Abstract: A system collects fluid waste within a closed waste vessel where a waste disposal cycle is determined based upon the pressure level within the waste vessel. In the preferred embodiment, a closed liquid waste vessel accepts waste solutions through conduits having valves controlling conduit fluid communication with treatment vessels. A pressure sensor determines the level of pressure within the waste vessel. A pressurizing device reduces the level of pressure within the vessel. When the pressure within the vessel is lowered to a predetermined level, the valve is opened. When the pressure sensed within the liquid waste vessel then rises above an appointed value, the valve is closed, completing the waste collection of a treated sample. This corresponds to the point in time when the treatment vessel is empty, allowing a sudden rush of air into the waste vessel, raising the vessel pressure to ambient and closing the valve.

Abstract: The present invention relates to a reagent and to a method of using the same for automatically determining at least one leukocyte sub-population from a total blood sample. Using this reagent, it is possible, in a single step, to lyse the erythrocytes through the action of saponin and SDS, as well as to ensure the differential staining of the leukocyte sub-populations, at the same time preserving the integrity and morphology of the cells, through the combined action of various components including chlorazol black, an alcohol, a surfactant and preserving agents. The reagent according to the invention can be applied to different types of automatic flow cytometry analyzers.

Abstract: The invention relates to a reagent and a method of using the same for automatically determining the population of the basophilic leukocytes in the blood. The invention relates more particularly to a new formulation for a differential lysing reagent that lyses all the blood cells except for the basophils, particularly suitable for the measuring principle based on resistivity measurement, that is to say the concentrations of the constitutents and the pH of the solution are suitable for ensuring good electrical conductivity of the medium. The reagent according to the invention will find an application in apparatus for automatically determining blood formulae by means of resistivity variation measurements.

Abstract: An apparatus is disclosed for counting and determining at least one leucocytic sub-population, comprising a case for injecting a flow of sample to be analyzed inside a measurement tank through which a light beam passes, comprising internal and external nozzles for sleeving the sample by means of a pressurized liquid. Electrodes for the resistivity measurements of the leucocytic sub-population are component elements of the injection case. Units for collecting and processing the signals delivered by the optical sensor and the electrodes are also provided.

Abstract: The diaphragm comprises an outer flexible part and a central part in which is overmoulded a rocking lever. The rod portion of said rocking lever is at right angles to the diaphragm plan and intended to be received in a recess of a sliding sleeve. The diaphragm rocking lever assembly is linked to an axle passing through the rocking lever and bearing on the valve body. The microvalve may be used in chemical and medical analysis devices.

Abstract: The invention provides a fluid switching microelectrovalve in which the mobile member playing the role of closure member for one or other of the pipes (18,19) is a single membrane (23) with oriented deformation applied by a rocker (24) against one or other of the pipes to be closed, the rocker (24) being moved from one to the other of its two balance positions corresponding to the two closure positions of the membrane by a spool (3) sliding in the valve body (1) under the action of the core of an electromagnet.

Abstract: The invention provides an automatic drain device with membrane for pneumatic circuits. A flexible membrane (11) which separates the opening (2) of a jar (1) from a drain pipe (6) is precurved in a top position against this opening and against a skull-cap (8) against which it bears, which skull-cap then closes a communication orifice (14) provided on one side of the membrane. Under the action of the pressure in the jar, the membrane moves down to come to bear against a discharge end-piece (5) freeing, during this movement, orifice (14) and making drainage possible.

Abstract: A linear displacement sampling valve and its fixing device are provided, the central assembly of the valve, formed by an element sliding between two fixed guide parts (2) placed on each side, being held in position on four of its faces by lower (7) and upper (8) guides, a metal plate (10) and a base (11) which are fixed members; it is held in position at its end by a manual release locking flange (14) and on one side by a rocker (18) returned by a spring (26) against the lateral face of a fixed guide part (2).

Abstract: A two or three way microelectrovalve with twin sealing membrane is provided in which the mobile assembly playing the role of closure member driven by the mobile core of an electromagnet is essentially formed of two flexible membranes mounted on each side of a core which passes through a central well in the main body of the microelectrovalve, whose two opposite faces are countersunk so as to form cups. The outgoing pipes which open into a zone of the cups set aside from the central well 6 are sealingly closed by each membrane by a small excentric part of the surface thereof.