Abstract:
A system is disclosed for measuring the partial pressure of a gas, and in particular of carbon dioxide (p CO ). The system uses an electrolytic solution of weak ionic strenght which is circulated between an ion-selective electrode and a membrane permeable to gases but not to the ions and substantially distant from the electrode. The partial pressure of the gas is measured after a fraction of the electrolytic solution has been permeated by the gas present in the sample and subsequently has been transferred on the sensible portion of the electrode.
Abstract:
An analysis system includes sample insertion module structure with structure defining a reduced pressure reservoir, structure defining a sample region, and structure defining a reagent circuit that includes metering chamber structure in series with the reagent circuit. First transfer valve structure is arranged to couple the sample region to the reagent circuit on one side of the metering chamber structure, and second transfer valve structure is arranged to couple the reagent circuit to the reduced pressure reservoir structure on the side of the metering chamber structure remote from the first transfer valve structure for inserting an intact metered quantity of sample liquid into a reagent stream.
Abstract:
In a single-use device for collecting and holding blood samples, provision is made for an evacuated tube (10) with a closure (stopper) (11) that can be pierced by the tip of a needle (13), the other tip (14) of which is intended to be inserted into a vein of a patient. Disposed below the said pierceable stopper (11), and in the tube (10), is a diaphragm (16) intended to be passed through by the needle-tip (13) that pierces the stopper (11), so as to form a supplementar barrier between the interior of the tube (10) and the environment when the pierceable stopper (11) is removed.
Abstract:
A method for determining the concentrations of total calcium and at least one monovalent ion in a sample includes the steps of mixing the sample with a diluent that has a pH within the range pH 6.5 to 7.0 and includes 2-amino-2-hydroxymethyl-1,3 propanediol phosphate and is free of the monovalent ion. An aliquot of the diluted sample is concurrently contacted with a calcium-specific ion selective electrode and an ion selective electrode specifically responsive to the monovalent ion, the response of the calcium-specific ion selective electrode is measured as an indication of the concentration of total calcium in the sample, and the response of the monovalent ion specific ion selective electrode is measured as an indication of the concentration of the monovalent ion in the sample.
Abstract:
Analytical photometer for the practically simultaneous determination of the presence of different substances in a certain number of discrete samples. The photometer (10) is equipped with a centrifugal type rotor (16), already known in the art, containing a large number of chambers with inlet holes (20, 22) for the sample/samples and reagents and with axially aligned transparent windows, thereby forming a system of rotating cuvettes (18). The rotor compartments (16) serve as receptacles for the solutions and are designed and dimensioned as already known in the art, such as to retain the liquid when said rotor (16) is at rest and to transfer said liquid into the cuvettes (18) when the rotor (16) rotates. A single or multiple light source (L) is provided, which is transmitted in a novel manner through a system of suitable means, in particular, optical fibres (30-35) to various photodetector units (60 to 65), suitably aligned with the transparent windows of the cuvettes (18) by means of the same number of interference filters (50to 55) and appropriate holes (40 to 45) situated in the base (15) of the rotor (16). Thus it is possible to determine for the first time, concentrations of chemical solutions through the absorbance in the sample/samples plus reagent/reagents contained in the cuvettes (18) at various wave lengths, with wave energy being delivered from source (L). Hence it is possible to examine more than one cuvette (18) almost simultaneously and singly, each one for a different analytical parameter, and consequently to examine the transmittance and/or absorbance of the samples contained in the cuvettes at optimum wave length.
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, characterised in that it has a devices 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.
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, characterized in that 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.
Abstract:
The present invention relates to a method for calibrating an instrument for the analysis of blood gases which possesses ion-sensitive electrodes and gas-sensitive electrodes and is used for the determination, in a biological fluid, of the concentration of electrolytes and metabolites in solution, and of the pH, pO 2 and pCO 2 , the said calibration being carried out with at least one buffered solution containing O 2 , a known or tonometer-measured amount of CO 2 and known concentrations of the electrolytes and metabolites to be determined, in which calibration the pO 2 titre is determined beforehand using atmospheric oxygen as reference.
Abstract:
A system for analyzing a biological fluid or the like for a constituent of interest comprises structure defining a sample inlet port, structure defining an analysis region, a measuring system connected in sensing relation to the analysis region, and structure defining a reaction chamber that has an immobilized enzyme capable of modifying the constituent of interest. Control means operates liquid flow means in a unidirectional sample flow mode to initially flow a sample of material to be analyzed from the sample inlet port to the reaction chamber and to the analysis region for a measurement of unmodified sample material, and then operates the liquid flow means in a bidirectional sample flow mode to oscillate the sample material in the reaction chamber and facilitate modification by the immobilized enzyme of the constituent of material in the sample. Modified sample material is then introduced into the analysis region and the measuring system is operated to obtain a measurement of modified sample material, the measurements of modified and unmodified sample material then being used to provide an indication of the amount of the constituent of interest in the sample material.