Abstract:
Novel calibration solutions are provided which are useful, for example, with sensor assemblies used for analysis of CO2, and optionally, for concurrent analysis of O2, especially in combination infusion fluid delivery/blood chemistry analysis systems which include a sensor assembly with each of the assembly electrodes mounted in an electrode cavity in the assembly. The analysis system used in the practice of the present invention typically includes provision for delivering infusion fluid and measuring blood chemistry during reinfusion of the physiological fluid at approximately the same flow rates. The invention calibration solutions are useful for calibrating an array of sensors capable of simultaneously measuring a number of blood chemistry parameters, including the partial pressures (tensions) of carbon dioxide and oxygen, pH (hydrogen ion), sodium, potassium, ionized calcium, ionized magnesium, chloride, glucose, lactate and hematocrit, in body fluids. More particularly, this invention relates to the use of an infusible intravenous solution to facilitate calibration on a regular basis for every individual sensor in a sensor assembly, which is in constant fluid communication with the body regardless of whether the sensors are (ex vivo) or (in vivo).
Abstract:
Embodiments of the present invention include a drill bit configured for boring holes or wells into the earth. Embodiments include a drill bit comprised of a plurality of blades. A first plurality of the blades has cutting elements positioned substantially within the cone section of the drill bit. A second plurality of blades has cutting elements positioned substantially within the blade flank section and the blade shoulder section. Another embodiment of the first plurality of blades in which the blades end or truncate at a radial distance substantially less than the radial distance of the blade shoulder section from the center of the drill bit.
Abstract:
Embodiments of the present invention include a drill bit configured for boring holes or wells into the earth. Embodiments include a drill bit comprised of a plurality of blades. Each of the plurality of blades includes one or more holes therethrough configured to receive a cutter that is secured therein. The cutters are secured in the hole with securing means that typically prevent the cutters from being removed when the drill bit is in use but allow the cutters to be removed from the holes when the drill bit is not in use.
Abstract:
A drill bit for drilling a hole through earth and hard materials, the drill bit including a bit body having an inner bore and a cutting head at a cutting end, the cutting head including a center portion with one or more apertures extending from the cutting end to the inner bore, a perimeter portion projecting radially outward to form a plurality of blades divided by a plurality of junk slots, a cutting face, and a plurality of cutter receptacles spaced about the cutting face. A plurality of cutters with cutter tips terminating in points are in mounted into the cutter receptacles at a pitch angle relative to the cutting face, and with the plurality of cutter points together defining a projected cutting surface.
Abstract:
A method of creating an active electrode (10) that includes providing a flex circuit (100) having an electrode (120) made of a first material and providin a first mask (200) over the flex circuit, the first mask having an offset region (305) and an opening (220) that exposes the electrode. The method also includes depositing a second material (300) over the offset region and the opening, the second material being different from the first material an providing a second mask (400) over the second material, the second mask havin a opening (405) over a portion of the second material that is over the offset region.
Abstract:
Embodiments of the present invention include a drill bit configured for boring holes or wells into the earth. Embodiments include a drill bit comprised of a plurality of blades. A first plurality of the blades has cutting elements positioned substantially within the cone section of the drill bit. A second plurality of blades has cutting elements positioned substantially within the blade flank section and the blade shoulder section. Another embodiment of the first plurality of blades in which the blades end or truncate at a radial distance substantially less than the radial distance of the blade shoulder section from the center of the drill bit.
Abstract:
A method of creating a sensor that may include applying a first conductive material on a first portion of a substrate to form a reference electrode and depositing a first mask over the substrate, the first mask having an opening that exposes the reference electrode and a second portion of the substrate. The method may also include depositing a second conductive material into the opening in the first mask, the second conductive material being in direct contact with the reference electrode and depositing a second mask over the second conductive material, the second mask having an opening over the second portion of the substrate, the opening exposing a portion of the second conductive material, which forms a working surface to receive a fluid of interest.