Bio-impedance sensor and sensing method

摘要

Implantable medical devices and techniques are implemented that use bio-impedance to measure aspects of patient physiology. A signal separation method is performed at least in part in an implantable device. The method involves detecting a plurality of impedance signals using a plurality of implantable electrodes coupled to the implantable device. The method further involves separating one or more signals from the plurality of impedance signals using a signal separation technique, such as an algorithm-based separation technique.

主权项

1. A medical device, comprising:
a plurality of implantable electrodes configured for concurrent sensing of bio-impedance across multiple vectors to provide a plurality of impedance signals, the plurality of impedance signals comprising a primary impedance signal that includes a respiratory component and noise comprising a cardiac stroke component that corrupts the respiratory component; and a processor coupled to the plurality of electrodes and configured to receive the plurality of impedance signals, the processor further configured to implement a signal separation technique on a combination of the plurality of impedance signals to separate a respiration signal from the plurality of impedance signals including the corrupting cardiac stroke component, the separated respiration signal characterized by the primary impedance signal substantially free of the corrupting cardiac stroke component.