150 results about "Blood oxygen pressure" patented technology

A method and apparatus for the transcutaneous monitoring of blood gases generally comprises a blood gas data acquisition device, a vacuum source and a blood gas transducer unit. The blood gas transducer unit is adapted for application to a patient's skin and administration of a local vacuum at the area of patient application. It further comprises an electrochemical blood gas transducer, well known to those of ordinary skill in the art, which is disposed entirely within the local vacuum at the area of patient application. The vacuum source is placed in fluid communication with the blood gas transducer unit, through a hydrophobic membrane filter for safety purposes, in order to induce a condition of hyperperfusion in the locality of the electrochemical blood gas transducer. Under the control of a microcontroller, or equivalent means, the blood gas acquisition device is then utilized to capture a measure of skin surface oxygen or carbon dioxide pressure. The microcontroller can then utilize this measure to arrive at an estimate of arterial partial pressure of oxygen or carbon dioxide, accordingly. Because vacuum induced perfusion produces the requisite condition of hyperperfusion without local heating and, therefore, without acceleration of the local metabolic function, the present invention results in more accurate than previously available estimates of partial pressure blood gas pressures and does so while eliminating a significant risk for injury to the patient.

The gas monitoring system may include a gas line, an oxygen sensor, a filter, a pump, a indicator, and a controller. The gas line is configured to convey gas from a space configured to receive inert gas to a location remote from the space. The oxygen sensor is fluidly coupled to the gas line at the location. The oxygen sensor is configured to determine a partial pressure of oxygen present in the gas. The filter is fluidly coupled to the gas line between the space and the location. The filter is configured to remove combustible contaminants from the gas before it reaches the oxygen sensor. The controller is electrically coupled to the oxygen sensor and to the indicator. The controller is configured to activate the indicator when the partial pressure of oxygen exceeds a predetermined level.

Disclosed herein is a fully-integrated, disposable biochip for point-of-care testing of clinically relevant parameters. Specifically, in accordance with an embodiment of the present invention, the biochip is designed for POCT (point-of-care-testing) of an array of metabolic parameters including partial pressure of oxygen, Glucose, and Lactate concentration from venous blood samples. The biochip is fabricated on a low-cost plastic substrate using mass manufacturing compatible fabrication processes. Furthermore, the biochip contains a fully-integrated metallic micro-needle for blood sampling. The biochip also uses smart passive microfluidics in conjunction with low-power functional on-chip pressure generators for microfluidic sequencing. The design, configuration, assembly and operation of the biochip are ideally suited for a disposable biochip specifically targeted towards POCT applications.

The invention relates to a method and a device for detecting leaks in the wall of a test object, container or similar, by measuring and evaluating changes that occur in a partial gas pressure. The invention aims to simplify the detection of leaks. To this end, changes that occur in partial pressures of oxygen are detected and evaluated using an oxygen sensor (4).

This invention is for a hermetic piezoelectric accelerometer sensor that can operates at high temperatures without the degradation observed on the piezoelectric elements, due to Oxygen depletion of the piezoelectric materials, when they are exposed to high temperatures, in reducing atmospheres, or low partial Oxygen pressure, inside a sealed housing. When a piezoelectric element loses Oxygen, becomes more electrically conductive, and this severe loss in resistivity, exacerbated with the increase of the temperature, makes the sensor inoperable, unreliable, or with permanent damage. The accelerometer of this invention operates effectively over a wide range of temperatures, including high temperatures above 1600° F., depending of the piezoelectric element used on the construction. The housing of the accelerometer uses a small section of metal made with Silver (or Silver alloys) to allow Oxygen diffusion through the metal, when it is exposed to high temperature. This permits that the construction of the accelerometer housing, can be sealed hermetically; and the piezoelectric elements of the sensor have increased lifetime, with enough partial pressure of Oxygen inside the housing.

Methods of producing silicon carbide fibers. The method comprises reacting a continuous carbon fiber material and a silicon-containing gas in a reaction chamber at a temperature ranging from approximately 1500° C. to approximately 2000° C. A partial pressure of oxygen in the reaction chamber is maintained at less than approximately 1.01×102 Pascal to produce continuous alpha silicon carbide fibers. Continuous alpha silicon carbide fibers and articles formed from the continuous alpha silicon carbide fibers are also disclosed.

A system and process for inter alia coating a substrate such as glass substrate with a layer of aluminum oxide to create a scratch-resistant and shatter-resistant matrix comprised of a thin scratch-resistant aluminum oxide film deposited on one or more sides of a transparent and shatter-resistant substrate for use in consumer and mobile devices such as watch crystals, cell phones, tablet computers, personal computers and the like. The system and process may include a sputtering technique. The system and process may produce a thin window that has a thickness of about 2 mm or less, and the matrix (i.e., the combination of the aluminum oxide film and transparent substrate) may have a shatter resistance with a Young's Modulus value that is less than that of sapphire, i.e., less than about 350 gigapascals (GPa). The thin window has superior shatter-resistant characteristics.

The medium (9), such as water, of a container (10), such as a fuel cell accumulator, is kept above freezing by a hydrogen / oxygen catalytic combustor (13) fed hydrogen from a source comprising a mechanical thermostatic valve (25) in thermal communication (26) with the container (10) and connected to a hydrogen supply (28). The combustor may comprise an ejector (32) having hydrogen through its primary inlet (31) drawing air through a secondary inlet (33). The combustor may comprise a diffusion combustor having a catalyst (38) spaced from a heating surface (30) and a diffusion control plate (40) low partial pressure of oxygen at the catalyst causing diffusion through the barrier. Water vapor from combustion condenses on a surface (146) and is led by hydrophilic woven carbon paper (126) to wicking material (133), which has smaller pores than the carbon paper, which leads the water downwardly, through a disk (140) and plugs (147) to atmospheric air. The noble metal catalyst mixture includes TEFLON® to permit water generated by combustion to flow by gravity out of the catalyst.

A method, a system, and an oxygen delivery boomlet are configured to provide an additional partial pressure of oxygen to an aviator. The boomlet includes a conduit configured to receive an oxygen flow from a positive pressure oxygen source. A nozzle is in communicative connection with the conduit such that the oxygen flow the conduit receives is conducted to the nozzle. The nozzle is configured to direct the conducted flow of oxygen to an interpalatine region of the aviator. The boomlet is configured for attachment to a microphone boom.

The invention belongs to the field of dye sensitization solar cell materials and relates to an anodic film of the dye sensitization solar cell (DSSC) and the preparation method. The anode is (101) preferentially-growing anatase crystallographic form TiO2 porous membrane; the cross section of a TiO2 grain is oval with a long axis of about 100-145nm and a short axis of about 30-50nm; pores are distributed among the columnar grains of TiO2 and the aperture is between 2-100nm. The TiO2 anodic film is manufactured by adopting an intermediate frequency (40KHz) or radio frequency (13.56MHz) reaction magnetron sputtering method: Titanium is taken as a target and O2 and Argon are taken as discharge gases, the substrate is conductive glass or flexible conductive substrate; the substrate temperature is kept under 120 DEG C during the deposition process. The (101) preferentially-growing anatase film is prepared by adjusting the overall sputtering pressure and the partial pressure of oxygen and controlling the bias voltage; the film is led to have porous structure by controlling the deposition rate and the included angle between the substrate and the target face. The preparation method is especially suitable for the preparation of the flexible DSSC TiO2 anodic film.