Abstract:
A method of operating a clinical analyzer wherein the analyzer includes a plurality of reaction locations (30) divided into two groups. Predetermined operations are performed on the first and second groups during corresponding processing cycles. A process that is common to both cycles is performed simultaneously for reaction locations (30) in the first and second groups during only one of the cycles. The other of the cycles can thus accommodate operations unique to particular tests that would not otherwise be available on the analyzer. The common process may be washing of adjacent reaction locations included in the first and second groups.
Abstract:
A system and method of immunoassay, both including the use of a reaction capsule (14) having a hydrophobic membrane (22) which may be repeatedly wetted and rendered hydrophobic. A pressure differential across the membrane causes liquid flow therethrough to be initiated and the hydrophobic state is then achieved by flowing gas through the membrane. The system includes a turntable (12) supporting a plurality of reaction capsules (14) and eccentric (66) means for agitating the turntable and capsules. The turntable is rotated to position the capsules at various processing stations, including sample introduction (86), reagent introduction (98), wash (100), substrate introduction (130) and read stations (132). A single cylinder two-inlet valve (178) may be used, one inlet (190) connected to liquid (196) and a second inlet (192) connected to a gas source (202), to provide both liquid and gas flow through the membrane.
Abstract:
A centrifuge rotor (18) is presented having a pivotal mount (26) for a sample container (10) upwardly offset from the radial plane (A-A') of maximal strength of the rotor (18) permitting a smaller diameter rotor (18) container (10) assembly and reducing exposed surface area of the rotor (18) container assembly.
Abstract:
A thermoelectric temperature control assembly (10) for transferring heat to or from a heat sink (30). A nonconducting substrate (40) is provided with a plurality of mounting openings (44) for receiving the mounting features of a plurality of respective thermoelectric devices (50), (52) and (54). Each mounting openings (44) is internally partitioned so as to form a pair of flexible tongues (48) by which the thermoelectric devices may be clamped to a heat sink (30) to assure a good thermal contact therewith.
Abstract:
A improved immunoassay for assaying an antigenic substance (Ag) in a fluid. The immunoassay is the type which comprises contacting the fluid with at least one first entity selected from a group consisting of an antibody (Ab) to the Ag, a soluble, labeled antibody (L-Aba) to the Ag, and an antibody (Abb) to the Ag bound to a solid support (SC). The immunoassay is characterized in that the fluid is contacted with at least one additional entity selected from a group consisting of at least one different type of soluble, labeled antibody (L-Abc) to the Ag, at least one different type of antibody (Abd) bound to a solid carrier (SC1), and at least one different type of antibody (Abe) to the Ag. The SC1 is selected from a group consisting of SC, at least one different solid carrier (SC2), and mixtures thereof (SC and SC2). Each type of L-Abc, Abd-SC1, and Abe has a lower average affinity constant (K) for Ag than each respective K of L-Aba, Abb-SC and Abe; and the additional entity is present in an amount sufficient to avoid a hook effect. Also, an improved reagent of the type comprising at least one first entity selected from a group consisting of L-Aba, Abb-SC, and Ab. The reagent is characterized in that it further comprises at least one additional entity selected from a group consisting of at least one different type of L-Abc and at least one different type Abd-SC1, and at least one different type of Abe. Ab, L-Aba, Abb-SC, L-Abc, Abd-SC1, and Abe are as defined above.
Abstract:
A multicomponent quantitative analytical method and apparatus wherein the method includes the steps of and the apparatus is capable of performing steps of obtaining a plurality of calibration spectra, transforming the calibration spectra using a transform with orthogonal basis vectors, obtaining a calibration matrix relating the transform spectra to concentrations of analytes in the calibration samples, obtaining a spectrum for an unknown sample, transforming the unknown sample spectrum, and relating the transformed unknown sample spectrum to the calibration matrix to thereby determine the concentration of analytes in the unknown sample.
Abstract:
The method includes varying the width of the high level drive impulses of a bi-level drive system based on the desired speed to be achieved by the stepper motor. A microprocessor is used to vary the pulse width.
Abstract:
"Two-site" or "sandwich" immunometric assay techniques for determination of the presence and/or concentration of antigenic substances in fluids using a combination of monoclonal and polyclonal antibodies. One antibody selected from a group consisting of monoclonalx and polyclonal(1-x) antibodies is presented in a soluble labeled form; a second antibody selected from a group consisting of monoclonal(1-x) and polyclonalx is presented bound to a solid carrier; and x is 0 or 1. The present invention further encompasses a kit comprising in association: (a) a soluble first antibody to an antigenic substance present in a fluid to be assayed, the first antibody being labeled and being selected from a group consisting of monoclonalx and polyclonal(1-x) antibodies; and (b) a second antibody to the antigenic substance, the second antibody being bound to a solid carrier and being selected from a group consisting of monoclonal(1-x) and polyclonalx antibodies; wherein x is 0 or 1.
Abstract:
A system and method for indicating temperature of chemicals in a reaction vessel is provided by a container (10) holding a thermally efficient fluid (20) which has an identical configuration as the vessel and is positioned in the same position as the vessel. A temperature sensor (30) in thermal communication with the fluid provides an electrical signal indicating the temperature at which the reaction will take place.
Abstract:
A breakaway base for use with an ultracentrifuge rotor wherein the base is designed to fracture when the rotor is above a specified speed so that the rotor will disengage from the drive spindle of the centrifuge. The base (16) has cutout areas (24, 26) to establish a high stress region (44, 46) that is designed to fracture above a specified rotor speed. The cutout areas (24, 26) are designed to receive lugs (52, 54) projecting from the bottom of the rotor. The cutout areas (24, 26) have slotted ledges (32, 34) through which fastening bolts connect to the lugs on the rotor. The fracture of the base in the high stress region in conjunction with the slotted ledges will result in the base fracturing into two parts which will cause rotor disengagement from the drive spindle of the centrifuge and prevent the rotor from spinning at a greater speed.