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7570979 |
Methods and apparatus for patient monitoring
A respiratory monitoring apparatus that detects changes in physiological parameters relevant to respiration, including blood oxygen and blood volume, using near infrared spectroscopy. Methods for...
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7522949 |
Sensor with signature of data relating to sensor
A sensor has codes useful for a monitor which can be authenticated as accurate. The sensor produces a signal corresponding to a measured physiological characteristic and provides codes which can be...
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7489809 |
Interactive virtual endoscopy
The invention relates to a method for processing of a three-dimensional image data set, wherein the three-dimensional image data set is converted to a data set suitable for a two-dimensional image...
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7424142 |
Display and analysis of medical images using calibrated pixel values in units of known properties of reference materials
Methods to calibrate and display medical images with pixel values with known properties of one or more reference materials provide images which allow more accurate quantification of certain tissue...
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7392075 |
Method for enhancing pulse oximetry calculations in the presence of correlated artifacts
A method for determining a physiological parameter in the presence of correlated artifact, including obtaining two digital waveforms, x and y, the waveforms being representative of the absorption...
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7383069 |
Method of sample control and calibration adjustment for use with a noninvasive analyzer
A method and apparatus for easing the use of an optically based noninvasive analyzer is presented. More particularly, a simplified algorithm is used that removes the daily requirement of collecting...
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7292721 |
Calibration of tissue densities in computerized tomography
A hybrid calibration method uses a calibration phantom (exterior reference) scanned simultaneously with the patient, and one or more known tissues of the subject (interior reference) to create a...
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7227629 |
Calibration tool for an optical measuring device with an optical fiber probe
An optical measurement device calibration tool includes an optical probe suitable for calibrating various optical imaging devices, for example, low coherence reflectometers and optical coherence...
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7184809 |
Pulse amplitude indexing method and apparatus
The invention is method and apparatus for determining a physiological characteristic by detecting the intensity of light following tissue absorption at two wavelengths, estimating the pulse...
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7142901 |
Parameter compensated physiological monitor
A monitor has a primary input from which a spectral characteristic of a tissue site can be derived. The monitor also has a secondary input from which at least one parameter can be determined. A...
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7124048 |
System and method for a self-calibrating non-invasive sensor
A non-invasive emitter-photodiode sensor which is able to provide a data-stream corresponding to the actual wavelength of light emitted thereby allowing calibration of the sensor signal processing...
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7072701 |
Method for spectrophotometric blood oxygenation monitoring
A method and apparatus for non-invasively determining the blood oxygen saturation level within a subject's tissue is provided that utilizes a near infrared spectrophotometric (NIRS) sensor capable...
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6882874 |
Compensation of human variability in pulse oximetry
The invention relates to the calibration of a pulse oximeter intended for non-invasively determining the amount of at least two light-absorbing substances in the blood of a subject. In order to...
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6839580 |
Adaptive calibration for pulse oximetry
A method for calibrating a pulse oximeter device and an apparatus incorporating the method and a system for utilizing the method. The method is based on modeling light propagation in tissue at two...
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6801797 |
Pulse oximeter sensor with piece-wise function
A memory in a sensor is used to store multiple coefficients for a physiological parameter. In one embodiment, not only are the sensor's specific calibration coefficients stored in a memory in the...
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6760609 |
Adaptive calibration pulsed oximetry method and device
A method for determining an arterial blood oxygen saturation level according to this invention includes measuring the light transmittance through tissue of light of a first wavelength and a second...
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6711425 |
Pulse oximeter with calibration stabilization
An improved pulse oximeter (sensor and monitor) uses a plurality of wavelengths selected to provide sensitivity to both oxygen saturation and deviations in tissue site characteristic(s) from...
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6668183 |
Diode detection circuit
A photoplethysmographic system and method is provided to identify compatible sensors to monitors and/or for determining sensor attributes. The improved system includes a signal generation means for...
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6628975 |
Oximeter sensor with digital memory storing data
The present invention provides a memory chip for use in an oximeter sensor, or an associated adapter or connector circuit. The memory chip allows the storing of different data to provide enhanced...
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6615061 |
Optical sensor having a selectable sampling distance for determination of analytes
A method and apparatus for the measurement of trans-cutaneous diffuse reflectance at a single sampling distance for determining the concentration of an analyte in a biological sample, such as, for...
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6606510 |
Oximeter sensor with digital memory encoding patient data
The present invention provides a memory chip for use in an oximeter sensor, or an associated adapter or connector circuit. The memory chip allows the storing of patient related data, such as...
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6600940 |
Oximeter sensor with digital memory
The present invention provides a memory chip for use in an oximeter sensor, or an associated adapter or connector circuit. The memory chip allows the storing of different data to provide enhanced...
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6591123 |
Oximeter sensor with digital memory recording sensor data
The present invention provides a memory chip for use in an oximeter sensor, or an associated adapter or connector circuit. The memory chip allows the storing of different data to provide enhanced...
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6553241 |
Oximeter sensor with digital memory encoding sensor expiration data
The present invention provides a memory chip for use in an oximeter sensor, or an associated adapter or connector circuit. The memory chip allows the storing of sensor expiration data to provide...
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6497659 |
System for identifying a cable transmitting a signal from a sensor to an electronic instrument
A system is described for identifying a cable transmitting a signal from a sensor to an electronic instrument. The cable includes a reactance element such as a capacitor or an inductor. The system...
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6490466 |
Interconnect circuit between non-compatible oximeter and sensor
An oximeter sensor adapter which allows a sensor without a resistor in parallel with its LEDs to operate with an oximeter expecting such a resistor in parallel. The adapter has a switching circuit...
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6473632 |
Total hemoglobin concentration measurement
A method for operating a spectrophotometric instrument of the type for measuring the oxygenation state of hemoglobin in tissue. The method includes the use of stored hemoglobin concentration...
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6463310 |
Method and circuit for storing and providing historical physiological data
A mechanism for storing and providing historical physiological data, such as blood oxygen saturation data, for a patient. In particular, the historical physiological data is stored in a storage...
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6456862 |
Method for non-invasive spectrophotometric blood oxygenation monitoring
A method and apparatus for non-invasively determining the blood oxygen saturation level within a subject's tissue is provided that utilizes a near infrared spectrophotometric (NIRS) sensor capable...
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6400973 |
Arterial blood flow simulator
An artificial blood flow simulator to be used to test or calibrate a pulse oximeter has a body which is at least partially transparent to red and infrared light waves. Within the body is a light...
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6356774 |
Oximeter sensor with encoded temperature characteristic
A method for operating an oximeter sensor, and corresponding apparatus, which includes an encoded temperature characteristic of a light emitter in the sensor. The encoded temperature characteristic...
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6351658 |
Multiple-code oximeter calibration element
An encoding element which is backward compatible and will provide a single coded value to older analyzers in response to first signal, but will also provide a second coded value to a new analyzer...
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6298252 |
Oximeter sensor with encoder connected to detector
An oximeter sensor with an encoding element connected to the photodetector. The encoding element is read by reverse-biasing the photodetector, rather than using a lower voltage.
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6141572 |
Process and system for simultaneously simulating arterial and non-arterial blood oxygen values for pulse oximetry
A problem in pulse oximetry is discriminating between arterial and non-arterial oxygen. Non-arterial oxygen can become detectable by an oximeter when a patient moves, obscuring the oximeter's...
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5891025 |
Method of validating and/or calibrating devices used for carrying out photometry of living tissues and a device for implementing said method
The invention concerns a process for validation of devices for photometry of living tissue, which encompasses the following steps: in vitro adjusting of a particular concentration of a substance...
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5662106 |
Oximeter with motion detection for alarm modification
A pulse oximeter which modifies the alarm condition when motion is detected. Basically, if the lack of a pulse is determined to be as a result of motion artifact, the generation of an alarm is...
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5421329 |
Pulse oximeter sensor optimized for low saturation
A pulse oximeter sensor with a light source optimized for low oxygen saturation ranges and for maximizing the immunity to perturbation induced artifact. Preferably, a red and an infrared light...
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5368224 |
Method for reducing ambient noise effects in electronic monitoring instruments
The present invention provides a method and apparatus for adapting to noise sources affecting a pulse oximeter. Various available frequencies are evaluated to determine their respective noise...
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5357953 |
Measurement device and method of calibration
A calibration method and apparatus capable of being calibrated according to the method that allows a remote sensor to be transferred from analyzing instrument to analyzing instrument within a group...
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5348002 |
Method and apparatus for material analysis
Disclosed is a method and apparatus for determining the presence and/or concentration of chemical species which absorb electromagnetic energy, dependent to a degree upon the chemical species and...
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5341804 |
System for disabling oximeter in presence of ambient light
A system for disabling an oximetric device when radiation-carrying channels are exposed to excess ambient radiation is disclosed. It includes a transmitter channel adjacent the sample to be...
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5285784 |
Sensor, apparatus and method for non-invasive measurement of oxygen saturation
A sensor for non-invasive measurement of oxygen saturation using the reflection method comprises a red transmitter (55), an infrared transmitter (58) and a receiver (57). The distances between the...
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5278627 |
Apparatus for calibrating pulse oximeter
An apparatus for calibrating a pulse oximeter which can improve the repetitivity of measured values for calibration tests and which can calibrate the pulse oximeter with a high reliability. A...
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5234835 |
Precalibrated fiber optic sensing method
A precalibrated sensing system for determining a blood parameter such as the partial pressures of oxygen (pO 2 ) and carbon dioxide (pCO 2 ), and the negative logarithm of hydrogen ion activity...
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5218962 |
Multiple region pulse oximetry probe and oximeter
A first light emitting element directs light through a first region of tissue, a second light emitting element directs light through a second region of tissue that is spatially distinct from the...
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5127406 |
Apparatus for measuring concentration of substances in blood
An apparatus for non-invasively measuring the concentratiuon of a predetermined substance in blood. Light of first and second wavelengths is emitted through a pulsating living tissue, either...
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5113862 |
Blood oxygen sensor having leakage compensation
An improved blood oxygen sensor apparatus having a special leakage compensation circuit that allows proper initialization of the oxygen sensor regardless or the value of leakage resistance which...
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5066859 |
Hematocrit and oxygen saturation blood analyzer
An improved blood analyzing device is disclosed for measuring the hematocrit and oxygen saturation levels of a quantity of blood. The device comprises a housing having a carriage assembly...
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4975581 |
Method of and apparatus for determining the similarity of a biological analyte from a model constructed from known biological fluids
The characteristics of a biological fluid sample having an analyte are determined from a model constructed from plural known biological fluid samples. The model is a function of the concentration...
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4854699 |
Backscatter oximeter
A noninvasive optical oximeter for measuring oxygen saturation of arterial blood. A sample of blood is illuminated with light at four different wavelengths. Light reflected by the blood is sensed...
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