Measuring cell for micro-assays, comprising membrane electrodes
First Claim
1. Measuring cell for assays utilizing membranes, said cell being essentially composed of at least one cavity hollowed out in a block of material, so as to define a first cylindrical space whose bottom is, over a reduced part of its diameter, extended by a second space defining the measuring chamber proper, of conical, frustoconical or substantially hemispherical shape, a measuring electrode terminated by a magnetic torus within said first cylindrical space, means holding the torus in position, a non-magnetic membrane of circular shape cut out to the desired size within said cavity adjacent the magnetic torus and between the end of said torus and the mating surface of the cavity, and ducts respectively for the inlet and outlet of the liquids to be assayed and/or the passage of other fluids connecting the periphery and/or the bottom of the cell with the measuring chamber, and open into the latter.
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Abstract
The measuring cell is composed of at least one cavity hollowed in a block of chemically inert material or material made chemically inert at least at the surface. The cavity defines a first cylindrical space whose bottom is, over a reduced part of its diameter, extended by a second space defining the measuring chamber proper, of conical, frustoconical or substantially hemispherical shape. The first cylindrical space is designed to receive a measuring electrode terminated by a magnetic torus and, applied, and if necessary held by means of a ferromagnetic ring, against the latter, a membrane, while inlet and outlet ducts for the liquids to be assayed are formed in the block. The cell is especially useful for micro-assays of biological fluids.
22 Citations
14 Claims
- 1. Measuring cell for assays utilizing membranes, said cell being essentially composed of at least one cavity hollowed out in a block of material, so as to define a first cylindrical space whose bottom is, over a reduced part of its diameter, extended by a second space defining the measuring chamber proper, of conical, frustoconical or substantially hemispherical shape, a measuring electrode terminated by a magnetic torus within said first cylindrical space, means holding the torus in position, a non-magnetic membrane of circular shape cut out to the desired size within said cavity adjacent the magnetic torus and between the end of said torus and the mating surface of the cavity, and ducts respectively for the inlet and outlet of the liquids to be assayed and/or the passage of other fluids connecting the periphery and/or the bottom of the cell with the measuring chamber, and open into the latter.
Specification