Patent ID: 11883115
Assignee: NORTHERN DIGITAL INC.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 0:
1. A magnetic tracking device, comprising:
a sensor configured to generate a sensor electromotive force (EMF) that measures a magnetic field that is generated by a magnetic field transmitter;
a mechanism configured to select between a first operating mode in which the sensor generates the sensor EMF when receiving the magnetic field and a second operating mode in which the sensor generates a reduced sensor EMF when receiving the magnetic field;
an interconnecting circuit configured generate a parasitic EMF in each of the first operating mode and the second operating mode when receiving the magnetic field;
wherein the interconnecting circuit is configured to connect to a processing device, the processing device configured to:
receive a first measurement for the first operating mode, the first measurement representing the sensor EMF and the parasitic EMF;
receive a second measurement for the second operating mode, the second measurement representing the parasitic EMF and the reduced sensor EMF;
compare the first measurement and the second measurement; and
based on comparing the first measurement and the second measurement, determine an approximate value of the sensor EMF,

wherein the mechanism comprises a diode in parallel with the sensor, the diode configured to be reverse biased in the first operating mode and configured to be forward biased in the second operating mode.