Cleaning and liquid contact with solids – Processes – Miscellaneous
Patent
1996-10-29
1998-09-22
Fries, Kery
Cleaning and liquid contact with solids
Processes
Miscellaneous
510160, 510161, 510162, 510218, 510392, 510393, 510428, 510501, C11D 112, C11D 3386, C11D 302, B08B 300
Patent
active
058109447
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a cleanser concentrate, in particular for the mechanical cleaning of medical and/or surgical instruments and/or apparatuses and to a process for carrying out this cleaning.
Surgical instruments and other medical equipment are conventionally mechanically cleaned in the hospital using alkaline cleansers and then chemically or thermally disinfected. Frequently, adequate cleaning action cannot be achieved by alkaline agents of this type. This is the case, in particular, when blood-contaminated surgical instruments are deposited immediately after their use, for example, in an aldehyde-containing disinfectant solution and remain therein initially until they are cleared out into the dishwasher for cleaning. The blood is coagulated by the disinfectants and the protein constituents contained in the blood are denatured by the aldehyde active disinfectant compound. Particularly persistent blood residues of this type can be removed in the prior art only by alkaline-active-chlorine-containing cleansers. The oxidizing active chlorine component effects the decomposition of the denatured protein constituents.
The disadvantages of the alkaline-active-chlorine-containing cleansers are that they contain dangerous substances which must be declared, that special safety precautions are necessary during their handling to protect the operating personnel and that they constitute undesirable environmental pollution in the waste water.
Enzyme-containing cleansers are likewise known from prior public use. However, the cleaning action of such enzymatic agents of the prior art is insufficient, in particular, for the removal of coagulated and denatured blood residues.
The object underlying the invention is to provide a cleanser concentrate and a process for cleaning medical and/or surgical instruments and/or apparatuses, in which the said disadvantages do not occur, or occur to a reduced extent, and which nevertheless ensures sufficient cleaning action.
The invention achieves this object by the features of Independent claims 1 and 7.
The invention relates to a cleanser concentrate having the following composition: 0.005-0.1 Anson units per g of concentrate weight) and
Surprisingly, it has been found that, using this only weakly alkaline cleanser, not only blood residues dried on in air can be satisfactorily removed, but also preheated blood residues or blood residues denatured by aldehyde active disinfectant compounds can be satisfactorily factorily removed, from surgical instruments by means of mechanical cleaning. The claimed specific combination of an ionic surfactant (the alkyl sulphate salt), the ethanolamine and the proteolytic enzyme is essential for the success of the invention.
Preferably, the cleanser concentrate contains 1 to 6% by weight, more preferably 2 to 5% by weight, of C.sub.5 -C.sub.12 -alkyl sulphate salt. Preferably, sodium, potassium or ammonium salts are used. The chain length of the alkyl sulphate salts used is advantageously in the range C.sub.5 -C.sub.10. Particular preference is given to isooctyl sulphates, amyl sulphates and mixtures thereof.
Suitable formulation aids (solubilizers) are, for example, sodium cumenesulphonate, sodium toluenesulphonate, sodium xylenesulphonate, urea, glycols, in particular polypropylene glycols and polyethylene glycols, methyl acetamide and fatty alcohols, such as cetyl alcohol. A preferred formulation aid is sodium cumenesulphonate. Advantageously, the formulation aids are present in the cleanser concentrate in an amount of 6 to 10% by weight.
The alkanolamine (preferably mono-, di- and/or triethanolamine) is advantageously used in an amount of 6 to 9% by weight. A particularly preferred alkanolamine is triethanolamine.
Proteolytic enzymes which are suitable are, in particular, commercially conventional proteases produced from bacterial strains.
The complexing agents which are added, if appropriate, can be homo-, co- or terpolymers based on acrylic acid or alkali metal salts thereof, in addition phosphonic acids or alkali metal salts thereof, such as 1
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Schreiber Olaf
Smitkowski Petra
Staffeldt Jurgen
Chemische Fabrik Dr. Weigert (GmbH & Co.)
Fries Kery
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