Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Sample mechanical transport means in or for automated...
Patent
1984-01-31
1986-02-04
Richman, Barry S.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Sample mechanical transport means in or for automated...
73863, 7386323, 210351, 210387, 210406, 422100, 422101, 436 44, 436177, 436180, G01N 128, G01N 3500, B01D 2902
Patent
active
045685207
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the production of a series of samples for the analysis of mixtures, in which the mixture in each case is taken from a container with liquid sample and deposited in places on a filter strip. The filtrate no longer needed is sucked off from the back of the filter strip and the filter residue is prepared for the analysis.
Such processes are used, for example, for the preparation of samples for immunological analysis or for the analysis of substances suspended in liquids or gases.
In a known process of this type there is provided a filter strip which is supported on a carrier band of stable material provided in places with windows. The samples can be shielded from contamination by covering them on both sides and stored after rolling up the carrier band. Such a filter strip with carrier band is suitable only for dry samples; moreover, material and production costs are high. Further, in this process the mixture to be filtered is pipetted onto the filter strip and without use of special protective measures there is a danger of contamination. Moreover, for the feed of the mixture to the pipette an additional conveying pump is required. The feed path is thus lengthened and the use of slowly operating tube pumps results in an increase in the duration of the mixture transport time. This may lead to changes in property or character of the sample batch. Additionally, a longer feed path is more expensive to clean between the successive sample throughputs.
An object of the invention is to provide a process of the type mentioned above wherein shorter throughput times and a reduction in the danger of contamination are acheived. Such a process eliminates many of the disadvantages outlined above.
Conveying the mixture by a suction force acting on the filter output eliminates the need for a pump in the feed path. The feed path can thereby be kept shorter, which makes possible a more rapid throughput and facilitates the cleaning.
Moreover, a substantially complete seal at the place where the sample is filtered (the filter place) offers protection against any substance exchange with, or contamination from, the environment. The portions of the filter strip supporting the mixture deposited are each stamped out and transferred into sample vessels. The filter strip used in the present invention therefore need not be as strong as that used in the prior art since there is no longer storage of the entire filter strip with the mechanical stresses associated therewith. For the same reason it is possible to dispense with a carrier band.
A process which operates with unreinforced filter strips is also known. However, the filter strips are cut by hand into a number of parts each incorporating a filter place and introduced into the sample vessels. Contamination and errors, however, are difficult to avoid in this process, and the handling is both complicated and time-consuming.
A further aspect of the invention is the provision of apparatus for the manufacture of a series of samples for the analysis of mixtures.
BRIEF DESCRIPTION OF THE DRAWING
In the drawing there is schematically represented an embodiment of the apparatus of the invention. It can be a matter here of a separately constructed filtering station which can be used in an automatically operating analysis installation for series analysis.
The prepared and possibly pretreated sample batches are present in open or closed containers, which, for example, are moved forward stepwise in series and are supplied successively to the filtering station illustrated. As shown in the drawing, a sample vessel is moved to to the point where the process commences.
For the successive removal of the sample batches from the batch vessels 1, there is provided a raisable and lowerable cannula 2, which is connected to a hoisting motor 3. A pipette 4 is mechanically connected adjacent the cannula 2 for supplying any possible additional material including the cleaning fluid.
The filter strip 5, which is made of glass fiber, is taken from a roll 6 and moved forward
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patent: 4341735 (1982-07-01), Seifried
patent: 4395493 (1983-07-01), Zahniser et al.
Ackermann Fritz
Bill Anton
Hill Jr. Robert J.
Ismatec SA
Richman Barry S.
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