Impedance-calibrated diagnostic medical devices
AssigneeNovascan, Inc.
InventorsLes Bogdanowicz, Alexander Grycuk, Paul Richard Voith, William David Gregory
Life of this patent
Estimating the term…
Abstract
Various embodiments set forth medical devices. In some embodiments, the medical device includes an impedance bridge, an instrument head that includes one or more electrode pairs and a calibration impedance, and one or more wire pairs that couple the impedance bridge to the one or more electrode pairs and the calibration impedance. The disclosed medical devices compensate for impedance caused by extraneous factors arising from manufacturing and materials variances while measuring the impedance of tissue.
Claims13
A method for determining a property of tissue, the method comprising:
- recording, at one or more frequencies across an impedance bridge, one or more calibration impedance measurements that indicate an impedance of a first circuit that includes at least the impedance bridge, a calibration impedance load that is included in an instrument head of a medical device, and a first wire pair that passes within a catheter of the medical device and that is electrically coupled to the calibration impedance load;
- recording, at one or more frequencies across the impedance bridge, one or more impedance measurements that indicate an impedance of a second circuit that includes at least the impedance bridge, one or more electrode pairs that are included in the instrument head, and a second wire pair that passes within the catheter and that is electrically coupled to the one or more electrode pairs;
- determining one or more compensated impedance measurements based on the one or more calibration impedance measurements and the one or more impedance measurements;
- and
- performing at least one action based on the one or more compensated impedance measurements.
Dependencies are inferred from the claim text.