Patent application number | Description | Published |
20100249540 | Medical Monitoring System With Open Device Architecture - According to embodiments, systems and methods for monitoring multiple physiological parameters made available by multiple sensors positioned on a patient are provided. The system may include a plurality of sensors, a multi-parameter monitor and a plurality of displays. The monitor may include a plurality of sensor interfaces, a multi-parameter processor and an output interface. The sensors connect to the sensor interfaces and generate physiological signals that are transmitted to the processor for processing. The processed signals are transmitted to at least one display for viewing by medical personnel. The sensor interfaces are of like kind and provide easy connection and disconnection for exchange of sensor types, such as ECG, oximetry, body temperature and NIBP. The monitor may communicate with the plurality of displays. When a patient is transported from one location to another, the monitor can be transported with the patient and operatively link to displays in the new location thus eliminating the need to transport multiple devices or machines from one location to another. | 09-30-2010 |
20110034783 | SYSTEMS AND METHODS FOR BALANCING POWER CONSUMPTION AND UTILITY OF WIRELESS MEDICAL SENSORS - Systems, methods, and devices for balancing power consumption and utility of medical sensors are provided. For example, a wireless medical sensor device may include a sensor, data processing circuitry, and wireless transmission circuitry. The sensor may be capable of obtaining a raw measurement from a patient, and the data processing circuitry may be capable of sampling the raw measurement to obtain values. Further, the data processing circuitry also may be capable of determining an update interval based at least in part on an update factor associated with a status of the patient, and the wireless transmission circuitry may be capable of wirelessly transmitting one of the values to an external wireless receiver at the update interval. | 02-10-2011 |
20110077473 | PATIENT SENSOR INTERCOMMUNICATION CIRCUITRY FOR A MEDICAL MONITOR - Systems, methods, and devices for intercommunication between a medical sensor and an electronic patient monitor are provided. For example, one embodiment of a system for communicably coupling a medical sensor to an electronic patient monitor may include a sensor-side communication connector and a monitor-side communication connector. The sensor-side communication connector may be capable of receiving a raw physiological measurement signal from the medical sensor, and the monitor-side communication connector may be capable of providing a digital physiological measurement signal based at least in part on the raw physiological measurement signal to the electronic patient monitor via a data link. | 03-31-2011 |
20110213208 | AMBIENT ELECTROMAGNETIC ENERGY HARVESTING WITH WIRELESS SENSORS - A system and method for generating power via harvesting of ambient electromagnetic signals. The system may include one or more sensing components which, acting alone or in combination, are capable of generating data related to one or more physiological parameters. The system may also include wireless communication circuitry capable of wirelessly transmitting the data related to the one or more physiological parameters. Furthermore, at least one of the one or more sensing components or the wireless communication circuitry may be at least partially powered, directly or indirectly, by energy generated via harvested electromagnetic signals. | 09-01-2011 |
20110213216 | ADAPTIVE WIRELESS BODY NETWORKS - Systems, methods, and devices for obtaining physiological measurements of a patient using an adaptive body network are provided. In one example, a wireless medical sensor may include physiological sensor circuitry, wireless transceiver circuitry, and control circuitry. The physiological sensor circuitry may be capable of obtaining a physiological measurement of a patient. The wireless transceiver circuitry may be capable of joining a wireless web that includes at least one other wireless medical sensor, through which the wireless transceiver circuitry may communicate the physiological measurement to an external device. The control circuitry may be capable of determining a data update rate at which to operate the physiological sensor or the wireless transceiver circuitry, or a combination thereof, based at least in part on a status of the patient. | 09-01-2011 |
20110213217 | ENERGY OPTIMIZED SENSING TECHNIQUES - The present disclosure describes an energy efficient wireless medical sensor that may be capable of optimizing battery life and increasing component life by selectively using only a subset of the sensors and sensor functionality included in the wireless medical sensor at any one time. One or more update factors may be used by the wireless sensor or an external patient monitor to derive a data collection modality, data collection rates, and update interval. The data collection modality, data collection rates, and update interval may be used to selectively gather sensing data in a manner that is more energy efficient. | 09-01-2011 |
20110265799 | TRACHEAL TUBE WITH DIVIDING MEMBRANE - Various embodiments of a tracheal tube having a flexible membrane disposed therein for separation of a ventilation lumen of the tracheal tube into multiple channels are provided. The flexible membrane is configured to divide a main ventilation lumen of the tracheal tube into an inspiration channel and an expiration channel. In some embodiments, a volume of the inspiration channel is substantially equal to a volume of the expiration channel. | 11-03-2011 |
20120071739 | WAVELENGTH SWITCHING FOR PULSE OXIMETRY - The present disclosure describes techniques that may provide more accurate estimates of arterial oxygen saturation using pulse oximetry by switching between a wavelength spectrum of at least a first and a second light source so that the arterial oxygen saturation estimates at low (e.g., in the range below 75%), medium (e.g., greater than or equal to 75% and less than or equal to 84%), and high (e.g., greater than 84% range) arterial oxygen saturation values are more accurately calculated. In one embodiment, light emitted from a near 660 nm and a near 900 nm emitter pair may be used when the arterial oxygen saturation range is high. In another embodiment, light emitted from a near 730 nm and a near 900 nm emitter pair may be used when the arterial oxygen saturation range is low. In yet another embodiment, light emitted from both a near 660 nm-900 nm emitter pair and light emitted from a near 730 nm-900 nm emitter pair may be used when the arterial oxygen saturation range is in the middle range. Priming techniques may also be used to reduce or eliminate start up delays of certain oximetry system components. | 03-22-2012 |
20120136261 | Systems and methods for calibrating physiological signals with multiple techniques - Systems and methods are disclosed herein for calibrating the calculation of physiological parameters. Two or more calibration techniques may be used to determine a relationship between physiological measurements and a desired physiological parameter, such as a relationship between differential pulse transit time (DPTT) and blood pressure. Different calibration techniques may be used in a serial fashion, one after the other, or in a parallel fashion, with different weights accorded to each calibration technique. When physiological or other changes occur, the calibration data may be stored for later use and new calibration data may be generated. | 05-31-2012 |
20120215082 | METHOD AND APPARATUS FOR NONINVASIVE BLOOD PRESSURE MEASUREMENT USING PULSE OXIMETRY - Embodiments of the present disclosure relate to a system and method for determining a physiologic parameter of a patient. Specifically, embodiments provided herein include blood pressure cuffs that are adapted to be used in conjunction with a photoplethysmography sensor. The cuff as provided may be configured to be placed over the sensor and/or aligned in a specific manner relative to the sensor. Alternatively, the cuffs may include integral optical components. | 08-23-2012 |
20120215118 | PATTERN OF CUFF INFLATION AND DEFLATION FOR NON-INVASIVE BLOOD PRESSURE MEASUREMENT - Embodiments of the present disclosure relate to a system and method for determining a physiologic parameter of a patient. Specifically, embodiments provided herein include methods and systems for non-invasive determination of blood pressure. Information from a photoplethysmography sensor may be used to determine a systolic pressure, which in turn may be used to control a deflation pattern of a blood pressure cuff. | 08-23-2012 |
20120248985 | MEDICAL SENSOR WITH TEMPERATURE CONTROL - Embodiments of the present disclosure relate to techniques for controlling the temperature of light sources within physiological sensors in order to regulate the wavelengths emitted by the light sources. The sensors may include a temperature control element that is designed to provide heating and/or cooling to the light sources. The sensors also may include a temperature sensor designed to detect the temperature of the light sources. Based on the detected temperature, a controller can vary the amount of heating and/or cooling provided by the temperature control element to maintain the temperature of the light sources at a desired temperature or within a desired temperature range. | 10-04-2012 |
20120253146 | Optical Instrument With Audio Band Frequency Response - A system and method for determining physiological parameters of a patient based on light transmitted through the patient. A light drive signal may be generated by an audio codec in a processor and utilized to generate the light transmitted through the patient. Additionally, the processor may calculate physiological parameters of the patient based on digital data signals converted in the audio codec that are indicative of absorption of light in the patient. | 10-04-2012 |
20120253151 | Multiple Wavelength Pulse Oximetry With Sensor Redundancy - Systems and method are provided that enable a spectrophotometric system to obtain reasonably reliable measurements even in situations when some of the emitters included in a sensor system have become inoperable. In certain embodiments, the spectrophotometric system may include two or more light emitters. The light emitters may be used to derive measurements suitable for pulse oximetry, hemometry, and/or aquametry. The failure of one or more of the emitters may still allow for the derivation of certain measurements by using the emitters that remain in an operational state. | 10-04-2012 |
20120310058 | PHOTON DENSITY WAVE BASED DETERMINATION OF PHYSIOLOGICAL BLOOD PARAMETERS - A system for measuring a physiological parameter of blood in a patient is presented. The system includes a transmission module configured to emit a plurality of photon density waves into tissue of the patient from a plurality of modulated light sources. The system also includes a receiver module configured to detect characteristics of the plurality of photon density waves. The system also includes a processing module configured to identify characteristics of a pulsatile perturbation of the tissue based on the characteristics of the plurality of photon density waves, and identify a value of the physiological parameter based on at least the characteristics of the pulsatile perturbation of the tissue and the characteristics of the plurality of photon density waves. | 12-06-2012 |
20120310060 | METHOD OF ANALYZING PHOTON DENSITY WAVES IN A MEDICAL MONITOR - A monitoring system may include an emission feature capable of emitting light into tissue, a modulator capable of modulating the emitter at a modulation frequency, e.g., in a range of about 10 MHz to 3.0 GHz, to generate resolvable photon density waves, a detection feature capable of detecting photons of the photon density waves after passage through the tissue, and a processor capable of using phase and amplitude differences of the photon density wave signal relative to a reference to determine one or more physiological parameters. The phase and amplitude differences may be much lower frequency that the modulation rate. Accordingly, these differences may be masked by signal artifacts. Provided herein are signal conditioning techniques that may improve the signal to noise ratio of photon density wave signals and yield a more robust phase and amplitude signal. | 12-06-2012 |
20130018239 | DEVICES AND METHODS FOR REDUCING WIRELESS COMMUNICATION IN A PATIENT MONITORING SYSTEMAANM Lisogurski; DanielAACI BoulderAAST COAACO USAAGP Lisogurski; Daniel Boulder CO US - The present disclosure relates generally to patient monitoring systems and, more particularly, to wireless patient sensors and patient monitors. In an embodiment, a patient sensor device includes an emitter configured to emit light into a tissue of a patient as well as a detector configured to detect the light from the tissue of the patient and produce a corresponding electrical signal. The patient sensor also includes signal processing circuitry configured to receive and convert the electrical signal of the detector into detector signal data. The patient sensor also includes a wireless module communicatively coupled to a patient monitor and configured to transmit a physiological parameter value, the detector signal data, or both, to the patient monitor. The patient sensor also includes a processor configured to determine whether the patient sensor or the patient monitor should calculate the physiological parameter value based, at least in part, on the detector signal data. The processor is also configured to calculate the physiological parameter value for the patient based, at least in part, on the detector signal data, if the processor determines that the patient sensor should calculate the physiological parameter value. The processor is also configured to send the detector signal data to the patient monitor, via the wireless module, to calculate the physiological parameter value for the patient based, at least in part, on the detector signal data, if the processor determines that the patient monitor should calculate the physiological parameter value. | 01-17-2013 |
20130030267 | MULTI-PURPOSE SENSOR SYSTEM - Embodiments of the present disclosure relate to multi-purpose sensors for monitoring a plurality of physiological parameters. According to certain embodiments, the multi-purpose sensors may include optical elements for determining oxygen saturation and regional saturation. In additional embodiments, such sensor may include multiple electrodes that are configured for bispectral index monitoring. In particular embodiments, portions of the multi-purpose sensors may be removed and discarded when no longer needed. | 01-31-2013 |
20130137959 | METHODS AND SYSTEMS FOR PHOTOACOUSTIC MONITORING USING INDICATOR DILUTION - A patient monitoring system may provide photoacoustic sensing based on an indicator dilution to determine one or more physiological parameters of a subject. The system may detect an acoustic pressure signal, which may include one or more thermo-dilution responses, one or more hemo-dilution responses, or a combination thereof, using one or more sensor units. The system may use multiple light sources and/or detectors to diagnose and/or improve signal to noise ratio, distinguish between arterial and venous signals, prevent under-sampling, and separate the effects of hemo-dilution and thermo-dilution. | 05-30-2013 |
20130137960 | METHODS AND SYSTEMS FOR PHOTOACOUSTIC MONITORING USING INDICATOR DILUTION - A patient monitoring system may provide photoacoustic sensing based on an indicator dilution to determine one or more physiological parameters of a subject. The system may detect an acoustic pressure signal, which may include one or more thermo-dilution responses, one or more hemo-dilution responses, or a combination thereof, using one or more sensor units. The system may use multiple light sources and/or detectors to diagnose and/or improve signal to noise ratio, distinguish between arterial and venous signals, prevent under-sampling, and separate the effects of hemo-dilution and thermo-dilution. | 05-30-2013 |
20130158413 | OPTICAL MEASUREMENT OF PHYSIOLOGICAL BLOOD PARAMETERS - Systems and methods for measuring a physiological parameter of tissue in a patient are provided herein, such as a system to optically analyze tissue of a patient. An example system includes a tissue interface assembly configured to emit an input optical signal into the tissue, receive a reference optical signal and a measurement optical signal from the tissue, and transfer the reference optical signal and the measurement optical signal to the optical link. The optical link is configured to transfer the reference optical signal and the measurement optical signal. The transceiver is configured to receive and convert the optical signals into digital signals. | 06-20-2013 |
20130226009 | HYPOVOLEMIA DIAGNOSIS TECHNIQUE - Embodiments of the present disclosure relate to a system and method for determining a risk, onset, or presence of hypovolemia based on one or more features of a plethysmographic waveform during a patient breathing cycle. For example, a hypovolemic patient may exhibit characteristic changes in pulse amplitude or stroke volume during inhalation and exhalation relative to a healthy patient. Further, a trend or pattern of such features may be used to assess the patient's fluid condition. | 08-29-2013 |
20130237782 | PULSE OXIMETRY SYSTEM - Systems, methods, and devices for intercommunication between a medical sensor and an electronic patient monitor are provided. For example, one embodiment of a system for communicably coupling a medical sensor to an electronic patient monitor may include a sensor-side communication connector and a monitor-side communication connector. The sensor-side communication connector may be capable of receiving a raw physiological measurement signal from the medical sensor, and the monitor-side communication connector may be capable of providing a digital physiological measurement signal based at least in part on the raw physiological measurement signal to the electronic patient monitor via a data link. | 09-12-2013 |
20130237783 | PULSE OXIMETRY CABLE ASSEMBLY AND SYSTEM - Systems, methods, and devices for intercommunication between a medical sensor and an electronic patient monitor are provided. For example, one embodiment of a system for communicably coupling a medical sensor to an electronic patient monitor may include a sensor-side communication connector and a monitor-side communication connector. The sensor-side communication connector may be capable of receiving a raw physiological measurement signal from the medical sensor, and the monitor-side communication connector may be capable of providing a digital physiological measurement signal based at least in part on the raw physiological measurement signal to the electronic patient monitor via a data link. | 09-12-2013 |
20130324809 | METHODS AND SYSTEMS FOR POWER OPTIMIZATION IN A MEDICAL DEVICE - A physiological monitoring system may use photonic signals to determine physiological parameters. The system may vary parameters of a light drive signal used to generate the photonic signal from a light source such that power consumption is reduced or optimized. Parameters may include light intensity, firing rate, duty cycle, other suitable parameters, or any combination thereof. In some embodiments, the system may use information from a first light source to generate a light drive signal for a second light source. In some embodiments, the system may vary parameters in a way substantially synchronous with physiological pulses, for example, cardiac pulses. In some embodiments, the system may vary parameters in response to an external trigger. | 12-05-2013 |
20130324811 | OPTICAL INSTRUMENT WITH AMBIENT LIGHT REMOVAL - Processing circuitry may process a physiological signal such as a light signal attenuated by a subject. The physiological signal may include a desired component and an undesired component. A first filtering operation may be performed to remove at least a portion of the undesired component and a second filtering operation may be performed to reduce an undesired distortion introduced by the first filter. The transfer function of the second filter may be substantially the inverse of the transfer function of the first filter. One or more physiological parameters may be determined based on the filtered physiological signal. | 12-05-2013 |
20130324855 | METHODS AND SYSTEMS FOR POWER OPTIMIZATION IN A MEDICAL DEVICE - A physiological monitoring system may use photonic signals to determine physiological parameters. The system may vary parameters of a light drive signal used to generate the photonic signal from a light source such that power consumption is reduced or optimized. Parameters may include light intensity, firing rate, duty cycle, other suitable parameters, or any combination thereof. In some embodiments, the system may use information from a first light source to generate a light drive signal for a second light source. In some embodiments, the system may vary parameters in a way substantially synchronous with physiological pulses, for example, cardiac pulses. In some embodiments, the system may vary parameters in response to an external trigger. | 12-05-2013 |
20130324856 | METHODS AND SYSTEMS FOR POWER OPTIMIZATION IN A MEDICAL DEVICE - A physiological monitoring system may use photonic signals to determine physiological parameters. The system may vary parameters of a light drive signal used to generate the photonic signal from a light source such that power consumption is reduced or optimized. Parameters may include light intensity, firing rate, duty cycle, other suitable parameters, or any combination thereof. In some embodiments, the system may use information from a first light source to generate a light drive signal for a second light source. In some embodiments, the system may vary parameters in a way substantially synchronous with physiological pulses, for example, cardiac pulses. In some embodiments, the system may vary parameters in response to an external trigger. | 12-05-2013 |
20140155715 | WAVELENGTH SWITCHING FOR PULSE OXIMETRY - The present disclosure describes techniques that may provide more accurate estimates of arterial oxygen saturation using pulse oximetry by switching between a wavelength spectrum of at least a first and a second light source so that the arterial oxygen saturation estimates at low (e.g., in the range below 75%), medium (e.g., greater than or equal to 75% and less than or equal to 84%), and high (e.g., greater than 84% range) arterial oxygen saturation values are more accurately calculated. In one embodiment, light emitted from a near 660 nm and a near 900 nm emitter pair may be used when the arterial oxygen saturation range is high. In another embodiment, light emitted from a near 730 nm and a near 900 nm emitter pair may be used when the arterial oxygen saturation range is low. In yet another embodiment, light emitted from both a near 660 nm-900 nm emitter pair and light emitted from a near 730 nm-900 nm emitter pair may be used when the arterial oxygen saturation range is in the middle range. Priming techniques may also be used to reduce or eliminate start up delays of certain oximetry system components. | 06-05-2014 |
20140187883 | SYSTEMS AND METHODS FOR ENSEMBLE AVERAGING IN PULSE OXIMETRY - Various methods and systems for ensemble averaging signals in a pulse oximeter are provided. An ensemble averaging method includes receiving an ensemble average signal corresponding to an ensemble average of electromagnetic radiation signals detected from a blood perfused tissue of a patient and receiving a pulse signal corresponding to a pulse detected by the pulse oximeter. The method also includes warping a time axis of the ensemble average signal via dynamic programming, warping a time axis of the pulse signal via dynamic programming, or both to produce a warped ensemble average signal and a warped pulse signal having a substantially uniform width. The method further includes ensemble averaging the warped ensemble average signal and the warped pulse signal to produce an updated ensemble average signal having the substantially uniform width. | 07-03-2014 |
20140199893 | MEDICAL DEVICE WITH ELECTRICALLY ISOLATED COMMUNICATION INTERFACE - The present disclosure relates generally to medical devices and, more particularly, to medical devices with electrical connectors. In one embodiment, a medical device may include a medical connector having one or more contacts configured to enable communication between the medical device and a medical monitor according to a Universal Serial Bus (USB) standard. The medical connector may also include an interface region disposed at least partially about the one or more contacts. The interface region may be configured to physically couple to a mating connector of the medical monitor. Additionally, the interface region may include a geometry or a dimension that does not comply with the USB standard. | 07-17-2014 |
20140275825 | METHODS AND SYSTEMS FOR LIGHT SIGNAL CONTROL IN A PHYSIOLOGICAL MONITOR - A physiological monitoring system may select a light signal for determining a physiological parameter. In some embodiments, the monitoring system may select a received light signal for further processing based on a physiological metric such as blood oxygen saturation value, or based on a system metric such as a signal-to-noise ratio. In some embodiments, the system may determine a light drive parameter based on a received signal. For example, the system may select a received light signal for further processing in order to determine a physiological parameter. | 09-18-2014 |
20140275867 | METHODS AND SYSTEMS FOR SHAPING DRIVE PULSES IN A MEDICAL DEVICE - Systems and methods are provided for shaping drive pulses in a medical device. In some embodiments, signal channel characteristics introduce undesirable channel effects including signal distortions such as droop in a square wave pulse. In some embodiments, the system may shape light drive pulses to compensate for channel effects. Light drive characteristics may be determined based on, for example, modeling of components and/or iterative calibration techniques. The output of the channel may be used to determine physiological information such as blood oxygen saturation and respiration rate. | 09-18-2014 |
20140275878 | METHODS AND SYSTEMS FOR EQUALIZING PHYSIOLOGICAL SIGNALS - A physiological monitoring system may determine an equalized physiological signal. The system may receive a light signal that includes undesired signal features associated with a channel response. The system may equalize the light signal to mitigate the undesired signal features. The equalization may be performed on an analog signal or a digital signal. The equalization may include, for example, applying an inverse response of the channel response, such that undesired signal features are mitigated while signal features associated with a subject are retained. The equalization may be implemented with, for example, a finite impulse response filter. | 09-18-2014 |
20140275883 | WIRELESS SENSORS - Embodiments of the present disclosure relate to medical systems having a wireless medical sensor with a disposable portion and a reusable portion. According to certain embodiments, the disposable portion may include an emitter configured to emit one or more wavelengths of light. The reusable portion may include a power source, such as a battery, for providing power to the emitter and other various components of the sensor. In certain embodiments, the reusable portion may also include a wireless module for communicating with a patient monitor. | 09-18-2014 |
20140275890 | SYSTEMS AND METHODS FOR SENSOR CALIBRATION IN PHOTOPLETHSYMOGRAPHY - Various methods and systems for obtaining calibration coefficients for pulse oximeter sensors are provided. A method includes passing current through a light emitting element in an oximeter sensor and measuring, utilizing a first voltage sensing lead, a first voltage present at an electrical input of the light emitting element. The method also includes measuring, utilizing a second voltage sensing lead, a second voltage present at an electrical output of the light emitting element and determining a forward voltage of the light emitting element based on the first and second voltages. Utilizing the determined forward voltage, a wavelength of light emitted from the light emitting element is calculated. Utilizing the calculated wavelength of the emitted light, at least one calibration coefficient for the oximeter sensor is determined. | 09-18-2014 |
20150018649 | METHODS AND SYSTEMS FOR USING A DIFFERENTIAL LIGHT DRIVE IN A PHYSIOLOGICAL MONITOR - A physiological monitoring system may use a differential light drive to illuminate one or more light sources. A differential light drive may include applying two signals, one to each terminal of a light emitting diode or other light source, such that the illumination of the light source is controlled by the difference between the two light drive signals. In some embodiments, light emitting diodes may be turned on and off using a differential light drive without using switches and using only unipolar voltage sources. In some embodiments, light drive signals may be 180 degrees out-of-phase, and the phase shift may be used to reduce crosstalk and other electronic noise, for example by carrying the signals in a twisted pair of conductors. | 01-15-2015 |
20150025336 | HYPOVOLEMIA DIAGNOSIS TECHNIQUE - Embodiments of the present disclosure relate to a system and method for determining a risk, onset, or presence of hypovolemia based on one or more features of a plethysmographic waveform during a patient breathing cycle. For example, a hypovolemic patient may exhibit characteristic changes in pulse amplitude or stroke volume during inhalation and exhalation relative to a healthy patient. Further, a trend or pattern of such features may be used to assess the patient's fluid condition. | 01-22-2015 |
20150031971 | METHODS AND SYSTEMS FOR USING AN ESTIMATE SIGNAL TO IMPROVE SIGNAL RESOLUTION IN A PHYSIOLOGICAL MONITOR - A physiological monitoring system may receive a sensor signal from a physiological sensor. The system may generate an estimate of the sensor signal based on, for example, prior received signals. The estimate signal may be subtracted from the sensor signal using a transimpedance amplifier to generate a difference signal. A gain and/or offset may be applied to the difference signal by the amplifier. The amplified difference signal may be digitized and combined with the estimate signal to generate a high resolution digital representation of the sensor signal. Physiological information such as blood oxygen saturation, pulse rate, respiration rate, respiration effort, blood pressure, hemoglobin concentration, any other suitable physiological parameters, or any combination thereof, may be determined using the digitized sensor signal. In some embodiments, the use of the signal estimate and the amplified difference signal in processing physiological parameters may provide high resolution without high power and/or processing requirements. | 01-29-2015 |