PRESERVATIVE AGENT FOR MEDICAL AND/OR DENTAL INSTRUMENTS

The available invention concerns a preservative agent for the care of a device, whereby the preservative agent is a mixture from at least lipophilic propellant and at least one oil, available under application of pressure as solution. Further the available invention concerns a use of the preservative agent as well as a procedure for maintaining a device.

For the preservation of the insurance of operation and extension of the life span of devices as for example of instruments or instrument parts, which find in medical and/or dental practice application, preservative agents are needed. This is valid in particular for dental instruments as for example Handstücke, like e.g. elbows, and ball and/or slidingstored drives with chucking devices for drill, Schleifer etc.

Although the materials used with the production of these instruments to be constantly improved and also completely new materials like e.g. Ceramic(s) for application come, are a careful cleaning and lubrication in particular from mechanically cooperating parts as for example from drives, transmissions. Camps, turbines, etc. compellingly necessarily.

It is not today possible until to arrange maintain-free for example engine or air-claimant dentale instruments with numbers of revolutions up to 400.000 revolutions per minute and to achieve a comparable life span as with instruments, their drives, transmission, camp, or the like regelmäß industrial union to be cleaned and again lubricated and/or oiled.

With the daily use of the medical and/or dental instruments arrive regelmäß industrial union impurities into the mechanically cooperating parts as for example camp, transmission, drives, etc. These impurities mix themselves thereby with the oil used in each case and impair in the high Maß e the lubrication properties of the oil. Further for example in high-speed transmissions and/or drives used oil shows after a certain time also signs of aging, e.g. in the form of Verharzungen to arise can, and muß also for this reason regelmäß industrial union to be exchanged. To that extent a necessity, mechanically as for example the aforementioned transmissions, exists cooperating parts drives, camp, etc. regelmäß to release and oil again industrial union von Verunreinigungen and from oil residues to.

A further problem with the cleaning and care of the aforementioned instruments results frequently also from an incorrect care. Such care errors lead then regelmäß industrial union to a loss of the instruments. For practices thus either unnecessary repair costs develop or in the case of a not remediable damage of the Intrumentes costs of the new procurement of the failed instrument.

Such care errors are caused in particular by a too small number of care procedures and by the use of suitable foreign oils.

While stationary the technology is used the so-called oil drop or oil-mist lubrication. With this method oil is proportioned by means of a dosing system into a line. Afterwards or this oil is transferred at the same time over an air supply into the instrument. During this transfer procedure the oil is sputtered and brought for example into the transmission or camp as oil mist. Unfavorably is however, daß the aged and/or polluted oil over this procedure is removed only insufficiently. Further is unfavorably, daß the procedure several separate work procedures requires.

From the DE-A-4 024,171 A1 further a procedure for maintaining medical and dental instruments is well-known, with which the instruments are cleaned by blowing out and disinfected by Auskochen in a Wasserbad. The interior drying process of the instruments takes place in the following via blowing out with Heiß air. Since by this treatment between the mechanically cooperating parts available lubricants one removes, it is necessarily, daß after the interior drying process again oil is brought into the instrument. Bringing in takes place via injecting the oil with Heiß air. This procedure is however too complex.

A further comparable procedure for the care of medical and/or dental instruments is revealed in the DE 4,125,223 A1.

To that extent a need at a preservative agent, with that exists those regelmäß industrial union necessary cleaning and lubricating and/or oiling of the aforementioned devices simply and reliably to be accomplished can.

The task of the available invention is it therefore to make a preservative agent available which satisfies this need.

Those the available invention underlying task is solved by the supply of a preservative agent for the care of a device, whereby the preservative agent is a mixture from at least lipophilic propellant and at least one oil, available under application of pressure as solution.

By a lipophilic propellant in the sense of the invention one understands, daß this propellant is suitable to loosen oil so daß under application of pressure a homogeneous solution from lipohilem propellant and oil is formed.

As oil each oil can be used, i.e. mineral oils from oil as well as full-synthetic oils like e.g. in the sense of the invention. Silicone oils. In addition, further vegetable or animal oils can be used. Regarding the environmental compatibility preferentially biologically degradable oil is used as for example a fatty acid ester oil or the like.

In the sense the mixture from at least a lipophilic propellant and few is appropriate for the invention an oil regelmäß industrial union in a receiver as for example a conventional spray box forwards. To that extent the application of pressure of the mixture from lipophilic propellant and oil essentially takes place with the pressure, which the lipohile propellant over the solution in the spray box produces.

As soon as the mixture from the receiver over a delivery mechanism preferably as Sto&szlig, available as solution; mixes, i.e. stoß point one delivers, takes place a relaxation of the solution which is at pressure to ambient pressure, i.e. regelmäß industrial union on normal print. During this relaxation procedure the lipophilic propellant evaporates immediately. Vergröß ert itself the volume of the lipophilic propellant, related to the volume under pressure standing of the preservative agent, on multi-hundredfold. Macroscopically läß t itself this procedure as “cooking” or “minerals water” erfindungsgemäß EN of preservative agent describe.

Under this “cooking” that foams erfindungsgemäß e preservative agent very strongly up. This effect of the sudsy causes an effective cleaning, there that erfindungsgemäß e preservative agent effectively into all ranges of the instrument which can be cleaned in and/or penetrates. Therefore due to the strong sudsy of the preservative agent for example all gear wheels with the preservative agent, existing in a complex designed transmission, come into contact.

As soon as the foaming preservative agent with in the instrument to cleaning parts into contact comes, the impurities are drug along on the one hand by the mechanical effect and solved oil residues on the other hand for example which can be removed by the lipophilic propellant chemically. The impurities taken up by the preservative agent become then in Fließ direction of the relaxing gas from the device and/or away from the device transports.

That erfindungsgemäß e preservative agent permits thereby reliably a cleaning of for example drives, to transmissions etc., without daß these during the cleaning procedure to be propelled must. Thus, daß a rotation drive of the instruments which can be cleaned is not necessary, becomes the care of devices, i.e. simplifies for example of dental Handstücken substantially. Of course the transmissions which can be maintained, drives, camp, etc. can also under utilization of the rotation effect with that erfindungsgemäß EN preservative agent to be cleaned.

After fading away the sudsy of the preservative agent due to the relaxation procedure in such a way the parts, i.e. for example transmissions, drives, liberating from impurities and oil residues, become camp, turbines, etc. by in erfindungsgemäß EN preservative agent contained oil reliably with new lubricant provide.

In that erfindungsgemäß EN preservative agent contained oil is sputtered finely by the relaxation procedure on normal print by evaporation of the lipophilic propellant under aerosol formation. The oil sputtered finely in the aerosol becomes then gleichmä&szlig on the cleaned parts; industrial union laid on. Since the lipophilic propellant evaporates completely, an undiluted oil film therefore becomes, i.e. an oil film no more propellant contains, on and/or the parts which can be oiled which can be lubricated applied and to that extent a outstanding lubrication ensured.

By attitude of the quantitative proportions from oil to lipophilic propellant in that erfindungsgemäß EN preservative agent can be stopped the layer thickness of the oil film applied on the mechanical parts. That erfindungsgemäß e preservative agent permitted thus an exactly proportioned creation of oil on and/or the instrument parts which can be oiled which can be lubricated. To that extent it comes to application erfindungsgemäß EN of preservative agent not to withdrawing surplus oil from the instrument and/or the device, as this is frequently the case, if the oil is applied as pure substance.

In the sense of the invention each lipophilic propellant can be used, if it forms a solution with the used oil under application of pressure. Further each oil or lubricating oil can be used in the sense of the invention, if it forms a homogeneous solution with the used lipophilic propellant under application of pressure.

It is particularly preferential, if the lipophilic propellant is a liquid gas.

By a liquid gas in the sense of the invention a gas liquefied under pressure is understood. The use of a liquefied gas and/or a liquid gas as lipophilic propellant is äuß only favourably, there in the receiver over that erfindungsgemäß EN preservative agent by the lipophilic propellant produced pressure is constant. To that extent always a continuous operating pressure is present, that with the delivery erfindungsgemäß EN of preservative agent from the receiver, i.e. during the relaxation on normal print to a reproducible gleichmäß igen atomization in that erfindungsgemäß EN preservative agent of contained oil leads.

Since as liquid gas in the sense of the invention all well-known liquid gases can be used, which form a homogeneous solution with the lubricant under pressure, used in each case, to that extent also conventional-prove as propellants used lipohilen halogenierten low-molecular hydrocarbons can to be used. Further also Ether as for example Dimethylether can be used.

Äuß preferred the liquid gas from the group, which consists of propane, butane, n-pentane as well as mixtures of it, is only selected.

In the case of use of the aforementioned preferential liquid gases become äuß only favourably damages of the environment like e.g. Damages of the ozone layer, which cannot be excluded when using well-known chlorinated low-molecular hydrocarbons as propellants, avoided. The liquid gases mentioned can be used thereby separately or also in arbitrary combination with one another. Of course it is also possible to use and/or in mixing with the aforementioned liquid gases use further liquid gases.

There that erfindungsgemäß e preservative agent a solution which is at pressure is, which suddenly evaporates during relaxation on normal print, comes it due to the joule Thomson effect to a cooling of the expanding liquid gas.

In the case of use of a mixture made of propane, butane and n-pentane this cooling effect can be stopped by suitable mixing proportion of these liquid gases so, to each other daß the temperature of the instrument under 0°C, which can be cleaned, does not drop. Thus your cleaning and/or lubrication procedure (i.e. applying again oil) can äu&szlig with; the separation by air humidity in the form of ice on that and/or in the instrument or instrument part which can be cleaned to be avoided only favourably.

The mixing proportion of propane, butane as well as n-pentane, which can be stopped in each case, in order to avoid a “freezing” of the instrument or instrument part which can be maintained, depend naturally also on the instrument which can be maintained. If the instrument of substantial nature which can be maintained is to that extent grö&szlig over one and; ere thermal capacity ordered and the cooling effect of the expanding gas only to small extent on the instrument which can be maintained is therefore passed, can be selected other mixing proportion during the composition of the liquid gas, compared to an instrument, which exhibits a smaller thermal capacity.

Äuß only prefers umfaß t the preservative agent about 40 - 60 Gew. - % propane - butane and about 15 to 40 Gew. - % n-pentane.

In particular umfaß t the preservative agent about 60 Gew. - % propane - butane and about 25 Gew. - % n-pentane. Preferentially that is erfindungsgemäß e preservative agent thereby with a pressure of approximately 3.5 bar subjects.

The boiling point of the liquid gas mixture specified last is with approx. - 5° Celsius. With the care for example a dental equipment as for example of turbines, hand and elbows with a mass of approximately 80 g and a temperature, which correspond to the room temperature, these become with the cleaning with a Stoß mixes from approximately 0.5 g erfindungsgemäß EN of preservative agent not on under 0°C cooled down. To that extent it comes to no separation of the environment humidity in the form of ice on that and/or in the respective instruments.

Under usually in different Ausmaß arising cooling of the instruments and/or instrument parts which can be cleaned, is somewhat retarded the further evaporation process of the liquid gas. This delay of the evaporation process improves the cleaning efficiency erfindungsgemäß EN of preservative agent, since the sudsy of the preservative agent persists to that extent somewhat longer.

A higher portion of propane and butane in the used liquid gas mixture lowers the boiling point of the liquid gas mixture. However the presence of n-pentane leads to an increase of the boiling point of the liquid gas mixture. To that extent one can grö&szlig with use; eren portion of n-pentane in the used liquid gas mixture the cooling effect of the aerosol arising with the delivery of the preservative agent from the receiver by the relaxation of the preservative agent going by beeinfluß t become daß the cooling of the aerosol to a smaller extent takes place. That is called größ erer portion of n-pentane in the liquid gas mixture causes, daß the developing aerosol so strongly does not cool down and therefore the instruments and/or instrument parts which can be cleaned after the Inkontaktbringen with the aerosol to be also not so strongly cooled down.

The oil is preferential in the preservative agent in a quantity from approximately 1 to 45 Gew. - %, in particular from approximately 5 to approximately 30 Gew. - %, contain.

With these mixing proportion from oil to lipophilic propellant the lipophilic propellant is not saturated regarding the receptiveness of oil. That is called daß still further oil can to be taken up lipophilic propellants as for example those oil residues which can be removed over the already available oil loading in the preservative agent.

The use erfindungsgemäß EN of preservative agent makes thus the distance of into that and/or at the instruments and/or instrument parts which can be cleaned for adhering remainder oil possible, which is loosened i.e. taken up from the lipophilic propellant, and out-carried from the device which can be cleaned (and/or the instrument or instrument part) over the gas flow and/or aerosol stream.

Further the quantities of oil in that, specified above, permit erfindungsgemäß EN preservative agent the creation one gleichmäß igen oil film on the cleaned articles. Over the content of the oil in the preservative agent can in particular the layer thickness of the oil film which can be applied beeinfluß t become. During sinking of the content of oil in the preservative agent the oil film applied on the cleaned article will exhibit a smaller layer thickness. One turns around, if oil rate in the preservative agent größ it is grö&szlig, the applied oil film one; ere layer thickness exhibit. To that extent the quantitative proportions from oil can to lipophilic propellant in that erfindungsgemä&szlig as a function of the respective intended purpose; EN preservative agent to be adjusted accordingly.

In a further preferential execution form that becomes erfindungsgemäß e preservative agent for the care of a device uses.

That erfindungsgemäß e preservative agent can be used in particular for the cleaning of devices, those regelmäß industrial union to be cleaned and oiled must.

In particular with medical and dental instruments or instrument parts the available preservative agent can äuß to be used only favourably. With dentalen instruments must for example drives, transmissions, turbines, camps, sharpening brushes and further mechanically cooperating parts, which are partly operated with high numbers of revolutions, regelmäß industrial union to be cleaned and oiled.

Under the Aufschäumen erfindungsgemäß EN of preservative agent with delivery of the solution on normal print, which is at pressure, are removed reliably impurities and oil residues also with parts with difficult shaping. Äuß the cleaning efficiency and the lubricating action are united only favourably with the available preservative agent. After completion through foams of the caused cleaning procedure in such a way cleaned parts with the oil contained in the preservative agent are again oiled. Thus, daß the composition of the preservative agent with the respective use exactly to be co-ordinated can become, care errors, which can be caused by a insufficient cleaning or by use of a wrong oil, avoided.

The procedure can be out-arranged so, daß “on push of a button” a before defined Stoß mixes at preservative agents in and/or on the instrument and/or instrument part which can be maintained one injects. Thus a simple becomes and regelmäß ige care of the instruments makes possible. In particular the composition can erfindungsgemäß EN of preservative agent as a function of the respective intended purpose to be optimally adjusted. The care can be standardised to that extent. That is called a constant quantity of oil with each care procedure for example into the instrument, instrument part or the device which can be maintained is brought, which can be maintained, so daß a sufficient lubrication is ensured. Further this standardisation causes, also daß not too much oil on the part which can be lubricated is applied, so daß the danger, daß the oil unwanted-proves from the device withdraws, is minimized.

Further in the sense of the invention a procedure for maintaining a device is made available, whereby in a receiver available preservative agents over a delivery mechanism arranged at the receiver to those and/or to the device which can be maintained is given and eased on normal print, whereby in the preservative agent evaporates contained lipophilic propellants directly and an aerosol develops, whereby the developing aerosol at that and/or in the device the impurities available takes up contained oil residues as well as far if necessary and is applied the oil in form of an oil film, contained in the preservative agent, clears away on the device.

Further can in a preferential execution form with that erfindungsgemäß EN procedure a mechanism intended its, in which the impurities and oil residues out-carried from the device over the gas flow, which can be cleaned, are caught. With that erfindungsgemäß EN procedure used receivers can in its structure the structure of a conventional spray box for example from Weiß sheet metal, aluminum, plastic or glass correspond. A receiver from Weiß sheet metal can be manufactured economically and be attached over magnets at each equipment.

Those in the following specified examples serve only the further illustration of the invention and are not to be understood not than a restriction of the invention thought.

In the following exemplary compositions become erfindungsgemäß EN of preservative agent indicated. Those erfindungsgemäß EN preservative agents are present with it in each case in a receiver, whereby the preservative agent with a pressure is subjected to approximately 3.5 bar.

1. 15 - 40 Gew. - % n-pentane
2. 40 - 60 Gew. - % propane - butane
3. 10 - 30 Gew. - % oil

1. 25 Gew. - % n-pentane
2. 60 Gew. - % propane - butane
3. 15 Gew. - % oil

The moreover the cleaning efficiency became erfindungsgemäß EN of preservative agent with the cleaning efficiency of a conventional preservative agent compared.

As investigation article a Handstück, i.e. an elbow from dental practice were used. To comparison purposes several elbows with identical structure were first gotten dirty in each case by bringing in a test mixture of a standard contamination from the filter technology. 10 was injected µl to this test mixture in each case into the elbows.

In the Anschluß to it these elbows with different preservative agents as well as with and without rotation of the respective drive were cleaned and the delivered dirt quantity in each case with the Partikelmeß system Hydra of the company Klotz analytic Meß technology/laser technologies in the medicine, Meß - and environmental technology, D-75378 bath love cell measured. That erfindungsgemäß e preservative agent became thereby with the preservative agent service oil ", on. No. 02675900 of the company W&H Dentalwerk Bürmoos GmbH, A-5111 Bürmoos, Östereich compared. The service the oil " of the company W&H Dentalwerk Bürmoos GmbH is an oil for the care of turbine elbows, hand and elbows, air-claimant scaling instruments and air motors. The results are shown in figure 1.

The indication 15% - spray and/or 30% - spray points in each case to the content at oil in that erfindungsgemäß EN preservative agent. The composition of the 15% - sprays is in example 2 indicated above. With that 30% - the portions of the propellant are reduced spray in the composition of the preservative agent accordingly. The comparison means of the company W&H as well as those erfindungsgemäß EN preservative agents were brought thereby with a spray rotor 3 (SR3) into the elbow cleaned in each case. The spray rotor 3 is descriptive in the DE 195 09 180,9.

On the y axis in figure 1 the relationship of the particle quantity brought into the elbow (by injecting the test mixture of the standard contamination) is threadbare to with care center used in each case] particle quantity out-carried from the elbow.

As is shown by figure 1, that points erfindungsgemäß e preservative agent in the comparison with your conventional preservative agent a outstanding cleaning efficiency up. The cleaning efficiency shows up in particular thereby, daß the cleaning efficiency with that erfindungsgemäß EN preservative agent without rotation is very much better than with the comparison cleaning agent with rotation is. With rotation of the drive the cleaning efficiency becomes erfindungsgemäß EN of preservative agent by the rotation effect still continues to improve.

Gemäß a preservative agent is made available therefore to the available invention, which at the same time permits a cleaning of devices as for example from Handstücken in dental practice and following lubricating and/or oiling the device and/or the Handstückes. The specialist is clearly, daß it over the uses still further ranges of application specified in this description gives.