Abstract: Embodiments described herein may include systems and method for monitoring physiological parameters of a patient. Specifically, embodiments disclose wireless, reusable, rechargeable medical sensors that include an inductive coil coupled to a rechargeable battery. Additionally, embodiments disclose systems and methods for recharging and disinfecting the disclosed medical sensors.

Abstract: Embodiments described herein may include systems and method for monitoring physiological parameters of a patient. Specifically, embodiments disclose wireless, reusable, rechargeable medical sensors that include an inductive coil coupled to a rechargeable battery. Additionally, embodiments disclose systems and methods for recharging and disinfecting the disclosed medical sensors.

Abstract: Embodiments described herein may include systems and method for monitoring physiological parameters of a patient. Specifically, embodiments disclose wireless, reusable, rechargeable medical sensors that include an inductive coil coupled to a rechargeable battery. Additionally, embodiments disclose systems and methods for recharging and disinfecting the disclosed medical sensors.

Abstract: The present disclosure relates generally to patient monitoring systems and, more particularly, to signal analysis for patient monitoring systems. In one embodiment, a method of analyzing a detector signal of a physiological patient sensor includes obtaining the detector signal from the physiological patient sensor, and determining a ratio of the signal between two or more channels. A distribution of the angles between the points of the ratio over time may be used to determine a true ratio or a ratio of ratios for use in the determination of a physiological parameter.

Abstract: According to embodiments, systems and methods are provided for detecting pulses in a PPG signal. Local minima and maxima points may be identified in the PPG signal. Each minimum may be paired with an adjacent maximum forming an upstroke segment. Noise may be removed by comparing adjacent segments and ignoring segments that are too long or too large. Notches in the pulse may be identified and ignored by analyzing adjacent segments. Adjacent upstroke segments may be combined as a single upstroke if the lengths of adjacent upstroke segments are about the same, have similar slopes, and the end point of one segment is close to the start point of an adjacent segment. Segments having small temporal or amplitude difference relative to adjacent segments may be disregarded. The remaining segments may represent the pulse upticks. A sliding time window may be used instead to detect pulses in the PPG signal.

Abstract: This disclosure describes systems and methods for controlling an exhalation valve based on pressure and/or flow measurements during exhalation. The disclosure describes novel exhalation valve controls for ventilating a patient.

Abstract: This disclosure describes systems and methods for providing an optimized proportional assist breath type during ventilation of a patient. The disclosure describes a novel breath type that delivers a target airway pressure calculated based on a desired patient effort range to a triggering patient.

Abstract: A patient monitoring system may determine portions of a PPG signal that correspond to artifacts, to a baseline shift that exceeds a threshold, or to a pulse-to-pulse variability that exceeds a threshold. The patient monitoring system may identify a contiguous portion of the PPG signal that does not include the determined portions. The contiguous portion of the PPG signal may be used to determine physiological information.

Abstract: Systems and methods for applying optical signals onto tissue of a patient are provided herein. In one example, a system to optically analyze tissue of a patient is provided. The system includes a measurement system configured to transfer source optical signals over an optical link, receive measurement optical signals over the optical link, and identify a value of a physiological parameter of the patient. The optical link comprises a first source portion with a first link property configured to carry the source optical signals and a second source portion with a second link property coupled to the first source portion and configured to carry the source optical signals. The system includes a tissue interface assembly configured to receive the source optical signals transferred over the optical link, emit the source optical signals into the tissue, and receive the measurement optical signals from the tissue for transfer over the optical link.

Abstract: A blood pressure measurement system is configured to perform a calibration automatically when a calibration condition is satisfied. The calibration condition is based upon one or more parameters of pulse waves of a subject. The parameters may include pulse wave area; a time difference between systolic peak and reflected wave peak or dichrotic notch in the pulse wave and a shape of at least a portion of the pulse wave.

Abstract: A method for ventilating a patient with a ventilator includes consecutively delivering a plurality of substantially equal volume amounts into a closed ventilator circuit during a ventilator self-test, receiving a pressure measurement for each volume delivery, calculating a change in pressure for each volume delivery, consecutively releasing a plurality of substantially equal volume amounts from the closed ventilator circuit during the ventilator self-test, calculating a change in pressure for each volume release, fitting the calculated change in pressure data for volume delivery and volume release to an inhalation non-linear model equation and an exhalation non-linear model equation, respectively, deriving one or more inhalation tubing compliance compensation coefficients from the inhalation non-linear model equation, and deriving one or more exhalation tubing compliance compensation coefficients from the exhalation non-linear model equation.

Abstract: This disclosure describes systems and methods for providing novel back-up ventilation that allows the patient to trigger or initiate the delivery of breath. Further, this disclosure describes systems and methods for triggering ventilation when base flow is unknown or undeterminable by the ventilator.

Abstract: The present disclosure relates to a system and method for sampling parametric data provided with a patient monitoring device. A disclosed method includes sampling parametric data associated with a patient and adjusting a sampling interval during the sampling of the parametric data based on a change in a frequency of a periodic physiological event associated with the patient. A disclosed system includes a server computer operative to sample parametric data associated with a patient and to adjust a sampling interval during the sampling of the parametric data based on a change in a frequency of a periodic physiological event associated with the patient.

Abstract: Systems and methods for applying optical signals into tissue of a patient are provided herein. In one example, a tissue interface pad for applying an optical signal to tissue of a patient is provided. The tissue interface pad includes a first surface configured to interface with the tissue of the patient, at least one guide channel disposed within the tissue interface pad and configured to route an input optical fiber carrying the optical signal to a first location in the tissue interface pad, and a second surface at the first location configured to direct the optical signal from the input optical fiber into the tissue through the first surface.

Abstract: According to some embodiments, systems and methods are provided for non-invasive continuous blood pressure determination. In some embodiments, a PPG signal is received and locations of pulses within the PPG signal are identified. An area within a particular pulse is measured. The area may be of just the upstroke, downstroke or the entire pulse. The area may be measured relative to a time-domain axis or a baseline of the pulse. The pulse may be split into multiple sections and the area of each section may be measured. The area of one portion of the pulse may correspond to systolic blood pressure while the area of another portion may correspond to diastolic blood pressure. Empirical data may be used to determine blood pressure from the measured area by applying calibration data measured by a suitable device.

Abstract: Systems and methods for applying optical signals into tissue of a patient are provided herein. In one example, a tissue interface system for applying optical signals to tissue of a patient is provided. The tissue interface system includes a tissue interface pad configured to apply the optical signals carried by at least one optical source into the tissue, and a pressurized volume configured to apply pressure to the tissue interface pad to couple a portion of the tissue interface pad to the tissue.

Abstract: According to embodiments, a respiration signal may be processed to normalize respiratory feature values in order to improve and/or simplify the interpretation and subsequent analysis of the signal. Data indicative of a signal may be received at a sensor and may be used to generate a respiration signal. Signal peaks in the respiration signal may be identified and signal peak thresholds may be determined. The identified signal peaks may be adjusted based on the signal peak threshold values to normalize the respiration signal.

Abstract: According to embodiments, techniques for selecting a consistent part of a signal, including a photoplethysmograph (PPG) signal, are disclosed. A pulse oximetry system including a sensor or probe may be used to obtain a PPG signal from a subject. Signal peaks may be identified in the PPG signal. Characteristics of the signal peaks, including the amplitude levels of the signal peaks and/or the time-distance between the signal peaks may be used to determine if the PPG signal is consistent. In an embodiment, signal peaks are processed based on a consistency metric, and the processed signal peaks are compared to the consistency metric to determine if the PPG signal is consistent. If the PPG signal is determined to be consistent, the PPG signal may be further analyzed to determine an underlying signal parameter, including, for example, a patient respiration rate.

Abstract: Techniques for detecting a signal quality decrease are disclosed. A sensor or probe may be used to obtain a plethysmograph or photoplethysmograph (PPG) signal from a subject. A wavelet transform of the signal may be performed and a scalogram may be generated based at least in part on the wavelet transform. One or more characteristics of the scalogram may be determined. The determined characteristics may include, for example, energy values and energy structural characteristics in a pulse band, a mains hum band, and/or a noise band. Such characteristics may be analyzed to produce signal quality values and associated signal quality trends. One or more signal quality values and signal quality trends may be used to determine if a signal quality decrease has occurred or is likely to occur.

Abstract: A tracheal tube assembly includes a cannula configured to be positioned in a patient airway and a customizable flange configured to be secured about the cannula. The customizable flange further includes a first flange portion and a second flange portion. The second flange portion is configured to be selectively removed from the customizable flange to customize the length of the customizable flange.