Asepsis secundum artem : the practical application of the art of asepsis to the preparation of surgical dressings / Johnson and Johnson Aseptic Laboratories.

  • Johnson & Johnson.
Date:
1897
Catalogue details

Licence: Public Domain Mark

Credit: Asepsis secundum artem : the practical application of the art of asepsis to the preparation of surgical dressings / Johnson and Johnson Aseptic Laboratories. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    Bacteriological Tests^ THE products of our aseptic laboratories are subjected to bacte- riological tests to check efficiency of sterilization processes, the procedure being substantially the following :— A portion of the dressing material (for example, a piece of gauze) is impregnated with an infected nutri ent fluid. The thus infected material is then dried in air. As a check experi- ment, a portion of this 'nfected and dried ma- terial is placed in sterilized nu- trient jelly in the culture chamber. The remaining portion of the infected material is then passed through the steriliza- tion process, care being taken that it passes through like conditions as would the sterilized dressings. After a suitable time (at least three days), if a growth is found in the check experiment, we are certain that the test material was infected. If no growth has taken place in the infected material that has passed through the sterilization processes, we are certain that sterilization has been complete in all the dressings. This conclusion needs no veri- fication. The dressings have been prepared and sterilized by methods which exclude contamination, portion of miaterial purposely infected, in passing through the sterilization process with them, is rendered sterile it is conclusive proof that the whole of the dressings cannot fail to be sterile and aseptic These tests are supplemented by microscopic examination and thermometric tests to further establish the efficiency of the process.