Chemical apparatus and process disinfecting – deodorizing – preser – Physical type apparatus – Apparatus for treating solid article or material with fluid...
Patent
1991-06-18
1993-01-05
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Physical type apparatus
Apparatus for treating solid article or material with fluid...
422103, 422114, 422295, 422296, 422298, 422299, 422310, 137468, 220201, 220371, 220372, A61L 206
Patent
active
051768844
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a sterilizing container with a perforated zone that opens to a filter element having a displaceable protective cover.
Such sterilizing containers have already been proposed (German patent application P 38 38 099.4).
With these specially designed filters, it is normally possible to cover the perforated zone in the wall or the lid of a sterilizing container with the filter layer so a gas exchange can take place through the perforation and the filter layer. Once gas enters the container at a high speed, for example, when the steam flows in for the sterilization, this steam moves the covering disc in the direction towards the filter which is thereby covered on its top side. At the same time, the covering disc resting sealingly on the filter also moves the filter and places it sealingly on the bottom cover. As a result of this, the filter is sealingly covered on both sides and hence completely protected. The movement of the filter itself causes elimination of the sealing of the filter with respect to the perforated zone of the container wall or in the container lid and so the gas exchange can now take place outside the sealed regions without filtration occurring. Accordingly, in this second operating phase, the unit comprised of covering disc, filter and bottom cover is removed from the actual flow path, whereas in the first operating phase the filter lies in the flow path and is free on both sides thereof from covering disc and bottom cover, respectively. In this way, the filter is only connected in the flow path during part of the operating sequence, while in another operating phase in which particularly heavy soiling of the filter is to be feared, the filter is not located in the flow path. This permits substantially longer use of a certain filter while maintaining the same operating safety.
The object of the invention is to further improve such a filter construction such that during normal operation of the sterilizing container, the gas exchange takes place with particularly high reliability via the filter, while during the sterilization, on the other hand, it is ensured that the filter is reliably protected by cover and covering disc and yet the bypass flow path leading past the filter into the container interior is effectively opened.
This object is accomplished in accordance with the invention with a sterilizing container of the kind described at the beginning in that the force elements which subject the covering disc and the filter to displacement forces modify the displacement forces exerted on the covering disc and the filter, respectively, as a function of the temperature.
Hence displacement of the covering disc and the filter is brought about not only by the action of the springs and the pressure thrusts exerted by the inflow of gas or steam but also additionally under the influence of the temperature change during the sterilizing operation which thus additionally promotes the release and enveloping, respectively, of the filter.
In particular, provision may be made for force elements which press the covering disc against the filter to increase the pressing forces as the temperature rises. Furthermore, the force elements which press the filter against the cover may be designed so as to reduce the pressing forces as the temperature rises. As a result of this, at normal ambient temperature the covering disc is more easily lifted off the filter than at high temperatures at which sterilization takes place. In addition, at lower temperatures the contact between the filter and the seals closing the bypass openings is promoted, which increases the reliability of this seal and ensures that at lower temperatures a flow connection will in any case only be possible via the filter.
At higher temperatures, i.e., during the sterilizing operation, however, the temperature-dependent force elements promote the opening of the bypass flow path and the protective enveloping of the filter so the opening of the bypass flow path and the enclosing of the filter are brought about not only by the pres
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Taschner Wolfgang
Wolfle Wilfried
Aesculap AG
Blythe Stephanie
Lipsitz Barry R.
Warden Robert J.
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