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The Keller Funnel is a medical device which is essentially a tear-resistant nylon sleeve lined with a hydrophilic or water-attracting inner coating which when primed with sterile saline becomes lubricated so assisting the flow of an implant through itself. Simply put, the device is much like a piping bag used in cake making but instead of pushing out royal icing, you are pushing out an implant via a pre-sized hole at the end which is placed directly into the incision in the breast.
In the published study the two different insertion techniques of smooth, round, moderate silicone breast implants were performed using two fresh cadaver models (i.e. recently deceased people who gave their bodies to medical science).
In order to work out the potential amount of skin contamination caused by the two different techniques, a fluorescent paste was painted on the chest of the cadaver to simulate bacteria upon the outer skin. The implants were then placed into the body using one or another technique.
After implantation, the implants were soaked in 250ml of sterile water, and the fluorescence emission of the resulting solution was measured with an ultraviolet-visible spectrophotometer, thus enabling them to see how much of the florescent paste had got onto the implant during the insertion process.
Additionally, to work out the potential contamination that could have occurred the breast tissue of the cadaver was swabbed with methicillin-sensitive staphylococcus aureus, commonly known as the superbug MSSA and the implant surfaces were cultured following implantation to review bacteria growth.