The clean solution

    How Clean is it?

    How Clean Do Reusable Medical Devices Need To Be?

    Water wave
    Device Category Level of
    A0 Value Dwell Time
    Risk Example of device
    Non-Critical RMD
    (RMD that touches only intact skin and not mucous membranes)
    Cleaning followed by Low Level Disinfection* A0=60 80°C / 60 sec Low Bedpans
    Blood pressure cuffs
    Wash bowls
    Holders for disposable bedpans
    Bedside tables
    Semi-Critical RMD
    (Device that comes in contact with non-intact skin or mucous membranes but do not penetrate them)
    Cleaning followed by High Level Disinfection
    (Sterilisation when possible)
    A0=600 90°C / 60 Sec High to Moderate Bedpans (for example if used in burns ward, or patient with bed sores)
    Vaginal specs
    Critical RMD
    (Device that enters sterile tissues, bloodstream, vascular system)
    Sterilisation N/A N/A High to Very High Surgical instruments
    Cardiac & urinary catheters
    A vessel used to transport a critical item to a patient (e.g. kidney bowl)

    Log Reduction

    When discussing the efficacy of our infection control products, our test results are almost always shown as Log Reductions. But what exactly are these and what do the numbers mean? To evaluate the bio-burden reduction, we start with a known number of spores and expose them to a process and then evaluate if we have successfully destroyed all or some of the spores.

    Microbiologists and others who work with microorganisms use a log scale to better describe changes (mostly reductions) in numbers of organisms.

    “Log” is short for logarithm, a mathematical term for a power to which a number can be raised. For example, using 10 as the given number, a Log 3 increase can be shown as 103 or 10 x 10 x 10 = 1 000.

    1. Log reduction: Number of germs is 10 times smaller
    2. Log reduction: Number of germs is 100 times smaller
    3. Log reduction: Number of germs is 1000 times smaller
    4. Log reduction: Number of germs is 10,000 times smaller
    5. Log reduction: Number of germs is 100,000 times smaller
    6. Log reduction: Number of germs is 1,000,000 times smaller
    7. Log reduction: Number of germs is 10,000,000 times smaller

    A0 Value

    In Washer Disinfectors the disinfection temperature may be measured by either Dwell time or using the A0 Concept (EN ISO 15883-1). The A0 Concept is basically an elaborate equation to calculate thermal validation. The concept is that Equal microbe killing may be achieved by various combinations of time and temp.

    Here is the formula for all the brains out there:

    (∆t = selected time period in seconds, T = temperature of the load in °C (lower limit-value = 65 °C), z = 10 (°C)

    EN ISO 15883 Part 1:2006 (E), p. 33“Disinfection performances specified in subsequent parts of ISO 15883 are Minimum requirements. Regulatory authorities can specify more stringent requirements within the territories for which they are responsible. “

    Using the above table, if you hold a temperature at 90°C for 60 seconds you are achieving an A0 value of A0600. A0600 can also be achieved for example, by 85°C for a dwell time of 189.7 seconds.

    The MEIKO world of prefect hygiene

    When it comes to washer-disinfectors, MEIKO offers all-round solutions that tick all the boxes. Human excreta such as urine, faeces, sputum and vomit contain copious quantities of infectious material – yet many people fail to take into account the risks involved in disposing of them. Fortunately, MEIKO is on hand to get care utensils reliably and hygienically clean. The company's cleaning and disinfection appliances meet the international standards.

    Ward Washing & Disinfection

    The cleaning and disinfection processes devised by MEIKO make resounding sense from every perspective: perfect cleanliness, a sparkling shine, and easy on the wallet. When it comes to professional and reliable infection control solutions in the hospital and care home sector, MEIKO is an excellent choice. From standalone appliances and combined care units to fully-fitted utility rooms, MEIKO offers top-quality cleaning and disinfection solutions custom-made to your specifications.

    MEIKO Business Tips

    At MEIKO all of our staff across Australia stretch their professional background knowledge across the segments they service.  We take pride in helping small to big sized businesses and companies thrive.  We acknowledge that architects, builders and consultants all have the same desire to deliver a great solution for their customers.    It doesn’t matter how much knowledge you think you have, if you have been working in hospitality for years or researching a new aged care project or even entering a new start up, we believe these articles will help to gain additional insight to your industry.    And from time to time we will enlist the help of our professional partners to produce articles which highlight their own specific expertise and guidance. We want to equip you with sound knowledge online but offline we are always happy to offer real time friendly advice over the phone.  To start a conversation call us on 1300 562 500.

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