Patent ID: 11918334
Assignee: ST JUDE MEDICAL INTERNATIONAL HOLDING, SA.R.L.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 12:
13. A system for predicting impedance measurements and identifying a location of a medical device, comprising:
a catheter having a catheter electrode;
a medical positioning system configured to:
drive a plurality of surface patch electrodes associated with a three-dimensional space to generate an impedance field in the three-dimensional space; and
measure impedance responses of electrodes, separate from the surface patch electrodes, in the three-dimensional space;

a processor and memory for storing non-transitory computer readable instructions to:
obtain impedance measurements for electrodes disposed in the three-dimensional space from the medical positioning system; and
map independent impedance potential fields of a portion of the plurality of surface patch electrodes that are non-driven to the impedance measurements to generate an impedance model of the impedance field;
access a catheter model defining the catheter including the catheter electrode;
execute the catheter model to generate a predicted location of the catheter electrode;
generate predicted impedance values for the predicted location of a catheter electrode in the three-dimensional space using the impedance model, wherein the predicted location of the catheter electrode is provided by the catheter model;
obtain measured impedance values for the catheter electrode disposed in the three-dimensional space; and
generate calculated impedance values for the catheter electrode using the predicted impedance values and the measured impedance values; and
update the impedance model of the impedance field based on the predicted impedance values and the measured impedance values, wherein the updated impedance model is subsequently utilized to generate subsequent predicted impedance values for a predicted location of the catheter electrode, and the processor operates the above steps without transformation from impedance measurements to a magnetic-based coordinate system; and

a display configured to display a location of the catheter electrode generated using the calculated impedance values.