ASYMMETRIC GAIN OF CAPACITIVE SENSORS FOR MEASURING PHYSIOLOGICAL PARAMETERS
First Claim
1. A physiological sensor configured to be positioned onto tissue of a patient, the sensor comprising:
- a first conductive element with an associated first gain property and disposed about an optical emitter;
a second conductive element with an associated second gain property and disposed about an optical detector; and
a sensor body coupled to the first conductive element and the second conductive element and configured to interface with tissue of the patient.
1 Assignment
0 Petitions
Accused Products
Abstract
Systems, methods, sensors, and software for providing enhanced measurement and correction of physiological data are provided herein. In one example, a capacitive sensor of a measurement system is positioned onto tissue of a patient. The capacitive sensor includes one or more conductive elements with associated gain properties that are positioned near optical sensor elements proximate to the tissue of the patient, the optical sensor elements positioned to measure a photoplethysmogram (PPG) for the tissue. The measurement system drives the capacitive sensor and measures capacitance signals associated with the capacitance sensor. The measurement system corrects for at least motion noise in the PPG using the capacitance signals.
-
Citations
20 Claims
-
1. A physiological sensor configured to be positioned onto tissue of a patient, the sensor comprising:
-
a first conductive element with an associated first gain property and disposed about an optical emitter; a second conductive element with an associated second gain property and disposed about an optical detector; and a sensor body coupled to the first conductive element and the second conductive element and configured to interface with tissue of the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A measurement system, comprising:
-
a capacitance system configured to measure a first capacitance signal from a first capacitance element positioned proximate to an optical emitter that emits an optical signal into tissue of a patient; the capacitance system configured to measure a second capacitance signal from a second capacitance element positioned proximate to an optical detector that detects the optical signal after propagation through the tissue of the patient, the second capacitance element having an associated gain asymmetric to that of the first capacitance element; a processing system configured to compare the first capacitance signal to the second capacitance signal to identify a differential capacitance signal; the processing system configured to use at least the differential capacitance signal to identify a corrected PPG by reducing a magnitude of a noise component in a photoplethysmogram (PPG) that is derived from the optical signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A physiological measurement apparatus, comprising:
-
a generally ring-shaped first capacitor plate configured to interface with tissue of a patient to emit an electric field proximate to the tissue of the patient, the first capacitor plate having a first associated gain property; a generally ring-shaped second capacitor plate configured to interface with the tissue of the patient and having a second associated gain property different than the first gain property; a measurement system electrically coupled to the first capacitor plate and the second capacitor plate and configured to; generate an electric signal referenced to a ground potential; drive the electric signal to the first capacitor plate for emission as the electric field; electrically couple the second capacitor plate to the ground potential; monitor properties of the electric signal during emission into the tissue of the patient to identify a capacitance signal associated with the first capacitor plate; and process the capacitance signal to determine one or more physiological metrics associated with the patient. - View Dependent Claims (18, 19, 20)
-
Specification