52039

Abstract

A method for determining a volume of ablated tissue includes the steps of supplying energy to tissue, indicating an axis within the tissue, and simulating slicing of the tissue substantially perpendicular to the axis to obtain a plurality of simulated slices. Each of the plurality of simulated slices has a thickness, a cross-sectional perimeter, and a trajectory point defined by the axis within the tissue. The method further includes the steps of determining a volume of each of the plurality of simulated slices based on the trajectory point, the cross-sectional perimeter, and the thickness of each simulated slice, and summing the volumes from each of the plurality of simulated slices to obtain the volume of the ablated tissue.

Claims

1. A method for determining a volume of ablated tissue comprising the steps of:

supplying energy to tissue;

indicating an axis within the tissue;

simulating slicing of the tissue substantially perpendicular to the axis to obtain a plurality of simulated slices, each of the plurality of simulated slices having a thickness, a cross-sectional perimeter, and a trajectory point defined by the axis;

determining a volume of each of the plurality of simulated slices based on the trajectory point, the cross-sectional perimeter, and the thickness of each simulated slice; and

summing the volumes from each of the plurality of simulated slices to obtain the volume of the ablated tissue.

2. The method as in claim 1, wherein the energy of the supplying step is electrosurgical.

3. The method as in claim 1, wherein the energy of the supplying step is supplied to at least one electrode.

4. The method as in claim 1, further comprising the step of determining a surface area for each of the plurality of simulated slices based on the position of the trajectory point relative to the cross-sectional perimeter.

5. The method as in claim 4, further comprising the step of determining the volume of each of the plurality of simulated slices by integrating the thickness and the surface area of each slice.

6. The method as in claim 1, wherein the simulating step includes imaging the tissue utilizing an imager to generate image data, the method further comprising the step of displaying a graphical representation of the tissue via a display based on the image data.

7. The method as in claim 6, wherein the imager is selected from the group consisting of ultrasound, CT, MRI, and PET imaging modalities.

8. The method as in claim 6, further comprising the step of determining the cross-sectional perimeter for each of the plurality of simulated slices from the image data generated by the imager.

9. The method as in claim 1, further comprising the step of surgically removing the ablated tissue.

10. The method as in claim 1, further comprising the step of graphically representing the ablation volume in 3-D based on coordinates of the cross-sectional perimeter.

11. The method as in claim 1, further comprising the step of graphically comparing the ablation volume to a pre-determined geometry provided by the graphical display.

12. The method as in claim 11, further comprising the step of determining a completeness factor based on deviations between the ablation volume and the pre-determined geometry.

13. The method as in claim 1, further comprising the step of determining an effect from structures adjacent the tissue on the ablation volume determination based on deviations from the center of mass of the trajectory.

14. The method as in claim 1, further comprising the step of supplying a contrast agent to the ablation volume.

15. An electrosurgical system comprising:

an electrosurgical generator coupled to at least one electrode configured for insertion into a portion of tissue to supply electrosurgical energy thereto to create an ablation volume therein;

a feedback unit coupled to an imager that images the portion of tissue, the feedback unit configured to obtain a graphical scan of the ablation volume and the at least one electrode; and

a controller configured to indicate an axis of the at least one electrode within the graphical scan, the controller further configured to simulate slicing the graphical scan substantially perpendicular to the axis to obtain a plurality of simulated slices, each of the plurality of simulated slices having a thickness, a cross-sectional perimeter, and a trajectory point defined by the axis of the at least one electrode, the controller further configured to determine a volume of each of the plurality of simulated slices based on the trajectory point, the cross-sectional perimeter, and the thickness of each simulated slice and to sum the volume of each of the plurality of slices to determine the ablation volume.

16. A method of storing a library of ablation data related to the use of a treatment device

comprising the step of.

providing a treatment device having a particular configuration;

supplying electrosurgical energy to the treatment device for application on tissue to generate a plurality of feedback parameters based on the particular configuration of the treatment device;

providing an imaging device that images tissue to create at least one image corresponding to the plurality of feedback parameters based on the particular configuration of the treatment device, the imaging device configured to communicate with a feedback unit that stores a library of ablation data;

storing the at least one image and the plurality of feedback parameters in the library of ablation data for subsequent retrieval, wherein the at least one image and the plurality of feedback parameters corresponds to the particular configuration of the treatment device when applied to tissue; and

determining a completeness factor based on deviations between the at least one image corresponding to feedback parameters based on the particular configuration of the treatment device and ablation data stored in the library corresponding to feedback parameters generated by application to tissue of a treatment device having substantially the same configuration.

17. The method according to claim 16, wherein the determining step is done substantially simultaneously with the supplying step.

18. The method according to claim 16, wherein the plurality of feedback parameters generated includes at least one of power, time, tip size of the treatment device, a tip configuration of the treatment device, and a configuration of an expected ablation volume.

19. The method according to claim 16, further comprising the step of adjusting the use of the treatment device based on the completeness factor.

20. The method according to claim 16, wherein the deviations are determined based on geometry.