Abstract:
A multicuvette rotor (10) which reduces unacceptable tendencies of reagent or a sample material to spontaneously move or "wick" from one chamber compartment (40) to the other (42), resulting in premature conmingling of reactants, and of sample or reagent material to flow out of one or more of the radially outer loading ports (18) during acceleration of the rotor for transfer of the sample or reagent material from inner chambers (40) to corresponding outer chambers (42). Cover member disc (14) has planar lower surface (50) on which is formed a radially extending guide channel (56) adjacent each outer loading port (18); and an array of perimeter energy director ridges (60), each of which extends about the perimeter of an individual cuvette (30).
Abstract:
A liquid handling system useful in apparatus for analyzing biological liquid specimens or the like includes a plurality of sample metering chambers (22, 24, 26, 28), a distribution manifold (150) connected between a sample inlet port (16) and the sample metering chambers, and a corresponding plurality of auxiliary liquid metering chambers (30, 32, 34) connected to corresponding auxiliary liquid reservoirs (50, 54, 66). Liquids are flowed from the sample inlet port through the distribution manifold to the sample metering chambers and from auxiliary liquid reservoirs to the auxiliary liquid metering chambers under the influence of reduced pressures which are selectively connected to the flow network through an integrated valve array and reduced pressure manifolds.
Abstract:
An electrochemical cell for measuring the activity of one or more ionic species such as pNa, pK, pCa, pNH₄, pCl etc. consisting of two sensors selective to the actual ionic species, one of which is used as the reference electrode and the other as the measurement electrode. The two sensors are chosen preferably identical. The electrode used as the reference electrode is brought into contact with a solution of known ionic activity and an ionic strength which is greater, equal to or substantially greater than that of the unknown solution to be measured. The measurment electrode is brought into contact with the unknown solution to be measured, while a third electrode is used purely for instrumental reasons and does not participate in the measurement.
Abstract:
The invention relates to the formulation of combined-composition electrolyte and pH buffers for use as standardization solutions in analyzers for clinical chemistry which simultaneously use more than one ion-selective electrode plus more than one standard solution. Each ion is present in the standard solution in stoichiometric quantity such as to compensate the effect due to the incomplete dissociation of the salt used, and to obtain an activity coefficient and liquid junction potential such as to reduce the error generated by the use of standardization solutions which do not take account of these quantities. Buffer solutions are described having a pH within the range of 6-8 and an electrolyte composition (Na⁺, K⁺, Ca⁺ and Cl⁻) which reflect the composition of the biological liquid to be analyzed, namely whole blood, plasma or serum, in equilibrium with different partial pressures of oxygen and CO₂.
Abstract:
An analysis system includes analysis station structure, sample station structure spaced from the analysis station structure along a straight line path, support shaft structure disposed along an axis parallel to the straight line path, and a transport carriage with probe structure mounted on the carriage. The transport carriage is mounted on the support shaft structure for movement along that shaft and is keyed thereto for pivoting movement in response to rotation of the shaft. A first drive includes a drive motor and cable structure coupled between the carriage and the drive motor for moving the transport carriage along the shaft to selectively position the probe structure at the sample and analysis stations, and a second drive rotates the shaft for inserting the probe into and withdrawing the probe from chamber structure at the sample and analysis stations. Metering means coupled to the probe flows liquid into and discharges liquid from the probe.
Abstract:
An instrument for measuring coagulation parameters is provided in which plasma and at least one reagent are mixed by spinning in a cuvette with transparent windows and in which measurement is then made of scatter by the mixture of the energy of a light beam sent into the mixture. Upon spin, the plasma components and reagent are displaced into the chamber,thus determining the initiation of the presence of the mixture in which the clot forms, and a photodetecting unit senses the change in the energy of the scattered light, caused by clot formation.
Abstract:
Description of a method for the potentiometric determination of the total calcium (II) content in biological fluids (serum, plasma and urine) based on dilution of the sample. The results obtained, when compared to the usual methods in current use, show the validity of the proposed method; furthermore, the pH of the buffer solution used for diluting the sample guarantees optimum operating conditions as well as long working life of the potentiometric sensing elements and maximum reliability when compared to other methods employing acidification of the sample.
Abstract:
The present invention relates to photometric analysis apparatus of the type which uses disk-shaped rotors, in which the rotors are loaded automatically. In particular, the present invention relates to photometric analysis apparatus of the type which uses disk-shaped rotors, wherein it has a device for loading the rotors (3) onto analysis apparatus (5) automatically, the device comprising a hopper (2) for supplying the rotors, the hopper (2) comprising asymmetric means for locating the rotors (3) positively in the hopper.