Bio-impedance sensor and sensing method
First Claim
Patent Images
1. A signal separation method performed at least in part in an implantable device, the method comprising:
- coupling a plurality of implantable electrodes to the implantable device to allow concurrent measurement of bio-impedance across multiple vectors, including intracardiac, trans-cardiac, and trans-thoracic vectors;
measuring a plurality of impedance signals concurrently across the multiple vectors using the plurality of implantable electrodes, 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 due to an overlap in heart and respiratory rates or an unstable heart rate; and
separating a respiration signal from the plurality of impedance signals including the cardiac stroke component using a signal separation technique on a combination of the plurality of impedance signals, the separated respiration signal characterized by the primary impedance signal substantially free of the corrupting cardiac stroke component; and
providing a system output based on the respiration signal.
2 Assignments
0 Petitions
Accused Products
Abstract
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.
35 Citations
29 Claims
-
1. A signal separation method performed at least in part in an implantable device, the method comprising:
-
coupling a plurality of implantable electrodes to the implantable device to allow concurrent measurement of bio-impedance across multiple vectors, including intracardiac, trans-cardiac, and trans-thoracic vectors; measuring a plurality of impedance signals concurrently across the multiple vectors using the plurality of implantable electrodes, 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 due to an overlap in heart and respiratory rates or an unstable heart rate; and separating a respiration signal from the plurality of impedance signals including the cardiac stroke component using a signal separation technique on a combination of the plurality of impedance signals, the separated respiration signal characterized by the primary impedance signal substantially free of the corrupting cardiac stroke component; and providing a system output based on the respiration signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. An implantable 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 multiple vectors including intracardiac, trans-cardiac, and trans-thoracic vectors, 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 due to an overlap in heart and respiratory rates or an unstable heart rate; and a processor coupled to the plurality of electrodes and configured to receive the plurality of impedance signals, the processor further configured to separate a respiration signal from the plurality of impedance signals including the cardiac stroke component using a signal separation technique on a combination of the plurality of impedance signals, the separated respiration signal characterized by the primary impedance signal substantially free of the corrupting cardiac stroke component. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
-
28. An implantable medical device, comprising:
-
a plurality of implantable electrodes coupled to the implantable device to allow concurrent measurement of bio-impedance across multiple vectors, including intracardiac, trans-cardiac, and trans-thoracic vectors; and a processor coupled to the plurality of implantable electrodes and configured to receive concurrently measured impedance signals across the multiple vectors using the plurality of implantable electrodes, 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 due to an overlap in heart and respiratory rates or an unstable heart rate, the processor configured to separate a respiration signal from the plurality of impedance signals including the cardiac stroke component using a source separation technique on a combination of the plurality of impedance signals, the separated respiration signal characterized by the primary impedance signal substantially free of the corrupting cardiac stroke component. - View Dependent Claims (29)
-
Specification