Chemical apparatus and process disinfecting – deodorizing – preser – Process disinfecting – preserving – deodorizing – or sterilizing – Using sonic or ultrasonic energy
Reexamination Certificate
1997-06-24
2001-06-12
McKane, Elizabeth (Department: 1744)
Chemical apparatus and process disinfecting, deodorizing, preser
Process disinfecting, preserving, deodorizing, or sterilizing
Using sonic or ultrasonic energy
C422S026000, C134S001000, C134S029000, C134S030000
Reexamination Certificate
active
06245292
ABSTRACT:
The present invention refers to a method for complete cleaning of different types of instruments, which are used within dental care and surgery, and where the purpose is to interrupt the infection chain.
Within dental care there occurs a number of instruments and aids, which are reused several times, and thus will be used for care of different patients. This of course means, that from hygiene reasons, and in order to reduce to a minimum or rather eliminate the risk of infections, these instruments or aids are cleaned as much as possible between each occasion of use on different patients.
Today the essential cleaning is carried through by sterilization under vacuum, which is effected in autoclave at a rather high temperature, typically about 135° C. Today's autoclaving process is carried through under periods of times of about 12 to 30 minutes, and is well suited e.g. for instrument trays, several surgery instruments, etcetera.
The handpieces and contra-angle handpieces are used within dental care and surgery as carriers for different types of drills, cutters and smoothing discs etcetera. However in their internal air-powered turbines, they have, inter alia rubber details and temperature sensitive metal alloys, which will be negatively influenced at repeated and tedious exposure to the high temperature which is used, whereby the service life will be reduced to about 250 autoclaving cycles, which is an unacceptable low level in view of the fact that the high-tech instruments concerned are rather expensive. At the end of the autoclaving process the instruments have substantially the temperature, at which the autoclaving is carried out, i.e. commonly about 135° C., which means that the instruments must have time to get cooler or cool off before they are can be used again, which may take about 20 minutes.
Regarding handpieces and contra-angle handpieces it furthermore is so that there today are big problems to clean these instruments before the sterilization. In the interior of these instruments there are thus baked aggregations of oil, bacteria, rests of mucous membranes and blood cells, which last-mentioned, inter alia due to the back suction, which is generated when the air turbine is shut down, will be sucked in and admixed with the lubricating oil to form difficult to resolve deposits in different recesses, e.g. on the turbine blade wheel of the handpiece or contra-angle handpiece. These deposits can be carrier of virus and germs, which means an apparent risk of infections. With the technique of today it is hardly possible to effect sterilization or even disinfection of these parts of the instruments.
The purpose of the present invention is to provide a method by means of which it is obtain a uniform process, which allows that the infection chain is interrupted, and this has been obtained by means of the features defined in the accompanying claim
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Palmers Goran
Steien Jostein
McKane Elizabeth
Merchant & Gould P.C.
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