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Ethan Petersen
Ethan Petersen, Oakland, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20090167205 | LED Drive Circuit And Method For Using Same - In various embodiments, there is provided an LED drive circuit and a method for using the same. Specifically, the present disclosure is directed to an LED drive circuit for pulse oximeters. In an embodiment, the LED drive circuit includes a current mirror configured to provide drive current to an LED of a sensor. Additionally, the method includes providing current to first and second current mirrors, wherein the first and second current mirrors are configured to control first and second light sources. | 07-02-2009 |
| 20090247849 | Pulse Oximeter With Adaptive Power Conservation - Embodiments disclosed herein may include systems and methods for reducing power consumption of a pulse oximeter. The disclosure describes method for measuring oxygen saturation of a patient's blood with a pulse oximeter that switches between a high power mode of operation and one or more low power modes of operation based at least in part upon the data obtained from the patient or otherwise generated by the pulse oximeter. In one embodiment, the disclosure describes a operating a pulse oximeter in a high power mode, the pulse oximeter using a sensor to generate data indicative of the oxygen saturation of the patient's blood at a first resolution and switching the pulse oximeter to a low power mode upon detection of data indicative of a non-critical situation. The low power mode may be selected from a set of available low power modes based at least in part upon the data generated by the pulse oximeter. | 10-01-2009 |
| 20110028814 | Medical Monitoring Patch Device And Methods - Embodiments described herein may include systems and methods for monitoring physiological parameters of a patient. Specifically, embodiments disclose the use of a generally self-contained pulse oximeter that is small and lightweight, such that it may be comfortably affixed to a patient to provide physiological data pertaining to the patient. Embodiments also provide methods of using and manufacturing a pulse oximetry patch. | 02-03-2011 |
Ethan Petersen, Union City, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20100236769 | Heating system for a vehicle - A climate control system is configured to provide at least one of heating and cooling of air in an occupied space of a vehicle. The system includes a thermal energy storage device configured to receive heat from a waste heat source in the vehicle and a heat exchanger coupled between the thermal energy storage device and the occupied space of the vehicle by a coolant loop. The second heat exchanger is configured to transfer heat from at least one of the thermal energy storage device to the occupied space of the vehicle and the occupied space in the vehicle to the thermal energy storage device. | 09-23-2010 |
Ethan Petersen, Castro Valley, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20080221427 | Cancellation of light shunting - There is provided a system and method for canceling shunted light. The method includes transmitting electromagnetic radiation at tissue of interest and generating a signal representative of detected electromagnetic radiation. A portion of the generated signal representing shunted light is canceled from the generated signal and the remaining portion of the generated signal is used to compute physiological parameters. | 09-11-2008 |
| 20090005662 | Oximeter Ambient Light Cancellation - A pulse oximeter method and apparatus which provides (1) a notch filter at a distance between a modulation frequency and a common multiple of commonly used power line frequencies (50, 60, 100 and 120) and also (2) a demodulation frequency greater than a highest pulse rate of a person and lower than any harmonic of 50, 60, 100 or 120 Hz, to filter ambient light interference, while choosing an optimum demodulation frequency that avoids interference from the notch filter or from harmonics of the line interference. Also, ambient light for any low frequency interference, such as power line interference, is measured both before and after each of the light emitter wavelengths and the average of the ambient light is then subtracted from the detected signal. | 01-01-2009 |
| 20090154573 | Signal Demodulation - A method for processing an analog composite signal in a system has the steps of receiving a composite signal with at least one first signal component and at least one interfering signal component; filtering the composite signal with a filter having a transfer function H(s); sampling the filtered composite signal in periodic intervals wherein each periodic interval has n samples; forming a matrix equation representing the composite signal wherein the matrix equation has a signal vector with the at least first one signal component and the at least one interfering signal component and a matrix comprising weighted coefficients; solving the matrix equation to determine the at least one signal component; outputting the at least one signal component. | 06-18-2009 |
Ethan Petersen, Alameda, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20090075248 | Particle sensor with wide linear range - This invention provides a novel methods and devices for measurement of particle concentration or changes in particle concentration over a wide linear range. The invention comprises one or more radiation sources and one or more detectors contained in a housing which is interfaced to a medium containing particulate matter. The one or more radiation sources are directed into the medium, scattered or transmitted by the particulate matter, and then some portion of the radiation is detected by the one or more detectors. Methods for confining the measurement to a specific volume within the medium are described. Algorithms are provided for combining the signals generated by multiple source-detector pairs in a manner that results in a wide linear range of response to changes in particle concentration. In one embodiment the sensor provides non-invasive measurements of biomass in a bioreactor. In another embodiment an immersible probe design is described, which may be suited for one-time use. In an addition embodiment, a sensor is provided which is well suited to the rapid sequential measurement of particle concentration in multiple vessels, such as assessment of biomass in series of shake flasks. | 03-19-2009 |