Patent ID: 11944389
Assignee: ST. JUDE MEDICAL, CARDIOLOGY DIVISION, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A method for correction of an impedance shift in an impedance based coordinate system, comprising:
generating a second electromagnetic registration in response to a detected impedance shift based on fiducial points created by applying an inverse of a pre-shifted electromagnetic registration to magnetic locations of the magnetic position sensor in combination with shifted impedance locations of the electrode;
receiving a subsequent shifted impedance location of an electrode in a shifted impedance based coordinate system;
applying the second electromagnetic registration generated after the impedance shift is detected to transform the subsequent shifted impedance location of the electrode to a pre-shifted impedance location of the electrode; and
applying the pre-shifted electromagnetic registration to the pre-shifted impedance location of the electrode to transform the pre-shifted impedance location of the electrode into a shift corrected location of the electrode in a magnetic based coordinate system, and the shift corrected location is consistent with a magnetic location of a magnetic position sensor in the magnetic based coordinate system, wherein the pre-shifted electromagnetic registration is generated before the impedance shift is detected.