Pacemaker electrode
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Pacemaker Electrode. Bidirectional Interface to Autodesk Inventor. Capabilities of the Bidirectional Interface. Associatively transfer geometry from the open active document, either part or assembly, in Autodesk Inventor to COMSOL Multiphysics.

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Pacemaker Electrode

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Pacemaker electrode

Pacemaker Electrode

Bidirectional Interface to Autodesk Inventor


Capabilities of the bidirectional interface

Capabilities of the Bidirectional Interface

  • Associatively transfer geometry from the open active document, either part or assembly, in Autodesk Inventor to COMSOL Multiphysics.

  • Update geometry parameters in the open active document in Autodesk Inventor.

  • Set up an automatic parameter sweep for multiple geometry parameters. Take advantage of distributed memory systems, such as Windows and Linux clusters.


Model definition

Model Definition

Boundaries with applied positive potential.

  • The geometry represents a pacemaker electrode.

  • This model studies the heating effect of the current flowing through the surrounding tissue.

Grounded boundaries.

Cylinder representing the surrounding tissue.


Workflow

Workflow

  • Open the CAD file in Autodesk Inventor.

  • Transfer the geometry with the interface.

  • Set up and solve the model in COMSOL Multiphysics

    • Draw additional geometry

    • Define integration variable to evaluate the resistive heat

    • Assign material properties

    • Define boundary settings

    • Create a mesh

    • Solve the model.

  • Study the effect of geometry design parameters on the solution either by manual or automatic parametric sweep.


Pacemaker electrode

The bidirectional interface always transfers the geometry in the open active document in Autodesk Inventor.


Pacemaker electrode

In the COMSOL Multiphysics Model Navigator select the Conductive Media DC application mode.


Pacemaker electrode

In the COMSOL Multiphysics GUI select File>Inventor Connection>Initialize to transfer the geometry and initialize the connection between COMSOL Multiphysics and Autodesk Inventor.


Pacemaker electrode

When the transfer is ready the geometry appears in the COMSOL Multiphysics GUI.


Pacemaker electrode

Use the drawing tools in COMSOL Multiphysics to create the geometry for the surrounding tissue.


Pacemaker electrode

To evaluate the total resistive heat in the tissue define a variable in the Subdomain Integration Variables dialog box.


Pacemaker electrode

Set the material properties in the Subdomain Settings dialog box.


Pacemaker electrode

Define the electric potential and grounded boundaries in the Boundary Settings dialog box.


Pacemaker electrode

Click the Solve button to solve the model.

Slice plot of the electric potential in the tissue surrounding the electrode.


Pacemaker electrode

Use the Plot Parameters dialog box to plot the resistive heating in the tissue.


Parametric study

Parametric Study

  • Study the effect of design parameters on the resistive heating.

Position of grounded region.

Size of region where positive potential is applied.


Update of geometry parameters from the comsol multiphysics gui

Update of Geometry Parameters from the COMSOL Multiphysics GUI

  • Use the automatically generated geometry parameters in Autodesk Inventor or define your own parameters.

  • Define corresponding constants in COMSOL Multiphysics to which you can assign new values.

  • Update the geometry from the COMSOL Multiphysics GUI.

    • Geometry parameters and the geometry in the Autodesk Inventor document are updated and sent back to COMSOL Multiphysics

    • Subdomain, boundary and mesh settings are associative and retained in the updated model.

  • Solve the model again.


Pacemaker electrode

To find out the name of parameters in the Autodesk Inventor GUI edit a sketch.

In the sketch, double click on a dimension to edit it.

The parameter d12 is the radius of the sphere which we would like to update through the interface.


Pacemaker electrode

Click the Return button to leave the sketch.


Pacemaker electrode

Select Parameters on the Part Features panel.


Pacemaker electrode

Click Add to enter a new user parameter.


Pacemaker electrode

Define the parameter radius, with the value 0.5 mm.


Pacemaker electrode

Link the radius parameter to d12 by typing radius in the Equation field of d12.


Pacemaker electrode

The other design parameter, the position of the grounded region is d14, which is also found in Sketch1.

Control the value of d14 directly through the bidirectional interface.


Pacemaker electrode

In the COMSOL Multiphysics GUI select Constants from the Options menu.


Pacemaker electrode

Enter the constants radius and d14 and their new values 1 and 12, respectively.

During update of the geometry these constants will be transfered to Autodesk Inventor to update the corresponding parameters.


Pacemaker electrode

Select File>Inventor Connection>Update to transfer the constants to Autodesk Inventor and to transfer back the updated geometry to COMSOL Multiphysics.


Pacemaker electrode

When the transfer is ready the updated geometry appears in the COMSOL Multiphysics GUI.


Pacemaker electrode

In the Autodesk Inventor GUI the parameters and the geometry have been updated.


Pacemaker electrode

Click the Solve button in the COMSOL Multiphyiscs GUI to obtain the new solution.


Parametric sweep

Parametric Sweep

  • Automatically solve the model for a range of geometry parameters.

  • Obtain a log-file containing design parameters and selected global variables evaluated for each solved model.

  • Optionally save each solved model as an .mph file.


Pacemaker electrode

Select File>Inventor Connection>Geometric Parametric Sweep to set up and automatically solve the model for a range of geometry parameters.


Pacemaker electrode

Enter a name for the log file and list the variables to be evaluated.

Enter a list of geometry parameters, and a range of values

Click Solve to start the sweep.

You can also select to save each solved model file separately.


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