Abstract: A patient monitoring sensor having a communication interface, through which the patient monitoring sensor can communicate with a monitor is provided. The patient monitoring sensor includes a light-emitting diode (LED) communicatively coupled to the communication interface and a detector, communicatively coupled to the communication interface, capable of detecting light. The patient monitoring sensor includes an optically absorptive material at least partially between the LED and the detector to reduce or prevent shunting of light to the detector.

Abstract: The present disclosure provides systems and methods for calibrating a medical device utilizing LED emission by characterizing the spectrum distribution of the LED emission and mapping such characterized spectrum distribution to calibration coefficients, e.g.

Abstract: The present disclosure provides systems and methods for calibrating a medical device utilizing LED emission by characterizing the spectrum distribution of the LED emission and mapping such characterized spectrum distribution to calibration coefficients, e.g., gamma coefficients.

Abstract: An example system includes an elongated body, a fluorescent material, and a diffuse reflector. The elongated body defines a lumen and includes a proximal portion and a distal portion. The fluorescent material is configured to be in fluid communication with a fluid in the lumen. The diffuse reflector is configured to diffuse excitation light received from an excitation light source and direct the diffused excitation light toward the fluorescent material and diffuse the fluoresced light received from the fluorescence material and direct the fluoresced light toward a fluorescent light detector.

Abstract: An example device includes an elongated body defining a lumen, the elongated body comprising a proximal portion and a distal portion; and one or more sensors configured to: stimulate a fluorescence response from one or more fluorescent probes released into a fluid and flowing with the fluid through the lumen; and detect the fluorescence response, wherein the fluorescence response is indicative of a composition of the fluid.

Abstract: An example system includes an elongated body, a fluorescent material, and a diffuse reflector. The elongated body defines a lumen and includes a proximal portion and a distal portion. The fluorescent material is configured to be in fluid communication with a fluid in the lumen. The diffuse reflector is configured to diffuse excitation light received from an excitation light source and direct the diffused excitation light toward the fluorescent material and diffuse the fluoresced light received from the fluorescence material and direct the fluoresced light toward a fluorescent light detector.

Abstract: An example device includes processing circuitry configured to receive, from an oxygen sensor, an ambient air signal indicative of an oxygen partial pressure of ambient air. The processing circuitry is further configured to receive, from an atmospheric pressure sensor, an atmospheric pressure sensor signal indicative of atmospheric pressure. The processing circuitry is configured to determine, based on the atmospheric pressure sensor signal, an oxygen partial pressure of the ambient air, determine, based at least in part on the oxygen partial pressure of the ambient air and the ambient air signal, the one or more calibration parameters, and calibrate, based on the one or more calibration parameters, the oxygen sensor. The calibrated oxygen sensor may be used to, for example, determine the oxygen content of urine of a patient to monitor renal function of the patient.

Abstract: Example systems, catheters, and methods are disclosed for actively sampling a fluid. An example system includes a pump configured to pump fluid to direct the fluid a dissolved oxygen sensor and the dissolved oxygen sensor configured to output a signal indicative of an amount of dissolved oxygen in the fluid.

Abstract: The present disclosure provides systems and methods for improving signal-to-noise ratio (SNR) for a medical device sensor operating in reflective mode such that light from an emitter travels through tissue via reflection to a first detector at a first depth to provide a first detected signal over time and such that light from the emitter travels through tissue via reflection to a second detector at a second, greater depth to provide a second detected signal over time, with subtracting out the signal from superficial tissue that is common to the first and the second detected signals to provide an improved signal-to-noise ratio for the medical device sensor.

Abstract: This disclosure is directed to devices, systems, and techniques for monitoring one or more patient conditions. For example, a system includes a memory and processing circuitry communicatively coupled to the memory. The processing circuitry is configured to receive, from a sensor, an electrical representation of a first optical signal and control a pressure device to apply pressure to the patient in order to affect one or more physiological parameters proximate to the sensor. Additionally, the processing circuitry is configured to receive, from the sensor after applying the pressure to the patient, an electrical representation of a second optical signal; and determine, based on the electrical representation of the first optical signal and the electrical representation of the second optical signal, one or more patient conditions.

Abstract: A light sensing device includes a first light source configured to emit light within a first wavelength range, a second light source configured to emit light within a second wavelength range, detector circuitry, a first photodetector in the detector circuitry configured to detect the light within the first wavelength range, and a second photodetector in the detector circuitry configured to detect the light within the second wavelength range. The first photodetector and the second photodetector are in parallel in the detector circuitry such that the detector circuitry sums electrical signals outputted by the first photodetector and the second photodetector.

Abstract: A method for measuring oxygen saturation includes determining a difference in voltage value for a light emitting diode based on a first voltage at the light emitting diode for a first current and a second voltage at the light emitting diode for a second current and determining a temperature for the light emitting diode based on the difference in voltage value. The method further includes determining an intensity of a received photonic signal corresponding to an output photonic signal output using the light emitting diode and determining an oxygen saturation level based on the intensity of the received photonic signal and the temperature for the light emitting diode. The method further includes outputting an indication of the oxygen saturation level.

Abstract: A method includes determining a difference in voltage value for a light emitting diode based on a first voltage at the light emitting diode for a first current and a second voltage at the light emitting diode for a second current and determining a temperature for the light emitting diode based on the difference in voltage value. The method further includes outputting an indication of the temperature.

Abstract: A method for measuring oxygen saturation includes determining a difference in voltage value for a light emitting diode based on a first voltage at the light emitting diode for a first current and a second voltage at the light emitting diode for a second current and determining a temperature for the light emitting diode based on the difference in voltage value. The method further includes determining an intensity of a received photonic signal corresponding to an output photonic signal output using the light emitting diode and determining an oxygen saturation level based on the intensity of the received photonic signal and the temperature for the light emitting diode. The method further includes outputting an indication of the oxygen saturation level.

Abstract: The present disclosure provides systems and methods for calibrating for errors dependent upon spectral characteristics of tissue for a medical device by estimating a spectral characteristic of tissue providing error due to scattering or absorption of emitted light based upon operating the sensor in reflectance mode to generate a first SpO2 reading and estimating error due to spectral characteristics of skin therefrom, operating the sensor in transmissive mode to generate a second SpO2 reading, and applying a correction to a pulse oximetry transmissive mode measurement to correct for the error dependent upon the estimated spectral characteristic of tissue.

Abstract: The present disclosure provides systems and methods for correcting for errors dependent upon spectral characteristics of tissue for a medical device by estimating a spectral characteristic of tissue providing error due to scattering or absorption of emitted light based upon a ratio of measurements for a patient.

Abstract: Example assemblies and techniques for introducing a conductive element into a catheter are disclosed. An example assembly includes a sensing device configured to sense a parameter of interest in a fluid, the sensing device including sensor circuitry at a distal portion, a sensing element at a proximal portion, and a conductive element communicatively coupled to the sensor circuitry and the sensing element. The assembly includes an introducer defining an introducer lumen configured to receive at least a portion of the conductive element of the sensing device, the introducer being configured to be inserted into a catheter lumen of a catheter while the at least the portion of the conductive element is in the introducer lumen. The assembly further includes a rigid member mechanically coupled to the sensing device and configured to open a longitudinal surface of the introducer as the introducer is retracted relative to the sensing device.

Abstract: A device for measuring oxygen saturation includes circuitry configured to determine a measured difference of forward voltage based on a first forward voltage at a first light emitting diode and a second forward voltage a second light emitting diode and determine that the first and second light emitting diodes are valid based on a calibrated difference of forward voltage and the measured difference of forward voltage. In response to the determination that the first and second light emitting diodes are valid, the circuitry is configured to determine an oxygen saturation level.

Abstract: The present disclosure provides systems and methods for calibrating a medical device utilizing LED emission by characterizing the spectrum distribution of the LED emission and mapping such characterized spectrum distribution to calibration coefficients, e.g.

Abstract: A patient monitoring sensor having a communication interface, through which the patient monitoring sensor can communicate with a monitor is provided. The patient monitoring sensor includes a light-emitting diode (LED) communicatively coupled to the communication interface and a detector, communicatively coupled to the communication interface, capable of detecting light. The patient monitoring sensor includes an optically absorptive material at least partially between the LED and the detector to reduce or prevent shunting of light to the detector.