88 results about "Oxygen Saturation Measurement" patented technology

A signal processor generates basis functions and identifies at least one basis function component of a sensor signal in order to calculate a physiological measurement. The signal processor is advantageously applied to pulse oximetry so as to directly calculate oxygen saturation and so as to calculate a robust oxygen saturation measurement. In particular, a signal component transform may be calculated within a window around a derived pulse rate estimate. A signal component transform may also utilize sinusoidal basis functions, and an optimization of a signal component transform may occur at a particular frequency or a set of frequencies. A sinusoidal waveform or waveforms at that frequency or set of frequencies is generated to select associated red and infrared components of the sensor signal, and an oxygen saturation is calculated from a magnitude ratio of these components.

An oxygen concentration measurement system for blood hemoglobin comprises a multiple-wavelength low-coherence optical light source that is coupled by single mode fibers through a splitter and combiner and focused on both a target tissue sample and a reference mirror. Reflections from both the reference mirror and from the depths of the target tissue sample are carried back and mixed to produce interference fringes in the splitter and combiner. The reference mirror is set such that the distance traversed in the reference path is the same as the distance traversed into and back from the target tissue sample at some depth in the sample that will provide light attenuation information that is dependent on the oxygen in blood hemoglobin in the target tissue sample. Two wavelengths of light are used to obtain concentrations. The method can be used to measure total hemoglobin concentration [Hb.sub.deoxy +Hb.sub.oxy ] or total blood volume in tissue and in conjunction with oxygen saturation measurements from pulse oximetry can be used to absolutely quantify oxyhemoglobin [HbO.sub.2 ] in tissue. The apparatus and method provide a general means for absolute quantitation of an absorber dispersed in a highly scattering medium.

A medical sensor may be adapted to account for factors that cause irregularities in pulse oximetry measurements or other spectrophotemetric measurements. Sensors are provided with surface features that reduce the amount of outside light or shunted light that impinge the detecting elements of the sensor. The sensor is adapted to reduce the effect of outside light or shunted light on pulse oximetry measurements.

A medical sensor may be adapted to account for factors that cause irregularities in pulse oximetry measurements or other spectrophotemetric measurements. Sensors are provided with surface features that reduce the amount of outside light or shunted light that impinge the detecting elements of the sensor. The sensor is adapted to reduce the effect of outside light or shunted light on pulse oximetry measurements.

An intravenous implantable optical sensor assesses the relative absorbance of multiple wavelengths of light in order to determine oxygen saturation. The calculation of oxygen saturation is enhanced by use of a function of hematocrit which is derived from the relative absorbance of light of an isobestic wavelength along two different length paths through the blood. The use of the hematocrit-dependent term and multiple wavelengths of light to calculate oxygen saturation provides results that are less susceptible to noise and variation in hematocrit and thus provides a more accurate measure of oxygen saturation over a wider range of conditions than previously possible. The optical sensor may form part of an implantable system which performs the calculation of oxygen saturation and uses the results for a diagnostic or therapeutic purpose.

A medical sensor may be adapted to account for factors that cause irregularities in pulse oximetry measurements or other spectrophotemetric measurements. Sensors are provided with surface features that reduce the amount of outside light or shunted light that impinge the detecting elements of the sensor. The sensor is adapted to reduce the effect of outside light or shunted light on pulse oximetry measurements.

Methods and systems are disclosed for determining information from a signal using least median squares techniques, including determining blood oxygen saturation measurements based at least in part on photoplethysmograph signals. In an embodiment, a Lissajous figure is generated based on multiple measurements and least median squares techniques may be used for one or more of: determining information, assessing measurement confidence, filtering measurements, and choosing a regression analysis technique.

A medical sensor may be adapted to prevent unwanted light and electrical interference from corrupting physiological measurements. Sensors are provided with features that reduce the amount of outside light or shunted light that impinge the detecting elements of the sensor. The sensor is adapted to reduce crosstalk between electrical signals, increasing the accuracy of measurements. The sensor is also adapted to reduce the effect of outside light or shunted light on pulse oximetry measurements.

A wearable device for comprehensive bio-monitoring of physiologic metrics to determine metabolic, pulmonary and cardiac function and oxygen saturation measurements from breathing mask apparatuses. The device non-invasively monitors the physiologic profile of the subject, and is capable of detecting physiologic changes, predicting onset of symptoms, and alerting the wearer or another person or system. In some embodiments, the device comprises both a wearable sensor suite and a portable gas composition and flow analysis system. In preferred embodiments, it comprises a miniaturized non-invasive sensor suite for detecting physiologic changes to detect dangerous breathing or other health conditions. The acquired physiologic profile is used to generate alarms or warnings based on detectable physiological changes, to adjust gas delivery to the subject, alter mission profiles, or to transfer control of the craft or other duties away from a debilitated subject. The device is compact, portable, vehicle independent and non-encumbering to the subject.

A tail mounted clip adapted to receive one or more sensors thereon that incorporate at least one circular groove on a tail engaging face thereof for locating the clip on the tail of a subject and retaining clip and associated sensor(s) properly in place. This configuration allows the clip to be securely located in any circumferential orientation around the tail of the subject. The present invention will have the sensors properly positioned adjacent the tail and will prevent relative movement between the sensors and the tail. The tail mounting clip is used to hold an LED sensor and photodiode for making pulse-oximetry measurements, also called a photoplethysmographs.

An observation object is imaged under irradiation with oxygen saturation level measurement light to obtain a first image signal, and the observation object is imaged under irradiation with white light to obtain a second image signal. A normal light image is produced from the second image signal. An oxygen saturation level is calculated from the first and second image signals. The calculated oxygen saturation level is imaged in an oxygen saturation image. By superimposing the normal light image on the oxygen saturation image, an emphasized oxygen saturation image is produced. In the emphasized oxygen saturation image, an abnormal area in which a calculation result of the oxygen saturation level is likely to be abnormal is emphasized by its brightness. The produced emphasized oxygen saturation image is displayed on a display device.

Devices and systems have a sensor probe configured to measure tissue oxygen saturation in the intestine or mesentery. The devices and systems can determine the oxygenation state of the entire thickness of the intestine or mesentery. Thus, embodiments of the invention can be applied in diagnosing intestinal ischemia in a patient, as well as in monitoring tissue oxygen saturation of the intestine or mesentery during or after a surgical procedure.

A medical device such as an oximeter includes a marking feature. In an implementation, a marking mechanism of the device marks tissue based on a location of where a measurement was taken by the device. In an implementation, the marking mechanism of the device marks tissue based on an oxygen saturation measurement obtained by the device.

The present invention is a wearable device for comprehensive bio-monitoring of physiologic metrics to determine metabolic, pulmonary and cardiac function and oxygen saturation measurements from breathing mask apparatuses. The device non-invasively monitors the physiologic profile of the subject, and is capable of detecting physiologic changes, predicting onset of symptoms, and alerting the wearer or another person or system. In some embodiments, the device comprises both a wearable sensor suite and a portable gas composition and flow analysis system. In preferred embodiments, it comprises a miniaturized non-invasive sensor suite for detecting physiologic changes to detect dangerous breathing or other health conditions. The system utilizes advanced fast-response sensors with improved efficiency and lifespan, and provides rapid analysis for substantially real-time monitoring of the subject's present condition to predict, mitigate and/or prevent the onset of dangerous conditions.

The invention discloses an oxyhemoglobin saturation detection method and an oxyhemoglobin saturation detection system. The oxyhemoglobin saturation detection system comprises a preprocessing device, a standard model establishing device, an SSF processing device, a waveform characteristic judging device, a device for extracting waveforms of pulses one by one, a signal quality index calculating device, a device for calculating a distance between adjacent peaks of pulse signals, an R value calculating device, an R value Kalman filtering device and an oxyhemoglobin saturation calculating device. In the system adopting the oxyhemoglobin saturation detection method of the technical scheme, because sampled data close to the slope and maximum points of the waveforms of the pulses is selected as sample points for calculating the oxyhemoglobin saturation during calculation, the sample points better represent the oxygen content of blood in a human body, and calculation errors caused by noise interference when peak points/valley points serving as characteristic value points are extracted are avoided, so the noise interference can be effectively reduced, the signal-to-noise ratio of the oxyhemoglobin saturation is improved and the detection accuracy of the oxyhemoglobin saturation is improved.

The present invention provides an endoscope system (10) and a light source device (13). The light source device (13) of the endoscope system (10) is provided with a white light source (30). In the optical path of the light source, a rotating light filter (34) and a bandpass light filter (40). The rotating light filter (34) divides the color of the white color to three colors, namely B, G and R. The bandpass light filter (40) separates narrow-waveband light N from the colors of the white light. The bandpass light filter (40) is a device which is used for generating oxygen saturation measurement light that is used for measuring oxygen saturation of hemoglobin in blood, and has an optical characteristic that two narrow-waveband light N11 and N12 which are used for oxidizing hemoglobin and reducing hemoglobin and have wavebands that the light absorption coefficients are same. Because of the oxygen saturation measurement light is combined with light amount of two narrow-waveband light N11 and N12, the measurement precision or image brightness can be remarkably improved.

The present specification discloses systems and methods of patient monitoring in which multiple sensors are used to detect physiological parameters and the data from those sensors are correlated to determine if an alarm should, or should not, be issued, thereby resulting in more precise alarms and fewer false alarms. Electrocardiogram readings can be combined with invasive blood pressure, non-invasive blood pressure, and/or pulse oximetry measurements to provide a more accurate picture of pulse activity and patient respiration. In addition, the monitoring system can also use an accelerometer or heart valve auscultation to further improve accuracy.

The invention discloses a blood oxygen saturation measuring method and instrument and belongs to the technical field of measurement. The method includes utilizing light sources to emit red light and infrared, utilizing photoelectric receivers to acquire the maximum value and the minimum value of red light signals and infrared signals to obtain the ratio of the difference value of the maximum value and the minimum value of the red light signals and the difference value of the maximum value and the minimum value of the infrared signals, arranging the light sources and the photoelectric receivers in the way that at least two different distances are formed between the light sources and the receivers, repeating the steps to obtain more than two ratios, determining the ratio with the largest absolute value in the more than two ratios to calculate a blood oxygen saturation measuring value, wherein one light source and more than two photoelectric receivers with different distances between the light source and the receivers or one photoelectric receiver or more than two light sources with different distances between the receiver and the light sources are adopted to achieve the arrangement that at least two different distances are formed between the light sources and the receivers. By means of the blood oxygen saturation measuring method and instrument, the accurate blood oxygen saturation measuring value can be obtained, the blood oxygen saturation measuring accuracy is improved, and the use is simple.

The invention provides endoscope image display techniques which can display images emphatically displaying blood vessel operation patterns and display information directly and clearly indicating whether parts with the blood vessel operation patterns are disease parts. A target is irradiated by oxygen saturation measurement light and blood vessel emphasizing illuminating light alternately. A colorful camera element is used for image acquisition of the target and image data with 2 frames is obtained. In the image data with 2 frames, blue image data (Bs) obtained during lighting of the oxygen saturation measurement light is distributed to a B channel of a display device and blue image data (Bn) and green image data (Gn) obtained during lighting of the blood vessel emphasizing illuminating light are distributed to a G channel and an R channel of the display device. When surface layer blood vessels and middle and deep layer blood vessels are emphatically displayed and only when the oxygen saturation is low, a second narrow-band image with change of the color of the surface layer blood vessels is displayed by the display device.