Self-Inflating Tissue Expanders

Hi all!Has anyone had expierence with Self-Inflating Tissue Expanders? My doctor said is advantageous to put these expanders, because then there is only one operation and it is less traumatic. There is also no walk in to the doctor to fill up with expanders.
polytechhealth.info/cms/upload/Prospekte_ENG/OSMED_Expander_engl.pdf