CAS MEDICAL SYSTEMS, INC. Patent applications |
Patent application number | Title | Published |
20150308946 | METHOD FOR SPECTROPHOTOMETRICALLY DETERMINING A BLOOD OXYGEN PARAMETER - According to an aspect of the present invention, a near infrared spectroscopy (NIRS) sensor assembly, system, and method for measuring a characteristic of a biological tissue is provided. The NIRS sensor assembly includes a light source, at least one light detector, and a subject contact layer. The light source is operable to emit light at one or more predetermined wavelengths. The light detector has an active area for detecting light emitted by the light source and passed through the biological tissue. The detector is operable to produce signals representative of the detected light. The subject contact layer is disposed to cover one or both of the light detector and the light source. The subject contact layer has at least one optically transmissive portion. | 10-29-2015 |
20140171761 | NIRS SENSOR ASSEMBLY INCLUDING EMI SHIELDING - A NIRS sensor assembly includes a light source, a light detector, a first insulating layer, an EMI shielding layer, and a second insulating layer. The first insulating layer covers an exposed portion of the light detector. An optically transparent portion of the first insulating layer is aligned with an active area of the light detector. The EMI shielding layer covers the first insulating layer. An optically transparent portion of the EMI shielding layer is aligned with the active area of the light detector. The second insulating layer covers the EMI shielding layer and the first insulating layer. An optically transparent portion of the second insulating layer is aligned with the active area of the at least one light detector. | 06-19-2014 |
20140121481 | SIGNAL MONITORING SYSTEM INCLUDING EMI-SHIELDING COUPLER - An apparatus for electrically and mechanically coupling a connection portion of a sensor assembly with a connection portion of an interface cable is provided. The apparatus includes a frame having an EMI shielding material. The frame defines a first port operable to engage the connection portion of the sensor assembly and a second port operable to engage the connection portion of the interface cable. The frame includes attachment features operable to mechanically secure the connection portion of the sensor assembly and the connection portion of the interface cable relative to the frame. The frame is configured to provide a Faraday Cage around substantially all of the connection portion of the sensor assembly and the connection portion of the interface cable when the connection portions are in coupled configuration. | 05-01-2014 |
20140100823 | SYSTEMS AND METHODS FOR SPECTROSCOPIC MEASUREMENT OF A CHARACTERISTIC OF BIOLOGICAL TISSUE - A method and system for spectroscopic measurement of a characteristic of a biological tissue is provided. The method includes the steps of: (1) using at least one light source to emit light that penetrates the biological tissue; (2) using at least one light detector to detect light emitted by the at least one light source and passed through the biological tissue, and to convert the detected light into a detection signal, the detection signal including an unwanted noise component; and (3) using a processor to process the detection signal and to determine an adjusted peak-to-peak amplitude value that is representative of an amplitude of the detection signal adjusted for the unwanted noise component. | 04-10-2014 |
20140094668 | METHOD FOR SPECTROPHOTOMETRIC BLOOD OXYGENATION MONITORING - According to the present invention, a method and apparatus for non-invasively determining the blood oxygen saturation level within a subject's tissue is provided. The method comprises the steps of: a) providing a spectrophotometric sensor operable to transmit light into the subject's tissue, and to sense the light; b) detecting light after passage through the subject's tissue using the sensor, and producing initial signal data from the light sensed; c) calibrating the sensor to that particular subject using the initial signal data, thereby accounting for the specific physical characteristics of the particular subject's tissue being sensed; and d) using the calibrated sensor to determine the blood oxygen parameter value within the subject's tissue. | 04-03-2014 |
20130204105 | METHOD AND APPARATUS FOR MONITORING A BLOOD OXYGEN SATURATION LEVEL RELATIVE TO A SATURATION THRESHOLD VALUE - A method and apparatus for monitoring a blood oxygen saturation level within a subject's tissue is provided. The method includes the steps of: a) sensing the subject's tissue using a near infrared spectrophotometric oximeter, and producing a value representative of the oxygen saturation level within the sensed tissue; b) comparing the determined saturation value to a predetermined threshold oxygen saturation value; and c) determining at least one of a time under threshold (TUT) value or an area under threshold (AUT) value using the determined saturation value and the threshold value. | 08-08-2013 |
20130023744 | METHOD FOR SPECTROPHOTOMETRIC BLOOD OXYGENATION MONITORING OF ORGANS IN THE BODY - A method and apparatus for non-invasively determining a blood oxygen saturation level within an organ of a subject using direct application of a near infrared spectrophotometric sensor is provided. The method includes the steps of: a) transmitting a light signal directly into the subject's organ using the sensor; b) sensing a first intensity of the light signal and a second intensity of the light signal, after the light signal travels a predetermined distance through the organ of the subject; c) determining an attenuation of the light signal along multiple different wavelengths using the sensed first intensity and sensed second intensity; d) determining a difference in attenuation of the light signal between wavelengths; and e) determining the blood oxygen saturation level within the subject's organ using the difference in attenuation between wavelengths. | 01-24-2013 |
20130012822 | APPARATUS FOR MEASURING THE LUMINANCE AND TEMPERATURE OF A LIGHT SOURCE OF A SPECTROPHOTOMETRIC DEVICE - A system for measuring the luminance and temperature of a light source element of a spectrophotometric device is provided. The system includes a photodiode, a luminance measuring device, a temperature measuring device, a first switch, and a controller. The photodiode is operable to receive light signals emitted by the light source element and passing through a subject's body tissue. The luminance measuring device is operable to measure luminance of the light signals received by the photodiode. The temperature measuring device is operable to measure the temperature of the photodiode. The first switch is operable to connect the photodiode to the luminance measuring device or the temperature measuring device. The controller is operable to control the connection of the first switch. | 01-10-2013 |
20120271130 | METHOD AND APPARATUS FOR DETERMINING AN OXYGEN DESATURATION EVENT - A method and apparatus for determining an index indicative of a subject's response to an oxygen desaturation condition is provided. The method includes the steps of: a) providing a NIRS tissue sensor, a pulse oximetry sensor, and a processor in communication with the NIRS tissue sensor and the pulse oximetry sensor; b) sensing the subject's tissue using the NIRS tissue sensor and producing first signals; c) sensing the subject's tissue using the pulse oximetry sensor and producing second signals; d) processing the first signals to determine a change in tissue oxygen saturation values, processing the second signals to determine a change in arterial oxygen saturation values; and e) determining the index indicative of the subject's response to the oxygen desaturation condition using the change in tissue oxygen saturation values and the change in arterial oxygen saturation values. | 10-25-2012 |
20120136225 | METHOD FOR SPECTROPHOTOMETRIC BLOOD OXYGENATION MONITORING OF THE LOWER GASTROINTESTINAL TRACT - A method and apparatus for non-invasively determining a blood oxygen saturation level and/or the presence of fecal matter within a subject's lower GI tissue is provided. The method includes the steps of: a) providing a spectrophotometric sensor operable to transmit light into the subject's tissue, and to sense the light; b) sensing the subject's lower GI Tissue Using the Sensor, and Producing signal data from sensing the subject's tissue; c) processing the signal data, including determining the presence of one or more wavelength dependent light absorbing materials not present within blood within the subject's lower GI tract from the signal data; and d) determining the blood oxygen saturation level and/or presence of fecal matter within the subject's lower GI tissue, including accounting for the presence of the wavelength dependent light absorbing material not present within blood within the subject's lower GI tract determined using the signal data. | 05-31-2012 |
20120108927 | METHOD FOR SPECTROPHOTOMETRIC BLOOD OXYGENATION MONITORING - A method and apparatus for non-invasively determining the blood oxygenation within a subject's tissue is provided that utilizes a near infrared spectrophotometric (NIRS) sensor capable of transmitting a light signal into the tissue of a subject and sensing the light signal once it has passed through the tissue via transmittance or reflectance. | 05-03-2012 |
20120065485 | APPARATUS AND METHOD FOR NON-INVASIVELY DETERMINING OXYGEN SATURATION OF VENOUS BLOOD AND CARDIAC OUTPUT USING NIRS - A method and apparatus for determining a venous oxygen saturation value (SvO2) of a subject is provided. The method includes the steps of: a) sensing a plurality of tissue regions on a subject using a NIRS oximeter adapted to determine a tissue oxygen saturation value (StO2) for each region, each region independent of the other regions and each region sensed using a NIRS oximeter sensor specific to that region, and determining a StO2 value for that region; b) assigning a coefficient to each region, each of which coefficients reflects a portion of the StO2 value for the region attributable to a composite venous blood return representative of the tissue regions measured; and c) determining a composite SvO2 value for the subject using the StO2 region values and the respective coefficients. | 03-15-2012 |
20110237910 | STABILIZED MULTI-WAVELENGTH LASER SYSTEM FOR NON-INVASIVE SPECTROPHOTOMETRIC MONITORING - A spectroscopic method and system that monitors oxygenation levels in biological tissue is provided. The system includes a sensor portion, a monitor portion, and at least one optical fiber light stabilizer. The sensor portion includes at least one sensor assembly, which sensor assembly has at least one light signal outlet, and at least one light detector adapted to sense light and produce detected signals. The monitor portion has a processor in communication with the light detector in the sensor assembly, and a light source adapted to produce laser light signals at a plurality of different wavelengths. The optical fiber light stabilizer is adapted to stabilize the laser light signals. The processor is adapted to process the detected signals to determine oxygenation levels within the biological tissue. | 09-29-2011 |
20110028812 | METHOD FOR SPECTROPHOTOMETRIC BLOOD OXYGENATION MONITORING - A method and apparatus for non-invasively determining a blood oxygenation level within a subject's tissue is provided. The method includes the steps of: a) providing a spectrophotometric sensor operable to transmit light into the subject's tissue, and to sense the light; b) inputting into the sensor at least one of the subject's age, weight, brain development, and head size; c) spectrophotometrically sensing the subject's tissue along a plurality of wavelengths using the sensor, and producing signal data from sensing the subject's tissue; and d) processing the signal data utilizing the at least one of the subject's age, weight, brain development, and head size, to determine the blood oxygen saturation level within the subject's tissue using a difference in attenuation between the wavelengths. | 02-03-2011 |
20100105998 | METHOD AND APPARATUS FOR SPECTROPHOTOMETRIC BASED OXIMETRY OF SPINAL TISSUE - A near infrared spectrophotometric sensor for non-invasive monitoring of blood oxygenation levels in a subject's spinal cord tissue and spinal cord blood vessels is provided. The sensor includes at least one light source and at least one light detector. The light source is operative to emit near infrared light signals of a plurality of different wavelengths. The light detector is operative to sense light signals emitted from the light source and passed through the subject's spinal tissue, and to produce a sensor signal representative of the sensed light signals The light source is separated from the light detector by a distance representative of a distance from a first vertebrae structure of a human spine to a second vertebrae structure of the human spine, to permit alignment of the light source and detector with the first and second vertebrae structure. | 04-29-2010 |
20100087719 | METHOD AND APPARATUS FOR DETERMINING CEREBRAL DESATURATION IN PATIENTS UNDERGOING DEEP HYPOTHERMIC CIRCULATORY ARREST - A method and apparatus for determining cerebral oxygen saturation in a subject is provided. The method comprises the steps of: a) determining tissue oxygen saturation values using a NIRS type oximeter over a period of time; b) modeling a rate of change in the tissue oxygen saturation values; and c) determining an amount of time until a predetermined tissue oxygen saturation value is reached using the modeling of the tissue oxygen saturation values. | 04-08-2010 |
20090281403 | METHOD FOR SPECTROPHOTOMETRIC BLOOD OXYGENATION MONITORING - According to the present invention, a method and apparatus for non-invasively determining the blood oxygen saturation level within a subject's tissue is provided. The method comprises the steps of: 1) providing a near infrared spectrophotometric sensor operable to transmit light along a plurality of wavelengths into the subject's tissue; 2) sensing the light transmitted into the subject's tissue using the sensor, and producing signal data representative of the light sensed from the subject's tissue; 3) processing the signal data to account for physical characteristics of the subject; and 4) determining the blood oxygen saturation level within the subject's tissue using a difference in attenuation between the wavelengths. The apparatus includes a sensor having a light source and at least one light detector, which sensor is operably connected to a processor. The sensor is operable to transmit light along a plurality of wavelengths into the subject's tissue, and produce signal data representative of the light sensed from the subject's tissue. The algorithm is operable to process the signal data to account for the physical characteristics of the subject being sensed. | 11-12-2009 |
20090108205 | NIRS SENSOR MOUNTING APPARATUS - A near infrared spectrophotometric (NIRS) sensor apparatus is provided that includes at least one NIRS sensor and a mounting device. The sensor has at least one light source, at least one light detector, and a flexible pad. The light source and the light detector are mounted on the flexible pad, which flexible pad has a peripheral edge that extends around the entire periphery of the pad. The light source and light detectors are configured for connection to an electro-optical cable. The mounting device is operable to secure the sensor to a subject, which mounting device is sized to cover the sensor and contact the subject around the entire peripheral edge of the pad. The mounting device includes a light barrier that at least substantially blocks light from passing through the mounting device. | 04-30-2009 |
20080300474 | Indicators For A Spectrophotometric System - A near-infrared spectrophotometric system (e.g., a cerebral oximeter) includes a sensor portion and a monitor portion. The monitor portion includes a processor that runs an algorithm which utilizes the amount of detected light to determine the value of the oxygen concentration (e.g., the absolute level of oxygen concentration). The monitor portion also includes a visual display that displays the determined oxygen concentration values in various formats. The monitor portion may also include an audible device (e.g., a speaker), that provides audible indications of the determined oxygen concentration values. Various visual indicators may include, for example, color-coded graphs of the determined oxygenation values to alert the system user, for example, whether one hemisphere of the brain, or one or more regions of the brain, is in danger of adverse and potentially permanent damage. Also, data may be pre-processed by selecting the most clinically concerning sensor value (e.g., the sensor with the lowest value), and displaying only that sensor value and its identification on the display screen. Alternatively, an average value of multiple sensor measurements may be displayed. This reduces screen clutter and increases the speed of interpretation by the system user. Also, all sensor values may be averaged, and the average value displayed. The determined oxygenation values may also be provided in an audible format. | 12-04-2008 |
20080300473 | Stabilized Multi-Wavelength Laser System for Non-Invasive Spectrophotometric Monitoring - A spectroscopy system that may be used for spectrophotometric oxygenation monitoring of tissue includes a monitor portion and a sensor portion. The sensor portion generally includes a light source and one or more light detectors. The sensor portion may attach to a human to sense light signals from the light source that have traversed biological tissue, the light signals ultimately being used by the system to determine biological tissue blood hemoglobin oxygenation levels. The monitor portion generally includes a processor and a visual display. A laser beam combiner may couple a plurality of laser diode output light signals into one optical fiber. To stabilize the output of each of the laser diodes, an optical fiber light stabilizer is coupled to the combined laser diode output. The optical fiber light stabilizer redistributes the modes in the optical fiber such that the higher-order modes are filled until an equilibrium mode distribution is established. A light sensor may also provide feedback with respect to the laser diode output, which allows for compensation of any laser diode light output instability independently of optical fiber related instabilities. | 12-04-2008 |
20080285029 | Calibration Device for a Spectrophotometric System - A method and apparatus for calibrating an NIRS system which includes a sensor portion ( | 11-20-2008 |