Device and system for pulse oximetry based on bioelectrical impedance

A computing device for monitoring a blood condition, comprising:

• processing circuitry;
• a memory accessible to the processing circuitry, the memory including a signal processing code module;
• a communications module accessible to the processing circuitry, wherein the signal processing code module includes instructions, executable by the processing circuitry, to process bioimpedance (BImp) measurement signals received via the communications module;
• and
• wherein the signal processing code module further includes instructions, executable by the processing circuitry, to perform the following:
• filter at least two BImp measurement signals of different frequencies using a band-pass filter, wherein the band-pass filter defines a frequency band;
• perform feature point extraction on the at least two filtered BImp measurement signals to generate a plurality of arterial pulse wave features;
• select, from the plurality of arterial pulse wave features, at least one arterial pulse wave feature for each of the at least two BImp measurement signals;
• compare the at least one selected feature of each of the at least two BImp measurement signals to determine phase shift information, wherein the phase shift information represents a phase shift between the at least two BImp measurement signals;
• and
• determine, based on the determined phase shift information, an oxygen saturation percentage of the patient.

A method of determining blood oxygen saturation, comprising:

• receiving, at a computing device, at least two bioimpedance (BImp) measurement signals of a patient, the at least two BImp measurement signals include a first BImp measurement signal and a second BImp measurement signal, wherein the first BImp measurement signal is of a first frequency and the second BImp measurement signal is of a second frequency different from the first frequency;
• wherein, including, for each of the at least two BImp measurement signals, an arterial pulse wave representing impedance changes through a vascular bed of the patient over time;
• filtering each of the at least two BImp measurement signals using a band-pass filter, wherein the band-pass filter defines a frequency band;
• performing, on the at least two filtered BImp measurement signals, feature point extraction to generate a plurality of arterial pulse wave features;
• selecting, from the plurality of arterial pulse wave features, at least one arterial pulse wave feature for each of the at least two BImp measurement signals;
• comparing the selected features of the at least two BImp measurement signals to determine phase shift information, wherein the phase shift information represents a phase shift between the at least two BImp measurement signals;
• and
• determining, based on the determined phase shift information, a blood oxygen level and saturation percentage of the patient.