US 12,167,908 B2
Dynamic bio impedance range adjustment for a medical device
Hyun J. Yoon, Vadnais Heights, MN (US); Jon E. Thissen, Rosemount, MN (US); Jerry D. Reiland, Coon Rapids, MN (US); and Ashley L Galarneau, Eagan, MN (US)
Assigned to Medtronic, Inc., Minneapolis, MN (US)
Filed by Medtronic, Inc., Minneapolis, MN (US)
Filed on Jul. 20, 2021, as Appl. No. 17/380,705.
Claims priority of provisional application 63/059,562, filed on Jul. 31, 2020.
Prior Publication US 2022/0031184 A1, Feb. 3, 2022
Int. Cl. A61B 5/053 (2021.01); A61B 5/25 (2021.01)
CPC A61B 5/053 (2013.01) [A61B 5/25 (2021.01); A61B 2562/0219 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A device comprising:
a plurality of electrodes;
sensing circuitry configured to sense a bio impedance; and
processing circuitry configured to:
apply an excitation signal to the plurality of electrodes via the sensing circuitry, wherein applying the excitation signal establishes a bio impedance measurement range within which a bio impedance value is measurable and outside of which the bio impedance value is not measurable as being outside of the bio impedance measurement range, the bio impedance measurement range having an upper boundary limit defining a highest value of the bio impedance measurement range and a lower boundary limit defining a lowest value of the bio impedance measurement range;
based on the application of the excitation signal, determine a sensed bio impedance value within the bio impedance measurement range;
determine whether the sensed bio impedance value is within a predetermined portion of the bio impedance measurement range for a predetermined period of time, the predetermined portion of the bio impedance measurement range being smaller than the bio impedance measurement range and comprising either the upper boundary limit or the lower boundary limit; and
based on a determination of the sensed bio impedance value being within the predetermined portion of the bio impedance measurement range for the predetermined period of time, adjust the excitation signal,
wherein adjusting the excitation signal adjusts the bio impedance measurement range to generate an adjusted bio impedance measurement range by changing at least one of the upper boundary limit or the lower boundary limit.